Form 485BPOS

As filed with the U.S. Securities and Exchange Commission on February 28, 2022

File Nos. 333‑179904 and 811‑22649

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A


		REGISTRATION STATEMENT
		UNDER
		THE SECURITIES ACT OF 1933		☒
		Post-Effective Amendment No. 623		☒
		and/or
		REGISTRATION STATEMENT
		UNDER
		THE INVESTMENT COMPANY ACT OF 1940		☒
		Amendment No. 623		☒
		(Check appropriate box or boxes)

iShares U.S. ETF Trust

(Exact Name of Registrant as Specified in Charter)

c/o BlackRock Fund Advisors

60 State Street

Boston, MA 02109

(Address of Principal Executive Office)(Zip Code)

Registrant’s Telephone Number, including Area Code: (415) 670‑2000

The Corporation Trust Company

1209 Orange Street

Wilmington, DE 19801

(Name and Address of Agent for Service)

With Copies to:


MARGERY K. NEALE, ESQ.		DEEPA DAMRE SMITH, ESQ.
WILLKIE FARR & GALLAGHER LLP		BLACKROCK FUND ADVISORS
787 SEVENTH AVENUE		400 HOWARD STREET
NEW YORK, NY 10019-6099		SAN FRANCISCO, CA 94105

It is proposed that this filing will become effective (check appropriate box):

☐	Immediately upon filing pursuant to paragraph (b)

☒	On March 1, 2022 pursuant to paragraph (b)

☐	60 days after filing pursuant to paragraph (a)(1)

☐	On (date) pursuant to paragraph (a)(1)

☐	75 days after filing pursuant to paragraph (a)(2)

☐	On (date) pursuant to paragraph (a)(2)

If appropriate, check the following box:

☐	The post-effective amendment designates a new effective date for a previously filed post-effective amendment

	March 1, 2022

2022 Prospectus

iShares U.S. ETF Trust

•	iShares Bloomberg Roll Select Commodity Strategy ETF \| CMDY \| NYSE ARCA

The Securities and Exchange Commission (“SEC”) and Commodity Futures Trading Commission (“CFTC”) have not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

Table of Contents

Fund Overview	S-1
More Information About the Fund	1
A Further Discussion of Principal Risks	2
A Further Discussion of Other Risks	19
Portfolio Holdings Information	21
Management	21
Shareholder Information	25
Distribution	33
Financial Highlights	34
Disclaimers	35

Bloomberg Index Services Limited and its affiliates (collectively, “Bloomberg”) are not affiliated with BlackRock Fund Advisors or its affiliates and do not approve, endorse, review, or recommend the iShares Bloomberg Roll Select Commodity Strategy ETF. Bloomberg and the Bloomberg Roll Select Commodity Total Return Index are trademarks or service marks of Bloomberg and have been licensed to BlackRock Fund Advisors or its affiliates. Bloomberg does not guarantee the timeliness, accurateness, or completeness of any data or information relating to the Bloomberg Roll Select Commodity Total Return Index and shall not be liable in any way to the BlackRock Fund Advisors or its affiliates, investors in iShares Bloomberg Roll Select Commodity Strategy ETF or other third parties in respect of the use or accuracy of the Bloomberg Roll Select Commodity Total Return Index or any data included therein.

iShares^® and BlackRock^® are registered trademarks of BlackRock Fund Advisors and its affiliates.

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

iSHARES^® BLOOMBERG ROLL SELECT COMMODITY STRATEGY ETF

Ticker: CMDY

Stock Exchange: NYSE Arca

Investment Objective

The iShares Bloomberg Roll Select Commodity Strategy ETF (the “Fund”) seeks to track the investment results of an index composed of a broad range of commodity exposures with enhanced roll selection, on a total return basis.

Fees and Expenses

The following table describes the fees and expenses that you will incur if you buy, hold and sell shares of the Fund. The investment advisory agreement between iShares U.S. ETF Trust (the “Trust”) and BlackRock Fund Advisors (“BFA”) (the “Investment Advisory Agreement”) provides that BFA will pay all operating expenses of the Fund, except: (i) the management fees, (ii) interest expenses, (iii) taxes, (iv) expenses incurred with respect to the acquisition, and disposition of portfolio securities, commodities or other financial instruments and the execution of portfolio transactions, including brokerage commissions, (v) distribution fees or expenses, and (vi) litigation expenses and any extraordinary expenses. The Fund may incur “Acquired Fund Fees and Expenses.” Acquired Fund Fees and Expenses reflect the Fund's pro rata share of the fees and expenses incurred by investing in other investment companies. The impact of Acquired Fund Fees and Expenses is included in the total returns of the Fund. Acquired Fund Fees and Expenses are not included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Fund's prospectus (the “Prospectus”). BFA, the investment adviser to the Fund, has contractually agreed to waive a portion of its management fees in an amount equal to the Acquired Fund Fees and Expenses, if any, attributable to investments by the Fund in other funds advised by BFA, or its affiliates, through February 28, 2025. The contractual waiver may be terminated prior to February 28, 2025 only upon written agreement of the Trust and BFA.

You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Annual Fund Operating Expenses
(ongoing expenses that you pay each year as a
percentage of the value of your investments)

Management
Fees

Distribution
and
Service (12b-1)
Fees

Other
Expenses

Acquired Fund
Fees
and Expenses

Total Annual
Fund
Operating
Expenses

Fee Waiver

Total Annual
Fund
Operating
Expenses
After
Fee Waiver

0.28%

None

0.01%

0.29%

(0.01)%

0.28%

S-1

Table of Contents

Example. This Example is intended to help you compare the cost of owning shares of the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

1 Year		3 Years		5 Years		10 Years
$29		$90		$160		$365

Portfolio Turnover. The Fund may pay transaction costs, such as commissions, when it, directly or indirectly through a subsidiary, buys and sells securities or other assets (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 0% of the average value of its portfolio.

Principal Investment Strategies

The Fund seeks to track the investment results of the Bloomberg Roll Select Commodity Total Return Index (the “Underlying Index”), which measures the performance of 23 futures contracts across 21 physical agricultural, energy, precious metals and industrial metals commodities. The Underlying Index, which is rebalanced annually, provides broad-based exposure to commodities as an asset class by using liquidity factors and sector caps to avoid over-concentration in any single commodity or commodity sector.

In seeking to achieve its investment

objective, the Fund will primarily invest in exchange-traded futures contracts (“Index Futures”) on the Underlying Index, and is expected to roll out of existing positions in Index Futures and establish new positions in Index Futures on an ongoing basis. Index Futures subsequently acquired by the Fund may have terms that differ from those of the Index Futures it currently holds and the purchase and sale of these Index Futures may incur transaction fees. The Fund also seeks to generate interest income and capital appreciation on the cash balances arising from its investment in futures contracts through a cash management strategy consisting of investments in cash and cash equivalents, short-term government obligations and short-term investment grade fixed-income securities (collectively, “Fixed-Income Investments”).

In order to maintain exposure to a futures contract on a particular commodity, an investor must sell the position in the expiring contract and buy a new position in a contract with a later delivery month, which is referred to as “rolling.” If the price for the new futures contract is less than the price of the expiring contract, then the market for the commodity is said to be in “backwardation.” In these markets, roll

S-2

Table of Contents

returns are positive, which is referred to as “positive carry.” The term “contango” is used to describe a market in which the price for a new futures contract is more than the price of the expiring contract. In these markets, roll returns are negative, which is referred to as “negative carry.” The Underlying Index seeks to employ a positive carry strategy that emphasizes commodities and futures contract months with the greatest degree of backwardation and lowest degree of contango, resulting in net gains through positive roll returns.

The Fund will invest in financial instruments providing exposure to commodities and not in the physical commodities themselves. The Fund may also invest in exchange-traded commodity futures contracts similar to those found in the Underlying Index, as well as swaps and options on futures that correlate to the investment returns of commodities without investing directly in physical commodities and over-the-counter commodity-linked instruments like commodity-linked notes, swaps and forward contracts (together, the “Commodity Investments”). Investing in derivative contracts may have a leveraging effect on the Fund. Although the Fund may hold the same futures contracts under the same futures rolling schedule as those included in the Underlying Index, the Fund is not obligated to invest in any futures contracts included in, and does not seek to replicate the performance of, the Underlying Index. As of October 31, 2021, the Underlying Index was comprised of 18 components.

BFA uses a “passive” or indexing approach to try to achieve the Fund’s investment objective. Unlike many investment companies, the Fund does not try to “beat” the index it tracks and

does not seek temporary defensive positions when markets decline or appear overvalued.

Indexing may eliminate the chance that the Fund will substantially outperform the Underlying Index but also may reduce some of the risks of active management, such as poor selection of securities and/or other instruments. Indexing seeks to achieve lower costs and better after-tax performance by aiming to keep portfolio turnover low in comparison to actively managed investment companies.

BFA uses a representative sampling indexing strategy to manage the Fund. “Representative sampling” is an indexing strategy that involves investing in a representative sample of securities and/or other instruments that collectively has an investment profile similar to that of an applicable underlying index. The securities and/or other instruments selected are expected to have, in the aggregate, investment characteristics (based on factors such as market value and industry weightings), fundamental characteristics (such as return variability, duration, maturity, credit ratings and yield) and liquidity measures similar to those of an applicable underlying index. The Fund may or may not hold all of the securities and/or other instruments in the Underlying Index.

The Fund seeks to gain exposure to Index Futures and other Commodity Investments by investing through a wholly-owned subsidiary organized in the Cayman Islands (the “Subsidiary”). The Subsidiary is advised by BFA and has the same investment objective as the Fund. Unlike the Fund, the Subsidiary is not an investment company registered under the

S-3

Table of Contents

Investment Company Act of 1940, as amended (the “1940 Act”). The Subsidiary invests solely in Commodity Investments and cash and cash equivalents. In compliance with Subchapter M of the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”), the Fund may invest up to 25% of its total assets in the Subsidiary. The Fund’s Commodity Investments held in the Subsidiary are intended to provide the Fund with exposure to broad commodities consistent with current U.S. federal income tax laws applicable to investment companies such as the Fund, which limit the ability of investment companies to invest directly in Commodity Investments.

The remainder of the Fund’s assets will be invested directly by the Fund, primarily in Fixed-Income Investments, including repurchase agreements, money market instruments, U.S. government and agency securities, Treasury inflation-protected securities, sovereign debt obligations on non-U.S. countries and investment-grade corporate bonds. The Fund invests in Fixed-Income Investments for investment purposes and to provide sufficient assets to account for (or “cover”) mark-to-market changes and to collateralize the Subsidiary’s investments in derivatives.

The Commodity Futures Trading Commission (“CFTC”) has adopted certain requirements that subject registered investment companies and their advisers to regulation by the CFTC if a registered investment company invests more than a prescribed level of its net asset value in CFTC-regulated futures, options and swaps, or if a registered investment company markets itself as providing investment exposure

to such instruments. Due to the Fund’s potential use of CFTC-regulated futures, options and swaps above the prescribed levels, it is considered a “commodity pool” under the Commodity Exchange Act (“CEA”).

The Underlying Index is sponsored by Bloomberg Index Services Limited (the “Index Provider” or “Bloomberg”), which is independent of the Fund and BFA. The Index Provider determines the composition and relative weightings of the securities in the Underlying Index and publishes information regarding the market value of the Underlying Index.

Summary of Principal Risks

As with any investment, you could lose all or part of your investment in the Fund, and the Fund's performance could trail that of other investments. The Fund is subject to certain risks, including the principal risks noted below, any of which may adversely affect the Fund's net asset value per share (“NAV”), trading price, yield, total return and ability to meet its investment objective. The order of the below risk factors does not indicate the significance of any particular risk factor.

Asset Class Risk. Securities and other assets in the Fund's portfolio may underperform in comparison to the general financial markets, a particular financial market or other asset classes (including the futures market).

Assets Under Management (AUM) Risk. From time to time, an Authorized Participant (as defined in the Creations and Redemptions section of the Prospectus), a third-party investor, the Fund’s adviser or an affiliate of the Fund’s adviser, or a fund may invest in the Fund and hold its investment for a specific period of time to allow the Fund

S-4

Table of Contents

to achieve size or scale. There can be no assurance that any such entity would not redeem its investment or that the size of the Fund would be maintained at such levels, which could negatively impact the Fund.

Authorized Participant Concentration Risk. Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting. Authorized Participant concentration risk may be heightened for exchange-traded funds (“ETFs”), such as the Fund, that invest in securities issued by non-U.S. issuers or other securities or instruments that have lower trading volumes.

Calculation Methodology Risk. The Underlying Index relies on various sources of information to assess the criteria of issuers included in the Underlying Index, including information that may be based on assumptions and estimates. Neither the Fund nor BFA can offer assurances that the Underlying Index’s calculation methodology or sources of information will provide an accurate assessment of included issuers.

Carry Strategy Risk. The futures market for a commodity in which the price for a new futures contract is less than the price of an expiring contract, known as a market trading in a state of “backwardation,” may not continue to trade with the same degree of backwardation or with the resulting returns. To the extent that a commodity futures market is not trading in a state of backwardation (or is trading in such a state, but to a lesser degree), the Fund’s cost to maintain exposure to the commodity may increase, the positive carry strategy may prove unsuccessful, and the investment performance of the Fund may suffer.

Cash Management Risk. If a significant amount of the Fund’s assets are invested in cash and cash equivalents, the Fund may underperform other funds that do not similarly invest in cash and cash equivalents for investment purposes and/or to collateralize derivative instruments.

Commodity-Linked Derivatives Risk. The value of a commodity-linked derivative instrument typically is based upon the price movements of the underlying commodity or an economic variable linked to such price movements. Spot prices and futures prices for commodities will vary depending upon expectations regarding market conditions. Both spot and futures prices of commodity-linked investments may fluctuate quickly and dramatically as a result of changes affecting a particular commodity and may not correlate to price movements in other asset classes, such as stocks, bonds and cash. Commodity-linked derivatives are subject to the risk that the counterparty to the transaction, the exchange or trading facility on which they trade or the applicable clearing

S-5

Table of Contents

house may default or otherwise fail to perform. The Fund’s use of commodity-linked derivatives may also have a leveraging effect on the Fund’s portfolio because of the leverage inherent in the use of derivatives. Leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the Fund would otherwise have had. The Fund is required to post margin with respect to its holdings in derivatives. Each of these factors and events could have a significant negative impact on the Fund.

Commodity Regulatory Risk. The Fund and the Subsidiary are deemed commodity pools and BFA is considered a “commodity pool operator” with respect to the Fund and the Subsidiary under the CEA. BFA is therefore subject to regulation by the SEC and the CFTC. BFA is also subject to regulation by the National Futures Association (“NFA”). The regulatory requirements governing the use of commodity futures, options on commodity futures, certain swaps or certain other investments could change at any time.

Commodity Risk. The Fund has substantial exposure to commodities. The Fund invests in instruments and companies that are susceptible to fluctuations in certain commodity markets and to price changes due to trade relations, including the imposition of tariffs by the U.S. and other countries. Any negative changes in commodity markets that may be due to changes in supply and demand for commodities, market events, regulatory developments, other catastrophic events, or other factors that the Fund cannot control could have an adverse impact on the Commodity Investments in which the Fund invests.

Counterparty Risk. Certain commodity-linked derivative instruments, uncleared swaps and other forms of financial instruments that involve counterparties subject the Fund to the risk that the counterparty could default on its obligations under the agreement, either through the counterparty’s bankruptcy or failure to perform its obligations. In the event of a counterparty default, the Fund could experience lengthy delays in recovering some or all of its assets or obtain no recovery at all and, if the counterparty is subject to specified types of resolution proceedings, the Fund may be subject to stays that limit its ability to close out positions and limit risk. The Fund’s investments in the futures markets also introduce the risk that its futures commission merchant (“FCM”) could default on an obligation set forth in an agreement between the Fund and the FCM, including the FCM’s obligation to return margin posted in connection with the Fund’s futures contracts.

S-6

Table of Contents

affect the value of the Fund’s investment in that issuer. The degree of credit risk depends on an issuer's or counterparty's financial condition and on the terms of an obligation.

Cybersecurity Risk. Failures or breaches of the electronic systems of the Fund, the Fund's adviser, distributor, the Index Provider and other service providers, market makers, Authorized Participants or the issuers of securities in which the Fund invests have the ability to cause disruptions, negatively impact the Fund’s business operations and/or potentially result in financial losses to the Fund and its shareholders. While the Fund has established business continuity plans and risk management systems seeking to address system breaches or failures, there are inherent limitations in such plans and systems. Furthermore, the Fund cannot control the cybersecurity plans and systems of the Fund’s Index Provider and other service providers, market makers, Authorized Participants or issuers of securities in which the Fund invests.

and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. The Fund could also suffer losses related to its derivatives positions as a result of unanticipated market movements, or movements between the time of periodic reallocations of Fund assets, which losses are potentially unlimited. Certain derivatives may give rise to a form of leverage and may expose the Fund to greater risk and increase its costs. The impact of U.S. and global regulation of derivatives may make derivatives more costly, may limit the availability of derivatives, may delay or restrict the exercise by the Fund of termination rights or remedies upon a counterparty default under derivatives held by the Fund (which could result in losses), or may otherwise adversely affect the value or performance of derivatives.

Energy Sector Risk. The performance of energy-related commodities is generally cyclical and highly dependent on energy prices. The market value of energy-related commodities may decline for many reasons, including, among others, changes in energy prices, energy supply and demand, global political changes, terrorism, natural disasters and other catastrophes; government regulations, taxation policies and energy conservation efforts. The energy sector has recently experienced increased volatility. In particular, significant market volatility in the crude oil markets as well as the oil futures markets, which resulted in the market price of the front month WTI crude oil futures contract falling below zero for a period of time.

S-7

Table of Contents

conditions in seven calendar days or less without significantly changing the market value of the investment. To the extent the Fund holds illiquid investments, the illiquid investments may reduce the returns of the Fund because the Fund may be unable to transact at advantageous times or prices. During periods of market volatility, liquidity in the market for the Fund’s shares may be impacted by the liquidity in the market for the underlying securities or instruments held by the Fund, which could lead to the Fund’s shares trading at a premium or discount to the Fund’s NAV.

Income Risk. The Fund’s income may decline when yields fall. This decline can occur because the Fund may subsequently invest in lower-yielding Fixed-Income Investments, as Fixed-Income Investments in its portfolio mature, are near maturity or are called, or the Fund otherwise needs to purchase additional bonds.

S-8

Table of Contents

rebalance, which could cause the Underlying Index to vary from its normal or expected composition.

Infectious Illness Risk. An outbreak of an infectious respiratory illness, COVID-19, caused by a novel coronavirus has resulted in travel restrictions, disruption of healthcare systems, prolonged quarantines, cancellations, supply chain disruptions, lower consumer demand, layoffs, ratings downgrades, defaults and other significant economic impacts. Certain markets have experienced temporary closures, extreme volatility, severe losses, reduced liquidity and increased trading costs. These events will have an impact on the Fund and its investments and could impact the Fund’s ability to purchase or sell securities or cause elevated tracking error and increased premiums or discounts to the Fund's NAV. Other infectious illness outbreaks in the future may result in similar impacts.

value of securities held by the Fund to decline, may lead to heightened volatility in the fixed-income markets and may adversely affect the liquidity of certain fixed-income investments, including those held by the Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. The historically low interest rate environment heightens the risks associated with rising interest rates.

Issuer Risk. The performance of the Fund depends on the performance of individual securities or other assets to which the Fund has exposure as well as the correlation among the assets. The Fund may be adversely affected if an issuer of underlying securities held by the Fund is unable or unwilling to repay principal or interest when due. Changes in the financial condition or credit rating of an issuer of those securities or of securities referenced by swaps or other derivatives or the seller or counterparty with respect to derivatives or other assets may cause the value of the securities, derivatives, or other assets to decline.

Management Risk. As the Fund will not fully replicate the Underlying Index, it is subject to the risk that BFA's investment strategy may not produce the intended results.

Market Risk. The Fund could lose money over short periods due to short-term market movements and over longer periods during more prolonged market downturns. Local, regional or

S-9

Table of Contents

global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund and its investments and could result in increased premiums or discounts to the Fund’s NAV.

Market Trading Risk. The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, periods of high volatility and disruptions in the creation/redemption process. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

Money Market Instruments Risk. The value of money market instruments may be affected by changing interest rates and by changes in the credit ratings of the investments. If a significant amount of the Fund's assets are invested in money market instruments, it will be more difficult for the Fund to achieve its investment objective. An investment in a money market fund is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. It is possible to lose money by investing in a money market fund. Money market funds other than government money market funds or retail money market funds “float” their NAV instead of using a stable $1.00 per share price.

Non-Diversification Risk. The Fund may invest a large percentage of its assets in securities issued by or representing a small number of issuers or in derivatives with a limited number of counterparties. As a result, the Fund's performance may depend on

the performance of a small number of issuers and counterparties.

Non-U.S. Issuers Risk. Securities issued by non-U.S. issuers carry different risks from securities issued by U.S. issuers. These risks include differences in accounting, auditing and financial reporting standards, the possibility of expropriation or confiscatory taxation, adverse changes in investment or exchange control regulations, political instability, regulatory and economic differences, and potential restrictions on the flow of international capital. The Fund is specifically exposed to European Economic Risk.

Operational Risk. The Fund is exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund’s service providers, counterparties or other third parties, failed or inadequate processes and technology or systems failures. The Fund and BFA seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

Passive Investment Risk. The Fund is not actively managed, and BFA generally does not attempt to take defensive positions under any market conditions, including declining markets.

S-10

Table of Contents

supply and demand of each commodity. Increased competition and changes in consumer tastes and spending can also influence the demand for agricultural and livestock products, affecting the price of such commodities and the performance of the Fund.

Risk of Investing in Developed Countries. The Fund’s investment in developed country issuers may subject the Fund to regulatory, political, currency, security, economic and other risks associated with developed countries. Developed countries tend to represent a significant portion of the global economy and have generally experienced slower economic growth than some less developed countries. Certain developed countries have experienced security concerns, such as terrorism and strained international relations. Incidents involving a country’s or region’s security may cause uncertainty in its markets and may adversely affect its economy and the Fund’s investments. In addition, developed countries may be adversely impacted by changes to the economic conditions of certain key trading partners, regulatory burdens, debt burdens and the price or availability of certain commodities.

Risk of Investing in the U.S. Certain changes in the U.S. economy, such as when the U.S. economy weakens or when its financial markets decline, may have an adverse effect on the securities to which the Fund has exposure.

each counterparty. Swaps may be leveraged and are subject to counterparty risk, credit risk and pricing risk. Swaps may be subject to illiquidity risk, and it may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses. Certain standardized interest rate and credit default swaps are required to be traded on an exchange or trading platform and centrally cleared. Most other swaps are entered into a negotiated, bi-lateral basis and traded in the over-the-counter market. Swaps are subject to bi-lateral variation margin. Initial margin requirements are in the process of being phased in, and the Fund may be subject to such requirements as early as September 2022. These requirements may raise the costs for the Fund’s investment in swaps.

Structural Risk. The countries in which the Fund invests may be subject to considerable degrees of economic, political and social instability.

Subsidiary Risk. In compliance with Subchapter M of the Internal Revenue Code, the Fund may invest up to 25% of its total assets in the Subsidiary. By investing in the Subsidiary, the Fund is indirectly exposed to the risks associated with the Subsidiary’s investments. The Subsidiary is not registered under the 1940 Act, and, unless otherwise noted in this Prospectus, is not subject to the investor protections of the 1940 Act. Changes in the laws of the U.S. and/or the Cayman Islands could result in the inability of the Fund and/or the Subsidiary to operate as described in the Prospectus and the Statement of Additional Information (“SAI”), and could adversely affect the Fund.

S-11

Table of Contents

the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be heightened during times of increased market volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX ETFs THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN FUTURES CONTRACTS ISSUERS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

Valuation Risk. The price the Fund could receive upon the sale of a security or other asset may differ from the Fund's valuation of the security or other asset, particularly for securities or other assets that trade in low volume or volatile markets or that are valued using a fair value methodology as a result of trade suspensions or for other reasons. In addition, the value of the securities or other assets in the Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund's shares. Authorized Participants who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

S-12

Table of Contents

Performance Information

The bar chart and table that follow show how the Fund has performed on a calendar year basis and provide some indication of the risks of investing in the Fund by showing how the Fund’s average annual returns for 1 year and since inception compare with those of a broad measure of market performance. Prior to March 1, 2021, the Fund operated as a transparent active ETF. Both assume that all dividends and distributions have been reinvested in the Fund. Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. If BFA had not waived certain Fund fees during certain periods, the Fund's returns would have been lower.

Year by Year Returns (Years Ended December 31)

The best calendar quarter return during the periods shown above was 13.61% in the 2nd quarter of 2021; the worst was -19.40% in the 1st quarter of 2020.

Updated performance information, including the Fund’s current NAV, may be obtained by visiting our website at www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).

S-13

Table of Contents

Average Annual Total Returns

(for the periods ended December 31, 2021)

	One Year	Since Fund Inception
(Inception Date: 4/3/2018)
Return Before Taxes	26.97%	4.98%
Return After Taxes on Distributions¹	19.63%	2.87%
Return After Taxes on Distributions and Sale of Fund Shares¹	15.86%	2.91%
Bloomberg Roll Select Commodity Total Return Index (Index returns do not reflect deductions for fees, expenses, or taxes)	27.93%	5.49%

After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to tax-exempt investors or investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). Fund returns after taxes on distributions and sales of Fund shares are calculated assuming that an investor has sufficient capital gains of the same character from other investments to offset any capital losses from the sale of Fund shares. As a result, Fund returns after taxes on distributions and sales of Fund shares may exceed Fund returns before taxes and/or returns after taxes on distributions.

S-14

Table of Contents

Management

Investment Adviser. BlackRock Fund Advisors.

Portfolio Managers. Richard Mejzak, Greg Savage, Paul Whitehead and Amy Whitelaw (the “Portfolio Managers”) are primarily responsible for the day-to-day management of the Fund. Each Portfolio Manager supervises a portfolio management team. Mr. Mejzak and Mr. Savage have been Portfolio Managers of the Fund since 2018. Mr. Whitehead and Ms. Whitelaw have been Portfolio Managers of the Fund since 2022 and 2019, respectively.

Purchase and Sale of Fund Shares

The Fund is an ETF. Individual shares of the Fund may only be bought and sold in the secondary market through a broker-dealer. Because ETF shares trade at market prices rather than at NAV, shares may trade at a price greater than NAV (a premium) or less than NAV (a discount). An investor may incur costs attributable to the difference between the highest price a buyer is willing to pay to purchase shares of the Fund (bid) and the lowest price a seller is willing to accept for shares of the Fund (ask) when buying or selling shares in the secondary market (the “bid-ask spread”).

Tax Information

The Fund intends to make distributions that may be taxable to you as ordinary income or capital gains, unless you are investing through a tax-deferred arrangement such as a 401(k) plan or an IRA, in which case, your distributions generally will be taxed when withdrawn.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase shares of the Fund through a broker-dealer or other financial intermediary (such as a bank), BFA or other related companies may pay the intermediary for marketing activities and presentations, educational training programs, conferences, the development of technology platforms and reporting systems or other services related to the sale or promotion of the Fund. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary’s website for more information.

S-15

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

More Information About the Fund

This Prospectus contains important information about investing in the Fund. Please read this Prospectus carefully before you make any investment decisions. Additional information regarding the Fund is available at www.iShares.com.

BFA is the investment adviser to the Fund. Shares of the Fund are listed for trading on NYSE Arca, Inc. (“NYSE Arca”). The market price for a share of the Fund may be different from the Fund’s most recent NAV.

ETFs are funds that trade like other publicly-traded securities. The Fund is designed to track an index. Similar to shares of an index mutual fund, each share of the Fund represents an ownership interest in an underlying portfolio of securities and other instruments intended to track a market index. Unlike shares of a mutual fund, which can be bought and redeemed from the issuing fund by all shareholders at a price based on NAV, shares of the Fund may be purchased or redeemed directly from the Fund at NAV solely by Authorized Participants and only in aggregations of a specified number of shares (“Creation Units”). Also unlike shares of a mutual fund, shares of the Fund are listed on a national securities exchange and trade in the secondary market at market prices that change throughout the day.

The Fund invests in a particular segment of the financial markets and seeks to track the performance of an index that is not representative of the market as a whole. The Fund is designed to be used as part of broader asset allocation strategies. Accordingly, an investment in the Fund should not constitute a complete investment program.

An index is a financial calculation, based on a grouping of financial instruments, and is not an investment product, while the Fund is an actual investment portfolio. The performance of the Fund and the Underlying Index may vary for a number of reasons, including transaction costs, non-U.S. currency valuations, asset valuations, corporate actions (such as mergers and spin-offs), timing variances and differences between the Fund’s portfolio and the Underlying Index resulting from the Fund's use of representative sampling or from legal restrictions (such as diversification requirements) that apply to the Fund but not to the Underlying Index. From time to time, the Index Provider may make changes to the methodology or other adjustments to the Underlying Index. Unless otherwise determined by BFA, any such change or adjustment will be reflected in the calculation of the Underlying Index performance on a going-forward basis after the effective date of such change or adjustment. Therefore, the Underlying Index performance shown for periods prior to the effective date of any such change or adjustment will generally not be recalculated or restated to reflect such change or adjustment.

“Tracking error” is the divergence of the Fund's performance from that of the Underlying Index. Because the Fund uses a representative sampling indexing strategy, it can be expected to have a larger tracking error than if it used a replication indexing strategy. “Replication” is an indexing strategy in which a fund invests in substantially all of the securities in its underlying index in approximately the same proportions as in the underlying index.

Table of Contents

An investment in the Fund is not a bank deposit and it is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, BFA or any of its affiliates.

The Fund's investment objective and the Underlying Index may be changed without shareholder approval.

A Further Discussion of Principal Risks

The Fund is subject to various risks, including the principal risks noted below, any of which may adversely affect the Fund’s NAV, trading price, yield, total return and ability to meet its investment objective. You could lose all or part of your investment in the Fund, and the Fund could underperform other investments. The order of the below risk factors does not indicate the significance of any particular risk factor.

Asset Class Risk. The securities and other assets in the Fund’s portfolio may underperform in comparison to other securities, assets or indexes that track other issuers, countries, groups of countries, regions, industries, groups of industries, markets, market segments, asset classes or sectors (including the futures market). Various types of securities or assets may experience cycles of outperformance and underperformance in comparison to the general financial markets depending upon a number of factors including, among other things, inflation, interest rates, productivity, global demand for local products or resources, and regulation and governmental controls. This may cause the Fund to underperform other investment vehicles that invest in different asset classes.

Assets Under Management (AUM) Risk. From time to time, an Authorized Participant, a third-party investor, the Fund’s adviser or an affiliate of the Fund’s adviser, or a fund may invest in the Fund and hold its investment for a specific period of time to allow the Fund to achieve size or scale. There can be no assurance that any such entity would not redeem its investment or that the size of the Fund would be maintained at such levels, which could negatively impact the Fund.

Authorized Participant Concentration Risk. Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem Creation Units, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting. Authorized Participant concentration risk may be heightened because ETFs, such as the Fund, that invest in securities issued by non-U.S. issuers or other securities or instruments that are less widely traded often involve greater settlement and operational issues and capital costs for Authorized Participants, which may limit the availability of Authorized Participants.

Calculation Methodology Risk. The Underlying Index relies on various sources of information to assess the criteria of issuers included in the Underlying Index, including

Table of Contents

information that may be based on assumptions and estimates. Neither the Fund nor BFA can offer assurances that the Underlying Index's calculation methodology or sources of information will provide an accurate assessment of included issuers.

Cash Management Risk. To the extent the Fund holds cash, the Fund will earn reduced income (if any) on the cash and will be subject to the credit risk of the depository institution holding the cash and any fees imposed on large cash balances. If a significant amount of the Fund’s assets are invested in cash and cash equivalents, the Fund may underperform other funds that do not similarly invest in cash and cash equivalents for investment purposes and/or to collateralize derivative instruments.

Commodity-Linked Derivatives Risk. The value of a commodity-linked derivative instrument typically is based upon the price movements of the underlying commodity or an economic variable linked to such price movements. Therefore, the value of commodity-linked derivative instruments may be affected by changes in overall economic conditions, interest rates, or factors affecting a particular commodity or industry, such as production, disease, climate conditions, supply or demand, politics, geopolitics, changes in international balance of payments and trade, currency devaluations and revaluations, market liquidity, and economic, political and regulatory developments. Spot prices and futures prices for commodities will vary depending upon expectations regarding market conditions. Both spot and futures prices of commodity-related investments may fluctuate quickly and dramatically as a result of changes affecting a particular commodity and may or may not correlate to price movements in other asset classes, such as stocks, bonds and cash. Investments in commodity-linked derivatives may be subject to greater volatility than non-derivative based investments because of the leverage inherent in the use of derivatives. A highly liquid secondary market may not exist for certain commodity-linked derivatives, and there can be no assurance that one will develop. Commodity-linked derivatives also may be subject to credit and interest rate risks that in general affect the values of fixed-income securities. Therefore, at maturity, the Fund may receive more or less principal than it originally invested. The Fund might receive interest payments that are more or less than the stated coupon interest payments. Commodity derivatives are subject to the risk that the counterparty to the transaction, the exchange or trading facility on which they trade or the applicable clearing house may default or otherwise fail to perform. In addition, each exchange or trading facility on which derivatives are traded has the right to suspend or limit trading in all futures or other instruments that it lists. The Fund’s use of commodity-linked derivatives can result in large amounts of financial leverage. Although the Fund will not borrow money in order to increase the amount of its trading, the low margin deposits normally required in futures trading

Table of Contents

permit a high degree of leverage on the investment itself. Accordingly, a relatively small price movement in a futures contract may result in immediate and substantial losses to the Fund. Like other leveraged investments, any trade may result in losses in excess of the amount invested. Each of these factors and events could have a significant negative impact on the Fund.

Commodity Regulatory Risk. The Fund and the Subsidiary are deemed “commodity pools” and BFA is considered a “commodity pool operator” with respect to the Fund under the CEA. BFA is therefore subject to regulation by the SEC and the CFTC. BFA is also subject to regulation by the NFA. The regulatory requirements governing the use of commodity futures, options on commodity futures, certain swaps or certain other investments could change at any time.

The CFTC and the U.S. commodities exchanges impose limits referred to as “speculative position limits” on the maximum net long or net short speculative positions that any person may hold or control in any particular futures contracts (or options thereon) traded on U.S. commodities exchanges. CFTC rules impose position limits on certain futures contracts (and options thereon) and physical commodity swaps that are “economically equivalent” to such contracts. As a result of these position limits, the size or duration of positions available to the Fund may be severely limited.

Commodity Risk. The Fund’s portfolio may be adversely affected by changes or trends in commodity prices. Commodity prices may be influenced or characterized by unpredictable factors, including, where applicable, high volatility, changes in supply and demand relationships, weather, agriculture, trade, pestilence, political instability, catastrophic events, changes in interest rates and monetary and other governmental policies, action and inaction, including price changes due to the imposition of tariffs by the U.S. and other countries.

Concentration Risk. The Fund may be susceptible to an increased risk of loss, including losses due to adverse events that affect the Fund’s investments more than the market as a whole, to the extent that the Fund's investments are concentrated in the securities and/or other assets of a particular issuer or issuers, representing a particular country, group of countries, region, market, industry, group of industries, sector, market segment or asset class. The Fund may be more adversely affected by the underperformance of those securities and/or other assets, may experience increased price volatility and may be more susceptible to adverse economic, market, political or regulatory occurrences affecting those securities and/or other assets than a fund that does not concentrate its investments.

Table of Contents

to the CEA with a clearing broker registered as an FCM, which is an entity that solicits or accepts orders to buy or sell commodity futures, options, swaps or forward contracts and accepts money or other assets from customers to support such orders. The FCM could default on an obligation set forth in an agreement between the Fund and the FCM, including the FCM’s obligation to return margin posted in connection with the Fund’s futures contracts. If a counterparty defaults on its payment obligations, the Fund may lose money and the value of an investment in Fund shares may decrease. In addition, the Fund may engage in such investment transactions with a limited number of counterparties, which may increase the Fund’s exposure to counterparty credit risk.

Credit Risk. Credit risk is the risk that the issuer or guarantor of a debt instrument or the counterparty to a derivatives contract, repurchase agreement or loan of portfolio securities will be unable or unwilling to make its timely interest and/or principal payments when due or otherwise honor its obligations. There are varying degrees of credit risk, depending on an issuer’s or counterparty’s financial condition and on the terms of an obligation, which may be reflected in the issuer’s or counterparty’s credit rating. There is the chance that the Fund’s portfolio holdings will have their credit ratings downgraded or will default (i.e., fail to make scheduled interest or principal payments), or that the market’s perception of an issuer’s creditworthiness may worsen, potentially reducing the Fund’s income level or share price.

Cybersecurity Risk. With the increased use of technologies such as the internet to conduct business, the Fund, Authorized Participants, service providers and the relevant listing exchange are susceptible to operational, information security and related “cyber” risks both directly and through their service providers. Similar types of cybersecurity risks are also present for issuers of securities in which the Fund invests, which could result in material adverse consequences for such issuers and may cause the Fund’s investment in such issuers to lose value. In general, cyber incidents can result from deliberate attacks or unintentional events. Cyber incidents include, but are not limited to, gaining unauthorized access to digital systems (e.g., through “hacking” or malicious software coding) for purposes of misappropriating assets or sensitive information, corrupting data, or causing operational disruption. Cyberattacks may also be carried out in a manner that does not require gaining unauthorized access, such as causing denial-of-service attacks on websites (i.e., efforts to make network services unavailable to intended users). Recently, geopolitical tensions may have increased the scale and sophistication of deliberate attacks, particularly those from nation-states or from entities with nation-state backing.

Table of Contents

laws, regulatory fines, penalties, reputational damage, reimbursement or other compensation costs, or additional compliance costs. In addition, cyberattacks may render records of Fund assets and transactions, shareholder ownership of Fund shares, and other data integral to the functioning of the Fund inaccessible, inaccurate or incomplete. Substantial costs may be incurred by the Fund in order to resolve or prevent cyber incidents in the future. While the Fund has established business continuity plans in the event of, and risk management systems to prevent, such cyber incidents, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, that prevention and remediation efforts will not be successful or that cyberattacks will go undetected. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund, issuers in which the Fund invests, the Index Provider, market makers or Authorized Participants. The Fund and its shareholders could be negatively impacted as a result.

Derivatives Risk. The Fund’s use of derivatives may reduce the Fund’s returns or increase volatility. Volatility is defined as the characteristic of a security, a currency, an index or a market to fluctuate significantly in price within a short time period. Derivatives may also be subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund’s use of derivatives is that the fluctuations in their values may not correlate perfectly with the value of the underlying asset, the performance of the asset class to which the Fund seeks exposure or the performance of the overall markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. The Fund could also suffer losses related to its derivatives positions as a result of unanticipated market movements, or movements between the time of periodic reallocations of Fund assets, which losses are potentially unlimited. Certain derivatives may give rise to a form of leverage and may expose the Fund to greater risk and increase its costs. The impact of U.S. and global regulation of derivatives may make derivatives more costly, may limit the availability of derivatives, may delay or restrict the exercise by the Fund of termination rights or remedies upon a counterparty default under derivatives held by the Fund (which could result in losses), or may otherwise adversely affect the value or performance of derivatives.

Energy Sector Risk. The performance of energy-related commodities is generally cyclical and highly dependent on energy prices. Energy prices may fluctuate significantly due to, among other things, national and international political changes, Organization of Petroleum Exporting Countries (“OPEC”) and non-OPEC energy exporters, such as the Russian Federation, policies and relationships, and the economies of key energy-consuming countries. The market value of energy-related commodities may decline for many reasons, including, among other things: changes in the levels and volatility of global energy prices, energy supply and demand, and capital expenditures on exploration and production of energy sources; exchange rates, interest rates, economic conditions, and tax treatment; terrorism, natural disasters and other catastrophes; and energy conservation efforts, increased competition and technological advances. The energy sector may also be subject to substantial

Table of Contents

government regulation and contractual fixed pricing. In 2020, in the context of the COVID-19 outbreak and disputes among oil-producing countries regarding potential limits on the production of crude oil, the energy sector has experienced increased volatility. In particular, significant market volatility occurred in the crude oil markets as well as the oil futures markets, which resulted in the market price of the front month WTI crude oil futures contract falling below zero for a period of time.

European Economic Risk. The Economic and Monetary Union (the “eurozone”) of the European Union (the “EU”) requires compliance by member states that are members of the eurozone with restrictions on inflation rates, deficits, interest rates and debt levels, as well as fiscal and monetary controls, each of which may significantly affect every country in Europe, including those countries that are not members of the eurozone. Additionally, European countries outside of the eurozone may present economic risks that are independent of the indirect effects that eurozone policies have on them. In particular, the United Kingdom's (the “U.K.”) economy may be affected by global economic, industrial and financial shifts. Changes in imports or exports, changes in governmental or EU regulations on trade, changes in the exchange rate of the euro (the common currency of eurozone countries), the default or threat of default by an EU member state on its sovereign debt and/or an economic recession in an EU member state may have a significant adverse effect on the economies of other EU member states and their trading partners. The European financial markets have historically experienced volatility and adverse trends due to concerns about economic downturns or rising government debt levels in several European countries, including, but not limited to, Austria, Belgium, Cyprus, France, Greece, Ireland, Italy, Portugal, Spain and Ukraine. These events have adversely affected the exchange rate of the euro and may continue to significantly affect European countries.

Responses to financial problems by European governments, central banks and others, including austerity measures and reforms, may not produce the desired results, may result in social unrest, may limit future growth and economic recovery or may have other unintended consequences. Further defaults or restructurings by governments and other entities of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In addition, one or more countries may abandon the euro and/or withdraw from the EU. The U.K. left the EU (“Brexit”) on January 31, 2020. The U.K. and EU have reached an agreement on the terms of their future trading relationship effective January 1, 2021, which principally relates to the trading of goods rather than services, including financial services. Further discussions are to be held between the U.K. and the EU in relation to matters not covered by the trade agreement, such as financial services. The Fund faces risks associated with the potential uncertainty and consequences that may follow Brexit, including with respect to volatility in exchange rates and interest rates. Brexit could adversely affect European or worldwide political, regulatory, economic or market conditions and could contribute to instability in global political institutions, regulatory agencies and financial markets. Brexit has also led to legal uncertainty and could lead to politically divergent national laws and regulations as a new relationship between the U.K. and EU is defined and the U.K. determines which EU laws to replace or replicate. Any of these effects of Brexit could adversely affect any of the companies to which the Fund has exposure and any other assets in which the Fund invests. The political,

Table of Contents

economic and legal consequences of Brexit are not yet fully known. In the short term, financial markets may experience heightened volatility, particularly those in the U.K. and Europe, but possibly worldwide. The U.K. and Europe may be less stable than they have been in recent years, and investments in the U.K. and the EU may be difficult to value or subject to greater or more frequent volatility. In the longer term, there is likely to be a period of significant political, regulatory and commercial uncertainty as the U.K. continues to negotiate the terms of its future trading relationships.

Secessionist movements, such as the Catalan movement in Spain and the independence movement in Scotland, as well as governmental or other responses to such movements, may also create instability and uncertainty in the region. In addition, the national politics of countries in the EU have been unpredictable and subject to influence by disruptive political groups and ideologies. The governments of EU countries may be subject to change and such countries may experience social and political unrest. Unanticipated or sudden political or social developments may result in sudden and significant investment losses. The occurrence of terrorist incidents throughout Europe could also impact financial markets. The impact of these events is not clear but could be significant and far-reaching and could adversely affect the value and liquidity of the Fund's investments.

Futures Contract Risk. Futures are standardized, exchange-traded contracts that obligate a purchaser to take delivery, and a seller to make delivery, of a specific amount of an asset at a specified future date at a specified price. Unlike equities, which typically entitle the holder to a continuing ownership stake in an issuer, futures contracts normally specify a certain date for settlement in cash based on the level of the reference rate. The primary risks associated with the use of futures contracts are: (i) the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; (ii) possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; (iii) losses caused by unanticipated market movements, which are potentially unlimited; (iv) BFA's inability to predict correctly the direction of prices and other economic factors; and (v) the possibility that the counterparty will default in the performance of its obligations. When a futures contract is rolled forward—which may be done in order to retain the allocation to a specific position beyond the maturity of the futures contract—the Fund may lose money if the two contracts are trading at different prices as compared to fair value. For example, if the futures contract which the Fund has exposure to is trading at a discount to fair value and the contract being rolled into is trading at a premium to fair value, the Fund will lose money. The actual realization of a potential roll cost will be dependent upon the difference in price of the near and distant contracts. The relevant futures contracts may not be “rolled” on a predefined schedule as they approach expiration; instead BFA may determine to gain exposure to another futures contract (chosen from a list of tradable futures that expire in the next 9 months) in an attempt to generate maximum yield. There can be no guarantee that such a strategy will produce the desired results. In addition, CFTC regulations limit the types of foreign listed futures contracts that U.S. investors, like the Fund, are allowed to invest in. As a result, the Fund may not be able to gain the exposure it seeks through certain non-U.S. futures contracts.

Table of Contents

Illiquid Investments Risk. The Fund may invest up to an aggregate amount of 15% of its net assets in illiquid investments. An illiquid investment is any investment that the Fund reasonably expects cannot be sold or disposed of in current market conditions in seven calendar days or less without significantly changing the market value of the investment. To the extent the Fund holds illiquid investments, the illiquid investments may reduce the returns of the Fund because the Fund may be unable to transact at advantageous times or prices. An investment may be illiquid due to, among other things, the reduced number and capacity of traditional market participants to make a market in securities or instruments or the lack of an active market for such securities or instruments. To the extent that the Fund invests in securities or instruments with substantial market and/or credit risk, the Fund will tend to have increased exposure to the risks associated with illiquid investments. Liquid investments may become illiquid after purchase by the Fund, particularly during periods of market turmoil. There can be no assurance that a security or instrument that is deemed to be liquid when purchased will continue to be liquid for as long as it is held by the Fund, and any security or instrument held by the Fund may be deemed an illiquid investment pursuant to the Fund’s liquidity risk management program. Illiquid investments may be harder to value, especially in changing markets. If the Fund is forced to sell underlying investments at reduced prices or under unfavorable conditions to meet redemption requests or for other cash needs, the Fund may suffer a loss. This may be magnified in a rising interest rate environment or other circumstances where redemptions from the Fund may be greater than normal. Other market participants may be attempting to liquidate holdings at the same time as the Fund, causing increased supply of the Fund’s underlying investments in the market and contributing to illiquid investments risk and downward pricing pressure. During periods of market volatility, liquidity in the market for the Fund’s shares may be impacted by the liquidity in the market for the underlying securities or instruments held by the Fund, which could lead to the Fund’s shares trading at a premium or discount to the Fund's NAV.

Income Risk. The Fund’s income may decline when yields fall because the Fund may hold a significant portion of short duration securities and/or securities that have floating or variable interest rates. The Fund’s income may decline because the Fund invests in lower yielding Fixed-Income Investments, as Fixed-Income Investments in its portfolio mature, are near maturity or are called, or when the Fund needs to purchase additional bonds.

Table of Contents

any agent’s errors. Errors in respect of the quality, accuracy and completeness of the data used to compile the Underlying Index may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, particularly where the indices are less commonly used as benchmarks by funds or managers. Such errors may negatively or positively impact the Fund and its shareholders. For example, during a period where the Underlying Index contains incorrect constituents, the Fund would have market exposure to such constituents and would be underexposed to the Underlying Index’s other constituents. Shareholders should understand that any gains from Index Provider errors will be kept by the Fund and its shareholders and any losses or costs resulting from Index Provider errors will be borne by the Fund and its shareholders.

Unusual market conditions may cause the Index Provider to postpone a scheduled rebalance to the Underlying Index, which could cause the Underlying Index to vary from its normal or expected composition. The postponement of a scheduled rebalance in a time of market volatility could mean that constituents of the Underlying Index that would otherwise be removed at rebalance due to changes in market capitalizations, issuer credit ratings, or other reasons may remain, causing the performance and constituents of the Underlying Index to vary from those expected under normal conditions. Apart from scheduled rebalances, the Index Provider or its agents may carry out additional ad hoc rebalances to the Underlying Index due to reaching certain weighting constraints, unusual market conditions or corporate events or, for example, to correct an error in the selection of index constituents. When the Underlying Index is rebalanced and the Fund in turn rebalances its portfolio to attempt to increase the correlation between the Fund’s portfolio and the Underlying Index, any transaction costs and market exposure arising from such portfolio rebalancing will be borne directly by the Fund and its shareholders. Therefore, errors and additional ad hoc rebalances carried out by the Index Provider or its agents to the Underlying Index may increase the costs to and the tracking error risk of the Fund.

Infectious Illness Risk. An outbreak of an infectious respiratory illness, COVID-19, caused by a novel coronavirus that was first detected in December 2019 has spread globally. The impact of this outbreak has adversely affected the economies of many nations and the global economy, and may impact individual issuers and capital markets in ways that cannot be foreseen. Although vaccines have been developed and approved for use by various governments, the duration of the outbreak and its effects cannot be predicted with certainty. Any market or economic disruption can be expected to result in elevated tracking error and increased premiums or discounts to the Fund's NAV.

■

General Impact. This outbreak has resulted in travel restrictions, closed international borders, enhanced health screenings at ports of entry and elsewhere, disruption of, and delays in, healthcare service preparation and delivery, prolonged quarantines, cancellations, supply chain disruptions, lower consumer demand, temporary and permanent closures of stores, restaurants and other commercial establishments, layoffs, defaults and other significant economic impacts, as well as general concern and uncertainty.

■

Market Volatility. The outbreak has also resulted in extreme volatility, severe losses,

Table of Contents

and disruptions in markets which can adversely impact the Fund and its investments, including impairing hedging activity to the extent the Fund engages in such activity, as expected correlations between related markets or instruments may no longer apply. In addition, to the extent the Fund invests in short-term instruments that have negative yields, the Fund’s value may be impaired as a result. Certain issuers of equity securities have cancelled or announced the suspension of dividends. The outbreak has, and may continue to, negatively affect the credit ratings of some fixed-income securities and their issuers.

■	Market Closures. Certain local markets have been or may be subject to closures, and there can be no assurance that trading will continue in any local markets in which the Fund may invest, when any resumption of trading will occur or, once such markets resume trading, whether they will face further closures. Any suspension of trading in markets in which the Fund invests will have an impact on the Fund and its investments and will impact the Fund’s ability to purchase or sell securities in such markets.
■	Operational Risk. The outbreak could also impair the information technology and other operational systems upon which the Fund’s service providers, including BFA, rely, and could otherwise disrupt the ability of employees of the Fund's service providers to perform critical tasks relating to the Fund, for example, due to the service providers’ employees performing tasks in alternate locations than under normal operating conditions or the illness of certain employees of the Fund's service providers.
■	Governmental Interventions. Governmental and quasi-governmental authorities and regulators throughout the world have responded to the outbreak and the resulting economic disruptions with a variety of fiscal and monetary policy changes, including direct capital infusions into companies and other issuers, new monetary policy tools, and lower interest rates. An unexpected or sudden reversal of these policies, or the ineffectiveness of such policies, is likely to increase market volatility, which could adversely affect the Fund’s investments.
■	Pre-Existing Conditions. Public health crises caused by the outbreak may exacerbate other pre-existing political, social and economic risks in certain countries or globally, which could adversely affect the Fund and its investments and could result in increased premiums or discounts to the Fund's NAV.

Other infectious illness outbreaks that may arise in the future could have similar or other unforeseen effects.

Table of Contents

Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. In addition, decreases in fixed income dealer market-making capacity may lead to lower trading volume, heightened volatility, wider bid-ask spreads and less transparent pricing in certain fixed-income markets.

The historically low interest rate environment was created in part by the world’s major central banks keeping their overnight policy interest rates at, near or below zero percent and implementing monetary policy facilities, such as asset purchase programs, to anchor longer-term interest rates below historical levels. During periods of very low or negative interest rates, the Fund may be unable to maintain positive returns or pay dividends to Fund shareholders. Certain countries have recently experienced negative interest rates on certain fixed-income instruments. Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, result in heightened market volatility and detract from the Fund’s performance to the extent the Fund is exposed to such interest rates. Additionally, under certain market conditions in which interest rates are set at low levels and the market prices of portfolio securities have increased, the Fund may have a very low or even negative yield. A low or negative yield would cause the Fund to lose money in certain conditions and over certain time periods. Central banks may increase their short-term policy rates or begin phasing out, or “tapering,” accommodative monetary policy facilities in the future. The timing, coordination, magnitude and effect of such policy changes on various markets are uncertain, and such changes in monetary policy may adversely affect the value of the Fund’s investments.

Issuer Risk. The performance of the Fund depends on the performance of individual securities or assets to which the Fund has exposure as well as the correlation among the assets. The Fund may be adversely affected if an issuer of underlying securities held by the Fund is unable or unwilling to repay principal or interest when due. These securities or assets may perform poorly, causing the value of its securities or assets to decline. Poor performance may be caused by poor management decisions, competitive pressures, changes in technology, expiration of patent protection, disruptions in supply, labor problems or shortages, corporate restructurings, fraudulent disclosures, credit deterioration of the issuer or other factors. Changes to the financial condition or credit rating of an issuer of those securities may cause the value of the securities to decline. An issuer may also be subject to risks associated with the countries, states and regions in which the issuer resides, invests, sells products, or otherwise conducts operations.

Management Risk. Because BFA uses a representative sampling indexing strategy, the Fund will not fully replicate the Underlying Index and may hold securities not included in the Underlying Index. As a result, the Fund is subject to the risk that BFA’s investment strategy, the implementation of which is subject to a number of constraints, may not produce the intended results.

Table of Contents

Market Risk. The Fund could lose money over short periods due to short-term market movements and over longer periods during more prolonged market downturns. Market risk arises mainly from uncertainty about future values of financial instruments and volatility in spot prices and may be influenced by price, currency and interest rate movements. It represents the potential loss the Fund may suffer through holding financial instruments in the face of market movements or uncertainty. The value of a security or other asset may decline due to changes in general market conditions, economic trends or events that are not specifically related to the issuer of the security or other asset, or factors that affect a particular issuer or issuers, country, group of countries, region, market, industry, group of industries, sector or asset class. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund and its investments and could result in increased premiums or discounts to the Fund’s NAV. During a general market downturn the prices of securities, commodities, and multiple other asset classes may be negatively affected. Changes in market conditions and interest rates generally do not have the same impact on all types of securities, commodities and other instruments.

Market Trading Risk.

Absence of Active Market. Although shares of the Fund are listed for trading on one or more stock exchanges, there can be no assurance that an active trading market for such shares will develop or be maintained by market makers or Authorized Participants.

Risk of Secondary Listings. The Fund's shares may be listed or traded on U.S. and non-U.S. stock exchanges other than the U.S. stock exchange where the Fund's primary listing is maintained, and may otherwise be made available to non-U.S. investors through funds or structured investment vehicles similar to depositary receipts. There can be no assurance that the Fund’s shares will continue to trade on any such stock exchange or in any market or that the Fund’s shares will continue to meet the requirements for listing or trading on any exchange or in any market. The Fund's shares may be less actively traded in certain markets than in others, and investors are subject to the execution and settlement risks and market standards of the market where they or their broker direct their trades for execution. Certain information available to investors who trade Fund shares on a U.S. stock exchange during regular U.S. market hours may not be available to investors who trade in other markets, which may result in secondary market prices in such markets being less efficient.

Secondary Market Trading Risk. Shares of the Fund may trade in the secondary market at times when the Fund does not accept orders to purchase or redeem shares. At such times, shares may trade in the secondary market with more significant premiums or discounts than might be experienced at times when the Fund accepts purchase and redemption orders.

Secondary market trading in Fund shares may be halted by a stock exchange because of market conditions or for other reasons. In addition, trading in Fund shares on a stock exchange or in any market may be subject to trading halts caused by extraordinary market volatility pursuant to “circuit breaker” rules on the stock exchange or market.

Table of Contents

Shares of the Fund, similar to shares of other issuers listed on a stock exchange, may be sold short and are therefore subject to the risk of increased volatility and price decreases associated with being sold short. In addition, trading activity in derivative products based on the Fund may lead to increased trading volume and volatility in the secondary market for the shares of the Fund.

Shares of the Fund May Trade at Prices Other Than NAV. Shares of the Fund trade on stock exchanges at prices at, above or below the Fund’s most recent NAV. The NAV of the Fund is calculated at the end of each business day and fluctuates with changes in the market value of the Fund’s holdings. The trading price of the Fund's shares fluctuates continuously throughout trading hours based on both market supply of and demand for Fund shares and the underlying value of the Fund's portfolio holdings or NAV. As a result, the trading prices of the Fund’s shares may deviate significantly from NAV during periods of market volatility, including during periods of significant redemption requests or other unusual market conditions. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV. However, because shares can be created and redeemed in Creation Units at NAV, BFA believes that large discounts or premiums to the NAV of the Fund are not likely to be sustained over the long term (unlike shares of many closed-end funds, which frequently trade at appreciable discounts from, and sometimes at premiums to, their NAVs). While the creation/redemption feature is designed to make it more likely that the Fund’s shares normally will trade on stock exchanges at prices close to the Fund’s next calculated NAV, exchange prices are not expected to correlate exactly with the Fund's NAV due to timing reasons, supply and demand imbalances and other factors. In addition, disruptions to creations and redemptions, including disruptions at market makers, Authorized Participants, or other market participants, and during periods of significant market volatility, may result in trading prices for shares of the Fund that differ significantly from its NAV. Authorized Participants may be less willing to create or redeem Fund shares if there is a lack of an active market for such shares or its underlying investments, which may contribute to the Fund’s shares trading at a premium or discount to NAV.

Costs of Buying or Selling Fund Shares. Buying or selling Fund shares on an exchange involves two types of costs that apply to all securities transactions. When buying or selling shares of the Fund through a broker, you will likely incur a brokerage commission and other charges. In addition, you may incur the cost of the “spread”; that is, the difference between what investors are willing to pay for Fund shares (the “bid” price) and the price at which they are willing to sell Fund shares (the “ask” price). The spread, which varies over time for shares of the Fund based on trading volume and market liquidity, is generally narrower if the Fund has more trading volume and market liquidity and wider if the Fund has less trading volume and market liquidity. In addition, increased market volatility may cause wider spreads. There may also be regulatory and other charges that are incurred as a result of trading activity. Because of the costs inherent in buying or selling Fund shares, frequent trading may detract significantly from investment results and an investment in Fund shares may not be advisable for investors who anticipate regularly making small investments through a brokerage account.

Table of Contents

Money Market Instruments Risk. The value of money market instruments may be affected by changing interest rates and by changes in the credit ratings of the investments. If a significant amount of the Fund's assets are invested in money market instruments, it will be more difficult for the Fund to achieve its investment objective. An investment in a money market fund is not insured or guaranteed by the FDIC or any other government agency. It is possible to lose money by investing in a money market fund. Money market funds other than government money market funds or retail money market funds “float” their NAV instead of using a stable $1.00 per share price.

Non-Diversification Risk. The Fund is classified as “non-diversified.” This means that the Fund may invest a large percentage of its assets in securities issued by or representing a small number of issuers or in derivatives with a limited number of counterparties. As a result, the Fund may be more susceptible to the risks associated with these particular issuers or counterparties or to a single economic, political or regulatory occurrence affecting these issuers or counterparties.

Non-U.S. Issuers Risk. Securities issued by non-U.S. issuers have different risks from securities issued by U.S. issuers. These risks include differences in accounting, auditing and financial reporting standards, the possibility of expropriation or confiscatory taxation, adverse changes in investment or exchange control regulations, political instability which could affect U.S. investments in non-U.S. countries, uncertainties of transnational litigation, and potential restrictions on the flow of international capital, including the possible seizure or nationalization of the securities issued by non-U.S. issuers held by the Fund. Non-U.S. issuers may be subject to less governmental regulation than U.S. issuers. Moreover, individual non-U.S. economies may differ favorably or unfavorably from the U.S. economy in such respects as growth of gross domestic product, rate of inflation, capital reinvestment, resource self-sufficiency and balance of payment positions. Unfavorable political, economic or governmental developments in non-U.S. countries could affect the payment of a security’s principal and interest. Securities issued by non-U.S. issuers may also be less liquid than, and more difficult to value than, securities of U.S. issuers. In addition, the value of these securities may fluctuate due to changes in the exchange rate of the issuer’s local currency against the U.S. dollar.

Operational Risk. The Fund is exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund's service providers, counterparties or other third parties, failed or inadequate processes and technology or systems failures. The Fund and BFA seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

Passive Investment Risk. The Fund is not actively managed and may be affected by a general decline in market segments related to the Underlying Index. The Fund invests in securities included in, or representative of, the Underlying Index, regardless of their investment merits. BFA generally does not attempt to invest the Fund's assets in defensive positions under any market conditions, including declining markets.

Risk of Investing in Agriculture and Livestock. The agricultural and livestock sectors are subject to government subsidy policies and environmental, health and

Table of Contents

safety laws and regulations. Specific governmental policies, such as taxes, tariffs, duties, subsidies and import and export restrictions on agricultural commodities, commodity products and livestock, can influence the profitability of investing in agriculture and livestock. Import restrictions and tariffs that have recently been imposed by foreign countries on U.S. agricultural and livestock products are expected to negatively impact the profitability of investing in these products. These industries may also be adversely affected by changes in commercial and consumer demand for their products. A growing competitive landscape and increased availability of such commodities can influence: (i) the planting and raising of certain crops/livestock versus other uses of resources; (ii) the location and size of crop and livestock production; (iii) whether unprocessed or processed commodity products are traded; and (iv) the volume and types of imports and exports. Economic recession or labor difficulties may also lead to a decrease in demand for the products and services involved in agriculture. As a result, the price of agricultural or livestock commodities could decline, which would affect the performance of the Fund.

The agricultural and livestock sectors also are particularly sensitive to changing weather conditions, such as floods or droughts, natural disasters and other factors, such as disease outbreaks and pollution.

Risk of Investing in Developed Countries. Investment in developed country issuers may subject the Fund to regulatory, political, currency, security, economic and other risks associated with developed countries. Developed countries generally tend to rely on services sectors (e.g., the financial services sector) as the primary means of economic growth. A prolonged slowdown in one or more services sectors is likely to have a negative impact on economies of certain developed countries, although economies of individual developed countries can be impacted by slowdowns in other sectors. In the past, certain developed countries have been targets of terrorism, and some geographic areas in which the Fund invests have experienced strained international relations due to territorial disputes, historical animosities, defense concerns and other security concerns. These situations may cause uncertainty in the financial markets in these countries or geographic areas and may adversely affect the performance of the issuers to which the Fund has exposure. Heavy regulation of certain markets, including labor and product markets, may have an adverse effect on certain issuers. Such regulations may negatively affect economic growth or cause prolonged periods of recession. Many developed countries are heavily indebted and face rising healthcare and retirement expenses. In addition, price fluctuations of certain commodities and regulations impacting the import of commodities may negatively affect developed country economies.

Risk of Investing in the U.S. A decrease in imports or exports, changes in trade regulations and/or an economic recession in the U.S. may have a material adverse effect on the U.S. economy and the securities listed on U.S. exchanges. Proposed and adopted policy and legislative changes in the U.S. are changing many aspects of financial, commercial, public health, environmental, and other regulation and may have a significant effect on U.S. markets generally, as well as on the value of certain securities. Governmental agencies project that the U.S. will continue to maintain elevated public debt levels for the foreseeable future. Although elevated debt levels do

Table of Contents

not necessarily indicate or cause economic problems, elevated public debt service costs may constrain future economic growth.

The U.S. has developed increasingly strained relations with a number of foreign countries. If relations with certain countries deteriorate, it could adversely affect U.S. issuers as well as non-U.S. issuers that rely on the U.S. for trade. The U.S. has also experienced increased internal unrest and discord, as well as significant challenges in managing and containing the outbreak of COVID-19. If these trends were to continue, it may have an adverse impact on the U.S. economy and the issuers in which the Fund invests.

Risk of Swap Agreements. Swaps can involve greater risks than direct investment in securities or physical commodities because swaps may be leveraged and are subject to counterparty risk (e.g., the risk of a counterparty defaulting on the obligation or bankruptcy), credit risk and pricing risk (i.e., swaps may be difficult to value). Swaps may be subject to illiquidity risk, and it may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses. Certain standardized interest rate and credit default swaps are required to be traded on an exchange or trading platform and centrally cleared. Most other swaps are entered into on a negotiated, bi-lateral basis and traded in the over-the-counter market. Swaps are subject to bi-lateral variation margin. Initial margin requirements are in the process of being phased in, and the Fund may be subject to such requirements as early as September 2022. These requirements may raise the costs for the Fund’s investment in swaps. Central clearing is expected to reduce counterparty credit risk and increase liquidity, but central clearing does not make swap transactions risk-free. Swaps entered into by the Fund through its Subsidiary are not expected to be centrally cleared and thus will expose the Fund to counter-party default risk and illiquidity risk, as liquidity depends on the willingness of counterparties to enter into, and the ability of counterparties to hedge the risks of, such contracts. All swaps require posting of collateral, which may restrict the ability of the Fund to invest the assets in different ways and which involve costs to the Fund. Swaps provide customized contractual terms, which may not, in all cases, provide the hedging or other intended benefits.

Structural Risk. Certain political, economic, legal and currency risks could contribute to a high degree of price volatility in the equity markets of some of the countries in which the Fund may invest and could adversely affect investments in the Fund.

Political and Social Risk. Disparities of wealth, the pace and success of democratization and ethnic, religious and racial disaffection, among other factors, may exacerbate social unrest, violence and labor unrest in some of the countries in which the Fund may invest. Unanticipated or sudden political or social developments may result in sudden and significant investment losses.

Economic Risk. Some countries in which the Fund may invest may experience economic instability, including instability resulting from substantial rates of inflation or significant devaluations of their currency, or economic recessions, which would have a negative effect on the economies and securities markets of their economies. Some of these countries may also impose restrictions on the exchange or export of currency or adverse currency exchange rates and may be characterized by a lack of available

Table of Contents

currency hedging instruments.

Expropriation Risk. Investments in certain countries in which the Fund may invest may be subject to loss due to expropriation or nationalization of assets and property or the imposition of restrictions on foreign investments and repatriation of capital.

Large Government Debt Risk. Chronic structural public sector deficits in some countries in which the Fund may invest may adversely impact securities held by the Fund.

Subsidiary Risk. In compliance with Subchapter M of the Internal Revenue Code, the Fund may invest up to 25% of its total assets in the Subsidiary, as determined at the end of each of the Fund’s fiscal quarters. By investing in a Subsidiary, the Fund is indirectly exposed to the risks associated with the Subsidiary’s investments. The swaps and Commodity Investments that may be held by the Subsidiary are subject to the same risks that apply to similar investments if held directly by the Fund. There can be no assurance that the investment objective of the Subsidiary will be achieved. The Subsidiary is not registered under the 1940 Act, and, unless otherwise noted in the Prospectus, is not subject to the investor protections of the 1940 Act. The Trust’s Board of Trustees (the “Board”) has oversight responsibility for the investment activities of the Fund, including its investment in the Subsidiary, and the Fund’s role as sole shareholder of the Subsidiary. The Subsidiary’s financial statements are consolidated with the Fund’s financial statements that are included in the Fund’s Annual and Semi-Annual Reports to shareholders.

Tax Risk. The Fund invests in commodity-linked derivatives indirectly through the Subsidiary because income from these investments, if made directly, might not be treated as “qualifying income” for purposes of the Fund qualifying as a RIC for U.S. federal income tax purposes. Based on final regulations issued by the IRS on which taxpayers may rely for taxable years beginning after September 28, 2016, the Fund expects its income with respect to the Subsidiary to be qualifying income. In the future, if the IRS issues new regulations or other guidance, or Congress enacts legislation, limiting the circumstances in which the Fund’s income with respect to the Subsidiary will be considered “qualifying income,” the Fund might be required to make changes to its operations, which could reduce the Fund’s ability to gain investment exposure to commodities. Fund shareholders could also experience adverse tax consequences in such circumstances. Moreover, changes in the laws of the U.S. and/or the Cayman Islands could result in the inability of the Fund and/or Subsidiary to operate as described in the Prospectus and in the SAI, and could adversely affect the Fund. For example, the Cayman Islands does not currently impose any income, corporate or capital gains taxes, estate duty, inheritance tax, gift tax or withholding tax on the Subsidiary. If Cayman Islands law changes such that the Subsidiary must pay Cayman Islands taxes, Fund shareholders would likely experience decreased investment returns.

Table of Contents

market close and the Fund's valuation of a security at the time of calculation of the Fund's NAV), transaction costs incurred by the Fund, the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be heightened during times of increased market volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX ETFs THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN FUTURES CONTRACTS ISSUERS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

Valuation Risk. The price the Fund could receive upon the sale of a security or other asset may differ from the Fund's valuation of the security or other asset, particularly for securities or other assets that trade in low volume or volatile markets or that are valued using a fair value methodology as a result of trade suspensions or for other reasons. Because non-U.S. exchanges may be open on days when the Fund does not price its shares, the value of the securities or other assets in the Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund’s shares. Authorized Participants who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

A Further Discussion of Other Risks

The Fund may also be subject to certain other risks associated with its investments and investment strategies. The order of the below risk factors does not indicate the significance of any particular risk factor.

Close-Out Risk for Qualified Financial Contracts. Regulations adopted by global prudential regulators require counterparties that are part of U.S. or foreign global systemically important banking organizations to include contractual restrictions on close-out and cross-default in agreements relating to qualified financial contracts. Qualified financial contracts include agreements relating to swaps, currency forwards and other derivatives as well as repurchase agreements and securities lending agreements. The restrictions prevent the Fund from closing out a qualified financial contract during a specified time period if the counterparty is subject to resolution proceedings and also prohibit the Fund from exercising default rights due to a receivership or similar proceeding of an affiliate of the counterparty. These requirements may increase credit risk and other risks to the Fund.

North American Economic Risk. A decrease in imports or exports, changes in trade regulations or an economic recession in any North American country can have a significant economic effect on the entire North American region and on some or all of the North American countries in which the Fund invests.

Table of Contents

The U.S. is Canada's and Mexico's largest trading and investment partner. The Canadian and Mexican economies are significantly affected by developments in the U.S. economy. Since the implementation of the North American Free Trade Agreement (“NAFTA”) in 1994 among Canada, the U.S. and Mexico, total merchandise trade among the three countries has increased. However, political developments including the implementation of tariffs by the U.S. and the renegotiation of NAFTA in the form of the United States-Mexico-Canada Agreement (“USMCA”), which replaced NAFTA on July 1, 2020, could negatively affect North America’s economic outlook and, as a result, the value of securities held by the Fund. Policy and legislative changes in one country may have a significant effect on North American markets generally, as well as on the value of certain securities held by the Fund.

Risk of Investing in Gold. The Fund has exposure to gold through its investments in total return swaps on the Underlying Index. Thus, the Fund’s portfolio may be adversely affected by changes or trends in the price of gold. The price of gold and of gold-related instruments historically has been volatile. Governments, central banks, or other large holders can influence the production and sale of gold, which may adversely affect the supply and price of gold, and thus, the performance of the Fund. Unpredictable economic, financial, social, and political factors may also affect the price of gold.

Investments related to gold are considered to be speculative. The price of gold may fluctuate sharply over short periods of time due to, among other things: (i) changes in inflation or expectations regarding inflation in various countries; (ii) the availability of supply; (iii) changes in demand; (iv) investment speculation and political uncertainty; and (v) monetary and other economic policies of various governments.

Risk of Investing in Industrial Metals. The price of industrial metals may be adversely affected by unpredictable international economic and political policies, such as currency devaluations or revaluations, economic and social conditions within an individual country, trade imbalances, or trade or currency restrictions between countries. As a result, the price of industrial metals historically has been subject to substantial price fluctuations over short periods of time.

This sector also could be adversely affected by changes in exchange rates and inflation, imposition of import controls, increased competition, and changes in industrial and commercial demand for industrial metals as the principal supplies of metal industries may be concentrated in a small number of countries and regions.

Risk of Investing in Precious Metals. Prices of precious metals and of precious metal-related financial instruments historically have been very volatile. The high volatility of precious metal prices may adversely affect the prices of financial instruments that derive their value from the price of underlying precious metals. The production and sale of precious metals by governments, central banks or other larger holders can be affected by various economic, financial, social and political factors, which may be unpredictable and may have a significant impact on the prices of precious metals. Other factors that may affect the prices of precious metal-related financial instruments include changes in inflation, the outlook for inflation and changes in industrial and commercial demand for precious metals.

Table of Contents

Some precious metals mining operation companies may hedge, to varying degrees, their exposure to declines in precious metals prices by selling forward future production. This may affect prices of precious metals-related financial instruments, which in turn may limit the Fund’s ability to benefit from future increases in the price of precious metals, thereby lowering returns to the Fund.

Additionally, increased environmental or labor costs may depress the value of mining and metal investments.

Threshold/Underinvestment Risk. If certain aggregate and/or fund-level ownership thresholds are reached through transactions undertaken by BFA, its affiliates or the Fund, or as a result of third-party transactions or actions by an issuer or regulator, the ability of BFA and its affiliates on behalf of clients (including the Fund) to purchase or dispose of investments, or exercise rights or undertake business transactions, may be restricted by regulation or otherwise impaired. The capacity of the Fund to make investments in certain securities, and derivatives such as options, swaps, and futures, may be affected by the relevant threshold limits, and such limitations may have adverse effects on the liquidity and performance of the Fund’s portfolio holdings including derivatives such as options, swaps and futures.

For example, in certain circumstances where the Fund invests in securities issued by companies that operate in certain regulated industries or in certain emerging or international markets, is subject to corporate or regulatory ownership restrictions, or invests in certain futures or other derivative transactions, there may be limits on the aggregate and/or fund-level amount invested or voted by BFA and its affiliates for their proprietary accounts and for client accounts (including the Fund) that may not be exceeded without the grant of a license or other regulatory or corporate consent or, if exceeded, may cause BFA and its affiliates, the Fund or other client accounts to suffer disadvantages or business restrictions.

Portfolio Holdings Information

A description of the Trust's policies and procedures with respect to the disclosure of the Fund’s portfolio securities and other assets is available in the Fund's SAI. The Fund discloses its portfolio holdings daily at www.iShares.com. Fund fact sheets provide information regarding the Fund's top holdings and may be requested by calling 1-800-iShares (1-800-474-2737).

Management

Investment Adviser. As investment adviser, BFA has overall responsibility for the general management and administration of the Fund. BFA provides an investment program for the Fund and manages the investment of the Fund’s assets. In managing the Fund, BFA may draw upon the trading, research and expertise of its asset management affiliates for portfolio decisions and management with respect to portfolio securities and other assets. In seeking to achieve the Fund's investment objective, BFA uses teams of portfolio managers, investment strategists and other investment specialists. This team approach brings together many disciplines and leverages BFA’s extensive resources.

Table of Contents

Pursuant to the Investment Advisory Agreement between BFA and the Trust (entered into on behalf of the Fund), BFA is responsible for substantially all expenses of the Fund, except the management fees, interest expenses, taxes, expenses incurred with respect to the acquisition and disposition of portfolio securities, commodities or other financial instruments and the execution of portfolio transactions, including brokerage commissions, distribution fees or expenses, and litigation expenses and any extraordinary expenses (as determined by a majority of the Trustees who are not “interested persons” of the Trust). For the avoidance of doubt, extraordinary expenses do not include expenses related to the organization of any subsidiary for the Fund or the ongoing corporate expenses of maintaining such subsidiary.

For its investment advisory services to the Fund, BFA is paid a management fee from the Fund based on a percentage of the Fund's average daily net assets, at the annual rate of 0.28%. BFA also serves as investment adviser to the Subsidiary. No fee will be paid to BFA for the advisory services that it provides to the Subsidiary. BFA has contractually agreed to waive a portion of its management fees in an amount equal to the Acquired Fund Fees and Expenses, if any, attributable to investments by the Fund in other funds advised by BFA, or its affiliates, through February 28, 2025. The contractual waiver may be terminated prior to February 28, 2025 only upon written agreement of the Trust and BFA. In addition, BFA may from time to time voluntarily waive and/or reimburse fees or expenses in order to limit total annual fund operating expenses (excluding acquired fund fees and expenses, if any). Any such voluntary waiver or reimbursement may be eliminated by BFA at any time.

BFA is located at 400 Howard Street, San Francisco, CA 94105. It is an indirect wholly-owned subsidiary of BlackRock, Inc. (“BlackRock”). As of December 31, 2021, BFA and its affiliates provided investment advisory services for assets in excess of $10.01 trillion. BFA and its affiliates trade and invest for their own accounts in the actual securities and types of securities in which the Fund may also invest, which may affect the price of such securities. BFA is considered a “commodity pool operator” with respect to the Fund under the CEA and is therefore subject to regulation by the SEC and the CFTC with respect to the Fund.

A discussion regarding the basis for the approval by the Board of the Investment Advisory Agreement with BFA is available in the Fund's Annual Report for the period ended October 31.

From time to time, a manager, analyst, or other employee of BlackRock or its affiliates may express views regarding a particular asset class, company, security, industry, or market sector. The views expressed by any such person are the views of only that individual as of the time expressed and do not necessarily represent the views of BlackRock or any other person within the BlackRock organization. Any such views are subject to change at any time based upon market or other conditions and BlackRock disclaims any responsibility to update such views. These views may not be relied on as investment advice and may not be relied on as an indication of trading intent on behalf of the Fund.

Table of Contents

including, but not limited to, developing and implementing the Fund’s investment process and investment strategy, researching and reviewing investment strategy and overseeing members of his portfolio management team that have more limited responsibilities.

Richard Mejzak has been with BlackRock since 1990, including his years with Merrill Lynch Investment Managers, which was acquired by BlackRock in 2006. Mr. Mejzak became a portfolio manager for BFA in 2012. Mr. Mejzak has been a Portfolio Manager of the Fund since 2018.

Greg Savage has been employed by BFA or its affiliates as a senior portfolio manager since 2006. Prior to that, Mr. Savage was a portfolio manager from 2001 to 2006 for Barclays Global Fund Advisors (“BGFA”). Mr. Savage has been a Portfolio Manager of the Fund since 2018.

Paul Whitehead has been with BlackRock since 1996, including his years with Barclays Global Investors (“BGI”), which merged with BlackRock in 2009. Mr. Whitehead has been employed by BlackRock as a Managing Director since 2010 and a Director from 2009 to 2010. Mr. Whitehead was employed by BGI as Principal from 2002 to 2009. Mr. Whitehead has been a Portfolio Manager of the Fund since 2022.

Amy Whitelaw has been with BlackRock since 1999, including her years with BGI, which merged with BlackRock in 2009. Ms. Whitelaw has been employed by BFA or its affiliates as a portfolio manager since 2009 and has been a Portfolio Manager of the Fund since 2019.

The Fund's SAI provides additional information about the Portfolio Managers' compensation, other accounts managed by the Portfolio Managers and the Portfolio Managers' ownership (if any) of shares in the Fund.

Administrator, Custodian and Transfer Agent. State Street Bank and Trust Company (“State Street”) is the administrator, custodian and transfer agent for the Fund.

Table of Contents

in issuances (such as structured notes) by entities for which an Affiliate provides and is compensated for cash management services relating to the proceeds from the sale of such issuances. The Fund also may invest in securities of, or engage in other transactions with, companies for which an Affiliate provides or may in the future provide research coverage. An Affiliate may have business relationships with, and purchase or distribute or sell services or products from or to, distributors, consultants or others who recommend the Fund or who engage in transactions with or for the Fund, and may receive compensation for such services. BFA or one or more Affiliates may engage in proprietary trading and advise accounts and funds that have investment objectives similar to those of the Fund and/or that engage in and compete for transactions in the same types of securities, currencies and other instruments as the Fund. This may include transactions in securities issued by other open-end and closed-end investment companies (which may include investment companies that are affiliated with the Fund and BFA, to the extent permitted under the 1940 Act). The trading activities of BFA and these Affiliates are carried out without reference to positions held directly or indirectly by the Fund and may result in BFA or an Affiliate having positions in certain securities that are senior or junior to, or have interests different from or adverse to, the securities that are owned by the Fund.

Neither BlackRock nor any Affiliate is under any obligation to share any investment opportunity, idea or strategy with the Fund. As a result, an Affiliate may compete with the Fund for appropriate investment opportunities. The results of the Fund's investment activities, therefore, may differ from those of an Affiliate and of other accounts managed by BlackRock or an Affiliate, and it is possible that the Fund could sustain losses during periods in which one or more Affiliates and other accounts achieve profits on their trading for proprietary or other accounts. The opposite result is also possible.

In addition, the Fund may, from time to time, enter into transactions in which BFA or an Affiliate or its or their directors, officers, employees or clients have an adverse interest. Furthermore, transactions undertaken by clients advised or managed by BFA or its Affiliates may adversely impact the Fund. Transactions by one or more clients or by BFA or its Affiliates or their directors, officers or employees may have the effect of diluting or otherwise disadvantaging the values, prices or investment strategies of the Fund.

The Fund's activities may be limited because of regulatory restrictions applicable to BFA or one or more Affiliates and/or their internal policies designed to comply with such restrictions.

It is also possible that, from time to time, BlackRock and/or its advisory clients (including other funds and separately managed accounts) may, subject to compliance with applicable law, purchase and hold shares of the Fund. The price, availability, liquidity, and (in some cases) expense ratio of the Fund may be impacted by purchases and sales of the Fund by BlackRock and/or its advisory clients.

The activities of BFA and its Affiliates and their respective directors, officers or employees may give rise to other conflicts of interest that could disadvantage the Fund and its shareholders. BFA has adopted policies and procedures designed to address these potential conflicts of interest. See the SAI for further information.

Table of Contents

Shareholder Information

Additional shareholder information, including how to buy and sell shares of the Fund, is available free of charge by calling toll-free: 1-800-iShares (1-800-474-2737) or visiting our website at www.iShares.com.

Buying and Selling Shares. Shares of the Fund may be acquired or redeemed directly from the Fund only in Creation Units or multiples thereof, as discussed in the Creations and Redemptions section of this Prospectus. Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund. Once created, shares of the Fund generally trade in the secondary market in amounts less than a Creation Unit.

Shares of the Fund are listed on a national securities exchange for trading during the trading day. Shares can be bought and sold throughout the trading day like shares of other publicly-traded companies. The Trust does not impose any minimum investment for shares of the Fund purchased on an exchange or otherwise in the secondary market. The Fund's shares trade under the ticker symbol “CMDY.”

Buying or selling Fund shares on an exchange or other secondary market involves two types of costs that may apply to all securities transactions. When buying or selling shares of the Fund through a broker, you may incur a brokerage commission and other charges. The commission is frequently a fixed amount and may be a significant proportional cost for investors seeking to buy or sell small amounts of shares. In addition, you may incur the cost of the “spread,” that is, any difference between the bid price and the ask price. The spread varies over time for shares of the Fund based on the Fund’s trading volume and market liquidity, and is generally lower if the Fund has high trading volume and market liquidity, and higher if the Fund has little trading volume and market liquidity (which is often the case for funds that are newly launched or small in size). The Fund's spread may also be impacted by the liquidity or illiquidity of the underlying securities or other assets held by the Fund, particularly for newly launched or smaller funds or in instances of significant volatility of the underlying securities or other assets.

The Board has adopted a policy of not monitoring for frequent purchases and redemptions of Fund shares (“frequent trading”) that appear to attempt to take advantage of a potential arbitrage opportunity presented by a lag between a change in the value of the Fund’s portfolio securities and other assets after the close of the primary markets for the Fund’s portfolio securities or assets and the reflection of that change in the Fund’s NAV (“market timing”), because the Fund sells and redeems its shares directly through transactions that are in-kind and/or for cash, subject to the conditions described below under Creations and Redemptions. The Board has not adopted a policy of monitoring for other frequent trading activity because shares of the Fund are listed for trading on a national securities exchange.

Table of Contents

Presidents’ Day, Good Friday, Memorial Day, Juneteenth, Independence Day, Labor Day, Thanksgiving Day and Christmas Day. The Fund’s primary listing exchange is NYSE Arca.

Section 12(d)(1) of the 1940 Act generally restricts investments by investment companies, including foreign and unregistered investment companies, in the securities of other investment companies. For example, a registered investment company (the “Acquired Fund”), such as the Fund, may not knowingly sell or otherwise dispose of any security issued by the Acquired Fund to any investment company (the “Acquiring Fund”) or any company or companies controlled by the Acquiring Fund if, immediately after such sale or disposition: (i) more than 3% of the total outstanding voting stock of the Acquired Fund is owned by the Acquiring Fund and any company or companies controlled by the Acquiring Fund, or (ii) more than 10% of the total outstanding voting stock of the Acquired Fund is owned by the Acquiring Fund and other investment companies and companies controlled by them. However, registered investment companies are permitted to invest in the Fund beyond the limits set forth in Section 12(d)(1), subject to certain terms and conditions set forth in SEC rules. In order for a registered investment company to invest in shares of the Fund beyond the limitations of Section 12(d)(1) in reliance on Rule 12d1-4 under the 1940 Act, the registered investment company must, among other things, enter into an agreement with the Trust. Foreign investment companies are permitted to invest in the Fund only up to the limits set forth in Section 12(d)(1), subject to any applicable SEC no-action relief.

Book Entry. Shares of the Fund are held in book-entry form, which means that no stock certificates are issued. The Depository Trust Company (“DTC”) or its nominee is the record owner of, and holds legal title to, all outstanding shares of the Fund.

Investors owning shares of the Fund are beneficial owners as shown on the records of DTC or its participants. DTC serves as the securities depository for shares of the Fund. DTC participants include securities brokers and dealers, banks, trust companies, clearing corporations and other institutions that directly or indirectly maintain a custodial relationship with DTC. As a beneficial owner of shares, you are not entitled to receive physical delivery of stock certificates or to have shares registered in your name, and you are not considered a registered owner of shares. Therefore, to exercise any right as an owner of shares, you must rely upon the procedures of DTC and its participants. These procedures are the same as those that apply to any other securities that you hold in book-entry or “street name” form.

Share Prices. The trading prices of the Fund’s shares in the secondary market generally differ from the Fund’s daily NAV and are affected by market forces such as the supply of and demand for ETF shares and underlying securities or assets held by the Fund, economic conditions and other factors.

Table of Contents

dividing the value of the net assets of the Fund (i.e., the value of its total assets less total liabilities) by the total number of outstanding shares of the Fund, generally rounded to the nearest cent.

The value of the securities and other assets and liabilities held by the Fund is determined pursuant to valuation policies and procedures approved by the Board.

The Fund values fixed-income portfolio securities using last available bid prices or current market quotations provided by dealers or prices (including evaluated prices) supplied by the Fund's approved independent third-party pricing services, each in accordance with valuation policies and procedures approved by the Board. Pricing services may use matrix pricing or valuation models that utilize certain inputs and assumptions to derive values. Pricing services generally value fixed-income securities assuming orderly transactions of an institutional round lot size, but the Fund may hold or transact in such securities in smaller odd lot sizes. Odd lots often trade at lower prices than institutional round lots. An amortized cost method of valuation may be used with respect to debt obligations with sixty days or less remaining to maturity unless BFA determines in good faith that such method does not represent fair value.

Generally, trading in non-U.S. securities and money market instruments is substantially completed each day at various times prior to the close of regular trading hours of the NYSE. The values of such securities and other assets used in computing the NAV of the Fund are determined as of such times.

When market quotations are not readily available or are believed by BFA to be unreliable, the Fund’s investments are valued at fair value. Fair value determinations are made by BFA in accordance with policies and procedures approved by the Board. BFA may conclude that a market quotation is not readily available or is unreliable if a security or other asset or liability does not have a price source due to its lack of trading or other reasons, if a market quotation differs significantly from recent price quotations or otherwise no longer appears to reflect fair value, where the security or other asset or liability is thinly traded, when there is a significant event subsequent to the most recent market quotation, or if the trading market on which a security is listed is suspended or closed and no appropriate alternative trading market is available. A “significant event” is deemed to occur if BFA determines, in its reasonable business judgment prior to or at the time of pricing the Fund’s assets or liabilities, that the event is likely to cause a material change to the last exchange closing price or closing market price of one or more assets held by, or liabilities of, the Fund.

Fair value represents a good faith approximation of the value of an asset or liability. The fair value of an asset or liability held by the Fund is the amount the Fund might reasonably expect to receive from the current sale of that asset or the cost to extinguish that liability in an arm’s-length transaction. Valuing the Fund’s investments using fair value pricing will result in prices that may differ from current market valuations and that may not be the prices at which those investments could have been sold during the period in which the particular fair values were used. Use of fair value prices and certain current market valuations could result in a difference between the prices used to calculate the Fund’s NAV and the prices used by the Underlying Index, which, in turn, could result in a difference between the Fund’s performance and the performance of the Underlying Index.

Table of Contents

Dividends and Distributions

General Policies. Dividends from net investment income, if any, generally are declared and paid at least once a year by the Fund. Distributions of net realized securities gains, if any, generally are declared and paid once a year, but the Trust may make distributions on a more frequent basis for the Fund. The Trust reserves the right to declare special distributions if, in its reasonable discretion, such action is necessary or advisable to preserve its status as a RIC or to avoid imposition of income or excise taxes on undistributed income or realized gains.

Dividends and other distributions on shares of the Fund are distributed on a pro rata basis to beneficial owners of such shares. Dividend payments are made through DTC participants and indirect participants to beneficial owners then of record with proceeds received from the Fund.

Dividend Reinvestment Service. No dividend reinvestment service is provided by the Trust. Broker-dealers may make available the DTC book-entry Dividend Reinvestment Service for use by beneficial owners of the Fund for reinvestment of their dividend distributions. Beneficial owners should contact their broker to determine the availability and costs of the service and the details of participation therein. Brokers may require beneficial owners to adhere to specific procedures and timetables. If this service is available and used, dividend distributions of both income and realized gains will be automatically reinvested in additional whole shares of the Fund purchased in the secondary market.

Taxes. As with any investment, you should consider how your investment in shares of the Fund will be taxed. The tax information in this Prospectus is provided as general information, based on current law. You should consult your own tax professional about the tax consequences of an investment in shares of the Fund.

Taxes on Distributions. Distributions from the Fund’s net investment income (other than qualified dividend income), including distributions out of the Fund’s net short-term capital gains, if any, are taxable to you as ordinary income. Distributions by the Fund of net long-term capital gains, if any, in excess of net short-term capital losses (capital gain dividends) are taxable to you as long-term capital gains, regardless of how long you have held the Fund’s shares. Distributions by the Fund that qualify as qualified dividend income are taxable to you at long-term capital gain rates. However, given the Fund's investment objective and strategies, the Fund generally does not expect its distributions to be treated as qualified dividend income. Long-term capital gains and qualified dividend income are generally eligible for taxation at a maximum rate of 15% or 20% for non-corporate shareholders, depending on whether their income exceeds certain threshold amounts. Because the Fund may have a higher portfolio turnover than funds that seek to replicate the performance of an index, the Fund may, in comparison to such other funds, realize and distribute a higher amount of taxable realized capital gain. In addition, a 3.8% U.S. federal Medicare contribution tax is

Table of Contents

imposed on “net investment income,” including, but not limited to, interest, dividends, and net gain, of U.S. individuals with income exceeding $200,000 (or $250,000 if married and filing jointly) and of estates and trusts.

In general, your distributions are subject to U.S. federal income tax for the year when they are paid. Certain distributions paid in January, however, may be treated as paid on December 31 of the prior year.

If the Fund’s distributions exceed current and accumulated earnings and profits, all or a portion of the distributions made in the taxable year may be recharacterized as a return of capital to shareholders. Distributions in excess of the Fund’s minimum distribution requirements, but not in excess of the Fund’s earnings and profits, will be taxable to shareholders and will not constitute nontaxable returns of capital. A return of capital distribution generally will not be taxable but will reduce the shareholder’s cost basis and result in a higher capital gain or lower capital loss when those shares on which the distribution was received are sold. Once a shareholder's cost basis is reduced to zero, further distributions will be treated as capital gain, if the shareholder holds shares of the Fund as capital assets.

Dividends, interest and capital gains earned by the Fund with respect to securities issued by non-U.S. issuers may give rise to withholding, capital gains and other taxes imposed by non-U.S. countries. Tax conventions between certain countries and the U.S. may reduce or eliminate such taxes. If more than 50% of the total assets of the Fund at the close of a year consists of non-U.S. stocks or securities (generally, for this purpose, depositary receipts, no matter where traded, of non-U.S. companies are treated as “non-U.S.”), generally the Fund may “pass through” to you certain non-U.S. income taxes (including withholding taxes) paid by the Fund. This means that you would be considered to have received as an additional dividend your share of such non-U.S. taxes, but you may be entitled to either a corresponding tax deduction in calculating your taxable income, or, subject to certain limitations, a credit in calculating your U.S. federal income tax.

For purposes of foreign tax credits for U.S. shareholders of the Fund, foreign capital gains taxes may not produce associated foreign source income, limiting the availability of such credits for U.S. persons.

If you are neither a resident nor a citizen of the U.S. or if you are a non-U.S. entity (other than a pass-through entity to the extent owned by U.S. persons), the Fund’s ordinary income dividends (which include distributions of net short-term capital gains) will generally be subject to a 30% U.S. withholding tax, unless a lower treaty rate applies, provided that withholding tax will generally not apply to any gain or income realized by a non-U.S. shareholder in respect of any distributions of long-term capital gains or upon the sale or other disposition of shares of the Fund.

Table of Contents

agreements with the IRS that state that they will provide the IRS information, including the names, addresses and taxpayer identification numbers of direct and indirect U.S. account holders, comply with due diligence procedures with respect to the identification of U.S. accounts, report to the IRS certain information with respect to U.S. accounts maintained, agree to withhold tax on certain payments made to non-compliant foreign financial institutions or to account holders who fail to provide the required information, and determine certain other information concerning their account holders, or (ii) in the event that an applicable intergovernmental agreement and implementing legislation are adopted, provide local revenue authorities with similar account holder information. Other foreign entities may need to report the name, address, and taxpayer identification number of each substantial U.S. owner or provide certifications of no substantial U.S. ownership unless certain exceptions apply.

If you are a resident or a citizen of the U.S., by law, backup withholding at a 24% rate will apply to your distributions and proceeds if you have not provided a taxpayer identification number or social security number and made other required certifications.

Taxes When Shares Are Sold. Currently, any capital gain or loss realized upon a sale of Fund shares is generally treated as a long-term gain or loss if the shares have been held for more than one year. Any capital gain or loss realized upon a sale of Fund shares held for one year or less is generally treated as short-term gain or loss, except that any capital loss on the sale of shares held for six months or less is treated as long-term capital loss to the extent that capital gain dividends were paid with respect to such shares. Any such capital gains, including from sales of Fund shares or from capital gain dividends, are included in “net investment income” for purposes of the 3.8% U.S. federal Medicare contribution tax mentioned above.

The foregoing discussion summarizes some of the consequences under current U.S. federal tax law of an investment in the Fund. It is not a substitute for personal tax advice. You may also be subject to state and local taxation on Fund distributions and sales of shares. Consult your personal tax advisor about the potential tax consequences of an investment in shares of the Fund under all applicable tax laws.

Creations and Redemptions. Prior to trading in the secondary market, shares of the Fund are “created” at NAV by market makers, large investors and institutions only in block-size Creation Units or multiples thereof. Each “creator” or authorized participant (an “Authorized Participant”) has entered into an agreement with the Fund's distributor, BlackRock Investments, LLC (the “Distributor”), an affiliate of BFA. An Authorized Participant is a member or participant of a clearing agency registered with the SEC, which has a written agreement with the Fund or one of its service providers that allows such member or participant to place orders for the purchase and redemption of Creation Units.

Table of Contents

assets or other positions (a “redemption basket”) held by the Fund and an amount of cash (including any portion of such securities for which cash may be substituted). The Fund may, in certain circumstances, offer Creation Units partially or solely for cash. Except when aggregated in Creation Units, shares are not redeemable by the Fund. Creation and redemption baskets may differ and the Fund may accept “custom baskets.” More information regarding custom baskets is contained in the Fund's SAI.

The prices at which creations and redemptions occur are based on the next calculation of NAV after a creation or redemption order is received in an acceptable form under the authorized participant agreement.

Only an Authorized Participant may create or redeem Creation Units with the Fund. Authorized Participants may create or redeem Creation Units for their own accounts or for customers, including, without limitation, affiliates of the Fund.

In the event of a system failure or other interruption, including disruptions at market makers or Authorized Participants, orders to purchase or redeem Creation Units either may not be executed according to the Fund's instructions or may not be executed at all, or the Fund may not be able to place or change orders.

To the extent the Fund engages in in-kind transactions, the Fund intends to comply with the U.S. federal securities laws in accepting securities for deposit and satisfying redemptions with redemption securities by, among other means, assuring that any securities accepted for deposit and any securities used to satisfy redemption requests will be sold in transactions that would be exempt from registration under the 1933 Act. Further, an Authorized Participant that is not a “qualified institutional buyer,” as such term is defined in Rule 144A under the 1933 Act, will not be able to receive restricted securities eligible for resale under Rule 144A.

Creations and redemptions must be made through a firm that is either a member of the Continuous Net Settlement System of the National Securities Clearing Corporation or a DTC participant that has executed an agreement with the Distributor with respect to creations and redemptions of Creation Unit aggregations. Information about the procedures regarding creation and redemption of Creation Units (including the cut-off times for receipt of creation and redemption orders) is included in the Fund's SAI.

Because new shares may be created and issued on an ongoing basis, at any point during the life of the Fund a “distribution,” as such term is used in the 1933 Act, may be occurring. Broker-dealers and other persons are cautioned that some activities on their part may, depending on the circumstances, result in their being deemed participants in a distribution in a manner that could render them statutory underwriters subject to the prospectus delivery and liability provisions of the 1933 Act. Any determination of whether one is an underwriter must take into account all the relevant facts and circumstances of each particular case.

Broker-dealers should also note that dealers who are not “underwriters” but are participating in a distribution (as contrasted to ordinary secondary transactions), and thus dealing with shares that are part of an “unsold allotment” within the meaning of Section 4(a)(3)(C) of the 1933 Act, would be unable to take advantage of the prospectus delivery exemption provided by Section 4(a)(3) of the 1933 Act. For delivery of prospectuses to exchange members, the prospectus delivery mechanism of

Table of Contents

Rule 153 under the 1933 Act is available only with respect to transactions on a national securities exchange.

Householding. Householding is an option available to certain Fund investors. Householding is a method of delivery, based on the preference of the individual investor, in which a single copy of certain shareholder documents can be delivered to investors who share the same address, even if their accounts are registered under different names. Please contact your broker-dealer if you are interested in enrolling in householding and receiving a single copy of prospectuses and other shareholder documents, or if you are currently enrolled in householding and wish to change your householding status.

Table of Contents

Distribution

The Distributor or its agent distributes Creation Units for the Fund on an agency basis. The Distributor does not maintain a secondary market in shares of the Fund. The Distributor has no role in determining the policies of the Fund or the securities that are purchased or sold by the Fund. The Distributor’s principal address is 1 University Square Drive, Princeton, NJ 08540.

BFA or its affiliates make payments to broker-dealers, registered investment advisers, banks or other intermediaries (together, “intermediaries”) related to marketing activities and presentations, educational training programs, conferences, the development of technology platforms and reporting systems, data provision services, or their making shares of the Fund and certain other iShares funds available to their customers generally and in certain investment programs. Such payments, which may be significant to the intermediary, are not made by the Fund. Rather, such payments are made by BFA or its affiliates from their own resources, which come directly or indirectly in part from fees paid by the iShares funds complex. Payments of this type are sometimes referred to as revenue-sharing payments. A financial intermediary may make decisions about which investment options it recommends or makes available, or the level of services provided, to its customers based on the payments or other financial incentives it is eligible to receive. Therefore, such payments or other financial incentives offered or made to an intermediary create conflicts of interest between the intermediary and its customers and may cause the intermediary to recommend the Fund or other iShares funds over another investment. More information regarding these payments is contained in the Fund's SAI. Please contact your salesperson or other investment professional for more information regarding any such payments his or her firm may receive from BFA or its affiliates.

Table of Contents

Financial Highlights

The financial highlights table is intended to help investors understand the Fund’s financial performance since inception. Certain information reflects financial results for a single share of the Fund. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in the Fund, assuming reinvestment of all dividends and distributions. This information has been audited by PricewaterhouseCoopers LLP, whose report is included, along with the Fund's financial statements, in the Fund's Annual Report (available upon request).

Financial Highlights
(For a share outstanding throughout each period)

	iShares Bloomberg Roll Select Commodity Strategy ETF
	Year Ended 10/31/21	Year Ended 10/31/20	Year Ended 10/31/19	Period From 04/03/18^(a) to 10/31/18
Net asset value, beginning of period	$41.91	$45.01	$47.77	$50.00
Net investment income (loss)^(b)	(0.09)	0.23	1.05	0.58
Net realized and unrealized gain (loss)^(c)	17.92	(2.33)	(3.05)	(2.81)
Net increase (decrease) from investment operations	17.83	(2.10)	(2.00)	(2.23)
Distributions^(d)
From net investment income	(0.07)	(1.00)	(0.76)	—
Total distributions	(0.07)	(1.00)	(0.76)	—
Net asset value, end of period	$59.67	$41.91	$45.01	$47.77
Total Return^(e)
Based on net asset value	42.59%	(4.81)%	(4.19)%	(4.46)%^(f)
Ratios to Average Net Assets
Total expenses	0.28%	0.28%	0.28%	0.28%^(g)
Total expenses after fees waived	0.27%	0.27%	0.19%	0.10%^(g)
Net investment income (loss)	(0.16)%	0.55%	2.30%	2.01%^(g)
Supplemental Data
Net assets, end of period (000)	$208,844	$41,912	$27,004	$40,607
Portfolio turnover rate^(h)	0%	0%	0%	0%^(f)
^(a) Commencement of operations.
^(b) Based on average shares outstanding.
^(c) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.
^(d) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.
^(e) Where applicable, assumes the reinvestment of distributions.
^(f) Not annualized.
^(g) Annualized.
^(h) Portfolio turnover rate excludes in-kind transactions.

Table of Contents

Disclaimers

Bloomberg and the Bloomberg Roll Select Commodity Total Return Index are trademarks or service marks of Bloomberg Index Services Limited and its affiliates (collectively, “Bloomberg”). Bloomberg or Bloomberg’s licensors own all proprietary right in the Bloomberg Commodity Roll Select Commodity Total Return Index. Bloomberg does not guarantee the timeliness, accuracy or completeness of any data or information relating to the Bloomberg Roll Select Commodity Total Return Index. Bloomberg makes no warranty, express or implied, as to the Bloomberg Roll Select Commodity Total Return Index or any data or values relating thereto or results to be obtained therefrom, and expressly disclaims all warranties of merchantability and fitness for a particular purpose with respect thereto. Bloomberg reserves the right to change the methods of calculation or publication, or to cease the calculation or publication, of the Bloomberg Roll Select Commodity Total Return Index, and Bloomberg shall not be liable for any miscalculation of or any incorrect, delayed or interrupted publication with respect to the Bloomberg Roll Select Commodity Total Return Index. It is not possible to invest directly in an index. Back-tested performance is not actual performance. To the maximum extent allowed by law, Bloomberg, its licensors, and its and their respective employees, contractors, agents, suppliers and vendors shall have no liability or responsibility whatsoever for any injury or damages - whether direct, indirect, consequential, incidental, punitive or otherwise - arising in connection with the Bloomberg Roll Select Commodity Total Return Index or any data or values relating thereto - whether arising from their negligence or otherwise. Nothing in Bloomberg Roll Select Commodity Total Return Index shall constitute or be construed as an offering of financial instruments or as investment advice or investment recommendations (i.e., recommendations as to whether or not to “buy,” “sell,” “hold,” or to enter or not to enter into any other transaction involving any specific interest or interests) by Bloomberg or its affiliates or a recommendation as to an investment or other strategy by Bloomberg or its affiliates. Data and other information available via the Bloomberg Roll Select Commodity Total Return Index should not be considered as information sufficient upon which to base an investment decision. All information provided by the Bloomberg Roll Select Commodity Total Return Index is impersonal and not tailored to the needs of any person, entity or group of persons. Bloomberg and its affiliates do not express an opinion on the future or expected value of any security or other interest and do not explicitly or implicitly recommend or suggest an investment strategy of any kind.

Table of Contents

of the timing of, prices of, or quantities of shares of the Fund to be issued, nor in the determination or calculation of the equation by which the shares are redeemable. NYSE Arca has no obligation or liability to owners of shares of the Fund in connection with the administration, marketing or trading of shares of the Fund.

NYSE Arca does not guarantee the accuracy and/or the completeness of the Underlying Index or any data included therein. NYSE Arca makes no warranty, express or implied, as to results to be obtained by the Trust on behalf of the Fund as licensee, licensee’s customers and counterparties, owners of shares of the Fund, or any other person or entity from the use of the Underlying Index or any data included therein in connection with the rights licensed as described herein or for any other use.

NYSE Arca makes no express or implied warranties and hereby expressly disclaims all warranties of merchantability or fitness for a particular purpose with respect to the Underlying Index or any data included therein. Without limiting any of the foregoing, in no event shall NYSE Arca have any liability for any direct, indirect, special, punitive, consequential or any other damages (including lost profits) even if notified of the possibility of such damages.

The past performance of the Underlying Index is not a guide to future performance. BFA and its affiliates do not guarantee the accuracy or the completeness of the Underlying Index or any data included therein and BFA and its affiliates shall have no liability for any errors, omissions or interruptions therein. BFA and its affiliates make no warranty, express or implied, to the owners of shares of the Fund or to any other person or entity, as to results to be obtained by the Fund from the use of the Underlying Index or any data included therein. Without limiting any of the foregoing, in no event shall BFA or its affiliates have any liability for any special, punitive, direct, indirect, consequential or any other damages (including lost profits), even if notified of the possibility of such damages.

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

Want to know more?

iShares.com | 1-800-474-2737

Information on the Fund’s net asset value, market price, premiums and discounts, and bid-ask spreads can be found at www.iShares.com. Copies of the Prospectus, SAI and recent shareholder reports can be found on our website at www.iShares.com. For more information about the Fund, you may request a copy of the SAI. The SAI provides detailed information about the Fund and is incorporated by reference into this Prospectus. This means that the SAI, for legal purposes, is a part of this Prospectus.

Additional information about the Fund's investments is available in the Fund's Annual and Semi-Annual Reports to shareholders. In the Fund's Annual Report, you will find a discussion of the market conditions and investment strategies that significantly affected the Fund's performance during the last fiscal year.

If you have any questions about the Trust or shares of the Fund or you wish to obtain the SAI, Semi-Annual or Annual Report free of charge, please:

Call:	1-800-iShares or 1-800-474-2737 (toll free) Monday through Friday, 8:30 a.m. to 6:30 p.m. (Eastern time)
Email:	iSharesETFs@blackrock.com
Write:	c/o BlackRock Investments, LLC 1 University Square Drive, Princeton, NJ 08540

Reports and other information about the Fund are available on the EDGAR database on the SEC's website at www.sec.gov, and copies of this information may be obtained, after paying a duplicating fee, by electronic request at the following e-mail address: publicinfo@sec.gov.

No person is authorized to give any information or to make any representations about the Fund and its shares not contained in this Prospectus and you should not rely on any other information. Read and keep this Prospectus for future reference.

Investment Company Act File No.: 811-22649

IS-P-CMDY-0322

	March 1, 2022

2022 Prospectus

iShares U.S. ETF Trust

•	iShares Commodity Curve Carry Strategy ETF \| CCRV \| NYSE ARCA

Table of Contents

Fund Overview	S-1
More Information About the Fund	1
A Further Discussion of Principal Risks	2
A Further Discussion of Other Risks	18
Portfolio Holdings Information	20
Management	20
Shareholder Information	23
Distribution	31
Financial Highlights	32
Disclaimers	33

ICE^® is a trademark of ICE Data Indices, LLC or its affiliates and has been licensed, along with the ICE BofA Commodity Enhanced Carry Total Return Index, for use by BlackRock Fund Advisors or its affiliates in connection with the Fund. BofA^® is a registered trademark of Bank of America Corporation licensed by Bank of America Corporation and its affiliates (“BofA”), and may not be used without BofA’s prior written approval. iShares^® and BlackRock^® are registered trademarks of BlackRock Fund Advisors and its affiliates.

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

iSHARES^® COMMODITY CURVE CARRY STRATEGY ETF

Ticker: CCRV

Stock Exchange: NYSE Arca

Investment Objective

The iShares Commodity Curve Carry Strategy ETF (the “Fund”) seeks to track the investment results of an index composed of commodities with the top ten highest ranking roll yields, on a total return basis, selected from a broad commodity universe.

Fees and Expenses

The Fund may incur “Acquired Fund Fees and Expenses.” Acquired Fund Fees and Expenses reflect the Fund's pro rata share of the fees and expenses incurred by investing in other investment companies. The impact of Acquired Fund Fees and Expenses is included in the total returns of the Fund. Acquired Fund Fees and Expenses are not included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Fund's prospectus (the “Prospectus”). BFA, the investment adviser to the Fund, has contractually agreed to waive a portion of its management fees in an amount equal to the Acquired Fund Fees and Expenses, if any, attributable to investments by the Fund in other funds advised by BFA, or its affiliates, through March 1, 2024. The contractual waiver may be terminated prior to March 1, 2024 only upon written agreement of the Trust and BFA.

You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Annual Fund Operating Expenses
(ongoing expenses that you pay each year as a
percentage of the value of your investments)

Management
Fees

Distribution
and
Service (12b-1)
Fees

Other
Expenses

Acquired Fund
Fees
and Expenses

Total Annual
Fund
Operating
Expenses

Fee Waiver

Total Annual
Fund
Operating
Expenses
After
Fee Waiver

0.40%

None

0.01%

0.41%

(0.01)%

0.40%

S-1

Table of Contents

1 Year		3 Years		5 Years		10 Years
$41		$130		$228		$516

Principal Investment Strategies

The Fund seeks to track the investment results of the ICE BofA Commodity Enhanced Carry Total Return Index (the “Underlying Index”), which measures the performance of the 10 commodity futures contracts representing the underlying commodities with the largest global production value, where more weight in the Underlying Index is given to those contracts having the highest degree of backwardation or lowest degree of contango (i.e., those with the highest “positive carry,” as explained below) among a universe of 22 futures contracts on physical agricultural,

energy, precious metals, and industrial metals commodities listed on U.S. and non-U.S. futures exchanges, as determined by ICE Data Services, LLC (“IDI” or the “Index Provider”). The Underlying Index is rebalanced on a monthly basis and could contain more than 10 contracts during the rebalancing period. The Fund seeks to achieve its investment objective primarily by investing in a total return swap on the Underlying Index.

The Fund, through its Subsidiary (as defined below) will invest in financial instruments that provide exposure to commodities, and not in the physical commodities themselves. Although the Fund reserves the right to invest in a broad range of financial instruments, the Fund expects to obtain a substantial amount of its exposure to the investment results of the Underlying Index by entering into total return swaps that provide returns similar to the commodity futures contracts referenced in the Underlying Index.

S-2

Table of Contents

expiring contract, then the market for the commodity is said to be in “backwardation.” In these markets, investors experience positive roll returns, which is referred to as “positive carry.” The term “contango” is used to describe a market in which the price for a new futures contract is more than the price of the expiring contract. In these markets, investors experience negative roll returns, which is referred to as “negative carry.” The Underlying Index seeks to employ a positive carry strategy that emphasizes commodities and futures contract months with the greatest degree of backwardation and lowest degree of contango, resulting in net gains through positive roll returns.

The Fund is expected to establish new total return swap contracts on the Underlying Index on an ongoing basis and replace expiring contracts. Total return swaps subsequently acquired by the Fund may have terms that differ from the swaps the Fund previously held. The Fund generally expects to pay a fixed payment rate and swap-related fees to each counterparty and receive the total return of the Underlying Index, including, in the event of negative performance by the Underlying Index, a negative return (i.e., a payment from the Fund to the swap counterparty). As of October 31, 2021, the Underlying Index was comprised of 13 components.

BFA uses a “passive” or indexing approach to try to achieve the Fund’s investment objective. Unlike many investment companies, the Fund does not try to “beat” the index it tracks and does not seek temporary defensive positions when markets decline or appear overvalued.

Indexing may eliminate the chance that the Fund will substantially outperform the Underlying Index but also may

reduce some of the risks of active management, such as poor selection of securities and/or other instruments. Indexing seeks to achieve lower costs and better after-tax performance by aiming to keep portfolio turnover low in comparison to actively managed investment companies.

The Fund also seeks to generate interest income and capital appreciation on the cash balances arising from its investment in Commodity Investments (as defined below) through a cash management strategy consisting primarily of investments in cash and cash equivalents, short-term government obligations, and short-term fixed-income securities (collectively, “Fixed-Income Investments”). The Fund invests in Fixed-Income Investments for investment purposes and to provide sufficient assets to account for (or “cover”) mark-to-market changes and to collateralize the Subsidiary’s

S-3

Table of Contents

investments in derivatives on a day-to-day basis.

The Fund may also invest in swaps on commodity futures contracts that are not included in the Underlying Index but provide exposure to commodities from the same sectors as those found in the Underlying Index, as well as in futures, options and forwards that provide exposure to commodities from such sectors (collectively with total return swaps on the Underlying Index, the “Commodity Investments”). The Fund will invest in Commodity Investments solely through its Subsidiary. INVESTING IN DERIVATIVE CONTRACTS MAY HAVE A LEVERAGING EFFECT ON THE FUND BECAUSE OF THE LEVERAGE INHERENT IN THE USE OF DERIVATIVES.

The Fund seeks to gain exposure to Commodity Investments by investing through a wholly-owned subsidiary organized in the Cayman Islands (the “Subsidiary”). The Subsidiary is advised by BFA and has the same investment objective as the Fund. Unlike the Fund, the Subsidiary is not an investment company registered under the Investment Company Act of 1940, as amended (the “1940 Act”). The Subsidiary invests solely in Commodity Investments and cash and cash equivalents.

In compliance with Subchapter M of the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”), the Fund may invest up to 25% of its total assets in the Subsidiary. The Fund’s Commodity Investments held in the Subsidiary are intended to provide the Fund with exposure to broad commodities consistent with current U.S. federal income tax laws applicable to investment companies such as the Fund, which limit the ability of investment companies to invest directly

in Commodity Investments.

The remainder of the Fund’s assets will be invested directly by the Fund, primarily in Fixed-Income Investments, including repurchase agreements, money market instruments, U.S. government and agency securities, sovereign debt obligations on non-U.S. countries (excluding emerging market countries), commercial paper, non-convertible corporate debt securities, and obligations of U.S. and non-U.S. banks and similar institutions.

The CFTC has adopted certain requirements that subject the adviser of a registered investment company to regulation by the CFTC if such registered investment company invests more than a prescribed level of its net asset value in commodity interests, including futures, options and swaps, or if the registered investment company markets itself as providing investment exposure to such instruments. Due to the Fund’s potential use of commodity interests above the prescribed levels, it is considered a “commodity pool” under the Commodity Exchange Act (“CEA”).

The Underlying Index is sponsored by the Index Provider, which is independent of the Fund and BFA. The Index Provider determines the composition and relative weightings of the securities in the Underlying Index and publishes information regarding the market value of the Underlying Index.

Summary of Principal Risks

S-4

Table of Contents

trading price, yield, total return and ability to meet its investment objective. The order of the below risk factors does not indicate the significance of any particular risk factor.

Assets Under Management (AUM) Risk. From time to time, an Authorized Participant (as defined in the Creations and Redemptions section of this Prospectus), a third-party investor, the Fund’s adviser or an affiliate of the Fund’s adviser, or a fund may invest in the Fund and hold its investment for a specific period of time to allow the Fund to achieve size or scale. There can be no assurance that any such entity would not redeem its investment or that the size of the Fund would be maintained at such levels, which could negatively impact the Fund.

premium or discount to NAV and possibly face trading halts or delisting.

Cash Transactions Risk. The Fund expects to effect all of its creations and redemptions for cash, rather than in-kind securities. As a result, the Fund may have to sell portfolio securities at inopportune times in order to obtain the

S-5

Table of Contents

cash needed to meet redemption orders. This may cause the Fund to sell a security and recognize a capital gain or loss that might not have been incurred if it had made a redemption in-kind. The use of cash creations and redemptions may also cause the Fund’s shares to trade in the market at wider bid-ask spreads or greater premiums or discounts to the Fund’s NAV.

Commodity-Linked Derivatives Risk. The commodities markets are volatile, and movements in the market price of one or more of the underlying commodities could cause the Fund to incur large losses. It is possible that the Fund could lose all or substantially all of its investment. Prices of commodity-linked investments have a historically low correlation with the returns of the stock and bond markets and are subject to change based on a variety of factors that may not be anticipated by the Fund’s adviser. The value of a commodity-linked derivative instrument (including swaps based on such instruments) typically is based upon the price movements of the underlying commodity or an economic variable linked to such price movements. The current market prices, or “spot prices,” and the price at a specified future date implied by the value of certain commodity-linked derivatives (including swaps based on such instruments), or the “futures prices,” for commodities will vary depending upon expectations regarding market conditions. The value of commodity-linked investments tied to both spot and futures prices of commodities may fluctuate quickly and dramatically as a result of changes affecting a particular commodity and may not correlate to price movements in other asset classes, such as stocks,

bonds and cash. Commodity-linked derivatives are subject to the risk that the counterparty to the transaction, the exchange or trading facility on which they trade or the applicable clearing house may default or otherwise fail to perform. The Fund’s use of commodity-linked derivatives may also have a leveraging effect on the Fund’s portfolio because of the leverage inherent in the use of derivatives. Leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the Fund would otherwise have had. The Fund is required to post margin with respect to its holdings in derivatives. Each of these factors and events could have a significant negative impact on the Fund.

Commodity Market Disruption Risk. The commodity markets are subject to temporary distortions and other disruptions due to, among other factors, lack of liquidity, the participation of speculators, and government regulation, intervention and other actions. U.S. futures exchanges and some foreign exchanges limit the amount of fluctuation in futures contract prices that may occur in a single business day (generally referred to as “daily price fluctuation limits”). The maximum or minimum price of a contract as a result of these limits is referred to as a “limit price.” If the limit price has been reached in a particular contract, no trades may be executed beyond the limit price. Limit prices have the effect of precluding trading in a particular contract or forcing the liquidation of contracts at disadvantageous times or prices. The CFTC and the U.S. commodities exchanges are also authorized to take other actions in the event of a market emergency, including,

S-6

Table of Contents

for example, the imposition of higher margin requirements and the suspension of trading. Any of those actions, if taken, could adversely affect the returns of the Fund.

Commodity Risk. The Fund has substantial exposure to commodities. The Fund invests in instruments that are susceptible to fluctuations in certain commodity markets and to price changes due to trade relations, including the imposition of tariffs by the U.S. and other importing countries. Any negative changes in commodity markets that may be due to changes in supply and demand for commodities, market events, regulatory developments, other catastrophic events, or other factors that the Fund cannot control could have an adverse impact on the Commodity Investments in which the Fund invests.

Concentration Risk. The Fund may be susceptible to an increased risk of loss, including losses due to adverse events

that affect the Fund’s investments more than the market as a whole, to the extent that the Fund's investments are concentrated in the securities and/or other assets of a particular issuer or issuers, country, group of countries, region, market, industry, group of industries, sector, market segment or asset class.

Counterparty Risk. Certain commodity-linked derivative instruments, uncleared swaps agreements and other forms of financial instruments that involve counterparties subject the Fund to the risk that the counterparty could default on its obligations under the agreement, either through the counterparty’s bankruptcy or failure to perform its obligations. In the event of a counterparty default, the Fund could experience lengthy delays in recovering some or all of its assets or obtain no recovery at all and, if the counterparty is subject to specified types of resolution proceedings, the Fund may be subject to stays that limit its ability to close out positions and limit risk. The Fund’s investments in the futures markets also introduce the risk that its futures commission merchant (“FCM”) could default on an obligation set forth in an agreement between the Fund and the FCM, including the FCM’s obligation to return margin posted in connection with the Fund’s futures contracts.

Credit Risk. Debt issuers and other counterparties may be unable or unwilling to make timely interest and/or principal payments when due or otherwise honor their obligations. Changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may also adversely affect the value of the Fund’s investment in that issuer. The degree of credit risk depends on an issuer's or

S-7

Table of Contents

counterparty's financial condition and on the terms of an obligation.

losses and could make derivatives more difficult for the Fund to value accurately. The Fund could also suffer losses related to its derivatives positions as a result of unanticipated market movements, or movements between the time of periodic reallocations of Fund assets, which losses are potentially unlimited. Certain derivatives may give rise to a form of leverage and may expose the Fund to greater risk and increase its costs. The impact of U.S. and global regulation of derivatives may make derivatives more costly, may limit the availability of derivatives, may delay or restrict the exercise by the Fund of termination rights or remedies upon a counterparty default under derivatives held by the Fund (which could result in losses), or may otherwise adversely affect the value or performance of derivatives.

Futures Contract Risk. Futures are standardized, exchange-traded contracts that obligate a purchaser to take delivery, and a seller to make

S-8

Table of Contents

delivery, of a specific amount of an asset at a specified future date at a specified price. Unlike equities, which typically entitle the holder to a continuing ownership stake in an issuer, futures contracts normally specify a certain date for settlement in cash based on the level of the reference rate. The primary risks associated with the use of futures contracts, or swaps or other derivatives referencing futures contracts, are: (i) the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; (ii) possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; (iii) losses caused by unanticipated market movements, which are potentially unlimited; (iv) BFA’s inability to predict correctly the direction of prices and other economic factors; and (v) the possibility that the counterparty will default in the performance of its obligations. To the extent that the Fund is exposed to rolling futures contracts, it may be subject to additional risk. In addition, CFTC regulations limit the types of foreign listed futures contracts that U.S. investors, like the Fund, are allowed to invest in. As a result, the Fund may not be able to gain the exposure it seeks through certain non-U.S. futures contracts.

Geographic Risk. A natural disaster could occur in a geographic region in which the Fund invests, which could adversely affect the economy or the business operations of companies in the specific geographic region, causing an adverse impact on the Fund's investments in, or which are exposed to, the affected region.

Income Risk. The Fund’s income may decline when yields fall. This decline can occur because the Fund may subsequently invest in lower-yielding Fixed-Income Investments as Fixed-Income Investments in its portfolio mature, are near maturity or are called, or the Fund otherwise needs to purchase additional bonds.

Index-Related Risk. There is no guarantee that the Fund’s investment results will have a high degree of correlation to those of the Underlying Index or that the Fund will achieve its investment objective. Market disruptions and regulatory restrictions could have an adverse effect on the Fund’s ability to adjust its exposure to the required levels in order to track the Underlying Index. Errors in index data, index computations or the construction of the Underlying Index in accordance with its methodology may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, which may have an adverse impact on the Fund and its shareholders. Unusual market conditions may cause the Index Provider to postpone a scheduled rebalance, which could cause the Underlying Index to vary from its normal or expected composition.

S-9

Table of Contents

will have an impact on the Fund and its investments and could impact the Fund’s ability to purchase or sell securities or cause elevated tracking error and increased premiums or discounts to the Fund's NAV. Other infectious illness outbreaks in the future may result in similar impacts.

Interest Rate Risk. During periods of very low or negative interest rates, the Fund may be unable to maintain positive returns or pay dividends to Fund shareholders. Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, result in heightened market volatility and detract from the Fund’s performance to the extent the Fund is exposed to such interest rates. Additionally, under certain market conditions in which interest rates are low and the market prices for portfolio securities have increased, the Fund may have a very low or even negative yield. A low or negative yield would cause the Fund to lose money in certain conditions and over certain time periods. An increase in interest rates will generally cause the value of securities held by the Fund to decline, may lead to heightened volatility in the fixed-income markets and may adversely affect the liquidity of certain fixed-income investments, including those held by the Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. The historically low

interest rate environment heightens the risks associated with rising interest rates.

Issuer Risk. The performance of the Fund depends on the performance of individual securities or other assets to which the Fund has exposure as well as the correlation among the assets. Changes in the financial condition or credit rating of an issuer of those securities or of securities referenced by swaps or other derivatives or the seller or counterparty with respect to derivatives or other assets may cause the value of the securities, derivatives, or other assets to decline.

Management Risk. As the Fund may not fully replicate the Underlying Index, it is subject to the risk that BFA's investment strategy may not produce the intended results.

Market Risk. The Fund could lose money over short periods due to short-term market movements and over longer periods during more prolonged market downturns. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund and its investments and could result in increased premiums or discounts to the Fund’s NAV.

Market Trading Risk. The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, periods of high volatility and disruptions in the creation/redemption process. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

S-10

Table of Contents

Passive Investment Risk. The Fund is not actively managed, and BFA generally

does not attempt to take defensive positions under any market conditions, including declining markets.

Risk of Investing in Agriculture and Livestock. Investments in the agricultural and livestock sectors may be volatile and change unpredictably as a result of many factors, such as legislative or regulatory developments relating to food safety, the imposition of tariffs or other trade restraints, and the supply and demand of each commodity. Increased competition and changes in consumer tastes and spending can also influence the demand for agricultural and livestock products, affecting the price of such commodities and the performance of the Fund.

Risk of Investing in Gold. The Fund has exposure to gold through its investments in total return swaps on the Underlying Index. Thus, the Fund’s portfolio may be adversely affected by changes or trends in the price of gold. The price of gold and of gold-related instruments historically has been volatile, which may adversely affect the value of total return swaps on the Underlying Index. Governments, central banks, or other larger holders can influence the production and sale of gold, which may adversely affect the performance of the Fund.

S-11

Table of Contents

various economic, financial, social and political factors, which may be unpredictable and may have a significant impact on the prices of precious metals.

Risk of Swap Agreements. A swap is a two-party contract that generally obligates each counterparty to exchange periodic payments based on a pre-determined underlying investment or notional amount and to exchange collateral to secure the obligations of each counterparty. Swaps may be leveraged and are subject to counterparty risk, credit risk and pricing risk. Swaps may be subject to illiquidity risk, and it may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses. Certain standardized interest rate and credit default swaps are required to be traded on an exchange or trading platform and centrally cleared. Most other swaps are entered into a negotiated, bi-lateral basis and traded in the over-the-counter market. Swaps are subject to bi-lateral variation margin. Initial margin requirements are in the process of being phased in, and the Fund may be subject to such requirements as early as September 2022. These requirements may raise the costs for the Fund’s investment in swaps.

Small Fund Risk. When the Fund’s size is small, the Fund may experience low trading volume and wide bid/ask spreads. In addition, the Fund may face the risk of being delisted if the Fund

does not meet certain conditions of the listing exchange. Any resulting liquidation of the Fund could cause the Fund to incur elevated transaction costs for the Fund and negative tax consequences for its shareholders.

S-12

Table of Contents

“qualifying income,” the Fund might be required to make changes to its operations, which could reduce the Fund’s ability to gain investment exposure to commodities. Fund shareholders could also experience adverse tax consequences in such circumstances.

Tracking Error Risk. The Fund may be subject to “tracking error,” which is the divergence of the Fund’s performance from that of the Underlying Index. Tracking error may occur because of differences between the securities and other instruments held in the Fund’s portfolio and those included in the Underlying Index, pricing differences, transaction costs incurred by the Fund, the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be heightened during times of increased market volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX ETFs THAT

TRACK INDICES WITH SIGNIFICANT WEIGHT IN FUTURES CONTRACTS ISSUERS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

Valuation Risk. The price the Fund could receive upon the sale of a security or other asset may differ from the Fund's valuation of the security or other asset, particularly for securities or other assets that trade in low volume or volatile markets, or assets that are impacted by market disruption events or that are valued using a fair value methodology as a result of trade suspensions or for other reasons. In addition, the value of the securities or other assets in the Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund's shares. Authorized Participants who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

S-13

Table of Contents

Performance Information

Year by Year Returns (Year Ended December 31)

The best calendar quarter return during the period shown above was 12.08% in the 2nd quarter of 2021; the worst was 5.05% in the 4th quarter of 2021.

Updated performance information, including the Fund’s current NAV, may be obtained by visiting our website at www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).

Average Annual Total Returns

(for the periods ended December 31, 2021)

	One Year	Since Fund Inception
(Inception Date: 9/1/2020)
Return Before Taxes	33.51%	29.23%
Return After Taxes on Distributions¹	22.01%	20.79%
Return After Taxes on Distributions and Sale of Fund Shares¹	19.73%	18.85%
ICE BofA Commodity Enhanced Carry Total Return Index (Index returns do not reflect deductions for fees, expenses, or taxes)	34.18%	30.00%

S-14

Table of Contents

Management

Investment Adviser. BlackRock Fund Advisors.

Portfolio Managers. Richard Mejzak, Paul Whitehead and Amy Whitelaw (the “Portfolio Managers”) are primarily responsible for the day-to-day management of the Fund. Each Portfolio Manager supervises a portfolio management team. Mr. Mejzak and Ms. Whitelaw have been Portfolio Managers of the Fund since 2020. Mr. Whitehead has been a Portfolio Manager of the Fund since 2022.

Purchase and Sale of Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

S-15

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

More Information About the Fund

Table of Contents

An investment in the Fund is not a bank deposit and it is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, BFA or any of its affiliates.

The Fund's investment objective and the Underlying Index may be changed without shareholder approval.

A Further Discussion of Principal Risks

Calculation Methodology Risk. The Underlying Index relies on various sources of information to assess the criteria of issuers included in the Underlying Index, including information that may be based on assumptions and estimates. Neither the Fund nor BFA can offer assurances that the Underlying Index's calculation methodology or sources of information will provide an accurate assessment of included issuers.

Table of Contents

Cash Transactions Risk. Unlike most other ETFs, the Fund expects to effect all of its creations and redemptions for cash, rather than in-kind securities. Paying redemption proceeds in cash rather than through in-kind delivery of portfolio securities may require the Fund to dispose of or sell portfolio securities or other assets at an inopportune time to obtain the cash needed to meet redemption orders. This may cause the Fund to sell a security and recognize a capital gain or loss that might not have been incurred if it had made a redemption in-kind. As a result, the Fund may pay out higher or lower annual capital gains distributions than ETFs that redeem in-kind. The use of cash creations and redemptions may also cause the Fund’s shares to trade in the market at greater bid-ask spreads or greater premiums or discounts to the Fund’s NAV.

Commodity-Linked Derivatives Risk. The value of a commodity-linked derivative instrument (including swaps based on such instruments) typically is based upon the price movements of the underlying commodity or an economic variable linked to such price movements. Therefore, the value of commodity-linked derivative instruments may be affected by changes in overall economic conditions, interest rates, or factors affecting a particular commodity or industry, such as production, disease, climate conditions, supply or demand, politics, geopolitics, changes in international balance of payments and trade, currency devaluations and revaluations, market liquidity, and economic, political and regulatory developments. The current market prices, or “spot prices,” and the price at a specified future date implied by the value of certain commodity-linked derivatives (including swaps based on such instruments), or the “futures prices,” for commodities will vary depending upon expectations regarding market conditions. The value of commodity-linked investments tied to both spot and futures prices of commodities may fluctuate quickly and dramatically as a result of changes affecting a particular commodity and may or may not correlate to price movements in other asset classes, such as stocks, bonds and cash. Investments in commodity-linked derivatives may be subject to greater volatility than non-derivative based investments because of the leverage inherent in the use of derivatives. A highly liquid secondary market may not exist for certain commodity-linked derivatives, and there can be no assurance that one will develop. Commodity-linked derivatives also

Table of Contents

may be subject to credit and interest rate risks that in general affect the values of fixed-income securities. Therefore, at maturity, the Fund may receive more or less principal than it originally invested. The Fund might receive interest payments that are more or less than the stated coupon interest payments. Commodity derivatives are subject to the risk that the counterparty to the transaction, the exchange or trading facility on which they trade or the applicable clearing house may default or otherwise fail to perform. In addition, each exchange or trading facility on which derivatives are traded has the right to suspend or limit trading in all futures or other instruments that it lists. The Fund’s use of commodity-linked derivatives can result in large amounts of financial leverage. Although the Fund will not borrow money in order to increase the amount of its trading, the low margin deposits normally required in futures trading permit a high degree of leverage on the investment itself. Accordingly, a relatively small price movement in a futures contract may result in immediate and substantial losses to the Fund. Like other leveraged investments, any trade may result in losses in excess of the amount invested. Each of these factors and events could have a significant negative impact on the Fund.

The constituents of the Underlying Index may experience such disruptions in trading. The Fund may be negatively impacted by the cessation of trading in futures contracts included in the Fund’s Underlying Index or by a futures exchange imposing a limit price. If there is a market disruption event on a day when the Fund enters into or terminates a swap transaction tied to the Underlying Index, there could be an adverse impact on the Fund’s portfolio and the performance of the Fund. Market disruption events may delay payments on swaps tied to the futures market. In order to meet redemption requests, the Fund may be forced to terminate swaps tied to the futures market at disadvantageous times or prices if a market disruption event persists beyond two consecutive business days.

In the event of a market disruption event, the execution price the Fund will pay or receive upon the settlement of a swap transaction tied to the Underlying Index may differ from the Fund’s initial valuation of the swap, which is based on the official closing price of the Underlying Index, which uses the limit price of the affected contract. Authorized Participants who purchase or redeem shares on a day when one or more

Table of Contents

constituents of the Underlying Index is experiencing a market disruption event could bear additional costs associated with increased market risk because the execution price of the swap may differ from the value assigned to the swap on the day the Authorized Participant submits their creation or redemption order. Such market disruption events may have an adverse effect on the value of the Fund shares.

Counterparty Risk. Certain commodity-linked derivative instruments, uncleared swaps agreements and other forms of financial instruments that involve counterparties subject the Fund to the risk that the counterparty could default on its obligations under the agreement, either through the counterparty’s bankruptcy or failure to perform its obligations. In the event of a counterparty default, the Fund could experience lengthy delays in recovering some or all of its assets or obtain no recovery at all and, if the counterparty is subject to specified types of resolution proceedings, the Fund may be subject to stays that limit its ability to close out positions and limit risk. The Fund may deposit funds required to margin open positions in the derivative instruments subject

Table of Contents

Futures Contract Risk. Futures are standardized, exchange-traded contracts that obligate a purchaser to take delivery, and a seller to make delivery, of a specific amount of an asset at a specified future date at a specified price. Unlike equities, which typically entitle the holder to a continuing ownership stake in an issuer, futures contracts normally specify a certain date for settlement in cash based on the level of the reference rate. The primary risks associated with the use of futures contracts, or swaps or other derivatives referencing futures contracts, are: (i) the imperfect correlation between the change in market value of the swaps or other derivatives referencing futures contracts held by the Fund and the price of the futures contract; (ii) possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; (iii) losses caused by unanticipated market movements, which are potentially unlimited; (iv) BFA's inability to predict correctly the direction of prices and other economic factors; and (v) the possibility that the counterparty to a swap or other derivative referencing futures contracts will default in the performance of its obligations. When a futures contract is rolled forward—which may be done in order to retain the allocation to a specific position beyond the maturity of the futures contract—the Fund may lose money if the two contracts are trading at different prices as compared to fair value. For example, if the futures contract which the Fund has exposure to and is rolling is trading at a discount to fair value and the new contract it rolls into is trading at a premium to fair value, the Fund will lose money. The actual realization of a potential roll cost will be dependent upon the difference in price of the near and distant contracts. In addition, CFTC regulations limit the types of foreign listed futures contracts that U.S. investors, like the Fund, are allowed to invest in. As a result, the Fund may not be able to gain the exposure it seeks through certain non-U.S. futures contracts.

Geographic Risk. Some of the assets in which the Fund invests are located in, or exposed to, parts of the world that have historically been prone to natural disasters, such as earthquakes, tornadoes, volcanic eruptions, droughts, floods, hurricanes or tsunamis, and are economically sensitive to environmental events. Any such event may adversely impact the economies of these geographic areas or assets exposed to these geographic areas, causing an adverse impact on the value of the Fund.

Index-Related Risk. The Fund seeks to achieve a return that corresponds generally to the price and yield performance, before fees and expenses, of the Underlying Index as

Table of Contents

published by the Index Provider. There is no assurance that the Index Provider or any agents that may act on its behalf will compile the Underlying Index accurately, or that the Underlying Index will be determined, composed or calculated accurately. While the Index Provider provides descriptions of what the Underlying Index is designed to achieve, neither the Index Provider nor its agents provide any warranty or accept any liability in relation to the quality, accuracy or completeness of the Underlying Index or its related data, and they do not guarantee that the Underlying Index will be in line with the Index Provider’s methodology. BFA’s mandate as described in this Prospectus is to manage the Fund consistently with the Underlying Index provided by the Index Provider to BFA. BFA does not provide any warranty or guarantee against the Index Provider’s or any agent’s errors. Errors in respect of the quality, accuracy and completeness of the data used to compile the Underlying Index may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, particularly where the indices are less commonly used as benchmarks by funds or managers. Such errors may negatively or positively impact the Fund and its shareholders. For example, during a period where the Underlying Index contains incorrect constituents, the Fund would have market exposure to such constituents and would be underexposed to the Underlying Index’s other constituents. Shareholders should understand that any gains from Index Provider errors will be kept by the Fund and its shareholders and any losses or costs resulting from Index Provider errors will be borne by the Fund and its shareholders.

Table of Contents

expected to result in elevated tracking error and increased premiums or discounts to the Fund's NAV.

■	General Impact. This outbreak has resulted in travel restrictions, closed international borders, enhanced health screenings at ports of entry and elsewhere, disruption of, and delays in, healthcare service preparation and delivery, prolonged quarantines, cancellations, supply chain disruptions, lower consumer demand, temporary and permanent closures of stores, restaurants and other commercial establishments, layoffs, defaults and other significant economic impacts, as well as general concern and uncertainty.
■	Market Volatility. The outbreak has also resulted in extreme volatility, severe losses, and disruptions in markets which can adversely impact the Fund and its investments, including impairing hedging activity to the extent the Fund engages in such activity, as expected correlations between related markets or instruments may no longer apply. In addition, to the extent the Fund invests in short-term instruments that have negative yields, the Fund’s value may be impaired as a result. Certain issuers of equity securities have cancelled or announced the suspension of dividends. The outbreak has, and may continue to, negatively affect the credit ratings of some fixed-income securities and their issuers.
■	Market Closures. Certain local markets have been or may be subject to closures, and there can be no assurance that trading will continue in any local markets in which the Fund may invest, when any resumption of trading will occur or, once such markets resume trading, whether they will face further closures. Any suspension of trading in markets in which the Fund invests will have an impact on the Fund and its investments and will impact the Fund’s ability to purchase or sell securities in such markets.
■	Operational Risk. The outbreak could also impair the information technology and other operational systems upon which the Fund’s service providers, including BFA, rely, and could otherwise disrupt the ability of employees of the Fund's service providers to perform critical tasks relating to the Fund, for example, due to the service providers’ employees performing tasks in alternate locations than under normal operating conditions or the illness of certain employees of the Fund's service providers.
■	Governmental Interventions. Governmental and quasi-governmental authorities and regulators throughout the world have responded to the outbreak and the resulting economic disruptions with a variety of fiscal and monetary policy changes, including direct capital infusions into companies and other issuers, new monetary policy tools, and lower interest rates. An unexpected or sudden reversal of these policies, or the ineffectiveness of such policies, is likely to increase market volatility, which could adversely affect the Fund’s investments.
■	Pre-Existing Conditions. Public health crises caused by the outbreak may exacerbate other pre-existing political, social and economic risks in certain countries or globally, which could adversely affect the Fund and its investments and could result in increased premiums or discounts to the Fund's NAV.

Other infectious illness outbreaks that may arise in the future could have similar or other unforeseen effects.

Table of Contents

Interest Rate Risk. If interest rates rise, the value of fixed-income securities or other instruments held by the Fund would likely decrease. A measure investors commonly use to determine this price sensitivity is called duration. Fixed-income securities with longer durations tend to be more sensitive to interest rate changes, usually making their prices more volatile than those of securities with shorter durations. To the extent the Fund invests a substantial portion of its assets in fixed-income securities with longer duration, rising interest rates may cause the value of the Fund's investments to decline significantly, which would adversely affect the value of the Fund. An increase in interest rates may lead to heightened volatility in the fixed-income markets and adversely affect certain fixed-income investments, including those held by the Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. In addition, decreases in fixed income dealer market-making capacity may lead to lower trading volume, heightened volatility, wider bid-ask spreads and less transparent pricing in certain fixed-income markets.

Issuer Risk. The performance of the Fund depends on the performance of individual securities or assets to which the Fund has exposure. The Fund may be adversely affected if an issuer of underlying securities held by the Fund is unable or unwilling to repay principal or interest when due. Any issuer of these securities or assets may perform poorly, causing the value of its securities or assets to decline. Poor performance may be caused by poor management decisions, competitive pressures, changes in technology, expiration of patent protection, disruptions in supply, labor problems or shortages, corporate restructurings, fraudulent disclosures, credit deterioration of the issuer or other factors. An issuer may also be subject to risks

Table of Contents

associated with the countries, states and regions in which the issuer resides, invests, sells products, or otherwise conducts operations.

Management Risk. Because BFA uses a representative sampling indexing strategy, the Fund may not fully replicate the Underlying Index and may hold securities not included in the Underlying Index. As a result, the Fund is subject to the risk that BFA’s investment strategy, the implementation of which is subject to a number of constraints, may not produce the intended results.

Market Trading Risk.

Secondary Market Trading Risk. Shares of the Fund may trade in the secondary market at times when the Fund does not accept orders to purchase or redeem shares. At such

Table of Contents

times, shares may trade in the secondary market with more significant premiums or discounts than might be experienced at times when the Fund accepts purchase and redemption orders.

Table of Contents

volume and market liquidity, is generally narrower if the Fund has more trading volume and market liquidity and wider if the Fund has less trading volume and market liquidity. In addition, increased market volatility may cause wider spreads. There may also be regulatory and other charges that are incurred as a result of trading activity. Because of the costs inherent in buying or selling Fund shares, frequent trading may detract significantly from investment results and an investment in Fund shares may not be advisable for investors who anticipate regularly making small investments through a brokerage account.

Money Market Instruments Risk. The value of money market instruments may be affected by changing interest rates and by changes in the credit ratings of the investments. If a significant amount of the Fund's assets are invested in money market instruments, it will be more difficult for the Fund to achieve its investment objective. An investment in a money market fund is not insured or guaranteed by the FDIC or any other government agency. It is possible to lose money by investing in a money market fund. Money market funds other than government money market funds or retail money market funds “float” their NAV instead of using a stable $1.00 per share price.

Non-Diversification Risk. The Fund is classified as “non-diversified.” This means that the Fund may invest a large percentage of its assets in securities issued by or representing a small number of issuers. As a result, the Fund may be more susceptible to the risks associated with these particular issuers or to a single economic, political or regulatory occurrence affecting these issuers.

Operational Risk. The Fund is exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund's service providers, counterparties or other third parties, failed or inadequate processes and technology or systems failures. The Fund and BFA seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

Risk of Investing in Agriculture and Livestock. The agricultural and livestock sectors are subject to government subsidy policies and environmental, health and safety laws and regulations. Specific governmental policies, such as taxes, tariffs, duties, subsidies and import and export restrictions on agricultural commodities, commodity products and livestock, can influence the profitability of investing in agriculture and livestock. Import restrictions and tariffs that have recently been imposed by foreign countries on U.S. agricultural and livestock products are expected to negatively impact the profitability of investing in these products. These industries may also be adversely affected by changes in commercial and consumer demand for their products. A growing competitive landscape and increased availability of such commodities can influence: (i) the planting and raising of certain crops/livestock versus other uses of resources; (ii) the location and size of crop and livestock

Table of Contents

production; (iii) whether unprocessed or processed commodity products are traded; and (iv) the volume and types of imports and exports. Economic recession or labor difficulties may also lead to a decrease in demand for the products and services involved in agriculture. As a result, the price of agricultural or livestock commodities could decline, which would affect the performance of the Fund.

Additionally, increased environmental or labor costs may depress the value of mining and metal investments.

Table of Contents

elevated public debt levels for the foreseeable future. Although elevated debt levels do not necessarily indicate or cause economic problems, elevated public debt service costs may constrain future economic growth.

Small Fund Risk. When the Fund’s size is small, the Fund may experience low trading volume and wide bid/ask spreads. In addition, the Fund may face the risk of being delisted if the Fund does not meet certain conditions of the listing exchange. If the Fund were to be required to delist from the listing exchange, the value of the Fund may rapidly decline and performance may be negatively impacted. Any resulting liquidation of the Fund could cause the Fund to incur elevated transaction costs for the Fund and negative tax consequences for its shareholders.

Table of Contents

be no assurance that the investment objective of the Subsidiary will be achieved. The Subsidiary is not registered under the 1940 Act, and, unless otherwise noted in the Prospectus, is not subject to the investor protections of the 1940 Act. The Trust’s Board of Trustees (the “Board”) has oversight responsibility for the investment activities of the Fund, including its investment in the Subsidiary, and the Fund’s role as sole shareholder of the Subsidiary. The Subsidiary’s financial statements are consolidated with the Fund’s financial statements that are included in the Fund’s Annual and Semi-Annual Reports to shareholders.

Table of Contents

that are impacted by market disruption events or that are valued using a fair value methodology as a result of trade suspensions or for other reasons. Because non-U.S. exchanges may be open on days when the Fund does not price its shares, the value of the securities or other assets in the Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund’s shares. Authorized Participants who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

A Further Discussion of Other Risks

Futures Commission Merchant Risk. The CEA requires an FCM to segregate funds deposited in a customer's commodity futures account. If the FCM fails to properly segregate customer funds, the Fund may be subject to a risk of loss of its funds on deposit in the event of the FCM's bankruptcy or insolvency. In addition, under certain circumstances, such as the inability of another customer of the FCM or its own inability to satisfy substantial deficiencies in such other customer's account, the Fund may be subject to a risk of loss of its funds on deposit even if such funds are properly segregated. In the case of any such bankruptcy or customer loss, the Fund might recover only a pro rata share of all property available for distribution to all of the FCM's customers. If no property is available for distribution to the FCM's customers, the Fund would not recover any of its assets on deposit with the FCM.

Table of Contents

things, the reduced number and capacity of traditional market participants to make a market in securities or instruments or the lack of an active market for such securities or instruments. To the extent that the Fund invests in securities or instruments with substantial market and/or credit risk, the Fund will tend to have increased exposure to the risks associated with illiquid investments. Liquid investments may become illiquid after purchase by the Fund, particularly during periods of market turmoil. There can be no assurance that a security or instrument that is deemed to be liquid when purchased will continue to be liquid for as long as it is held by the Fund, and any security or instrument held by the Fund may be deemed an illiquid investment pursuant to the Fund’s liquidity risk management program. Illiquid investments may be harder to value, especially in changing markets. If the Fund is forced to sell underlying investments at reduced prices or under unfavorable conditions to meet redemption requests or for other cash needs, the Fund may suffer a loss. This may be magnified in a rising interest rate environment or other circumstances where redemptions from the Fund may be greater than normal. Other market participants may be attempting to liquidate holdings at the same time as the Fund, causing increased supply of the Fund’s underlying investments in the market and contributing to illiquid investments risk and downward pricing pressure. During periods of market volatility, liquidity in the market for the Fund’s shares may be impacted by the liquidity in the market for the underlying securities or instruments held by the Fund, which could lead to the Fund’s shares trading at a premium or discount to the Fund's NAV.

Table of Contents

aggregate and/or fund-level amount invested or voted by BFA and its affiliates for their proprietary accounts and for client accounts (including the Fund) that may not be exceeded without the grant of a license or other regulatory or corporate consent or, if exceeded, may cause BFA and its affiliates, the Fund or other client accounts to suffer disadvantages or business restrictions.

U.S. Treasury Obligations Risk. U.S. Treasury obligations may differ from other securities in their interest rates, maturities, times of issuance and other characteristics. Similar to other issuers, changes to the financial condition or credit rating of the U.S. government may cause the value of the Fund's U.S. Treasury obligations to decline. On August 5, 2011, S&P Global Ratings downgraded U.S. Treasury securities from AAA rating to AA+ rating. A further downgrade of the ratings of U.S. government debt obligations, which are often used as a benchmark for other borrowing arrangements, could result in higher interest rates for individual and corporate borrowers, cause disruptions in the international bond markets and have a substantial negative effect on the U.S. economy. A downgrade of U.S. Treasury securities from another ratings agency or a further downgrade below AA+ rating by S&P Global Ratings may cause the value of the Fund's U.S. Treasury obligations to decline.

Portfolio Holdings Information

Management

Table of Contents

do not include expenses related to the organization of any subsidiary for the Fund or the ongoing corporate expenses of maintaining such subsidiary.

For its investment advisory services to the Fund, BFA is paid a management fee from the Fund based on a percentage of the Fund's average daily net assets, at the annual rate of 0.40%. BFA also serves as investment adviser to the Subsidiary. No fee will be paid to BFA for the advisory services that it provides to the Subsidiary. BFA has contractually agreed to waive a portion of its management fees in an amount equal to the Acquired Fund Fees and Expenses, if any, attributable to investments by the Fund in other funds advised by BFA, or its affiliates, through March 1, 2024. The contractual waiver may be terminated prior to March 1, 2024 only upon written agreement of the Trust and BFA. In addition, BFA may from time to time voluntarily waive and/or reimburse fees or expenses in order to limit total annual fund operating expenses (excluding acquired fund fees and expenses, if any). Any such voluntary waiver or reimbursement may be eliminated by BFA at any time.

A discussion regarding the basis for the approval by the Board of the Investment Advisory Agreement with BFA is available in the Fund's Annual Report for the period ended October 31.

Portfolio Managers. Richard Mejzak, Paul Whitehead and Amy Whitelaw are primarily responsible for the day-to-day management of the Fund. Each Portfolio Manager is responsible for various functions related to portfolio management, including, but not limited to, developing and implementing the Fund’s investment process and investment strategy, researching and reviewing investment strategy and overseeing members of his portfolio management team that have more limited responsibilities.

Table of Contents

Administrator, Custodian and Transfer Agent. State Street Bank and Trust Company (“State Street”) is the administrator, custodian and transfer agent for the Fund.

Conflicts of Interest. The investment activities of BFA and its affiliates (including BlackRock and its subsidiaries (collectively, the “Affiliates”)), and their respective directors, officers or employees, in the management of, or their interest in, their own accounts and other accounts they manage, may present conflicts of interest that could disadvantage the Fund and its shareholders. BFA and its Affiliates provide investment management services to other funds and discretionary managed accounts that may follow investment programs similar to that of the Fund. BFA and its Affiliates are involved worldwide with a broad spectrum of financial services and asset management activities and may engage in the ordinary course of business in activities in which their interests or the interests of their clients may conflict with those of the Fund. BFA or one or more Affiliates act, or may act, as an investor, research provider, investment manager, commodity pool operator, commodity trading advisor, financier, underwriter, adviser, trader, lender, index provider, agent and/or principal, and have other direct and indirect interests in securities, currencies, commodities, derivatives and other instruments in which the Fund may directly or indirectly invest. The Fund may invest in securities of, or engage in other transactions with, companies with which an Affiliate has significant debt or equity investments or other interests. The Fund may also invest in issuances (such as structured notes) by entities for which an Affiliate provides and is compensated for cash management services relating to the proceeds from the sale of such issuances. The Fund also may invest in securities of, or engage in other transactions with, companies for which an Affiliate provides or may in the future provide research coverage. An Affiliate may have business relationships with, and purchase or distribute or sell services or products from or to, distributors, consultants or others who recommend the Fund or who engage in transactions with or for the Fund, and may receive compensation for such services. BFA or one or more Affiliates may engage in proprietary trading and advise accounts and funds that have investment objectives similar to those of the Fund and/or that engage in and compete for transactions in the same types of securities, currencies and other instruments as the Fund. This may include transactions in securities issued by other open-end and closed-end investment companies (which may include investment companies that are

Table of Contents

affiliated with the Fund and BFA, to the extent permitted under the 1940 Act). The trading activities of BFA and these Affiliates are carried out without reference to positions held directly or indirectly by the Fund and may result in BFA or an Affiliate having positions in certain securities that are senior or junior to, or have interests different from or adverse to, the securities that are owned by the Fund.

The Fund's activities may be limited because of regulatory restrictions applicable to BFA or one or more Affiliates and/or their internal policies designed to comply with such restrictions.

Shareholder Information

Table of Contents

The Board has adopted a policy of not monitoring for frequent purchases and redemptions of Fund shares (“frequent trading”) that appear to attempt to take advantage of a potential arbitrage opportunity presented by a lag between a change in the value of the Fund’s portfolio securities and other assets after the close of the primary markets for the Fund’s portfolio securities or assets and the reflection of that change in the Fund’s NAV (“market timing”), because the Fund sells and redeems its shares directly through transactions that are for cash, subject to the conditions described below under Creations and Redemptions. The Board has not adopted a policy of monitoring for other frequent trading activity because shares of the Fund are listed for trading on a national securities exchange.

The national securities exchange on which the Fund's shares are listed is open for trading Monday through Friday and is closed on weekends and the following holidays (or the days on which they are observed): New Year’s Day, Martin Luther King, Jr. Day, Presidents’ Day, Good Friday, Memorial Day, Juneteenth, Independence Day, Labor Day, Thanksgiving Day and Christmas Day. The Fund’s primary listing exchange is NYSE Arca.

Table of Contents

companies and companies controlled by them. However, registered investment companies are permitted to invest in the Fund beyond the limits set forth in Section 12(d)(1), subject to certain terms and conditions set forth in SEC rules. In order for a registered investment company to invest in shares of the Fund beyond the limitations of Section 12(d)(1) in reliance on Rule 12d1-4 under the 1940 Act, the registered investment company must, among other things, enter into an agreement with the Trust. Foreign investment companies are permitted to invest in the Fund only up to the limits set forth in Section 12(d)(1), subject to any applicable SEC no-action relief.

Determination of Net Asset Value. The NAV of the Fund normally is determined once daily Monday through Friday, generally as of the close of regular trading hours of the New York Stock Exchange (“NYSE”) (normally 4:00 p.m., Eastern time) on each day that the NYSE is open for trading, based on prices at the time of closing, provided that any Fund assets or liabilities denominated in currencies other than the U.S. dollar are translated into U.S. dollars at the prevailing market rates on the date of valuation as quoted by one or more data service providers. The NAV of the Fund is calculated by dividing the value of the net assets of the Fund (i.e., the value of its total assets less total liabilities) by the total number of outstanding shares of the Fund, generally rounded to the nearest cent.

The value of the securities and other assets and liabilities held by the Fund is determined pursuant to valuation policies and procedures approved by the Board.

Table of Contents

or transact in such securities in smaller odd lot sizes. Odd lots often trade at lower prices than institutional round lots. An amortized cost method of valuation may be used with respect to debt obligations with sixty days or less remaining to maturity unless BFA determines in good faith that such method does not represent fair value.

Dividends and Distributions

Dividends and other distributions on shares of the Fund are distributed on a pro rata basis to beneficial owners of such shares. Dividend payments are made through DTC

Table of Contents

participants and indirect participants to beneficial owners then of record with proceeds received from the Fund.

Taxes on Distributions. Distributions from the Fund’s net investment income (other than qualified dividend income), including distributions out of the Fund’s net short-term capital gains, if any, are taxable to you as ordinary income. Distributions by the Fund of net long-term capital gains, if any, in excess of net short-term capital losses (capital gain dividends) are taxable to you as long-term capital gains, regardless of how long you have held the Fund’s shares. Distributions by the Fund that qualify as qualified dividend income are taxable to you at long-term capital gain rates. However, given the Fund's investment objective and strategies, the Fund generally does not expect its distributions to be treated as qualified dividend income. Long-term capital gains and qualified dividend income are generally eligible for taxation at a maximum rate of 15% or 20% for non-corporate shareholders, depending on whether their income exceeds certain threshold amounts. Because the Fund may have a higher portfolio turnover than funds that seek to replicate the performance of an index, the Fund may, in comparison to such other funds, realize and distribute a higher amount of taxable realized capital gain, the short-term portion of which is taxed at ordinary income tax rates. In addition, a 3.8% U.S. federal Medicare contribution tax is imposed on “net investment income,” including, but not limited to, interest, dividends, and net gain, of U.S. individuals with income exceeding $200,000 (or $250,000 if married and filing jointly) and of estates and trusts.

Table of Contents

distribution requirements, but not in excess of the Fund’s earnings and profits, will be taxable to shareholders and will not constitute nontaxable returns of capital. A return of capital distribution generally will not be taxable but will reduce the shareholder’s cost basis and result in a higher capital gain or lower capital loss when those shares on which the distribution was received are sold. Once a shareholder's cost basis is reduced to zero, further distributions will be treated as capital gain, if the shareholder holds shares of the Fund as capital assets.

Separately, a 30% withholding tax is currently imposed on U.S.-source dividends, interest and other income items paid to (i) foreign financial institutions, including non-U.S. investment funds, unless they agree to collect and disclose to the IRS information regarding their direct and indirect U.S. account holders and (ii) certain other foreign entities, unless they certify certain information regarding their direct and indirect U.S. owners. To avoid withholding, foreign financial institutions will need to (i) enter into agreements with the IRS that state that they will provide the IRS information, including the names, addresses and taxpayer identification numbers of direct and indirect U.S. account holders, comply with due diligence procedures with respect to the identification of U.S. accounts, report to the IRS certain information with respect to U.S. accounts maintained, agree to withhold tax on certain payments made to non-compliant foreign financial institutions or to account holders who fail to provide the required information, and determine certain other information concerning their account holders, or (ii) in the event that an applicable intergovernmental agreement and implementing legislation are adopted, provide local revenue authorities with similar account holder information. Other foreign entities may need to report the

Table of Contents

name, address, and taxpayer identification number of each substantial U.S. owner or provide certifications of no substantial U.S. ownership unless certain exceptions apply.

If your Fund shares are loaned out pursuant to a securities lending arrangement, you may lose the ability to treat Fund dividends paid while the shares are held by the borrower as qualified dividend income. In addition, you may lose the ability to use foreign tax credits passed through by the Fund if your Fund shares are loaned out pursuant to a securities lending agreement.

A creation transaction, which is subject to acceptance by the Distributor and the Fund, generally takes place when an Authorized Participant deposits into the Fund a specified amount of cash in exchange for a specified number of Creation Units. Similarly, shares can be redeemed only in Creation Units, generally for a specified amount of cash and/or a designated portfolio of securities (including any portion of such securities for which cash may be substituted). Except when aggregated in Creation Units, shares are not redeemable by the Fund. Creation and redemption baskets may differ and the Fund may accept “custom baskets.” More information regarding custom baskets is contained in the Fund's SAI.

Table of Contents

different names. Please contact your broker-dealer if you are interested in enrolling in householding and receiving a single copy of prospectuses and other shareholder documents, or if you are currently enrolled in householding and wish to change your householding status.

Distribution

Table of Contents

Financial Highlights

Financial Highlights
(For a share outstanding throughout each period)

	iShares Commodity Curve Carry Strategy ETF
	Year Ended 10/31/21	Period From 09/01/20^(a) to 10/31/20
Net asset value, beginning of period	$19.45	$20.16
Net investment loss^(b)	(0.07)	(0.01)
Net realized and unrealized gain (loss)^(c)	8.98	(0.70)
Net increase (decrease) from investment operations	8.91	(0.71)
Net asset value, end of period	$28.36	$19.45
Total Return^(d)
Based on net asset value	45.81%	(3.52)%^(e)
Ratios to Average Net Assets
Total expenses	0.40%	0.40%^(f)
Total expenses after fees waived	0.39%	0.00%^(f)
Net investment loss	(0.28)%	(0.28)%^(f)
Supplemental Data
Net assets, end of period (000)	$39,710	$29,178
Portfolio turnover rate^(g)	0%	0%^(e)
^(a) Commencement of operations.
^(b) Based on average shares outstanding.
^(c) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.
^(d) Where applicable, assumes the reinvestment of distributions.
^(e) Not annualized.
^(f) Annualized.
^(g) Portfolio turnover rate excludes in-kind transactions.

Table of Contents

Disclaimers

Source ICE Data Indices, LLC is used with permission. ICE^® is a trademark of IDI or its affiliates and BofA^® is a registered trademark of Bank of America Corporation licensed by Bank of America Corporation and its affiliates (“BofA”) and may not be used without BofA’s prior written approval. These trademarks have been licensed, along with the Underlying Index for use by BlackRock, Inc. and its affiliates (“BlackRock”) in connection with the Fund. Neither BlackRock, Inc., the Trust nor the Fund, as applicable, is sponsored, endorsed, sold or promoted by IDI, its affiliates or its third party suppliers (“IDI and its Suppliers”). IDI and its Suppliers make no representations or warranties regarding the advisability of investing in securities generally, in the Fund particularly, the Trust or the ability of the Underlying Index to track general market performance. IDI’s only relationship to BlackRock is the licensing of certain trademarks and trade names and the Underlying Index or components thereof. The Underlying Index is determined, composed and calculated by IDI without regard to BlackRock or the Fund or its holders. IDI has no obligation to take the needs of BlackRock or the holders of the Fund into consideration in determining, composing or calculating the Underlying Index. IDI is not responsible for and has not participated in the determination of the timing of, prices of, or quantities of the Fund to be issued or in the determination or calculation of the equation by which the Fund is to be priced, sold, purchased, or redeemed. Except for certain custom index calculation services, all information provided by IDI is general in nature and not tailored to the needs of BlackRock or any other person, entity or group of persons. IDI has no obligation or liability in connection with the administration, marketing, or trading of the Fund. IDI is not an investment adviser. Inclusion of a security within an index is not a recommendation by IDI to buy, sell, or hold such security, nor is it considered to be investment advice.

IDI AND ITS SUPPLIERS DISCLAIM ANY AND ALL WARRANTIES AND REPRESENTATIONS, EXPRESS AND/OR IMPLIED, INCLUDING ANY WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE, INCLUDING THE UNDERLYING INDEX, INDEX DATA AND ANY INFORMATION INCLUDED IN, RELATED TO, OR DERIVED THEREFROM (“INDEX DATA”). IDI AND ITS SUPPLIERS SHALL NOT BE SUBJECT TO ANY DAMAGES OR LIABILITY WITH RESPECT TO THE ADEQUACY, ACCURACY, TIMELINESS OR COMPLETENESS OF THE UNDERLYING INDEX AND THE INDEX DATA, WHICH ARE PROVIDED ON AN “AS IS” BASIS AND YOUR USE IS AT YOUR OWN RISK.

ICE DATA MAKES NO EXPRESS OR IMPLIED WARRANTIES, AND HEREBY EXPRESSLY DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WITH RESPECT TO THE UNDERLYING INDEX OR ANY DATA INCLUDED THEREIN. IN NO EVENT SHALL ICE DATA HAVE ANY LIABILITY FOR ANY SPECIAL, PUNITIVE, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES (INCLUDING LOST PROFITS), EVEN IF NOTIFIED OF THE POSSIBILITY OF SUCH DAMAGES.

Table of Contents

The licensee's indices and products have not been passed on by BofA as to their legality or suitability, and are not regulated, issued, administered, endorsed, sold, guaranteed, or promoted by BofA. BofA MAKES NO WARRANTIES AND BEARS NO LIABILITY WITH RESPECT TO THE INDICES, ANY RELATED INFORMATION, ITS TRADEMARKS, OR THE PRODUCT(S) (INCLUDING WITHOUT LIMITATION, THEIR QUALITY, ACCURACY, SUIT ABILITY AND/OR COMPLETENESS).

BofA may, from time to time, actively trade in some or all of the components of the referenced index on a spot and forward basis and other contracts and products in or related to the components of the referenced index (including without limitation purchases and sales of futures contracts and options on futures contracts, traded on futures exchanges in the United States and other countries, and commodity options and swaps) both for their proprietary accounts and for the accounts of clients. Trading in the components of the referenced index by BofA may affect the performance of the referenced index. Also, BofA may issue or underwrite other financial instruments with returns linked to the prices of the components of the referenced index, commodities which are included in the referenced index, and derivative instruments that relate to the referenced index. These trading and underwriting activities may affect the level of the referenced index in a manner that may consequently impact the performance of the licensee's products. BofA may engage in hedging activities that could affect the value of the index or components of the referenced index that may consequently impact the performance of the licensee's products. In addition, BofA may purchase or otherwise acquire and dispose of long or short positions in the product. These activities may adversely affect the performance of the licensee's products.

Shares of the Fund are not sponsored, endorsed or promoted by NYSE Arca. NYSE Arca makes no representation or warranty, express or implied, to the owners of shares of the Fund or any member of the public regarding the ability of the Fund to track the total return performance of the Underlying Index or the ability of the Underlying Index to track market performance. NYSE Arca is not responsible for, nor has it participated in, the determination of the compilation or the calculation of the Underlying Index, nor in the determination of the timing of, prices of, or quantities of shares of the Fund to be issued, nor in the determination or calculation of the equation by which the shares are redeemable. NYSE Arca has no obligation or liability to owners of shares of the Fund in connection with the administration, marketing or trading of the shares of the Fund.

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

Want to know more?

iShares.com | 1-800-474-2737

If you have any questions about the Trust or shares of the Fund or you wish to obtain the SAI, Semi-Annual or Annual Report free of charge, please:

Call:	1-800-iShares or 1-800-474-2737 (toll free) Monday through Friday, 8:30 a.m. to 6:30 p.m. (Eastern time)
Email:	iSharesETFs@blackrock.com
Write:	c/o BlackRock Investments, LLC 1 University Square Drive, Princeton, NJ 08540

Investment Company Act File No.: 811-22649

IS-P-CCRV-0322

	March 1, 2022

2022 Prospectus

iShares U.S. ETF Trust

•	iShares Gold Strategy ETF \| IAUF \| CBOE BZX

Table of Contents

Fund Overview	S-1
More Information About the Fund	1
A Further Discussion of Principal Risks	2
A Further Discussion of Other Risks	17
Portfolio Holdings Information	19
Management	19
Shareholder Information	22
Distribution	30
Financial Highlights	31
Disclaimers	32

Bloomberg Index Services Limited and its affiliates (collectively, “Bloomberg”) are not affiliated with BlackRock Fund Advisors or its affiliates and do not approve, endorse, review, or recommend the iShares Gold Strategy ETF. Bloomberg and the Bloomberg Composite Gold Index are trademarks or service marks of Bloomberg and have been licensed to BlackRock Fund Advisors or its affiliates. Bloomberg does not guarantee the timeliness, accurateness, or completeness of any data or information relating to the Bloomberg Composite Gold Index and shall not be liable in any way to the BlackRock Fund Advisors or its affiliates, investors in iShares Gold Strategy ETF or other third parties in respect of the use or accuracy of the Bloomberg Composite Gold Index or any data included therein.

iShares^® and BlackRock^® are registered trademarks of BlackRock Fund Advisors and its affiliates.

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

iSHARES^® GOLD STRATEGY ETF

Ticker: IAUF

Stock Exchange: Cboe BZX

Investment Objective

The iShares Gold Strategy ETF (the “Fund”) seeks to track the investment results of an index that provides exposure, on a total return basis, to the price performance of gold.

Fees and Expenses

The following table describes the fees and expenses that you will incur if you buy, hold and sell shares of the Fund. The investment advisory agreement between iShares U.S. ETF Trust (the “Trust”) and BlackRock Fund Advisors (“BFA”) (the “Investment Advisory Agreement”) provides that BFA will pay all operating expenses of the Fund, except: (i) the management fees, (ii) interest expenses, (iii) taxes, (iv) expenses incurred with respect to the acquisition, and disposition of portfolio securities, commodities or other financial instruments and the execution of portfolio transactions, including brokerage commissions, (v) distribution fees or expenses, and (vi) litigation expenses and any extraordinary expenses. The Fund may incur “Acquired Fund Fees and Expenses.” Acquired Fund Fees and Expenses reflect the Fund's pro rata share of the fees and expenses incurred by investing in other investment products. The impact of Acquired Fund Fees and Expenses is included in the total returns of the Fund. BFA, the investment adviser to the Fund, has contractually agreed to waive a portion of its management fees in an amount equal to the Acquired Fund Fees and Expenses, if any, attributable to the Fund's investments in other exchange-traded products (“ETPs”) sponsored by BFA or its affiliates and other funds advised by BFA or its affiliates through February 29, 2024, provided that the waiver be no greater than the Fund's management fee of 0.25%. The contractual waiver may be terminated prior to February 29, 2024 only upon written agreement of the Trust and BFA.

You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Annual Fund Operating Expenses
(ongoing expenses that you pay each year as a
percentage of the value of your investments)

Management
Fees

Distribution
and
Service (12b-1)
Fees

Other
Expenses

Acquired Fund
Fees
and Expenses

Total Annual
Fund
Operating
Expenses

Fee Waiver

Total Annual
Fund
Operating
Expenses
After
Fee Waiver

0.25%

None

0.10%

0.35%

0.10%

0.25%

S-1

Table of Contents

1 Year		3 Years		5 Years		10 Years
$26		$92		$176		$423

Portfolio Turnover. The Fund may pay transaction costs, such as commissions, when it buys and sells securities or other assets (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 121% of the average value of its portfolio.

Principal Investment Strategies

The Fund seeks to track the investment results of the Bloomberg Composite Gold Index (the “Underlying Index”), which is designed to track the price performance of gold. The Underlying Index is composed of exchange-traded gold futures contracts and one or more ETPs backed by or linked to physical gold, as determined by Bloomberg Index Services Limited (the “Index Provider”), and is rebalanced on a quarterly basis.

In seeking to achieve its investment objective, the Fund invests in a combination of (i) exchange-traded gold futures contracts and other exchange-traded or over-the-counter (“OTC”)

derivatives (i.e., forward contracts, futures, options and swaps) that correlate to the investment returns of physical gold, based on the notional value of such derivative instruments; and (ii) ETPs backed by or linked to physical gold, which may include the iShares Gold Trust (the “Gold Trust”) ((i) and (ii) together, the “Gold Investments”). The Gold Trust, whose assets consist primarily of gold held by a custodian on behalf of the Gold Trust, seeks to reflect generally the performance of the price of gold. The Fund may invest up to 20% of the Fund's assets in OTC derivatives. The Fund additionally aims to generate interest income and capital appreciation through a cash management strategy consisting primarily of cash and cash equivalents and short-term government obligations (collectively, “Fixed-Income Investments”).

The ETPs held by the Fund may invest in physical gold bullion or OTC or exchange-traded derivatives on gold bullion, such as forward contracts, futures, options and swaps. The ETPs held by the Fund may be sponsored by an affiliate of BFA or by an unaffiliated entity, and may be structured as, among others, exchange-traded commodities that track the price of gold or exchange-traded notes with interest and/or

S-2

Table of Contents

principal payments linked to the price of gold. As of October 31, 2021, the Underlying Index was composed of 3 components.

The Fund seeks to gain exposure to the Gold Investments by investing through a wholly-owned subsidiary organized in the Cayman Islands (the “Subsidiary”). The Subsidiary is advised by BFA and has the same investment objective as the Fund. Unlike the Fund, the Subsidiary is not an investment company registered under the Investment Company Act of 1940, as amended (the “1940 Act”). The Subsidiary invests solely in the Gold Investments and cash and cash equivalents.

In compliance with Subchapter M of the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”), the Fund may invest up to 25% of its total assets in the Subsidiary. The Fund’s Gold Investments held in the Subsidiary are intended to provide the Fund with exposure to the gold market consistent with current U.S. federal income tax laws applicable to investment companies such as the Fund, which limit the ability of investment companies to invest directly in the Gold Investments.

The remainder of the Fund’s assets is invested directly by the Fund, primarily in Fixed-Income Investments, including repurchase agreements, money market instruments, U.S. government and agency securities, treasury inflation-protected securities and sovereign debt obligations of non-U.S. countries. The Fund invests in Fixed-Income Investments for investment purposes and to collateralize the Subsidiary’s investments in derivatives.

S-3

Table of Contents

invests more than a prescribed level of its net asset value in CFTC-regulated futures, options and swaps, or if a registered investment company markets itself as providing investment exposure to such instruments. Due to the Fund's potential use of CFTC-regulated futures, options and swaps above the prescribed levels, it is considered a “commodity pool” under the Commodity Exchange Act (“CEA”).

Summary of Principal Risks

Authorized Participant Concentration Risk. Only an Authorized Participant (as defined in the Creations and Redemptions section of this prospectus (the “Prospectus”)) may engage in

creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting.

S-4

Table of Contents

movements. The prices of commodity-linked investments may fluctuate quickly and dramatically as a result of changes affecting a particular commodity and may not correlate to price movements in other asset classes, such as stocks, bonds and cash. Commodity-linked derivatives are subject to the risk that the counterparty to the transaction, the exchange or trading facility on which they trade or the applicable clearing house may default or otherwise fail to perform. The Fund’s use of commodity-linked derivatives may also have a leveraging effect on the Fund’s portfolio because of the leverage inherent in the use of derivatives. Leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the Fund would otherwise have had. The Fund is required to post margin with respect to its holdings in derivatives. Each of these factors and events could have a significant negative impact on the Fund. The Fund is specifically exposed to the Risk of Investing in Gold.

Commodity Regulatory Risk. The Fund and the Subsidiary are deemed commodity pools and BFA is considered a “commodity pool operator” with respect to the Fund and the Subsidiary under the CEA. BFA is therefore subject to regulation by the SEC and the CFTC. BFA is also subject to regulation by the National Futures Association (“NFA”). The regulatory requirements governing the use of commodity futures, options, certain swaps or certain other investments could change at any time.

Concentration Risk. The Fund may be susceptible to an increased risk of loss, including losses due to adverse events that affect the Fund’s investments more

than the market as a whole, to the extent that the Fund's investments are concentrated in the securities and/or other assets of a particular issuer or issuers, country, group of countries, region, market, industry, group of industries, sector, market segment or asset class.

Cybersecurity Risk. Failures or breaches of the electronic systems of the Fund, the Fund's adviser, distributor,

S-5

Table of Contents

the Index Provider and other service providers, market makers, Authorized Participants or the issuers of securities in which the Fund invests have the ability to cause disruptions, negatively impact the Fund’s business operations and/or potentially result in financial losses to the Fund and its shareholders. While the Fund has established business continuity plans and risk management systems seeking to address system breaches or failures, there are inherent limitations in such plans and systems. Furthermore, the Fund cannot control the cybersecurity plans and systems of the Fund’s Index Provider and other service providers, market makers, Authorized Participants or issuers of securities in which the Fund invests.

Fund to value accurately. The Fund could also suffer losses related to its derivatives positions as a result of unanticipated market movements, or movements between the time of periodic reallocations of Fund assets, which losses are potentially unlimited. Certain derivatives may give rise to a form of leverage and may expose the Fund to greater risk and increase its costs. The impact of U.S. and global regulation of derivatives may make derivatives more costly, may limit the availability of derivatives, may delay or restrict the exercise by the Fund of termination rights or remedies upon a counterparty default under derivatives held by the Fund (which could result in losses), or may otherwise adversely affect the value or performance of derivatives.

Financials Sector Risk. Performance of companies in the financials sector may be adversely impacted by many factors, including, among others, changes in government regulations, economic conditions, and interest rates, credit rating downgrades, and decreased liquidity in credit markets. The extent to which the Fund may invest in a company that engages in securities-related activities or banking is limited by applicable law. The impact of changes in capital requirements and recent or future regulation of any individual financial company, or of the financials sector as a whole, cannot be predicted. In recent years, cyberattacks and technology malfunctions and failures have become increasingly frequent in this sector and have caused significant losses to companies in this sector, which may negatively impact the Fund.

Futures Contract Risk. Futures are standardized, exchange-traded contracts that obligate a purchaser to

S-6

Table of Contents

take delivery, and a seller to make delivery, of a specific amount of an asset at a specified future date at a specified price. Unlike equities, which typically entitle the holder to a continuing ownership stake in an issuer, futures contracts normally specify a certain date for settlement in cash based on the level of the reference rate. The primary risks associated with the use of futures contracts are: (i) the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; (ii) possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; (iii) losses caused by unanticipated market movements, which are potentially unlimited; (iv) BFA’s inability to predict correctly the direction of prices and other economic factors; and (v) the possibility that the counterparty will default in the performance of its obligations. To the extent that the Fund invests in rolling futures contracts, it may be subject to additional risk.

High Portfolio Turnover Risk. High portfolio turnover (considered by the Fund to mean higher than 100% annually) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities or other assets and on reinvestment in other securities.

Income Risk. The Fund’s income may decline when yields fall. This decline can occur because the Fund may subsequently invest in lower-yielding bonds as bonds in its portfolio mature, are near maturity or are called, or the Fund otherwise needs to purchase additional bonds.

S-7

Table of Contents

Issuer Risk. The performance of the Fund depends on the performance of individual securities or other assets to which the Fund has exposure. The Fund may be adversely affected if an issuer of underlying securities held by the Fund is

unable or unwilling to repay principal or interest when due. Changes in the financial condition or credit rating of an issuer of those securities or assets may cause the value of the securities or assets to decline.

Management Risk. As the Fund will not fully replicate the Underlying Index, it is subject to the risk that BFA's investment strategy may not produce the intended results.

Market Trading Risk. The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, periods of high volatility and disruptions in the creation/redemption process. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

S-8

Table of Contents

guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. It is possible to lose money by investing in a money market fund. Money market funds other than government money market funds or retail money market funds “float” their NAV instead of using a stable $1.00 per share price.

Non-Diversification Risk. The Fund may invest a large percentage of its assets in securities issued by or representing a small number of issuers. As a result, the Fund's performance may depend on the performance of a small number of issuers.

Passive Investment Risk. The Fund is not actively managed, and BFA generally does not attempt to take defensive positions under any market conditions, including declining markets.

Risk of Investing in ETPs. Through the Fund’s investments in ETPs, which may be affiliated or unaffiliated with the Fund, the Fund is subject to the risks associated with the ETPs’ investments. The Fund’s exposure to particular risks of an ETP generally will be proportionate to the Fund’s allocation to the ETP. To the extent the Fund invests a portion of

its assets in the Gold Trust, which seeks to reflect generally the performance of the price of gold, the Fund is subject to the risks associated with the Gold Trust, including the possibility that the market price of its shares could decrease. The value of the Fund’s investment in the Gold Trust may fluctuate, sometimes rapidly or unpredictably. The Gold Trust is sponsored by an affiliate of BFA that receives a fee in exchange for assuming certain administrative and marketing expenses of the Gold Trust, which may create a conflict of interest for BFA in determining whether, and under what circumstances, to purchase or sell shares in the Gold Trust.

Risk of Investing in Gold. The Fund has a substantial exposure to gold through its investments in the Gold Investments. Thus, the Fund’s portfolio may be adversely affected by changes or trends in the price of gold. The price of gold and of gold-related instruments historically has been volatile, which may adversely affect the value of Gold Investments. Governments, central banks, or other larger holders can influence the production and sale of gold, which may adversely affect the performance of the Fund.

S-9

Table of Contents

significant impact on the prices of precious metals.

Small Fund Risk. When the Fund’s size is small, the Fund may experience low trading volume and wide bid/ask spreads. In addition, the Fund may face the risk of being delisted if the Fund does not meet certain conditions of the listing exchange. Any resulting liquidation of the Fund could cause the Fund to incur elevated transaction costs for the Fund and negative tax consequences for its shareholders.

investor protections of the 1940 Act. Changes in the laws of the U.S. and/or the Cayman Islands could result in the inability of the Fund and/or the Subsidiary to operate as described in the Prospectus and the Statement of Additional Information (“SAI”), and could adversely affect the Fund.

S-10

Table of Contents

transaction costs incurred by the Fund, the Fund ’s holding of uninvested cash, differences in timing of the accrual of or the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be heightened during times of increased market volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX ETFs THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN FUTURES CONTRACTS ISSUERS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

Valuation Risk. The price the Fund could receive upon the sale of a security

or other asset may differ from the Fund's valuation of the security or other asset, particularly for securities or other assets that trade in low volume or volatile markets or that are valued using a fair value methodology as a result of trade suspensions or for other reasons. In addition, the value of the securities or other assets in the Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund's shares. Authorized Participants who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities or other instruments may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or other instruments or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

S-11

Table of Contents

Performance Information

Year by Year Returns (Years Ended December 31)

The best calendar quarter return during the periods shown above was 11.85% in the 2nd quarter of 2020; the worst was -9.98% in the 1st quarter of 2021.

Updated performance information, including the Fund’s current NAV, may be obtained by visiting our website at www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).

S-12

Table of Contents

Average Annual Total Returns

(for the periods ended December 31, 2021)

	One Year	Since Fund Inception
(Inception Date: 6/6/2018)
Return Before Taxes	-4.61%	8.53%
Return After Taxes on Distributions¹	-4.61%	6.35%
Return After Taxes on Distributions and Sale of Fund Shares¹	-2.73%	5.65%
Bloomberg Composite Gold Index (Index returns do not reflect deductions for fees, expenses, or taxes)	-4.24%	8.76%

S-13

Table of Contents

Management

Investment Adviser. BlackRock Fund Advisors.

Purchase and Sale of Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

S-14

Table of Contents

More Information About the Fund

BFA is the investment adviser to the Fund. Shares of the Fund are listed for trading on Cboe BZX Exchange, Inc. (“Cboe BZX”). The market price for a share of the Fund may be different from the Fund’s most recent NAV.

Table of Contents

An investment in the Fund is not a bank deposit and it is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, BFA or any of its affiliates.

The Fund's investment objective and the Underlying Index may be changed without shareholder approval.

A Further Discussion of Principal Risks

Calculation Methodology Risk. The Underlying Index relies on various sources of information to assess the criteria of issuers included in the Underlying Index, including information that may be based on assumptions and estimates. Neither the Fund nor BFA can offer assurances that the Underlying Index's calculation methodology or sources of information will provide an accurate assessment of included issuers.

Table of Contents

Commodity-Linked Derivatives Risk. The value of a commodity-linked derivative instrument typically is based upon the price movements of the underlying commodity or an economic variable linked to such price movements. Therefore, the value of commodity-linked derivative instruments may be affected by changes in overall economic conditions, interest rates, or factors affecting a particular commodity or industry. The prices of commodity-related investments may fluctuate quickly and dramatically as a result of changes affecting a particular commodity and may or may not correlate to price movements in other asset classes, such as stocks, bonds and cash. Investments in commodity-linked derivatives may be subject to greater volatility than non-derivative based investments because of the leverage inherent in the use of derivatives. A highly liquid secondary market may not exist for certain commodity-linked derivatives, and there can be no assurance that one will develop. Commodity-linked derivatives also may be subject to credit and interest rate risks that in general affect the values of fixed-income securities. Commodity-linked derivatives are subject to the risk that the counterparty to the transaction, the exchange or trading facility on which they trade or the applicable clearing house may default or otherwise fail to perform. In addition, each exchange or trading facility on which derivatives are traded has the right to suspend or limit trading in all futures or other instruments that it lists. The Fund’s use of commodity-linked derivatives can result in large amounts of financial leverage. Although the Fund will not borrow money in order to increase the amount of its trading, the low margin deposits normally required in futures trading permit a high degree of leverage on the investment itself. Accordingly, a relatively small price movement in a futures contract may result in immediate and substantial losses to the Fund. Like other leveraged investments, any trade may result in losses in excess of the amount invested. Each of these factors and events could have a significant negative impact on the Fund.

Commodity Regulatory Risk. The Fund and the Subsidiary are deemed “commodity pools” and BFA is considered a “commodity pool operator” with respect to the Fund under the CEA. BFA is therefore subject to regulation by the SEC and the CFTC. BFA is also subject to regulation by the NFA. The regulatory requirements governing the use of commodity futures, options, certain swaps or certain other investments could change at any time.

Table of Contents

sector, market segment or asset class. The Fund may be more adversely affected by the underperformance of those securities and/or other assets, may experience increased price volatility and may be more susceptible to adverse economic, market, political or regulatory occurrences affecting those securities and/or other assets than a fund that does not concentrate its investments.

Counterparty Risk. Certain commodity-linked derivative instruments, swap agreements and other forms of financial instruments that involve counterparties subject the Fund to the risk that the counterparty could default on its obligations under the agreement, either through the counterparty’s bankruptcy or failure to perform its obligations. In the event of a counterparty default, the Fund could experience lengthy delays in recovering some or all of its assets or obtain no recovery at all. The Fund may deposit funds required to margin open positions in the derivative instruments subject to the CEA with a clearing broker registered as an FCM, which is an entity that solicits or accepts orders to buy or sell commodity futures, options, swaps or forward contracts and accepts money or other assets from customers to support such orders. The FCM could default on an obligation set forth in an agreement between the Fund and the FCM, including the FCM’s obligation to return margin posted in connection with the Fund’s futures contracts. If a counterparty defaults on its payment obligations, the Fund will lose money and the value of an investment in Fund shares may decrease. In addition, the Fund may engage in such investment transactions with a limited number of counterparties, which may increase the Fund’s exposure to counterparty credit risk.

Table of Contents

unauthorized access, such as causing denial-of-service attacks on websites (i.e., efforts to make network services unavailable to intended users). Recently, geopolitical tensions may have increased the scale and sophistication of deliberate attacks, particularly those from nation-states or from entities with nation-state backing.

Cybersecurity failures by, or breaches of, the systems of the Fund's adviser, distributor and other service providers (including, but not limited to, index and benchmark providers, fund accountants, custodians, transfer agents and administrators), market makers, Authorized Participants or the issuers of securities in which the Fund invests have the ability to cause disruptions and impact business operations, potentially resulting in: financial losses, interference with the Fund’s ability to calculate its NAV, disclosure of confidential trading information, impediments to trading, submission of erroneous trades or erroneous creation or redemption orders, the inability of the Fund or its service providers to transact business, violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, reimbursement or other compensation costs, or additional compliance costs. In addition, cyberattacks may render records of Fund assets and transactions, shareholder ownership of Fund shares, and other data integral to the functioning of the Fund inaccessible, inaccurate or incomplete. Substantial costs may be incurred by the Fund in order to resolve or prevent cyber incidents in the future. While the Fund has established business continuity plans in the event of, and risk management systems to prevent, such cyber incidents, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, that prevention and remediation efforts will not be successful or that cyberattacks will go undetected. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund, issuers in which the Fund invests, the Index Provider, market makers or Authorized Participants. The Fund and its shareholders could be negatively impacted as a result.

Derivatives Risk. The Fund’s use of derivatives may reduce the Fund’s returns or increase volatility. Volatility is defined as the characteristic of a security, a currency, an index or a market to fluctuate significantly in price within a short time period. Derivatives may also be subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. Counterparty risk for OTC derivatives is generally higher than that for derivatives traded on an exchange or through a clearing house. A risk of the Fund’s use of derivatives is that the fluctuations in their values may not correlate perfectly with the value of the underlying asset, the performance of the asset class to which the Fund seeks exposure or the performance of the overall markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. The Fund could also suffer losses related to its derivatives positions as a result of unanticipated market movements, or movements between the time of periodic reallocations of Fund assets, which losses are potentially unlimited. Certain derivatives may give rise to a form of leverage and may expose the Fund to greater risk and increase its costs. The impact of U.S. and global regulation of derivatives may make derivatives more costly, may limit the availability of derivatives, may delay or restrict the exercise by the Fund of termination rights or remedies upon a

Table of Contents

counterparty default under derivatives held by the Fund (which could result in losses), or may otherwise adversely affect the value or performance of derivatives.

Financials Sector Risk. Companies in the financials sector of an economy are subject to extensive governmental regulation and intervention, which may adversely affect the scope of their activities, the prices they can charge, the amount of capital they must maintain and, potentially, their size. The extent to which the Fund may invest in a company that engages in securities-related activities or banking is limited by applicable law. Governmental regulation may change frequently and may have significant adverse consequences for companies in the financials sector, including effects not intended by such regulation. Recently enacted legislation in the U.S. has relaxed capital requirements and other regulatory burdens on certain U.S. banks. While the effect of the legislation may benefit certain companies in the financials sector, increased risk taking by affected banks may also result in greater overall risk in the U.S. and global financials sector. The impact of changes in capital requirements, or recent or future regulation in various countries, on any individual financial company or on the financials sector as a whole cannot be predicted.

Certain risks may impact the value of investments in the financials sector more severely than those of investments outside this sector, including the risks associated with companies that operate with substantial financial leverage. Companies in the financials sector are exposed directly to the credit risk of their borrowers and counterparties, who may be leveraged to an unknown degree, including through swaps and other derivatives products. Financial services companies may have significant exposure to the same borrowers and counterparties, with the result that a borrower’s or counterparty’s inability to meet its obligations to one company may affect other companies with exposure to the same borrower or counterparty. This interconnectedness of risk may result in significant negative impacts to companies with direct exposure to the defaulting counterparty as well as adverse cascading effects in the markets and the financials sector generally. Companies in the financials sector may also be adversely affected by increases in interest rates and loan losses, decreases in the availability of money or asset valuations, credit rating downgrades and adverse conditions in other related markets. Insurance companies, in particular, may be subject to severe price competition and/or rate regulation, which may have an adverse impact on their profitability. The financials sector is particularly sensitive to fluctuations in interest rates. The financials sector is also a target for cyberattacks, and may experience technology malfunctions and disruptions. In recent years, cyberattacks and technology malfunctions and failures have become increasingly frequent in this sector and have reportedly caused losses to companies in this sector, which may negatively impact the Fund.

Table of Contents

secondary market for a futures contract and the resulting inability to close a futures contract when desired; (iii) losses caused by unanticipated market movements, which are potentially unlimited; (iv) BFA's inability to predict correctly the direction of prices and other economic factors; and (v) the possibility that the counterparty will default in the performance of its obligations. To the extent that the Fund invests in rolling futures contracts, it may be subject to additional risk. As the futures contracts approach expiration, they may be replaced by similar contracts that have a later expiration. This process is referred to as “rolling.” If the market for these contracts is in “contango,” meaning that the prices of futures contracts in the nearer months are lower than the price of contracts in the distant months, the sale of the near-term month contract would be at a lower price than the longer-term contract, resulting in a cost to “roll” the futures contract. The actual realization of a potential roll cost will be dependent upon the difference in price of the near and distant contracts. The Fund may not “roll” the futures contracts on a predefined schedule as they approach expiration; instead BFA may determine to roll to another futures contract in an attempt to generate maximum yield. There can be no guarantee that such a strategy will produce the desired results.

Income Risk. The Fund’s income may decline if yields fall because the Fund may hold a significant portion of short duration securities and/or securities that have floating or variable interest rates. The Fund’s income may decline because the Fund invests in lower yielding bonds as bonds in its portfolio mature, are near maturity or are called, or when the Fund needs to purchase additional bonds.

Table of Contents

incorrect constituents, the Fund would have market exposure to such constituents and would be underexposed to the Underlying Index’s other constituents. Shareholders should understand that any gains from Index Provider errors will be kept by the Fund and its shareholders and any losses or costs resulting from Index Provider errors will be borne by the Fund and its shareholders.

Unusual market conditions may cause the Index Provider to postpone a scheduled rebalance to the Underlying Index, which could cause the Underlying Index to vary from its normal or expected composition. The postponement of a scheduled rebalance in a time of market volatility could mean that constituents of the Underlying Index that would otherwise be removed at rebalance due to changes in market capitalizations , issuer credit ratings, or other reasons may remain, causing the performance and constituents of the Underlying Index to vary from those expected under normal conditions. Apart from scheduled rebalances, the Index Provider or its agents may carry out additional ad hoc rebalances to the Underlying Index due to reaching certain weighting constraints, unusual market conditions or corporate events or, for example, to correct an error in the selection of index constituents. When the Underlying Index is rebalanced and the Fund in turn rebalances its portfolio to attempt to increase the correlation between the Fund’s portfolio and the Underlying Index, any transaction costs and market exposure arising from such portfolio rebalancing will be borne directly by the Fund and its shareholders. Therefore, errors and additional ad hoc rebalances carried out by the Index Provider or its agents to the Underlying Index may increase the costs to and the tracking error risk of the Fund.

■

Market Volatility. The outbreak has also resulted in extreme volatility, severe losses, and disruptions in markets which can adversely impact the Fund and its investments, including impairing hedging activity to the extent the Fund engages in such activity, as expected correlations between related markets or instruments may no longer apply. In addition, to the extent the Fund invests in short-term instruments that have negative yields, the Fund’s value may be impaired as a result. Certain issuers of equity securities have cancelled or announced the suspension of

Table of Contents

	dividends. The outbreak has, and may continue to, negatively affect the credit ratings of some fixed-income securities and their issuers.
■	Market Closures. Certain local markets have been or may be subject to closures, and there can be no assurance that trading will continue in any local markets in which the Fund may invest, when any resumption of trading will occur or, once such markets resume trading, whether they will face further closures. Any suspension of trading in markets in which the Fund invests will have an impact on the Fund and its investments and will impact the Fund’s ability to purchase or sell securities in such markets.
■	Operational Risk. The outbreak could also impair the information technology and other operational systems upon which the Fund’s service providers, including BFA, rely, and could otherwise disrupt the ability of employees of the Fund's service providers to perform critical tasks relating to the Fund, for example, due to the service providers’ employees performing tasks in alternate locations than under normal operating conditions or the illness of certain employees of the Fund's service providers.
■	Governmental Interventions. Governmental and quasi-governmental authorities and regulators throughout the world have responded to the outbreak and the resulting economic disruptions with a variety of fiscal and monetary policy changes, including direct capital infusions into companies and other issuers, new monetary policy tools, and lower interest rates. An unexpected or sudden reversal of these policies, or the ineffectiveness of such policies, is likely to increase market volatility, which could adversely affect the Fund’s investments.
■	Pre-Existing Conditions. Public health crises caused by the outbreak may exacerbate other pre-existing political, social and economic risks in certain countries or globally, which could adversely affect the Fund and its investments and could result in increased premiums or discounts to the Fund's NAV.

Other infectious illness outbreaks that may arise in the future could have similar or other unforeseen effects.

Table of Contents

income dealer market-making capacity may lead to lower trading volume, heightened volatility, wider bid-ask spreads and less transparent pricing in certain fixed-income markets.

Table of Contents

market movements or uncertainty. The value of a security or other asset may decline due to changes in general market conditions, economic trends or events that are not specifically related to the issuer of the security or other asset, or factors that affect a particular issuer or issuers, country, group of countries, region, market, industry, group of industries, sector or asset class. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund and its investments and could result in increased premiums or discounts to the Fund’s NAV. During a general market or commodity market downturn, multiple asset classes may be negatively affected. Changes in market conditions and interest rates generally do not have the same impact on all types of securities and instruments.

Market Trading Risk.

Table of Contents

Shares of the Fund May Trade at Prices Other Than NAV. Shares of the Fund trade on stock exchanges at prices at, above or below the Fund’s most recent NAV. The NAV of the Fund is calculated at the end of each business day and fluctuates with changes in the market value of the Fund’s holdings. The trading price of the Fund's shares fluctuates continuously throughout trading hours based on both market supply of and demand for their shares and the underlying value of their portfolio holdings or NAV. As a result, the trading prices of the Fund’s shares may deviate significantly from NAV during periods of market volatility, including during periods of significant redemption requests or other unusual market conditions. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV. However, because shares can be created and redeemed in Creation Units at NAV, BFA believes that large discounts or premiums to the NAV of the Fund are not likely to be sustained over the long term (unlike shares of many closed-end funds, which frequently trade at appreciable discounts from, and sometimes at premiums to, their NAVs). While the creation/redemption feature is designed to make it more likely that the Fund’s shares normally will trade on stock exchanges at prices close to the Fund’s next calculated NAV, exchange prices are not expected to correlate exactly with the NAV due to timing reasons, supply and demand imbalances and other factors. In addition, disruptions to creations and redemptions, including disruptions at market makers, Authorized Participants, or other market participants, and during periods of significant market volatility, may result in trading prices for shares of the Fund that differ significantly from its NAV. Authorized Participants may be less willing to create or redeem Fund shares if there is a lack of an active market for such shares or its underlying investments, which may contribute to the Fund’s shares trading at a premium or discount to NAV.

Money Market Instruments Risk. The value of money market instruments may be affected by changing interest rates and by changes in the credit ratings of the investments. If a significant amount of the Fund's assets are invested in money market instruments, it will be more difficult for the Fund to achieve its investment objective. An investment in a money market fund is not insured or guaranteed by the FDIC or any other government agency. It is possible to lose money by investing in a money market

Table of Contents

fund. Money market funds other than government money market funds or retail money market funds “float” their NAV instead of using a stable $1.00 per share price.

Non-Diversification Risk. The Fund is classified as “non-diversified.” This means that the Fund may invest a large percentage of its assets in securities issued by or representing a small number of issuers. As a result, the Fund may be more susceptible to the risks associated with these particular issuers or to a single economic, political or regulatory occurrence affecting these issuers.

Operational Risk. The Fund is exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund's service providers, counterparties or other third parties, failed or inadequate processes and technology or systems failures. The Fund and BFA seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

Risk of Investing in ETPs. Through the Fund’s investments in ETPs, which may be affiliated or unaffiliated with the Fund, the Fund is subject to the risks associated with the ETPs’ investments, including the possibility that the value of the gold held by or linked to an ETP could decrease. An ETP’s investment in OTC or exchange-traded derivatives on gold bullion will subject the Fund to risks associated with investments in derivatives.

The Fund has no control over the investments and related risks taken by the ETPs in which it invests. Thus, the Fund’s exposure to particular risks of an ETP generally will be proportionate to the Fund’s allocation to the ETP. The ETPs in which the Fund may invest may be passive investment vehicles. In such cases, their shares may be adversely affected by losses that, if actively managed, might have been possible to avoid.

The price of ETP shares is subject to the risks associated with investing in the securities market. This means that the price of ETP shares owned by the Fund may fluctuate, sometimes rapidly or unpredictably. The value of the Fund’s investment in ETPs is generally based on secondary market prices and, as such, the Fund may suffer losses due to developments in the securities markets, the failure of an active trading market to develop, trading halts or de-listings. The ETPs in which the Fund may invest may decline in value due to factors affecting securities markets generally or the price of gold and may trade at prices, above or below their NAV, that fluctuate with changes in the market value of gold. Although ETPs are listed for trading on a market, a lack of an active trading market may result in losses on investment at the time of disposition of ETP shares.

An investment in the Fund may entail more direct and indirect costs and expenses than a direct investment in an ETP. For example, the Fund may indirectly pay a portion of the

Table of Contents

expenses (including operating expenses and management fees) incurred by the underlying ETPs in addition to its own expenses. To the extent that the expense ratio of an ETP in which the Fund invests changes or the Fund’s allocation among the ETPs changes from time to time, the weighted average operating expenses borne by the Fund may increase or decrease.

BFA may also receive management or other fees paid by its affiliated ETPs. Because the amount of the fees to be retained by BFA may differ depending upon the ETPs in which the Fund invests, there may be a conflict of interest for BFA in selecting affiliated ETPs. In addition, BFA may have an incentive to take into account the effect on an affiliated ETP in which the Fund may invest in determining whether, and under what circumstances, to purchase or sell shares in that affiliated ETP. BFA may receive greater compensation in connection with an affiliated ETP than with an unaffiliated ETP. Any differential in compensation may create a financial incentive on the part of BFA in selecting an affiliated ETP over an unaffiliated ETP.

Risk of Investing in the Gold Trust. To the extent the Fund invests a portion of its assets in the Gold Trust, which seeks to reflect generally the performance of the price of gold, the Fund is subject to the risks associated with the Gold Trust, including the possibility that the market price of its shares could decrease. The value of the Fund’s investment in the Gold Trust may fluctuate, sometimes rapidly or unpredictably.

The value of Gold Trust’s shares may be adversely affected by actual or perceived disruptions or lack of confidence in the gold price benchmark used to value the Gold Trust’s gold. The amount of gold represented by each of its shares will decrease over the life of the Gold Trust due to the sales of gold necessary to pay the fees of the Gold Trust’s sponsor and the Gold Trust’s expenses not otherwise assumed by the Gold Trust’s sponsor. Without increases in the price of gold sufficient to compensate for that decrease, the price of the Gold Trust’s shares will also decline.

The Gold Trust is not registered as an investment company for purposes of federal securities laws and is not a commodity pool for purposes of the CEA. As such, the Fund, as an owner of beneficial interests in the shares of the Gold Trust, does not have the protections normally associated with ownership of shares in an investment company registered under the 1940 Act or the protections afforded by the CEA.

The Gold Trust is sponsored by an affiliate of BFA that receives a fee in exchange for assuming certain administrative and marketing expenses of the Gold Trust, which may create a conflict of interest for BFA in determining whether, and under what circumstances, to purchase or sell shares in the Gold Trust.

Risk of Investing in Gold. The Fund has a substantial exposure to gold through its investments in the Gold Investments. Thus, the Fund’s portfolio may be adversely affected by changes or trends in the price of gold. The price of gold and of gold-related instruments historically has been volatile. Governments, central banks, or other large holders can influence the production and sale of gold, which may adversely affect the supply and price of gold, and thus, the performance of the Fund. Unpredictable economic, financial, social, and political factors may also affect the price of gold.

Investments related to gold are considered to be speculative. The price of gold may fluctuate sharply over short periods of time due to, among other things: (i) changes in

Table of Contents

inflation or expectations regarding inflation in various countries; (ii) the availability of supply; (iii) changes in demand; (iv) investment speculation and political uncertainty; and (v) monetary and other economic policies of various governments.

The Fund also invests in gold bullion through ETPs. Gold bullion may depreciate in value and does not generate income, unlike many other investments, which may pay interest or dividends or make other current payments. Also, as compared to other investments, ETPs may have higher custody and transaction costs.

Additionally, increased environmental or labor costs may depress the value of mining and metal investments.

Table of Contents

pricing risk (i.e., swaps may be difficult to value). Swaps may be subject to illiquidity risk, and it may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses. Certain standardized swaps are subject to mandatory central clearing. Central clearing is expected to reduce counterparty credit risk and increase liquidity, but central clearing does not make swap transactions risk-free. All swaps require posting of collateral, which may restrict the ability of the Fund to invest the assets in different ways and which involve costs to the Fund. Swaps provide customized contractual terms, which may not, in all cases, provide the hedging or other intended benefits.

Subsidiary Risk. In compliance with Subchapter M of the Internal Revenue Code, the Fund may invest up to 25% of its total assets in the Subsidiary, as determined at the end of each of the Fund’s fiscal quarters. By investing in a Subsidiary, the Fund is indirectly exposed to the risks associated with the Subsidiary’s investments. The Gold Investments that may be held by the Subsidiary are generally similar to those that are permitted to be held by the Fund and are subject to the same risks that apply to similar investments if held directly by the Fund. There can be no assurance that the investment objective of the Subsidiary will be achieved. The Subsidiary is not registered under the 1940 Act, and, unless otherwise noted in the Prospectus, is not subject to the investor protections of the 1940 Act. The Trust’s Board of Trustees (the “Board”) has oversight responsibility for the investment activities of the Fund, including its investment in the Subsidiary, and the Fund’s role as sole shareholder of the Subsidiary. The Subsidiary’s financial statements are consolidated with the Fund’s financial statements that are included in the Fund’s Annual and Semi-Annual Reports to shareholders.

Table of Contents

example, the Cayman Islands does not currently impose any income, corporate or capital gains taxes, estate duty, inheritance tax, gift tax or withholding tax on the Subsidiary. If Cayman Islands law changes such that the Subsidiary must pay Cayman Islands taxes, Fund shareholders would likely experience decreased investment returns.

Tracking Error Risk. The Fund may be subject to “tracking error,” which is the divergence of the Fund ’s performance from that of the Underlying Index. Tracking error may occur because of differences between the securities and other instruments held in the Fund ’s portfolio and those included in the Underlying Index, pricing differences, transaction costs incurred by the Fund, the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be heightened during times of increased market volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX ETFs THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN FUTURES CONTRACTS ISSUERS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

Valuation Risk. The price the Fund could receive upon the sale of a security or other asset may differ from the Fund's valuation of the security or other asset, particularly for securities or other assets that trade in low volume or volatile markets or that are valued using a fair value methodology as a result of trade suspensions or for other reasons. Because non-U.S. exchanges may be open on days when the Fund does not price its shares, the value of the securities or other assets in the Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund’s shares. Authorized Participants who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities or other instruments may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or other instruments or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

A Further Discussion of Other Risks

Table of Contents

agreements. The restrictions prevent the Fund from closing out a qualified financial contract during a specified time period if the counterparty is subject to resolution proceedings and also prohibit the Fund from exercising default rights due to a receivership or similar proceeding of an affiliate of the counterparty. These requirements may increase credit risk and other risks to the Fund.

Threshold/Underinvestment Risk. If certain aggregate and/or fund-level ownership thresholds are reached through transactions undertaken by BFA, its affiliates or the Fund, or as a result of third-party transactions or actions by an issuer or regulator, the ability of BFA and its affiliates on behalf of clients (including the Fund) to purchase or dispose of investments, or exercise rights or undertake business transactions, may be restricted by regulation or otherwise impaired. The capacity of the Fund to make investments in certain securities may be affected by the relevant threshold limits, and such limitations may have adverse effects on the liquidity and performance of the Fund’s portfolio holdings.

Table of Contents

invests in certain futures or other derivative transactions, there may be limits on the aggregate and/or fund-level amount invested or voted by BFA and its affiliates for their proprietary accounts and for client accounts (including the Fund) that may not be exceeded without the grant of a license or other regulatory or corporate consent or, if exceeded, may cause BFA and its affiliates, the Fund or other client accounts to suffer disadvantages or business restrictions.

Portfolio Holdings Information

Management

For its investment advisory services to the Fund, BFA is paid a management fee from the Fund based on a percentage of the Fund's average daily net assets, at the annual rate of 0.25%. BFA also serves as investment adviser to the Subsidiary. No fee will be paid to BFA for the advisory services that it provides to the Subsidiary. BFA has contractually agreed to waive a portion of its management fees in an amount equal to the Acquired Fund Fees and Expenses, if any, attributable to the Fund's investments in other ETPs sponsored by BFA or its affiliates and other funds advised by BFA or its affiliates through February 29, 2024, provided that the waiver be no greater than the Fund's management fee of 0.25%. The fee waiver information provided in the annual fund operating expenses table reflects the fees that will be waived consistent with the contractual waiver. It is not necessarily identical to the amount of fees that had been

Table of Contents

waived by BFA as shown in the financial highlights of the Fund's Annual Report. The contractual waiver may be terminated prior to February 29, 2024 only upon written agreement of the Trust and BFA. In addition, BFA may from time to time voluntarily waive and/or reimburse fees or expenses in order to limit total annual fund operating expenses (excluding Acquired Fund Fees and Expenses, if any). Any such voluntary waiver or reimbursement may be eliminated by BFA at any time.

A discussion regarding the basis for the approval by the Board of the Investment Advisory Agreement with BFA is available in the Fund's Annual Report for the period ended October 31.

Portfolio Managers. Richard Mejzak, Greg Savage, Paul Whitehead and Amy Whitelaw are primarily responsible for the day-to-day management of the Fund. Each Portfolio Manager is responsible for various functions related to portfolio management, including, but not limited to, developing and implementing the Fund’s investment process and investment strategy, researching and reviewing investment strategy and overseeing members of his portfolio management team that have more limited responsibilities.

Table of Contents

2009 to 2010. Mr. Whitehead was employed by BGI as Principal from 2002 to 2009. Mr. Whitehead has been a Portfolio Manager of the Fund since 2022.

Administrator, Custodian and Transfer Agent. State Street Bank and Trust Company (“State Street”) is the administrator, custodian and transfer agent for the Fund.

Table of Contents

having positions in certain securities that are senior or junior to, or have interests different from or adverse to, the securities that are owned by the Fund.

The Fund's activities may be limited because of regulatory restrictions applicable to BFA or one or more Affiliates and/or their internal policies designed to comply with such restrictions.

Shareholder Information

Table of Contents

for shares of the Fund purchased on an exchange or otherwise in the secondary market. The Fund's shares trade under the ticker symbol “IAUF.”

Buying or selling Fund shares on an exchange or other secondary market involves two types of costs that may apply to all securities transactions. When buying or selling shares of the Fund through a broker, you may incur a brokerage commission and other charges. The commission is frequently a fixed amount and may be a significant proportional cost for investors seeking to buy or sell small amounts of shares. In addition, you may incur the cost of the “spread,” that is, any difference between the bid price and the ask price. The spread varies over time for shares of the Fund based on the Fund’s trading volume and market liquidity, and is generally lower if the Fund has high trading volume and market liquidity, and higher if the Fund has little trading volume and market liquidity (which is often the case for funds that are newly launched or small in size). The Fund's spread may also be impacted by the liquidity of the underlying securities or other assets held by the Fund, particularly for newly launched or smaller funds or in instances of significant volatility of the underlying securities or other assets.

Table of Contents

registered investment company to invest in shares of the Fund beyond the limitations of Section 12(d)(1) in reliance on Rule 12d1-4 under the 1940 Act, the registered investment company must, among other things, enter into an agreement with the Trust. Foreign investment companies are permitted to invest in the Fund only up to the limits set forth in Section 12(d)(1), subject to any applicable SEC no-action relief.

The value of the securities and other assets and liabilities held by the Fund is determined pursuant to valuation policies and procedures approved by the Board.

Table of Contents

used with respect to debt obligations with sixty days or less remaining to maturity unless BFA determines in good faith that such method does not represent fair value.

Dividends and Distributions

Table of Contents

Taxes on Distributions. Distributions from the Fund’s net investment income (other than qualified dividend income), including distributions out of the Fund’s net short-term capital gains, if any, are taxable to you as ordinary income. Distributions by the Fund of net long-term capital gains, if any, in excess of net short-term capital losses (capital gain dividends) are taxable to you as long-term capital gains, regardless of how long you have held the Fund’s shares. Distributions by the Fund that qualify as qualified dividend income are taxable to you at long-term capital gain rates.However, given the Fund's investment objective and strategies, the Fund generally does not expect its distributions to be treated as qualified dividend income. Long-term capital gains and qualified dividend income are generally eligible for taxation at a maximum rate of 15% or 20% for non-corporate shareholders, depending on whether their income exceeds certain threshold amounts. Because the Fund may have a higher portfolio turnover than funds that seek to replicate the performance of an index, the Fund may, in comparison to such other funds, realize and distribute a higher amount of taxable realized capital gain. In addition, a 3.8% U.S. federal Medicare contribution tax is imposed on “net investment income,” including, but not limited to, interest, dividends, and net gain, of U.S. individuals with income exceeding $200,000 (or $250,000 if married and filing jointly) and of estates and trusts.

Table of Contents

which the distribution was received are sold. Once a shareholder's cost basis is reduced to zero, further distributions will be treated as capital gain, if the shareholder holds shares of the Fund as capital assets.

Table of Contents

A creation transaction, which is subject to acceptance by the Distributor and the Fund, generally takes place when an Authorized Participant deposits into the Fund a designated portfolio of securities, assets or other positions (a “creation basket”), and an amount of cash (including any cash representing the value of substituted securities, assets or other positions), if any, which together approximate the holdings of the Fund in exchange for a specified number of Creation Units. Similarly, shares can be redeemed only in Creation Units, generally for a designated portfolio of securities, assets or other positions (a “redemption basket”) held by the Fund and an amount of cash (including any portion of such securities for which cash may be substituted). The Fund generally offers Creation Units partially for cash, but may, in certain circumstances, offer Creation Units solely for cash or solely in-kind. Except when aggregated in Creation Units, shares are not redeemable by the Fund. Creation and redemption baskets may differ and the Fund may accept “custom baskets.” More information regarding custom baskets is contained in the Fund's SAI.

Table of Contents

documents, or if you are currently enrolled in householding and wish to change your householding status.

Distribution

Table of Contents

Financial Highlights

Financial Highlights
(For a share outstanding throughout each period)

	iShares Gold Strategy ETF
	Year Ended 10/31/21	Year Ended 10/31/20	Year Ended 10/31/19	Period From 06/06/18^(a) to 10/31/18
Net asset value, beginning of period	$62.75	$57.41	$46.76	$50.00
Net investment income (loss)^(b)	(0.07)	0.13	0.82	0.27
Net realized and unrealized gain (loss)^(c)	(3.67)	10.47	10.20	(3.51)
Net increase (decrease) from investment operations	(3.74)	10.60	11.02	(3.24)
Distributions^(d)
From net investment income	(4.47)	(5.26)	(0.37)	—
Total distributions	(4.47)	(5.26)	(0.37)	—
Net asset value, end of period	$54.54	$62.75	$57.41	$46.76
Total Return^(e)
Based on net asset value	(6.21)%	20.64%	23.74%	(6.48)%^(f)
Ratios to Average Net Assets
Total expenses	0.25%	0.25%	0.25%	0.25%^(g)
Total expenses after fees waived	0.13%	0.13%	0.18%	0.19%^(g)
Net investment income (loss)	(0.12)%	0.22%	1.58%	1.45%^(g)
Supplemental Data
Net assets, end of period (000)	$29,996	$21,964	$8,612	$4,676
Portfolio turnover rate^(h)	121%	77%	47%	13%^(f)
^(a) Commencement of operations.
^(b) Based on average shares outstanding.
^(c) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.
^(d) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.
^(e) Where applicable, assumes the reinvestment of distributions.
^(f) Not annualized.
^(g) Annualized.
^(h) Portfolio turnover rate excludes in-kind transactions.

Table of Contents

Disclaimers

Bloomberg and the Bloomberg Composite Gold Index are trademarks or service marks of Bloomberg Index Services Limited and its affiliates (collectively, “Bloomberg”). Bloomberg or Bloomberg's licensors own all proprietary right in the Bloomberg Composite Gold Index. Bloomberg does not guarantee the timeliness, accuracy or completeness of any data or information relating to the Bloomberg Composite Gold Index. Bloomberg makes no warranty, express or implied, as to the Bloomberg Composite Gold Index or any data or values relating thereto or results to be obtained therefrom, and expressly disclaims all warranties of merchantability and fitness for a particular purpose with respect thereto. Bloomberg reserves the right to change the methods of calculation or publication, or to cease the calculation or publication, of the Bloomberg Composite Gold Index, and Bloomberg shall not be liable for any miscalculation of or any incorrect, delayed or interrupted publication with respect to the Bloomberg Composite Gold Index. It is not possible to invest directly in an index. Back-tested performance is not actual performance. To the maximum extent allowed by law, Bloomberg, its licensors, and its and their respective employees, contractors, agents, suppliers and vendors shall have no liability or responsibility whatsoever for any injury or damages - whether direct, indirect, consequential, incidental, punitive or otherwise - arising in connection with the Bloomberg Composite Gold Index or any data or values relating thereto - whether arising from their negligence or otherwise. Nothing in Bloomberg Composite Gold Index shall constitute or be construed as an offering of financial instruments or as investment advice or investment recommendations (i.e., recommendations as to whether or not to “buy,” “sell,” “hold,” or to enter or not to enter into any other transaction involving any specific interest or interests) by Bloomberg or its affiliates or a recommendation as to an investment or other strategy by Bloomberg or its affiliates. Data and other information available via the Bloomberg Composite Gold Index should not be considered as information sufficient upon which to base an investment decision. All information provided by the Bloomberg Composite Gold Index is impersonal and not tailored to the needs of any person, entity or group of persons. Bloomberg and its affiliates do not express an opinion on the future or expected value of any security or other interest and do not explicitly or implicitly recommend or suggest an investment strategy of any kind.

Shares of the Fund are not sponsored, endorsed or promoted by Cboe BZX. Cboe BZX makes no representation or warranty, express or implied, to the owners of shares of the Fund or any member of the public regarding the ability of the Fund to track the total return performance of the Underlying Index or the ability of the Underlying Index to track market performance. Cboe BZX is not responsible for, nor has it participated in, the determination of the compilation or the calculation of the Underlying Index, nor in the determination of the timing of, prices of, or quantities of shares of the Fund to be issued, nor in the determination or calculation of the equation by which the shares are

Table of Contents

redeemable. Cboe BZX has no obligation or liability to owners of shares of the Fund in connection with the administration, marketing or trading of the shares of the Fund.

Cboe BZX does not guarantee the accuracy and/or the completeness of the Underlying Index or any data included therein. Cboe BZX makes no warranty, express or implied, as to results to be obtained by the Trust on behalf of the Fund as licensee, licensee’s customers and counterparties, owners of shares of the Fund, or any other person or entity from the use of the Underlying Index or any data included therein in connection with the rights licensed as described herein or for any other use.

Cboe BZX makes no express or implied warranties and hereby expressly disclaims all warranties of merchantability or fitness for a particular purpose with respect to the Underlying Index or any data included therein. Without limiting any of the foregoing, in no event shall Cboe BZX have any liability for any direct, indirect, special, punitive, consequential or any other damages (including lost profits) even if notified of the possibility of such damages.

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

Want to know more?

iShares.com | 1-800-474-2737

If you have any questions about the Trust or shares of the Fund or you wish to obtain the SAI, Semi-Annual or Annual Report free of charge, please:

Call:	1-800-iShares or 1-800-474-2737 (toll free) Monday through Friday, 8:30 a.m. to 6:30 p.m. (Eastern time)
Email:	iSharesETFs@blackrock.com
Write:	c/o BlackRock Investments, LLC 1 University Square Drive, Princeton, NJ 08540

Investment Company Act File No.: 811-22649

IS-P-IAUF-0322

	March 1, 2022

2022 Prospectus

iShares U.S. ETF Trust

•	iShares GSCI Commodity Dynamic Roll Strategy ETF \| COMT \| NASDAQ

Table of Contents

Fund Overview	S-1
More Information About the Fund	1
A Further Discussion of Principal Risks	2
A Further Discussion of Other Risks	20
Portfolio Holdings Information	22
Management	22
Shareholder Information	26
Distribution	34
Consolidated Financial Highlights	35
Disclaimers	36

The “S&P GSCI Dynamic Roll (USD) Total Return Index” is a product of S&P Dow Jones Indices LLC or its affiliates (“SPDJI”), and has been licensed for use by BlackRock Fund Advisors or its affiliates. Standard & Poor's^® and S&P^® are registered trademarks of Standard & Poor's Financial Services LLC (“S&P”); Dow Jones^® is a registered trademark of Dow Jones Trademark Holdings LLC (“Dow Jones”); iShares^® and BlackRock^® are registered trademarks of BlackRock Fund Advisors and its affiliates; and these trademarks have been licensed for use by SPDJI and sublicensed for certain purposes by iShares Trust. The Fund is not sponsored, endorsed, sold or promoted by SPDJI, Dow Jones, S&P or their respective affiliates, and none of such parties makes any representation regarding the advisability of investing in such product(s); nor do they have any liability for any errors, omissions, or interruptions of the S&P GSCI Dynamic Roll (USD) Total Return Index.

iShares^® and BlackRock^® are registered trademarks of BlackRock Fund Advisors and its affiliates.

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

iSHARES^® GSCI COMMODITY DYNAMIC ROLL STRATEGY ETF

Ticker: COMT

Stock Exchange: Nasdaq

Investment Objective

The iShares GSCI Commodity Dynamic Roll Strategy ETF (the “Fund”) seeks to track the investment results of an index composed of a broad range of commodity exposures with enhanced roll selection, on a total return basis.

Fees and Expenses

The following table describes the fees and expenses that you will incur if you buy, hold and sell shares of the Fund. The investment advisory agreement between iShares U.S. ETF Trust (the “Trust”) and BlackRock Fund Advisors (“BFA”) (the “Investment Advisory Agreement”) provides that BFA will pay all operating expenses of the Fund, except: (i) the management fees, (ii) interest expenses, (iii) taxes, (iv) expenses incurred with respect to the acquisition and disposition of portfolio securities, commodities or other financial instruments and the execution of portfolio transactions, including brokerage commissions, (v) distribution fees or expenses, and (vi) litigation expenses and any extraordinary expenses and are not included in the calculation of the ratio of expenses to average net assets shown in the Consolidated Financial Highlights section of this prospectus (the “Prospectus”). The Fund may incur “Acquired Fund Fees and Expenses.” Acquired Fund Fees and Expenses reflect the Fund's pro rata share of the fees and expenses incurred by investing in other investment companies. The impact of Acquired Fund Fees and Expenses is included in the total returns of the Fund. Acquired Fund Fees and Expenses are not included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Prospectus. BFA, the investment adviser to the Fund, has contractually agreed to waive a portion of its management fees in an amount equal to the Acquired Fund Fees and Expenses, if any, attributable to investments by the Fund in other registered investment companies advised by BFA, or its affiliates, through February 29, 2024. The contractual waiver may be terminated prior to February 29, 2024 only upon written agreement of the Trust and BFA.

You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Annual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investments)
Management Fees	Distribution and Service (12b-1) Fees	Other Expenses¹	Acquired Fund Fees and Expenses¹	Total Annual Fund Operating Expenses	Fee Waiver¹	Total Annual Fund Operating Expenses After Fee Waiver
0.48%	None	0.00%	0.00%	0.48%	(0.00)%	0.48%

¹	The amount rounded to 0.00%.

S-1

Table of Contents

1 Year		3 Years		5 Years		10 Years
$49		$154		$269		$604

Portfolio Turnover. The Fund may pay transaction costs, such as commissions, when it, directly or through a subsidiary, buys and sells securities or other assets (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 0% of the average value of its portfolio.

Principal Investment Strategies

The Fund seeks to track the investment results of the S&P GSCI Dynamic Roll (USD) Total Return Index (the “Underlying Index”), which measures the performance of futures contracts such as aluminum, Brent crude oil, cocoa, coffee, copper, corn, cotton, gas oil, feeder cattle, gold, heating oil, lean hogs, lead, live cattle, natural gas, nickel, silver, soybeans, sugar, unleaded gasoline, wheat, West Texas Intermediate crude oil and zinc. The Underlying Index is rebalanced on an annual basis.

In seeking to achieve its investment

objective, the Fund may invest in a combination of exchange-traded commodity futures contracts, exchange-traded options on commodity-related futures contracts and exchange-cleared commodity related swaps (together, “Commodity-Linked Investments”), thereby obtaining exposure to the commodities markets. Commodity-Linked Investments may also include exchange-cleared swaps on commodities and exchange-traded options on futures that provide exposure to the investment returns of the commodities markets, without investing directly in physical commodities. Investing in Commodity-Linked Investments may have a leveraging effect on the Fund.

The Fund also seeks to generate interest income and capital appreciation on the cash balances arising from its investment in Commodity-Linked Investments through a cash management strategy consisting primarily of investments in short-term, investment-grade fixed-income securities that include U.S. government and agency securities, treasury inflation-protected securities, sovereign debt obligations of non-U.S. countries, and repurchase agreements, money market instruments and cash and other

S-2

Table of Contents

cash equivalents (collectively, “Fixed-Income Investments”). The Fund uses Fixed-Income Investments as investments and to provide sufficient assets to account for (or “cover”) mark-to-market changes and to collateralize the Subsidiary's (as defined below) Commodity-Linked Investments exposure on a day-to-day basis. As of October 31, 2021, the Underlying Index was comprised of 24 components.

variability, duration, maturity, credit ratings and yield) and liquidity measures similar to those of an applicable underlying index. The Fund may or may not hold all of the securities and/or other instruments in the Underlying Index.

The Fund will seek to gain exposure to Commodity-Linked Investments by investing through a wholly-owned subsidiary organized in the Cayman Islands (the “Subsidiary”). The Subsidiary is advised by BFA and has the same investment objective as the Fund. Unlike the Fund, the Subsidiary is not an investment company registered under the Investment Company Act of 1940, as amended (the “1940 Act”). The Subsidiary will invest solely in Commodity-Linked Investments and cash.

In compliance with Subchapter M of the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”), the Fund may invest up to 25% of its total assets in the Subsidiary. The Fund’s Commodity-Linked Investments held in the Subsidiary are intended to provide the Fund with exposure to commodity markets within the limits of current U.S. federal income tax laws applicable to investment companies such as the Fund, which limit the ability of investment companies to invest directly in Commodity-Linked Investments.

The remainder of the Fund’s assets will be invested directly by the Fund, primarily in Fixed-Income Investments.

The Fund or the Subsidiary may from time to time invest in other exchange-traded funds (“ETFs”), exchange-traded notes or commodity-linked notes.

The Commodity Futures Trading Commission (“CFTC”) has adopted

S-3

Table of Contents

certain requirements that subject registered investment companies and their advisers to regulation by the CFTC if a registered investment company invests more than a prescribed level of its net asset value (“NAV”) in CFTC-regulated futures, options and swaps, or if a registered investment company markets itself as providing investment exposure to such instruments. Due to the Fund's potential use of CFTC-regulated futures, options and swaps above the prescribed levels, it is considered a “commodity pool” under the Commodity Exchange Act (“CEA”).

The Underlying Index is sponsored by S&P Dow Jones Indices LLC (the “Index Provider”), which is independent of the Fund and BFA. The Index Provider determines the composition and relative weightings of the securities in the Underlying Index and publishes information regarding the market value of the Underlying Index.

Industry Concentration Policy. The Fund will concentrate its investments (i.e., hold 25% or more of its total assets) in (i) equity securities issued by commodity-related companies, derivatives with exposure to commodity-related companies or investments in securities and derivatives linked to the underlying price movement of commodities, including but not limited to commodity-linked derivatives such as commodity-linked notes, commodity futures, forward contracts and swaps and other similar derivative instruments and investment vehicles that invest in commodities, or commodity-linked derivatives, and (ii) the industry or group of industries that constitutes the energy sector. For purposes of this limitation, securities of the U.S. government (including its agencies and

instrumentalities), repurchase agreements collateralized by U.S. government securities, and securities of state or municipal governments and their political subdivisions are not considered to be issued by members of any industry.

Summary of Principal Risks

Authorized Participant Concentration Risk. Only an Authorized Participant (as defined in the Creations and Redemptions section of this prospectus (the “Prospectus”)) may engage in creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other

S-4

Table of Contents

Authorized Participant is able to step forward to create or redeem, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting. Authorized Participant concentration risk may be heightened for ETFs, such as the Fund, that invest in securities issued by non-U.S. issuers or other securities or instruments that have lower trading volumes.

Commodity-Linked Derivatives Risk. The value of a commodity-linked derivative instrument typically is based upon the price movements of the underlying commodity or an economic variable linked to such price movements. The prices of commodity-linked investments may fluctuate quickly and dramatically as a result of changes affecting a particular commodity and may not correlate to price movements in other asset classes, such as stocks, bonds and cash. Commodity-linked derivatives are subject to the risk that the counterparty to the transaction, the exchange or trading facility on which they trade or the applicable clearing house may default or otherwise fail to perform. The Fund’s use of commodity-linked derivatives may also have a leveraging effect on the Fund’s portfolio because of the leverage inherent in the use of derivatives. Leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets

than the Fund would otherwise have had. The Fund is required to post margin with respect to its holdings in derivatives. Each of these factors and events could have a significant negative impact on the Fund.

Commodity Risk. The Fund invests in instruments that are susceptible to fluctuations in certain commodity markets and to price changes due to trade relations, including the imposition of tariffs by the U.S. and other importing countries. Any negative changes in commodity markets that may be due to changes in supply and demand for commodities, market events, regulatory developments, other catastrophic events, or other factors that the Fund cannot control could have an adverse impact on Commodity-Linked Investments in which the Fund invests.

S-5

Table of Contents

industries, sector, market segment or asset class.

Cybersecurity Risk. Failures or breaches of the electronic systems of the Fund, the Fund's adviser, distributor, the Index Provider and other service

providers, market makers, Authorized Participants or the issuers of securities in which the Fund invests have the ability to cause disruptions, negatively impact the Fund’s business operations and/or potentially result in financial losses to the Fund and its shareholders. While the Fund has established business continuity plans and risk management systems seeking to address system breaches or failures, there are inherent limitations in such plans and systems. Furthermore, the Fund cannot control the cybersecurity plans and systems of the Fund’s Index Provider and other service providers, market makers, Authorized Participants or issuers of securities in which the Fund invests.

S-6

Table of Contents

time of periodic reallocations of Fund assets, which losses are potentially unlimited. Certain derivatives may give rise to a form of leverage and may expose the Fund to greater risk and increase its costs. The impact of U.S. and global regulation of derivatives may make derivatives more costly, may limit the availability of derivatives, may delay or restrict the exercise by the Fund of termination rights or remedies upon a counterparty default under derivatives held by the Fund (which could result in losses), or may otherwise adversely affect the value or performance of derivatives.

certain date for settlement in cash based on the level of the reference rate. The primary risks associated with the use of futures contracts, or swaps or other derivatives referencing futures contracts, are: (i) the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; (ii) possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; (iii) losses caused by unanticipated market movements, which are potentially unlimited; (iv) BFA’s inability to predict correctly the direction of prices and other economic factors; and (v) the possibility that the counterparty will default in the performance of its obligations. To the extent that the Fund is exposed to rolling futures contracts, it may be subject to additional risk. In addition, CFTC regulations limit the types of foreign listed futures contracts that U.S. investors, like the Fund, are allowed to invest in. As a result, the Fund may not be able to gain the exposure it seeks through certain non-U.S. futures contracts.

S-7

Table of Contents

disruptions, lower consumer demand, layoffs, ratings downgrades, defaults and other significant economic impacts. Certain markets have experienced temporary closures, extreme volatility, severe losses, reduced liquidity and increased trading costs. These events will have an impact on the Fund and its investments and could impact the Fund’s ability to purchase or sell securities or cause elevated tracking error and increased premiums or discounts to the Fund's NAV. Other infectious illness outbreaks in the future may result in similar impacts.

S-8

Table of Contents

interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. The historically low interest rate environment heightens the risks associated with rising interest rates.

Management Risk. As the Fund may not fully replicate the Underlying Index, it is subject to the risk that the investment strategy of BFA and BlackRock International Limited (“BIL”), the Fund's sub-adviser, may not produce the intended results.

Market Trading Risk. The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, periods of high volatility and disruptions in the creation/redemption process. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

Metals and Mining Industry Risk. The Fund will have exposure to various metals. Investments in metals may be speculative and subject to greater price volatility than investments in other types of assets. The price of metals is related to, among other things, worldwide metal prices and extraction and production costs. Worldwide metal prices may fluctuate substantially over short periods of time, and as a result, the Fund’s share price may be more volatile than other types of investments.

National Closed Market Trading Risk. To the extent that the underlying

S-9

Table of Contents

securities and/or other assets held by the Fund trade on foreign exchanges or in foreign markets that may be closed when the securities exchange on which the Fund’s shares trade is open, there are likely to be deviations between the current price of such an underlying security and the last quoted price for the underlying security (i.e., the Fund’s quote from the closed foreign market). The impact of a closed foreign market on the Fund is likely to be greater where a large portion of the Fund’s underlying securities and/or other assets trade on that closed foreign market or when the foreign market is closed for unscheduled reasons. These deviations could result in premiums or discounts to the Fund’s NAV that may be greater than those experienced by other ETFs.

through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

Passive Investment Risk. The Fund is not actively managed, and BFA generally does not attempt to take defensive positions under any market conditions, including declining markets.

Reliance on Trading Partners Risk. The Fund invests in countries or regions whose economies are heavily dependent upon trading with key partners. Any reduction in this trading may have an adverse impact on the Fund's investments. Through its holdings of securities of certain issuers, the Fund is specifically exposed to North American Economic Risk.

S-10

Table of Contents

than some less developed countries. Certain developed countries have experienced security concerns, such as terrorism and strained international relations. Incidents involving a country’s or region’s security may cause uncertainty in its markets and may adversely affect its economy and the Fund’s investments. In addition, developed countries may be adversely impacted by changes to the economic conditions of certain key trading partners, regulatory burdens, debt burdens and the price or availability of certain commodities.

subject to such requirements as early as September 2022. These requirements may raise the costs for the Fund’s investment in swaps.

Structural Risk. The countries in which the Fund invests may be subject to considerable degrees of economic, political and social instability.

S-11

Table of Contents

legislation, limiting the circumstances in which the Fund’s income with respect to the Subsidiary will be considered “qualifying income,” the Fund might be required to make changes to its operations, which could reduce the Fund’s ability to gain investment exposure to commodities. Fund shareholders could also experience adverse tax consequences in such circumstances.

Tracking Error Risk. The Fund may be subject to “tracking error,” which is the divergence of the Fund’s performance from that of the Underlying Index. Tracking error may occur because of differences between the securities and other instruments held in the Fund’s portfolio and those included in the Underlying Index, pricing differences (including, as applicable, differences between a security’s price at the local market close and the Fund's valuation of a security at the time of calculation of the Fund's NAV), transaction costs incurred by the Fund, the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be

heightened during times of increased market volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX ETFs THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN FUTURES CONTRACTS ISSUERS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

S-12

Table of Contents

Performance Information

The bar chart and table that follow show how the Fund has performed on a calendar year basis and provide some indication of the risks of investing in the Fund by showing how the Fund’s average annual returns for 1 and 5 years and since inception compare with those of a broad measure of market performance. Prior to March 1, 2021, the Fund operated as a transparent active ETF. Both assume that all dividends and distributions have been reinvested in the Fund. Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. If BFA had not waived certain Fund fees during certain periods, the Fund's returns would have been lower.

Year by Year Returns (Years Ended December 31)

The best calendar quarter return during the periods shown above was 15.14% in the 2nd quarter of 2021; the worst was -31.52% in the 1st quarter of 2020.

Updated performance information, including the Fund’s current NAV, may be obtained by visiting our website at www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).

S-13

Table of Contents

Average Annual Total Returns

(for the periods ended December 31, 2021)

	One Year	Five Years	Since Fund Inception
(Inception Date: 10/15/2014)
Return Before Taxes	36.54%	5.14%	-1.45%
Return After Taxes on Distributions¹	27.92%	2.30%	-3.39%
Return After Taxes on Distributions and Sale of Fund Shares¹	21.50%	2.75%	-1.87%
S&P GSCI Dynamic Roll (USD) Total Return Index² (Index returns do not reflect deductions for fees, expenses, or taxes)	37.01%	4.01%	-3.19%

Prior to March 1, 2021, the Fund operated as a transparent active ETF. Index returns from inception through October 30, 2018 reflect the S&P GSCI™ Commodity Total Return Index. Index returns beginning on October 31, 2018 through January 30, 2020 reflect the S&P GSCI Dynamic Roll Reduced Energy 70/30 Futures/Equity Blend Total Return Index. Index returns from January 31, 2020 reflect the S&P GSCI Dynamic Roll (USD) Total Return Index.

S-14

Table of Contents

Management

Investment Adviser and Sub-Adviser. The Fund's investment adviser is BFA. The Fund's investment sub-adviser is BIL.

Portfolio Managers. Richard Mejzak, Tim Parsons, Greg Savage, Paul Whitehead and Amy Whitelaw (the “Portfolio Managers”) are primarily responsible for the day-to-day management of the Fund. Each Portfolio Manager supervises a portfolio management team. Mr. Mejzak, Mr. Parsons, Mr. Savage, Mr. Whitehead and Ms. Whitelaw have been Portfolio Managers of the Fund since 2016, 2019, 2014, 2022 and 2018, respectively.

Purchase and Sale of Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

S-15

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

More Information About the Fund

BFA is the investment adviser to the Fund, and BIL is the sub-adviser to the Fund. Shares of the Fund are listed for trading on The Nasdaq Stock Market LLC (“Nasdaq”). The market price for a share of the Fund may be different from the Fund’s most recent NAV.

Table of Contents

of the securities in its underlying index in approximately the same proportions as in the underlying index.

An investment in the Fund is not a bank deposit and it is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, BFA or any of its affiliates.

The Fund's investment objective and the Underlying Index may be changed without shareholder approval.

A Further Discussion of Principal Risks

The Fund is subject to various risks, including the principal risks noted below (either directly or through its investments in the Subsidiary), any of which may adversely affect the Fund’s NAV, trading price, yield, total return and ability to meet its investment objective. You could lose all or part of your investment in the Fund, and the Fund could underperform other investments. The order of the below risk factors does not indicate the significance of any particular risk factor.

Authorized Participant Concentration Risk. Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem Creation Units, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting. Authorized Participant concentration risk may be heightened because ETFs, such as the Fund, that invest in securities issued by non-U.S. issuers or other securities or instruments that are less widely traded often involve greater settlement and operational issues and capital costs for Authorized Participants, which may limit the availability of Authorized Participants.

Table of Contents

the Fund may underperform other funds that do not similarly invest in cash and cash equivalents for investment purposes and/or to collateralize derivative instruments.

Commodity-Linked Derivatives Risk. The value of a commodity-linked derivative instrument typically is based upon the price movements of the underlying commodity or an economic variable linked to such price movements. Therefore, the value of commodity-linked derivative instruments may be affected by changes in overall economic conditions, interest rates, or factors affecting a particular commodity or industry, such as production, disease, climate conditions, supply or demand, politics, geopolitics, changes in international balance of payments and trade, currency devaluations and revaluations, market liquidity, and economic, political and regulatory developments. The prices of commodity-related investments may fluctuate quickly and dramatically as a result of changes affecting a particular commodity and may or may not correlate to price movements in other asset classes, such as stocks, bonds and cash. Investments in commodity-linked derivatives may be subject to greater volatility than non-derivative based investments because of the leverage inherent in the use of derivatives. A highly liquid secondary market may not exist for certain commodity-linked derivatives, and there can be no assurance that one will develop. Commodity-linked derivatives also may be subject to credit and interest rate risks that in general affect the values of fixed-income securities. Therefore, at maturity, the Fund may receive more or less principal than it originally invested. The Fund might receive interest payments that are more or less than the stated coupon interest payments. Commodity derivatives are subject to the risk that the counterparty to the transaction, the exchange or trading facility on which they trade or the applicable clearing house may default or otherwise fail to perform. In addition, each exchange or trading facility on which derivatives are traded has the right to suspend or limit trading in all futures or other instruments that it lists. The Fund’s use of commodity-linked derivatives can result in large amounts of financial leverage. Although the Fund will not borrow money in order to increase the amount of its trading, the low margin deposits normally required in futures trading permit a high degree of leverage on the investment itself. Accordingly, a relatively small price movement in a futures contract may result in immediate and substantial losses to the Fund. Like other leveraged investments, any trade may result in losses in excess of the amount invested. Each of these factors and events could have a significant negative impact on the Fund.

Table of Contents

swaps that are “economically equivalent” to such contracts. As a result of these position limits, the size or duration of positions available to the Fund may be severely limited.

Commodity Risk. The Fund’s portfolio may be adversely affected by changes or trends in commodity prices. Commodity prices may be influenced or characterized by unpredictable factors, including, where applicable, high volatility, changes in supply and demand relationships, weather, agriculture, trade, pestilence, political instability, catastrophic events, changes in interest rates and monetary and other governmental policies, action and inaction, including price changes due to trade relations. Assets held by the Fund that are dependent on a single commodity, or are concentrated in a single commodity sector, may typically exhibit even higher volatility attributable to commodity prices.

The commodity markets are subject to temporary distortions and other disruptions due to, among other factors, lack of liquidity, the participation of speculators, and government regulation and other actions. U.S. futures exchanges and some foreign exchanges limit the amount of fluctuation in futures contract prices that may occur in a single business day (generally referred to as “daily price fluctuation limits”). The maximum or minimum price of a contract as a result of these limits is referred to as a “limit price.” If the limit price has been reached in a particular contract, no trades may be made beyond the limit price. Limit prices have the effect of precluding trading in a particular contract or forcing the liquidation of contracts at disadvantageous times or prices.

Counterparty Risk. Certain commodity-linked derivative instruments, uncleared swaps and other forms of financial instruments that involve counterparties subject the Fund to the risk that the counterparty could default on its obligations under the agreement, either through the counterparty’s bankruptcy or failure to perform its obligations. In the event of a counterparty default, the Fund could experience lengthy delays in recovering some or all of its assets or obtain no recovery at all and, if the counterparty is subject to specified types of resolution proceedings, the Fund may be subject to stays that limit its ability to close out positions and limit risk. The Fund may deposit funds required to margin open positions in the derivative instruments subject to the CEA with a clearing broker registered as an FCM, which is an entity that solicits or accepts orders to buy or sell commodity futures, options, swaps or forward contracts and accepts money or other assets from customers to support such orders. The FCM could default on an obligation set forth in an agreement between the Fund

Table of Contents

and the FCM, including the FCM’s obligation to return margin posted in connection with the Fund’s futures contracts. If a counterparty defaults on its payment obligations, the Fund may lose money and the value of an investment in Fund shares may decrease. In addition, the Fund may engage in such investment transactions with a limited number of counterparties, which may increase the Fund’s exposure to counterparty credit risk.

Table of Contents

incomplete. Substantial costs may be incurred by the Fund in order to resolve or prevent cyber incidents in the future. While the Fund has established business continuity plans in the event of, and risk management systems to prevent, such cyber incidents, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, that prevention and remediation efforts will not be successful or that cyberattacks will go undetected. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund, issuers in which the Fund invests, the Index Provider, market makers or Authorized Participants. The Fund and its shareholders could be negatively impacted as a result.

Table of Contents

well as the oil futures markets, which resulted in the market price of the front month WTI crude oil futures contract falling below zero for a period of time.

Table of Contents

value or subject to greater or more frequent volatility. In the longer term, there is likely to be a period of significant political, regulatory and commercial uncertainty as the U.K. continues to negotiate the terms of its future trading relationships.

Futures Contract Risk. Futures are standardized, exchange-traded contracts that obligate a purchaser to take delivery, and a seller to make delivery, of a specific amount of an asset at a specified future date at a specified price. Unlike equities, which typically entitle the holder to a continuing ownership stake in an issuer, futures contracts normally specify a certain date for settlement in cash based on the level of the reference rate. The primary risks associated with the use of futures contracts, or swaps or other derivatives referencing futures contracts, are: (i) the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; (ii) possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; (iii) losses caused by unanticipated market movements, which are potentially unlimited; (iv) BFA's inability to predict correctly the direction of prices and other economic factors; and (v) the possibility that the counterparty will default in the performance of its obligations. When a futures contract is rolled forward—which may be done in order to retain the allocation to a specific position beyond the maturity of the futures contract—the Fund may lose money if the two contracts are trading at different prices as compared to fair value. For example, if the futures contract which the Fund has exposure to is trading at a discount to fair value and the contract being rolled into is trading at a premium to fair value, the Fund will lose money. The actual realization of a potential roll cost will be dependent upon the difference in price of the near and distant contracts. The relevant futures contracts may not be “rolled” on a predefined schedule as they approach expiration; instead BFA may determine to gain exposure to another futures contract. In addition, CFTC regulations limit the types of foreign listed futures contracts that U.S. investors, like the Fund, are allowed to invest in. As a result, the Fund may not be able to gain the exposure it seeks through certain non-U.S. futures contracts.

Table of Contents

adversely impact the economies of these geographic areas or assets exposed to these geographic areas, causing an adverse impact on the value of the Fund.

Table of Contents

used as benchmarks by funds or managers. Such errors may negatively or positively impact the Fund and its shareholders. For example, during a period where the Underlying Index contains incorrect constituents, the Fund would have market exposure to such constituents and would be underexposed to the Underlying Index’s other constituents. Shareholders should understand that any gains from Index Provider errors will be kept by the Fund and its shareholders and any losses or costs resulting from Index Provider errors will be borne by the Fund and its shareholders.

■

Table of Contents

	that have negative yields, the Fund’s value may be impaired as a result. Certain issuers of equity securities have cancelled or announced the suspension of dividends. The outbreak has, and may continue to, negatively affect the credit ratings of some fixed-income securities and their issuers.
■	Market Closures. Certain local markets have been or may be subject to closures, and there can be no assurance that trading will continue in any local markets in which the Fund may invest, when any resumption of trading will occur or, once such markets resume trading, whether they will face further closures. Any suspension of trading in markets in which the Fund invests will have an impact on the Fund and its investments and will impact the Fund’s ability to purchase or sell securities in such markets.
■	Operational Risk. The outbreak could also impair the information technology and other operational systems upon which the Fund’s service providers, including BFA, rely, and could otherwise disrupt the ability of employees of the Fund's service providers to perform critical tasks relating to the Fund, for example, due to the service providers’ employees performing tasks in alternate locations than under normal operating conditions or the illness of certain employees of the Fund's service providers.
■	Governmental Interventions. Governmental and quasi-governmental authorities and regulators throughout the world have responded to the outbreak and the resulting economic disruptions with a variety of fiscal and monetary policy changes, including direct capital infusions into companies and other issuers, new monetary policy tools, and lower interest rates. An unexpected or sudden reversal of these policies, or the ineffectiveness of such policies, is likely to increase market volatility, which could adversely affect the Fund’s investments.
■	Pre-Existing Conditions. Public health crises caused by the outbreak may exacerbate other pre-existing political, social and economic risks in certain countries or globally, which could adversely affect the Fund and its investments and could result in increased premiums or discounts to the Fund's NAV.

Other infectious illness outbreaks that may arise in the future could have similar or other unforeseen effects.

Table of Contents

income dealer market-making capacity may lead to lower trading volume, heightened volatility, wider bid-ask spreads and less transparent pricing in certain fixed-income markets.

Management Risk. Because BFA and BIL use a representative sampling indexing strategy, the Fund may not fully replicate the Underlying Index and may hold securities not included in the Underlying Index. As a result, the Fund is subject to the risk that the investment strategy of BFA and BIL, the implementation of which is subject to a number of constraints, may not produce the intended results.

Table of Contents

financial instruments in the face of market movements or uncertainty. The value of a security or other asset may decline due to changes in general market conditions, economic trends or events that are not specifically related to the issuer of the security or other asset, or factors that affect a particular issuer or issuers, country, group of countries, region, market, industry, group of industries, sector or asset class. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund and its investments and could result in increased premiums or discounts to the Fund’s NAV. During a general market or commodity market downturn, multiple asset classes may be negatively affected. Changes in market conditions and interest rates generally do not have the same impact on all types of securities and instruments.

Market Trading Risk.

Table of Contents

products based on the Fund may lead to increased trading volume and volatility in the secondary market for the shares of the Fund.

Shares of the Fund May Trade at Prices Other Than NAV. Shares of the Fund trade on stock exchanges at prices at, above or below the Fund’s most recent NAV. The NAV of the Fund is calculated at the end of each business day and fluctuates with changes in the market value of the Fund’s holdings. The trading price of the Fund's shares fluctuates continuously throughout trading hours based on both market supply of and demand for Fund shares and the underlying value of the Fund's portfolio holdings or NAV. As a result, the trading prices of the Fund’s shares may deviate significantly from NAV during periods of market volatility, including during periods of significant redemption requests or other unusual market conditions. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV. However, because shares can be created and redeemed in Creation Units at NAV, BFA believes that large discounts or premiums to the NAV of the Fund are not likely to be sustained over the long term (unlike shares of many closed-end funds, which frequently trade at appreciable discounts from, and sometimes at premiums to, their NAVs). While the creation/redemption feature is designed to make it more likely that the Fund’s shares normally will trade on stock exchanges at prices close to the Fund’s next calculated NAV, exchange prices are not expected to correlate exactly with the NAV due to timing reasons, supply and demand imbalances and other factors. In addition, disruptions to creations and redemptions, including disruptions at market makers, Authorized Participants, or other market participants, and during periods of significant market volatility, may result in trading prices for shares of the Fund that differ significantly from its NAV. Authorized Participants may be less willing to create or redeem Fund shares if there is a lack of an active market for such shares or its underlying investments, which may contribute to the Fund’s shares trading at a premium or discount to NAV.

Table of Contents

things, worldwide metal prices and extraction and production costs. Worldwide metal prices may fluctuate substantially over short periods of time, and as a result, the Fund’s share price may be more volatile than other types of investments. In addition, metals may be significantly affected by changes in global demand for certain metals, economic developments, energy conservation, the success of exploration projects, changes in exchange rates, interest rates, economic conditions, tax treatment, trade treaties, and government regulation and intervention, and events in the regions which the Fund has exposure (e.g., expropriation, nationalization, confiscation of assets and property of mining companies, the imposition of restrictions on foreign investments or repatriation of capital, military coups, social or political unrest, violence and labor unrest). Metals may also be subject to the effects of competitive pressures in the metals and mining industry.

Money Market Instruments Risk. The value of money market instruments may be affected by changing interest rates and by changes in the credit ratings of the investments. If a significant amount of the Fund's assets are invested in money market instruments, it will be more difficult for the Fund to achieve its investment objective. An investment in a money market fund is not insured or guaranteed by the FDIC or any other government agency. It is possible to lose money by investing in a money market fund. Money market funds other than government money market funds or retail money market funds “float” their NAV instead of using a stable $1.00 per share price.

National Closed Market Trading Risk. To the extent that the underlying securities and/or other assets held by the Fund trade on foreign exchanges or in foreign markets that may be closed when the securities exchange on which the Fund’s shares trade is open, there are likely to be deviations between the current price of an underlying security and the last quoted price for the underlying security (i.e., the Fund’s quote from the closed foreign market). The impact of a closed foreign market on the Fund is likely to be greater where a large portion of the Fund’s underlying securities and/or other assets trade on that closed foreign market or when the foreign market is closed for unscheduled reasons. These deviations could result in premiums or discounts to the Fund’s NAV that may be greater than those experienced by other ETFs.

Table of Contents

value of these securities may fluctuate due to changes in the exchange rate of the issuer’s local currency against the U.S. dollar.

The U.S. is Canada's and Mexico's largest trading and investment partner. The Canadian and Mexican economies are significantly affected by developments in the U.S. economy. Since the implementation of the North American Free Trade Agreement (“NAFTA”) in 1994 among Canada, the U.S. and Mexico, total merchandise trade among the three countries has increased. However, political developments including the implementation of tariffs by the U.S. and the renegotiation of NAFTA in the form of the United States-Mexico-Canada Agreement (“USMCA”), which replaced NAFTA on July 1, 2020, could negatively affect North America’s economic outlook and, as a result, the value of securities, including Commodity-Linked Investments, held by the Fund. Policy and legislative changes in one country may have a significant effect on North American markets generally, as well as on the value of certain securities held by the Fund.

Operational Risk. The Fund is exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund's service providers, counterparties or other third parties, failed or inadequate processes and technology or systems failures. The Fund and BFA seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

Reliance on Trading Partners Risk. The economies of many countries or regions in which the Fund invests are highly dependent on trade with certain key trading partners. Reduction in spending on products and services by these key trading partners, institution of tariffs or other trade barriers or a slowdown in the economies of key trading partners may adversely affect the performance of any security in which the Fund invests and have a material adverse effect on the Fund’s performance.

Table of Contents

and raising of certain crops/livestock versus other uses of resources; (ii) the location and size of crop and livestock production; (iii) whether unprocessed or processed commodity products are traded; and (iv) the volume and types of imports and exports. Economic recession or labor difficulties may also lead to a decrease in demand for the products and services involved in agriculture. As a result, the price of agricultural or livestock commodities could decline, which would affect the performance of the Fund.

Table of Contents

Risk of Swap Agreements. Swaps can involve greater risks than direct investment in securities or physical commodities because swaps may be leveraged and are subject to counterparty risk (e.g., the risk of a counterparty defaulting on the obligation or bankruptcy), credit risk and pricing risk (i.e., swaps may be difficult to value). Swaps may be subject to illiquidity risk, and it may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses. Certain standardized interest rate and credit default swaps are required to be traded on an exchange or trading platform and centrally cleared. Most other swaps are entered into on a negotiated, bi-lateral basis and traded in the over-the-counter market. Swaps are subject to bi-lateral variation margin. Initial margin requirements are in the process of being phased in, and the Fund may be subject to such requirements as early as September 2022. These requirements may raise the costs for the Fund’s investment in swaps. Central clearing is expected to reduce counterparty credit risk and increase liquidity, but central clearing does not make swap transactions risk-free. Swaps entered into by the Fund through its Subsidiary may not be centrally cleared which would expose the Fund to counter-party default risk and illiquidity risk, as liquidity depends on the willingness of counterparties to enter into, and the ability of counterparties to hedge the risks of, such contracts. All swaps require posting of collateral, which may restrict the ability of the Fund to invest the assets in different ways and which involve costs to the Fund. Swaps provide customized contractual terms, which may not, in all cases, provide the hedging or other intended benefits.

Large Government Debt Risk. Chronic structural public sector deficits in some countries in which the Fund may invest may adversely impact securities held by the Fund.

Table of Contents

indirectly exposed to the risks associated with the Subsidiary’s investments. The Commodity-Linked Investments that may be held by the Subsidiary are generally similar to those that are permitted to be held by the Fund and are subject to the same risks that apply to similar investments if held directly by the Fund. There can be no assurance that the investment objective of the Subsidiary will be achieved. The Subsidiary is not registered under the 1940 Act, and, unless otherwise noted in the Prospectus, is not subject to the investor protections of the 1940 Act. The Trust’s Board of Trustees (the “Board”) has oversight responsibility for the investment activities of the Fund, including its investment in the Subsidiary, and the Fund’s role as sole shareholder of the Subsidiary. The Subsidiary will be subject to the same investment restrictions and limitations, and will follow the same compliance policies and procedures, as the Fund. The Subsidiary’s financial statements are consolidated with the Fund’s financial statements that are included in the Fund’s Annual and Semi-Annual Reports to shareholders.

Tracking Error Risk. The Fund may be subject to “tracking error,” which is the divergence of the Fund’s performance from that of the Underlying Index. Tracking error may occur because of differences between the securities and other instruments held in the Fund’s portfolio and those included in the Underlying Index, pricing differences (including, as applicable, differences between a security’s price at the local market close and the Fund's valuation of a security at the time of calculation of the Fund's NAV), transaction costs incurred by the Fund, the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be heightened during times of increased market volatility or other unusual market

Table of Contents

conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX ETFs THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN FUTURES CONTRACTS ISSUERS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

Valuation Risk. The price the Fund could receive upon the sale of a security or other asset may differ from the Fund's valuation of the security or other asset, particularly for securities or other assets that trade in low volume or volatile markets or that are valued using a fair value methodology as a result of trade suspensions or for other reasons. Because non-U.S. exchanges may be open on days when the Fund does not price its shares, the value of the securities or other assets in the Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund’s shares. In addition, for purposes of calculating the Fund's NAV, the value of assets denominated in non-U.S. currencies is translated into U.S. dollars at the prevailing market rates. Authorized Participants who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

A Further Discussion of Other Risks

Affiliated Fund Risk. In managing the Fund, BFA will have the ability to invest in certain ETFs consistent with the model output which it believes will achieve the Fund’s objective. BFA may be subject to potential conflicts of interest in selecting certain ETFs because the fees paid to BFA by some ETFs managed by BFA may be higher than the fees paid by other ETFs. If a mutual fund or ETF holds interests in an affiliated fund in excess of a certain amount, the Fund may be prohibited from purchasing shares of that ETF.

Table of Contents

of war. Escalated tensions involving the two countries and any outbreak of hostilities between the two countries, or even the threat of an outbreak of hostilities, could have a severe adverse effect on the entire Asian region. Certain Asian countries have developed increasingly strained relationships with the U.S. or with China, and if these relations were to worsen, they could adversely affect Asian issuers that rely on the U.S. or China for trade. In addition, many Asian countries are subject to social and labor risks associated with demands for improved political, economic and social conditions. These risks, among others, may adversely affect the value of the Fund's investments.

Table of Contents

Additionally, increased environmental or labor costs may depress the value of mining and metal investments.

Portfolio Holdings Information

Management

BFA is responsible, under the investment advisory agreement, for substantially all expenses of the Fund, including the cost of transfer agency, custody, fund administration, legal, audit and other services. BFA is not responsible for, and the Fund will bear, the management fees, interest expenses, taxes, expenses incurred with respect to the acquisition and disposition of portfolio securities, commodities or other financial instruments and the execution of portfolio transactions, including brokerage

Table of Contents

commissions, distribution fees or expenses, and litigation expenses and any extraordinary expenses (as determined by a majority of the Trustees who are not “interested persons” of the Trust). For the avoidance of doubt, extraordinary expenses do not include expenses related to the organization of any subsidiary for the Fund or the ongoing corporate expenses of maintaining such subsidiary.

For its investment advisory services to the Fund, BFA is paid a management fee from the Fund based on a percentage of the Fund's average daily net assets, at the annual rate of 0.48%. BFA also serves as investment adviser to the Subsidiary. No fee will be paid to BFA for the advisory services that it provides to the Subsidiary. BFA has contractually agreed to waive a portion of its management fees in an amount equal to the Acquired Fund Fees and Expenses, if any, attributable to investments by the Fund in other registered investment companies advised by BFA, or its affiliates, through February 29, 2024. The contractual waiver may be terminated prior to February 29, 2024 only upon written agreement of the Trust and BFA. In addition, BFA may from time to time voluntarily waive and/or reimburse fees or expenses in order to limit total annual fund operating expenses (excluding Acquired Fund Fees and Expenses, if any). Any such voluntary waiver or reimbursement may be eliminated by BFA at any time.

BFA has entered into a sub-advisory agreement with BIL (the “Sub-Adviser”), an affiliate of BFA, under which BFA pays the Sub-Adviser for services it provides a fee equal to 60% of the management fee paid to BFA under the Investment Advisory Agreement. The Sub-Adviser, subject to the supervision and oversight of the Board and BFA, is responsible for day-to-day management of specified assets in the Fund’s portfolio. BIL also serves as Sub-Adviser to the Subsidiary.

BFA is located at 400 Howard Street, San Francisco, CA 94105. It is an indirect wholly-owned subsidiary of BlackRock, Inc. (“BlackRock”). As of December 31, 2021, BFA and its affiliates provided investment advisory services for assets in excess of $10.01 trillion. BFA, the Sub-Adviser, and their affiliates trade and invest for their own accounts in the actual securities and types of securities in which the Fund may also invest, which may affect the price of such securities. BFA is considered a “commodity pool operator” with respect to the Fund under the CEA and is therefore subject to regulation by the SEC and the CFTC with respect to the Fund.

BIL is an investment adviser located in the U.K. at Exchange Place One, 1 Semple Street, Edinburgh EH3 8BL, Scotland 011 44 131 472 7200. The Sub-Adviser is a registered investment adviser and a commodity pool operator organized in 1999.

A discussion regarding the basis for the approval by the Board of the Investment Advisory Agreement with BFA and the Sub-Advisory Agreement between BFA and the Sub-Adviser is available in the Fund's Annual Report for the period ended October 31.

Table of Contents

disclaims any responsibility to update such views. These views may not be relied on as investment advice and may not be relied on as an indication of trading intent on behalf of the Fund.

Portfolio Managers. Richard Mejzak, Tim Parsons, Greg Savage, Paul Whitehead and Amy Whitelaw are primarily responsible for the day-to-day management of the Fund. Each Portfolio Manager is responsible for various functions related to portfolio management, including, but not limited to, developing and implementing the Fund’s investment process and investment strategy, researching and reviewing investment strategy and overseeing members of his portfolio management team that have more limited responsibilities.

Tim Parsons has been with BlackRock since 2007, including his time with Barclays Global Investors (“BGI”), which merged with BlackRock in 2009. Mr. Parsons has been employed by BFA or its affiliates as a portfolio manager since 2016 and has been a Portfolio Manager of the Fund since 2019.

Paul Whitehead has been with BlackRock since 1996, including his years with BGI, which merged with BlackRock in 2009. Mr. Whitehead has been employed by BlackRock as a Managing Director since 2010 and a Director from 2009 to 2010. Mr. Whitehead was employed by BGI as Principal from 2002 to 2009. Mr. Whitehead has been a Portfolio Manager of the Fund since 2022.

Administrator, Custodian and Transfer Agent. State Street Bank and Trust Company (“State Street”) is the administrator, custodian and transfer agent for the Fund.

Table of Contents

follow investment programs similar to that of the Fund. BFA and its Affiliates are involved worldwide with a broad spectrum of financial services and asset management activities and may engage in the ordinary course of business in activities in which their interests or the interests of their clients may conflict with those of the Fund. BFA or one or more Affiliates act, or may act, as an investor, research provider, investment manager, commodity pool operator, commodity trading advisor, financier, underwriter, adviser, trader, lender, index provider, agent and/or principal, and have other direct and indirect interests in securities, currencies, commodities, derivatives and other instruments in which the Fund may directly or indirectly invest. The Fund may invest in securities of, or engage in other transactions with, companies with which an Affiliate has significant debt or equity investments or other interests. The Fund may also invest in issuances (such as structured notes) by entities for which an Affiliate provides and is compensated for cash management services relating to the proceeds from the sale of such issuances. The Fund also may invest in securities of, or engage in other transactions with, companies for which an Affiliate provides or may in the future provide research coverage. An Affiliate may have business relationships with, and purchase or distribute or sell services or products from or to, distributors, consultants or others who recommend the Fund or who engage in transactions with or for the Fund, and may receive compensation for such services. BFA or one or more Affiliates may engage in proprietary trading and advise accounts and funds that have investment objectives similar to those of the Fund and/or that engage in and compete for transactions in the same types of securities, currencies and other instruments as the Fund. This may include transactions in securities issued by other open-end and closed-end investment companies (which may include investment companies that are affiliated with the Fund and BFA, to the extent permitted under the 1940 Act). The trading activities of BFA and these Affiliates are carried out without reference to positions held directly or indirectly by the Fund and may result in BFA or an Affiliate having positions in certain securities that are senior or junior to, or have interests different from or adverse to, the securities that are owned by the Fund.

Table of Contents

The Fund's activities may be limited because of regulatory restrictions applicable to BFA or one or more Affiliates and/or their internal policies designed to comply with such restrictions.

Shareholder Information

Buying or selling Fund shares on an exchange or other secondary market involves two types of costs that may apply to all securities transactions. When buying or selling shares of the Fund through a broker, you may incur a brokerage commission and other charges. The commission is frequently a fixed amount and may be a significant proportional cost for investors seeking to buy or sell small amounts of shares. In addition, you may incur the cost of the “spread,” that is, any difference between the bid price and the ask price. The spread varies over time for shares of the Fund based on the Fund’s trading volume and market liquidity, and is generally lower if the Fund has high trading volume and market liquidity, and higher if the Fund has little trading volume and market liquidity (which is often the case for funds that are newly launched or small in size). The Fund's spread may also be impacted by the liquidity of the underlying securities or other assets held by the Fund, particularly for newly launched or smaller funds or in instances of significant volatility of the underlying securities or other assets.

The Board has adopted a policy of not monitoring for frequent purchases and redemptions of Fund shares (“frequent trading”) that appear to attempt to take

Table of Contents

advantage of a potential arbitrage opportunity presented by a lag between a change in the value of the Fund’s portfolio securities and other assets after the close of the primary markets for the Fund’s portfolio securities or assets and the reflection of that change in the Fund’s NAV (“market timing”), because the Fund sells and redeems its shares directly through transactions that are in-kind and/or for cash, subject to the conditions described below under Creations and Redemptions. The Board has not adopted a policy of monitoring for other frequent trading activity because shares of the Fund are listed for trading on a national securities exchange.

Table of Contents

The value of the securities and other assets and liabilities held by the Fund is determined pursuant to valuation policies and procedures approved by the Board.

Table of Contents

Dividends and Distributions

Table of Contents

gain dividends) are taxable to you as long-term capital gains, regardless of how long you have held the Fund’s shares. Distributions by the Fund that qualify as qualified dividend income are taxable to you at long-term capital gain rates. Long-term capital gains and qualified dividend income are generally eligible for taxation at a maximum rate of 15% or 20% for non-corporate shareholders, depending on whether their income exceeds certain threshold amounts. Because the Fund may have a higher portfolio turnover than funds that seek to replicate the performance of an index, the Fund may, in comparison to such other funds, realize and distribute a higher amount of taxable realized capital gain. In addition, a 3.8% U.S. federal Medicare contribution tax is imposed on “net investment income,” including, but not limited to, interest, dividends, and net gain, of U.S. individuals with income exceeding $200,000 (or $250,000 if married and filing jointly) and of estates and trusts.

Dividends will be qualified dividend income to you if they are attributable to qualified dividend income received by the Fund. Generally, qualified dividend income includes dividend income from taxable U.S. corporations and qualified non-U.S. corporations, provided that the Fund satisfies certain holding period requirements in respect of the stock of such corporations and has not hedged its position in the stock in certain ways. For this purpose, a qualified non-U.S. corporation means any non-U.S. corporation that is eligible for benefits under a comprehensive income tax treaty with the U.S., which includes an exchange of information program, or if the stock with respect to which the dividend was paid is readily tradable on an established U.S. securities market. The term excludes a corporation that is a passive foreign investment company.

Dividends received by the Fund from a RIC generally are qualified dividend income only to the extent such dividend distributions are made out of qualified dividend income received by such RIC. Additionally, it is expected that dividends received by the Fund from a real estate investment trust and distributed to a shareholder generally will be taxable to the shareholder as ordinary income. However, for tax years beginning after December 31, 2017 and before January 1, 2026, the Fund may report dividends eligible for a 20% “qualified business income” deduction for non-corporate U.S. shareholders to the extent the Fund’s income is derived from ordinary REIT dividends, reduced by allocable Fund expenses.

For a dividend to be treated as qualified dividend income, the dividend must be received with respect to a share of stock held without being hedged by the Fund, and with respect to a share of the Fund held without being hedged by you, for 61 days during the 121-day period beginning at the date which is 60 days before the date on which such share becomes ex-dividend with respect to such dividend or, in the case of certain preferred stock, 91 days during the 181-day period beginning 90 days before such date.

Table of Contents

taxable to shareholders and will not constitute nontaxable returns of capital. A return of capital distribution generally will not be taxable but will reduce the shareholder’s cost basis and result in a higher capital gain or lower capital loss when those shares on which the distribution was received are sold. Once a shareholder's cost basis is reduced to zero, further distributions will be treated as capital gain, if the shareholder holds shares of the Fund as capital assets.

Table of Contents

name, address, and taxpayer identification number of each substantial U.S. owner or provide certifications of no substantial U.S. ownership unless certain exceptions apply.

Table of Contents

aggregated in Creation Units, shares are not redeemable by the Fund. Creation and redemption baskets may differ and the Fund may accept “custom baskets.” More information regarding custom baskets is contained in the Fund's SAI.

To the extent the Fund engages in in-kind transactions, the Fund intends to comply with the U.S. federal securities laws in accepting securities for deposit and satisfying redemptions with redemption securities by, among other means, assuring that any securities accepted for deposit and any securities used to satisfy redemption requests will be sold in transactions that would be exempt from registration under the Securities Act of 1933, as amended (the “1933 Act”). Further, an Authorized Participant that is not a “qualified institutional buyer,” as such term is defined in Rule 144A under the 1933 Act, will not be able to receive restricted securities eligible for resale under Rule 144A.

Table of Contents

Distribution

Table of Contents

Consolidated Financial Highlights

The consolidated financial highlights table is intended to help investors understand the Fund’s financial performance for the past five years. Certain information reflects financial results for a single share of the Fund. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in the Fund, assuming reinvestment of all dividends and distributions. This information has been audited by PricewaterhouseCoopers LLP, whose report is included, along with the Fund's financial statements, in the Fund's Annual Report (available upon request).

Financial Highlights
(For a share outstanding throughout each period)

	iShares GSCI Commodity Dynamic Roll Strategy ETF
	Year Ended 10/31/21	Year Ended 10/31/20	Year Ended 10/31/19	Year Ended 10/31/18	Year Ended 10/31/17
Net asset value, beginning of year	$24.27	$31.80	$37.18	$35.97	$32.41
Net investment income (loss)^(a)	(0.13)	0.26	0.76	0.63	0.31
Net realized and unrealized gain (loss)^(b)	13.37	(6.93)	(3.04)	2.62	3.58
Net increase (decrease) from investment operations	13.24	(6.67)	(2.28)	3.25	3.89
Distributions^(c)
From net investment income	(0.10)	(0.86)	(3.10)	(2.04)	(0.33)
Total distributions	(0.10)	(0.86)	(3.10)	(2.04)	(0.33)
Net asset value, end of year	$37.41	$24.27	$31.80	$37.18	$35.97
Total Return^(d)
Based on net asset value	54.75%	(21.66)%	(5.87)%	9.29%^(e)	12.08%
Ratios to Average Net Assets
Total expenses	0.48%	0.48%	0.48%	0.48%	0.48%
Total expenses after fees waived	0.48%	0.48%	0.48%	0.48%	0.48%
Net investment income (loss)	(0.38)%	0.95%	2.32%	1.66%	0.93%
Supplemental Data
Net assets, end of year (000)	$2,824,785	$196,558	$518,373	$728,739	$258,956
Portfolio turnover rate^(f)	0%	5%	32%	167%	44%
^(a) Based on average shares outstanding.
^(b) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.
^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.
^(d) Where applicable, assumes the reinvestment of distributions.
^(e) Includes payment received from an affiliate, which impacted the Fund’s total return. Excluding the payment from an affiliate, the Fund’s total return would have been 9.06%.
^(f) Portfolio turnover rate excludes in-kind transactions.

Table of Contents

Disclaimers

The Underlying Index is a product of SPDJI, and has been licensed for use by BFA or its affiliates. Standard & Poor’s^® and S&P^® are registered trademarks of Standard & Poor’s Financial Services LLC, a division of S&P Global (“S&P”); Dow Jones^® is a registered trademark of Dow Jones Trademark Holdings LLC (“Dow Jones”); iShares^® and BlackRock^® are registered trademarks of BFA and its affiliates; and these trademarks have been licensed for use by SPDJI and sublicensed for certain purposes by the Trust. The Fund is not sponsored, endorsed, sold or promoted by SPDJI, Dow Jones, S&P, or any of their respective affiliates (collectively, “S&P Dow Jones Indices”). S&P Dow Jones Indices make no representation or warranty, express or implied, to the owners of shares of the Fund or any member of the public regarding the advisability of investing in securities generally or in the Fund in particular or the ability of the Underlying Index to track general market performance. S&P Dow Jones Indices’ only relationship to the Trust and BFA and their affiliates with respect to the Underlying Index is the licensing of the Underlying Index and certain trademarks, service marks and/or trade names of S&P Dow Jones Indices and/or its third party licensors. The Underlying Index is determined, composed and calculated by S&P Dow Jones Indices without regard to the Trust, BFA or its affiliates or the Fund. S&P Dow Jones Indices have no obligation to take the needs of BFA or its affiliates or the owners of shares of the Fund into consideration in determining, composing or calculating the Underlying Index. S&P Dow Jones Indices are not responsible for and have not participated in the determination of the prices, and amount of shares of the Fund or the timing of the issuance or sale of such shares or in the determination or calculation of the equation by which shares of the Fund are to be converted into cash, surrendered or redeemed, as the case may be. S&P Dow Jones Indices have no obligation or liability in connection with the administration, marketing or trading of shares of the Fund. There is no assurance that investment products based on the Underlying Index will accurately track index performance or provide positive investment returns. SPDJI is not an investment adviser. Inclusion of a security within an index is not a recommendation by S&P Dow Jones Indices to buy, sell, or hold such security, nor is it considered to be investment advice.

S&P DOW JONES INDICES DO NOT GUARANTEE THE ADEQUACY, ACCURACY, TIMELINESS AND/OR THE COMPLETENESS OF THE UNDERLYING INDEX OR ANY DATA RELATED THERETO OR ANY COMMUNICATION, INCLUDING BUT NOT LIMITED TO, ORAL OR WRITTEN COMMUNICATION (INCLUDING ELECTRONIC COMMUNICATIONS) WITH RESPECT THERETO. S&P DOW JONES INDICES SHALL NOT BE SUBJECT TO ANY DAMAGES OR LIABILITY FOR ANY ERRORS, OMISSIONS, OR DELAYS THEREIN. S&P DOW JONES INDICES MAKE NO EXPRESS OR IMPLIED WARRANTIES, AND EXPRESSLY DISCLAIM ALL WARRANTIES, OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE OR AS TO RESULTS TO BE OBTAINED BY BFA OR ITS AFFILIATES, OWNERS OF SHARES OF THE FUND, OR ANY OTHER PERSON OR ENTITY FROM THE USE OF THE UNDERLYING INDEX OR WITH RESPECT TO ANY DATA RELATED THERETO. WITHOUT LIMITING ANY OF THE FOREGOING, IN NO EVENT WHATSOEVER SHALL S&P DOW JONES INDICES BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES INCLUDING, BUT NOT LIMITED TO, LOSS OF PROFITS, TRADING

Table of Contents

LOSSES, LOST TIME OR GOODWILL, EVEN IF THEY HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, WHETHER IN CONTRACT, TORT, STRICT LIABILITY, OR OTHERWISE. THERE ARE NO THIRD PARTY BENEFICIARIES OF ANY AGREEMENTS OR ARRANGEMENTS BETWEEN S&P DOW JONES INDICES AND BFA OR ITS AFFILIATES, OTHER THAN THE LICENSORS OF S&P DOW JONES INDICES.

Shares of the Fund are not sponsored, endorsed or promoted by Nasdaq. Nasdaq makes no representation or warranty, express or implied, to the owners of shares of the Fund or any member of the public regarding the ability of the Fund to track the total return performance of the Underlying Index or the ability of the Underlying Index to track market performance. Nasdaq is not responsible for, nor has it participated in, the determination of the compilation or the calculation of the Underlying Index, nor in the determination of the timing of, prices of, or quantities of shares of the Fund to be issued, nor in the determination or calculation of the equation by which the shares are redeemable. Nasdaq has no obligation or liability to owners of shares of the Fund in connection with the administration, marketing or trading of shares of the Fund.

Nasdaq does not guarantee the accuracy and/or the completeness of the Underlying Index or any data included therein. Nasdaq makes no warranty, express or implied, as to results to be obtained by the Trust on behalf of the Fund as licensee, licensee’s customers and counterparties, owners of shares of the Fund, or any other person or entity from the use of the Underlying Index or any data included therein in connection with the rights licensed as described herein or for any other use. Nasdaq makes no express or implied warranties and hereby expressly disclaims all warranties of merchantability or fitness for a particular purpose with respect to the Underlying Index or any data included therein. Without limiting any of the foregoing, in no event shall Nasdaq have any liability for any direct, indirect, special, punitive, consequential or any other damages (including lost profits) even if notified of the possibility of such damages.

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

Want to know more?

iShares.com | 1-800-474-2737

If you have any questions about the Trust or shares of the Fund or you wish to obtain the SAI, Semi-Annual or Annual Report free of charge, please:

Call:	1-800-iShares or 1-800-474-2737 (toll free) Monday through Friday, 8:30 a.m. to 6:30 p.m. (Eastern time)
Email:	iSharesETFs@blackrock.com
Write:	c/o BlackRock Investments, LLC 1 University Square Drive, Princeton, NJ 08540

Investment Company Act File No.: 811-22649

IS-P-COMT-0322

	March 1, 2022

2022 Prospectus

iShares U.S. ETF Trust

•	iShares Inflation Hedged Corporate Bond ETF \| LQDI \| CBOE BZX

Table of Contents

Fund Overview	S-1
More Information About the Fund	1
A Further Discussion of Principal Risks	2
A Further Discussion of Other Risks	19
Portfolio Holdings Information	24
A Further Discussion of Principal Investment Strategies	24
Management	25
Shareholder Information	28
Distribution	36
Financial Highlights	37
Index Provider	38
Disclaimers	39

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

iSHARES^® INFLATION HEDGED CORPORATE BOND ETF

Ticker: LQDI

Stock Exchange: Cboe BZX

Investment Objective

The iShares Inflation Hedged Corporate Bond ETF (the “Fund”) seeks to track the investment results of an index designed to mitigate the inflation risk of a portfolio composed of U.S. dollar-denominated, investment grade corporate bonds.

Fees and Expenses

The following table describes the fees and expenses that you will incur if you buy, hold and sell shares of the Fund. The investment advisory agreement between iShares U.S. ETF Trust (the “Trust”) and BlackRock Fund Advisors (“BFA”) (the “Investment Advisory Agreement”) provides that BFA will pay all operating expenses of the Fund, except: (i) the management fees, (ii) interest expenses, (iii) taxes, (iv) expenses incurred with respect to the acquisition and disposition of portfolio securities and the execution of portfolio transactions, including brokerage commissions, (v) distribution fees or expenses, and (vi) litigation expenses and extraordinary expenses. The Fund may incur “Acquired Fund Fees and Expenses.” Acquired Fund Fees and Expenses reflect the Fund's pro rata share of the fees and expenses incurred by investing in other investment companies. The impact of Acquired Fund Fees and Expenses is included in the total returns of the Fund. BFA, the investment adviser to the Fund, has contractually agreed to waive a portion of its management fees so that the Fund’s total annual fund operating expenses after the fee waiver are equal to the Acquired Fund Fees and Expenses attributable to the Fund’s investment in the iShares iBoxx $ Investment Grade Corporate Bond ETF (“LQD” or the “Underlying Fund”), after taking into account any fee waivers by LQD, plus 0.05% through February 28, 2023. The contractual waiver may be terminated prior to February 28, 2023 only upon written agreement of the Trust and BFA.

You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Annual Fund Operating Expenses
(ongoing expenses that you pay each year as a
percentage of the value of your investments)

Management
Fees

Distribution
and
Service (12b-1)
Fees

Other
Expenses

Acquired Fund
Fees
and Expenses

Total Annual
Fund
Operating
Expenses

Fee Waiver

Total Annual
Fund
Operating
Expenses
After
Fee Waiver

0.20%

None

0.13%

0.33%

(0.15)%

0.18%

S-1

Table of Contents

1 Year		3 Years		5 Years		10 Years
$18		$91		$170		$403

Portfolio Turnover. The Fund or the Underlying Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate for the Fund or the Underlying Fund may indicate higher transaction costs and may cause the Fund or the Underlying Fund to incur increased expenses. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example (except costs to the Underlying Fund included as part of Acquired Fund Fees and Expenses), affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 0% of the average value of its portfolio. To the extent the Underlying Fund incurs costs from high portfolio turnover, such costs may have a negative effect on the performance of the Fund.

Principal Investment Strategies

The Fund seeks to track the investment results of the BlackRock Inflation Hedged Corporate Bond Index (the “Underlying Index”), which is designed to minimize the inflation risk of a portfolio composed of U.S. dollar-denominated, investment-grade corporate bonds, represented in the

Underlying Index by the Underlying Fund, by including a series of up to 10 inflation swap contracts with different maturities (as determined by BlackRock Index Services, LLC (the “Index Provider”)). As of October 31, 2021, the Underlying Index includes approximately 12 components, and the Underlying Fund includes approximately 2,455 components. The Fund invests in U.S. dollar-denominated, investment-grade corporate bonds primarily through its investment in the Underlying Fund. To be included in the Underlying Fund, bonds must have: (i) at least three years to maturity; and (ii) at least three years and 6 months to maturity for new index insertions. The Fund seeks to track the inflation hedging component of the Underlying Index primarily through the use of positions in inflation swaps (i.e., contracts in which the Fund makes fixed-rate payments based on a notional reference amount while receiving floating-rate payments on the same notional reference amount determined from an inflation index). The different maturities and weights of the swap contracts included in the Underlying Index are intended to hedge the portfolio’s inflation risk at key points on the yield curve, as determined by the Index Provider. The Underlying Index includes a fixed number of shares (to be adjusted in the event of any stock splits) of the Underlying Fund, and the Index Provider rebalances the weights of the inflation swap contracts included in the Underlying Index daily. On a monthly basis, the Index Provider will add new inflation swap contracts to the Underlying Index and remove the previous month’s inflation swap

S-2

Table of Contents

contracts. Finally, the Index Provider includes a 5% cash position in the Underlying Index in order to represent the collateral that is required to be kept available for the margin requirements for the inflation swap contracts.

The Fund seeks to achieve its investment objective by investing, under normal circumstances, at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in component securities and instruments in the Fund’s Underlying Index. The Fund seeks to track the investment results of the Underlying Index before fees and expenses of the Fund.

The Fund may also invest in other instruments designed to transfer inflation risk from one party to another, including but not limited to U.S. Treasury Inflation Protected Securities (“TIPS”), total return swaps, credit default swaps, interest rate swaps and U.S. Treasury futures (collectively with inflation swaps, “inflation hedging instruments”). The Fund’s investments in inflation hedging instruments are not intended to mitigate credit risk or other factors influencing the price of investment-grade corporate bonds, which may have a greater impact than inflation rates. Moreover, to the extent that inflation risk has been priced into the investment-grade corporate bonds owned by the Fund or the Underlying Fund, the Fund will underperform the Underlying Fund even during inflationary periods.

A registered investment company and its adviser are subject to regulation by the CFTC if the registered investment company invests more than a prescribed level of its net asset value in CFTC-regulated futures, options and swaps, or if the registered investment company markets itself as providing investment exposure to such instruments. Due to the Fund’s potential use of CFTC-regulated futures, options

and swaps above the prescribed levels, it is considered a “commodity pool” and BFA is considered a “commodity pool operator” with respect to the Fund under the Commodity Exchange Act (“CEA”).

Indexing may eliminate the chance that the Fund will substantially outperform the Underlying Index but also may reduce some of the risks of active management, such as poor security selection. Indexing seeks to achieve lower costs and better after-tax performance by aiming to keep portfolio turnover low in comparison to actively managed investment companies.

BFA uses a representative sampling indexing strategy to manage the Fund and the Underlying Fund. “Representative sampling” is an indexing strategy that involves investing in a representative sample of securities and/or other instruments that collectively have an investment profile similar to that of an applicable underlying index. The securities and/or other instruments selected are expected to have, in the aggregate, investment characteristics (based on factors such as market value and industry weightings), fundamental characteristics (such as return variability, duration, maturity, credit ratings and yield) and liquidity measures similar to those of an applicable underlying index. The Fund or the Underlying Fund may or may not hold all

S-3

Table of Contents

of the securities and/or other instruments in the applicable Underlying Index.

The Fund may lend securities from its portfolio representing up to one-third of the value of the Fund's total assets (including the value of the collateral received).

The Underlying Index is sponsored by the Index Provider, an affiliated person of the Fund and of BFA, the Fund’s investment adviser. The Index Provider determines the composition and relative weightings of the securities in the Underlying Index and publishes information regarding the market value of the Underlying Index.

Industry Concentration Policy. The Fund will concentrate its investments (i.e., hold 25% or more of its total assets) in a particular industry or group of industries to approximately the same extent that an underlying fund is concentrated. For purposes of this limitation, securities of the U.S. government (including its agencies and instrumentalities) and repurchase agreements collateralized by U.S. government securities are not considered to be issued by members of any industry.

Summary of Principal Risks

not indicate the significance of any particular risk factor.

Asset Class Risk. Securities and other assets in the Fund's or the Underlying Fund's portfolio may underperform in comparison to the general financial markets, a particular financial market or other asset classes.

Assets Under Management (AUM) Risk. From time to time, an Authorized Participant (as defined in the Creations and Redemptions section of this prospectus (the “Prospectus”)), a third-party investor, the Fund’s adviser or an affiliate of the Fund’s adviser, or a fund may invest in the Fund and hold its investment for a specific period of time to allow the Fund to achieve size or scale. There can be no assurance that any such entity would not redeem its investment or that the size of the Fund would be maintained at such levels, which could negatively impact the Fund.

Calculation Methodology Risk. The Underlying Index relies on various

S-4

Table of Contents

sources of information to assess the criteria of issuers included in the Underlying Index , including information that may be based on assumptions and estimates. Neither the Fund nor BFA can offer assurances that the Underlying Index’s calculation methodology or sources of information will provide an accurate assessment of included issuers.

Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund or the Underlying Fund may “call” or repay the security before its stated maturity, and the Fund or the Underlying Fund may have to reinvest the proceeds in securities with lower yields, which would result in a decline in the Fund's or Underlying Fund's income, or in securities with greater risks or with other less favorable features.

Cash Management Risk. If a significant amount of the Fund’s assets are invested in cash and cash equivalents, it will be more difficult for the Fund to achieve its investment objective. The Fund may underperform other funds that do not similarly invest in cash and cash equivalents for investment purposes and/or to collateralize derivative instruments.

Commodity Regulatory Risk. The Fund is deemed a commodity pool and BFA is considered a “commodity pool operator” with respect to the Fund under the CEA. BFA is therefore subject to regulation by the SEC and the CFTC. BFA is also subject to regulation by the National Futures Association (“NFA”). The regulatory requirements governing the use of commodity futures, options on commodity futures, certain swaps or certain other investments could change at any time.

Consumer Staples Sector Risk. The consumer staples sector may be affected by, among other things, marketing campaigns, changes in consumer demands, government regulations and changes in commodity prices.

Credit Risk. Debt issuers and other counterparties may be unable or unwilling to make timely interest and/or principal payments when due or otherwise honor their obligations. Changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may also adversely affect the value of the Fund’s or Underlying Fund's investment in that issuer. The degree of credit risk depends on an issuer's or counterparty's financial condition and on the terms of an obligation.

S-5

Table of Contents

financial losses to the Fund and its shareholders. While the Fund has established business continuity plans and risk management systems seeking to address system breaches or failures, there are inherent limitations in such plans and systems. Furthermore, the Fund cannot control the cybersecurity plans and systems of the Fund’s Index Provider and other service providers, market makers, Authorized Participants, hedging counterparties to the Fund or issuers of securities in which the Fund or the Underlying Fund invests.

The Fund or Underlying Fund could also suffer losses related to its derivatives positions as a result of unanticipated market movements, or movements between the time of periodic reallocations of Fund or Underlying Fund assets, which losses are potentially unlimited. Certain derivatives may give rise to a form of leverage and may expose the Fund or Underlying Fund to greater risk and increase its costs. The impact of U.S. and global regulation of derivatives may make derivatives more costly, may limit the availability of derivatives, may delay or restrict the exercise by the Fund or Underlying Fund of termination rights or remedies upon a counterparty default under derivatives held by the Fund or Underlying Fund (which could result in losses), or may otherwise adversely affect the value or performance of derivatives.

Financials Sector Risk. Performance of companies in the financials sector may be adversely impacted by many factors, including, among others, changes in government regulations, economic conditions, and interest rates, credit rating downgrades, and decreased liquidity in credit markets. The extent to which the Fund or the Underlying Fund may invest in a company that engages in securities-related activities or banking is limited by applicable law. The impact of changes in capital requirements and recent or future regulation of any individual financial company, or of the financials sector as a whole, cannot be predicted. In recent years, cyberattacks and technology malfunctions and failures have become increasingly frequent in this sector and have caused significant losses to companies in this sector, which may negatively impact the Fund.

S-6

Table of Contents

Geographic Risk. A natural disaster could occur in a geographic region in which the Fund or the Underlying Fund invests, which could adversely affect the economy or the business operations of companies in the specific geographic region, causing an adverse impact on the Fund's or the Underlying Fund's investments in, or which are exposed to, the affected region.

Hedging Risk. The Fund seeks to mitigate the potential impact of inflation on the performance of investment-grade corporate bonds by investing in inflation hedging instruments. The Fund’s use of inflation hedging instruments is intended solely to mitigate inflation risk and is not intended to mitigate credit risk, interest rate risk, or other factors influencing the price of investment-grade corporate bonds, which may have a greater impact on the bonds’ returns than inflation. There is no guarantee that the Fund’s positions in inflation hedging instruments will completely eliminate the inflation risk of the long positions in investment-grade corporate bonds. In addition, when interest rates rise above the inflation rate, the Fund’s investments will generally underperform a portfolio composed solely of the investment-grade corporate bonds. In certain low inflation rate environments, the Fund’s hedging strategy could result in disproportionately larger losses in the positions in inflation hedging instruments as compared to gains in the long investment-grade corporate bond positions attributable to interest rate changes. The Fund only seeks to hedge the impact of inflation and, as a result, if floating interest rates rise above the inflation-linked rates, the Fund will not be hedged. There is no guarantee the Fund will have positive returns, even in environments of sharply rising inflation

rates in which the Fund’s positions in inflation hedging instruments might be expected to mitigate the effects of such rises. The Fund incurs expenses when entering into positions in inflation hedging instruments. Moreover, to the extent that inflation risk has been priced into the investment-grade corporate bonds owned by the Fund or the Underlying Fund, the Fund will underperform the Underlying Fund even during inflationary periods.

Income Risk. The Fund’s income may decline when interest rates fall because the Fund may hold a significant portion of short duration securities and/or securities that have floating or variable interest rates. The Fund’s income may decline because the Fund invests in lower yielding bonds, and as the bonds in its portfolio mature, are near maturity or are called, the Fund needs to purchase additional bonds.

S-7

Table of Contents

Index-Related Risk. There is no guarantee that the Fund’s investment results will have a high degree of correlation to those of the Underlying Index or that the Fund will achieve its investment objective. Market disruptions and regulatory restrictions could have an adverse effect on the Fund’s ability to adjust its exposure to the required levels in order to track the Underlying Index. Errors in index data, index computations or the construction of the Underlying Index in accordance with its methodology may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, which may have an adverse impact on the Fund and its shareholders. Because the Index Provider is relatively new to the creation of securities indexes, there may be a greater risk that index errors will not be detected as quickly as they might be in the case of an index maintained by a long-standing index provider. Unusual market conditions may cause the Index Provider to postpone a scheduled rebalance, which could cause the Underlying Index to vary from its normal or expected composition.

securities or cause elevated tracking error and increased premiums or discounts to the Fund's NAV. Other infectious illness outbreaks in the future may result in similar impacts.

Inflation-Linked Instruments Risk. There can be no assurance that the Consumer Price Index (“CPI”), which typically is referenced by inflation swaps, or any other inflation index will accurately measure the rate of inflation experienced in the U.S. or the rate of expected future inflation reflected in the prices and yields of bonds held by the Fund. CPI swaps may cause the Fund’s NAV and returns to be more volatile and expose the Fund to counterparty risk. The Fund could lose money on both the inflation hedging instruments and the investment-grade corporate bonds, and the present value of the Fund’s portfolio investments could decrease if inflation increases.

Inflation Risk. The Fund seeks to mitigate many of the adverse impacts of inflation on investment-grade corporate bonds held by the Fund or the Underlying Fund and their issuers primarily through the use of swaps linked to the CPI. The CPI is a measure that examines the weighted average of prices of a basket of consumer goods and services, and measures changes in the purchasing power of the U.S. dollar and the rate of inflation. CPI swaps will not mitigate inflation risk regarding distributions made by the Fund itself.

S-8

Table of Contents

Fund will benefit from a CPI swap if actual inflation (as measured by the CPI) during the time period in which the Fund holds the swap is the same or greater than the level of inflation expected for that period. However, if actual inflation (as measured by the CPI) is less than the rate of inflation expected for that period, the Fund generally will lose money on the CPI swap and underperform the Underlying Fund as a result of having entered into the CPI swap.

Interest Rate Risk. During periods of very low or negative interest rates, the Fund may be unable to maintain positive returns or pay dividends to Fund shareholders. Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, result in heightened market volatility and detract from the Fund’s performance to the extent the Fund is exposed to such interest rates. Additionally, under certain market conditions in which interest rates are low and the market prices for portfolio securities have increased, the Fund may have a very low or even negative yield. A low or negative yield would cause the Fund to lose money in certain conditions and over certain time periods. An increase in interest rates will generally cause the value of securities held by the Fund or the Underlying Fund to decline, may lead to heightened volatility in the fixed-income markets and may adversely affect the liquidity of certain fixed-income investments, including those held by the Fund or the Underlying Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden

and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. The historically low interest rate environment heightens the risks associated with rising interest rates.

In order to hedge the risk of interest rate increases due to inflation, the Fund will take positions in inflation hedging instruments. As a result, when the rate of inflation does not increase or when interest rates increase or decrease inversely to changes in the rate of inflation, the Fund will underperform the Underlying Fund. There is no guarantee that the Fund or Underlying Fund will have positive performance even in environments of sharply rising inflation. There is no guarantee that the Fund or Underlying Fund will be able to successfully mitigate inflation risk or that bond values and interest rates will match changes in inflation rates.

Interest Rate Swap Risk. Interest rate swaps are subject to risks applicable to swaps generally, including the risk that a counterparty fails to meet its obligations and the risk that the Fund is not able to liquidate such swap in a timely manner or at all, which could result in losses to the Fund. Because the Fund invests in swaps that are subject to central clearing, these swaps are subject to the risk that a central clearinghouse will go into bankruptcy or become non-operational, and sometimes involve increased transaction costs. Counterparties to OTC swaps are not subject to these risks. An interest rate swap may fail to perform as intended and may not offset adverse changes in interest rates fully or at all. An interest rate swap may also reduce the Fund’s gains due to

S-9

Table of Contents

favorable changes in interest rates and result in losses to the Fund. Counterparties to interest rate swaps are subject to manipulation in the marketplace of the reference benchmark rate, which may affect the utility of the swap as a hedge.

Investment in the Underlying Fund Risk. The Fund expects to invest a substantial portion of its assets in the Underlying Fund, so the Fund’s investment performance is likely to be directly related to the performance of the Underlying Fund, adjusted for the impact of changes in the rate of inflation. The Fund’s NAV will change with changes in the value of the Underlying Fund and other securities and instruments in which the Fund invests based on their market valuations. An investment in the Fund will entail more costs and expenses than a direct investment in the Underlying Fund.

As the Fund’s allocations to the Underlying Fund change from time to time, or to the extent that the expense ratio of the Underlying Fund changes, the weighted average operating expenses borne by the Fund may increase or decrease.

Through its investment in the Underlying Fund, the Fund is exposed to Management Risk, Market Risk, and Market Trading Risk, among other risks.

Changes in the financial condition or credit rating of an issuer of those securities or counterparty on other instruments may cause the value of the securities or instruments to decline.

Management Risk. As the Fund will not fully replicate the Underlying Index, it is subject to the risk that BFA's investment strategy may not produce the intended results. The Fund is also subject to the risk that the investment strategy of the Underlying Fund may not produce the intended results.

Market Risk. The Fund and the Underlying Fund could lose money over short periods due to short-term market movements and over longer periods during more prolonged market downturns. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund, the Underlying Fund and their investments and could result in increased premiums or discounts to the Fund’s or Underlying Fund's NAV.

Market Trading Risk. The Fund and the Underlying Fund face numerous market trading risks, including the potential lack of an active market for their shares, losses from trading in secondary markets, periods of high volatility and disruptions in the creation/redemption process. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

S-10

Table of Contents

possibility of expropriation or confiscatory taxation, adverse changes in investment or exchange control regulations, political instability, regulatory and economic differences, and potential restrictions on the flow of international capital.

Operational Risk. The Fund and the Underlying Fund are exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund’s or the Underlying Fund's service providers, counterparties or other third parties, failed or inadequate processes and technology or systems failures. The Fund, the Underlying Fund and BFA seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

Passive Investment Risk. The Fund and the Underlying Fund are not actively managed, and BFA generally does not attempt to take defensive positions under any market conditions, including declining markets.

risks associated with developed countries. Developed countries tend to represent a significant portion of the global economy and have generally experienced slower economic growth than some less developed countries. Certain developed countries have experienced security concerns, such as terrorism and strained international relations. Incidents involving a country’s or region’s security may cause uncertainty in its markets and may adversely affect its economy and the Fund’s or the Underlying Fund's investments. In addition, developed countries may be adversely impacted by changes to the economic conditions of certain key trading partners, regulatory burdens, debt burdens and the price or availability of certain commodities.

Securities Lending Risk. The Fund or the Underlying Fund may engage in securities lending. Securities lending

S-11

Table of Contents

involves the risk that the Fund or the Underlying Fund may lose money because the borrower of the loaned securities fails to return the securities in a timely manner or at all. The Fund or the Underlying Fund could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. These events could also trigger adverse tax consequences for the Fund or Underlying Fund.

Tax Risk. The Fund invests in derivatives. The federal income tax treatment of a derivative may not be as favorable as a direct investment in an underlying asset. Derivatives may produce taxable income and taxable realized gain. Derivatives may adversely affect the timing, character and amount of income the Fund realizes from its investments. As a result, a larger portion of the Fund’s distributions may be treated as ordinary income rather than as capital gains. In addition, certain derivatives are subject to mark-to-market or straddle provisions of the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”). If such provisions are applicable, there could be an increase (or decrease) in the amount of taxable dividends paid by the Fund. Income from swaps is generally taxable. In addition, the tax treatment of certain derivatives, such as swaps, is unsettled and may be subject to future legislation, regulation or administrative pronouncements issued by the U.S. Internal Revenue Service (“IRS”). Because the Fund invests in the Underlying Fund, the Fund’s realized losses on sales of shares of the Underlying Fund may be indefinitely or permanently deferred as “wash sales.” Distributions of short-term capital gains

by the Underlying Fund will be recognized as ordinary income by the Fund and would not be offset by the Fund’s capital loss carryforwards, if any. Capital loss carryforwards of the Underlying Fund, if any, would not offset net capital gains of the Fund. Each of these effects is caused by the Fund’s investment in the Underlying Fund and may result in distributions to Fund shareholders being of higher magnitude and less likely to qualify for lower capital gain tax rates than if the Fund were to invest directly in the securities and other instruments composing its portfolio.

Tracking Error Risk. The Fund may be subject to “tracking error,” which is the divergence of the Fund’s performance from that of the Underlying Index. Tracking error may occur because of differences between the securities and other instruments held in the Fund’s portfolio and those included in the Underlying Index, pricing differences (including, as applicable, differences between a security’s price at the local market close and the Fund's or an Underlying Fund's valuation of a security at the time of calculation of the Fund's or Underlying Fund's NAV, respectively), transaction costs incurred by the Fund, the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be heightened during times of increased

S-12

Table of Contents

market volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX EXCHANGE TRADED FUNDS (“ETFs”) THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN SWAP CONTRACTS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

In addition, the value of the securities or other instruments in the Fund's or the Underlying Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund's or the Underlying Fund's shares. Authorized Participants who purchase or redeem Fund shares on days when the Fund or the Underlying Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund or the Underlying Fund not fair-valued securities or used a different valuation methodology. The Fund’s or the Underlying Fund's ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

S-13

Table of Contents

Performance Information

The bar chart and table that follow show how the Fund has performed on a calendar year basis and provide some indication of the risks of investing in the Fund by showing how the Fund’s average annual returns for 1 year and since inception compare with those of a broad measure of market performance. Both assume that all dividends and distributions have been reinvested in the Fund. Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. If BFA had not waived certain Fund fees during certain periods, the Fund's returns would have been lower. Effective December 1, 2021, the Fund is no longer actively managed. The performance information below prior to December 1, 2021 is based on the performance of the Fund when it was actively managed by BFA using an investment strategy substantially similar to the methodology of the Underlying Index.

Year by Year Returns (Years Ended December 31)

The best calendar quarter return during the periods shown above was 13.58% in the 2nd quarter of 2020; the worst was -11.88% in the 1st quarter of 2020.

Updated performance information, including the Fund’s current NAV, may be obtained by visiting our website at www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).

S-14

Table of Contents

Average Annual Total Returns

(for the periods ended December 31, 2021)

	One Year	Since Fund Inception
(Inception Date: 5/8/2018)
Return Before Taxes	6.92%	8.69%
Return After Taxes on Distributions¹	5.84%	7.38%
Return After Taxes on Distributions and Sale of Fund Shares¹	4.07%	6.14%
Markit iBoxx^® USD Liquid Investment Grade Inflation Hedged Index^2,3 (Index returns do not reflect deductions for fees, expenses, or taxes)	10.09%	9.96%
BlackRock Inflation Hedged Corporate Bond Index³ (Index returns do not reflect deductions for fees, expenses, or taxes)	N/A	N/A

²	The Markit iBoxx^® USD Liquid Investment Grade Inflation Hedged Index is an unmanaged index that is designed to reflect the inflation hedged performance of U.S. dollar-denominated investment-grade corporate debt.
³	Effective December 1, 2021, the fund is no longer actively managed and the Fund's new Underlying Index is the BlackRock Inflation Hedged Corporate Bond Index. The inception date of the BlackRock Inflation Hedged Corporate Bond Index is October 29, 2021.

S-15

Table of Contents

Management

Investment Adviser. BlackRock Fund Advisors.

Portfolio Managers. James Mauro and Karen Uyehara (the “Portfolio Managers”) are primarily responsible for the day-to-day management of the Fund. Each Portfolio Manager supervises a portfolio management team. Mr. Mauro and Ms. Uyehara have been Portfolio Managers of the Fund since 2018 and 2021, respectively.

Purchase and Sale of Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

S-16

Table of Contents

More Information About the Fund

Effective December 1, 2021, the Fund is no longer actively managed and the Fund's new Underlying Index is the BlackRock Inflation Hedged Corporate Bond Index.

ETFs are funds that trade like other publicly-traded securities. The Fund is designed to track an index, which was created and is sponsored by the Index Provider, an affiliated person of the Fund and of BFA. Similar to shares of an index mutual fund, each share of the Fund represents an ownership interest in an underlying portfolio of securities and other instruments intended to track a market index. Unlike shares of a mutual fund, which can be bought and redeemed from the issuing fund by all shareholders at a price based on NAV, shares of the Fund may be purchased or redeemed directly from the Fund at NAV solely by Authorized Participants and only in aggregations of a specified number of shares (“Creation Units”). Also unlike shares of a mutual fund, shares of the Fund are listed on a national securities exchange and trade in the secondary market at market prices that change throughout the day.

The Fund invests in a particular segment of the financial market and seeks to track the performance of an inflation hedged index that is not representative of the market as a whole. The Fund is designed to be used as part of broader asset allocation strategies. Accordingly, an investment in the Fund should not constitute a complete investment program.

“Tracking error” is the divergence of the Fund's performance from that of the Underlying Index. Because the Fund uses a representative sampling indexing strategy,

Table of Contents

it can be expected to have a larger tracking error than if it used a replication indexing strategy. “Replication” is an indexing strategy in which a fund invests in substantially all of the securities in its underlying index in approximately the same proportions as in the underlying index.

An investment in the Fund is not a bank deposit and it is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, BFA or any of its affiliates.

The Fund's investment objective and the Underlying Index may be changed without shareholder approval.

A Further Discussion of Principal Risks

The Fund is subject to various risks, including the principal risks noted below, any of which may adversely affect the Fund’s NAV, trading price, yield, total return and ability to meet its investment objective. The Fund may be exposed to these risks directly or indirectly through the Fund's investments in the Underlying Fund. You could lose all or part of your investment in the Fund, and the Fund could underperform other investments. The order of the below risk factors does not indicate the significance of any particular risk factor.

Asset Class Risk. The securities and other assets in the Fund’s or the Underlying Fund's portfolio may underperform in comparison to other securities or indexes that track other issuers, countries, groups of countries, regions, industries, groups of industries, markets, market segments, asset classes or sectors. Various types of securities may experience cycles of outperformance and underperformance in comparison to the general financial markets depending upon a number of factors including, among other things, inflation, interest rates, productivity, global demand for local products or resources, and regulation and governmental controls. This may cause the Fund to underperform other investment vehicles that invest in different asset classes or do not seek to hedge the rate of inflation.

Authorized Participant Concentration Risk. Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem Creation Units, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting. Authorized Participant concentration risk may be heightened

Table of Contents

because ETFs, such as the Fund, that invest in securities issued by non-U.S. issuers or other securities or instruments that are less widely traded often involve greater settlement and operational issues and capital costs for Authorized Participants, which may limit the availability of Authorized Participants.

Calculation Methodology Risk. The Underlying Index relies on various sources of information to assess the criteria of issuers included in the Underlying Index , including information that may be based on assumptions and estimates. Neither the Fund nor BFA can offer assurances that the Underlying Index's calculation methodology or sources of information will provide an accurate assessment of included issuers.

Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund or the Underlying Fund may “call” or repay the security before its stated maturity, and the Fund or the Underlying Fund may have to reinvest the proceeds in securities with lower yields or interest rates that would not benefit from the hedging strategies used by the Fund. This might result in a decline in the Fund’s income, or in the Fund holding bonds or exposure to bonds that is not hedged through the instruments used by the Fund to hedge inflation risk.

Cash Management Risk. To the extent the Fund holds cash, the Fund will earn reduced income (if any) on the cash and will be subject to the credit risk of the depository institution holding the cash and any fees imposed on large cash balances. If a significant amount of the Fund’s assets are invested in cash and cash equivalents, it will be more difficult for the Fund to achieve its investment objective. The Fund may underperform other funds that do not similarly invest in cash and cash equivalents for investment purposes and/or to collateralize derivative instruments.

Commodity Regulatory Risk. The Fund is deemed a “commodity pool” and BFA is considered a “commodity pool operator” with respect to the Fund under the CEA. BFA is therefore subject to regulation by the SEC and the CFTC. BFA is also subject to regulation by the NFA. The regulatory requirements governing the use of commodity futures, options on commodity futures, certain swaps or certain other investments could change at any time.

Table of Contents

underperformance of those securities and/or other assets and other instruments, may experience increased price volatility and may be more susceptible to adverse economic, market, political or regulatory occurrences affecting those securities and/or other assets than a fund that does not concentrate its investments.

Consumer Staples Sector Risk. Companies in the consumer staples sector may be affected by the regulation of various product components and production methods, marketing campaigns and changes in the global economy, consumer spending and consumer demand. Tobacco companies, in particular, may be adversely affected by new laws, regulations and litigation. Companies in the consumer staples sector may also be adversely affected by changes or trends in commodity prices, which may be influenced by unpredictable factors. These companies may be subject to severe competition, which may have an adverse impact on their profitability.

Credit Risk. Credit risk is the risk that the issuer or guarantor of a debt instrument or the counterparty to a derivatives contract, repurchase agreement or loan of portfolio securities will be unable or unwilling to make its timely interest and/or principal payments when due or otherwise honor its obligations. There are varying degrees of credit risk, depending on an issuer’s or counterparty’s financial condition and on the terms of an obligation, which may be reflected in the issuer’s or counterparty’s credit rating. There is the chance that the Fund’s or the Underlying Fund's portfolio holdings will have their credit ratings downgraded or will default (i.e., fail to make scheduled interest or principal payments), or that the market’s perception of an issuer’s creditworthiness may worsen, potentially reducing the Fund’s or the Underlying Fund's income level or share price, which may adversely affect the value of the Fund. The Fund’s hedging strategy does not seek to mitigate credit risk.

Cybersecurity Risk. With the increased use of technologies such as the internet to conduct business, the Fund, the Underlying Fund, Authorized Participants, service providers and the relevant listing exchange are susceptible to operational, information security and related “cyber” risks both directly and through their service providers. Similar types of cybersecurity risks are also present for issuers of securities in which the Fund or the Underlying Fund invests, which could result in material adverse consequences for such issuers and may cause the Fund’s or the Underlying Fund's investment in such issuers to lose value. In general, cyber incidents can result from deliberate attacks or unintentional events. Cyber incidents include, but are not limited to, gaining unauthorized access to digital systems (e.g., through “hacking” or malicious software coding) for purposes of misappropriating assets or sensitive information, corrupting data, or causing operational disruption. Cyberattacks may also be carried out in a manner that does not require gaining unauthorized access, such as causing denial-of-service attacks on websites (i.e., efforts to make network services unavailable to intended users). Recently, geopolitical tensions may have increased the scale and sophistication of deliberate attacks, particularly those from nation-states or from entities with nation-state backing.

Cybersecurity failures by, or breaches of, the systems of the Fund's or the Underlying Fund's adviser, distributor and other service providers (including, but not limited to,

Table of Contents

index and benchmark providers, fund accountants, custodians, transfer agents and administrators), market makers, Authorized Participants or the issuers of securities in which the Fund or the Underlying Fund invests have the ability to cause disruptions and impact business operations, potentially resulting in: financial losses, interference with the Fund’s or the Underlying Fund's ability to calculate its NAV, disclosure of confidential trading information, impediments to trading, submission of erroneous trades or erroneous creation or redemption orders, the inability of the Fund, the Underlying Fund or their service providers to transact business, violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, reimbursement or other compensation costs, or additional compliance costs. In addition, cyberattacks may render records of Fund assets and transactions, shareholder ownership of Fund shares, and other data integral to the functioning of the Fund or the Underlying Fund inaccessible, inaccurate or incomplete. Substantial costs may be incurred by the Fund or the Underlying Fund in order to resolve or prevent cyber incidents in the future. While the Fund and the Underlying Fund have established business continuity plans in the event of, and risk management systems to prevent, such cyber incidents, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, that prevention and remediation efforts will not be successful or that cyberattacks will go undetected. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund or Underlying Fund, issuers in which the Fund or Underlying Fund invests, the Index Provider, hedging counterparties to the Fund or Underlying Fund, market makers or Authorized Participants. The Fund and its shareholders could be negatively impacted as a result.

Derivatives Risk. The Fund’s or Underlying Fund's use of derivatives may reduce the Fund’s or Underlying Fund's returns or increase volatility. Volatility is defined as the characteristic of a security, a currency, an index or a market to fluctuate significantly in price within a short time period. Derivatives may also be subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. Counterparty risk for OTC derivatives is generally higher than that for derivatives traded on an exchange or through a clearing house. A risk of the Fund’s or Underlying Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the value of the underlying asset, the performance of the asset class to which the Fund or Underlying Fund seeks exposure or the performance of the overall markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund or Underlying Fund to sell or otherwise close a derivatives position could expose the Fund or Underlying Fund to losses and could make derivatives more difficult for the Fund or Underlying Fund to value accurately. The Fund or Underlying Fund could also suffer losses related to its derivatives positions as a result of unanticipated market movements, or movements between the time of periodic reallocations of Fund or Underlying Fund assets, which losses are potentially unlimited. Certain derivatives may give rise to a form of leverage and may expose the Fund or Underlying Fund to greater risk and increase its costs. The impact of U.S. and global regulation of derivatives may make derivatives more costly, may limit the availability of derivatives, may delay or restrict the exercise by the Fund or Underlying Fund of termination rights or remedies upon a counterparty default under derivatives

Table of Contents

held by the Fund or Underlying Fund (which could result in losses), or may otherwise adversely affect the value or performance of derivatives.

Financials Sector Risk. Companies in the financials sector of an economy are subject to extensive governmental regulation and intervention, which may adversely affect the scope of their activities, the prices they can charge, the amount of capital they must maintain and, potentially, their size. The extent to which the Fund or the Underlying Fund may invest in a company that engages in securities-related activities or banking is limited by applicable law. Governmental regulation may change frequently and may have significant adverse consequences for companies in the financials sector, including effects not intended by such regulation. Recently enacted legislation in the U.S. has relaxed capital requirements and other regulatory burdens on certain U.S. banks. While the effect of the legislation may benefit certain companies in the financials sector, increased risk taking by affected banks may also result in greater overall risk in the U.S. and global financials sector. The impact of changes in capital requirements, or recent or future regulation in various countries, on any individual financial company or on the financials sector as a whole cannot be predicted.

Geographic Risk. Some of the companies in which the Fund or the Underlying Fund invests are located in parts of the world that have historically been prone to natural disasters, such as earthquakes, tornadoes, volcanic eruptions, droughts, floods, hurricanes or tsunamis, and are economically sensitive to environmental events. Any such event may adversely impact the economies of these geographic areas or business operations of companies in these geographic areas, causing an adverse impact on the value of the Fund or Underlying Fund.

Table of Contents

Hedging Risk. When a derivative is used as a hedge against a position that the Fund holds, any loss generated by the derivative generally should be substantially offset by gains on the hedged investment, and vice versa. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains. Hedges are sometimes subject to imperfect matching between the derivative and the underlying security, and there can be no assurance that the Fund’s hedging transactions, which entail additional transaction costs, will be effective.

The Fund seeks to mitigate the potential impact of rising inflation rates on the performance of investment-grade corporate bonds by investing in inflation hedging instruments. An inflation swap is a contract in which one party pays a floating rate linked to an inflation index on a notional amount and the other party pays a fixed rate. The positions are not intended to mitigate credit risk, interest rate risk or certain other factors influencing the price of investment-grade corporate bonds, which may have a greater impact on the bonds’ return than rising or falling inflation rates. There is no guarantee that the Fund’s positions in inflating hedging instruments will completely eliminate the inflation risk of the long positions in investment-grade corporate bonds. In addition, when interest rates fall, but inflation does not, investors may be better off in a long–only investment-grade investment than with an investment in the Fund. Performance of the Fund could be particularly poor in risk-averse, flight-to-quality environments when it is common for investment-grade corporate bonds and in deflationary environments. Furthermore, the Fund may be more volatile than a long-only investment in investment-grade corporate bonds. The Fund may contain a significant allocation to callable investment-grade corporate bonds, which are subject to call risk and prepayment risk (see Call Risk and Prepayment Risk); callable bonds may have lower sensitivity to interest rate declines than non-callable bonds or U.S. Treasury futures. There is no guarantee the Fund will have positive returns, even in environments of sharply rising inflation rates in which the Fund’s positions in inflation hedging instruments might be expected to mitigate the effects of such rises. Moreover, to the extent that inflation risk has been priced into the investment-grade corporate bonds owned by the Fund or the Underlying Fund, the Fund will underperform the Underlying Fund even during inflationary periods. The Fund will incur expenses when entering into positions in inflation hedging instruments. The use of hedging may result in certain adverse tax consequences, as noted in the Taxes section of the Prospectus.

Table of Contents

no assurance that a security or instrument that is deemed to be liquid when purchased will continue to be liquid for as long as it is held by the Fund, and any security or instrument held by the Fund may be deemed an illiquid investment pursuant to the Fund’s liquidity risk management program. Illiquid investments may be harder to value, especially in changing markets. Although the Fund primarily seeks to redeem shares of the Fund on an in-kind basis, if the Fund is forced to sell underlying investments at reduced prices or under unfavorable conditions to meet redemption requests or for other cash needs, the Fund may suffer a loss. This may be magnified in a rising interest rate environment or other circumstances where redemptions from the Fund may be greater than normal. Other market participants may be attempting to liquidate holdings at the same time as the Fund, causing increased supply of the Fund’s underlying investments in the market and contributing to illiquid investments risk and downward pricing pressure. During periods of market volatility, liquidity in the market for the Fund’s shares may be impacted by the liquidity in the market for the underlying securities or instruments held by the Fund, which could lead to the Fund’s shares trading at a premium or discount to the Fund's NAV.

Income Risk. The Fund’s income may decline if yields fall because the Fund or the Underlying Fund may hold a significant portion of short duration securities and/or securities that have floating or variable interest rates that do not benefit from the hedges entered into by the Fund. The Fund’s income may decline because the Fund or the Underlying Fund invests in lower yielding bonds as bonds in its portfolio mature, are near maturity or are called, or when the Fund or the Underlying Fund needs to purchase additional bonds. Hedges entered into by the Fund may not be effective to hedge inflationary risk and, in this case, the income of the Fund may fall because both the securities of the Fund drop in value and the value of the futures and swaps held by the Fund declines.

Index-Related Risk. The Fund seeks to achieve a return that corresponds generally to the price and yield performance, before fees and expenses, of the Underlying Index as published by the Index Provider. There is no assurance that the Index Provider or any agents that may act on its behalf will compile the Underlying Index accurately, or that the Underlying Index will be determined, composed or calculated accurately. While the Index Provider provides descriptions of what the Underlying Index is designed to achieve, neither the Index Provider nor its agents provide any warranty or accept any liability in relation to the quality, accuracy or completeness of the Underlying Index or its related data, and they do not guarantee that the Underlying Index will be in line with the Index Provider’s methodology. BFA’s mandate as described in this Prospectus is to manage the Fund consistently with the Underlying Index provided by the Index Provider to BFA. BFA does not provide any warranty or guarantee against the Index Provider’s or any agent’s errors. Errors in respect of the quality, accuracy and completeness of the data used to compile the Underlying Index may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, particularly where the indices are less commonly used as benchmarks by funds or managers. Such errors may negatively or positively impact the Fund and its shareholders. For example, during a period where the Underlying Index contains incorrect constituents, the Fund would have market exposure to such constituents and would be underexposed to the Underlying Index’s other constituents. Shareholders

Table of Contents

should understand that any gains from Index Provider errors will be kept by the Fund and its shareholders and any losses or costs resulting from Index Provider errors will be borne by the Fund and its shareholders. Because the Index Provider is relatively new to the creation of securities indexes, there may be a greater risk that index errors will not be detected as quickly as they might be in the case of an index maintained by a long-standing index provider.

Unusual market conditions may cause the Index Provider to postpone a scheduled rebalance to the Underlying Index, which could cause the Underlying Index to vary from its normal or expected composition. The postponement of a scheduled rebalance in a time of market volatility could mean that constituents of the Underlying Index that would otherwise be removed at rebalance due to changes in market value, issuer credit ratings, or other reasons may remain, causing the performance and constituents of the Underlying Index to vary from those expected under normal conditions. Apart from scheduled rebalances, the Index Provider or its agents may carry out additional ad hoc rebalances to the Underlying Index due to reaching certain weighting constraints, unusual market conditions or corporate events or, for example, to correct an error in the selection of index constituents. When the Underlying Index is rebalanced and the Fund in turn rebalances its portfolio to attempt to increase the correlation between the Fund’s portfolio and the Underlying Index, any transaction costs and market exposure arising from such portfolio rebalancing will be borne directly by the Fund and its shareholders. Therefore, errors and additional ad hoc rebalances carried out by the Index Provider or its agents to the Underlying Index may increase the costs to and the tracking error risk of the Fund.

■

Table of Contents

	issuers of equity securities have cancelled or announced the suspension of dividends. The outbreak has, and may continue to, negatively affect the credit ratings of some fixed-income securities and their issuers.
■	Market Closures. Certain local markets have been or may be subject to closures, and there can be no assurance that trading will continue in any local markets in which the Fund or the Underlying Fund may invest, when any resumption of trading will occur or, once such markets resume trading, whether they will face further closures. Any suspension of trading in markets in which the Fund or the Underlying Fund invests will have an impact on the Fund or Underlying Fund and its investments and will impact the Fund’s or the Underlying Fund's ability to purchase or sell securities in such markets.
■	Operational Risk. The outbreak could also impair the information technology and other operational systems upon which the Fund’s service providers, including BFA, rely, and could otherwise disrupt the ability of employees of the Fund's service providers to perform critical tasks relating to the Fund, for example, due to the service providers’ employees performing tasks in alternate locations than under normal operating conditions or the illness of certain employees of the Fund's service providers.
■	Governmental Interventions. Governmental and quasi-governmental authorities and regulators throughout the world have responded to the outbreak and the resulting economic disruptions with a variety of fiscal and monetary policy changes, including direct capital infusions into companies and other issuers, new monetary policy tools, and lower interest rates. An unexpected or sudden reversal of these policies, or the ineffectiveness of such policies, is likely to increase market volatility, which could adversely affect the Fund’s investments.
■	Pre-Existing Conditions. Public health crises caused by the outbreak may exacerbate other pre-existing political, social and economic risks in certain countries or globally, which could adversely affect the Fund and its investments and could result in increased premiums or discounts to the Fund's NAV.

Other infectious illness outbreaks that may arise in the future could have similar or other unforeseen effects.

Inflation-Linked Instruments Risk. The returns of CPI swaps and other inflation-linked instruments that may be used by the Fund to hedge inflation risk reflect a specified index of inflation measured by the CPI. There can be no assurance that the CPI or other inflation index used will accurately measure either the actual rate of inflation experienced in the U.S. or the rate of expected future inflation reflected in the prices and yields of bonds held by the Fund. As a result, the Fund’s inflation-hedging strategy may not perform as expected. CPI swaps may be riskier than other types of investments because they may be more sensitive to changes in economic or market conditions. CPI swaps create leverage because they rely on future payments, which may cause the Fund’s NAV and returns to be more volatile than they would be if the Fund had not used swaps. CPI swaps also expose the Fund to counterparty risk, which is the risk that the swap counterparty will not fulfill its contractual obligations. The Fund’s hedging strategy is not customized to particular bonds or investment instruments. As a result, there may be a mismatch between the CPI swaps (and other

Table of Contents

inflation-linked instruments) and the bonds held by the Fund that are being hedged. If this were the case, the Fund could lose money on both the inflation hedging instruments and the bonds, and the present value of the Fund’s portfolio investments could decrease if inflation increases.

By entering into a CPI swap, the Fund effectively turns the inflation component of the bonds held by the Fund or the Underlying Fund from fixed rates into floating rates. The Fund will lose money on the CPI swap and underperform if inflation is lower than the expected rate being hedged. The Fund will benefit from a CPI swap if actual inflation (as measured by the CPI) during the time period in which the Fund holds the swap is the same or greater than the level of inflation expected for that period. However, if actual inflation (as measured by the CPI) is less than the rate of inflation expected for that period, the Fund generally will lose money on the CPI swap and underperform the Underlying Fund as a result of having entered into the CPI swap.

Interest Rate Risk. If interest rates rise, the value of fixed-income securities or other instruments held by the Fund or the Underlying Fund would likely decrease. A measure investors commonly use to determine this price sensitivity is called duration. Fixed-income securities with longer durations tend to be more sensitive to interest rate changes, usually making their prices more volatile than those of securities with shorter durations. To the extent the Fund or the Underlying Fund invests a substantial portion of its assets in fixed-income securities with longer duration, rising interest rates may cause the value of the Fund's or the Underlying Fund's investments to decline significantly, which may adversely affect the value of the Fund. To the extent such rises are linked to increases in inflation, the inflation hedging instruments used by the Fund are designed to off-set such decreases in value. Even if the hedging strategy of the Fund performs as intended, however, an increase in interest rates may lead to heightened volatility in the fixed-income markets and adversely affect certain fixed-income investments, including those held by the Fund or the Underlying Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. In addition, decreases in fixed income dealer market-making capacity may lead to lower trading volume, heightened volatility, wider bid-ask spreads and less transparent pricing in certain fixed-income markets.

Table of Contents

dividends to Fund shareholders. Certain countries have recently experienced negative interest rates on certain fixed-income instruments. Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, result in heightened market volatility and detract from the Fund’s performance to the extent the Fund is exposed to such interest rates. Additionally, under certain market conditions in which interest rates are set at low levels and the market prices of portfolio securities have increased, the Fund or the Underlying Fund may have a very low or even negative yield. A low or negative yield would cause the Fund or the Underlying Fund to lose money in certain conditions and over certain time periods. Central banks may increase their short-term policy rates or begin phasing out, or “tapering,” accommodative monetary policy facilities in the future. The timing, coordination, magnitude and effect of such policy changes on various markets are uncertain, and such changes in monetary policy may adversely affect the value of the Fund’s investments.

The Fund seeks to mitigate inflation risk, to the extent that increases are tied to inflation, by using inflation hedging instruments; such positions should increase in value in rising inflationary environments and should decrease in value in falling inflationary environments, thereby mitigating potential gains and losses in the Underlying Fund arising from changing rates of inflation. The Fund does not attempt to mitigate credit risk, interest rate risk generally or other factors, which may have a greater influence on returns of the Underlying Fund than inflation risk. Because the Fund’s inflationary hedge is reset on a periodic basis, inflation risk can develop intra-period. Furthermore, while the Fund is designed to hedge the inflation rate exposure of the Underlying Fund, it is possible that a degree of exposure may remain even at the time of rebalance.

Interest Rate Swap Risk. Interest rate swaps consist of an exchange between counterparties of their rights to receive interest payments based on a reference interest rate and typically involve the payment by one counterparty of a fixed rate in respect of a defined notional amount in exchange for receipt of a floating rate on the same notional amount, each having the same payment dates and payable in the same currency. Interest rate swaps are subject to risks applicable to swaps generally, including the risk that a counterparty fails to meet its obligations and the risk that the Fund is not able to liquidate such swap in a timely manner or at all, which could result in losses to the Fund. Because the Fund invests in swaps that are subject to central clearing, these swaps are subject to the risk that a central clearinghouse will go into bankruptcy or become non-operational, and sometimes involve increased transaction costs. Counterparties to OTC swaps are not subject to these risks. The Fund’s use of interest rate swaps requires it to post collateral, which may restrict the Fund’s ability to otherwise invest such collateral and involves additional costs to the Fund. An interest rate swap may fail to perform as intended and may not offset adverse changes in interest rates fully or at all. An interest rate swap may also reduce the Fund’s gains due to favorable changes in interest rates and result in losses to the Fund. Counterparties to interest rate swaps are subject to manipulation in the marketplace of the reference benchmark rate, which may affect the utility of the swap as a hedge.

Table of Contents

Investment in the Underlying Fund Risk. The Fund expects to invest a substantial portion of its assets in the Underlying Fund, so the Fund’s investment performance is likely to be directly related to the performance of the Underlying Fund, adjusted for the impact of changes in the rate of inflation. The Fund’s NAV will change with changes in the value of the Underlying Fund and other securities in which the Fund invests based on their market valuations. An investment in the Fund will entail more direct and indirect costs and expenses than a direct investment in the Underlying Fund. For example, the Fund indirectly pays a portion of the expenses (including operating expenses and management fees) incurred by the Underlying Fund.

An investor in the Fund may receive taxable gains from portfolio transactions by the Underlying Fund, as well as taxable gains from transactions in shares of the Underlying Fund by the Fund.

Issuer Risk. The performance of the Fund depends on the performance of individual securities to which the Fund or the Underlying Fund has exposure. The Fund may be adversely affected if an issuer of underlying securities held by the Fund or the Underlying Fund is unable or unwilling to repay principal or interest when due. Any issuer of these securities may perform poorly, causing the value of its securities to decline. Poor performance may be caused by poor management decisions, competitive pressures, changes in technology, expiration of patent protection, disruptions in supply, labor problems or shortages, corporate restructurings, fraudulent disclosures, credit deterioration of the issuer or other factors. Changes to the financial condition or credit rating of an issuer of those securities may cause the value of the securities to decline. An issuer may also be subject to risks associated with the countries, states and regions in which the issuer resides, invests, sells products, or otherwise conducts operations.

Table of Contents

their investments and could result in increased premiums or discounts to the Fund’s or Underlying Fund's NAV. During a general market downturn, multiple asset classes may be negatively affected. Fixed-income securities and other instruments with short-term maturities are generally less sensitive to such changes than are fixed-income securities and other instruments with longer-term maturities. Changes in market conditions and interest rates will not have the same impact on all types of securities and other instruments.

Market Trading Risk.

Absence of Active Market. Although shares of the Fund and the Underlying Fund are listed for trading on one or more stock exchanges, there can be no assurance that an active trading market for such shares will develop or be maintained by market makers or Authorized Participants.

Risk of Secondary Listings. The Fund's and the Underlying Fund's shares may be listed or traded on U.S. and non-U.S. stock exchanges other than the U.S. stock exchange where the Fund's primary listing is maintained, and may otherwise be made available to non-U.S. investors through funds or structured investment vehicles similar to depositary receipts. There can be no assurance that the Fund’s or the Underlying Fund's shares will continue to trade on any such stock exchange or in any market or that the Fund’s or the Underlying Fund's shares will continue to meet the requirements for listing or trading on any exchange or in any market. The Fund's or the Underlying Fund's shares may be less actively traded in certain markets than in others, and investors are subject to the execution and settlement risks and market standards of the market where they or their broker direct their trades for execution. Certain information available to investors who trade Fund or Underlying Fund shares on a U.S. stock exchange during regular U.S. market hours may not be available to investors who trade in other markets, which may result in secondary market prices in such markets being less efficient.

Secondary Market Trading Risk. Shares of the Fund or the Underlying Fund may trade in the secondary market at times when the Fund or the Underlying Fund does not accept orders to purchase or redeem shares. At such times, shares may trade in the secondary market with more significant premiums or discounts than might be experienced at times when the Fund or the Underlying Fund accepts purchase and redemption orders. If the Fund purchases shares of the Underlying Fund at a time when the market price of Underlying Fund shares is at a premium to NAV or sells Underlying Fund shares when their market price is at a discount to NAV, the Fund may incur losses.

Secondary market trading in Fund or Underlying Fund shares may be halted by a stock exchange because of market conditions or for other reasons. In addition, trading in Fund or Underlying Fund shares on a stock exchange or in any market may be subject to trading halts caused by extraordinary market volatility pursuant to “circuit breaker” rules on the stock exchange or market.

Table of Contents

activity in derivative products based on the Fund or the Underlying Fund may lead to increased trading volume and volatility in the secondary market for the shares of the Fund.

Shares of the Fund and the Underlying Fund May Trade at Prices Other Than NAV. Shares of the Fund and the Underlying Fund trade on stock exchanges at prices at, above or below the respective Fund’s and the Underlying Fund's most recent NAV. The NAV of the Fund and the Underlying Fund are calculated at the end of each business day and fluctuate with changes in the market value of the Fund’s or the Underlying Fund's holdings. The trading price of the Fund's and the Underlying Fund's shares fluctuates continuously throughout trading hours based on both market supply of and demand for their shares and the underlying value of their portfolio holdings or NAV. As a result, the trading prices of the Fund’s and the Underlying Fund's shares may deviate significantly from NAV during periods of market volatility, including during periods of significant redemption requests or other unusual market conditions. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S OR THE UNDERLYING FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV. However, because shares can be created and redeemed in Creation Units at NAV, BFA believes that large discounts or premiums to the NAV of the Fund or the Underlying Fund, as applicable, are not likely to be sustained over the long term (unlike shares of many closed-end funds, which frequently trade at appreciable discounts from, and sometimes at premiums to, their NAVs). While the creation/redemption feature is designed to make it more likely that the Fund’s or the Underlying Fund's shares normally will trade on stock exchanges at prices close to the Fund’s or the Underlying Fund's next calculated NAV, exchange prices are not expected to correlate exactly with the NAV due to timing reasons, supply and demand imbalances and other factors. In addition, disruptions to creations and redemptions, including disruptions at market makers, Authorized Participants, or other market participants, and during periods of significant market volatility, may result in trading prices for shares of the Fund or the Underlying Fund that differ significantly from their respective NAV. Authorized Participants may be less willing to create or redeem Fund or Underlying Fund shares if there is a lack of an active market for such shares or its underlying investments, which may contribute to the Fund’s or Underlying Fund's shares trading at a premium or discount to NAV.

Table of Contents

advisable for investors who anticipate regularly making small investments through a brokerage account.

Non-U.S. Issuers Risk. Securities issued by non-U.S. issuers have different risks from securities issued by U.S. issuers. These risks include differences in accounting, auditing and financial reporting standards, the possibility of expropriation or confiscatory taxation, adverse changes in investment or exchange control regulations, political instability which could affect U.S. investments in non-U.S. countries, uncertainties of transnational litigation, and potential restrictions on the flow of international capital, including the possible seizure or nationalization of the securities issued by non-U.S. issuers held by the Fund or the Underlying Fund. Non-U.S. issuers may be subject to less governmental regulation than U.S. issuers. Moreover, individual non-U.S. economies may differ favorably or unfavorably from the U.S. economy in such respects as growth of gross domestic product, rate of inflation, capital reinvestment, resource self-sufficiency and balance of payment positions. Unfavorable political, economic or governmental developments in non-U.S. countries could affect the payment of a security’s principal and interest. Securities issued by non-U.S. issuers may also be less liquid than, and more difficult to value than, securities of U.S. issuers. In addition, the value of these securities may fluctuate due to changes in the exchange rate of the issuer’s local currency against the U.S. dollar.

Operational Risk. The Fund and the Underlying Fund are exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund's or the Underlying Fund's service providers, counterparties or other third parties, failed or inadequate processes and technology or systems failures. The Fund, the Underlying Fund and BFA seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

Passive Investment Risk. The Fund and the Underlying Fund are not actively managed and may be affected by a general decline in market segments related to the applicable Underlying Index. The Fund and the Underlying Fund invest in securities included in, or representative of, the applicable Underlying Index, regardless of their investment merits. BFA generally does not attempt to invest the Fund's assets in defensive positions under any market conditions, including declining markets. The Fund may also be exposed to passive investment risk through its investment in the Underlying Fund.

Prepayment Risk. During periods of falling interest rates, issuers of certain debt obligations may repay principal prior to the security’s maturity, which may cause the Fund or the Underlying Fund to have to reinvest in securities with lower yields or higher risk of default, resulting in a decline in the Fund’s or the Underlying Fund's income or return potential. Also, if a security subject to prepayment had been purchased at a premium, the value of the premium would be lost in the event of prepayment.

Table of Contents

primary means of economic growth. A prolonged slowdown in one or more services sectors is likely to have a negative impact on economies of certain developed countries, although economies of individual developed countries can be impacted by slowdowns in other sectors. In the past, certain developed countries have been targets of terrorism, and some geographic areas in which the Fund or the Underlying Fund invests have experienced strained international relations due to territorial disputes, historical animosities, defense concerns and other security concerns. These situations may cause uncertainty in the financial markets in these countries or geographic areas and may adversely affect the performance of the issuers to which the Fund or the Underlying Fund has exposure. Heavy regulation of certain markets, including labor and product markets, may have an adverse effect on certain issuers. Such regulations may negatively affect economic growth or cause prolonged periods of recession. Many developed countries are heavily indebted and face rising healthcare and retirement expenses. In addition, price fluctuations of certain commodities and regulations impacting the import of commodities may negatively affect developed country economies.

Risk of Swap Agreements. Swaps may be leveraged and are subject to counterparty risk (e.g., the risk of a counterparty defaulting on the obligation or bankruptcy), credit risk and pricing risk (i.e., swaps may be difficult to value). Swaps may be subject to illiquidity risk, and it may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses. Certain standardized swaps are subject to mandatory central clearing. Central clearing is expected to reduce counterparty credit risk and increase liquidity, but central clearing does not make swap transactions risk-free. All swaps require posting of collateral, which may restrict the ability of the Fund to invest the assets in different ways and which involve costs to the Fund. Swaps provide customized contractual terms, which may not, in all cases, provide the hedging or other intended benefits.

Table of Contents

Securities Lending Risk. The Fund or the Underlying Fund may engage in securities lending. Securities lending involves the risk that the Fund or the Underlying Fund may lose money because the borrower of the loaned securities fails to return the securities in a timely manner or at all. The Fund or the Underlying Fund could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. These events could also trigger adverse tax consequences for the Fund or the Underlying Fund. BlackRock Institutional Trust Company, N.A. (“BTC”), the Fund's securities lending agent, will take into account the tax impact to shareholders of substitute payments for dividends when managing the Fund's securities lending program.

Tax Risk. The Fund invests in derivatives. The federal income tax treatment of a derivative may not be as favorable as a direct investment in an underlying asset or may have other adverse consequences. Derivatives may produce taxable income and taxable realized gain. Derivatives may adversely affect the timing, character and amount of income the Fund realizes from its investments. As a result, a larger portion of the Fund’s distributions may be treated as ordinary income rather than as capital gains. In addition, certain derivatives are subject to mark-to-market or straddle provisions of the Internal Revenue Code. If such provisions are applicable, there could be an increase (or decrease) in the amount of taxable dividends paid by the Fund. Income from swaps is generally taxable. In addition, the tax treatment of certain derivatives, such as swaps, is unsettled and may be subject to future legislation, regulation or administrative pronouncements issued by the IRS. Because the Fund invests in the Underlying Fund, the Fund’s realized losses on sales of shares of the Underlying Fund may be indefinitely or permanently deferred as “wash sales.” Distributions of short-term capital gains by the Underlying Fund will be recognized as ordinary income by the Fund and would not be offset by the Fund’s capital loss carryforwards, if any. Capital loss carryforwards of the Underlying Fund, if any, would not offset net capital gains of the Fund. Each of these effects is caused by the Fund’s investment in the Underlying Fund and may result in distributions to Fund shareholders being of higher magnitude and less likely to qualify for lower capital gain tax rates than if the Fund were to invest directly in the securities and other instruments composing its portfolio.

Tracking Error Risk. The Fund may be subject to “tracking error,” which is the divergence of the Fund’s performance from that of the Underlying Index. Tracking error may occur because of differences between the securities and other instruments held in the Fund’s portfolio and those included in the Underlying Index, pricing differences (including, as applicable, differences between a security’s price at the local market close and the Fund's or an Underlying Fund's valuation of a security at the time of calculation of the Fund's or Underlying Fund's NAV, respectively), transaction costs incurred by the Fund, the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be heightened during times of increased market volatility or other unusual market conditions. Tracking error

Table of Contents

also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX ETFs THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN SWAP CONTRACTS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

Valuation Risk. The price the Fund and the Underlying Fund could receive upon the sale of a security or unwind of a financial instrument or other asset may differ from the Fund's or the Underlying Fund's valuation of the security, instrument or other asset, particularly for securities or other instruments that trade in low volume or volatile markets or that are valued using a fair value methodology as a result of trade suspensions or for other reasons. Because non-U.S. exchanges may be open on days when the Underlying Fund does not price its shares, the value of the securities or other instruments in the Fund's or the Underlying Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund’s or the Underlying Fund's shares. In addition, for purposes of calculating the Fund's NAV, the value of assets denominated in non-U.S. currencies is translated into U.S. dollars at the prevailing market rates. This translation may result in a difference between the prices used to calculate the Fund's NAV and the prices used by the Underlying Index, which, in turn, could result in a difference between the Fund's performance and the performance of the Underlying Index. Authorized Participants who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

A Further Discussion of Other Risks

The Fund may also be subject to certain other risks associated with its investments and investment strategies either directly or indirectly through the Fund's investments in the Underlying Fund. The order of the below risk factors does not indicate the significance of any particular risk factor.

Table of Contents

services industry group include providers of fiber-optic, fixed-line, cellular and wireless telecommunications networks. Companies in the media and entertainment industry group encompass a variety of services and products including television broadcasting, gaming products, social media, networking platforms, online classifieds, online review websites, and Internet search engines. Companies in the communication services sector may be affected by industry competition, substantial capital requirements, government regulation, and obsolescence of communications products and services due to technological advancement. Fluctuating domestic and international demand, shifting demographics and often unpredictable changes in consumer tastes can drastically affect a communication services company's profitability. In addition, while all companies may be susceptible to network security breaches, certain companies in the communication services sector may be particular targets of hacking and potential theft of proprietary or consumer information or disruptions in service, which could have a material adverse effect on their businesses.

The communication services sector of a country’s economy is often subject to extensive government regulation. The costs of complying with governmental regulations, delays or failure to receive required regulatory approvals, or the enactment of new regulatory requirements may negatively affect the business of communications companies. Government actions around the world, specifically in the area of pre-marketing clearance of products and prices, can be arbitrary and unpredictable. The communications services industry can also be significantly affected by intense competition for market share, including competition with alternative technologies such as wireless communications, product compatibility and standardization, consumer preferences, rapid product obsolescence, research and development of new products, lack of standardization or compatibility with existing technologies, and a dependency on patent and copyright protections. Companies in the communication services sector may encounter distressed cash flows due to the need to commit substantial capital to meet increasing competition, particularly in developing new products and services using new technology. Technological innovations may make the products and services of certain communications companies obsolete.

Telecommunications providers with exposure to the U.S. are generally required to obtain franchises or licenses in order to provide services in a given location. Licensing and franchise rights in the telecommunications sector are limited, which may provide an advantage to certain participants. Limited availability of such rights, high barriers to market entry and regulatory oversight, among other factors, have led to consolidation of companies within the sector, which could lead to further regulation or other negative effects in the future. Telecommunication providers investing in non-U.S. countries may be subject to similar risks. Additional risks include those related to competitive challenges in the U.S. from non-U.S. competitors engaged in strategic joint ventures with U.S. companies and in non-U.S. markets from both U.S. and non-U.S. competitors.

Table of Contents

decrease in the discretionary income of targeted individuals, changing consumer tastes and interests, and the potential increase in government regulation. Companies in the media and entertainment industries may become obsolete quickly. Advertising spending can be an important revenue source for media and entertainment companies. During economic downturns advertising spending typically decreases and, as a result, media and entertainment companies tend to generate less revenue.

Consumer Cyclical Industry Risk. The success of consumer cyclical companies is tied closely to the performance of domestic and international economies, exchange rates, interest rates, competition, consumer confidence, changes in demographics and preferences. Companies in the consumer cyclical industry depend heavily on disposable household income and consumer spending, and may be strongly affected by social trends and marketing campaigns. These companies may be subject to severe competition, which may have an adverse impact on their profitability.

Energy Sector Risk. The success of companies in the energy sector may be cyclical and highly dependent on energy prices. The market value of securities issued by companies in the energy sector may decline for the following reasons, among others: changes in the levels and volatility of global energy prices, energy supply and demand, and capital expenditures on exploration and production of energy sources; exchange rates, interest rates, economic conditions, and tax treatment; and energy conservation efforts, increased competition and technological advances. Companies in this sector may be subject to substantial government regulation and contractual fixed pricing, which may increase the cost of doing business and limit the earnings of these companies. A significant portion of the revenues of these companies may depend on a relatively small number of customers, including governmental entities and utilities. As a result, governmental budget constraints may have a material adverse effect on the stock prices of companies in this sector. Energy companies may also operate in, or engage in transactions involving, countries with less developed regulatory regimes or a history of expropriation, nationalization or other adverse policies. Energy companies also face a significant risk of liability from accidents resulting in injury or loss of life or property, pollution or other environmental problems, equipment malfunctions or mishandling of materials and a risk of loss from terrorism, cyber incident, political strife or natural disasters. Any such event could have serious consequences for the general population of the affected area and could have an adverse impact on the Fund’s or the Underlying Fund's portfolio and the performance of the Fund. Energy companies can be significantly affected by the supply of, and demand for, specific products (e.g., oil and natural gas) and services, exploration and production spending, government subsidization, world events and general economic conditions. In the context of the COVID-19 outbreak and disputes among oil-producing countries regarding potential limits on the production of crude oil, the energy sector has recently experienced increased volatility. In particular, significant market volatility in the crude oil markets as well as the oil futures markets resulted in the market price of the front month WTI crude oil futures contracts falling below zero for a period of time. Energy companies may have relatively high levels of debt and may be more likely than other companies to restructure their businesses if there are downturns in energy markets or in the global economy.

Table of Contents

Responses to financial problems by European governments, central banks and others, including austerity measures and reforms, may not produce the desired results, may result in social unrest, may limit future growth and economic recovery or may have other unintended consequences. Further defaults or restructurings by governments and other entities of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In addition, one or more countries may abandon the euro and/or withdraw from the EU. The U.K. left the EU (“Brexit”) on January 31, 2020. The U.K. and EU have reached an agreement on the terms of their future trading relationship effective January 1, 2021, which principally relates to the trading of goods rather than services, including financial services. Further discussions are to be held between the U.K. and the EU in relation to matters not covered by the trade agreement, such as financial services. The Fund and the Underlying Fund face risks associated with the potential uncertainty and consequences that may follow Brexit, including with respect to volatility in exchange rates and interest rates. Brexit could adversely affect European or worldwide political, regulatory, economic or market conditions and could contribute to instability in global political institutions, regulatory agencies and financial markets. Brexit has also led to legal uncertainty and could lead to politically divergent national laws and regulations as a new relationship between the U.K. and EU is defined and the U.K. determines which EU laws to replace or replicate. Any of these effects of Brexit could adversely affect any of the companies to which the Fund has exposure and any other assets in which the Fund or the Underlying Fund invests. The political, economic and legal consequences of Brexit are not yet fully known. In the short term, financial markets may experience heightened volatility, particularly those in the U.K. and Europe, but possibly worldwide. The U.K. and Europe may be less stable than they have been in recent years, and investments in the U.K. and the EU may be difficult to value or subject to greater or more frequent volatility. In the longer term, there is likely to be a period of significant

Table of Contents

political, regulatory and commercial uncertainty as the U.K. continues to negotiate the terms of its future trading relationships.

Money Market Instruments Risk. The value of money market instruments may be affected by changing interest rates and by changes in the credit ratings of the investments. If a significant amount of the Fund's assets are invested in money market instruments, it will be more difficult for the Fund to achieve its investment objective. An investment in a money market fund is not insured or guaranteed by the FDIC or any other government agency. It is possible to lose money by investing in a money market fund. Money market funds other than government money market funds or retail money market funds “float” their NAV instead of using a stable $1.00 per share price.

Technology Sector Risk. Technology companies, including information technology companies, face intense competition, both domestically and internationally, which may have an adverse effect on a company’s profit margins. Technology companies may have limited product lines, markets, financial resources or personnel. The products of technology companies may face obsolescence due to rapid technological developments, frequent new product introduction, unpredictable changes in growth rates and competition for the services of qualified personnel. Companies in the technology sector are heavily dependent on patent and other intellectual property rights. A technology company’s loss or impairment of these rights may adversely affect the company’s profitability. Companies in the technology sector are facing increased government and regulatory scrutiny and may be subject to adverse government or

Table of Contents

regulatory action. The technology sector may also be adversely affected by changes or trends in commodity prices, which may be influenced or characterized by unpredictable factors.

Threshold/Underinvestment Risk. If certain aggregate and/or fund-level ownership thresholds are reached through transactions undertaken by BFA, its affiliates or the Fund, or as a result of third-party transactions or actions by an issuer or regulator, the ability of BFA and its affiliates on behalf of clients (including the Fund) to purchase or dispose of investments, or exercise rights or undertake business transactions, may be restricted by regulation or otherwise impaired. The capacity of the Fund to make investments in certain securities may be affected by the relevant threshold limits, and such limitations may have adverse effects on the liquidity and performance of the Fund’s portfolio holdings.

Portfolio Holdings Information

A description of the Trust's policies and procedures with respect to the disclosure of the Fund’s portfolio securities is available in the Fund's Statement of Additional Information (“SAI”). The Fund discloses its portfolio holdings daily at www.iShares.com. Fund fact sheets provide information regarding the Fund's top holdings and may be requested by calling 1-800-iShares (1-800-474-2737).

A Further Discussion of Principal Investment Strategies

Overview

The Fund allocates and reallocates its assets among direct investments in securities and other instruments, and in investments in the Underlying Fund consistent with the allocation and reallocation of securities in the Underlying Index as determined by the Index Provider. The Fund intends to invest a substantial portion of its assets in one underlying fund, the Underlying Fund. The Fund seeks to track the inflation hedging component of the Underlying Index primarily through the use of positions in inflation swaps (i.e., contracts in which the Fund makes fixed-rate payments based on a notional reference amount while receiving floating-rate payments on the same notional reference amount determined from an inflation index).

In addition, the Fund may borrow, lend its portfolio securities to brokers, dealers and financial institutions, and may invest the collateral in certain short-term instruments, either directly or through one or more money market funds, as described in greater detail in the Fund’s SAI.

The Fund invests, through the Underlying Fund, in non-U.S. securities, emerging markets securities and debt instruments, which are subject to additional risks, as described in this Prospectus and in the Fund’s SAI.

The Underlying Fund

The Fund expects to invest a substantial portion of its assets in the Underlying Fund, so the Fund’s investment performance is related to the performance of the Underlying Fund, as adjusted through the impact of inflation swaps and other inflation hedging instruments. The Fund’s NAV will change with changes in the value of the Underlying Fund and other securities in which the Fund invests subject to the Fund’s inflation

Table of Contents

hedges. An investment in the Fund will entail more direct and indirect costs and expenses than a direct investment in the Underlying Fund.

The Underlying Fund, the iShares iBoxx $ Investment Grade Corporate Bond ETF, seeks to track the performance of the Markit iBoxx^® USD Liquid Investment Grade Index. The Markit iBoxx^® USD Liquid Investment Grade Index includes liquid, U.S. dollar-denominated, investment-grade corporate bonds for sale in the U.S., as determined by the index provider. The Markit iBoxx^® USD Liquid Investment Grade Index is a trademark of and is maintained by Markit Indices Limited (“Markit”) and has been licensed for use for certain purposes by BFA or its affiliates. Markit makes no representation or warranty, expressed or implied, regarding the advisability of investing in the Underlying Fund.

In managing the Underlying Fund, BFA uses a representative sampling index strategy. Representative sampling is an indexing strategy that involves investing in a representative sample of securities that collectively have an investment profile similar to a specified benchmark index. Securities selected for the Underlying Fund are expected to have, in the aggregate, investment characteristics (based on factors such as market capitalization and industry weightings), fundamental characteristics (such as return variability and yield) and liquidity measures similar to those of the applicable underlying index. The Underlying Fund may or may not hold all of the securities that are included in its underlying index and may hold certain securities that are not included in its underlying index.

Management

Investment Adviser. As investment adviser, BFA has overall responsibility for the general management and administration of the Fund. BFA provides an investment program for the Fund and manages the investment of the Fund’s assets. In managing the Fund, BFA may draw upon the trading, research and expertise of its asset management affiliates for portfolio decisions and management with respect to portfolio securities. In seeking to achieve the Fund's investment objective, BFA uses teams of portfolio managers, investment strategists and other investment specialists. This team approach brings together many disciplines and leverages BFA’s extensive resources.

For its investment advisory services to the Fund, BFA is paid a management fee from the Fund based on a percentage of the Fund's average daily net assets, at the annual rate of 0.20%. BFA has contractually agreed to waive a portion of its management fees so that the Fund’s total annual fund operating expenses after the fee waiver are equal to the Acquired Fund Fees and Expenses attributable to the Fund’s investment in LQD, after taking into account any fee waivers by LQD, plus 0.05% through February 28,

Table of Contents

2023. The contractual waiver may be terminated prior to February 28, 2023 only upon written agreement of the Trust and BFA. In addition, BFA may from time to time voluntarily waive and/or reimburse fees or expenses in order to limit total annual fund operating expenses (excluding Acquired Fund Fees and Expenses, if any). Any such voluntary waiver or reimbursement may be eliminated by BFA at any time.

A discussion regarding the basis for the approval by the Trust's Board of Trustees (the “Board”) of the Investment Advisory Agreement with BFA is available in the Fund's Annual Report for the period ended October 31.

Portfolio Managers. James Mauro and Karen Uyehara are primarily responsible for the day-to-day management of the Fund. Each Portfolio Manager is responsible for various functions related to portfolio management, including, but not limited to, developing and implementing the Fund’s investment process and investment strategy, researching and reviewing investment strategy and overseeing members of his portfolio management team that have more limited responsibilities.

James Mauro has been employed by BFA or its affiliates as a portfolio manager since 2011. Prior to that, Mr. Mauro was a Vice President at State Street Global Advisors. Mr. Mauro has been a Portfolio Manager of the Fund since 2018.

Karen Uyehara has been employed by BFA or its affiliates as a senior portfolio manager since 2010. Prior to that, Ms. Uyehara was a portfolio manager at Western Asset Management Company (WAMCO). Ms. Uyehara has been a Portfolio Manager of the Fund since 2021.

Administrator, Custodian and Transfer Agent. State Street Bank and Trust Company (“State Street”) is the administrator, custodian and transfer agent for the Fund. JPMorgan Chase Bank, N.A. serves as custodian for the Fund in connection with certain securities lending activities.

Table of Contents

In addition, the Fund may, from time to time, enter into transactions in which BFA or an Affiliate or its or their directors, officers, employees or clients have an adverse interest.

Table of Contents

Furthermore, transactions undertaken by clients advised or managed by BFA or its Affiliates may adversely impact the Fund. Transactions by one or more clients or by BFA or its Affiliates or their directors, officers or employees may have the effect of diluting or otherwise disadvantaging the values, prices or investment strategies of the Fund.

The Fund's activities may be limited because of regulatory restrictions applicable to BFA or one or more Affiliates and/or their internal policies designed to comply with such restrictions.

Under a securities lending program approved by the Board, the Fund has retained BTC, an Affiliate of BFA, to serve as the securities lending agent for the Fund to the extent that the Fund participates in the securities lending program. For these services, the securities lending agent will receive a fee from the Fund, including a fee based on the returns earned on the Fund’s investment of the cash received as collateral for the loaned securities. In addition, one or more Affiliates may be among the entities to which the Fund may lend its portfolio securities under the securities lending program.

Shareholder Information

Table of Contents

proportional cost for investors seeking to buy or sell small amounts of shares. In addition, you may incur the cost of the “spread,” that is, any difference between the bid price and the ask price. The spread varies over time for shares of the Fund based on the Fund’s trading volume and market liquidity, and is generally lower if the Fund has high trading volume and market liquidity, and higher if the Fund has little trading volume and market liquidity (which is often the case for funds that are newly launched or small in size). The Fund's spread may also be impacted by the liquidity or illiquidity of the underlying securities held by the Fund, particularly for newly launched or smaller funds or in instances of significant volatility of the underlying securities.

The Board has adopted a policy of not monitoring for frequent purchases and redemptions of Fund shares (“frequent trading”) that appear to attempt to take advantage of a potential arbitrage opportunity presented by a lag between a change in the value of the Fund’s portfolio securities after the close of the primary markets for the Fund’s portfolio securities and the reflection of that change in the Fund’s NAV (“market timing”), because the Fund sells and redeems its shares directly through transactions that are in-kind and/or for cash, subject to the conditions described below under Creations and Redemptions. The Board has not adopted a policy of monitoring for other frequent trading activity because shares of the Fund are listed for trading on a national securities exchange.

Section 12(d)(1) of the 1940 Act generally restricts investments by investment companies, including foreign and unregistered investment companies, in the securities of other investment companies. For example, a registered investment company (the “Acquired Fund”), such as the Fund, may not knowingly sell or otherwise dispose of any security issued by the Acquired Fund to any investment company (the “Acquiring Fund”) or any company or companies controlled by the Acquiring Fund if, immediately after such sale or disposition: (i) more than 3% of the total outstanding voting stock of the Acquired Fund is owned by the Acquiring Fund and any company or companies controlled by the Acquiring Fund or (ii) more than 10% of the total outstanding voting stock of the Acquired Fund is owned by the Acquiring Fund and other investment companies and companies controlled by them. Although SEC rules may permit registered investment companies and unit investment trusts (“Investing Funds”) that enter into an investment agreement with the Trust to invest in iShares funds beyond the limits set forth in Section 12(d)(1) of the 1940 Act subject to certain terms and conditions, the Fund does not permit such investments. Accordingly, Investing Funds must adhere to the limits set forth in Section 12(d)(1) of the 1940 Act when investing in the Fund. In addition, foreign investment companies are permitted to invest in the Fund only up to the limits set forth in Section 12(d)(1), subject to any applicable SEC no-action relief.

Table of Contents

Share Prices. The trading prices of the Fund’s shares in the secondary market generally differ from the Fund’s daily NAV and are affected by market forces such as the supply of and demand for ETF shares and underlying securities held by the Fund, economic conditions and other factors.

Determination of Net Asset Value. The NAV of the Fund normally is determined once daily Monday through Friday, generally as of the close of regular trading hours of the New York Stock Exchange (“NYSE”) (normally 4:00 p.m., Eastern time) on each day that the NYSE is open for trading, based on prices at the time of closing, provided that any Fund assets or liabilities denominated in currencies other than the U.S. dollar are translated into U.S. dollars at the prevailing market rates on the date of valuation as quoted by one or more data service providers. The NAV of the Fund is calculated by dividing the value of the net assets of the Fund (i.e., the value of its total assets, which includes the value of the Underlying Fund shares in which the Fund invests, less total liabilities) by the total number of outstanding shares of the Fund, generally rounded to the nearest cent.

The value of the securities and other assets and liabilities held by the Fund is determined pursuant to valuation policies and procedures approved by the Board.

Generally, trading in non-U.S. securities and money market instruments is substantially completed each day at various times prior to the close of regular trading hours of the

Table of Contents

NYSE. The values of such securities used in computing the NAV of the Fund are determined as of such times.

Dividends and Distributions

General Policies. Dividends from net investment income, if any, generally are declared and paid at least once a year by the Fund. Distributions of net realized securities gains, if any, generally are declared and paid once a year, but the Trust may make distributions on a more frequent basis for the Fund. The Trust reserves the right to declare special distributions if, in its reasonable discretion, such action is necessary or advisable to preserve its status as a regulated investment company or to avoid imposition of income or excise taxes on undistributed income or realized gains.

Table of Contents

may require beneficial owners to adhere to specific procedures and timetables. If this service is available and used, dividend distributions of both income and realized gains will be automatically reinvested in additional whole shares of the Fund purchased in the secondary market.

Taxes. As with any investment, you should consider how your investment in shares of the Fund will be taxed. The tax information in this Prospectus is provided as general information, based on current law. There is no guarantee that shares of the Fund will receive certain regulatory or accounting treatment. You should consult your own tax professional about the tax consequences of an investment in shares of the Fund.

Taxes on Distributions. Distributions from the Fund’s net investment income, including distributions of income from securities lending and distributions out of the Fund's net short-term capital gains, if any, are taxable to you as ordinary income. The Fund's distributions of net long-term capital gains, if any, in excess of net short-term capital losses are taxable as long-term capital gains, regardless of how long you have held the shares. Long-term capital gains are eligible for taxation at a maximum rate of 15% or 20% for non-corporate shareholders, depending on whether their income exceeds certain threshold amounts. Distributions from the Fund are subject to a 3.8% U.S. federal Medicare contribution tax on “net investment income,” for individuals with incomes exceeding $200,000 ($250,000 if married and filing jointly) and of estates and trusts. In general, your distributions are subject to U.S. federal income tax for the year when they are paid. Certain distributions paid in January, however, may be treated as paid on December 31 of the prior year.

You may lose the ability to use foreign tax credits passed through by the Fund if your Fund shares are loaned out pursuant to a securities lending agreement.

If the Fund's distributions exceed current and accumulated earnings and profits, all or a portion of the distributions made in the taxable year may be recharacterized as a return of capital to shareholders. Distributions in excess of the Fund’s minimum distribution requirements, but not in excess of the Fund’s earnings and profits, will be taxable to shareholders and will not constitute nontaxable returns of capital. A return of capital distribution generally will not be taxable but will reduce the shareholder's cost basis and will result in a higher capital gain or lower capital loss when those shares on which the distribution was received are sold. Once a shareholder's cost basis is reduced to zero, further distributions will be treated as capital gain, if the shareholder holds shares of the Fund as capital assets.

Table of Contents

companies are treated as “non-U.S.”) (and 50% of the total assets of the Fund at the close of the year consists of securities issued by non-U.S. issuers, or, at the close of each quarter, shares of the Underlying Fund), the Fund may “pass through” to you certain non-U.S. income taxes (including withholding taxes) paid by the Fund or the Underlying Fund. This means that you would be considered to have received as an additional dividend your share of such non-U.S. taxes, but you may be entitled to either a corresponding tax deduction in calculating your taxable income, or, subject to certain limitations, a credit in calculating your U.S. federal income tax.

Because the Fund is expected to invest in the Underlying Fund, the Fund’s realized losses on sales of shares of such Underlying Fund may be indefinitely or permanently deferred as “wash sales.” Distributions of short-term capital gains by the Underlying Fund will be recognized as ordinary income by the Fund and would not be offset by the Fund’s capital loss carryforwards, if any. Capital loss carryforwards of the Underlying Fund, if any, would not offset net capital gains of the Fund.

If you are neither a resident nor a citizen of the U.S. or if you are a non-U.S. entity (other than a pass-through entity to the extent owned by U.S. persons), the Fund’s ordinary income dividends (which include distributions of net short-term capital gains) will generally be subject to a 30% U.S. federal withholding tax, unless a lower treaty rate applies provided that withholding tax will generally not apply to any gain or income realized by a non-U.S. shareholder in respect of any distributions of long-term capital gains or upon the sale or other disposition of shares of the Fund.

Separately, a 30% withholding tax is currently imposed on U.S.-source dividends, interest and other income items paid to (i) foreign financial institutions, including non-U.S. investment funds, unless they agree to collect and disclose to the IRS information regarding their direct and indirect U.S. account holders and (ii) certain other foreign entities, unless they certify certain information regarding their direct and indirect U.S. owners. To avoid withholding, foreign financial institutions will need to (i) enter into agreements with the IRS that state that they will provide the IRS information, including the names, addresses and taxpayer identification numbers of direct and indirect U.S. account holders; comply with due diligence procedures with respect to the identification of U.S. accounts; report to the IRS certain information with respect to U.S. accounts maintained, agree to withhold tax on certain payments made to non-compliant foreign financial institutions or to account holders who fail to provide the required information; and determine certain other information concerning their account holders, or (ii) in the event that an applicable intergovernmental agreement and implementing legislation are adopted, provide local revenue authorities with similar account holder information. Other foreign entities may need to report the name, address, and taxpayer identification number of each substantial U.S. owner or provide certifications of no substantial U.S. ownership, unless certain exceptions apply.

Table of Contents

A creation transaction, which is subject to acceptance by the Distributor and the Fund, generally takes place when an Authorized Participant deposits into the Fund a designated portfolio of securities, assets or other positions (a “creation basket”), and an amount of cash (including any cash representing the value of substituted securities, assets or other positions), if any, which together approximate the holdings of the Fund in exchange for a specified number of Creation Units. Similarly, shares can be redeemed only in Creation Units, generally for a designated portfolio of securities, assets or other positions (a “redemption basket”) held by the Fund and an amount of cash (including any portion of such securities for which cash may be substituted). The Fund may, in certain circumstances, offer Creation Units partially or solely for cash. Except when aggregated in Creation Units, shares are not redeemable by the Fund. Creation and redemption baskets may differ and the Fund may accept “custom baskets.” More information regarding custom baskets is contained in the Fund's SAI.

Table of Contents

To the extent the Fund engages in in-kind transactions, the Fund intends to comply with the U.S. federal securities laws in accepting securities for deposit and satisfying redemptions with redemption securities by, among other means, assuring that any securities accepted for deposit and any securities used to satisfy redemption requests will be sold in transactions that would be exempt from registration under the Securities Act of 1933, as amended (the “1933 Act”). Further, an Authorized Participant that is not a “qualified institutional buyer,” as such term is defined in Rule 144A under the 1933 Act, will not be able to receive restricted securities eligible for resale under Rule 144A.

Table of Contents

documents, or if you are currently enrolled in householding and wish to change your householding status.

Distribution

Table of Contents

Financial Highlights

Financial Highlights
(For a share outstanding throughout each period)

	iShares Inflation Hedged Corporate Bond ETF
	Year Ended 10/31/21	Year Ended 10/31/20	Year Ended 10/31/19	Period From 05/08/18^(a) to 10/31/18
Net asset value, beginning of period	$27.66	$26.33	$24.31	$25.00
Net investment income^(b)	0.63	0.71	0.91	0.37
Net realized and unrealized gain (loss)^(c)	2.82	1.36	2.01	(0.70)
Net increase (decrease) from investment operations	3.45	2.07	2.92	(0.33)
Distributions^(d)
From net investment income	(0.66)	(0.74)	(0.90)	(0.36)
Total distributions	(0.66)	(0.74)	(0.90)	(0.36)
Net asset value, end of period	$30.45	$27.66	$26.33	$24.31
Total Return^(e)
Based on net asset value	12.60%	8.00%^(f)	12.26%^(g)	(1.34)%^(h)
Ratios to Average Net Assets
Total expenses⁽ⁱ⁾	0.20%	0.20%	0.20%	0.20%^(j)
Total expenses after fees waived⁽ⁱ⁾	0.05%	0.05%	0.05%	0.05%^(j)
Net investment income	2.14%	2.64%	3.60%	3.04%^(j)
Supplemental Data
Net assets, end of period (000)	$73,073	$17,979	$7,898	$9,725
Portfolio turnover rate^(k)(l)	0%	13%	0%	0%^(h)(m)
^(a) Commencement of operations.
^(b) Based on average shares outstanding.
^(c) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.
^(d) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.
^(e) Where applicable, assumes the reinvestment of distributions.
^(f) Includes payment received from an affiliate, which had no impact on the Fund’s total return.
^(g) Includes payment received from an affiliate, which impacted the Fund’s total return. Excluding the payment from an affiliate, the Fund’s total return would have been 12.22%.
^(h) Not annualized.
⁽ⁱ⁾ The Fund indirectly bears its proportionate share of fees and expenses incurred by the underlying fund in which the Fund is invested (“acquired fund fees and expenses”). This ratio does not include these acquired fund fees and expenses.
^(j) Annualized.
^(k) Portfolio turnover rate excludes in-kind transactions.
^(l) Portfolio turnover rate excludes the portfolio activity of the underlying fund in which the Fund is invested. See the underlying fund's financial highlights for its respective portfolio turnover rates.
^(m) Rounds to less than 1%.

Table of Contents

Index Provider

The Underlying Index was created and is sponsored by BlackRock Index Services, LLC, an affiliated person of the Fund and of BFA. The Index Provider or one or more of its affiliates has entered into a license agreement with the Fund pursuant to which the Fund uses the Underlying Index at no charge.

The Index Provider determines the composition and relative weightings of the securities in the Underlying Index and publishes information regarding the market value of the Underlying Index. The Index Provider will also act as calculation agent for the Underlying Index. The Index Provider and BFA have established policies and procedures designed to prevent non-public information related to the Underlying Index, such as pending changes to the Underlying Index, from being used or disseminated in an improper manner, including to affiliates of the Fund. The Fund is not entitled to obtain non-public information about the Underlying Index prior to dissemination of such changes. Furthermore, the Index Provider and BFA have established policies and procedures designed to prevent improper use and dissemination of non-public information about the Fund's portfolio strategies.

The Index Provider has no obligation to take the needs of the Fund or its shareholders into consideration in establishing and maintaining the Underlying Index. The Index Provider does not guarantee the accuracy, completeness, or performance of the Underlying Index or the data included therein and shall have no liability in connection with the Underlying Index or Underlying Index calculation.

Table of Contents

Disclaimers

The Fund is not sponsored, endorsed, sold or promoted by BlackRock Index Services, LLC. BlackRock Index Services, LLC makes no representation or warranty, express or implied, to the owners of the Fund or any member of the public regarding the advisability of investing in funds generally or in the Fund particularly or the ability of the Underlying Index to track general stock market performance. BlackRock Index Services, LLC is the licensor of certain trademarks, service marks and trade names of BlackRock Index Services, LLC and of the Underlying Index, which is determined, composed and calculated by BlackRock Index Services, LLC without regard to the issuer of the Fund or the Fund. BlackRock Index Services, LLC has no obligation to take the needs of the issuer of the Fund or the owners of the Fund into consideration in determining, composing or calculating the Underlying Index. BlackRock Index Services, LLC is not responsible for and has not participated in the determination of the timing of, prices of, or quantities of shares of the Fund to be issued or in the determination or calculation of the equation by which the shares are redeemable. BlackRock Index Services, LLC has no obligation or liability to owners of the Fund in connection with the administration, marketing or trading of the Fund.

ALTHOUGH BLACKROCK INDEX SERVICES, LLC SHALL OBTAIN INFORMATION FOR INCLUSION IN OR FOR USE IN THE CALCULATION OF THE INDEXES FROM SOURCES THAT BLACKROCK INDEX SERVICES, LLC CONSIDERS RELIABLE, BLACKROCK INDEX SERVICES, LLC DOES NOT GUARANTEE THE ACCURACY AND/OR THE COMPLETENESS OF THE INDEXES OR ANY DATA INCLUDED THEREIN. BLACKROCK INDEX SERVICES, LLC DOES NOT MAKE ANY WARRANTY, EXPRESS OR IMPLIED, AS TO RESULTS TO BE OBTAINED BY LICENSEE, LICENSEE’S CUSTOMERS AND COUNTERPARTIES, OWNERS OF THE FUND, OR ANY OTHER PERSON OR ENTITY FROM THE USE OF THE INDEXES OR ANY DATA INCLUDED THEREIN IN CONNECTION WITH THE RIGHTS LICENSED HEREUNDER OR FOR ANY OTHER USE. BLACKROCK INDEX SERVICES, LLC MAKES NO EXPRESS OR IMPLIED WARRANTIES, AND BLACKROCK INDEX SERVICES, LLC HEREBY EXPRESSLY DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WITH RESPECT TO THE INDEXES OR ANY DATA INCLUDED THEREIN. WITHOUT LIMITING ANY OF THE FOREGOING, IN NO EVENT SHALL BLACKROCK INDEX SERVICES, LLC HAVE ANY LIABILITY FOR ANY DIRECT, INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL OR ANY OTHER DAMAGES (INCLUDING LOST PROFITS) EVEN IF NOTIFIED OF THE POSSIBILITY OF SUCH DAMAGES.

Table of Contents

of shares of the Fund to be issued, nor in the determination or calculation of the equation by which the shares are redeemable. Cboe BZX has no obligation or liability to owners of the shares of the Fund in connection with the administration, marketing or trading of the shares of the Fund.

Without limiting any of the foregoing, in no event shall Cboe BZX have any liability for any direct, indirect, special, punitive, consequential or any other damages (including lost profits) even if notified of the possibility of such damages.

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

Want to know more?

iShares.com | 1-800-474-2737

If you have any questions about the Trust or shares of the Fund or you wish to obtain the SAI, Semi-Annual or Annual Report free of charge, please:

Call:	1-800-iShares or 1-800-474-2737 (toll free) Monday through Friday, 8:30 a.m. to 6:30 p.m. (Eastern time)
Email:	iSharesETFs@blackrock.com
Write:	c/o BlackRock Investments, LLC 1 University Square Drive, Princeton, NJ 08540

Investment Company Act File No.: 811-22649

IS-P-LQDI-0322

	March 1, 2022

2022 Prospectus

iShares U.S. ETF Trust

•	iShares Interest Rate Hedged Corporate Bond ETF \| LQDH \| NYSE ARCA

Table of Contents

Fund Overview	S-1
More Information About the Fund	1
A Further Discussion of Principal Risks	2
A Further Discussion of Other Risks	18
Portfolio Holdings Information	23
A Further Discussion of Principal Investment Strategies	23
Management	24
Shareholder Information	27
Distribution	35
Financial Highlights	36
Index Provider	37
Disclaimers	38

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

iSHARES^® INTEREST RATE HEDGED CORPORATE BOND ETF

Ticker: LQDH

Stock Exchange: NYSE Arca

Investment Objective

The iShares Interest Rate Hedged Corporate Bond ETF (the “Fund”) seeks to track the investment results of an index designed to mitigate the interest rate risk of a portfolio composed of U.S. dollar-denominated, investment grade corporate bonds.

Fees and Expenses

The following table describes the fees and expenses that you will incur if you buy, hold and sell shares of the Fund. The investment advisory agreement between iShares U.S. ETF Trust (the “Trust”) and BlackRock Fund Advisors (“BFA”) (the “Investment Advisory Agreement”) provides that BFA will pay all operating expenses of the Fund, except: (i) the management fees, (ii) interest expenses, (iii) taxes, (iv) expenses incurred with respect to the acquisition and disposition of portfolio securities and the execution of portfolio transactions, including brokerage commissions, (v) distribution fees or expenses, and (vi) litigation expenses and extraordinary expenses. The Fund may incur “Acquired Fund Fees and Expenses.” Acquired Fund Fees and Expenses reflect the Fund's pro rata share of the fees and expenses incurred by investing in other investment companies. The impact of Acquired Fund Fees and Expenses is included in the total returns of the Fund. Acquired Fund Fees and Expenses are not included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Fund's prospectus (the “Prospectus”). BFA, the investment adviser to the Fund, has contractually agreed to waive a portion of its management fees so that the Fund’s total annual fund operating expenses after fee waiver are equal to the Acquired Fund Fees and Expenses attributable to the Fund’s investment in the iShares iBoxx $ Investment Grade Corporate Bond ETF (“LQD” or the “Underlying Fund”), after taking into account any fee waivers by LQD, plus 0.10% through February 28, 2027. The contractual waiver may be terminated prior to February 28, 2027 only upon written agreement of the Trust and BFA.

You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Annual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investments)
Management Fees	Distribution and Service (12b-1) Fees	Other Expenses¹	Acquired Fund Fees and Expenses	Total Annual Fund Operating Expenses	Fee Waiver	Total Annual Fund Operating Expenses After Fee Waiver
0.30%	None	0.00%	0.14%	0.44%	(0.20)%	0.24%

¹	The amount rounded to 0.00%.

S-1

Table of Contents

1 Year		3 Years		5 Years		10 Years
$25		$77		$135		$446

Portfolio Turnover. The Fund or the Underlying Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate for the Fund or the Underlying Fund may indicate higher transaction costs and may cause the Fund or the Underlying Fund to incur increased expenses. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example (except costs to the Underlying Fund included as part of Acquired Fund Fees and Expenses), affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 5% of the average value of its portfolio. To the extent the Underlying Fund incurs costs from high portfolio turnover, such costs may have a negative effect on the performance of the Fund.

Principal Investment Strategies

The Fund seeks to track the investment results of the BlackRock Interest Rate Hedged Corporate Bond Index (the “Underlying Index”), which is designed to minimize the interest rate risk exposure of a portfolio composed of U.S. dollar-denominated, investment-grade bonds, represented in the

Underlying Index by the Underlying Fund, by including a series of up to 10 interest rate swap contracts with different maturities (as determined by BlackRock Index Services, LLC (the “Index Provider”)). As of October 31, 2021, the Underlying Index includes approximately 12 components, and the Underlying Fund includes approximately 2,455 components. The Fund invests in U.S. dollar-denominated, investment-grade bonds primarily through its investment in the Underlying Fund. To be included in the Underlying Fund, bonds must have: (i) at least three years to maturity; and (ii) at least three years and 6 months to maturity for new index insertions. The Fund seeks to track the interest rate hedging component of the Underlying Index primarily through the use of positions in interest rate swaps (i.e., contracts in which the Fund makes fixed-rate payments while receiving floating-rate payments based on a reference rate). The different maturities and weights of the swap contracts included in the Underlying Index are intended to hedge the portfolio’s duration exposure (i.e., sensitivity to changes in interest rates) at key points on the yield curve, as determined by the Index Provider. The Underlying Index includes a fixed number of shares (to be adjusted in the event of any stock splits) of the Underlying Fund, and the Index Provider rebalances the weights of the swap contracts included in the Underlying Index daily. On a monthly basis, the Index Provider will add new swap contracts to the Underlying Index and remove the previous month’s swap contracts. Finally, the Index Provider includes a 5% cash position in the

S-2

Table of Contents

Underlying Index in order to represent the collateral that is required to be kept available for the margin requirements for the swap contracts.

The Fund may also invest in other interest rate futures contracts, including but not limited to, U.S. Treasuries, Eurodollar and Federal Funds futures. The Fund’s interest rate swap and futures positions are not intended to mitigate credit risk or other factors influencing the price of investment-grade corporate bonds, which may have a greater impact than interest rates.

The CFTC has adopted certain requirements that subject registered investment companies and their advisers to regulation by the CFTC if a registered investment company invests more than a prescribed level of its net asset value in CFTC-regulated futures, options and swaps, or if a registered investment company markets itself as providing investment exposure to such instruments. Due to the Fund’s potential use of CFTC-regulated futures, options and swaps above the prescribed levels, it is considered a “commodity pool” and BFA is considered a “commodity pool operator” with respect to the Fund under the Commodity Exchange Act (“CEA”).

positions when markets decline or appear overvalued.

The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of the collateral received).

The Underlying Index is sponsored by the Index Provider, an affiliated person of the Fund and of BFA, the Fund’s investment adviser. The Index Provider determines the composition and relative

S-3

Table of Contents

weightings of the securities in the Underlying Index and publishes information regarding the market value of the Underlying Index.

Summary of Principal Risks

directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting.

Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Underlying Fund may “call” or repay the security before its stated maturity, and the Underlying Fund may have to reinvest the proceeds in securities with lower yields, which would result in a decline in the Fund's or Underlying Fund's income, or in securities with greater risks or with other less favorable features.

S-4

Table of Contents

National Futures Association (“NFA”). The regulatory requirements governing the use of commodity futures, options on commodity futures, certain swaps or certain other investments could change at any time.

Credit Risk. Debt issuers and other counterparties may be unable or unwilling to make timely interest and/or principal payments when due or otherwise honor their obligations. Changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may also adversely affect the value of the Fund’s or Underlying Fund's investment in that issuer. The degree of credit risk depends on an issuer's or counterparty's financial condition and on the terms of an obligation.

hedging counterparties to the Fund or the issuers of securities in which the Fund or the Underlying Fund invests have the ability to cause disruptions, negatively impact the Fund’s business operations and/or potentially result in financial losses to the Fund and its shareholders. While the Fund has established business continuity plans and risk management systems seeking to address system breaches or failures, there are inherent limitations in such plans and systems. Furthermore, the Fund cannot control the cybersecurity plans and systems of the Fund’s Index Provider and other service providers, market makers, Authorized Participants, hedging counterparties to the Fund or issuers of securities in which the Fund or the Underlying Fund invests.

S-5

Table of Contents

the Fund or Underlying Fund to sell or otherwise close a derivatives position could expose the Fund or Underlying Fund to losses and could make derivatives more difficult for the Fund or Underlying Fund to value accurately. The Fund or Underlying Fund could also suffer losses related to its derivatives positions as a result of unanticipated market movements, or movements between the time of periodic reallocations of Fund or Underlying Fund assets, which losses are potentially unlimited. Certain derivatives may give rise to a form of leverage and may expose the Fund or Underlying Fund to greater risk and increase its costs. The impact of U.S. and global regulation of derivatives may make derivatives more costly, may limit the availability of derivatives, may delay or restrict the exercise by the Fund or Underlying Fund of termination rights or remedies upon a counterparty default under derivatives held by the Fund or Underlying Fund (which could result in losses), or may otherwise adversely affect the value or performance of derivatives.

Financials Sector Risk. Performance of companies in the financials sector may be adversely impacted by many factors, including, among others, changes in government regulations, economic conditions, and interest rates, credit rating downgrades, and decreased liquidity in credit markets. The extent to which the Fund or the Underlying Fund may invest in a company that engages in securities-related activities or banking is limited by applicable law. The impact of changes in capital requirements and recent or future regulation of any individual financial company, or of the financials sector as a whole, cannot be predicted. In recent

years, cyberattacks and technology malfunctions and failures have become increasingly frequent in this sector and have caused significant losses to companies in this sector, which may negatively impact the Fund.

Geographic Risk. A natural disaster could occur in a geographic region in which the Fund or Underlying Fund invests, which could adversely affect the economy or the business operations of companies in the specific geographic region, causing an adverse impact on the Fund's or the Underlying Fund's investments in, or which are exposed to, the affected region.

Hedging Risk. The Fund seeks to mitigate the potential impact of interest rates on the performance of investment-grade bonds by entering into positions in U.S. Treasury and other futures and interest rate swaps. The Fund’s Treasury and other futures positions are not intended to mitigate credit risk or other factors influencing the price of investment-grade bonds, which may have a greater impact than interest rates. There is no guarantee that the Fund’s Treasury and other futures and interest rate swap positions will completely eliminate the interest rate risk of the long positions in investment-grade bonds. In addition, when interest rates fall, long–only investment-grade bond investments will perform better than the Fund’s investments. In certain falling interest rate environments, the Fund’s hedging strategy could result in disproportionately larger losses in the Treasury and other futures and interest rate swap positions as compared to gains in the long investment-grade bond positions attributable to interest rate changes. There is no guarantee the Fund will have positive returns, even in environments of sharply rising interest

S-6

Table of Contents

rates in which the Fund’s Treasury and other futures and interest rate swap positions might be expected to mitigate the effects of such rises. The Fund will incur expenses when entering into Treasury and other futures and interest rate swap positions.

Income Risk. The Fund's income may decline when yields fall. This decline can occur because the Underlying Fund may subsequently invest in lower-yielding bonds as bonds in its portfolio mature, are near maturity or are called, bonds in the Underlying Fund's index are substituted, or the Underlying Fund otherwise needs to purchase additional bonds.

Index-Related Risk. There is no guarantee that the Fund’s investment results will have a high degree of correlation to those of the Underlying Index or that the Fund will achieve its

investment objective. Market disruptions and regulatory restrictions could have an adverse effect on the Fund’s ability to adjust its exposure to the required levels in order to track the Underlying Index. Errors in index data, index computations or the construction of the Underlying Index in accordance with its methodology may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, which may have an adverse impact on the Fund and its shareholders. Because the Index Provider is relatively new to the creation of securities indexes, there may be a greater risk that index errors will not be detected as quickly as they might be in the case of an index maintained by a long-standing index provider. Unusual market conditions may cause the Index Provider to postpone a scheduled rebalance, which could cause the Underlying Index to vary from its normal or expected composition.

S-7

Table of Contents

Interest Rate Risk. During periods of very low or negative interest rates, the Fund may be unable to maintain positive returns or pay dividends to Fund shareholders. Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, result in heightened market volatility and detract from the Fund’s performance to the extent the Fund is exposed to such interest rates. Additionally, under certain market conditions in which interest rates are low and the market prices for portfolio securities have increased, the Fund may have a very low or even negative yield. A low or negative yield would cause the Fund to lose money in certain conditions and over certain time periods. An increase in interest rates will generally cause the value of securities held by the Fund or the Underlying Fund to decline, may lead to heightened volatility in the fixed-income markets and may adversely affect the liquidity of certain fixed-income investments, including those held by the Fund or the Underlying Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. The historically low interest rate environment heightens the risks associated with rising interest rates.

Interest Rate Swap Risk. Interest rate swaps are subject to risks applicable to swaps generally, including the risk that a counterparty fails to meet its obligations and the risk that the Fund is

not able to liquidate such swap in a timely manner or at all, which could result in losses to the Fund. Because the Fund invests in swaps that are subject to central clearing, these swaps are subject to the risk that a central clearinghouse will go into bankruptcy or become non-operational, and sometimes involve increased transaction costs. Counterparties to OTC swaps are not subject to these risks. An interest rate swap may fail to perform as intended and may not offset adverse changes in interest rates fully or at all. An interest rate swap may also reduce the Fund’s gains due to favorable changes in interest rates and result in losses to the Fund. Counterparties to interest rate swaps are subject to manipulation in the marketplace of the reference benchmark rate, which may affect the utility of the swap as a hedge.

Investment in the Underlying Fund Risk. The Fund expects to invest a substantial portion of its assets in the Underlying Fund, so the Fund’s investment performance is likely to be directly related to the performance of the Underlying Fund. The Fund’s NAV will change with changes in the value of the Underlying Fund and other securities and instruments in which the Fund invests based on their market valuations. An investment in the Fund will entail more costs and expenses than a direct investment in the Underlying Fund.

S-8

Table of Contents

Through its investment in the Underlying Fund, the Fund is exposed to Management Risk, Market Risk, and Market Trading Risk, among other risks.

Issuer Risk. The performance of the Fund depends on the performance of individual instruments to which the Fund or the Underlying Fund has exposure. The Fund may be adversely affected if an issuer of underlying securities held by the Fund or Underlying Fund is unable or unwilling to repay principal or interest when due. Changes in the financial condition or credit rating of an issuer of those securities or counterparty on other instruments may cause the value of the securities or instruments to decline.

Market Risk. The Fund and the Underlying Fund could lose money over short periods due to short-term market movements and over longer periods during more prolonged market downturns. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund, the Underlying Fund and their investments and could result in increased premiums or discounts to the Fund’s or Underlying Fund's NAV.

Market Trading Risk. The Fund and the Underlying Fund face numerous market trading risks, including the potential

lack of an active market for their shares, losses from trading in secondary markets, periods of high volatility and disruptions in the creation/redemption process. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S AND THE UNDERLYING FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

S-9

Table of Contents

Risk of Investing in Developed Countries. The Fund’s and the Underlying Fund's investment in developed country issuers may subject the Fund to regulatory, political, currency, security, economic and other risks associated with developed countries. Developed countries tend to represent a significant portion of the global economy and have generally experienced slower economic growth than some less developed countries. Certain developed countries have experienced security concerns, such as terrorism and strained international relations. Incidents involving a country’s or region’s security may cause uncertainty in its markets and may adversely affect its economy and the Fund’s or the Underlying Fund's investments. In addition, developed countries may be adversely impacted by changes to the economic conditions of certain key trading partners, regulatory burdens, debt burdens and the price or availability of certain commodities.

Risk of Swap Agreements. A swap is a two-party contract that generally obligates each counterparty to

exchange periodic payments based on a pre-determined underlying investment or notional amount and to exchange collateral to secure the obligations of each counterparty. Swaps may be leveraged and are subject to counterparty risk, credit risk and pricing risk. Swaps may be subject to illiquidity risk, and it may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses.

S-10

Table of Contents

could be an increase (or decrease) in the amount of taxable dividends paid by the Fund. Income from swaps is generally taxable. In addition, the tax treatment of certain derivatives, such as swaps, is unsettled and may be subject to future legislation, regulation or administrative pronouncements issued by the U.S. Internal Revenue Service (“IRS”). Because the Fund invests in the Underlying Fund, the Fund’s realized losses on sales of shares of the Underlying Fund may be indefinitely or permanently deferred as “wash sales.” Distributions of short-term capital gains by the Underlying Fund will be recognized as ordinary income by the Fund and would not be offset by the Fund’s capital loss carryforwards, if any. Capital loss carryforwards of the Underlying Fund, if any, would not offset net capital gains of the Fund. Each of these effects is caused by the Fund’s investment in the Underlying Fund and may result in distributions to Fund shareholders being of higher magnitude and less likely to qualify for lower capital gain tax rates than if the Fund were to invest directly in the securities and other instruments composing its portfolio.

respectively), transaction costs incurred by the Fund, the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be heightened during times of increased market volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX EXCHANGE TRADED FUNDS (“ETFs”) THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN SWAP CONTRACTS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

S-11

Table of Contents

Fund shares on days when the Fund or the Underlying Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund or the Underlying Fund not fair-valued

securities or used a different valuation methodology. The Fund’s or the Underlying Fund's ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

Performance Information

The bar chart and table that follow show how the Fund has performed on a calendar year basis and provide some indication of the risks of investing in the Fund by showing how the Fund’s average annual returns for 1 and 5 years and since inception compare with those of a broad measure of market performance. Both assume that all dividends and distributions have been reinvested in the Fund. Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. If BFA had not waived certain Fund fees during certain periods, the Fund's returns would have been lower. Effective December 1, 2021, the Fund is no longer actively managed. The performance information below prior to December 1, 2021 is based on the performance of the Fund when it was actively managed by BFA using an investment strategy substantially similar to the methodology of the Underlying Index.

Year by Year Returns (Years Ended December 31)

The best calendar quarter return during the periods shown above was 8.68% in the 2nd quarter of 2020; the worst was -12.96% in the 1st quarter of 2020.

Updated performance information, including the Fund’s current NAV, may be obtained by visiting our website at www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).

S-12

Table of Contents

Average Annual Total Returns

(for the periods ended December 31, 2021)

	One Year	Five Years	Since Fund Inception
(Inception Date: 5/27/2014)
Return Before Taxes	1.94%	3.32%	2.26%
Return After Taxes on Distributions¹	1.26%	2.16%	1.08%
Return After Taxes on Distributions and Sale of Fund Shares¹	1.15%	2.07%	1.21%
Markit iBoxx USD Liquid Investment Grade Interest Rate Hedged Swaps Index^2,3 (Index returns do not reflect deductions for fees, expenses, or taxes)	2.31%	3.33%	2.19%
BlackRock Interest Rate Hedged Corporate Bond Index³ (Index returns do not reflect deductions for fees, expenses, or taxes)	N/A	N/A	N/A

²	The Markit iBoxx USD Liquid Investment Grade Interest Rate Hedged Swaps Index is an unmanaged index that is designed to reflect the duration hedged performance of U.S. dollar-denominated investment-grade corporate debt.
³	Effective December 1, 2021, the fund is no longer actively managed and the Fund's new Underlying Index is the BlackRock Interest Rate Hedged Corporate Bond Index. The inception date of the BlackRock Interest Rate Hedged Corporate Bond Index is October 29, 2021.

S-13

Table of Contents

Management

Investment Adviser. BlackRock Fund Advisors.

Purchase and Sale of Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

S-14

Table of Contents

More Information About the Fund

Effective December 1, 2021, the Fund is no longer actively managed and the Fund's new Underlying Index is the BlackRock Interest Rate Hedged Corporate Bond Index.

The Fund invests in a particular segment of the financial market and seeks to track the performance of an interest rate hedged index that is not representative of the market as a whole. The Fund is designed to be used as part of broader asset allocation strategies. Accordingly, an investment in the Fund should not constitute a complete investment program.

“Tracking error” is the divergence of the Fund's performance from that of the Underlying Index. Because the Fund uses a representative sampling indexing strategy,

Table of Contents

An investment in the Fund is not a bank deposit and it is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, BFA or any of its affiliates.

The Fund's investment objective and the Underlying Index may be changed without shareholder approval.

A Further Discussion of Principal Risks

The Fund is subject to various risks, including the principal risks noted below, any of which may adversely affect the Fund’s NAV, trading price, yield, total return and ability to meet its investment objective. The Fund may be exposed to these risks directly or indirectly through the Fund's investments in the Underlying Fund. You could lose all or part of your investment in the Fund, and the Fund could underperform other investments. The order of the below risk factors does not indicate the significance of any particular risk factor.

Authorized Participant Concentration Risk. Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem Creation Units, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting. Authorized Participant concentration risk may be heightened because ETFs, such as the Fund, that invest in securities issued by non-U.S. issuers or other securities or instruments that are less widely traded often involve greater settlement and operational issues and capital costs for Authorized Participants, which may limit the availability of Authorized Participants.

Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Underlying Fund may “call” or repay the security before its stated maturity, and the

Table of Contents

Underlying Fund may have to reinvest the proceeds in securities with lower yields, which would result in a decline in the Fund’s income, or in securities with greater risks or with other less favorable features.

Cash Management Risk. To the extent the Fund holds cash, the Fund will earn reduced income (if any) on the cash and will be subject to the credit risk of the depository institution holding the cash and any fees imposed on large cash balances. If a significant amount of the Fund’s assets are invested in cash and cash equivalents, it will be more difficult for the Fund to achieve its investment objective. The Fund may underperform other funds that do not similarly invest in cash and cash equivalents for investment purposes and/or to collateralize derivative instruments.

Commodity Regulatory Risk. The Fund is deemed a “commodity pool ” and BFA is considered a “commodity pool operator” with respect to the Fund under the CEA. BFA is therefore subject to regulation by the SEC and the CFTC. BFA is also subject to regulation by the NFA. The regulatory requirements governing the use of commodity futures, options on commodity futures, certain swaps or certain other investments could change at any time.

Concentration Risk. The Fund may be susceptible to an increased risk of loss, including losses due to adverse events that affect the Fund’s investments more than the market as a whole, to the extent that the Fund's or the Underlying Fund's investments are concentrated in the securities and/or other assets of a particular issuer or issuers, representing a particular country, group of countries, region, market, industry, group of industries, sector, market segment or asset class. The Fund may be more adversely affected by the underperformance of those securities and/or other assets, may experience increased price volatility and may be more susceptible to adverse economic, market, political or regulatory occurrences affecting those securities and/or other assets than a fund that does not concentrate its investments.

Credit Risk. Credit risk is the risk that the issuer or guarantor of a debt instrument or the counterparty to a derivatives contract, repurchase agreement or loan of portfolio

Table of Contents

securities will be unable or unwilling to make its timely interest and/or principal payments when due or otherwise honor its obligations. There are varying degrees of credit risk, depending on an issuer’s or counterparty’s financial condition and on the terms of an obligation, which may be reflected in the issuer’s or counterparty’s credit rating. There is the chance that the Fund’s or the Underlying Fund's portfolio holdings will have their credit ratings downgraded or will default (i.e., fail to make scheduled interest or principal payments), or that the market’s perception of an issuer’s creditworthiness may worsen, potentially reducing the Fund’s or the Underlying Fund's income level or share price, which may adversely affect the value of the Fund. The Fund’s hedging strategy does not seek to mitigate credit risk.

Cybersecurity Risk. With the increased use of technologies such as the internet to conduct business, the Fund, the Underlying Fund, Authorized Participants, service providers and the relevant listing exchange are susceptible to operational, information security and related “cyber” risks both directly and through their service providers. Similar types of cybersecurity risks are also present for issuers of securities in which the Fund or the Underlying Fund invest, which could result in material adverse consequences for such issuers and may cause the Fund’s or the Underlying Fund's investment in such issuers to lose value. In general, cyber incidents can result from deliberate attacks or unintentional events. Cyber incidents include, but are not limited to, gaining unauthorized access to digital systems (e.g., through “hacking” or malicious software coding) for purposes of misappropriating assets or sensitive information, corrupting data, or causing operational disruption. Cyberattacks may also be carried out in a manner that does not require gaining unauthorized access, such as causing denial-of-service attacks on websites (i.e., efforts to make network services unavailable to intended users). Recently, geopolitical tensions may have increased the scale and sophistication of deliberate attacks, particularly those from nation-states or from entities with nation-state backing.

Cybersecurity failures by, or breaches of, the systems of the Fund's or the Underlying Fund's adviser, distributor and other service providers (including, but not limited to, index and benchmark providers, fund accountants, custodians, transfer agents and administrators), market makers, Authorized Participants or the issuers of securities in which the Fund or the Underlying Fund invest have the ability to cause disruptions and impact business operations, potentially resulting in: financial losses, interference with the Fund’s or the Underlying Fund's ability to calculate its NAV, disclosure of confidential trading information, impediments to trading, submission of erroneous trades or erroneous creation or redemption orders, the inability of the Fund, the Underlying Fund or their service providers to transact business, violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, reimbursement or other compensation costs, or additional compliance costs. In addition, cyberattacks may render records of Fund assets and transactions, shareholder ownership of Fund shares, and other data integral to the functioning of the Fund or the Underlying Fund inaccessible, inaccurate or incomplete. Substantial costs may be incurred by the Fund or the Underlying Fund in order to resolve or prevent cyber incidents in the future. While the Fund and the Underlying Fund have established

Table of Contents

business continuity plans in the event of, and risk management systems to prevent, such cyber incidents, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, that prevention and remediation efforts will not be successful or that cyberattacks will go undetected. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund or Underlying Fund, issuers in which the Fund or Underlying Fund invests, the Index Provider, hedging counterparties to the Fund or Underlying Fund, market makers or Authorized Participants. The Fund and its shareholders could be negatively impacted as a result.

Financials Sector Risk. Companies in the financials sector of an economy are subject to extensive governmental regulation and intervention, which may adversely affect the scope of their activities, the prices they can charge, the amount of capital they must maintain and, potentially, their size. The extent to which the Fund or the Underlying Fund may invest in a company that engages in securities-related activities or banking is limited by applicable law. Governmental regulation may change frequently and may have significant adverse consequences for companies in the financials sector, including effects not intended by such regulation. Recently enacted legislation in the U.S. has relaxed capital requirements and other regulatory burdens on certain U.S. banks. While the effect of the legislation may benefit certain companies in the financials sector, increased risk taking by affected banks may also result in greater overall risk in the U.S. and global financials sector. The impact of changes in capital requirements, or recent or future regulation in various countries, on any individual

Table of Contents

financial company or on the financials sector as a whole cannot be predicted.

The Fund seeks to mitigate the potential impact of rising interest rates on the performance of investment-grade bonds by entering into positions in U.S. Treasury futures and interest rate swaps. The Treasury and other futures positions are not intended to mitigate credit risk or certain other factors influencing the price of investment-grade bonds, which may have a greater impact than rising or falling interest rates. There is no guarantee that the futures and interest rate swap positions will achieve the targeted reduction in the interest rate risk of the long positions in investment-grade bonds. In addition, when interest rates fall, investors may be better

Table of Contents

off in a long–only investment-grade investment than with an investment in the Fund. Performance of the Fund could be particularly poor in risk-averse, flight-to-quality environments when it is common for investment-grade bonds to decline in value. Furthermore, the Fund may be more volatile than a long-only investment in investment-grade bonds. The Fund may contain a significant allocation to callable investment-grade bonds, which are subject to call risk and prepayment risk (see Call Risk and Prepayment Risk); callable bonds may have lower sensitivity to interest rate declines than non-callable bonds or U.S. Treasury futures. In certain falling interest rate environments, this could result in disproportionately larger losses in the futures and interest rate swap positions as compared to gains in the long investment-grade bond position attributable to interest rate changes. There is no guarantee the Fund will have positive returns, even in environments of sharply rising interest rates in which the Fund’s futures and interest rate swap positions might be expected to mitigate the effects of such rises. The Fund will incur expenses when entering into futures and interest rate swap positions. The use of hedging may result in certain adverse tax consequences, as noted in the Taxes section of the Prospectus.

Income Risk. The Fund’s income may decline if yields fall because the Fund or the Underlying Fund may hold a significant portion of short duration securities and/or

Table of Contents

securities that have floating or variable interest rates. The Fund’s income may decline because the Fund or the Underlying Fund invests in lower yielding bonds as bonds in its portfolio mature, are near maturity or are called, or when the Fund or the Underlying Fund needs to purchase additional bonds. Hedges entered into by the Fund may not be effective to hedge interest rate risk and, in this case, the income of the Fund may fall because both the securities of the Fund drop in value and the value of the futures and swaps held by the Fund decline.

Unusual market conditions may cause the Index Provider to postpone a scheduled rebalance to the Underlying Index, which could cause the Underlying Index to vary from its normal or expected composition. The postponement of a scheduled rebalance in a time of market volatility could mean that constituents of the Underlying Index that would otherwise be removed at rebalance due to changes in market value, issuer credit ratings, or other reasons may remain, causing the performance and constituents of the Underlying Index to vary from those expected under normal conditions. Apart from scheduled rebalances, the Index Provider or its agents may carry out additional ad hoc rebalances to the Underlying Index due to reaching certain weighting constraints, unusual market conditions or corporate events or, for example, to correct an error in the selection of index constituents. When the Underlying Index is rebalanced and the Fund in turn rebalances its portfolio to attempt to increase the correlation between the Fund’s portfolio and the Underlying Index, any transaction

Table of Contents

costs and market exposure arising from such portfolio rebalancing will be borne directly by the Fund and its shareholders. Therefore, errors and additional ad hoc rebalances carried out by the Index Provider or its agents to the Underlying Index may increase the costs to and the tracking error risk of the Fund.

■	General Impact. This outbreak has resulted in travel restrictions, closed international borders, enhanced health screenings at ports of entry and elsewhere, disruption of, and delays in, healthcare service preparation and delivery, prolonged quarantines, cancellations, supply chain disruptions, lower consumer demand, temporary and permanent closures of stores, restaurants and other commercial establishments, layoffs, defaults and other significant economic impacts, as well as general concern and uncertainty.
■	Market Volatility. The outbreak has also resulted in extreme volatility, severe losses, and disruptions in markets which can adversely impact the Fund and its investments, including impairing hedging activity to the extent the Fund engages in such activity, as expected correlations between related markets or instruments may no longer apply. In addition, to the extent the Fund invests in short-term instruments that have negative yields, the Fund’s value may be impaired as a result. Certain issuers of equity securities have cancelled or announced the suspension of dividends. The outbreak has, and may continue to, negatively affect the credit ratings of some fixed-income securities and their issuers.
■	Market Closures. Certain local markets have been or may be subject to closures, and there can be no assurance that trading will continue in any local markets in which the Fund or the Underlying Fund may invest, when any resumption of trading will occur or, once such markets resume trading, whether they will face further closures. Any suspension of trading in markets in which the Fund or the Underlying Fund invests will have an impact on the Fund or Underlying Fund and its investments and will impact the Fund’s or the Underlying Fund's ability to purchase or sell securities in such markets.
■	Operational Risk. The outbreak could also impair the information technology and other operational systems upon which the Fund’s service providers, including BFA, rely, and could otherwise disrupt the ability of employees of the Fund's service providers to perform critical tasks relating to the Fund, for example, due to the service providers’ employees performing tasks in alternate locations than under normal operating conditions or the illness of certain employees of the Fund's service providers.
■	Governmental Interventions. Governmental and quasi-governmental authorities and

Table of Contents

regulators throughout the world have responded to the outbreak and the resulting economic disruptions with a variety of fiscal and monetary policy changes, including direct capital infusions into companies and other issuers, new monetary policy tools, and lower interest rates. An unexpected or sudden reversal of these policies, or the ineffectiveness of such policies, is likely to increase market volatility, which could adversely affect the Fund’s investments.

■

Pre-Existing Conditions. Public health crises caused by the outbreak may exacerbate other pre-existing political, social and economic risks in certain countries or globally, which could adversely affect the Fund and its investments and could result in increased premiums or discounts to the Fund's NAV.

Other infectious illness outbreaks that may arise in the future could have similar or other unforeseen effects.

Interest Rate Risk. If interest rates rise, the value of fixed-income securities or other instruments held by the Fund or the Underlying Fund would likely decrease. A measure investors commonly use to determine this price sensitivity is called duration. Fixed-income securities with longer durations tend to be more sensitive to interest rate changes, usually making their prices more volatile than those of securities with shorter durations. To the extent the Fund or the Underlying Fund invests a substantial portion of its assets in fixed-income securities with longer duration, rising interest rates may cause the value of the Fund's or the Underlying Fund's investments to decline significantly, which would adversely affect the value of the Fund. An increase in interest rates may lead to heightened volatility in the fixed-income markets and adversely affect certain fixed-income investments, including those held by the Fund or the Underlying Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. In addition, decreases in fixed income dealer market-making capacity may lead to lower trading volume, heightened volatility, wider bid-ask spreads and less transparent pricing in certain fixed-income markets.

The historically low interest rate environment was created in part by the world’s major central banks keeping their overnight policy interest rates at, near or below zero percent and implementing monetary policy facilities, such as asset purchase programs, to anchor longer-term interest rates below historical levels. During periods of very low or negative interest rates, the Fund may be unable to maintain positive returns or pay dividends to Fund shareholders. Certain countries have recently experienced negative interest rates on certain fixed-income instruments. Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, result in heightened market volatility and detract from the Fund’s performance to the extent the Fund is exposed to such interest rates. Additionally, under certain market conditions in which interest rates are set at low levels and the market prices of portfolio securities have increased, the Fund or the Underlying Fund may have a very low or even negative yield. A low or negative yield would cause the Fund or the Underlying Fund to lose money in certain conditions and over certain time periods. Central banks may increase their short-term policy rates

Table of Contents

or begin phasing out, or “tapering,” accommodative monetary policy facilities in the future. The timing, coordination, magnitude and effect of such policy changes on various markets are uncertain, and such changes in monetary policy may adversely affect the value of the Fund’s investments.

Investment in the Underlying Fund Risk. The Fund expects to invest a substantial portion of its assets in the Underlying Fund, so the Fund’s investment performance is likely to be directly related to the performance of the Underlying Fund. The Fund’s NAV will change with changes in the value of the Underlying Fund and other securities in which the Fund invests based on their market valuations. An investment in the Fund will entail more direct and indirect costs and expenses than a direct investment in the Underlying Fund. For example, the Fund indirectly pays a portion of the expenses (including operating expenses and management fees) incurred by the Underlying Fund.

An investor in the Fund may receive taxable gains from portfolio transactions by the Underlying Fund, as well as taxable gains from transactions in shares of the Underlying Fund by the Fund.

As the Fund’s allocation to the Underlying Fund changes from time to time, or to the extent that the expense ratio of the Underlying Fund changes, the weighted average operating expenses borne by the Fund may increase or decrease.

Table of Contents

credit deterioration of the issuer or other factors. Changes to the financial condition or credit rating of an issuer of those securities may cause the value of the securities to decline. An issuer may also be subject to risks associated with the countries, states and regions in which the issuer resides, invests, sells products, or otherwise conducts operations.

Market Risk. The Fund and the Underlying Fund could lose money over short periods due to short-term market movements and over longer periods during more prolonged market downturns. Market risk arises mainly from uncertainty about future values of financial instruments and may be influenced by price, currency and interest rate movements. It represents the potential loss the Fund and the Underlying Fund may suffer through holding financial instruments in the face of market movements or uncertainty. The value of a security, asset or other instrument may decline due to changes in general market conditions, economic trends or events that are not specifically related to the issuer of the security or other asset, or factors that affect a particular issuer or issuers, country, group of countries, region, market, industry, group of industries, sector or asset class. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund, the Underlying Fund and their investments and could result in increased premiums or discounts to the Fund’s or Underlying Fund's NAV. During a general market downturn, multiple asset classes may be negatively affected. Fixed-income securities with short-term maturities are generally less sensitive to such changes than are fixed-income securities with longer-term maturities. Changes in market conditions and interest rates generally do not have the same impact on all types of securities and instruments.

Market Trading Risk.

Table of Contents

investors are subject to the execution and settlement risks and market standards of the market where they or their broker direct their trades for execution. Certain information available to investors who trade Fund or Underlying Fund shares on a U.S. stock exchange during regular U.S. market hours may not be available to investors who trade in other markets, which may result in secondary market prices in such markets being less efficient.

Secondary Market Trading Risk. Shares of the Fund or the Underlying Fund may trade in the secondary market at times when the Fund or the Underlying Fund does not accept orders to purchase or redeem shares. At such times, shares may trade in the secondary market with more significant premiums or discounts than might be experienced at times when the Fund or the Underlying Fund accepts purchase and redemption orders. If the Fund purchases shares of the Underlying Fund at a time when the market price of Underlying Fund shares is at a premium to its NAV or sells Underlying Fund shares when their market price is at a discount to its NAV, the Fund may incur losses.

Shares of the Fund or the Underlying Fund, similar to shares of other issuers listed on a stock exchange, may be sold short and are therefore subject to the risk of increased volatility and price decreases associated with being sold short. In addition, trading activity in derivative products based on the Fund or the Underlying Fund may lead to increased trading volume and volatility in the secondary market for the shares of the Fund.

Shares of the Fund and the Underlying Fund May Trade at Prices Other Than NAV. Shares of the Fund and the Underlying Fund each trade on stock exchanges at prices at, above or below the respective Fund’s and the Underlying Fund's most recent NAV. The NAV of the Fund and the Underlying Fund are calculated at the end of each business day and fluctuate with changes in the market value of the Fund’s or the Underlying Fund's holdings. The trading price of each of the Fund's and the Underlying Fund's shares fluctuates continuously throughout trading hours based on both market supply of and demand for their shares and the underlying value of their portfolio holdings or NAV. As a result, the trading prices of the Fund’s and the Underlying Fund's shares may deviate significantly from NAV during periods of market volatility, including during periods of significant redemption requests or other unusual market conditions. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S OR THE UNDERLYING FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV. However, because shares can be created and redeemed in Creation Units at NAV, BFA believes that large discounts or premiums to the NAV of the Fund or the Underlying Fund, as applicable, are not likely to be sustained over the long term (unlike shares of many closed-end funds, which frequently trade at appreciable discounts from, and sometimes at premiums to, their NAVs). While the creation/redemption feature is designed to make it more likely that the Fund’s or the Underlying Fund's shares

Table of Contents

normally will trade on stock exchanges at prices close to the Fund’s or the Underlying Fund's next calculated NAV, exchange prices are not expected to correlate exactly with the NAV due to timing reasons, supply and demand imbalances and other factors. In addition, disruptions to creations and redemptions, including disruptions at market makers, Authorized Participants, or other market participants, and during periods of significant market volatility, may result in trading prices for shares of the Fund or the Underlying Fund that differ significantly from their respective NAV. Authorized Participants may be less willing to create or redeem Fund or Underlying Fund shares if there is a lack of an active market for such shares or its underlying investments, which may contribute to the Fund’s or Underlying Fund's shares trading at a premium or discount to NAV.

Non-U.S. Issuers Risk. Securities issued by non-U.S. issuers have different risks from securities issued by U.S. issuers. These risks include differences in accounting, auditing and financial reporting standards, the possibility of expropriation or confiscatory taxation, adverse changes in investment or exchange control regulations, political instability which could affect U.S. investments in non-U.S. countries, uncertainties of transnational litigation, and potential restrictions on the flow of international capital, including the possible seizure or nationalization of the securities issued by non-U.S. issuers held by the Underlying Fund. Non-U.S. issuers may be subject to less governmental regulation than U.S. issuers. Moreover, individual non-U.S. economies may differ favorably or unfavorably from the U.S. economy in such respects as growth of gross domestic product, rate of inflation, capital reinvestment, resource self-sufficiency and balance of payment positions. Unfavorable political, economic or governmental developments in non-U.S. countries could affect the payment of a security’s principal and interest. Securities issued by non-U.S. issuers may also be less liquid than, and more difficult to value than, securities of U.S. issuers. In addition, the value of these securities may fluctuate due to changes in the exchange rate of the issuer’s local currency against the U.S. dollar.

Operational Risk. The Fund and the Underlying Fund are exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing

Table of Contents

and communication errors, errors of the Fund's or the Underlying Fund's service providers, counterparties or other third parties, failed or inadequate processes and technology or systems failures. The Fund, the Underlying Fund and BFA seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

Risk of Investing in Developed Countries. Investment in developed country issuers may subject the Fund or the Underlying Fund to regulatory, political, currency, security, economic and other risks associated with developed countries. Developed countries generally tend to rely on services sectors (e.g., the financial services sector) as the primary means of economic growth. A prolonged slowdown in one or more services sectors is likely to have a negative impact on economies of certain developed countries, although economies of individual developed countries can be impacted by slowdowns in other sectors. In the past, certain developed countries have been targets of terrorism, and some geographic areas in which the Fund or the Underlying Fund invests have experienced strained international relations due to territorial disputes, historical animosities, defense concerns and other security concerns. These situations may cause uncertainty in the financial markets in these countries or geographic areas and may adversely affect the performance of the issuers to which the Fund or the Underlying Fund has exposure. Heavy regulation of certain markets, including labor and product markets, may have an adverse effect on certain issuers. Such regulations may negatively affect economic growth or cause prolonged periods of recession. Many developed countries are heavily indebted and face rising healthcare and retirement expenses. In addition, price fluctuations of certain commodities and regulations impacting the import of commodities may negatively affect developed country economies.

Table of Contents

a significant effect on U.S. markets generally, as well as on the value of certain securities. Governmental agencies project that the U.S. will continue to maintain elevated public debt levels for the foreseeable future. Although elevated debt levels do not necessarily indicate or cause economic problems, elevated public debt service costs may constrain future economic growth.

Risk of Swap Agreements. Swaps can involve greater risks than direct investment in securities because swaps may be leveraged and are subject to counterparty risk (e.g., the risk of a counterparty defaulting on the obligation or bankruptcy), credit risk and pricing risk (i.e., swaps may be difficult to value). Swaps may be subject to illiquidity risk, and it may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses. Certain standardized swaps are subject to mandatory central clearing. Central clearing is expected to reduce counterparty credit risk and increase liquidity, but central clearing does not make swap transactions risk-free. All swaps require posting of collateral, which may restrict the ability of the Fund to invest the assets in different ways and which involve costs to the Fund. Swaps provide customized contractual terms, which may not, in all cases, provide the hedging or other intended benefits.

Table of Contents

the IRS. Because the Fund invests in the Underlying Fund, the Fund’s realized losses on sales of shares of the Underlying Fund may be indefinitely or permanently deferred as “wash sales.” Distributions of short-term capital gains by the Underlying Fund will be recognized as ordinary income by the Fund and would not be offset by the Fund’s capital loss carryforwards, if any. Capital loss carryforwards of the Underlying Fund, if any, would not offset net capital gains of the Fund. Each of these effects is caused by the Fund’s investment in the Underlying Fund and may result in distributions to Fund shareholders being of higher magnitude and less likely to qualify for lower capital gain tax rates than if the Fund were to invest directly in the securities and other instruments composing its portfolio.

Tracking Error Risk. The Fund may be subject to “tracking error,” which is the divergence of the Fund’s performance from that of the Underlying Index. Tracking error may occur because of differences between the securities and other instruments held in the Fund’s portfolio and those included in the Underlying Index, pricing differences (including, as applicable, differences between a security’s price at the local market close and the Fund's or an Underlying Fund's valuation of a security at the time of calculation of the Fund's or Underlying Fund's NAV, respectively), transaction costs incurred by the Fund, the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be heightened during times of increased market volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX ETFs THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN SWAP CONTRACTS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

Valuation Risk. The price the Fund and the Underlying Fund could receive upon the sale of a security or unwind of a financial instrument or other asset may differ from the Fund's or the Underlying Fund's valuation of the security, instrument or other asset, particularly for securities or other instruments that trade in low volume or volatile markets or that are valued using a fair value methodology as a result of trade suspensions or for other reasons. Because non-U.S. exchanges may be open on days when the Underlying Fund does not price its shares, the value of the securities or other instruments in the Underlying Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund’s or the Underlying Fund's shares. In addition, for purposes of calculating the Fund's NAV, the value of assets denominated in non-U.S. currencies is translated into U.S. dollars at the prevailing market rates. This translation may result in a difference between the prices used to calculate the Fund's NAV and the prices used by the Underlying Index, which, in turn, could result in a difference between the Fund's performance and the performance of the Underlying Index. Authorized Participants who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or used a different valuation

Table of Contents

methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

A Further Discussion of Other Risks

Communication Services Sector Risk. The communication services sector consists of both companies in the telecommunication services industry as well as those in the media and entertainment industry. Examples of companies in the telecommunication services industry group include providers of fiber-optic, fixed-line, cellular and wireless telecommunications networks. Companies in the media and entertainment industry group encompass a variety of services and products including television broadcasting, gaming products, social media, networking platforms, online classifieds, online review websites, and Internet search engines. Companies in the communication services sector may be affected by industry competition, substantial capital requirements, government regulation, and obsolescence of communications products and services due to technological advancement. Fluctuating domestic and international demand, shifting demographics and often unpredictable changes in consumer tastes can drastically affect a communication services company's profitability. In addition, while all companies may be susceptible to network security breaches, certain companies in the communication services sector may be particular targets of hacking and potential theft of proprietary or consumer information or disruptions in service, which could have a material adverse effect on their businesses.

Table of Contents

standardization, consumer preferences, rapid product obsolescence, research and development of new products, lack of standardization or compatibility with existing technologies, and a dependency on patent and copyright protections. Companies in the communication services sector may encounter distressed cash flows due to the need to commit substantial capital to meet increasing competition, particularly in developing new products and services using new technology. Technological innovations may make the products and services of certain communications companies obsolete.

Companies in the media and entertainment industries can be significantly affected by several factors, including competition, particularly in formulation of products and services using new technologies, cyclicality of revenues and earnings, a potential decrease in the discretionary income of targeted individuals, changing consumer tastes and interests, and the potential increase in government regulation. Companies in the media and entertainment industries may become obsolete quickly. Advertising spending can be an important revenue source for media and entertainment companies. During economic downturns advertising spending typically decreases and, as a result, media and entertainment companies tend to generate less revenue.

Table of Contents

relatively small number of customers, including governmental entities and utilities. As a result, governmental budget constraints may have a material adverse effect on the stock prices of companies in this sector. Energy companies may also operate in, or engage in transactions involving, countries with less developed regulatory regimes or a history of expropriation, nationalization or other adverse policies. Energy companies also face a significant risk of liability from accidents resulting in injury or loss of life or property, pollution or other environmental problems, equipment malfunctions or mishandling of materials and a risk of loss from terrorism, cyber incident, political strife or natural disasters. Any such event could have serious consequences for the general population of the affected area and could have an adverse impact on the Fund’s or the Underlying Fund's portfolio and the performance of the Fund. Energy companies can be significantly affected by the supply of, and demand for, specific products (e.g., oil and natural gas) and services, exploration and production spending, government subsidization, world events and general economic conditions. In the context of the COVID-19 outbreak and disputes among oil-producing countries regarding potential limits on the production of crude oil, the energy sector has recently experienced increased volatility. In particular, significant market volatility in the crude oil markets as well as the oil futures markets resulted in the market price of the front month WTI crude oil futures contracts falling below zero for a period of time. Energy companies may have relatively high levels of debt and may be more likely than other companies to restructure their businesses if there are downturns in energy markets or in the global economy.

Table of Contents

financial markets and asset valuations around the world. In addition, one or more countries may abandon the euro and/or withdraw from the EU. The U.K. left the EU (“Brexit” ) on January 31, 2020. The U.K. and EU have reached an agreement on the terms of their future trading relationship effective January 1, 2021, which principally relates to the trading of goods rather than services, including financial services. Further discussions are to be held between the U.K. and the EU in relation to matters not covered by the trade agreement, such as financial services. The Fund and the Underlying Fund face risks associated with the potential uncertainty and consequences that may follow Brexit, including with respect to volatility in exchange rates and interest rates. Brexit could adversely affect European or worldwide political, regulatory, economic or market conditions and could contribute to instability in global political institutions, regulatory agencies and financial markets. Brexit has also led to legal uncertainty and could lead to politically divergent national laws and regulations as a new relationship between the U.K. and EU is defined and the U.K. determines which EU laws to replace or replicate. Any of these effects of Brexit could adversely affect any of the companies to which the Fund has exposure and any other assets in which the Fund or the Underlying Fund invests. The political, economic and legal consequences of Brexit are not yet fully known. In the short term, financial markets may experience heightened volatility, particularly those in the U.K. and Europe, but possibly worldwide. The U.K. and Europe may be less stable than they have been in recent years, and investments in the U.K. and the EU may be difficult to value or subject to greater or more frequent volatility. In the longer term, there is likely to be a period of significant political, regulatory and commercial uncertainty as the U.K. continues to negotiate the terms of its future trading relationships.

LIBOR Risk. The Fund may be exposed to financial instruments that are tied to London Interbank Offered Rate (“LIBOR”) to determine payment obligations, financing terms, hedging strategies or investment value. The Fund’s investments may pay interest at floating rates based on LIBOR or may be subject to interest caps or floors based on LIBOR. The Fund may also obtain financing at floating rates based on LIBOR. Derivative instruments utilized by the Fund may also reference LIBOR.

Table of Contents

previously announced that a majority of USD LIBOR settings will no longer be published after June 30, 2023. While the FCA is requiring the IBA to publish certain LIBOR settings, potentially to include USD settings, on a “synthetic” basis, the “synthetic” methodology is not based on panel bank contributions and is not intended to be representative of the interest rates in the underlying market. The Fund may have investments linked to other interbank offered rates, such as the Euro Overnight Index Average (“EONIA”), which may also cease to be published. Various financial industry groups continue planning for the transition away from LIBOR, but there are challenges to converting certain securities and transactions to a new reference rate, such as the Secured Overnight Financing Rate (“SOFR”), which is intended to replace USD LIBOR. For example, at times, SOFR has proven to be more volatile than the 3-month USD LIBOR. Working groups and regulators in other countries have suggested other alternatives for their markets, including the Sterling Overnight Interbank Average Rate (“SONIA”) in England.

Neither the effect of the LIBOR transition process nor its ultimate success can yet be known. The transition process might lead to increased volatility and illiquidity in markets for, and reduce the effectiveness of new hedges placed against, instruments whose terms currently include LIBOR. While some existing LIBOR-based instruments may contemplate a scenario where LIBOR is no longer available by providing for an alternative rate-setting methodology, there may be significant uncertainty regarding the effectiveness of any such alternative methodologies to replicate LIBOR. Not all existing LIBOR-based instruments may have alternative rate-setting provisions and there remains uncertainty regarding the willingness and ability of issuers to add alternative rate-setting provisions in certain existing instruments. Global regulators have advised market participants to cease entering into new contracts using LIBOR as a reference rate, and it is possible that investments in LIBOR-based instruments could invite regulatory scrutiny. In addition, a liquid market for newly issued instruments that use a reference rate other than LIBOR still may be developing. There may also be challenges for the Fund to enter into hedging transactions against such newly issued instruments until a market for such hedging transactions develops. All of the aforementioned may adversely affect the Fund’s performance or NAV.

Money Market Instruments Risk. The value of money market instruments may be affected by changing interest rates and by changes in the credit ratings of the investments. If a significant amount of the Fund's assets are invested in money market instruments, it will be more difficult for the Fund to achieve its investment objective. An investment in a money market fund is not insured or guaranteed by the FDIC or any other government agency. It is possible to lose money by investing in a money market fund. Money market funds other than government money market funds or retail money market funds “float” their NAV instead of using a stable $1.00 per share price.

Table of Contents

rates and competition for the services of qualified personnel. Companies in the technology sector are heavily dependent on patent and other intellectual property rights. A technology company’s loss or impairment of these rights may adversely affect the company’s profitability. Companies in the technology sector are facing increased government and regulatory scrutiny and may be subject to adverse government or regulatory action. The technology sector may also be adversely affected by changes or trends in commodity prices, which may be influenced or characterized by unpredictable factors.

Threshold/Underinvestment Risk. If certain aggregate and/or fund-level ownership thresholds are reached through transactions undertaken by BFA, its affiliates or the Fund, or as a result of third-party transactions or actions by an issuer or regulator, the ability of BFA and its affiliates on behalf of clients (including the Fund) to purchase or dispose of investments, or exercise rights or undertake business transactions, may be restricted by regulation or otherwise impaired. The capacity of the Fund to make investments in certain securities may be affected by the relevant threshold limits, and such limitations may have adverse effects on the liquidity and performance of the Fund’s portfolio holdings.

Portfolio Holdings Information

A Further Discussion of Principal Investment Strategies

Overview

The Fund allocates and reallocates its assets among direct investments in securities and other instruments, and in investments in the Underlying Fund consistent with the allocation and reallocation of securities in the Underlying Index as determined by the Index Provider. The Fund intends to invest a substantial portion of its assets in one underlying fund, the Underlying Fund. The Fund seeks to track the interest rate hedging component of the Underlying Index primarily through the use of positions in interest rate swaps (i.e., contracts in which the Fund makes fixed-rate payments while receiving floating-rate payments based on a reference rate).

The Fund invests, through the Underlying Fund, in U.S. dollar-denominated, investment-grade corporate securities and debt instruments, which are subject to additional risks, as described in this Prospectus and in the Fund’s SAI.

The Underlying Fund

Table of Contents

The Fund invests a substantial portion of its assets in the Underlying Fund, so the Fund’s investment performance is directly related to the performance of the Underlying Fund. The Fund’s NAV will change with changes in the value of the Underlying Fund and other securities in which the Fund invests. An investment in the Fund will entail more direct and indirect costs and expenses than a direct investment in the Underlying Fund.

The Underlying Fund seeks to track the performance of the Markit iBoxx^® USD Liquid Investment Grade Index. The Markit iBoxx^® USD Liquid Investment Grade Index includes liquid, U.S. dollar-denominated, investment-grade corporate bonds for sale in the U.S., as determined by the index provider. The Markit iBoxx^® USD Liquid Investment Grade Index is a trademark of and is maintained by Markit Indices Limited (“Markit”) and has been licensed for use for certain purposes by BFA or its affiliates. Markit makes no representation or warranty, expressed or implied, regarding the advisability of investing in the Underlying Fund.

Management

Investment Adviser. As investment adviser, BFA has overall responsibility for the general management and administration of the Fund. BFA provides an investment program for the Fund and manages the investment of the Fund’s assets. In managing the Fund, BFA may draw upon the trading, research and expertise of its asset management affiliates for portfolio decisions and management with respect to portfolio securities. In seeking to achieve the Fund's investment objective, BFA uses teams of portfolio managers, investment strategists and other investment specialists. This team approach brings together many disciplines and leverages BFA’s extensive resources.

For its investment advisory services to the Fund, BFA is paid a management fee from the Fund based on a percentage of the Fund's average daily net assets, at the annual rate of 0.30%. BFA has contractually agreed to waive a portion of its management fees

Table of Contents

so that the Fund’s total annual fund operating expenses after fee waiver are equal to the Acquired Fund Fees and Expenses attributable to the Fund’s investment in LQD, after taking into account any fee waivers by LQD, plus 0.10% through February 28, 2027. The contractual waiver may be terminated prior to February 28, 2027 only upon written agreement of the Trust and BFA. In addition, BFA may from time to time voluntarily waive and/or reimburse fees or expenses in order to limit total annual fund operating expenses (excluding Acquired Fund Fees and Expenses, if any). Any such voluntary waiver or reimbursement may be eliminated by BFA at any time.

Table of Contents

sustain losses during periods in which one or more Affiliates and other accounts achieve profits on their trading for proprietary or other accounts. The opposite result is also possible.

The Fund's activities may be limited because of regulatory restrictions applicable to BFA or one or more Affiliates and/or their internal policies designed to comply with such restrictions.

Shareholder Information

Table of Contents

for shares of the Fund purchased on an exchange or otherwise in the secondary market. The Fund's shares trade under the ticker symbol “LQDH.”

Buying or selling Fund shares on an exchange or other secondary market involves two types of costs that may apply to all securities transactions. When buying or selling shares of the Fund through a broker, you may incur a brokerage commission and other charges. The commission is frequently a fixed amount and may be a significant proportional cost for investors seeking to buy or sell small amounts of shares. In addition, you may incur the cost of the “spread,” that is, any difference between the bid price and the ask price. The spread varies over time for shares of the Fund based on the Fund’s trading volume and market liquidity, and is generally lower if the Fund has high trading volume and market liquidity, and higher if the Fund has little trading volume and market liquidity (which is often the case for funds that are newly launched or small in size). The Fund's spread may also be impacted by the liquidity or illiquidity of the underlying securities held by the Fund, particularly for newly launched or smaller funds or in instances of significant volatility of the underlying securities.

The Board has adopted a policy of not monitoring for frequent purchases and redemptions of Fund shares (“frequent trading”) that appear to attempt to take advantage of a potential arbitrage opportunity presented by a lag between a change in the value of the Fund’s portfolio securities after the close of the primary markets for the Fund’s portfolio securities and the reflection of that change in the Fund’s NAV (“market timing”), because the Fund sells and redeems its shares directly through transactions that are in-kind and/or for cash, subject to the conditions described below under Creations and Redemptions. The Board has not adopted a policy of monitoring for other frequent trading activity because shares of the Fund are listed for trading on a national securities exchange.

Section 12(d)(1) of the 1940 Act generally restricts investments by investment companies, including foreign and unregistered investment companies, in the securities of other investment companies. For example, a registered investment company (the “Acquired Fund”), such as the Fund, may not knowingly sell or otherwise dispose of any security issued by the Acquired Fund to any investment company (the “Acquiring Fund”) or any company or companies controlled by the Acquiring Fund if, immediately after such sale or disposition: (i) more than 3% of the total outstanding voting stock of the Acquired Fund is owned by the Acquiring Fund and any company or companies controlled by the Acquiring Fund or (ii) more than 10% of the total outstanding voting stock of the Acquired Fund is owned by the Acquiring Fund and other investment companies and companies controlled by them. Although SEC rules may permit registered investment companies and unit investment trusts (“Investing Funds”) that enter into an investment agreement with the Trust to invest in iShares funds beyond the limits set forth in Section 12(d)(1) of the 1940 Act subject to certain terms and

Table of Contents

conditions, the Fund does not permit such investments. Accordingly, Investing Funds must adhere to the limits set forth in Section 12(d)(1) of the 1940 Act when investing in the Fund. In addition, foreign investment companies are permitted to invest in the Fund only up to the limits set forth in Section 12(d)(1), subject to any applicable SEC no-action relief.

Share Prices. The trading prices of the Fund’s shares in the secondary market generally differ from the Fund’s daily NAV and are affected by market forces such as the supply of and demand for ETF shares and underlying securities held by the Fund, economic conditions and other factors.

Determination of Net Asset Value. The NAV of the Fund normally is determined once daily Monday through Friday, generally as of the close of regular trading hours of the New York Stock Exchange (“NYSE”) (normally 4:00 p.m., Eastern time) on each day that the NYSE is open for trading, based on prices at the time of closing, provided that any Fund assets or liabilities denominated in currencies other than the U.S. dollar are translated into U.S. dollars at the prevailing market rates on the date of valuation as quoted by one or more data service providers. The NAV of the Fund is calculated by dividing the value of the net assets of the Fund (i.e., the value of its total assets, which includes the value of the Underlying Fund shares in which the Fund invests, less total liabilities) by the total number of outstanding shares of the Fund, generally rounded to the nearest cent.

The value of the securities and other assets and liabilities held by the Fund is determined pursuant to valuation policies and procedures approved by the Board.

Table of Contents

used with respect to debt obligations with sixty days or less remaining to maturity unless BFA determines in good faith that such method does not represent fair value.

Generally, trading in non-U.S. securities and money market instruments is substantially completed each day at various times prior to the close of regular trading hours of the NYSE. The values of such securities used in computing the NAV of the Fund are determined as of such times.

Dividends and Distributions

General Policies. Dividends from net investment income, if any, generally are declared and paid at least once a year by the Fund. Distributions of net realized securities gains, if any, generally are declared and paid once a year, but the Trust may make distributions on a more frequent basis for the Fund. The Trust reserves the right to declare special distributions if, in its reasonable discretion, such action is necessary or advisable to preserve its status as a regulated investment company or to avoid imposition of income or excise taxes on undistributed income or realized gains.

Table of Contents

Taxes. As with any investment, you should consider how your investment in shares of the Fund will be taxed. The tax information in this Prospectus is provided as general information, based on current law. There is no guarantee that shares of the Fund will receive certain regulatory or accounting treatment. You should consult your own tax professional about the tax consequences of an investment in shares of the Fund.

You may lose the ability to use foreign tax credits passed through by the Fund if your Fund shares are loaned out pursuant to a securities lending agreement.

Table of Contents

Dividends, interest and capital gains earned by the Underlying Fund with respect to securities issued by non-U.S. issuers may give rise to withholding and other taxes imposed by non-U.S. countries. Tax conventions between certain countries and the U.S. may reduce or eliminate such taxes. If more than 50% of the total assets of the Underlying Fund at the close of a year consists of non-U.S. stocks or securities (generally, for this purpose, depositary receipts, no matter where traded, of non-U.S. companies are treated as “non-U.S.”) (and 50% of the total assets of the Fund at the close of the year consists of securities issued by non-U.S. issuers, or, at the close of each quarter, shares of the Underlying Fund), the Fund may “pass through” to you certain non-U.S. income taxes (including withholding taxes) paid by the Fund or the Underlying Fund. This means that you would be considered to have received as an additional dividend your share of such non-U.S. taxes, but you may be entitled to either a corresponding tax deduction in calculating your taxable income, or, subject to certain limitations, a credit in calculating your U.S. federal income tax.

If you are neither a resident nor a citizen of the U.S. or if you are a non-U.S. entity (other than a pass-through entity to the extent owned by U.S. persons), the Fund’s ordinary income dividends (which include distributions of net short-term capital gains) will generally be subject to a 30% U.S. federal withholding tax, unless a lower treaty rate applies provided that withholding tax will generally not apply to any gain or income realized by a non-U.S. shareholder in respect of any distributions of long-term capital gains or upon the sale or other disposition of shares of the Fund.

Separately, a 30% withholding tax is currently imposed on U.S.-source dividends, interest and other income items paid to (i) foreign financial institutions, including non-U.S. investment funds, unless they agree to collect and disclose to the IRS information regarding their direct and indirect U.S. account holders and (ii) certain other foreign entities, unless they certify certain information regarding their direct and indirect U.S. owners. To avoid withholding, foreign financial institutions will need to (i) enter into agreements with the IRS that state that they will provide the IRS information, including the names, addresses and taxpayer identification numbers of direct and indirect U.S. account holders; comply with due diligence procedures with respect to the identification of U.S. accounts; report to the IRS certain information with respect to U.S. accounts maintained, agree to withhold tax on certain payments made to non-compliant foreign financial institutions or to account holders who fail to provide the required information; and determine certain other information concerning their account holders, or (ii) in the event that an applicable intergovernmental agreement and implementing legislation are adopted, provide local revenue authorities with

Table of Contents

similar account holder information. Other foreign entities may need to report the name, address, and taxpayer identification number of each substantial U.S. owner or provide certifications of no substantial U.S. ownership, unless certain exceptions apply.

Table of Contents

To the extent the Fund engages in in-kind transactions, the Fund intends to comply with the U.S. federal securities laws in accepting securities for deposit and satisfying redemptions with redemption securities by, among other means, assuring that any securities accepted for deposit and any securities used to satisfy redemption requests will be sold in transactions that would be exempt from registration under the Securities Act of 1933, as amended (the “1933 Act”). Further, an Authorized Participant that is not a “qualified institutional buyer,” as such term is defined in Rule 144A under the 1933 Act, will not be able to receive restricted securities eligible for resale under Rule 144A.

Table of Contents

investors who share the same address, even if their accounts are registered under different names. Please contact your broker-dealer if you are interested in enrolling in householding and receiving a single copy of prospectuses and other shareholder documents, or if you are currently enrolled in householding and wish to change your householding status.

Distribution

Table of Contents

Financial Highlights

The financial highlights table is intended to help investors understand the Fund’s financial performance for the past five years. Certain information reflects financial results for a single share of the Fund. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in the Fund, assuming reinvestment of all dividends and distributions. This information has been audited by PricewaterhouseCoopers LLP, whose report is included, along with the Fund's financial statements, in the Fund's Annual Report (available upon request).

Financial Highlights
(For a share outstanding throughout each period)

	iShares Interest Rate Hedged Corporate Bond ETF
	Year Ended 10/31/21	Year Ended 10/31/20	Year Ended 10/31/19	Year Ended 10/31/18	Year Ended 10/31/17
Net asset value, beginning of year	$91.84	$93.50	$95.79	$96.62	$92.49
Net investment income^(a)	2.23	2.38	3.35	3.16	2.76
Net realized and unrealized gain (loss)^(b)	3.68	(1.69)	(0.97)	(1.16)	3.73
Net increase from investment operations	5.91	0.69	2.38	2.00	6.49
Distributions^(c)
From net investment income	(1.63)	(2.35)	(3.12)	(2.83)	(2.36)
From net realized gain	—	—	(1.55)	—	—
Total distributions	(1.63)	(2.35)	(4.67)	(2.83)	(2.36)
Net asset value, end of year	$96.12	$91.84	$93.50	$95.79	$96.62
Total Return^(d)
Based on net asset value	6.46%	0.79%	2.63%	2.08%	7.11%
Ratios to Average Net Assets
Total expenses^(e)	0.30%	0.30%	0.30%	0.30%	0.30%
Total expenses after fees waived^(e)	0.10%	0.10%	0.10%	0.10%	0.10%
Net investment income	2.33%	2.64%	3.59%	3.27%	2.91%
Supplemental Data
Net assets, end of year (000)	$716,090	$450,004	$126,232	$215,530	$77,295
Portfolio turnover rate^(f)(g)	5%	7%	4%	2%	0%^(h)
^(a) Based on average shares outstanding.
^(b) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.
^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.
^(d) Where applicable, assumes the reinvestment of distributions.
^(e) The Fund indirectly bears its proportionate share of fees and expenses incurred by the underlying fund in which the Fund is invested (“acquired fund fees and expenses”). This ratio does not include these acquired fund fees and expenses.
^(f) Portfolio turnover rate excludes in-kind transactions.
^(g) Portfolio turnover rate excludes the portfolio activity of the underlying fund in which the Fund is invested. See the underlying fund's financial highlights for its respective portfolio turnover rates.
^(h) Rounds to less than 1%.

Table of Contents

Index Provider

Table of Contents

Disclaimers

Shares of the Fund are not sponsored, endorsed or promoted by NYSE Arca. NYSE Arca makes no representation or warranty, express or implied, to the owners of the shares of the Fund or any member of the public regarding the ability of the Fund to achieve its investment objective. NYSE Arca is not responsible for, nor has it participated in, the determination of the Fund's investments, nor in the determination of the timing of, prices of, or quantities

Table of Contents

of shares of the Fund to be issued, nor in the determination or calculation of the equation by which the shares are redeemable. NYSE Arca has no obligation or liability to owners of the shares of the Fund in connection with the administration, marketing or trading of the shares of the Fund.

Without limiting any of the foregoing, in no event shall NYSE Arca have any liability for any direct, indirect, special, punitive, consequential or any other damages (including lost profits) even if notified of the possibility of such damages.

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

Want to know more?

iShares.com | 1-800-474-2737

If you have any questions about the Trust or shares of the Fund or you wish to obtain the SAI, Semi-Annual or Annual Report free of charge, please:

Call:	1-800-iShares or 1-800-474-2737 (toll free) Monday through Friday, 8:30 a.m. to 6:30 p.m. (Eastern time)
Email:	iSharesETFs@blackrock.com
Write:	c/o BlackRock Investments, LLC 1 University Square Drive, Princeton, NJ 08540

Investment Company Act File No.: 811-22649

IS-P-LQDH-0322

	March 1, 2022

2022 Prospectus

iShares U.S. ETF Trust

•	iShares Interest Rate Hedged Emerging Markets Bond ETF \| EMBH \| NYSE ARCA

Table of Contents

Fund Overview	S-1
More Information About the Fund	1
A Further Discussion of Principal Risks	2
A Further Discussion of Other Risks	23
Portfolio Holdings Information	28
A Further Discussion of Principal Investment Strategies	28
Management	29
Shareholder Information	32
Distribution	40
Financial Highlights	41
Index Provider	42
Disclaimers	43

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

iSHARES^® INTEREST RATE HEDGED EMERGING MARKETS BOND ETF

Ticker: EMBH

Stock Exchange: NYSE Arca

Investment Objective

The iShares Interest Rate Hedged Emerging Markets Bond ETF (the “Fund”) seeks to track the investment results of an index designed to mitigate the interest rate risk of a portfolio composed of U.S. dollar-denominated, emerging market bonds.

Fees and Expenses

The following table describes the fees and expenses that you will incur if you buy, hold and sell shares of the Fund. The investment advisory agreement between iShares U.S. ETF Trust (the “Trust”) and BlackRock Fund Advisors (“BFA”) (the “Investment Advisory Agreement”) provides that BFA will pay all operating expenses of the Fund, except: (i) the management fees, (ii) interest expenses, (iii) taxes, (iv) expenses incurred with respect to the acquisition and disposition of portfolio securities and the execution of portfolio transactions, including brokerage commissions, (v) distribution fees or expenses, and (vi) litigation expenses and extraordinary expenses. The Fund may incur “Acquired Fund Fees and Expenses.” Acquired Fund Fees and Expenses reflect the Fund's pro rata share of the fees and expenses incurred by investing in other investment companies. The impact of Acquired Fund Fees and Expenses is included in the total returns of the Fund. Acquired Fund Fees and Expenses are not included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Fund's prospectus (the “Prospectus”). BFA, the investment adviser to the Fund, has contractually agreed to waive a portion of its management fees so that the Fund’s total annual fund operating expenses after fee waiver are equal to the Acquired Fund Fees and Expenses attributable to the Fund’s investment in the iShares J.P. Morgan USD Emerging Markets Bond ETF (“EMB” or the “Underlying Fund”), after taking into account any fee waivers by EMB, plus 0.10% through February 28, 2027. The contractual waiver may be terminated prior to February 28, 2027 only upon written agreement of the Trust and BFA.

You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Annual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investments)
Management Fees	Distribution and Service (12b-1) Fees	Other Expenses¹	Acquired Fund Fees and Expenses	Total Annual Fund Operating Expenses	Fee Waiver	Total Annual Fund Operating Expenses After Fee Waiver
0.75%	None	0.00%	0.37%	1.12%	(0.65)%	0.47%

¹	The amount rounded to 0.00%.

S-1

Table of Contents

1 Year		3 Years		5 Years		10 Years
$48		$151		$263		$1033

Portfolio Turnover. The Fund or the Underlying Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate for the Fund or the Underlying Fund may indicate higher transaction costs and may cause the Fund or the Underlying Fund to incur increased expenses. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example (except costs to the Underlying Fund included as part of Acquired Fund Fees and Expenses), affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 5% of the average value of its portfolio. To the extent the Underlying Fund incurs costs from high portfolio turnover, such costs may have a negative effect on the performance of the Fund.

Principal Investment Strategies

The Fund seeks to track the investment results of the BlackRock Interest Rate Hedged Emerging Markets Bond Index (the “Underlying Index”), which is designed to minimize the interest rate risk of a portfolio composed of U.S. dollar-denominated, emerging market bonds, represented in the Underlying

The Fund seeks to track the interest rate hedging component of the Underlying Index primarily through the use of positions in interest rate swaps (i.e., contracts in which the Fund makes fixed-rate payments while receiving floating-rate payments based on a reference rate). The different maturities and weights of the swap contracts included in the Underlying Index are intended to hedge the portfolio’s duration exposure (i.e., sensitivity to changes in interest rates) at key points on the yield curve, as determined by the Index Provider. The Underlying Index includes a fixed number of shares (to be adjusted in the event of any stock splits)

S-2

Table of Contents

of the Underlying Fund, and the Index Provider rebalances the weights of the swap contracts included in the Underlying Index daily. On a monthly basis, the Index Provider will add new swap contracts to the Underlying Index and remove the previous month’s swap contracts. Finally, the Index Provider includes a 5% cash position in the Underlying Index in order to represent the collateral that is required to be kept available for the margin requirements for the swap contracts.

The Fund may also invest in other interest rate futures contracts, including but not limited to, U.S. Treasuries, Eurodollar and Federal Funds futures. The Fund’s interest rate swap and futures positions are not intended to mitigate credit risk or other factors influencing the price of emerging market bonds, which may have a greater impact than interest rates.

The CFTC has adopted certain requirements that subject registered investment companies and their advisers to regulation by the CFTC if a registered investment company invests more than a prescribed level of its net asset value in CFTC-regulated futures, options and swaps, or if a registered investment company markets itself as providing investment exposure to such instruments. Due to the Fund’s use or potential use of CFTC-regulated futures, options and swaps above the prescribed levels, it is considered a “commodity pool” and BFA is considered a “commodity pool operator” with respect

to the Fund under the Commodity Exchange Act (“CEA”).

S-3

Table of Contents

The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of any collateral received).

Summary of Principal Risks

Asset Class Risk. Securities and other assets in the Fund's or the Underlying Fund's portfolio may underperform in

comparison to the general financial markets, a particular financial market or other asset classes.

Authorized Participant Concentration Risk. Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting. Authorized Participant concentration risk may be heightened for ETFs, such as the Fund, that invest in securities issued by non-U.S. issuers or other securities or instruments that have lower trading volumes.

S-4

Table of Contents

Calculation Methodology Risk. The Underlying Index relies on various sources of information to assess the criteria of issuers included in the Underlying Index , including information that may be based on assumptions and estimates. Neither the Fund nor BFA can offer assurances that the Underlying Index’s calculation methodology or sources of information will provide an accurate assessment of included issuers.

swaps or certain other investments could change at any time.

Credit Risk. Debt issuers and other counterparties may be unable or unwilling to make timely interest and/or principal payments when due or otherwise honor their obligations. Changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may also adversely affect the value of the Fund’s or Underlying Fund's investment in that issuer. The degree of credit risk depends on an issuer's or counterparty's financial condition and on the terms of an obligation.

Custody Risk. Less developed securities markets are more likely to experience problems with the clearing and settling of trades, as well as the holding of securities by local banks, agents and depositories.

S-5

Table of Contents

operations and/or potentially result in financial losses to the Fund and its shareholders. While the Fund has established business continuity plans and risk management systems seeking to address system breaches or failures, there are inherent limitations in such plans and systems. Furthermore, the Fund cannot control the cybersecurity plans and systems of the Fund’s Index Provider and other service providers, market makers, Authorized Participants, hedging counterparties to the Fund or issuers of securities in which the Fund or the Underlying Fund invests.

Underlying Fund to value accurately. The Fund or Underlying Fund could also suffer losses related to its derivatives positions as a result of unanticipated market movements, or movements between the time of periodic reallocations of Fund or Underlying Fund assets, which losses are potentially unlimited. Certain derivatives may give rise to a form of leverage and may expose the Fund or Underlying Fund to greater risk and increase its costs. The impact of U.S. and global regulation of derivatives may make derivatives more costly, may limit the availability of derivatives, may delay or restrict the exercise by the Fund or Underlying Fund of termination rights or remedies upon a counterparty default under derivatives held by the Fund or Underlying Fund (which could result in losses), or may otherwise adversely affect the value or performance of derivatives.

Hedging Risk. The Fund seeks to mitigate the potential impact of interest rates on the performance of emerging market bonds by entering into positions in U.S. Treasury and other futures and interest rate swaps. The Fund’s Treasury and other futures positions are not intended to mitigate credit risk or other factors influencing the price of emerging market bonds, which may have a greater impact than interest rates. There is no guarantee that the

S-6

Table of Contents

Fund’s Treasury and other futures and interest rate swap positions will completely eliminate the interest rate risk of the long positions in emerging market bonds. In addition, when interest rates fall, long–only emerging market bond investments will perform better than the Fund’s investments. In certain falling interest rate environments, the Fund’s hedging strategy could result in disproportionately larger losses in the Treasury and other futures and interest rate swap positions as compared to gains in the long emerging market bond positions attributable to interest rate changes. There is no guarantee the Fund will have positive returns, even in environments of sharply rising interest rates in which the Fund’s Treasury and other futures and interest rate swap positions might be expected to mitigate the effects of such rises. The Fund will incur expenses when entering into Treasury and other futures and interest rate swap positions.

High Yield Securities Risk. Securities that are rated below investment-grade (commonly referred to as “junk bonds,” which may include those bonds rated below “BBB-” by S&P Global Ratings and Fitch Ratings, Inc. (“Fitch”) or below “Baa3” by Moody's Investors Service, Inc. (“Moody's”)), or are unrated, may be deemed speculative, may involve greater levels of risk than higher-rated securities of similar maturity and may be more likely to default.

less without significantly changing the market value of the investment. To the extent the Fund holds illiquid investments, the illiquid investments may reduce the returns of the Fund because the Fund may be unable to transact at advantageous times or prices. During periods of market volatility, liquidity in the market for the Fund’s shares may be impacted by the liquidity in the market for the underlying securities or instruments held by the Fund, which could lead to the Fund’s shares trading at a premium or discount to the Fund’s NAV.

Index-Related Risk. There is no guarantee that the Fund’s investment results will have a high degree of correlation to those of the Underlying Index or that the Fund will achieve its investment objective. Market disruptions and regulatory restrictions could have an adverse effect on the Fund’s ability to adjust its exposure to the required levels in order to track the Underlying Index. Errors in index data, index computations or the construction of the Underlying Index in accordance with its methodology may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, which may have an adverse impact on the Fund and its shareholders. Because the Index Provider is relatively new to the creation of securities indexes, there may be a

S-7

Table of Contents

greater risk that index errors will not be detected as quickly as they might be in the case of an index maintained by a long-standing index provider. Unusual market conditions may cause the Index Provider to postpone a scheduled rebalance, which could cause the Underlying Index to vary from its normal or expected composition.

increased, the Fund may have a very low or even negative yield. A low or negative yield would cause the Fund to lose money in certain conditions and over certain time periods. An increase in interest rates will generally cause the value of securities held by the Fund or the Underlying Fund to decline, may lead to heightened volatility in the fixed-income markets and may adversely affect the liquidity of certain fixed-income investments, including those held by the Fund or the Underlying Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. The historically low interest rate environment heightens the risks associated with rising interest rates.

S-8

Table of Contents

Investment in the Underlying Fund Risk. The Fund expects to invest a substantial portion of its assets in the Underlying Fund, so the Fund’s investment performance is likely to be directly related to the performance of the Underlying Fund. The Fund’s NAV will change with changes in the value of the Underlying Fund and other securities and instruments in which the Fund invests based on their market valuations. An investment in the Fund will entail more costs and expenses than a direct investment in the Underlying Fund.

Through its investment in the Underlying Fund, the Fund is exposed to Management Risk, Market Risk, and Market Trading Risk, among other risks.

securities or counterparty on other instruments may cause the value of the securities or instruments to decline.

Market Risk. The Fund and the Underlying Fund could lose money over short periods due to short-term market movements and over longer periods during more prolonged market downturns. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund, the Underlying Fund and their investments and could result in increased premiums or discounts to the Fund’s or Underlying Fund's NAV.

S-9

Table of Contents

confiscatory taxation, adverse changes in investment or exchange control regulations, political instability, regulatory and economic differences, and potential restrictions on the flow of international capital. The Fund is specifically exposed to Asian Economic Risk, Central and South American Economic Risk and Middle Eastern Economic Risk.

Privatization Risk. Some countries in which the Fund or Underlying Fund invests have privatized, or have begun

the process of privatizing, certain entities and industries. Privatized entities may lose money or be re-nationalized.

Reliance on Trading Partners Risk. The Fund or Underlying Fund invests in countries or regions whose economies are heavily dependent upon trading with key partners. Any reduction in this trading may have an adverse impact on the Fund's or Underlying Fund's investments. Through its holdings of securities of certain issuers, the Fund or Underlying Fund is specifically exposed to Asian Economic Risk, Central and South American Economic Risk, European Economic Risk and U.S. Economic Risk.

Risk of Investing in Emerging Markets. Investments in emerging market issuers may be subject to a greater risk of loss than investments in issuers located or operating in more developed markets. Emerging markets may be more likely to experience inflation, political turmoil and rapid changes in economic conditions than more developed markets. Companies in many emerging markets are not subject to the same degree of regulatory requirements, accounting standards or auditor oversight as companies in more developed countries, and as a result, information about the securities in which the Fund or the Underlying Fund invests may be less reliable or complete. Emerging markets often have less reliable securities valuations and greater risk associated with custody of securities than developed markets. There may be significant obstacles to obtaining information necessary for investigations into or litigation against companies and shareholders may have limited legal remedies.

S-10

Table of Contents

Risk of Investing in Saudi Arabia. The ability of foreign investors (such as the Fund or Underlying Fund) to invest in the securities of Saudi Arabian issuers is relatively new. Such ability could be restricted by the Saudi Arabian government at any time, and unforeseen risks could materialize with respect to foreign ownership in such securities. The economy of Saudi Arabia is dominated by petroleum exports. A sustained decrease in petroleum prices could have a negative impact on all aspects of the economy. Investments in the securities of Saudi Arabian issuers involve risks not typically associated with investments in securities of issuers in more developed countries that may negatively affect the value of the Fund’s or Underlying Fund's investments. Such heightened risks may include, among others, expropriation and/or nationalization of assets, restrictions on and government intervention in international trade, confiscatory taxation, political instability, including authoritarian and/or military involvement in governmental decision making, armed conflict, crime and instability as a result of religious, ethnic and/or socioeconomic unrest. There remains the possibility that instability in the larger Middle East region could adversely impact the economy of Saudi Arabia, and there is no assurance of political stability in Saudi Arabia.

counterparty risk, credit risk and pricing risk. Swaps may be subject to illiquidity risk, and it may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses.

Security Risk. Some countries and regions in which the Fund or Underlying Fund invests have experienced security concerns, such as terrorism and strained international relations. Incidents involving a country's or region's security may cause uncertainty in its markets and may adversely affect its economy and the Fund's or the Underlying Fund's investments.

Small Fund Risk. When the Fund’s size is small, the Fund may experience low trading volume and wide bid/ask spreads. In addition, the Fund may face the risk of being delisted if the Fund does not meet certain conditions of the listing exchange. Any resulting liquidation of the Fund could cause the Fund to incur elevated transaction costs for the Fund and negative tax consequences for its shareholders.

Sovereign and Quasi-Sovereign Obligations Risk. The Fund or the

S-11

Table of Contents

Underlying Fund may invest in securities issued by or guaranteed by sovereign governments and by entities affiliated with or backed by non-U.S. sovereign governments, which may be unable or unwilling to repay principal or interest when due. In times of economic uncertainty, the prices of these securities may be more volatile than those of corporate debt obligations or of other government debt obligations.

Structural Risk. The countries in which the Fund or the Underlying Fund invests may be subject to considerable degrees of economic, political and social instability.

Underlying Fund may be indefinitely or permanently deferred as “wash sales.” Distributions of short-term capital gains by the Underlying Fund will be recognized as ordinary income by the Fund and would not be offset by the Fund’s capital loss carryforwards, if any. Capital loss carryforwards of the Underlying Fund, if any, would not offset net capital gains of the Fund. Each of these effects is caused by the Fund’s investment in the Underlying Fund and may result in distributions to Fund shareholders being of higher magnitude and less likely to qualify for lower capital gain tax rates than if the Fund were to invest directly in the securities and other instruments composing its portfolio.

S-12

Table of Contents

existing regulatory requirements, among other reasons. This risk may be heightened during times of increased market volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX EXCHANGE TRADED FUNDS (“ETFs”) THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN SWAP CONTRACTS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

a fair value methodology as a result of trade suspensions or for other reasons. In addition, the value of the securities or other instruments in the Fund's or the Underlying Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund's or the Underlying Fund's shares. Authorized Participants who purchase or redeem Fund shares on days when the Fund or the Underlying Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund or the Underlying Fund not fair-valued securities or used a different valuation methodology. The Fund’s or the Underlying Fund's ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

S-13

Table of Contents

Performance Information

The bar chart and table that follow show how the Fund has performed on a calendar year basis and provide some indication of the risks of investing in the Fund by showing how the Fund’s average annual returns for 1 and 5 years and since inception compare with those of a broad measure of market performance. Both assume that all dividends and distributions have been reinvested in the Fund. Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. If BFA had not waived certain Fund fees during certain periods, the Fund's returns would have been lower. Effective December 1, 2021, the Fund is no longer actively managed. The performance information below prior to December 1, 2021 is based on the performance of the Fund when it was actively managed by BFA using an investment strategy substantially similar to the methodology of the Underlying Index.

Year by Year Returns (Years Ended December 31)

The best calendar quarter return during the periods shown above was 12.53% in the 2nd quarter of 2020; the worst was -21.84% in the 1st quarter of 2020.

Updated performance information, including the Fund’s current NAV, may be obtained by visiting our website at www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).

S-14

Table of Contents

Average Annual Total Returns

(for the periods ended December 31, 2021)

	One Year	Five Years	Since Fund Inception
(Inception Date: 7/22/2015)
Return Before Taxes	1.29%	2.34%	2.77%
Return After Taxes on Distributions¹	0.26%	0.81%	1.19%
Return After Taxes on Distributions and Sale of Fund Shares¹	0.76%	1.13%	1.42%
J.P. Morgan EMBI Global Core Swap Hedged Index^2,3 (Index returns do not reflect deductions for fees, expenses, or taxes)	1.59%	2.55%	2.95%
BlackRock Interest Rate Hedged Emerging Markets Bond Index³ (Index returns do not reflect deductions for fees, expenses, or taxes)	N/A	N/A	N/A

²	The J.P. Morgan EMBI Global Core Swap Hedged Index is an unmanaged index that consists of the J.P. Morgan EMBI^® Global Core Index plus interest rate swaps that intend to hedge the interest rate exposure of the J.P. Morgan EMBI^® Global Core Index.
³	Effective December 1, 2021, the fund is no longer actively managed and the Fund's new Underlying Index is the BlackRock Interest Rate Hedged Emerging Markets Bond Index. The inception date of the BlackRock Interest Rate Hedged Emerging Markets Bond Index is October 29, 2021.

S-15

Table of Contents

Management

Investment Adviser. BlackRock Fund Advisors.

Purchase and Sale of Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

S-16

Table of Contents

More Information About the Fund

Effective December 1, 2021, the Fund is no longer actively managed and the Fund's new Underlying Index is the BlackRock Interest Rate Hedged Emerging Markets Bond Index.

“Tracking error” is the divergence of the Fund's performance from that of the

Table of Contents

Underlying Index. Because the Fund uses a representative sampling indexing strategy, it can be expected to have a larger tracking error than if it used a replication indexing strategy. “Replication” is an indexing strategy in which a fund invests in substantially all of the securities in its underlying index in approximately the same proportions as in the underlying index.

An investment in the Fund is not a bank deposit and it is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, BFA or any of its affiliates.

The Fund's investment objective and the Underlying Index may be changed without shareholder approval.

A Further Discussion of Principal Risks

The Fund is subject to various risks, including the principal risks noted below, any of which may adversely affect the Fund’s NAV, trading price, yield, total return and ability to meet its investment objective. The Fund may be exposed to these risks directly or indirectly through the Fund's investments in the Underlying Fund. You could lose all or part of your investment in the Fund, and the Fund could underperform other investments. The order of the below risk factors does not indicate the significance of any particular risk factor.

Asian Economic Risk. Many Asian economies have experienced rapid growth and industrialization in recent years, but there is no assurance that this growth rate will be maintained. Other Asian economies, however, have experienced high inflation, high unemployment, currency devaluations and restrictions, and over-extension of credit. Geopolitical hostility, political instability, and economic or environmental events in any one Asian country may have a significant economic effect on the entire Asian region, as well as on major trading partners outside Asia. Any adverse event in the Asian markets may have a significant adverse effect on some or all of the economies of the countries in which the Fund or Underlying Fund invests. In particular, China is a key trading partner of many Asian countries and any changes in trading relationships between China and other Asian countries may affect the region as a whole. Many Asian countries are subject to political risk, including political instability, corruption and regional conflict with neighboring countries. North Korea and South Korea each have substantial military capabilities, and historical tensions between the two countries present the risk of war. Escalated tensions involving the two countries and any outbreak of hostilities between the two countries, or even the threat of an outbreak of hostilities, could have a severe adverse effect on the entire Asian region. Certain Asian countries have developed increasingly strained relationships with the U.S. or with China, and if these relations were to worsen, they could adversely affect Asian issuers that rely on the U.S. or China for trade. In addition, many Asian countries are subject to social and labor risks associated with demands for improved political, economic and social conditions. These risks, among others, may adversely affect the value of the Fund's or the Underlying Fund's investments.

Table of Contents

industries, markets, market segments, asset classes or sectors. Various types of securities may experience cycles of outperformance and underperformance in comparison to the general financial markets depending upon a number of factors including, among other things, inflation, interest rates, productivity, global demand for local products or resources, and regulation and governmental controls. This may cause the Fund to underperform other investment vehicles that invest in different asset classes.

Authorized Participant Concentration Risk. Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem Creation Units, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting. Authorized Participant concentration risk may be heightened because ETFs, such as the Fund, that invest in securities issued by non-U.S. issuers or other securities or instruments that are less widely traded often involve greater settlement and operational issues and capital costs for Authorized Participants, which may limit the availability of Authorized Participants.

Calculation Methodology Risk. The Underlying Index relies on various sources of information to assess the criteria of issuers included in the Underlying Index , including information that may be based on assumptions and estimates. Neither the Fund nor BFA can offer assurances that the Underlying Index's calculation methodology or sources of information will provide an accurate assessment of included issuers.

Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Underlying Fund may “call” or repay the security before its stated maturity, and the Underlying Fund may have to reinvest the proceeds in securities with lower yields, which would result in a decline in the Fund’s income, or in securities with greater risks or with other less favorable features.

Cash Management Risk. To the extent the Fund holds cash, the Fund will earn reduced income (if any) on the cash and will be subject to the credit risk of the depository institution holding the cash and any fees imposed on large cash balances. If a significant amount of the Fund’s assets are invested in cash and cash equivalents, it will be more difficult for the Fund to achieve its investment objective. The Fund may underperform other funds that do not similarly invest in cash and cash equivalents for investment purposes and/or to collateralize derivative instruments.

Table of Contents

Central and South American Economic Risk. Certain Central and South American countries have experienced high interest rates, economic volatility, high levels of inflation, currency devaluations, government defaults and high unemployment rates. Additionally, commodities such as oil and gas, minerals and metals represent a significant percentage of the region’s exports, and the economies of countries in the region are particularly sensitive to fluctuations in commodity prices as a result. The impact of any of the foregoing events in one country could have a significant effect on the entire region.

Commodity Regulatory Risk. The Fund is deemed a “commodity pool ” and BFA is considered a “commodity pool operator” with respect to the Fund under the CEA. BFA is therefore subject to regulation by the SEC and the CFTC. BFA is also subject to regulation by the NFA. The regulatory requirements governing the use of commodity futures, options on commodity futures, certain swaps or certain other investments could change at any time.

Concentration Risk. The Fund may be susceptible to an increased risk of loss, including losses due to adverse events that affect the Fund’s investments more than the market as a whole, to the extent that the Fund's or the Underlying Fund's investments are concentrated in the securities and/or other assets of a particular issuer or issuers, representing a particular country, group of countries, region, market, industry, group of industries, sector, market segment or asset class. The Fund may be more adversely affected by the underperformance of those securities and/or other assets, may experience increased price volatility and may be more susceptible to adverse economic, market, political or regulatory occurrences affecting those securities and/or other assets than a fund that does not concentrate its investments.

Credit Risk. Credit risk is the risk that the issuer or guarantor of a debt instrument or the counterparty to a derivatives contract, repurchase agreement or loan of portfolio securities will be unable or unwilling to make its timely interest and/or principal payments when due or otherwise honor its obligations. There are varying degrees of credit risk, depending on an issuer’s or counterparty’s financial condition and on the terms of an obligation, which may be reflected in the issuer’s or counterparty’s credit rating. Certain portfolio holdings are rated below investment-grade, which means that they are at higher risk of defaulting. There is a chance, including a greater chance for below investment-grade investments, that the Fund’s or the Underlying Fund's portfolio holdings will have their credit ratings downgraded or will default (i.e., fail to make scheduled interest or principal payments), or that the market’s perception of an issuer’s creditworthiness may worsen, potentially reducing the Fund’s or the

Table of Contents

Underlying Fund's income level or share price, which may adversely affect the value of the Fund. The Fund’s hedging strategy does not seek to mitigate credit risk.

Custody Risk. Custody risk refers to the risks inherent in the process of clearing and settling trades, as well as the holding of securities by local banks, agents and depositories. Low trading volumes and volatile prices in less developed markets may make trades harder to complete and settle, and governments or trade groups may compel local agents to hold securities in designated depositories that may not be subject to independent evaluation. Local agents are held only to the standards of care of their local markets. In general, the less developed a country’s securities markets are, the higher the degree of custody risk.

Cybersecurity Risk. With the increased use of technologies such as the internet to conduct business, the Fund, the Underlying Fund, Authorized Participants, service providers and the relevant listing exchange are susceptible to operational, information security and related “cyber” risks both directly and through their service providers. Similar types of cybersecurity risks are also present for issuers of securities in which the Fund or the Underlying Fund invest, which could result in material adverse consequences for such issuers and may cause the Fund’s or the Underlying Fund's investment in such issuers to lose value. In general, cyber incidents can result from deliberate attacks or unintentional events. Cyber incidents include, but are not limited to, gaining unauthorized access to digital systems (e.g., through “hacking” or malicious software coding) for purposes of misappropriating assets or sensitive information, corrupting data, or causing operational disruption. Cyberattacks may also be carried out in a manner that does not require gaining unauthorized access, such as causing denial-of-service attacks on websites (i.e., efforts to make network services unavailable to intended users). Recently, geopolitical tensions may have increased the scale and sophistication of deliberate attacks, particularly those from nation-states or from entities with nation-state backing.

Table of Contents

states and their trading partners. The European financial markets have historically experienced volatility and adverse trends due to concerns about economic downturns or rising government debt levels in several European countries, including, but not limited to, Austria, Belgium, Cyprus, France, Greece, Ireland, Italy, Portugal, Spain and Ukraine. These events have adversely affected the exchange rate of the euro and may continue to significantly affect European countries.

Responses to financial problems by European governments, central banks and others, including austerity measures and reforms, may not produce the desired results, may result in social unrest, may limit future growth and economic recovery or may have other unintended consequences. Further defaults or restructurings by governments and other entities of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In addition, one or more countries may abandon the euro and/or withdraw from the EU. The U.K. left the EU (“Brexit”) on January 31, 2020. The U.K. and EU have reached an agreement on the terms of their future trading relationship effective January 1, 2021, which principally relates to the trading of goods rather than services, including financial services. Further discussions are to be held between the U.K. and the EU in relation to matters not covered by the trade agreement, such as financial services. The Fund and the Underlying Fund face risks associated with the potential uncertainty and consequences that may follow Brexit, including with respect to volatility in exchange rates and interest rates. Brexit could adversely affect European or worldwide political, regulatory, economic or market conditions and could contribute to instability in global political institutions, regulatory agencies and financial markets. Brexit has also led to legal uncertainty and could lead to politically divergent national laws and regulations as a new relationship between the U.K. and EU is defined and the U.K. determines which EU laws to replace or replicate. Any of these effects of Brexit could adversely affect any of the companies to which the Fund has exposure and any other assets in which the Fund or the Underlying Fund invests. The political, economic and legal consequences of Brexit are not yet fully known. In the short term, financial markets may experience heightened volatility, particularly those in the U.K. and Europe, but possibly worldwide. The U.K. and Europe may be less stable than they have been in recent years, and investments in the U.K. and the EU may be difficult to value or subject to greater or more frequent volatility. In the longer term, there is likely to be a period of significant political, regulatory and commercial uncertainty as the U.K. continues to negotiate the terms of its future trading relationships.

Table of Contents

The Fund seeks to mitigate the potential impact of rising interest rates on the performance of emerging market bonds by entering into positions in U.S. Treasury futures and interest rate swaps. The Treasury and other futures positions are not intended to mitigate credit risk or certain other factors influencing the price of emerging market bonds, which may have a greater impact than rising or falling interest rates. There is no guarantee that the futures and interest rate swap positions will achieve the targeted reduction in the interest rate risk of the long positions in emerging market bonds. In addition, when interest rates fall, investors may be better off in a long–only emerging market investment than with an investment in the Fund. Performance of the Fund could be particularly poor in risk-averse, flight-to-quality environments when it is common for emerging market bonds to decline in value. Furthermore, the Fund may be more volatile than a long-only investment in emerging market bonds. The Fund may contain a significant allocation to callable emerging market bonds, which are subject to call risk and prepayment risk (see Call Risk and Prepayment Risk); callable bonds may have lower sensitivity to interest rate declines than non-callable bonds or U.S. Treasury futures. In certain falling interest rate environments, this could result in disproportionately larger losses in the futures and interest rate swap positions as compared to gains in the long emerging market bond position attributable to interest rate changes. There is no guarantee the Fund will have positive returns, even in environments of sharply rising interest rates in which the Fund’s futures and interest rate swap positions might be expected to mitigate the effects of such rises. The Fund will incur expenses when entering into futures and interest rate swap positions. The use of hedging may result in certain adverse tax consequences, as noted in the Taxes section of the Prospectus.

High Yield Securities Risk. Securities that are rated below investment-grade (commonly referred to as “junk bonds,” which may include those bonds rated below “BBB-” by S&P Global Ratings and Fitch, or below “Baa3” by Moody’s), or are unrated, may be deemed speculative, may involve greater levels of risk than higher-rated securities of similar maturity and may be more likely to default.

The major risks of high yield securities investments include:

■	High yield securities may be issued by less creditworthy issuers. Issuers of high yield

Table of Contents

securities may have a larger amount of outstanding debt relative to their assets than issuers of investment-grade bonds. In the event of an issuer’s bankruptcy, claims of other creditors may have priority over the claims of high yield securities holders, leaving few or no assets available to repay high yield securities holders.

■	Prices of high yield securities are subject to extreme price fluctuations. Adverse changes in an issuer’s industry and general economic conditions may have a greater impact on the prices of high yield securities than on other higher rated fixed-income securities. The credit rating of a high yield security does not necessarily address its market value risk. Ratings and market value may change from time to time, positively or negatively, to reflect new developments regarding the issuer.
■	Issuers of high yield securities may be unable to meet their interest or principal payment obligations because of an economic downturn, specific issuer developments, or the unavailability of additional financing.
■	High yield securities frequently have redemption features that permit an issuer to repurchase the security from the Underlying Fund before it matures. If the issuer redeems high yield securities held by the Underlying Fund, the Underlying Fund may have to invest the proceeds in bonds with lower yields and may lose income.
■	High yield securities may be less liquid than higher rated fixed-income securities, even under normal economic conditions. There are fewer dealers in the high yield securities market, and there may be significant differences in the prices quoted for high yield securities by the dealers. Because high yield securities may be less liquid than higher rated fixed-income securities, judgment may play a greater role in valuing certain of the Fund's or Underlying Fund's securities than is the case with securities trading in a more liquid market.
■	The Fund or the Underlying Fund may incur expenses to the extent necessary to seek recovery upon default or to negotiate new terms with a defaulting issuer.

Table of Contents

other cash needs, the Fund may suffer a loss. This may be magnified in a rising interest rate environment or other circumstances where redemptions from the Fund may be greater than normal. Other market participants may be attempting to liquidate holdings at the same time as the Fund, causing increased supply of the Fund’s underlying investments in the market and contributing to illiquid investments risk and downward pricing pressure. During periods of market volatility, liquidity in the market for the Fund’s shares may be impacted by the liquidity in the market for the underlying securities or instruments held by the Fund, which could lead to the Fund’s shares trading at a premium or discount to the Fund's NAV.

Income Risk. The Fund’s income may decline if yields fall because the Fund or the Underlying Fund may hold a significant portion of short duration securities and/or securities that have floating or variable interest rates. The Fund’s income may decline because the Fund or the Underlying Fund invests in lower yielding bonds as bonds in its portfolio mature, are near maturity or are called, or when the Fund or the Underlying Fund needs to purchase additional bonds. Hedges entered into by the Fund may not be effective to hedge interest rate risk and, in this case, the income of the Fund may fall because both the securities of the Fund drop in value and the value of the futures and swaps held by the Fund decline.

Index-Related Risk. The Fund seeks to achieve a return that corresponds generally to the price and yield performance, before fees and expenses, of the Underlying Index as published by the Index Provider. There is no assurance that the Index Provider or any agents that may act on its behalf will compile the Underlying Index accurately, or that the Underlying Index will be determined, composed or calculated accurately. While the Index Provider provides descriptions of what the Underlying Index is designed to achieve, neither the Index Provider nor its agents provide any warranty or accept any liability in relation to the quality, accuracy or completeness of the Underlying Index or its related data, and they do not guarantee that the Underlying Index will be in line with the Index Provider’s methodology. BFA’s mandate as described in this Prospectus is to manage the Fund consistently with the Underlying Index provided by the Index Provider to BFA. BFA does not provide any warranty or guarantee against the Index Provider’s or any agent’s errors. Errors in respect of the quality, accuracy and completeness of the data used to compile the Underlying Index may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, particularly where the indices are less commonly used as benchmarks by funds or managers. In addition, there may be heightened risks associated with the adequacy and reliability of the information the Index Provider uses given the Fund's exposure to emerging markets, as certain emerging markets may have less information available or less regulatory oversight. Such errors may negatively or positively impact the Fund and its shareholders. For example, during a period where the Underlying Index contains incorrect constituents, the Fund would have market exposure to such constituents and would be underexposed to the Underlying Index’s other constituents. Shareholders should understand that any gains from Index Provider errors will be kept by the Fund and its shareholders and any losses or costs resulting from Index Provider errors will be borne by the Fund and its shareholders. Because the Index Provider is relatively new to the creation of securities indexes, there may be a greater risk that index errors will

Table of Contents

not be detected as quickly as they might be in the case of an index maintained by a long-standing index provider.

Unusual market conditions may cause the Index Provider to postpone a scheduled rebalance to the Underlying Index, which could cause the Underlying Index to vary from its normal or expected composition. The postponement of a scheduled rebalance in a time of market volatility could mean that constituents of the Underlying Index that would otherwise be removed at rebalance due to changes in market value, issuer credit ratings, or other reasons may remain, causing the performance and constituents of the Underlying Index to vary from those expected under normal conditions. Apart from scheduled rebalances, the Index Provider or its agents may carry out additional ad hoc rebalances to the Underlying Index due to reaching certain weighting constraints, unusual market conditions or corporate events or, for example, to correct an error in the selection of index constituents. When the Underlying Index is rebalanced and the Fund in turn rebalances its portfolio to attempt to increase the correlation between the Fund’s portfolio and the Underlying Index, any transaction costs and market exposure arising from such portfolio rebalancing will be borne directly by the Fund and its shareholders. Therefore, errors and additional ad hoc rebalances carried out by the Index Provider or its agents to the Underlying Index may increase the costs to and the tracking error risk of the Fund.

■	General Impact. This outbreak has resulted in travel restrictions, closed international borders, enhanced health screenings at ports of entry and elsewhere, disruption of, and delays in, healthcare service preparation and delivery, prolonged quarantines, cancellations, supply chain disruptions, lower consumer demand, temporary and permanent closures of stores, restaurants and other commercial establishments, layoffs, defaults and other significant economic impacts, as well as general concern and uncertainty.
■	Market Volatility. The outbreak has also resulted in extreme volatility, severe losses, and disruptions in markets which can adversely impact the Fund and its investments, including impairing hedging activity to the extent the Fund engages in such activity, as expected correlations between related markets or instruments may no longer apply. In addition, to the extent the Fund invests in short-term instruments that have negative yields, the Fund’s value may be impaired as a result. Certain issuers of equity securities have cancelled or announced the suspension of dividends. The outbreak has, and may continue to, negatively affect the credit ratings of some fixed-income securities and their issuers.
■	Market Closures. Certain local markets have been or may be subject to closures,

Table of Contents

and there can be no assurance that trading will continue in any local markets in which the Fund or the Underlying Fund may invest, when any resumption of trading will occur or, once such markets resume trading, whether they will face further closures. Any suspension of trading in markets in which the Fund or the Underlying Fund invests will have an impact on the Fund or Underlying Fund and its investments and will impact the Fund’s or the Underlying Fund's ability to purchase or sell securities in such markets.

■	Operational Risk. The outbreak could also impair the information technology and other operational systems upon which the Fund’s service providers, including BFA, rely, and could otherwise disrupt the ability of employees of the Fund's service providers to perform critical tasks relating to the Fund, for example, due to the service providers’ employees performing tasks in alternate locations than under normal operating conditions or the illness of certain employees of the Fund's service providers.
■	Governmental Interventions. Governmental and quasi-governmental authorities and regulators throughout the world have responded to the outbreak and the resulting economic disruptions with a variety of fiscal and monetary policy changes, including direct capital infusions into companies and other issuers, new monetary policy tools, and lower interest rates. An unexpected or sudden reversal of these policies, or the ineffectiveness of such policies, is likely to increase market volatility, which could adversely affect the Fund’s investments.
■	Pre-Existing Conditions. Public health crises caused by the outbreak may exacerbate other pre-existing political, social and economic risks in certain countries or globally, which could adversely affect the Fund and its investments and could result in increased premiums or discounts to the Fund's NAV.

Other infectious illness outbreaks that may arise in the future could have similar or other unforeseen effects.

Interest Rate Risk. If interest rates rise, the value of fixed-income securities or other instruments held by the Fund or the Underlying Fund would likely decrease. A measure investors commonly use to determine this price sensitivity is called duration. Fixed-income securities with longer durations tend to be more sensitive to interest rate changes, usually making their prices more volatile than those of securities with shorter durations. To the extent the Fund or the Underlying Fund invests a substantial portion of its assets in fixed-income securities with longer duration, rising interest rates may cause the value of the Fund's or the Underlying Fund's investments to decline significantly, which would adversely affect the value of the Fund. An increase in interest rates may lead to heightened volatility in the fixed-income markets and adversely affect certain fixed-income investments, including those held by the Fund or the Underlying Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. In addition, decreases in fixed income dealer market-making capacity may lead to lower trading volume, heightened volatility, wider bid-ask spreads and less transparent pricing in certain fixed-income markets.

Table of Contents

The historically low interest rate environment was created in part by the world’s major central banks keeping their overnight policy interest rates at, near or below zero percent and implementing monetary policy facilities, such as asset purchase programs, to anchor longer-term interest rates below historical levels. During periods of very low or negative interest rates, the Fund may be unable to maintain positive returns or pay dividends to Fund shareholders. Certain countries have recently experienced negative interest rates on certain fixed-income instruments. Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, result in heightened market volatility and detract from the Fund’s performance to the extent the Fund is exposed to such interest rates. Additionally, under certain market conditions in which interest rates are set at low levels and the market prices of portfolio securities have increased, the Fund or the Underlying Fund may have a very low or even negative yield. A low or negative yield would cause the Fund or the Underlying Fund to lose money in certain conditions and over certain time periods. Central banks may increase their short-term policy rates or begin phasing out, or “tapering,” accommodative monetary policy facilities in the future. The timing, coordination, magnitude and effect of such policy changes on various markets are uncertain, and such changes in monetary policy may adversely affect the value of the Fund’s investments.

Investment in the Underlying Fund Risk. The Fund expects to invest a substantial portion of its assets in the Underlying Fund, so the Fund’s investment performance is likely to be directly related to the performance of the Underlying Fund. The Fund’s NAV will change with changes in the value of the Underlying Fund and other securities in which the Fund invests based on their market valuations. An investment in the Fund will entail more direct and indirect costs and expenses than a direct investment in the Underlying Fund. For example, the Fund indirectly pays a portion of the expenses (including operating expenses and management fees) incurred by the Underlying Fund.

Table of Contents

An investor in the Fund may receive taxable gains from portfolio transactions by the Underlying Fund, as well as taxable gains from transactions in shares of the Underlying Fund by the Fund.

Market Risk. The Fund and the Underlying Fund could lose money over short periods due to short-term market movements and over longer periods during more prolonged market downturns. Market risk arises mainly from uncertainty about future values of financial instruments and may be influenced by price, currency and interest rate movements. It represents the potential loss the Fund and the Underlying Fund may suffer through holding financial instruments in the face of market movements or uncertainty. The value of a security, asset or other instrument may decline due to changes in general market conditions, economic trends or events that are not specifically related to the issuer of the security or other asset, or factors that affect a particular issuer or issuers, country, group of countries, region, market, industry, group of industries, sector or asset class. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund, the Underlying Fund and their investments and could result in increased premiums or discounts to the Fund’s or Underlying Fund's NAV. During a general market downturn, multiple asset classes may be negatively affected. Fixed-income securities with short-term maturities are generally less sensitive to such changes than are fixed-income securities with longer-term maturities. Changes in market conditions and interest rates generally do not have the same impact on all types of securities and instruments.

Table of Contents

Market Trading Risk.

Secondary Market Trading Risk. Shares of the Fund or the Underlying Fund may trade in the secondary market at times when the Fund or the Underlying Fund does not accept orders to purchase or redeem shares. At such times, shares may trade in the secondary market with more significant premiums or discounts than might be experienced at times when the Fund or the Underlying Fund accepts purchase and redemption orders. If the Fund purchases shares of the Underlying Fund at a time when the market price of Underlying Fund shares is at a premium to its NAV or sells Underlying Fund shares when their market price is at a discount to its NAV, the Fund may incur losses.

Table of Contents

fluctuate with changes in the market value of the Fund’s or the Underlying Fund's holdings. The trading price of each of the Fund's and the Underlying Fund's shares fluctuates continuously throughout trading hours based on both market supply of and demand for their shares and the underlying value of their portfolio holdings or NAV. As a result, the trading prices of the Fund’s and the Underlying Fund's shares may deviate significantly from NAV during periods of market volatility, including during periods of significant redemption requests or other unusual market conditions. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S OR THE UNDERLYING FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV. However, because shares can be created and redeemed in Creation Units at NAV, BFA believes that large discounts or premiums to the NAV of the Fund or the Underlying Fund, as applicable, are not likely to be sustained over the long term (unlike shares of many closed-end funds, which frequently trade at appreciable discounts from, and sometimes at premiums to, their NAVs). While the creation/redemption feature is designed to make it more likely that the Fund’s or the Underlying Fund's shares normally will trade on stock exchanges at prices close to the Fund’s or the Underlying Fund's next calculated NAV, exchange prices are not expected to correlate exactly with the NAV due to timing reasons, supply and demand imbalances and other factors. In addition, disruptions to creations and redemptions, including disruptions at market makers, Authorized Participants, or other market participants, and during periods of significant market volatility, may result in trading prices for shares of the Fund or the Underlying Fund that differ significantly from their respective NAV. Authorized Participants may be less willing to create or redeem Fund or Underlying Fund shares if there is a lack of an active market for such shares or its underlying investments, which may contribute to the Fund’s or Underlying Fund's shares trading at a premium or discount to NAV.

Middle Eastern Economic Risk. Many Middle Eastern countries have little or no democratic tradition, and the political and legal systems in such countries may adversely impact the companies in which the Fund or Underlying Fund invests and, as a result, the value of the Fund or Underlying Fund. Middle Eastern governments have exercised and continue to exercise substantial influence over many aspects of the

Table of Contents

private sector. Many economies in the Middle East are highly reliant on income from the sale of oil and natural gas or trade with countries involved in the sale of oil and natural gas, and their economies are therefore vulnerable to changes in the market for oil and natural gas and foreign currency values. As global demand for oil and natural gas fluctuates, many Middle Eastern economies may be significantly impacted. A sustained decrease in commodity prices could have a significant negative impact on all aspects of the economy in the region. Middle Eastern economies may be subject to acts of terrorism, political strife, religious, ethnic or socioeconomic unrest and sudden outbreaks of hostilities with neighboring countries.

Certain Middle Eastern countries have strained relations with other Middle Eastern countries due to territorial disputes, historical animosities, international alliances, religious tensions or defense concerns, which may adversely affect the economies of these countries. Certain Middle Eastern countries experience significant unemployment, as well as widespread underemployment.

Many Middle Eastern countries periodically have experienced political, economic and social unrest as protestors have called for widespread reform. Some of these protests have resulted in a governmental regime change, internal conflict or civil war. If further regime changes were to occur, internal conflict were to intensify, or a civil war were to continue in any of these countries, such instability could adversely affect the economies of Middle Eastern countries in which the Fund or Underlying Fund invests and could decrease the value of the Fund’s or Underlying Fund's investments.

Non-U.S. Issuers Risk. Securities issued by non-U.S. issuers have different risks from securities issued by U.S. issuers. These risks include differences in accounting, auditing and financial reporting standards, the possibility of expropriation or confiscatory taxation, adverse changes in investment or exchange control regulations, political instability which could affect U.S. investments in non-U.S. countries, uncertainties of transnational litigation, and potential restrictions on the flow of international capital, including the possible seizure or nationalization of the securities issued by non-U.S. issuers held by the Underlying Fund. Non-U.S. issuers may be subject to less governmental regulation than U.S. issuers. Moreover, individual non-U.S. economies may differ favorably or unfavorably from the U.S. economy in such respects as growth of gross domestic product, rate of inflation, capital reinvestment, resource self-sufficiency and balance of payment positions. Unfavorable political, economic or governmental developments in non-U.S. countries could affect the payment of a security’s principal and interest. Securities issued by non-U.S. issuers may also be less liquid than, and more difficult to value than, securities of U.S. issuers. In addition, the value of these securities may fluctuate due to changes in the exchange rate of the issuer’s local currency against the U.S. dollar.

Operational Risk. The Fund and the Underlying Fund are exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund's or the Underlying Fund's service providers, counterparties or other third parties, failed or inadequate processes and technology or systems failures. The Fund, the Underlying Fund and BFA seek to reduce these operational risks through controls and procedures. However, these measures do

Table of Contents

not address every possible risk and may be inadequate to address significant operational risks.

Privatization Risk. Some countries in which the Fund or Underlying Fund invests have privatized, or have begun the process of privatizing, certain entities and industries. Newly privatized companies may face strong competition from government-sponsored competitors that have not been privatized. In some instances, investors in newly privatized entities have suffered losses due to the inability of the newly privatized entities to adjust quickly to a competitive environment or changing regulatory and legal standards or, in some cases, due to re-nationalization of such privatized entities. There is no assurance that similar losses will not recur.

Reliance on Trading Partners Risk. The economies of many countries or regions in which the Fund or Underlying Fund invests are highly dependent on trade with certain key trading partners. Reduction in spending on products and services by these key trading partners, institution of tariffs or other trade barriers or a slowdown in the economies of key trading partners may adversely affect the performance of any company in which the Fund or Underlying Fund invests and have a material adverse effect on the Fund’s or Underlying Fund's performance.

Risk of Investing in Emerging Markets. Investments in emerging market issuers are subject to a greater risk of loss than investments in issuers located or operating in more developed markets. This is due to, among other things, the potential for greater market volatility, lower trading volume, higher levels of inflation, political and economic instability, greater risk of a market shutdown and more governmental limitations on foreign investments in emerging market countries than are typically found in more developed markets. Companies in many emerging markets are not subject to the same degree of regulatory requirements, accounting standards or auditor oversight as companies in more developed countries, and as a result, information about the securities in which the Fund or the Underlying Fund invests may be less reliable or complete. Moreover, emerging markets often have less reliable securities valuations and greater risks associated with custody of securities than developed markets. There may be significant obstacles to obtaining information necessary for investigations into or litigation against companies and shareholders may have limited legal remedies.

Table of Contents

In addition, emerging markets often have greater risk of capital controls through such measures as taxes or interest rate control than developed markets. Certain emerging market countries may also lack the infrastructure necessary to attract large amounts of foreign trade and investment. Local securities markets in emerging market countries may trade a small number of securities and may be unable to respond effectively to changes in trading volume, potentially making prompt liquidation of holdings difficult or impossible at times. Settlement procedures in emerging market countries are frequently less developed and reliable than those in the U.S. (and other developed countries). In addition, significant delays may occur in certain markets in registering the transfer of securities. Settlement or registration problems may make it more difficult for the Fund or Underlying Fund to value its portfolio securities and could cause the Fund or Underlying Fund to miss attractive investment opportunities.

Investing in emerging market countries involves a higher risk of loss due to expropriation, nationalization, confiscation of assets and property or the imposition of restrictions on foreign investments and on repatriation of capital invested in certain emerging market countries.

Risk of Investing in Saudi Arabia. The ability of foreign investors (such as the Fund and Underlying Fund) to invest in the securities of Saudi Arabian issuers is relatively new. Such ability could be restricted by the Saudi Arabian government at any time, and unforeseen risks could materialize with respect to foreign ownership in such securities. In addition, the Saudi Arabian government places investment limitations on the ownership of Saudi Arabian issuers by foreign investors, including a limitation on the Fund’s and Underlying Fund's ownership of any single issuer listed on the Saudi Arabian Stock Exchange, which may prevent the Fund and Underlying Fund from investing in accordance with its strategy and contribute to tracking error against the Underlying Index. Saudi Arabia is highly reliant on income from the sale of petroleum and trade with other countries involved in the sale of petroleum, and its economy is therefore vulnerable to changes in foreign currency values and the market for petroleum. As global demand for petroleum fluctuates, Saudi Arabia may be significantly impacted. Like most Middle Eastern governments, the government of Saudi Arabia exercises substantial influence over many aspects of the private sector. Although liberalization in the wider economy is underway, in many areas it has lagged significantly: restrictions on foreign ownership persist, and the government has an ownership stake in many key industries. The situation is exacerbated by the fact that Saudi Arabia is governed by an absolute monarchy. Saudi Arabia has historically experienced strained relations with economic partners worldwide, including other countries in the Middle East due to geopolitical events. Governmental actions in the future could have a significant effect on economic conditions in Saudi Arabia, which could affect private sector companies and the Fund and Underlying Fund, as well as the value of securities in the Fund’s or Underlying Fund's portfolio. Any economic sanctions on Saudi Arabian individuals or Saudi Arabian corporate entities, or even the threat of sanctions, may result in the decline of the value and liquidity of Saudi Arabian securities, a weakening of the Saudi riyal or other adverse consequences to the Saudi Arabian economy. In addition, Saudi Arabia’s economy relies heavily on cheap, foreign labor, and changes in the availability of this labor supply could have an adverse effect on the economy.

Table of Contents

Investments in the securities of Saudi Arabian issuers involve risks not typically associated with investments in securities of issuers in more developed countries that may negatively affect the value of the Fund’s or Underlying Fund's investments. Such heightened risks may include, among others, expropriation and/or nationalization of assets, restrictions on and government intervention in international trade, confiscatory taxation, political instability, including authoritarian and/or military involvement in governmental decision making, armed conflict, crime and instability as a result of religious, ethnic and/or socioeconomic unrest. Although the political situation in Saudi Arabia is largely stable, Saudi Arabia has historically experienced political instability, and there remains the possibility that instability in the larger Middle East region could adversely impact the economy of Saudi Arabia. Political instability in the larger Middle East region has caused significant disruptions to many industries. Continued political and social unrest in these areas may negatively affect the value of securities in the Fund’s or Underlying Fund's portfolio.

Security Risk. Some geographic areas in which the Fund or Underlying Fund invests have experienced acts of terrorism and strained international relations due to territorial disputes, historical animosities, defense concerns and other security concerns. These situations may cause uncertainty in the markets of these geographic areas and may adversely affect their economies.

Table of Contents

rapidly decline and performance may be negatively impacted. Any resulting liquidation of the Fund could cause the Fund to incur elevated transaction costs for the Fund and negative tax consequences for its shareholders.

Sovereign and Quasi-Sovereign Obligations Risk. An investment in sovereign and quasi-sovereign debt obligations involves special risks not present in corporate debt obligations. Sovereign debt includes securities issued by or guaranteed by a sovereign government. The issuer of the sovereign debt that controls the repayment of the debt may be unable or unwilling to repay principal or interest when due, and the Fund or the Underlying Fund may have limited recourse in the event of a default. Similar to other issuers, changes to the financial condition or credit rating of a government may cause the value of a sovereign debt obligation, including U.S. Treasury obligations, to decline. During periods of economic uncertainty, the market prices of sovereign debt may be more volatile than prices of debt obligations and may affect the Fund's or Underlying Fund's NAV. Quasi-sovereign debt obligations are typically less liquid and less standardized than sovereign debt obligations. These risks may be more pronounced with respect to non-U.S. sovereign debt than with respect to U.S. government debt. In the past, certain emerging market countries have encountered difficulties in servicing their debt obligations, withheld payments of principal and interest and declared moratoria on the payment of principal and interest on their sovereign debts.

Structural Risk. Certain political, economic, legal and currency risks could contribute to a high degree of price volatility in the equity markets of some of the countries in which the Fund or Underlying Fund may invest and could adversely affect investments in the Fund or the Underlying Fund.

Political and Social Risk. Disparities of wealth, the pace and success of democratization and ethnic, religious and racial disaffection, among other factors, may exacerbate social unrest, violence and labor unrest in some of the countries in which the Fund or Underlying Fund may invest. Unanticipated or sudden political or social developments may result in sudden and significant investment losses.

Economic Risk. Some countries in which the Fund or Underlying Fund may invest may experience economic instability, including instability resulting from substantial rates of inflation or significant devaluations of their currency, or economic recessions, which would have a negative effect on the economies and securities markets of their economies. Some of these countries may also impose restrictions on the exchange or export of currency or adverse currency exchange rates and may be characterized by a lack of available currency hedging instruments.

Expropriation Risk. Investments in certain countries in which the Fund or Underlying Fund may invest may be subject to loss due to expropriation or nationalization of assets and property or the imposition of restrictions on foreign investments and repatriation of capital.

Large Government Debt Risk. Chronic structural public sector deficits in some countries in which the Fund or Underlying Fund may invest may adversely impact securities held by the Fund or the Underlying Fund.

Tax Risk. The Fund invests in derivatives. The federal income tax treatment of a derivative may not be as favorable as a direct investment in an underlying asset.

Table of Contents

Derivatives may produce taxable income and taxable realized gain. Derivatives may adversely affect the timing, character and amount of income the Fund realizes from its investments. As a result, a larger portion of the Fund’s distributions may be treated as ordinary income rather than as capital gains. In addition, certain derivatives are subject to mark-to-market or straddle provisions of the Internal Revenue Code. If such provisions are applicable, there could be an increase (or decrease) in the amount of taxable dividends paid by the Fund. Income from swaps is generally taxable. In addition, the tax treatment of certain derivatives, such as swaps, is unsettled and may be subject to future legislation, regulation or administrative pronouncements issued by the IRS. Because the Fund invests in the Underlying Fund, the Fund’s realized losses on sales of shares of the Underlying Fund may be indefinitely or permanently deferred as “wash sales.” Distributions of short-term capital gains by the Underlying Fund will be recognized as ordinary income by the Fund and would not be offset by the Fund’s capital loss carryforwards, if any. Capital loss carryforwards of the Underlying Fund, if any, would not offset net capital gains of the Fund. Each of these effects is caused by the Fund’s investment in the Underlying Fund and may result in distributions to Fund shareholders being of higher magnitude and less likely to qualify for lower capital gain tax rates than if the Fund were to invest directly in the securities and other instruments composing its portfolio.

Tracking Error Risk. The Fund may be subject to “tracking error,” which is the divergence of the Fund’s performance from that of the Underlying Index. Tracking error may occur because of differences between the securities and other instruments held in the Fund’s portfolio and those included in the Underlying Index, pricing differences (including, as applicable, differences between a security’s price at the local market close and the Fund's or an Underlying Fund's valuation of a security at the time of calculation of the Fund's or Underlying Fund's NAV, respectively), transaction costs incurred by the Fund, the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be heightened during times of increased market volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX ETFs THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN SWAP CONTRACTS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

U.S. Economic Risk. The U.S. is a significant, and in some cases the most significant, trading partner of, or foreign investor in, certain countries in which the Fund or Underlying Fund invests. As a result, economic conditions of such countries may be particularly affected by changes in the U.S. economy. A decrease in U.S. imports or exports, new trade and financial regulations or tariffs, changes in the U.S. dollar exchange rate or an economic slowdown in the U.S. may have a material adverse effect on the economic conditions of such countries and, as a result, securities to which the Fund or Underlying Fund has exposure.

Table of Contents

Valuation Risk. The price the Fund and the Underlying Fund could receive upon the sale of a security or unwind of a financial instrument or other asset may differ from the Fund's or the Underlying Fund's valuation of the security, instrument or other asset, particularly for securities or other instruments that trade in low volume or volatile markets or that are valued using a fair value methodology as a result of trade suspensions or for other reasons. Because non-U.S. exchanges may be open on days when the Underlying Fund does not price its shares, the value of the securities or other instruments in the Underlying Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund’s or the Underlying Fund's shares. In addition, for purposes of calculating the Fund's NAV, the value of assets denominated in non-U.S. currencies is translated into U.S. dollars at the prevailing market rates. This translation may result in a difference between the prices used to calculate the Fund's NAV and the prices used by the Underlying Index, which, in turn, could result in a difference between the Fund's performance and the performance of the Underlying Index. Authorized Participants who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

A Further Discussion of Other Risks

African Economic Risk. Investing in the economies of African countries involves risks not typically associated with investments in securities of issuers in more developed economies, countries or geographic regions that may negatively affect the value of investments in the Fund. Such heightened risks include, among others, expropriation and/or nationalization of assets, restrictions on and government intervention in international trade, confiscatory taxation, political instability, including authoritarian and/or military involvement in governmental decision making, armed conflict, civil war, and social instability as a result of religious, ethnic and/or socioeconomic unrest or widespread outbreaks of disease.

The securities markets in Africa are underdeveloped and are often considered to be less correlated to global economic cycles than markets located in more developed economies, countries or geographic regions. Securities markets in African countries are subject to greater risks associated with market volatility, lower market capitalization, lower trading volume, illiquidity, inflation, greater price fluctuations, uncertainty regarding the existence of trading markets, governmental control and heavy regulation of labor and industry. Moreover, trading on African securities markets may be suspended altogether.

Certain governments in African countries may restrict or control to varying degrees the ability of foreign investors to invest in securities of issuers located or operating in

Table of Contents

those countries. Moreover, certain countries in Africa may require governmental approval or special licenses prior to investment by foreign investors; may limit the amount of investment by foreign investors in a particular industry and/or issuer; may limit such foreign investment to a certain class of securities of an issuer that may have less advantageous rights than the classes available for purchase by domestic investors of those countries; and/or may impose additional taxes on foreign investors. These factors, among others, make investing in issuers located or operating in countries in Africa significantly riskier than investing in issuers located or operating in more developed countries.

Eastern European Economic Risk. An investment in issuers located or operating in Eastern Europe may subject the Fund or Underlying Fund to legal, regulatory, political, currency, security and economic risks specific to Eastern Europe. Economies of certain Eastern European countries rely heavily on the export of commodities, including oil, gas, and certain metals. As a result, such economies may be impacted by international commodity prices and are particularly vulnerable to global demand for these products. Geopolitical events including armed conflict or war, acts of terrorism, and other instability in certain Eastern European countries may cause uncertainty in their financial markets and adversely affect the performance of the issuers to which the Fund or Underlying Fund has exposure. The securities markets in some Eastern European countries are substantially smaller and less developed, with less government supervision and regulation of stock exchanges, and may be less liquid and more volatile than securities markets in the U.S. or Western European countries. In addition, investing in securities of issuers located or operating in Eastern Europe may involve:

■	The risk of delays in settling portfolio transactions and the risk of loss arising out of the system of share registration and custody used in certain Eastern European countries;
■	Risks in connection with the maintenance of the Fund's or Underlying Fund's portfolio securities and cash with foreign sub-custodians and securities depositories, including the risk that appropriate sub-custody arrangements will not be available to the Fund or Underlying Fund;
■	The risk that the Fund's or Underlying Fund's ownership rights in portfolio securities could be lost through fraud or negligence as a result of the fact that ownership in shares of certain Eastern European companies is recorded by the companies themselves and by registrars, rather than a central registration system;

Table of Contents

■	The risk that the Fund or Underlying Fund may not be able to pursue claims on behalf of its shareholders because of the system of share registration and custody, and because certain Eastern European banking institutions and registrars are not guaranteed by their respective governments; and
■	Risks in connection with Eastern European countries' dependence on the economic health of Western European countries and the EU as a whole.

Other risks related to investing in securities of issuers located or operating in Eastern Europe include: the potential absence of legal structures governing private and foreign investments and private property; the possibility of the loss of all or a substantial portion of the Fund’s or Underlying Fund's assets invested in issuers located or operating in Eastern Europe as a result of expropriation; and certain national policies which may restrict the Fund’s or Underlying Fund's investment opportunities, including, without limitation, restrictions on investing in issuers or industries deemed sensitive to relevant national interests. In addition, Eastern European securities markets are particularly sensitive to social, political, economic, and currency events in Russia and may suffer heavy losses as a result of their trading and investment links to the Russian economy and currency.

LIBOR Replacement Risk. As part of the phase-out of the use of LIBOR, the rate’s administrator, ICE Benchmark Administration Limited (“IBA”), discontinued two USD LIBOR settings immediately after publication on December 31, 2021. The United Kingdom’s Financial Conduct Authority (“FCA”), which regulates LIBOR, and IBA previously announced that a majority of USD LIBOR settings will no longer be published after June 30, 2023. While the FCA is requiring the IBA to publish certain LIBOR settings, potentially to include USD settings, on a “synthetic” basis, the “synthetic” methodology is not based on panel bank contributions and is not intended to be representative of the interest rates in the underlying market. The Fund may have investments linked to other interbank offered rates, such as the Euro Overnight Index Average (“EONIA”), which may also cease to be published. Various financial industry groups continue planning for the transition away from LIBOR, but there are challenges to converting certain securities and transactions to a new reference rate, such as the Secured Overnight Financing Rate (“SOFR”), which is intended to replace USD LIBOR. For example, at times, SOFR has proven to be more volatile than the 3-month USD LIBOR. Working groups and regulators in other countries have suggested other alternatives for their markets, including the Sterling Overnight Interbank Average Rate (“SONIA”) in England.

Table of Contents

may contemplate a scenario where LIBOR is no longer available by providing for an alternative rate-setting methodology, there may be significant uncertainty regarding the effectiveness of any such alternative methodologies to replicate LIBOR. Not all existing LIBOR-based instruments may have alternative rate-setting provisions and there remains uncertainty regarding the willingness and ability of issuers to add alternative rate-setting provisions in certain existing instruments. Global regulators have advised market participants to cease entering into new contracts using LIBOR as a reference rate, and it is possible that investments in LIBOR-based instruments could invite regulatory scrutiny. In addition, a liquid market for newly issued instruments that use a reference rate other than LIBOR still may be developing. There may also be challenges for the Fund to enter into hedging transactions against such newly issued instruments until a market for such hedging transactions develops. All of the aforementioned may adversely affect the Fund’s performance or NAV.

Money Market Instruments Risk. The value of money market instruments may be affected by changing interest rates and by changes in the credit ratings of the investments. If a significant amount of the Fund's assets are invested in money market instruments, it will be more difficult for the Fund to achieve its investment objective. An investment in a money market fund is not insured or guaranteed by the FDIC or any other government agency. It is possible to lose money by investing in a money market fund. Money market funds other than government money market funds or retail money market funds “float” their NAV instead of using a stable $1.00 per share price.

The U.S. is Canada's and Mexico's largest trading and investment partner. The Canadian and Mexican economies are significantly affected by developments in the U.S. economy. Since the implementation of the North American Free Trade Agreement (“NAFTA”) in 1994 among Canada, the U.S. and Mexico, total merchandise trade among the three countries has increased. However, political developments including the implementation of tariffs by the U.S. and the renegotiation of NAFTA in the form of the United States-Mexico-Canada Agreement (“USMCA”), which replaced NAFTA on July 1, 2020, could negatively affect North America’s economic outlook and, as a result, the value of securities held by the Fund or the Underlying Fund. Policy and legislative changes in one country may have a significant effect on North American markets generally, as well as on the value of certain securities held by the Fund or the Underlying Fund.

Non-U.S. Agency Debt Risk. The Fund or Underlying Fund invests in uncollateralized bonds issued by agencies, subdivisions or instrumentalities of foreign governments. Bonds issued by these foreign government agencies, subdivisions or instrumentalities are generally backed only by the creditworthiness and reputation of the entities issuing the bonds and may not be backed by the full faith and credit of the foreign government. Moreover, a foreign government that explicitly provides its full faith and credit to a particular entity may be, due to changed circumstances, unable or unwilling to actually provide that support. If a non-U.S. agency is unable to meet its obligations,

Table of Contents

the performance of the Fund or Underlying Fund will be adversely impacted. A non-U.S. agency’s operations and financial condition are influenced by the foreign government’s economic and other policies. Changes to the financial condition or credit rating of a foreign government may cause the value of debt issued by that particular foreign government’s agencies, subdivisions or instrumentalities to decline. During periods of economic uncertainty, the trading of non-U.S. agency bonds may be less liquid while market prices may be more volatile than prices of U.S. agency bonds. Additional risks associated with non-U.S. agency investing include differences in accounting, auditing and financial reporting standards, adverse changes in investment or exchange control regulations, political instability, which could affect U.S. investments in foreign countries, and potential restrictions of the flow of international capital.

Threshold/Underinvestment Risk. If certain aggregate and/or fund-level ownership thresholds are reached through transactions undertaken by BFA, its affiliates or the Fund, or as a result of third-party transactions or actions by an issuer or regulator, the ability of BFA and its affiliates on behalf of clients (including the Fund) to purchase or dispose of investments, or exercise rights or undertake business transactions, may be restricted by regulation or otherwise impaired. The capacity of the Fund to make investments in certain securities may be affected by the relevant threshold limits, and such limitations may have adverse effects on the liquidity and performance of the Fund’s portfolio holdings.

Table of Contents

proprietary accounts and for client accounts (including the Fund) that may not be exceeded without the grant of a license or other regulatory or corporate consent or, if exceeded, may cause BFA and its affiliates, the Fund or other client accounts to suffer disadvantages or business restrictions.

Portfolio Holdings Information

A Further Discussion of Principal Investment Strategies

Overview

The Fund allocates and reallocates its assets among direct investments in securities and other instruments, and in investments in the Underlying Fund consistent with the allocation and reallocation of securities in the Underlying Index as determined by the Index Provider. The Fund intends to invest a substantial portion of its assets in one underlying fund, the Underlying Fund. The Fund seeks to track the interest rate hedging component of the Underlying Index primarily through the use of positions in interest rate swaps (i.e., contracts in which the Fund makes fixed-rate payments while receiving floating-rate payments based on a reference rate).

The Underlying Fund

The Underlying Fund seeks investment results that correspond generally to the price and yield performance, before fees and expenses, of the J.P. Morgan EMBI^®Global Core Index. The J.P. Morgan EMBI^®Global Core Index is a broad, diverse U.S. dollar-denominated, emerging markets debt benchmark which tracks the total return of actively traded external debt instruments in emerging market countries. The methodology is designed to distribute the weight of each country within the J.P. Morgan EMBI^®Global Core Index by limiting the weights of countries with higher debt outstanding and reallocating this excess to countries with lower debt outstanding. The

Table of Contents

J.P. Morgan EMBI^®Global Core Index is a trademark of and is maintained by JPMorgan Chase & Co. (“J.P. Morgan”) and has been licensed for use for certain purposes by BFA or its affiliates. J.P. Morgan makes no representation or warranty, expressed or implied, regarding the advisability of investing in the Underlying Fund.

Management

Investment Adviser. As investment adviser, BFA has overall responsibility for the general management and administration of the Fund. BFA provides an investment program for the Fund and manages the investment of the Fund’s assets. In managing the Fund, BFA may draw upon the trading, research and expertise of its asset management affiliates for portfolio decisions and management with respect to portfolio securities. In seeking to achieve the Fund's investment objective, BFA uses teams of portfolio managers, investment strategists and other investment specialists. This team approach brings together many disciplines and leverages BFA’s extensive resources.

For its investment advisory services to the Fund, BFA is paid a management fee from the Fund based on a percentage of the Fund's average daily net assets, at the annual rate of 0.75%. BFA has contractually agreed to waive a portion of its management fees so that the Fund’s total annual fund operating expenses after fee waiver are equal to the Acquired Fund Fees and Expenses attributable to the Fund’s investment in EMB, after taking into account any fee waivers by EMB, plus 0.10% through February 28, 2027. The contractual waiver may be terminated prior to February 28, 2027 only upon written agreement of the Trust and BFA. In addition, BFA may from time to time voluntarily waive and/or reimburse fees or expenses in order to limit total annual fund operating expenses (excluding Acquired Fund Fees and Expenses, if any). Any such voluntary waiver or reimbursement may be eliminated by BFA at any time.

BFA is located at 400 Howard Street, San Francisco, CA 94105. It is an indirect wholly-owned subsidiary of BlackRock, Inc. (“BlackRock”). As of December 31, 2021, BFA and

Table of Contents

its affiliates provided investment advisory services for assets in excess of $10.01 trillion. BFA and its affiliates trade and invest for their own accounts in the actual securities and types of securities in which the Fund may also invest, which may affect the price of such securities. BFA is considered a “commodity pool operator” with respect to the Fund under the CEA and is therefore subject to regulation by the SEC and the CFTC with respect to the Fund.

Table of Contents

follow investment programs similar to that of the Fund. BFA and its Affiliates are involved worldwide with a broad spectrum of financial services and asset management activities and may engage in the ordinary course of business in activities in which their interests or the interests of their clients may conflict with those of the Fund. BFA or one or more Affiliates act, or may act, as an investor, research provider, investment manager, commodity pool operator, commodity trading advisor, financier, underwriter, adviser, trader, lender, index provider, agent and/or principal, and have other direct and indirect interests in securities, currencies, commodities, derivatives and other instruments in which the Fund may directly or indirectly invest. The Fund may invest in securities of, or engage in other transactions with, companies with which an Affiliate has significant debt or equity investments or other interests. The Fund may also invest in issuances (such as structured notes) by entities for which an Affiliate provides and is compensated for cash management services relating to the proceeds from the sale of such issuances. The Fund also may invest in securities of, or engage in other transactions with, companies for which an Affiliate provides or may in the future provide research coverage. An Affiliate may have business relationships with, and purchase or distribute or sell services or products from or to, distributors, consultants or others who recommend the Fund or who engage in transactions with or for the Fund, and may receive compensation for such services. BFA or one or more Affiliates may engage in proprietary trading and advise accounts and funds that have investment objectives similar to those of the Fund and/or that engage in and compete for transactions in the same types of securities, currencies and other instruments as the Fund. This may include transactions in securities issued by other open-end and closed-end investment companies (which may include investment companies that are affiliated with the Fund and BFA, to the extent permitted under the Investment Company Act of 1940, as amended (the “1940 Act”)). The trading activities of BFA and these Affiliates are carried out without reference to positions held directly or indirectly by the Fund and may result in BFA or an Affiliate having positions in certain securities that are senior or junior to, or have interests different from or adverse to, the securities that are owned by the Fund.

Table of Contents

The Fund's activities may be limited because of regulatory restrictions applicable to BFA or one or more Affiliates and/or their internal policies designed to comply with such restrictions.

Shareholder Information

Table of Contents

volume and market liquidity (which is often the case for funds that are newly launched or small in size). The Fund's spread may also be impacted by the liquidity or illiquidity of the underlying securities held by the Fund, particularly for newly launched or smaller funds or in instances of significant volatility of the underlying securities.

The Board has adopted a policy of not monitoring for frequent purchases and redemptions of Fund shares (“frequent trading”) that appear to attempt to take advantage of a potential arbitrage opportunity presented by a lag between a change in the value of the Fund’s portfolio securities after the close of the primary markets for the Fund’s portfolio securities and the reflection of that change in the Fund’s NAV (“market timing”), because the Fund sells and redeems its shares directly through transactions that are in-kind and/or for cash, subject to the conditions described below under Creations and Redemptions. The Board has not adopted a policy of monitoring for other frequent trading activity because shares of the Fund are listed for trading on a national securities exchange.

Section 12(d)(1) of the 1940 Act generally restricts investments by investment companies, including foreign and unregistered investment companies, in the securities of other investment companies. For example, a registered investment company (the “Acquired Fund”), such as the Fund, may not knowingly sell or otherwise dispose of any security issued by the Acquired Fund to any investment company (the “Acquiring Fund”) or any company or companies controlled by the Acquiring Fund if, immediately after such sale or disposition: (i) more than 3% of the total outstanding voting stock of the Acquired Fund is owned by the Acquiring Fund and any company or companies controlled by the Acquiring Fund or (ii) more than 10% of the total outstanding voting stock of the Acquired Fund is owned by the Acquiring Fund and other investment companies and companies controlled by them. Although SEC rules may permit registered investment companies and unit investment trusts (“Investing Funds”) that enter into an investment agreement with the Trust to invest in iShares funds beyond the limits set forth in Section 12(d)(1) of the 1940 Act subject to certain terms and conditions, the Fund does not permit such investments. Accordingly, Investing Funds must adhere to the limits set forth in Section 12(d)(1) of the 1940 Act when investing in the Fund. In addition, foreign investment companies are permitted to invest in the Fund only up to the limits set forth in Section 12(d)(1), subject to any applicable SEC no-action relief.

Table of Contents

clearing corporations and other institutions that directly or indirectly maintain a custodial relationship with DTC. As a beneficial owner of shares, you are not entitled to receive physical delivery of stock certificates or to have shares registered in your name, and you are not considered a registered owner of shares. Therefore, to exercise any right as an owner of shares, you must rely upon the procedures of DTC and its participants. These procedures are the same as those that apply to any other securities that you hold in book-entry or “street name” form.

Share Prices. The trading prices of the Fund’s shares in the secondary market generally differ from the Fund’s daily NAV and are affected by market forces such as the supply of and demand for ETF shares and underlying securities held by the Fund, economic conditions and other factors.

Determination of Net Asset Value. The NAV of the Fund normally is determined once daily Monday through Friday, generally as of the close of regular trading hours of the New York Stock Exchange (“NYSE”) (normally 4:00 p.m., Eastern time) on each day that the NYSE is open for trading, based on prices at the time of closing, provided that any Fund assets or liabilities denominated in currencies other than the U.S. dollar are translated into U.S. dollars at the prevailing market rates on the date of valuation as quoted by one or more data service providers. The NAV of the Fund is calculated by dividing the value of the net assets of the Fund (i.e., the value of its total assets, which includes the value of the Underlying Fund shares in which the Fund invests, less total liabilities) by the total number of outstanding shares of the Fund, generally rounded to the nearest cent.

The value of the securities and other assets and liabilities held by the Fund is determined pursuant to valuation policies and procedures approved by the Board.

Generally, trading in non-U.S. securities and money market instruments is substantially completed each day at various times prior to the close of regular trading hours of the NYSE. The values of such securities used in computing the NAV of the Fund are determined as of such times.

Table of Contents

or other reasons, if a market quotation differs significantly from recent price quotations or otherwise no longer appears to reflect fair value, where the security or other asset or liability is thinly traded, when there is a significant event subsequent to the most recent market quotation, or if the trading market on which a security is listed is suspended or closed and no appropriate alternative trading market is available. A “significant event” is deemed to occur if BFA determines, in its reasonable business judgment prior to or at the time of pricing the Fund’s assets or liabilities, that the event is likely to cause a material change to the last exchange closing price or closing market price of one or more assets held by, or liabilities of, the Fund.

Dividends and Distributions

General Policies. Dividends from net investment income, if any, generally are declared and paid at least once a year by the Fund. Distributions of net realized securities gains, if any, generally are declared and paid once a year, but the Trust may make distributions on a more frequent basis for the Fund. The Trust reserves the right to declare special distributions if, in its reasonable discretion, such action is necessary or advisable to preserve its status as a regulated investment company or to avoid imposition of income or excise taxes on undistributed income or realized gains.

Table of Contents

receive certain regulatory or accounting treatment. You should consult your own tax professional about the tax consequences of an investment in shares of the Fund.

You may lose the ability to use foreign tax credits passed through by the Fund if your Fund shares are loaned out pursuant to a securities lending agreement.

Table of Contents

If you are neither a resident nor a citizen of the U.S. or if you are a non-U.S. entity (other than a pass-through entity to the extent owned by U.S. persons), the Fund’s ordinary income dividends (which include distributions of net short-term capital gains) will generally be subject to a 30% U.S. federal withholding tax, unless a lower treaty rate applies provided that withholding tax will generally not apply to any gain or income realized by a non-U.S. shareholder in respect of any distributions of long-term capital gains or upon the sale or other disposition of shares of the Fund.

Separately, a 30% withholding tax is currently imposed on U.S.-source dividends, interest and other income items paid to (i) foreign financial institutions, including non-U.S. investment funds, unless they agree to collect and disclose to the U.S. Internal Revenue Service (“IRS”) information regarding their direct and indirect U.S. account holders and (ii) certain other foreign entities, unless they certify certain information regarding their direct and indirect U.S. owners. To avoid withholding, foreign financial institutions will need to (i) enter into agreements with the IRS that state that they will provide the IRS information, including the names, addresses and taxpayer identification numbers of direct and indirect U.S. account holders; comply with due diligence procedures with respect to the identification of U.S. accounts; report to the IRS certain information with respect to U.S. accounts maintained, agree to withhold tax on certain payments made to non-compliant foreign financial institutions or to account holders who fail to provide the required information; and determine certain other information concerning their account holders, or (ii) in the event that an applicable intergovernmental agreement and implementing legislation are adopted, provide local revenue authorities with similar account holder information. Other foreign entities may need to report the name, address, and taxpayer identification number of each substantial U.S. owner or provide certifications of no substantial U.S. ownership, unless certain exceptions apply.

Table of Contents

capital gain dividends, are included in “net investment income” for purposes of the 3.8% U.S. federal Medicare contribution tax mentioned above.

Table of Contents

will be sold in transactions that would be exempt from registration under the Securities Act of 1933, as amended (the “1933 Act”). Further, an Authorized Participant that is not a “qualified institutional buyer,” as such term is defined in Rule 144A under the 1933 Act, will not be able to receive restricted securities eligible for resale under Rule 144A.

Table of Contents

Distribution

Table of Contents

Financial Highlights

Financial Highlights
(For a share outstanding throughout each period)

	iShares Interest Rate Hedged Emerging Markets Bond ETF
	Year Ended 10/31/21	Year Ended 10/31/20	Year Ended 10/31/19	Year Ended 10/31/18	Year Ended 10/31/17
Net asset value, beginning of year	$22.53	$24.44	$25.28	$26.44	$25.06
Net investment income^(a)	0.83	0.91	1.42	1.06	1.11
Net realized and unrealized gain (loss)^(b)	0.86	(2.10)	(1.00)	(1.19)	1.24
Net increase (decrease) from investment operations	1.69	(1.19)	0.42	(0.13)	2.35
Distributions^(c)
From net investment income	(0.60)	(0.72)	(1.26)	(1.03)	(0.97)
Total distributions	(0.60)	(0.72)	(1.26)	(1.03)	(0.97)
Net asset value, end of year	$23.62	$22.53	$24.44	$25.28	$26.44
Total Return^(d)
Based on net asset value	7.52%	(4.84)%	1.72%	(0.51)%	9.57%
Ratios to Average Net Assets
Total expenses^(e)	0.75%	0.75%	0.75%	0.75%	0.75%
Total expenses after fees waived^(e)	0.10%	0.10%	0.10%	0.10%	0.10%
Net investment income	3.50%	3.97%	5.71%	4.07%	4.32%
Supplemental Data
Net assets, end of year (000)	$7,086	$5,633	$7,333	$13,902	$2,644
Portfolio turnover rate^(f)(g)	5%	4%	3%	0%^(h)	2%
^(a) Based on average shares outstanding.
^(b) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.
^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.
^(d) Where applicable, assumes the reinvestment of distributions.
^(e) The Fund indirectly bears its proportionate share of fees and expenses incurred by the underlying fund in which the Fund is invested (“acquired fund fees and expenses”). This ratio does not include these acquired fund fees and expenses.
^(f) Portfolio turnover rate excludes in-kind transactions.
^(g) Portfolio turnover rate excludes the portfolio activity of the underlying fund in which the Fund is invested. See the underlying fund's financial highlights for its respective portfolio turnover rates.
^(h) Rounds to less than 1%.

Table of Contents

Index Provider

Table of Contents

Disclaimers

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

Want to know more?

iShares.com | 1-800-474-2737

If you have any questions about the Trust or shares of the Fund or you wish to obtain the SAI, Semi-Annual or Annual Report free of charge, please:

Call:	1-800-iShares or 1-800-474-2737 (toll free) Monday through Friday, 8:30 a.m. to 6:30 p.m. (Eastern time)
Email:	iSharesETFs@blackrock.com
Write:	c/o BlackRock Investments, LLC 1 University Square Drive, Princeton, NJ 08540

Investment Company Act File No.: 811-22649

IS-P-EMBH-0322

	March 1, 2022

2022 Prospectus

iShares U.S. ETF Trust

•	iShares Interest Rate Hedged High Yield Bond ETF \| HYGH \| NYSE ARCA

Table of Contents

Fund Overview	S-1
More Information About the Fund	1
A Further Discussion of Principal Risks	2
A Further Discussion of Other Risks	18
Portfolio Holdings Information	25
A Further Discussion of Principal Investment Strategies	25
Management	26
Shareholder Information	29
Distribution	37
Financial Highlights	38
Index Provider	39
Disclaimers	40

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

iSHARES^® INTEREST RATE HEDGED HIGH YIELD BOND ETF

Ticker: HYGH

Stock Exchange: NYSE Arca

Investment Objective

The iShares Interest Rate Hedged High Yield Bond ETF (the “Fund”) seeks to track the investment results of an index designed to mitigate the interest rate risk of a portfolio composed of U.S. dollar-denominated, high yield corporate bonds.

Fees and Expenses

The following table describes the fees and expenses that you will incur if you buy, hold and sell shares of the Fund. The investment advisory agreement between iShares U.S. ETF Trust (the “Trust”) and BlackRock Fund Advisors (“BFA”) (the “Investment Advisory Agreement”) provides that BFA will pay all operating expenses of the Fund, except: (i) the management fees, (ii) interest expenses, (iii) taxes, (iv) expenses incurred with respect to the acquisition and disposition of portfolio securities and the execution of portfolio transactions, including brokerage commissions, (v) distribution fees or expenses, and (vi) litigation expenses and extraordinary expenses. The Fund may incur “Acquired Fund Fees and Expenses.” Acquired Fund Fees and Expenses reflect the Fund's pro rata share of the fees and expenses incurred by investing in other investment companies. The impact of Acquired Fund Fees and Expenses is included in the total returns of the Fund. Acquired Fund Fees and Expenses are not included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Fund's prospectus (the “Prospectus”). BFA, the investment adviser to the Fund, has contractually agreed to waive a portion of its management fees so that the Fund’s total annual fund operating expenses after fee waiver are equal to the Acquired Fund Fees and Expenses attributable to the Fund’s investment in the iShares iBoxx $ High Yield Corporate Bond ETF (“HYG” or the “Underlying Fund”), after taking into account any fee waivers by HYG, plus 0.05% through February 28, 2027. The contractual waiver may be terminated prior to February 28, 2027 only upon written agreement of the Trust and BFA.

You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Annual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investments)
Management Fees	Distribution and Service (12b-1) Fees	Other Expenses¹	Acquired Fund Fees and Expenses	Total Annual Fund Operating Expenses	Fee Waiver	Total Annual Fund Operating Expenses After Fee Waiver
0.65%	None	0.00%	0.47%	1.12%	(0.60)%	0.52%

¹	The amount rounded to 0.00%.

S-1

Table of Contents

1 Year		3 Years		5 Years		10 Years
$53		$167		$291		$1059

Portfolio Turnover. The Fund or the Underlying Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate for the Fund or the Underlying Fund may indicate higher transaction costs and may cause the Fund or the Underlying Fund to incur increased expenses. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example (except costs to the Underlying Fund included as part of Acquired Fund Fees and Expenses), affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 1% of the average value of its portfolio. To the extent the Underlying Fund incurs costs from high portfolio turnover, such costs may have a negative effect on the performance of the Fund.

Principal Investment Strategies

The Fund seeks to track the investment results of the BlackRock Interest Rate Hedged High Yield Bond Index (the “Underlying Index”), which is designed to minimize the interest rate risk of a portfolio composed of U.S. dollar-denominated, high yield corporate bonds (which are considered below investment-grade), represented in the Underlying

Index by the Underlying Fund, by including a series of up to 10 interest rate swap contracts with different maturities (as determined by BlackRock Index Services, LLC (the “Index Provider”)). As of October 31, 2021, the Underlying Index includes approximately 12 components, and the Underlying Fund includes approximately 1,337 components. The Fund invests in U.S. dollar-denominated, high yield corporate bonds primarily through its investment in the Underlying Fund. To be included in the Underlying Fund, bonds must have: (i) an original maturity date of less than 15 years; (ii) at least one year to maturity; and (iii) at least one year and 6 months to maturity for new index insertions. The Fund seeks to track the interest rate hedging component of the Underlying Index primarily through the use of positions in interest rate swaps (i.e., contracts in which the Fund makes fixed-rate payments while receiving floating-rate payments based on a reference rate). The different maturities and weights of the swap contracts included in the Underlying Index are intended to hedge the portfolio’s duration exposure (i.e., sensitivity to changes in interest rates) at key points on the yield curve, as determined by the Index Provider. The Underlying Index includes a fixed number of shares (to be adjusted in the event of any stock splits) of the Underlying Fund, and the Index Provider rebalances the weights of the swap contracts included in the Underlying Index daily. On a monthly basis, the Index Provider will add new swap contracts to the Underlying Index and remove the previous month’s swap contracts. Finally, the Index Provider includes a 5% cash position in the

S-2

Table of Contents

Underlying Index in order to represent the collateral that is required to be kept available for the margin requirements for the swap contracts.

The Fund may also invest in other interest rate futures contracts, including but not limited to, U.S. Treasuries, Eurodollar and Federal Funds futures. The Fund’s interest rate swap and futures positions are not intended to mitigate credit risk or other factors influencing the price of high yield corporate bonds, which may have a greater impact than interest rates.

The CFTC has adopted certain requirements that subject registered investment companies and their advisers to regulation by the CFTC if a registered investment company invests more than a prescribed level of its net asset value in CFTC-regulated futures, options and swaps, or if a registered investment company markets itself as providing investment exposure to such instruments. Due to the Fund’s use or potential use of CFTC-regulated futures, options and swaps above the prescribed levels, it is considered a “commodity pool” and BFA is considered a “commodity pool operator” with respect to the Fund under the Commodity Exchange Act (“CEA”).

positions when markets decline or appear overvalued.

The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of any collateral received).

The Underlying Index is sponsored by the Index Provider, an affiliated person of the Fund and of BFA, the Fund’s investment adviser. The Index Provider determines the composition and relative

S-3

Table of Contents

weightings of the securities in the Underlying Index and publishes information regarding the market value of the Underlying Index.

Summary of Principal Risks

Calculation Methodology Risk. The Underlying Index relies on various sources of information to assess the criteria of issuers included in the Underlying Index , including information that may be based on assumptions and estimates. Neither the Fund nor BFA can offer assurances that the Underlying Index’s calculation methodology or sources of information will provide an accurate assessment of included issuers.

Cash Management Risk. If a significant amount of the Fund’s assets are invested in cash and cash equivalents, it will be more difficult for the Fund to achieve its investment objective. The

S-4

Table of Contents

Fund may underperform other funds that do not similarly invest in cash and cash equivalents for investment purposes and/or to collateralize derivative instruments.

Communication Services Sector Risk. Companies in the communications sector may be affected by industry competition, substantial capital requirements, government regulation, cyclicality of revenues and earnings, obsolescence of communications products and services due to technological advancement, a potential decrease in the discretionary income of targeted individuals and changing consumer tastes and interests.

Consumer Cyclical Industry Risk. Consumer cyclical companies rely heavily on business cycles and

economic conditions. Consumer cyclical companies may be adversely affected by domestic and international economic downturns, changes in exchange and interest rates, competition, consumers’ disposable income and preferences, social trends and marketing campaigns.

Credit Risk. Debt issuers and other counterparties may be unable or unwilling to make timely interest and/or principal payments when due or otherwise honor their obligations. Changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may also adversely affect the value of the Fund’s or Underlying Fund's investment in that issuer. The degree of credit risk depends on an issuer's or counterparty's financial condition and on the terms of an obligation.

Cybersecurity Risk. Failures or breaches of the electronic systems of the Fund or the Underlying Fund, the Fund's or the Underlying Fund's adviser, distributor, or other service providers, market makers, Authorized Participants, hedging counterparties to the Fund or the issuers of securities in which the Fund or the Underlying Fund invests have the ability to cause disruptions, negatively impact the Fund’s business operations and/or potentially result in financial losses to the Fund and its shareholders. While the Fund has established business continuity plans and risk management systems seeking to address system breaches or failures, there are inherent limitations in such plans and systems. Furthermore, the Fund cannot control the cybersecurity plans and systems of the Fund’s Index Provider and other service providers, market makers, Authorized Participants, hedging counterparties to the Fund or

S-5

Table of Contents

issuers of securities in which the Fund or the Underlying Fund invests.

Derivatives Risk. The Fund’s or Underlying Fund's use of derivatives may reduce the Fund’s or Underlying Fund's returns or increase volatility. Volatility is defined as the characteristic of a security, a currency, an index or a market to fluctuate significantly in price within a short time period. Derivatives may also be subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. Counterparty risk for over-the-counter (“OTC”) derivatives is generally higher than that for derivatives traded on an exchange or through a clearing house. A risk of the Fund’s or Underlying Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the value of the underlying asset, the performance of the asset class to which the Fund or Underlying Fund seeks exposure or the performance of the overall markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund or Underlying Fund to sell or otherwise close a derivatives position could expose the Fund or Underlying Fund to losses and could make derivatives more difficult for the Fund or Underlying Fund to value accurately. The Fund or Underlying Fund could also suffer losses related to its derivatives positions as a result of unanticipated market movements, or movements between the time of periodic reallocations of Fund or Underlying Fund assets, which losses are potentially unlimited. Certain derivatives may give rise to a form of leverage and may expose the Fund or Underlying Fund to greater risk and increase its costs. The impact of U.S. and global

regulation of derivatives may make derivatives more costly, may limit the availability of derivatives, may delay or restrict the exercise by the Fund or Underlying Fund of termination rights or remedies upon a counterparty default under derivatives held by the Fund or Underlying Fund (which could result in losses), or may otherwise adversely affect the value or performance of derivatives.

Hedging Risk. The Fund seeks to mitigate the potential impact of interest rates on the performance of high yield bonds by entering into positions in U.S. Treasury and other futures and interest rate swaps. The Fund’s Treasury and other futures positions are not intended to mitigate credit risk or other factors influencing the price of high yield bonds, which may have a greater impact than interest rates. There is no guarantee that the Fund’s Treasury and other futures and interest rate swap positions will completely eliminate the interest rate risk of the long positions in high yield bonds. In addition, when interest rates fall, long–only high yield bond investments will perform better than the Fund’s investments. In certain falling interest rate environments, the Fund’s hedging strategy could result in disproportionately larger losses in the Treasury and other futures and interest rate swap positions as compared to gains in the long high yield bond

S-6

Table of Contents

positions attributable to interest rate changes. There is no guarantee the Fund will have positive returns, even in environments of sharply rising interest rates in which the Fund’s Treasury and other futures and interest rate swap positions might be expected to mitigate the effects of such rises. The Fund will incur expenses when entering into Treasury and other futures and interest rate swap positions.

Index-Related Risk. There is no guarantee that the Fund’s investment results will have a high degree of correlation to those of the Underlying Index or that the Fund will achieve its investment objective. Market disruptions and regulatory restrictions could have an adverse effect on the Fund’s ability to adjust its exposure to the required levels in order to track the Underlying Index. Errors in index data, index computations or the construction of the Underlying Index in accordance with its methodology may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, which may have an adverse impact on the Fund and its shareholders. Because the Index Provider is relatively new to the creation of securities indexes, there may be a greater risk that index errors will not be detected as quickly as they might be in the case of an index maintained by a long-standing index provider. Unusual market conditions may cause the Index Provider to postpone a scheduled rebalance, which could cause the Underlying Index to vary from its normal or expected composition.

S-7

Table of Contents

Interest Rate Risk. During periods of very low or negative interest rates, the Fund may be unable to maintain positive returns or pay dividends to Fund shareholders. Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, result in heightened market volatility and detract from the Fund’s performance to the extent the Fund is exposed to such interest rates. Additionally, under certain market conditions in which interest rates are low and the market prices for portfolio securities have increased, the Fund may have a very low or even negative yield. A low or negative yield would cause the Fund to lose money in certain conditions and over certain time periods. An increase in interest rates will generally cause the value of securities held by the Fund or the Underlying Fund to decline, may lead to heightened volatility in the fixed-income markets and may adversely affect the liquidity of certain fixed-income investments, including those held by the Fund or the Underlying Fund. Because rates on certain floating rate debt securities typically reset only

periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. The historically low interest rate environment heightens the risks associated with rising interest rates.

S-8

Table of Contents

the Underlying Fund and other securities and instruments in which the Fund invests based on their market valuations. An investment in the Fund will entail more costs and expenses than a direct investment in the Underlying Fund.

Through its investment in the Underlying Fund, the Fund is exposed to Management Risk, Market Risk, and Market Trading Risk, among other risks.

Market Risk. The Fund and the Underlying Fund could lose money over short periods due to short-term market movements and over longer periods

during more prolonged market downturns. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund, the Underlying Fund and their investments and could result in increased premiums or discounts to the Fund’s or Underlying Fund's NAV.

Passive Investment Risk. The Fund and the Underlying Fund are not actively managed, and BFA generally does not attempt to take defensive positions

S-9

Table of Contents

under any market conditions, including declining markets.

Privately Issued Securities Risk. The Fund or the Underlying Fund will invest in privately issued securities, including those that are normally purchased pursuant to Rule 144A or Regulation S promulgated under the Securities Act of 1933, as amended (“1933 Act”). Privately issued securities are securities that have not been registered under the 1933 Act and as a result may be subject to legal restrictions on resale. Privately issued securities are generally not traded on established markets. As a result of the absence of a public trading market, privately issued securities may be deemed to be illiquid investments, may be more difficult to value than publicly traded securities and may be subject to wide fluctuations in value. Delay or difficulty in selling such securities may result in a loss to the Fund.

Risk of Swap Agreements. A swap is a two-party contract that generally obligates each counterparty to exchange periodic payments based on a pre-determined underlying investment

or notional amount and to exchange collateral to secure the obligations of each counterparty. Swaps may be leveraged and are subject to counterparty risk, credit risk and pricing risk. Swaps may be subject to illiquidity risk, and it may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses.

S-10

Table of Contents

the Fund. Income from swaps is generally taxable. In addition, the tax treatment of certain derivatives, such as swaps, is unsettled and may be subject to future legislation, regulation or administrative pronouncements issued by the U.S. Internal Revenue Service (“IRS”). Because the Fund invests in the Underlying Fund, the Fund’s realized losses on sales of shares of the Underlying Fund may be indefinitely or permanently deferred as “wash sales.” Distributions of short-term capital gains by the Underlying Fund will be recognized as ordinary income by the Fund and would not be offset by the Fund’s capital loss carryforwards, if any. Capital loss carryforwards of the Underlying Fund, if any, would not offset net capital gains of the Fund. Each of these effects is caused by the Fund’s investment in the Underlying Fund and may result in distributions to Fund shareholders being of higher magnitude and less likely to qualify for lower capital gain tax rates than if the Fund were to invest directly in the securities and other instruments composing its portfolio.

uninvested cash, differences in timing of the accrual of or the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be heightened during times of increased market volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX EXCHANGE TRADED FUNDS (“ETFs”) THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN SWAP CONTRACTS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

S-11

Table of Contents

the Underlying Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund or the Underlying Fund not fair-valued securities or used a different valuation

methodology. The Fund’s or the Underlying Fund's ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

Performance Information

The bar chart and table that follow show how the Fund has performed on a calendar year basis and provide some indication of the risks of investing in the Fund by showing how the Fund’s average annual returns for 1 and 5 years and since inception compare with those of a broad measure of market performance. Both assume that all dividends and distributions have been reinvested in the Fund. Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. If BFA had not waived certain Fund fees during certain periods, the Fund's returns would have been lower. Effective December 1, 2021, the Fund is no longer actively managed. The performance information below prior to December 1, 2021 is based on the performance of the Fund when it was actively managed by BFA using an investment strategy substantially similar to the methodology of the Underlying Index.

Year by Year Returns (Years Ended December 31)

The best calendar quarter return during the periods shown above was 6.60% in the 2nd quarter of 2020; the worst was -14.20% in the 1st quarter of 2020.

Updated performance information, including the Fund’s current NAV, may be obtained by visiting our website at www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).

S-12

Table of Contents

Average Annual Total Returns

(for the periods ended December 31, 2021)

	One Year	Five Years	Since Fund Inception
(Inception Date: 5/27/2014)
Return Before Taxes	5.73%	4.51%	3.27%
Return After Taxes on Distributions¹	4.12%	2.48%	1.17%
Return After Taxes on Distributions and Sale of Fund Shares¹	3.37%	2.55%	1.52%
Markit iBoxx USD Liquid High Yield Interest Rate Hedged Swaps Index^2,3 (Index returns do not reflect deductions for fees, expenses, or taxes)	6.31%	4.70%	3.58%
BlackRock Interest Rate Hedged High Yield Bond Index³ (Index returns do not reflect deductions for fees, expenses, or taxes)	N/A	N/A	N/A

²	The Markit iBoxx USD Liquid High Yield Interest Rate Hedged Swaps Index is an unmanaged index that reflects the duration hedged performance of U.S. dollar-denominated high yield corporate debt.
³	Effective December 1, 2021, the fund is no longer actively managed and the Fund's new Underlying Index is the BlackRock Interest Rate Hedged High Yield Bond Index. The inception date of the BlackRock Interest Rate Hedged High Yield Bond Index is October 29, 2021.

S-13

Table of Contents

Management

Investment Adviser. BlackRock Fund Advisors.

Purchase and Sale of Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

S-14

Table of Contents

More Information About the Fund

Effective December 1, 2021, the Fund is no longer actively managed and the Fund's new Underlying Index is the BlackRock Interest Rate Hedged High Yield Bond Index.

“Tracking error” is the divergence of the Fund's performance from that of the Underlying Index. Because the Fund uses a representative sampling indexing strategy,

Table of Contents

An investment in the Fund is not a bank deposit and it is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, BFA or any of its affiliates.

The Fund's investment objective and the Underlying Index may be changed without shareholder approval.

A Further Discussion of Principal Risks

The Fund is subject to various risks, including the principal risks noted below, any of which may adversely affect the Fund’s NAV, trading price, yield, total return and ability to meet its investment objective. The Fund may be exposed to these risks directly or indirectly through the Fund's investments in the Underlying Fund. You could lose all or part of your investment in the Fund, and the Fund could underperform other investments. The order of the below risk factors does not indicate the significance of any particular risk factor.

Authorized Participant Concentration Risk. Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem Creation Units, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting. Authorized Participant concentration risk may be heightened because ETFs, such as the Fund, that invest in securities issued by non-U.S. issuers or other securities or instruments that are less widely traded often involve greater settlement and operational issues and capital costs for Authorized Participants, which may limit the availability of Authorized Participants.

Calculation Methodology Risk. The Underlying Index relies on various sources of information to assess the criteria of issuers included in the Underlying Index , including

Table of Contents

Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Underlying Fund may “call” or repay the security before its stated maturity, and the Underlying Fund may have to reinvest the proceeds in securities with lower yields, which would result in a decline in the Fund’s income, or in securities with greater risks or with other less favorable features.

Cash Management Risk. To the extent the Fund holds cash, the Fund will earn reduced income (if any) on the cash and will be subject to the credit risk of the depository institution holding the cash and any fees imposed on large cash balances. If a significant amount of the Fund’s assets are invested in cash and cash equivalents, it will be more difficult for the Fund to achieve its investment objective. The Fund may underperform other funds that do not similarly invest in cash and cash equivalents for investment purposes and/or to collateralize derivative instruments.

Commodity Regulatory Risk. The Fund is deemed a “commodity pool ” and BFA is considered a “commodity pool operator” with respect to the Fund under the CEA. BFA is therefore subject to regulation by the SEC and the CFTC. BFA is also subject to regulation by the NFA. The regulatory requirements governing the use of commodity futures, options on commodity futures, certain swaps or certain other investments could change at any time.

Table of Contents

theft of proprietary or consumer information or disruptions in service, which could have a material adverse effect on their businesses.

Table of Contents

more adversely affected by the underperformance of those securities and/or other assets, may experience increased price volatility and may be more susceptible to adverse economic, market, political or regulatory occurrences affecting those securities and/or other assets than a fund that does not concentrate its investments.

Credit Risk. Credit risk is the risk that the issuer or guarantor of a debt instrument or the counterparty to a derivatives contract, repurchase agreement or loan of portfolio securities will be unable or unwilling to make its timely interest and/or principal payments when due or otherwise honor its obligations. There are varying degrees of credit risk, depending on an issuer’s or counterparty’s financial condition and on the terms of an obligation, which may be reflected in the issuer’s or counterparty’s credit rating. There is the chance that the Fund’s or the Underlying Fund's portfolio holdings will have their credit ratings downgraded or will default (i.e., fail to make scheduled interest or principal payments), or that the market’s perception of an issuer’s creditworthiness may worsen, potentially reducing the Fund’s or the Underlying Fund's income level or share price, which may adversely affect the value of the Fund. The Fund’s hedging strategy does not seek to mitigate credit risk.

Cybersecurity Risk. With the increased use of technologies such as the internet to conduct business, the Fund, the Underlying Fund, Authorized Participants, service providers and the relevant listing exchange are susceptible to operational, information security and related “cyber” risks both directly and through their service providers. Similar types of cybersecurity risks are also present for issuers of securities in which the Fund or the Underlying Fund invest, which could result in material adverse consequences for such issuers and may cause the Fund’s or the Underlying Fund's investment in such issuers to lose value. In general, cyber incidents can result from deliberate attacks or unintentional events. Cyber incidents include, but are not limited to, gaining unauthorized access to digital systems (e.g., through “hacking” or malicious software coding) for purposes of misappropriating assets or sensitive information, corrupting data, or causing operational disruption. Cyberattacks may also be carried out in a manner that does not require gaining unauthorized access, such as causing denial-of-service attacks on websites (i.e., efforts to make network services unavailable to intended users). Recently, geopolitical tensions may have increased the scale and sophistication of deliberate attacks, particularly those from nation-states or from entities with nation-state backing.

Table of Contents

administrators), market makers, Authorized Participants or the issuers of securities in which the Fund or the Underlying Fund invest have the ability to cause disruptions and impact business operations, potentially resulting in: financial losses, interference with the Fund’s or the Underlying Fund's ability to calculate its NAV, disclosure of confidential trading information, impediments to trading, submission of erroneous trades or erroneous creation or redemption orders, the inability of the Fund, the Underlying Fund or their service providers to transact business, violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, reimbursement or other compensation costs, or additional compliance costs. In addition, cyberattacks may render records of Fund assets and transactions, shareholder ownership of Fund shares, and other data integral to the functioning of the Fund or the Underlying Fund inaccessible, inaccurate or incomplete. Substantial costs may be incurred by the Fund or the Underlying Fund in order to resolve or prevent cyber incidents in the future. While the Fund and the Underlying Fund have established business continuity plans in the event of, and risk management systems to prevent, such cyber incidents, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, that prevention and remediation efforts will not be successful or that cyberattacks will go undetected. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund or Underlying Fund, issuers in which the Fund or Underlying Fund invests, the Index Provider, hedging counterparties to the Fund or Underlying Fund, market makers or Authorized Participants. The Fund and its shareholders could be negatively impacted as a result.

Table of Contents

held by the Fund or Underlying Fund (which could result in losses), or may otherwise adversely affect the value or performance of derivatives.

The Fund seeks to mitigate the potential impact of rising interest rates on the performance of high yield bonds by entering into positions in U.S. Treasury futures and interest rate swaps. The Treasury and other futures positions are not intended to mitigate credit risk or certain other factors influencing the price of high yield bonds, which may have a greater impact than rising or falling interest rates. There is no guarantee that the futures and interest rate swap positions will achieve the targeted reduction in the interest rate risk of the long positions in high yield bonds. In addition, when interest rates fall, investors may be better off in a long–only high yield investment than with an investment in the Fund. Performance of the Fund could be particularly poor in risk-averse, flight-to-quality environments when it is common for high yield bonds to decline in value. Furthermore, the Fund may be more volatile than a long-only investment in high yield bonds. The Fund may contain a significant allocation to callable high yield bonds, which are subject to call risk and prepayment risk (see Call Risk and Prepayment Risk); callable bonds may have lower sensitivity to interest rate declines than non-callable bonds or U.S. Treasury futures. In certain falling interest rate environments, this could result in disproportionately larger losses in the futures and interest rate swap positions as compared to gains in the long high yield bond position attributable to interest rate changes. There is no guarantee the Fund will have positive returns, even in environments of sharply rising interest rates in which the Fund’s futures and interest rate swap positions might be expected to mitigate the effects of such rises. The Fund will incur expenses when entering into futures and interest rate swap positions. The use of hedging may result in certain adverse tax consequences, as noted in the Taxes section of the Prospectus.

High Yield Securities Risk. Securities that are rated below investment-grade (commonly referred to as “junk bonds,” which may include those bonds rated below “BBB-” by S&P Global Ratings and Fitch, or below “Baa3” by Moody’s), or are unrated, may be deemed speculative, may involve greater levels of risk than higher-rated securities of similar maturity and may be more likely to default.

The major risks of high yield securities investments include:

Table of Contents

■	High yield securities may be issued by less creditworthy issuers. Issuers of high yield securities may have a larger amount of outstanding debt relative to their assets than issuers of investment-grade bonds. In the event of an issuer’s bankruptcy, claims of other creditors may have priority over the claims of high yield securities holders, leaving few or no assets available to repay high yield securities holders.
■	Prices of high yield securities are subject to extreme price fluctuations. Adverse changes in an issuer’s industry and general economic conditions may have a greater impact on the prices of high yield securities than on other higher rated fixed-income securities. The credit rating of a high yield security does not necessarily address its market value risk. Ratings and market value may change from time to time, positively or negatively, to reflect new developments regarding the issuer.
■	Issuers of high yield securities may be unable to meet their interest or principal payment obligations because of an economic downturn, specific issuer developments, or the unavailability of additional financing.
■	High yield securities frequently have redemption features that permit an issuer to repurchase the security from the Underlying Fund before it matures. If the issuer redeems high yield securities held by the Underlying Fund, the Underlying Fund may have to invest the proceeds in bonds with lower yields and may lose income.
■	High yield securities may be less liquid than higher rated fixed-income securities, even under normal economic conditions. There are fewer dealers in the high yield securities market, and there may be significant differences in the prices quoted for high yield securities by the dealers. Because high yield securities may be less liquid than higher rated fixed-income securities, judgment may play a greater role in valuing certain of the Fund's or Underlying Fund's securities than is the case with securities trading in a more liquid market.
■	The Fund or the Underlying Fund may incur expenses to the extent necessary to seek recovery upon default or to negotiate new terms with a defaulting issuer.

Table of Contents

reduced prices or under unfavorable conditions to meet redemption requests or for other cash needs, the Fund may suffer a loss. This may be magnified in a rising interest rate environment or other circumstances where redemptions from the Fund may be greater than normal. Other market participants may be attempting to liquidate holdings at the same time as the Fund, causing increased supply of the Fund’s underlying investments in the market and contributing to illiquid investments risk and downward pricing pressure. During periods of market volatility, liquidity in the market for the Fund’s shares may be impacted by the liquidity in the market for the underlying securities or instruments held by the Fund, which could lead to the Fund’s shares trading at a premium or discount to the Fund's NAV.

Income Risk. The Fund’s income may decline if yields fall because the Fund or the Underlying Fund may hold a significant portion of short duration securities and/or securities that have floating or variable interest rates. The Fund’s income may decline because the Fund or the Underlying Fund invests in lower yielding bonds as bonds in its portfolio mature, are near maturity or are called, or when the Fund or the Underlying Fund needs to purchase additional bonds. Hedges entered into by the Fund may not be effective to hedge interest rate risk and, in this case, the income of the Fund may fall because both the securities of the Fund drop in value and the value of the futures and swaps held by the Fund decline.

Table of Contents

Unusual market conditions may cause the Index Provider to postpone a scheduled rebalance to the Underlying Index, which could cause the Underlying Index to vary from its normal or expected composition. The postponement of a scheduled rebalance in a time of market volatility could mean that constituents of the Underlying Index that would otherwise be removed at rebalance due to changes in market value, issuer credit ratings, or other reasons may remain, causing the performance and constituents of the Underlying Index to vary from those expected under normal conditions. Apart from scheduled rebalances, the Index Provider or its agents may carry out additional ad hoc rebalances to the Underlying Index due to reaching certain weighting constraints, unusual market conditions or corporate events or, for example, to correct an error in the selection of index constituents. When the Underlying Index is rebalanced and the Fund in turn rebalances its portfolio to attempt to increase the correlation between the Fund’s portfolio and the Underlying Index, any transaction costs and market exposure arising from such portfolio rebalancing will be borne directly by the Fund and its shareholders. Therefore, errors and additional ad hoc rebalances carried out by the Index Provider or its agents to the Underlying Index may increase the costs to and the tracking error risk of the Fund.

■	General Impact. This outbreak has resulted in travel restrictions, closed international borders, enhanced health screenings at ports of entry and elsewhere, disruption of, and delays in, healthcare service preparation and delivery, prolonged quarantines, cancellations, supply chain disruptions, lower consumer demand, temporary and permanent closures of stores, restaurants and other commercial establishments, layoffs, defaults and other significant economic impacts, as well as general concern and uncertainty.
■	Market Volatility. The outbreak has also resulted in extreme volatility, severe losses, and disruptions in markets which can adversely impact the Fund and its investments, including impairing hedging activity to the extent the Fund engages in such activity, as expected correlations between related markets or instruments may no longer apply. In addition, to the extent the Fund invests in short-term instruments that have negative yields, the Fund’s value may be impaired as a result. Certain issuers of equity securities have cancelled or announced the suspension of dividends. The outbreak has, and may continue to, negatively affect the credit ratings of some fixed-income securities and their issuers.
■	Market Closures. Certain local markets have been or may be subject to closures, and there can be no assurance that trading will continue in any local markets in which the Fund or the Underlying Fund may invest, when any resumption of trading

Table of Contents

	will occur or, once such markets resume trading, whether they will face further closures. Any suspension of trading in markets in which the Fund or the Underlying Fund invests will have an impact on the Fund or Underlying Fund and its investments and will impact the Fund’s or the Underlying Fund's ability to purchase or sell securities in such markets.
■	Operational Risk. The outbreak could also impair the information technology and other operational systems upon which the Fund’s service providers, including BFA, rely, and could otherwise disrupt the ability of employees of the Fund's service providers to perform critical tasks relating to the Fund, for example, due to the service providers’ employees performing tasks in alternate locations than under normal operating conditions or the illness of certain employees of the Fund's service providers.
■	Governmental Interventions. Governmental and quasi-governmental authorities and regulators throughout the world have responded to the outbreak and the resulting economic disruptions with a variety of fiscal and monetary policy changes, including direct capital infusions into companies and other issuers, new monetary policy tools, and lower interest rates. An unexpected or sudden reversal of these policies, or the ineffectiveness of such policies, is likely to increase market volatility, which could adversely affect the Fund’s investments.
■	Pre-Existing Conditions. Public health crises caused by the outbreak may exacerbate other pre-existing political, social and economic risks in certain countries or globally, which could adversely affect the Fund and its investments and could result in increased premiums or discounts to the Fund's NAV.

Other infectious illness outbreaks that may arise in the future could have similar or other unforeseen effects.

Interest Rate Risk. If interest rates rise, the value of fixed-income securities or other instruments held by the Fund or the Underlying Fund would likely decrease. A measure investors commonly use to determine this price sensitivity is called duration. Fixed-income securities with longer durations tend to be more sensitive to interest rate changes, usually making their prices more volatile than those of securities with shorter durations. To the extent the Fund or the Underlying Fund invests a substantial portion of its assets in fixed-income securities with longer duration, rising interest rates may cause the value of the Fund's or the Underlying Fund's investments to decline significantly, which would adversely affect the value of the Fund. An increase in interest rates may lead to heightened volatility in the fixed-income markets and adversely affect certain fixed-income investments, including those held by the Fund or the Underlying Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. In addition, decreases in fixed income dealer market-making capacity may lead to lower trading volume, heightened volatility, wider bid-ask spreads and less transparent pricing in certain fixed-income markets.

The historically low interest rate environment was created in part by the world’s major central banks keeping their overnight policy interest rates at, near or below zero

Table of Contents

percent and implementing monetary policy facilities, such as asset purchase programs, to anchor longer-term interest rates below historical levels. During periods of very low or negative interest rates, the Fund may be unable to maintain positive returns or pay dividends to Fund shareholders. Certain countries have recently experienced negative interest rates on certain fixed-income instruments. Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, result in heightened market volatility and detract from the Fund’s performance to the extent the Fund is exposed to such interest rates. Additionally, under certain market conditions in which interest rates are set at low levels and the market prices of portfolio securities have increased, the Fund or the Underlying Fund may have a very low or even negative yield. A low or negative yield would cause the Fund or the Underlying Fund to lose money in certain conditions and over certain time periods. Central banks may increase their short-term policy rates or begin phasing out, or “tapering,” accommodative monetary policy facilities in the future. The timing, coordination, magnitude and effect of such policy changes on various markets are uncertain, and such changes in monetary policy may adversely affect the value of the Fund’s investments.

Investment in the Underlying Fund Risk. The Fund expects to invest a substantial portion of its assets in the Underlying Fund, so the Fund’s investment performance is likely to be directly related to the performance of the Underlying Fund. The Fund’s NAV will change with changes in the value of the Underlying Fund and other securities in which the Fund invests based on their market valuations. An investment in the Fund will entail more direct and indirect costs and expenses than a direct investment in the Underlying Fund. For example, the Fund indirectly pays a portion of the expenses (including operating expenses and management fees) incurred by the Underlying Fund.

Table of Contents

An investor in the Fund may receive taxable gains from portfolio transactions by the Underlying Fund, as well as taxable gains from transactions in shares of the Underlying Fund by the Fund.

Market Risk. The Fund and the Underlying Fund could lose money over short periods due to short-term market movements and over longer periods during more prolonged market downturns. Market risk arises mainly from uncertainty about future values of financial instruments and may be influenced by price, currency and interest rate movements. It represents the potential loss the Fund and the Underlying Fund may suffer through holding financial instruments in the face of market movements or uncertainty. The value of a security, asset or other instrument may decline due to changes in general market conditions, economic trends or events that are not specifically related to the issuer of the security or other asset, or factors that affect a particular issuer or issuers, country, group of countries, region, market, industry, group of industries, sector or asset class. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund, the Underlying Fund and their investments and could result in increased premiums or discounts to the Fund’s or Underlying Fund's NAV. During a general market downturn, multiple asset classes may be negatively affected. Fixed-income securities with short-term maturities are generally less sensitive to such changes than are fixed-income securities with longer-term maturities. Changes in market conditions and interest rates generally do not have the same impact on all types of securities and instruments.

Table of Contents

Market Trading Risk.

Secondary Market Trading Risk. Shares of the Fund or the Underlying Fund may trade in the secondary market at times when the Fund or the Underlying Fund does not accept orders to purchase or redeem shares. At such times, shares may trade in the secondary market with more significant premiums or discounts than might be experienced at times when the Fund or the Underlying Fund accepts purchase and redemption orders. If the Fund purchases shares of the Underlying Fund at a time when the market price of Underlying Fund shares is at a premium to its NAV or sells Underlying Fund shares when their market price is at a discount to its NAV, the Fund may incur losses.

Table of Contents

these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

Privately Issued Securities Risk. The Underlying Fund will invest in privately issued securities, including those that are normally purchased pursuant to Rule 144A or Regulation S under the 1933 Act. Privately issued securities typically may be resold only to qualified institutional buyers, or in a privately negotiated transaction, or to a limited number of purchasers, or in limited quantities after they have been held for a specified period of time and other conditions are met for an exemption from registration. Because there may be relatively few potential purchasers for such securities, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer, the Underlying Fund may find it more difficult to sell such securities when it may be advisable to do so or it may be able to sell such securities only at prices lower than if such securities were more widely held and traded. At times, it also may be more difficult to determine the fair value of such securities for purposes of computing the Fund’s NAV due to the absence of an active trading market. There can be no assurance that a privately issued security that is deemed to be liquid when purchased will continue to be liquid for as long as it is held by the Fund and the Underlying Fund, and its value may decline as a result.

The U.S. has developed increasingly strained relations with a number of foreign countries. If relations with certain countries deteriorate, it could adversely affect U.S.

Table of Contents

issuers as well as non-U.S. issuers that rely on the U.S. for trade. The U.S. has also experienced increased internal unrest and discord, as well as significant challenges in managing and containing the outbreak of COVID-19. If these trends were to continue, it may have an adverse impact on the U.S. economy and the issuers in which the Fund or the Underlying Fund invests.

Tax Risk. The Fund invests in derivatives. The federal income tax treatment of a derivative may not be as favorable as a direct investment in an underlying asset. Derivatives may produce taxable income and taxable realized gain. Derivatives may adversely affect the timing, character and amount of income the Fund realizes from its investments. As a result, a larger portion of the Fund’s distributions may be treated as ordinary income rather than as capital gains. In addition, certain derivatives are subject to mark-to-market or straddle provisions of the Internal Revenue Code. If such provisions are applicable, there could be an increase (or decrease) in the amount of taxable dividends paid by the Fund. Income from swaps is generally taxable. In addition, the tax treatment of certain derivatives, such as swaps, is unsettled and may be subject to future legislation, regulation or administrative pronouncements issued by the IRS. Because the Fund invests in the Underlying Fund, the Fund’s realized losses on sales of shares of the Underlying Fund may be indefinitely or permanently deferred as “wash sales.” Distributions of short-term capital gains by the Underlying Fund will be recognized as ordinary income by the Fund and would not be offset by the Fund’s capital loss carryforwards, if any. Capital loss carryforwards of the Underlying Fund, if any, would not offset net capital gains of the Fund. Each of these effects is caused by the Fund’s investment in the Underlying Fund and may result in distributions to Fund

Table of Contents

shareholders being of higher magnitude and less likely to qualify for lower capital gain tax rates than if the Fund were to invest directly in the securities and other instruments composing its portfolio.

Tracking Error Risk. The Fund may be subject to “tracking error,” which is the divergence of the Fund’s performance from that of the Underlying Index. Tracking error may occur because of differences between the securities and other instruments held in the Fund’s portfolio and those included in the Underlying Index, pricing differences (including, as applicable, differences between a security’s price at the local market close and the Fund's or an Underlying Fund's valuation of a security at the time of calculation of the Fund's or Underlying Fund's NAV, respectively), transaction costs incurred by the Fund, the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be heightened during times of increased market volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX ETFs THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN SWAP CONTRACTS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

Valuation Risk. The price the Fund and the Underlying Fund could receive upon the sale of a security or unwind of a financial instrument or other asset may differ from the Fund's or the Underlying Fund's valuation of the security, instrument or other asset, particularly for securities or other instruments that trade in low volume or volatile markets or that are valued using a fair value methodology as a result of trade suspensions or for other reasons. Because non-U.S. exchanges may be open on days when the Underlying Fund does not price its shares, the value of the securities or other instruments in the Underlying Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund’s or the Underlying Fund's shares. In addition, for purposes of calculating the Fund's NAV, the value of assets denominated in non-U.S. currencies is translated into U.S. dollars at the prevailing market rates. This translation may result in a difference between the prices used to calculate the Fund's NAV and the prices used by the Underlying Index, which, in turn, could result in a difference between the Fund's performance and the performance of the Underlying Index. Authorized Participants who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

A Further Discussion of Other Risks

The Fund may also be subject to certain other risks associated with its investments and investment strategies either directly or indirectly through the Fund's investments

Table of Contents

in the Underlying Fund. The order of the below risk factors does not indicate the significance of any particular risk factor.

Capital Goods Industry Risk. Companies in the capital goods group of industries include aerospace & defense, building products, construction & engineering, and other manufacturers of capital intensive products. Companies in the capital goods industry may be affected by fluctuations in the business cycle and by other factors affecting manufacturing demands. The capital goods industry depends heavily on corporate spending. Companies in the capital goods industry may perform well during times of economic expansion, but as economic conditions worsen, the demand for capital goods may decrease. Many capital goods are sold internationally, and companies in this industry may be affected by market conditions in other countries and regions.

Table of Contents

also face a significant risk of liability from accidents resulting in injury or loss of life or property, pollution or other environmental problems, equipment malfunctions or mishandling of materials and a risk of loss from terrorism, cyber incident, political strife or natural disasters. Any such event could have serious consequences for the general population of the affected area and could have an adverse impact on the Fund’s or the Underlying Fund's portfolio and the performance of the Fund. Energy companies can be significantly affected by the supply of, and demand for, specific products (e.g., oil and natural gas) and services, exploration and production spending, government subsidization, world events and general economic conditions. In the context of the COVID-19 outbreak and disputes among oil-producing countries regarding potential limits on the production of crude oil, the energy sector has recently experienced increased volatility. In particular, significant market volatility in the crude oil markets as well as the oil futures markets resulted in the market price of the front month WTI crude oil futures contracts falling below zero for a period of time. Energy companies may have relatively high levels of debt and may be more likely than other companies to restructure their businesses if there are downturns in energy markets or in the global economy.

Table of Contents

Further discussions are to be held between the U.K. and the EU in relation to matters not covered by the trade agreement, such as financial services. The Fund and the Underlying Fund face risks associated with the potential uncertainty and consequences that may follow Brexit, including with respect to volatility in exchange rates and interest rates. Brexit could adversely affect European or worldwide political, regulatory, economic or market conditions and could contribute to instability in global political institutions, regulatory agencies and financial markets. Brexit has also led to legal uncertainty and could lead to politically divergent national laws and regulations as a new relationship between the U.K. and EU is defined and the U.K. determines which EU laws to replace or replicate. Any of these effects of Brexit could adversely affect any of the companies to which the Fund has exposure and any other assets in which the Fund or the Underlying Fund invests. The political, economic and legal consequences of Brexit are not yet fully known. In the short term, financial markets may experience heightened volatility, particularly those in the U.K. and Europe, but possibly worldwide. The U.K. and Europe may be less stable than they have been in recent years, and investments in the U.K. and the EU may be difficult to value or subject to greater or more frequent volatility. In the longer term, there is likely to be a period of significant political, regulatory and commercial uncertainty as the U.K. continues to negotiate the terms of its future trading relationships.

Financials Sector Risk. Companies in the financials sector of an economy are subject to extensive governmental regulation and intervention, which may adversely affect the scope of their activities, the prices they can charge, the amount of capital they must maintain and, potentially, their size. The extent to which the Fund or the Underlying Fund may invest in a company that engages in securities-related activities or banking is limited by applicable law. Governmental regulation may change frequently and may have significant adverse consequences for companies in the financials sector, including effects not intended by such regulation. Recently enacted legislation in the U.S. has relaxed capital requirements and other regulatory burdens on certain U.S. banks. While the effect of the legislation may benefit certain companies in the financials sector, increased risk taking by affected banks may also result in greater overall risk in the U.S. and global financials sector. The impact of changes in capital requirements, or recent or future regulation in various countries, on any individual financial company or on the financials sector as a whole cannot be predicted.

Certain risks may impact the value of investments in the financials sector more severely than those of investments outside this sector, including the risks associated

Table of Contents

with companies that operate with substantial financial leverage. Companies in the financials sector are exposed directly to the credit risk of their borrowers and counterparties, who may be leveraged to an unknown degree, including through swaps and other derivatives products. Financial services companies may have significant exposure to the same borrowers and counterparties, with the result that a borrower’s or counterparty’s inability to meet its obligations to one company may affect other companies with exposure to the same borrower or counterparty. This interconnectedness of risk may result in significant negative impacts to companies with direct exposure to the defaulting counterparty as well as adverse cascading effects in the markets and the financials sector generally. Companies in the financials sector may also be adversely affected by increases in interest rates and loan losses, decreases in the availability of money or asset valuations, credit rating downgrades and adverse conditions in other related markets. Insurance companies, in particular, may be subject to severe price competition and/or rate regulation, which may have an adverse impact on their profitability. The financials sector is particularly sensitive to fluctuations in interest rates. The financials sector is also a target for cyberattacks, and may experience technology malfunctions and disruptions. In recent years, cyberattacks and technology malfunctions and failures have become increasingly frequent in this sector and have reportedly caused losses to companies in this sector, which may negatively impact the Fund.

Table of Contents

Money Market Instruments Risk. The value of money market instruments may be affected by changing interest rates and by changes in the credit ratings of the investments. If a significant amount of the Fund's assets are invested in money market instruments, it will be more difficult for the Fund to achieve its investment objective. An investment in a money market fund is not insured or guaranteed by the FDIC or any other government agency. It is possible to lose money by investing in a money market fund. Money market funds other than government money market funds or retail money market funds “float” their NAV instead of using a stable $1.00 per share price.

Non-U.S. Issuers Risk. Securities issued by non-U.S. issuers have different risks from securities issued by U.S. issuers. These risks include differences in accounting, auditing and financial reporting standards, the possibility of expropriation or confiscatory taxation, adverse changes in investment or exchange control regulations, political instability which could affect U.S. investments in non-U.S. countries, uncertainties of transnational litigation, and potential restrictions on the flow of international capital, including the possible seizure or nationalization of the securities issued by non-U.S. issuers held by the Underlying Fund. Non-U.S. issuers may be subject to less governmental regulation than U.S. issuers. Moreover, individual non-U.S. economies may differ favorably or unfavorably from the U.S. economy in such respects as growth of gross domestic product, rate of inflation, capital reinvestment, resource self-sufficiency and balance of payment positions. Unfavorable political, economic or governmental developments in non-U.S. countries could affect the payment of a security’s principal and interest. Securities issued by non-U.S. issuers may also be less liquid than, and more difficult to value than, securities of U.S. issuers. In addition, the value of these securities may fluctuate due to changes in the exchange rate of the issuer’s local currency against the U.S. dollar.

Table of Contents

generally tend to rely on services sectors (e.g., the financial services sector) as the primary means of economic growth. A prolonged slowdown in one or more services sectors is likely to have a negative impact on economies of certain developed countries, although economies of individual developed countries can be impacted by slowdowns in other sectors. In the past, certain developed countries have been targets of terrorism, and some geographic areas in which the Fund or the Underlying Fund invests have experienced strained international relations due to territorial disputes, historical animosities, defense concerns and other security concerns. These situations may cause uncertainty in the financial markets in these countries or geographic areas and may adversely affect the performance of the issuers to which the Fund or the Underlying Fund has exposure. Heavy regulation of certain markets, including labor and product markets, may have an adverse effect on certain issuers. Such regulations may negatively affect economic growth or cause prolonged periods of recession. Many developed countries are heavily indebted and face rising healthcare and retirement expenses. In addition, price fluctuations of certain commodities and regulations impacting the import of commodities may negatively affect developed country economies.

Threshold/Underinvestment Risk. If certain aggregate and/or fund-level ownership thresholds are reached through transactions undertaken by BFA, its affiliates or the Fund, or as a result of third-party transactions or actions by an issuer or regulator, the ability of BFA and its affiliates on behalf of clients (including the Fund) to purchase or dispose of investments, or exercise rights or undertake business transactions, may be restricted by regulation or otherwise impaired. The capacity of the Fund to make investments in certain securities may be affected by the relevant threshold limits, and such limitations may have adverse effects on the liquidity and performance of the Fund’s portfolio holdings.

Table of Contents

Portfolio Holdings Information

A Further Discussion of Principal Investment Strategies

Overview

The Fund allocates and reallocates its assets among direct investments in securities and other instruments, and in investments in the Underlying Fund consistent with the allocation and reallocation of securities in the Underlying Index as determined by the Index Provider. The Fund intends to invest a substantial portion of its assets in one underlying fund, the Underlying Fund. The Fund seeks to track the interest rate hedging component of the Underlying Index primarily through the use of positions in interest rate swaps (i.e., contracts in which the Fund makes fixed-rate payments while receiving floating-rate payments based on a reference rate).

The Fund invests, through the Underlying Fund, in U.S. dollar-denominated, high yield corporate securities and debt instruments, which are subject to additional risks, as described in this Prospectus and in the Fund’s SAI.

The Underlying Fund

The Underlying Fund seeks to track the performance of the Markit iBoxx^® USD Liquid High Yield Index. The Markit iBoxx^® USD Liquid High Yield Index includes liquid, U.S. dollar-denominated, high yield corporate bonds for sale in the U.S., as determined by the index provider. The Markit iBoxx^® USD Liquid High Yield Index is a trademark of and is maintained by Markit Indices Limited (“Markit”) and has been licensed for use for certain purposes by BFA or its affiliates. Markit makes no representation or warranty, expressed or implied, regarding the advisability of investing in the Underlying Fund.

Table of Contents

Management

Investment Adviser. As investment adviser, BFA has overall responsibility for the general management and administration of the Fund. BFA provides an investment program for the Fund and manages the investment of the Fund’s assets. In managing the Fund, BFA may draw upon the trading, research and expertise of its asset management affiliates for portfolio decisions and management with respect to portfolio securities. In seeking to achieve the Fund's investment objective, BFA uses teams of portfolio managers, investment strategists and other investment specialists. This team approach brings together many disciplines and leverages BFA’s extensive resources.

For its investment advisory services to the Fund, BFA is paid a management fee from the Fund based on a percentage of the Fund's average daily net assets, at the annual rate of 0.65%. BFA has contractually agreed to waive a portion of its management fees so that the Fund’s total annual fund operating expenses after fee waiver are equal to the Acquired Fund Fees and Expenses attributable to the Fund’s investment in HYG, after taking into account any fee waivers by HYG, plus 0.05% through February 28, 2027. The contractual waiver may be terminated prior to February 28, 2027 only upon written agreement of the Trust and BFA. In addition, BFA may from time to time voluntarily waive and/or reimburse fees or expenses in order to limit total annual fund operating expenses (excluding Acquired Fund Fees and Expenses, if any). Any such voluntary waiver or reimbursement may be eliminated by BFA at any time.

Table of Contents

respect to the Fund under the CEA and is therefore subject to regulation by the SEC and the CFTC with respect to the Fund.

Table of Contents

one or more Affiliates act, or may act, as an investor, research provider, investment manager, commodity pool operator, commodity trading advisor, financier, underwriter, adviser, trader, lender, index provider, agent and/or principal, and have other direct and indirect interests in securities, currencies, commodities, derivatives and other instruments in which the Fund may directly or indirectly invest. The Fund may invest in securities of, or engage in other transactions with, companies with which an Affiliate has significant debt or equity investments or other interests. The Fund may also invest in issuances (such as structured notes) by entities for which an Affiliate provides and is compensated for cash management services relating to the proceeds from the sale of such issuances. The Fund also may invest in securities of, or engage in other transactions with, companies for which an Affiliate provides or may in the future provide research coverage. An Affiliate may have business relationships with, and purchase or distribute or sell services or products from or to, distributors, consultants or others who recommend the Fund or who engage in transactions with or for the Fund, and may receive compensation for such services. BFA or one or more Affiliates may engage in proprietary trading and advise accounts and funds that have investment objectives similar to those of the Fund and/or that engage in and compete for transactions in the same types of securities, currencies and other instruments as the Fund. This may include transactions in securities issued by other open-end and closed-end investment companies (which may include investment companies that are affiliated with the Fund and BFA, to the extent permitted under the Investment Company Act of 1940, as amended (the “1940 Act”)). The trading activities of BFA and these Affiliates are carried out without reference to positions held directly or indirectly by the Fund and may result in BFA or an Affiliate having positions in certain securities that are senior or junior to, or have interests different from or adverse to, the securities that are owned by the Fund.

The Fund's activities may be limited because of regulatory restrictions applicable to BFA or one or more Affiliates and/or their internal policies designed to comply with such restrictions.

Table of Contents

Shareholder Information

Table of Contents

of the underlying securities held by the Fund, particularly for newly launched or smaller funds or in instances of significant volatility of the underlying securities.

The Board has adopted a policy of not monitoring for frequent purchases and redemptions of Fund shares (“frequent trading”) that appear to attempt to take advantage of a potential arbitrage opportunity presented by a lag between a change in the value of the Fund’s portfolio securities after the close of the primary markets for the Fund’s portfolio securities and the reflection of that change in the Fund’s NAV (“market timing”), because the Fund sells and redeems its shares directly through transactions that are in-kind and/or for cash, subject to the conditions described below under Creations and Redemptions. The Board has not adopted a policy of monitoring for other frequent trading activity because shares of the Fund are listed for trading on a national securities exchange.

Section 12(d)(1) of the 1940 Act generally restricts investments by investment companies, including foreign and unregistered investment companies, in the securities of other investment companies. For example, a registered investment company (the “Acquired Fund”), such as the Fund, may not knowingly sell or otherwise dispose of any security issued by the Acquired Fund to any investment company (the “Acquiring Fund”) or any company or companies controlled by the Acquiring Fund if, immediately after such sale or disposition: (i) more than 3% of the total outstanding voting stock of the Acquired Fund is owned by the Acquiring Fund and any company or companies controlled by the Acquiring Fund or (ii) more than 10% of the total outstanding voting stock of the Acquired Fund is owned by the Acquiring Fund and other investment companies and companies controlled by them. Although SEC rules may permit registered investment companies and unit investment trusts (“Investing Funds”) that enter into an investment agreement with the Trust to invest in iShares funds beyond the limits set forth in Section 12(d)(1) of the 1940 Act subject to certain terms and conditions, the Fund does not permit such investments. Accordingly, Investing Funds must adhere to the limits set forth in Section 12(d)(1) of the 1940 Act when investing in the Fund. In addition, foreign investment companies are permitted to invest in the Fund only up to the limits set forth in Section 12(d)(1), subject to any applicable SEC no-action relief.

Table of Contents

receive physical delivery of stock certificates or to have shares registered in your name, and you are not considered a registered owner of shares. Therefore, to exercise any right as an owner of shares, you must rely upon the procedures of DTC and its participants. These procedures are the same as those that apply to any other securities that you hold in book-entry or “street name” form.

Share Prices. The trading prices of the Fund’s shares in the secondary market generally differ from the Fund’s daily NAV and are affected by market forces such as the supply of and demand for ETF shares and underlying securities held by the Fund, economic conditions and other factors.

Determination of Net Asset Value. The NAV of the Fund normally is determined once daily Monday through Friday, generally as of the close of regular trading hours of the New York Stock Exchange (“NYSE”) (normally 4:00 p.m., Eastern time) on each day that the NYSE is open for trading, based on prices at the time of closing, provided that any Fund assets or liabilities denominated in currencies other than the U.S. dollar are translated into U.S. dollars at the prevailing market rates on the date of valuation as quoted by one or more data service providers. The NAV of the Fund is calculated by dividing the value of the net assets of the Fund (i.e., the value of its total assets, which includes the value of the Underlying Fund shares in which the Fund invests, less total liabilities) by the total number of outstanding shares of the Fund, generally rounded to the nearest cent.

The value of the securities and other assets and liabilities held by the Fund is determined pursuant to valuation policies and procedures approved by the Board.

Generally, trading in non-U.S. securities and money market instruments is substantially completed each day at various times prior to the close of regular trading hours of the NYSE. The values of such securities used in computing the NAV of the Fund are determined as of such times.

Table of Contents

other asset or liability is thinly traded, when there is a significant event subsequent to the most recent market quotation, or if the trading market on which a security is listed is suspended or closed and no appropriate alternative trading market is available. A “significant event” is deemed to occur if BFA determines, in its reasonable business judgment prior to or at the time of pricing the Fund’s assets or liabilities, that the event is likely to cause a material change to the last exchange closing price or closing market price of one or more assets held by, or liabilities of, the Fund.

Dividends and Distributions

General Policies. Dividends from net investment income, if any, generally are declared and paid at least once a year by the Fund. Distributions of net realized securities gains, if any, generally are declared and paid once a year, but the Trust may make distributions on a more frequent basis for the Fund. The Trust reserves the right to declare special distributions if, in its reasonable discretion, such action is necessary or advisable to preserve its status as a regulated investment company or to avoid imposition of income or excise taxes on undistributed income or realized gains.

Taxes. As with any investment, you should consider how your investment in shares of the Fund will be taxed. The tax information in this Prospectus is provided as general information, based on current law. There is no guarantee that shares of the Fund will receive certain regulatory or accounting treatment. You should consult your own tax professional about the tax consequences of an investment in shares of the Fund.

Table of Contents

You may lose the ability to use foreign tax credits passed through by the Fund if your Fund shares are loaned out pursuant to a securities lending agreement.

For purposes of foreign tax credits for U.S. shareholders of the Fund, foreign capital

Table of Contents

gains taxes may not produce associated foreign source income, limiting the availability of such credits for U.S. persons.

If you are neither a resident nor a citizen of the U.S. or if you are a non-U.S. entity (other than a pass-through entity to the extent owned by U.S. persons), the Fund’s ordinary income dividends (which include distributions of net short-term capital gains) will generally be subject to a 30% U.S. federal withholding tax, unless a lower treaty rate applies provided that withholding tax will generally not apply to any gain or income realized by a non-U.S. shareholder in respect of any distributions of long-term capital gains or upon the sale or other disposition of shares of the Fund.

Separately, a 30% withholding tax is currently imposed on U.S.-source dividends, interest and other income items paid to (i) foreign financial institutions, including non-U.S. investment funds, unless they agree to collect and disclose to the IRS information regarding their direct and indirect U.S. account holders and (ii) certain other foreign entities, unless they certify certain information regarding their direct and indirect U.S. owners. To avoid withholding, foreign financial institutions will need to (i) enter into agreements with the IRS that state that they will provide the IRS information, including the names, addresses and taxpayer identification numbers of direct and indirect U.S. account holders; comply with due diligence procedures with respect to the identification of U.S. accounts; report to the IRS certain information with respect to U.S. accounts maintained, agree to withhold tax on certain payments made to non-compliant foreign financial institutions or to account holders who fail to provide the required information; and determine certain other information concerning their account holders, or (ii) in the event that an applicable intergovernmental agreement and implementing legislation are adopted, provide local revenue authorities with similar account holder information. Other foreign entities may need to report the name, address, and taxpayer identification number of each substantial U.S. owner or provide certifications of no substantial U.S. ownership, unless certain exceptions apply.

Table of Contents

capital gain dividends, are included in “net investment income” for purposes of the 3.8% U.S. federal Medicare contribution tax mentioned above.

Table of Contents

will be sold in transactions that would be exempt from registration under the 1933 Act. Further, an Authorized Participant that is not a “qualified institutional buyer,” as such term is defined in Rule 144A under the 1933 Act, will not be able to receive restricted securities eligible for resale under Rule 144A.

Table of Contents

Distribution

Table of Contents

Financial Highlights

Financial Highlights
(For a share outstanding throughout each period)

	iShares Interest Rate Hedged High Yield Bond ETF
	Year Ended 10/31/21	Year Ended 10/31/20	Year Ended 10/31/19	Year Ended 10/31/18	Year Ended 10/31/17
Net asset value, beginning of year	$83.10	$87.86	$90.47	$91.78	$87.42
Net investment income^(a)	3.81	4.31	5.51	4.98	4.57
Net realized and unrealized gain (loss)^(b)	4.15	(5.53)	(2.92)	(1.46)	4.21
Net increase (decrease) from investment operations	7.96	(1.22)	2.59	3.52	8.78
Distributions^(c)
From net investment income	(3.37)	(3.51)	(5.18)	(4.83)	(4.42)
Return of capital	—	(0.03)	(0.02)	—	—
Total distributions	(3.37)	(3.54)	(5.20)	(4.83)	(4.42)
Net asset value, end of year	$87.69	$83.10	$87.86	$90.47	$91.78
Total Return^(d)
Based on net asset value	9.70%	(1.32)%	3.00%	3.93%	10.26%
Ratios to Average Net Assets
Total expenses^(e)	0.65%	0.65%	0.65%	0.65%	0.65%
Total expenses after fees waived^(e)	0.05%	0.05%	0.05%	0.05%	0.05%
Net investment income	4.37%	5.12%	6.22%	5.46%	5.04%
Supplemental Data
Net assets, end of year (000)	$135,920	$62,325	$114,212	$416,178	$137,670
Portfolio turnover rate^(f)(g)	1%	1%	1%	0%^(h)	0%
^(a) Based on average shares outstanding.
^(b) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.
^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.
^(d) Where applicable, assumes the reinvestment of distributions.
^(e) The Fund indirectly bears its proportionate share of fees and expenses incurred by the underlying fund in which the Fund is invested (“acquired fund fees and expenses”). This ratio does not include these acquired fund fees and expenses.
^(f) Portfolio turnover rate excludes in-kind transactions.
^(g) Portfolio turnover rate excludes the portfolio activity of the underlying fund in which the Fund is invested. See the underlying fund's financial highlights for its respective portfolio turnover rates.
^(h) Rounds to less than 1%.

Table of Contents

Index Provider

Table of Contents

Disclaimers

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

Want to know more?

iShares.com | 1-800-474-2737

If you have any questions about the Trust or shares of the Fund or you wish to obtain the SAI, Semi-Annual or Annual Report free of charge, please:

Call:	1-800-iShares or 1-800-474-2737 (toll free) Monday through Friday, 8:30 a.m. to 6:30 p.m. (Eastern time)
Email:	iSharesETFs@blackrock.com
Write:	c/o BlackRock Investments, LLC 1 University Square Drive, Princeton, NJ 08540

Investment Company Act File No.: 811-22649

IS-P-HYGH-0322

	March 1, 2022

2022 Prospectus

iShares U.S. ETF Trust

•	iShares Interest Rate Hedged Long-Term Corporate Bond ETF \| IGBH \| NYSE ARCA

Table of Contents

Fund Overview	S-1
More Information About the Fund	1
A Further Discussion of Principal Risks	2
A Further Discussion of Other Risks	20
Portfolio Holdings Information	27
A Further Discussion of Principal Investment Strategies	27
Management	28
Shareholder Information	31
Distribution	39
Financial Highlights	40
Index Provider	41
Disclaimers	42

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

iSHARES^® INTEREST RATE HEDGED LONG-TERM CORPORATE BOND ETF

Ticker: IGBH

Stock Exchange: NYSE Arca

Investment Objective

The iShares Interest Rate Hedged Long-Term Corporate Bond ETF (the “Fund”) seeks to track the investment results of an index designed to mitigate the interest rate risk of a portfolio composed of U.S. dollar-denominated investment-grade corporate bonds with remaining maturities greater than ten years.

Fees and Expenses

The following table describes the fees and expenses that you will incur if you buy, hold and sell shares of the Fund. The investment advisory agreement between iShares U.S. ETF Trust (the “Trust”) and BlackRock Fund Advisors (“BFA”) (the “Investment Advisory Agreement”) provides that BFA will pay all operating expenses of the Fund, except: (i) the management fees, (ii) interest expenses, (iii) taxes, (iv) expenses incurred with respect to the acquisition and disposition of portfolio securities and the execution of portfolio transactions, including brokerage commissions, (v) distribution fees or expenses, and (vi) litigation expenses and extraordinary expenses. The Fund may incur “Acquired Fund Fees and Expenses.” Acquired Fund Fees and Expenses reflect the Fund's pro rata share of the fees and expenses incurred by investing in other investment companies. The impact of Acquired Fund Fees and Expenses is included in the total returns of the Fund. Acquired Fund Fees and Expenses are not included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Fund's prospectus (the “Prospectus”). BFA, the investment adviser to the Fund, has contractually agreed to waive a portion of its management fees so that the Fund’s total annual fund operating expenses after fee waiver are equal to the Acquired Fund Fees and Expenses attributable to the Fund’s investment in the iShares 10+ Year Investment Grade Corporate Bond ETF (“IGLB” or the “Underlying Fund”), after taking into account any fee waivers by IGLB, plus 0.10% through February 28, 2027. The contractual waiver may be terminated prior to February 28, 2027 only upon written agreement of the Trust and BFA.

You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Annual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investments)
Management Fees	Distribution and Service (12b-1) Fees	Other Expenses¹	Acquired Fund Fees and Expenses	Total Annual Fund Operating Expenses	Fee Waiver	Total Annual Fund Operating Expenses After Fee Waiver
0.35%	None	0.00%	0.05%	0.40%	(0.25)%	0.15%

¹	The amount rounded to 0.00%.

S-1

Table of Contents

1 Year		3 Years		5 Years		10 Years
$15		$48		$85		$369

Portfolio Turnover. The Fund or the Underlying Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate for the Fund or the Underlying Fund may indicate higher transaction costs and may cause the Fund or the Underlying Fund to incur increased expenses. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example (except costs to the Underlying Fund included as part of Acquired Fund Fees and Expenses), affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 14% of the average value of its portfolio. To the extent the Underlying Fund incurs costs from high portfolio turnover, such costs may have a negative effect on the performance of the Fund.

Principal Investment Strategies

The Fund seeks to track the investment results of the BlackRock Interest Rate Hedged Long-Term Corporate Bond Index (the “Underlying Index”), which is designed to minimize the interest rate exposure of a portfolio composed of U.S. dollar-denominated, investment-grade corporate bonds with remaining

maturities greater than ten years, represented in the Underlying Index by the Underlying Fund, by including a series of up to 10 interest rate swap contracts with different maturities (as determined by BlackRock Index Services, LLC (the “Index Provider”)). As of October 31, 2021, the Underlying Index includes approximately 11 components, and the Underlying Fund includes approximately 3,126 components. The Fund invests in U.S. dollar-denominated, investment-grade corporate bonds primarily through its investment in the Underlying Fund. The bonds in which the Underlying Fund invests generally have at least ten years until maturity at the time of investment. Under normal circumstances, the Fund and the Underlying Fund seek to maintain a weighted average maturity that is greater than ten years. Weighted average maturity is a U.S. dollar-weighted average of the remaining term to maturity of the securities in the Underlying Fund’s portfolio.

S-2

Table of Contents

changes in interest rates) at key points on the yield curve, as determined by the Index Provider. The Underlying Index includes a fixed number of shares (to be adjusted in the event of any stock splits) of the Underlying Fund, and the Index Provider rebalances the weights of the swap contracts included in the Underlying Index daily. On a monthly basis, the Index Provider will add new swap contracts to the Underlying Index and remove the previous month’s swap contracts. Finally, the Index Provider includes a 5% cash position in the Underlying Index in order to represent the collateral that is required to be kept available for the margin requirements for the swap contracts.

use of CFTC-regulated futures, options and swaps above the prescribed levels, it is considered a “commodity pool” and BFA is considered a “commodity pool operator” with respect to the Fund under the Commodity Exchange Act (“CEA”).

S-3

Table of Contents

Underlying Fund may or may not hold all of the securities and/or other instruments in the applicable Underlying Index.

The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of any collateral received).

Summary of Principal Risks

not indicate the significance of any particular risk factor.

S-4

Table of Contents

that do not similarly invest in cash and cash equivalents for investment purposes and/or to collateralize derivative instruments.

Underlying Fund's investment in that issuer. The degree of credit risk depends on an issuer's or counterparty's financial condition and on the terms of an obligation.

S-5

Table of Contents

through a clearing house. A risk of the Fund’s or Underlying Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the value of the underlying asset, the performance of the asset class to which the Fund or Underlying Fund seeks exposure or the performance of the overall markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund or Underlying Fund to sell or otherwise close a derivatives position could expose the Fund or Underlying Fund to losses and could make derivatives more difficult for the Fund or Underlying Fund to value accurately. The Fund or Underlying Fund could also suffer losses related to its derivatives positions as a result of unanticipated market movements, or movements between the time of periodic reallocations of Fund or Underlying Fund assets, which losses are potentially unlimited. Certain derivatives may give rise to a form of leverage and may expose the Fund or Underlying Fund to greater risk and increase its costs. The impact of U.S. and global regulation of derivatives may make derivatives more costly, may limit the availability of derivatives, may delay or restrict the exercise by the Fund or Underlying Fund of termination rights or remedies upon a counterparty default under derivatives held by the Fund or Underlying Fund (which could result in losses), or may otherwise adversely affect the value or performance of derivatives.

rating downgrades, and decreased liquidity in credit markets. The extent to which the Fund or the Underlying Fund may invest in a company that engages in securities-related activities or banking is limited by applicable law. The impact of changes in capital requirements and recent or future regulation of any individual financial company, or of the financials sector as a whole, cannot be predicted. In recent years, cyberattacks and technology malfunctions and failures have become increasingly frequent in this sector and have caused significant losses to companies in this sector, which may negatively impact the Fund.

Hedging Risk. The Fund seeks to mitigate the potential impact of interest rates on the performance of investment-grade corporate bonds by entering into positions in U.S. Treasury and other futures and interest rate swaps. The Fund’s Treasury and other futures positions and interest rate swaps are not intended to mitigate credit risk or other factors influencing the price of investment-grade corporate bonds, which may have a greater impact than interest rates. There is no guarantee that the Fund’s Treasury and other futures and interest rate swap positions will completely eliminate the interest rate risk of the long positions in investment-grade corporate bonds. In addition, when interest rates fall, long–

S-6

Table of Contents

only investment-grade bond investments will perform better than the Fund’s investments. In certain falling interest rate environments, the Fund’s hedging strategy could result in disproportionately larger losses in the Treasury and other futures and interest rate swap positions as compared to gains in the long investment-grade corporate bond positions attributable to interest rate changes. There is no guarantee the Fund will have positive returns, even in environments of sharply rising Treasury interest rates in which the Fund’s Treasury and other futures and interest rate swap positions might be expected to mitigate the effects of such rises. The Fund will incur expenses when entering into Treasury and other futures and interest rate swap positions.

Income Risk. The Fund's income may decline when yields fall. This decline can occur because the Underlying Fund may

subsequently invest in lower-yielding bonds as bonds in its portfolio mature, are near maturity or are called, bonds in the Underlying Fund's index are substituted, or the Underlying Fund otherwise needs to purchase additional bonds.

Index-Related Risk. There is no guarantee that the Fund’s investment results will have a high degree of correlation to those of the Underlying Index or that the Fund will achieve its investment objective. Market disruptions and regulatory restrictions could have an adverse effect on the Fund’s ability to adjust its exposure to the required levels in order to track the Underlying Index. Errors in index data, index computations or the construction of the Underlying Index in accordance with its methodology may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, which may have an adverse impact on the Fund and its shareholders. Because the Index Provider is relatively new to the creation of securities indexes, there may be a greater risk that index errors will not be detected as quickly as they might be in the case of an index maintained by a long-standing index provider. Unusual market conditions may cause the Index Provider to postpone a scheduled rebalance, which could cause the Underlying Index to vary from its normal or expected composition.

S-7

Table of Contents

Certain markets have experienced temporary closures, extreme volatility, severe losses, reduced liquidity and increased trading costs. These events will have an impact on the Fund and its investments and could impact the Fund’s ability to purchase or sell securities or cause elevated tracking error and increased premiums or discounts to the Fund's NAV. Other infectious illness outbreaks in the future may result in similar impacts.

Interest Rate Risk. During periods of very low or negative interest rates, the Fund may be unable to maintain positive returns or pay dividends to Fund shareholders. Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, result in heightened market volatility and detract from the Fund’s performance to the extent the Fund is exposed to such interest rates. Additionally, under certain market conditions in which interest rates are low and the market prices for portfolio securities have increased, the Fund may have a very low or even negative yield. A low or negative yield would cause the Fund to lose money in certain conditions and over certain time periods. An increase in interest rates will generally cause the value of securities held by the Fund or the Underlying Fund to decline, may lead to heightened volatility in the fixed-income markets and may adversely affect the liquidity of certain fixed-income investments, including those held by the Fund or the Underlying Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be

expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. The historically low interest rate environment heightens the risks associated with rising interest rates.

S-8

Table of Contents

valuations. An investment in the Fund will entail more costs and expenses than a direct investment in the Underlying Fund.

Through its investment in the Underlying Fund, the Fund is exposed to Management Risk, Market Risk, and Market Trading Risk, among other risks.

the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund, the Underlying Fund and their investments and could result in increased premiums or discounts to the Fund’s or Underlying Fund's NAV.

S-9

Table of Contents

through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

Risk of Investing in Russia. Investing in Russian securities involves significant risks, including legal, regulatory, currency and economic risks that are specific to Russia. In addition, investing in Russian securities involves risks associated with the settlement of portfolio transactions and loss of the Fund’s or Underlying Fund's ownership rights in its portfolio securities as a result of the system of share registration and custody in Russia. A number of jurisdictions, including the U.S., Canada and the European Union (the “EU”), have imposed economic sanctions on certain Russian individuals and Russian corporate entities. Additionally, Russia is alleged to have participated in state-sponsored cyberattacks against foreign companies and foreign governments. Actual and threatened responses to such activity, including purchasing restrictions, sanctions, tariffs or cyberattacks on the Russian government or Russian

companies, may impact Russia’s economy and Russian issuers of securities in which the Fund or Underlying Fund invests.

Risk of Investing in the U.S. Certain changes in the U.S. economy, such as when the U.S. economy weakens or when its financial markets decline, may have an adverse effect on the securities

S-10

Table of Contents

to which the Fund or the Underlying Fund has exposure.

than as capital gains. In addition, certain derivatives are subject to mark-to-market or straddle provisions of the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”). If such provisions are applicable, there could be an increase (or decrease) in the amount of taxable dividends paid by the Fund. Income from swaps is generally taxable. In addition, the tax treatment of certain derivatives, such as swaps, is unsettled and may be subject to future legislation, regulation or administrative pronouncements issued by the U.S. Internal Revenue Service (“IRS”). Because the Fund invests in the Underlying Fund, the Fund’s realized losses on sales of shares of the Underlying Fund may be indefinitely or permanently deferred as “wash sales.” Distributions of short-term capital gains by the Underlying Fund will be recognized as ordinary income by the Fund and would not be offset by the Fund’s capital loss carryforwards, if any. Capital loss carryforwards of the Underlying Fund, if any, would not offset net capital gains of the Fund. Each of these effects is caused by the Fund’s investment in the Underlying Fund and may result in distributions to Fund shareholders being of higher magnitude and less likely to qualify for lower capital gain tax rates than if the Fund were to invest directly in the securities and other instruments composing its portfolio.

S-11

Table of Contents

differences (including, as applicable, differences between a security’s price at the local market close and the Fund's or an Underlying Fund's valuation of a security at the time of calculation of the Fund's or Underlying Fund's NAV, respectively), transaction costs incurred by the Fund, the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be heightened during times of increased market volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX EXCHANGE TRADED FUNDS (“ETFs”) THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN SWAP CONTRACTS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

Valuation Risk. The price the Fund or the Underlying Fund could receive upon the sale of a security or unwind of a financial instrument or other asset may differ from the Fund's or the Underlying Fund's valuation of the security or other asset, particularly for securities or other instruments that trade in low volume or volatile markets or that are valued using a fair value methodology as a result of trade suspensions or for other reasons. In addition, the value of the securities or other instruments in the Fund's or the Underlying Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund's or the Underlying Fund's shares. Authorized Participants who purchase or redeem Fund shares on days when the Fund or the Underlying Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund or the Underlying Fund not fair-valued securities or used a different valuation methodology. The Fund’s or the Underlying Fund's ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

S-12

Table of Contents

Performance Information

The bar chart and table that follow show how the Fund has performed on a calendar year basis and provide some indication of the risks of investing in the Fund by showing how the Fund’s average annual returns for 1 and 5 years and since inception compare with those of a broad measure of market performance. Both assume that all dividends and distributions have been reinvested in the Fund. Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. If BFA had not waived certain Fund fees during certain periods, the Fund's returns would have been lower. Effective December 1, 2021, the Fund is no longer actively managed. The performance information below prior to December 1, 2021 is based on the performance of the Fund when it was actively managed by BFA using an investment strategy substantially similar to the methodology of the Underlying Index.

Year by Year Returns (Years Ended December 31)

The best calendar quarter return during the periods shown above was 9.31% in the 2nd quarter of 2020; the worst was -17.23% in the 1st quarter of 2020.

Updated performance information, including the Fund’s current NAV, may be obtained by visiting our website at www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).

S-13

Table of Contents

Average Annual Total Returns

(for the periods ended December 31, 2021)

	One Year	Five Years	Since Fund Inception
(Inception Date: 7/22/2015)
Return Before Taxes	2.71%	3.69%	3.27%
Return After Taxes on Distributions¹	1.60%	2.28%	1.90%
Return After Taxes on Distributions and Sale of Fund Shares¹	1.60%	2.25%	1.92%
ICE Q70A Custom Index^2,3,4 (Index returns do not reflect deductions for fees, expenses, or taxes)	3.15%	N/A	N/A
BlackRock Interest Rate Hedged Long-Term Corporate Bond Index⁴ (Index returns do not reflect deductions for fees, expenses, or taxes)	N/A	N/A	N/A

²	The ICE Q70A Custom Index is an unmanaged index that consists of the ICE BofA 10+ Year US Corporate Index plus interest rate swaps that intend to hedge the interest rate exposure of the ICE BofA 10+ Year US Corporate Index. The inception date of the ICE Q70A Custom Index was December 31, 2017. The annualized total return for the period from December 31, 2017 through December 31, 2021 for the ICE Q70A Custom Index is 1.70%. The ICE Q70A Custom Index reflects the performance of the Bloomberg Barclays U.S. Long Credit Interest Rate Swaps Hedged Index through July 31, 2018 and beginning August 1, 2018 reflects the performance of the ICE Q70A Custom Index.
³	Index returns through February 28, 2021 reflect the 3pm pricing variant of the ICE Q70A Custom Index. Index returns beginning on March 1, 2021 reflect the performance of the 4pm pricing variant of the ICE Q70A Custom Index.
⁴	Effective December 1, 2021, the fund is no longer actively managed and the Fund's new Underlying Index is the BlackRock Interest Rate Hedged Long-Term Corporate Bond Index. The inception date of the BlackRock Interest Rate Hedged Long-Term Corporate Bond Index is October 29, 2021.

S-14

Table of Contents

Management

Investment Adviser. BlackRock Fund Advisors.

Purchase and Sale of Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

S-15

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

More Information About the Fund

Effective December 1, 2021, the Fund is no longer actively managed and the Fund's new Underlying Index is the BlackRock Interest Rate Hedged Long-Term Corporate Bond Index.

“Tracking error” is the divergence of the Fund's performance from that of the

Table of Contents

An investment in the Fund is not a bank deposit and it is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, BFA or any of its affiliates.

The Fund's investment objective and the Underlying Index may be changed without shareholder approval.

A Further Discussion of Principal Risks

The Fund is subject to various risks, including the principal risks noted below, any of which may adversely affect the Fund’s NAV, trading price, yield, total return and ability to meet its investment objective. The Fund may be exposed to these risks directly or indirectly through the Fund's investments in the Underlying Fund. You could lose all or part of your investment in the Fund, and the Fund could underperform other investments. The order of the below risk factors does not indicate the significance of any particular risk factor.

Authorized Participant Concentration Risk. Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem Creation Units, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting. Authorized Participant concentration risk may be heightened because ETFs, such as the Fund, that invest in securities issued by non-U.S. issuers or other securities or instruments that are less widely traded often involve greater settlement and operational issues and capital costs for Authorized Participants, which may limit the availability of Authorized Participants.

Table of Contents

Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Underlying Fund may “call” or repay the security before its stated maturity, and the Underlying Fund may have to reinvest the proceeds in securities with lower yields, which would result in a decline in the Fund’s income, or in securities with greater risks or with other less favorable features.

Cash Management Risk. To the extent the Fund holds cash, the Fund will earn reduced income (if any) on the cash and will be subject to the credit risk of the depository institution holding the cash and any fees imposed on large cash balances. If a significant amount of the Fund’s assets are invested in cash and cash equivalents, it will be more difficult for the Fund to achieve its investment objective. The Fund may underperform other funds that do not similarly invest in cash and cash equivalents for investment purposes and/or to collateralize derivative instruments.

Concentration Risk. The Fund may be susceptible to an increased risk of loss, including losses due to adverse events that affect the Fund’s investments more than the market as a whole, to the extent that the Fund's or the Underlying Fund's investments are concentrated in the securities and/or other assets of a particular issuer or issuers, representing a particular country, group of countries, region, market, industry, group of industries, sector, market segment or asset class. The Fund may be more adversely affected by the underperformance of those securities and/or other assets, may experience increased price volatility and may be more susceptible to adverse economic, market, political or regulatory occurrences affecting those securities and/or other assets than a fund that does not concentrate its investments.

Table of Contents

Credit Risk. Credit risk is the risk that the issuer or guarantor of a debt instrument or the counterparty to a derivatives contract, repurchase agreement or loan of portfolio securities will be unable or unwilling to make its timely interest and/or principal payments when due or otherwise honor its obligations. There are varying degrees of credit risk, depending on an issuer’s or counterparty’s financial condition and on the terms of an obligation, which may be reflected in the issuer’s or counterparty’s credit rating. There is the chance that the Fund’s or the Underlying Fund's portfolio holdings will have their credit ratings downgraded or will default (i.e., fail to make scheduled interest or principal payments), or that the market’s perception of an issuer’s creditworthiness may worsen, potentially reducing the Fund’s or the Underlying Fund's income level or share price, which may adversely affect the value of the Fund. The Fund’s hedging strategy does not seek to mitigate credit risk.

Cybersecurity Risk. With the increased use of technologies such as the internet to conduct business, the Fund, the Underlying Fund, Authorized Participants, service providers and the relevant listing exchange are susceptible to operational, information security and related “cyber” risks both directly and through their service providers. Similar types of cybersecurity risks are also present for issuers of securities in which the Fund or the Underlying Fund invest, which could result in material adverse consequences for such issuers and may cause the Fund’s or the Underlying Fund's investment in such issuers to lose value. In general, cyber incidents can result from deliberate attacks or unintentional events. Cyber incidents include, but are not limited to, gaining unauthorized access to digital systems (e.g., through “hacking” or malicious software coding) for purposes of misappropriating assets or sensitive information, corrupting data, or causing operational disruption. Cyberattacks may also be carried out in a manner that does not require gaining unauthorized access, such as causing denial-of-service attacks on websites (i.e., efforts to make network services unavailable to intended users). Recently, geopolitical tensions may have increased the scale and sophistication of deliberate attacks, particularly those from nation-states or from entities with nation-state backing.

Table of Contents

may be incurred by the Fund or the Underlying Fund in order to resolve or prevent cyber incidents in the future. While the Fund and the Underlying Fund have established business continuity plans in the event of, and risk management systems to prevent, such cyber incidents, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, that prevention and remediation efforts will not be successful or that cyberattacks will go undetected. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund or Underlying Fund, issuers in which the Fund or Underlying Fund invests, the Index Provider, hedging counterparties to the Fund or Underlying Fund, market makers or Authorized Participants. The Fund and its shareholders could be negatively impacted as a result.

Financials Sector Risk. Companies in the financials sector of an economy are subject to extensive governmental regulation and intervention, which may adversely affect the scope of their activities, the prices they can charge, the amount of capital they must maintain and, potentially, their size. The extent to which the Fund or the Underlying Fund may invest in a company that engages in securities-related activities or banking is limited by applicable law. Governmental regulation may change frequently and may have significant adverse consequences for companies in the financials sector, including effects not intended by such regulation. Recently enacted legislation in the U.S. has relaxed capital requirements and other regulatory burdens on certain U.S. banks. While the effect of the legislation may benefit certain companies in the financials sector, increased risk taking by affected banks may also result in greater

Table of Contents

overall risk in the U.S. and global financials sector. The impact of changes in capital requirements, or recent or future regulation in various countries, on any individual financial company or on the financials sector as a whole cannot be predicted.

The Fund seeks to mitigate the potential impact of rising Treasury interest rates on the performance of investment-grade bonds and in U.S. Treasury securities by entering into positions in U.S. Treasury futures and interest rate swaps. The Treasury and other futures positions and interest rate swaps are not intended to mitigate credit risk or certain other factors influencing the price of investment-grade bonds, which may have a greater impact than rising or falling interest rates. There is no guarantee that the

Table of Contents

futures and interest rate swap positions will achieve the targeted reduction in the interest rate risk of the long positions in investment-grade corporate bonds. In addition, when interest rates fall, investors may be better off in a long–only investment-grade investment than with an investment in the Fund. Performance of the Fund could be particularly poor in risk-averse, flight-to-quality environments when it is common for investment-grade bonds to decline in value. Furthermore, the Fund may be more volatile than a long-only investment in investment-grade bonds. The Fund may contain a significant allocation to callable investment-grade bonds, which are subject to call risk and prepayment risk (see Call Risk and Prepayment Risk); callable bonds may have lower sensitivity to interest rate declines than non-callable bonds or U.S. Treasury futures. In certain falling interest rate environments, this could result in disproportionately larger losses in the futures and interest rate swap positions as compared to gains in the long investment-grade bond position attributable to interest rate changes. There is no guarantee the Fund will have positive returns, even in environments of sharply rising Treasury interest rates in which the Fund’s futures and interest rate swap positions might be expected to mitigate the effects of such rises. The Fund will incur expenses when entering into futures and interest rate swap positions. The use of hedging may result in certain adverse tax consequences, as noted in the Taxes section of the Prospectus.

Table of Contents

securities or instruments held by the Fund, which could lead to the Fund’s shares trading at a premium or discount to the Fund's NAV.

Income Risk. The Fund’s income may decline if yields fall because the Fund or the Underlying Fund may hold a significant portion of short duration securities and/or securities that have floating or variable interest rates. The Fund’s income may decline because the Fund or the Underlying Fund invests in lower yielding bonds as bonds in its portfolio mature, are near maturity or are called, or when the Fund or the Underlying Fund needs to purchase additional bonds. Hedges entered into by the Fund may not be effective to hedge interest rate risk and, in this case, the income of the Fund may fall because both the securities of the Fund drop in value and the value of the futures and swaps held by the Fund decline.

Table of Contents

ad hoc rebalances to the Underlying Index due to reaching certain weighting constraints, unusual market conditions or corporate events or, for example, to correct an error in the selection of index constituents. When the Underlying Index is rebalanced and the Fund in turn rebalances its portfolio to attempt to increase the correlation between the Fund’s portfolio and the Underlying Index, any transaction costs and market exposure arising from such portfolio rebalancing will be borne directly by the Fund and its shareholders. Therefore, errors and additional ad hoc rebalances carried out by the Index Provider or its agents to the Underlying Index may increase the costs to and the tracking error risk of the Fund.

■	General Impact. This outbreak has resulted in travel restrictions, closed international borders, enhanced health screenings at ports of entry and elsewhere, disruption of, and delays in, healthcare service preparation and delivery, prolonged quarantines, cancellations, supply chain disruptions, lower consumer demand, temporary and permanent closures of stores, restaurants and other commercial establishments, layoffs, defaults and other significant economic impacts, as well as general concern and uncertainty.
■	Market Volatility. The outbreak has also resulted in extreme volatility, severe losses, and disruptions in markets which can adversely impact the Fund and its investments, including impairing hedging activity to the extent the Fund engages in such activity, as expected correlations between related markets or instruments may no longer apply. In addition, to the extent the Fund invests in short-term instruments that have negative yields, the Fund’s value may be impaired as a result. Certain issuers of equity securities have cancelled or announced the suspension of dividends. The outbreak has, and may continue to, negatively affect the credit ratings of some fixed-income securities and their issuers.
■	Market Closures. Certain local markets have been or may be subject to closures, and there can be no assurance that trading will continue in any local markets in which the Fund or the Underlying Fund may invest, when any resumption of trading will occur or, once such markets resume trading, whether they will face further closures. Any suspension of trading in markets in which the Fund or the Underlying Fund invests will have an impact on the Fund or Underlying Fund and its investments and will impact the Fund’s or the Underlying Fund's ability to purchase or sell securities in such markets.
■	Operational Risk. The outbreak could also impair the information technology and other operational systems upon which the Fund’s service providers, including BFA, rely, and could otherwise disrupt the ability of employees of the Fund's service

Table of Contents

	providers to perform critical tasks relating to the Fund, for example, due to the service providers’ employees performing tasks in alternate locations than under normal operating conditions or the illness of certain employees of the Fund's service providers.
■	Governmental Interventions. Governmental and quasi-governmental authorities and regulators throughout the world have responded to the outbreak and the resulting economic disruptions with a variety of fiscal and monetary policy changes, including direct capital infusions into companies and other issuers, new monetary policy tools, and lower interest rates. An unexpected or sudden reversal of these policies, or the ineffectiveness of such policies, is likely to increase market volatility, which could adversely affect the Fund’s investments.
■	Pre-Existing Conditions. Public health crises caused by the outbreak may exacerbate other pre-existing political, social and economic risks in certain countries or globally, which could adversely affect the Fund and its investments and could result in increased premiums or discounts to the Fund's NAV.

Other infectious illness outbreaks that may arise in the future could have similar or other unforeseen effects.

Interest Rate Risk. If interest rates rise, the value of fixed-income securities or other instruments held by the Fund or the Underlying Fund would likely decrease. A measure investors commonly use to determine this price sensitivity is called duration. Fixed-income securities with longer durations tend to be more sensitive to interest rate changes, usually making their prices more volatile than those of securities with shorter durations. To the extent the Fund or the Underlying Fund invests a substantial portion of its assets in fixed-income securities with longer duration, rising interest rates may cause the value of the Fund's or the Underlying Fund's investments to decline significantly, which would adversely affect the value of the Fund. An increase in interest rates may lead to heightened volatility in the fixed-income markets and adversely affect certain fixed-income investments, including those held by the Fund or the Underlying Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. In addition, decreases in fixed income dealer market-making capacity may lead to lower trading volume, heightened volatility, wider bid-ask spreads and less transparent pricing in certain fixed-income markets.

Table of Contents

interest rates. Additionally, under certain market conditions in which interest rates are set at low levels and the market prices of portfolio securities have increased, the Fund or the Underlying Fund may have a very low or even negative yield. A low or negative yield would cause the Fund or the Underlying Fund to lose money in certain conditions and over certain time periods. Central banks may increase their short-term policy rates or begin phasing out, or “tapering,” accommodative monetary policy facilities in the future. The timing, coordination, magnitude and effect of such policy changes on various markets are uncertain, and such changes in monetary policy may adversely affect the value of the Fund’s investments.

Investment in the Underlying Fund Risk. The Fund expects to invest a substantial portion of its assets in the Underlying Fund, so the Fund’s investment performance is likely to be directly related to the performance of the Underlying Fund. The Fund’s NAV will change with changes in the value of the Underlying Fund and other securities in which the Fund invests based on their market valuations. An investment in the Fund will entail more direct and indirect costs and expenses than a direct investment in the Underlying Fund. For example, the Fund indirectly pays a portion of the expenses (including operating expenses and management fees) incurred by the Underlying Fund.

An investor in the Fund may receive taxable gains from portfolio transactions by the Underlying Fund, as well as taxable gains from transactions in shares of the Underlying Fund by the Fund.

Table of Contents

Underlying Fund is unable or unwilling to repay principal or interest when due. Any issuer of these securities may perform poorly, causing the value of its securities to decline. Poor performance may be caused by poor management decisions, competitive pressures, changes in technology, expiration of patent protection, disruptions in supply, labor problems or shortages, corporate restructurings, fraudulent disclosures, credit deterioration of the issuer or other factors. Changes to the financial condition or credit rating of an issuer of those securities may cause the value of the securities to decline. An issuer may also be subject to risks associated with the countries, states and regions in which the issuer resides, invests, sells products, or otherwise conducts operations.

Market Risk. The Fund and the Underlying Fund could lose money over short periods due to short-term market movements and over longer periods during more prolonged market downturns. Market risk arises mainly from uncertainty about future values of financial instruments and may be influenced by price, currency and interest rate movements. It represents the potential loss the Fund and the Underlying Fund may suffer through holding financial instruments in the face of market movements or uncertainty. The value of a security, asset or other instrument may decline due to changes in general market conditions, economic trends or events that are not specifically related to the issuer of the security or other asset, or factors that affect a particular issuer or issuers, country, group of countries, region, market, industry, group of industries, sector or asset class. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund, the Underlying Fund and their investments and could result in increased premiums or discounts to the Fund’s or Underlying Fund's NAV. During a general market downturn, multiple asset classes may be negatively affected. Fixed-income securities with short-term maturities are generally less sensitive to such changes than are fixed-income securities with longer-term maturities. Changes in market conditions and interest rates generally do not have the same impact on all types of securities and instruments.

Market Trading Risk.

Table of Contents

depositary receipts. There can be no assurance that the Fund’s or the Underlying Fund's shares will continue to trade on any such stock exchange or in any market or that the Fund’s or the Underlying Fund's shares will continue to meet the requirements for listing or trading on any exchange or in any market. The Fund's or the Underlying Fund's shares may be less actively traded in certain markets than in others, and investors are subject to the execution and settlement risks and market standards of the market where they or their broker direct their trades for execution. Certain information available to investors who trade Fund or Underlying Fund shares on a U.S. stock exchange during regular U.S. market hours may not be available to investors who trade in other markets, which may result in secondary market prices in such markets being less efficient.

Secondary Market Trading Risk. Shares of the Fund or the Underlying Fund may trade in the secondary market at times when the Fund or the Underlying Fund does not accept orders to purchase or redeem shares. At such times, shares may trade in the secondary market with more significant premiums or discounts than might be experienced at times when the Fund or the Underlying Fund accepts purchase and redemption orders. If the Fund purchases shares of the Underlying Fund at a time when the market price of Underlying Fund shares is at a premium to its NAV or sells Underlying Fund shares when their market price is at a discount to its NAV, the Fund may incur losses.

Table of Contents

that large discounts or premiums to the NAV of the Fund or the Underlying Fund, as applicable, are not likely to be sustained over the long term (unlike shares of many closed-end funds, which frequently trade at appreciable discounts from, and sometimes at premiums to, their NAVs). While the creation/redemption feature is designed to make it more likely that the Fund’s or the Underlying Fund's shares normally will trade on stock exchanges at prices close to the Fund’s or the Underlying Fund's next calculated NAV, exchange prices are not expected to correlate exactly with the NAV due to timing reasons, supply and demand imbalances and other factors. In addition, disruptions to creations and redemptions, including disruptions at market makers, Authorized Participants, or other market participants, and during periods of significant market volatility, may result in trading prices for shares of the Fund or the Underlying Fund that differ significantly from their respective NAV. Authorized Participants may be less willing to create or redeem Fund or Underlying Fund shares if there is a lack of an active market for such shares or its underlying investments, which may contribute to the Fund’s or Underlying Fund's shares trading at a premium or discount to NAV.

Non-U.S. Issuers Risk. Securities issued by non-U.S. issuers have different risks from securities issued by U.S. issuers. These risks include differences in accounting, auditing and financial reporting standards, the possibility of expropriation or confiscatory taxation, adverse changes in investment or exchange control regulations, political instability which could affect U.S. investments in non-U.S. countries, uncertainties of transnational litigation, and potential restrictions on the flow of international capital, including the possible seizure or nationalization of the securities issued by non-U.S. issuers held by the Underlying Fund. Non-U.S. issuers may be subject to less governmental regulation than U.S. issuers. Moreover, individual non-U.S. economies may differ favorably or unfavorably from the U.S. economy in such respects as growth of gross domestic product, rate of inflation, capital reinvestment, resource self-sufficiency and balance of payment positions. Unfavorable political, economic or governmental developments in non-U.S. countries could affect the payment of a security’s principal and interest. Securities issued by non-U.S. issuers may also be less liquid than, and more difficult to value than, securities of U.S. issuers.

Table of Contents

In addition, the value of these securities may fluctuate due to changes in the exchange rate of the issuer’s local currency against the U.S. dollar.

Operational Risk. The Fund and the Underlying Fund are exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund's or the Underlying Fund's service providers, counterparties or other third parties, failed or inadequate processes and technology or systems failures. The Fund, the Underlying Fund and BFA seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

Risk of Investing in Russia. Investing in Russian securities involves significant risks, in addition to those described under “Risk of Investing in Emerging Markets” and “Non-U.S. Issuers Risk,” that are not typically associated with investing in U.S. securities, including:

■	The risk of delays in settling portfolio transactions and the risk of loss arising out of the system of share registration and custody used in Russia;
■	Risks in connection with the maintenance of the Fund's or the Underlying Fund’s portfolio securities and cash with foreign sub-custodians and securities depositories, including the risk that appropriate sub-custody arrangements will not be available to the Fund or the Underlying Fund;
■	The risk that the Fund's or the Underlying Fund’s ownership rights in portfolio securities could be lost through fraud or negligence because ownership in shares of Russian companies is recorded by the companies themselves and by registrars, rather than by a central registration system;
■	The risk that the Fund or the Underlying Fund may not be able to pursue claims on behalf of its shareholders because of the system of share registration and custody, and because Russian banking institutions and registrars are not guaranteed by the Russian government; and

Table of Contents

■	The risk that various responses by other nation-states to alleged Russian cyber activity will impact Russia’s economy and Russian issuers of securities in which the Fund invests.

Russia Sanctions. The U.S. and the Economic and Monetary Union of the EU, along with the regulatory bodies of a number of countries including Japan, Australia, Norway, Switzerland and Canada (collectively, “Sanctioning Bodies”), have imposed economic sanctions, which consist of prohibiting certain securities trades, prohibiting certain private transactions in the energy sector, asset freezes and prohibition of all business, with certain Russian individuals and Russian corporate entities. The Sanctioning Bodies could also institute broader sanctions on Russia. These sanctions, or even the threat of further sanctions, may result in the decline of the value and liquidity of Russian securities, a weakening of the ruble or other adverse consequences to the Russian economy. These sanctions could also result in the immediate freeze of Russian securities and/or funds invested in prohibited assets, impairing the ability of the Fund or Underlying Fund to buy, sell, receive or deliver those securities and/or assets.

The sanctions against certain Russian issuers include prohibitions on transacting in or dealing in issuances of debt or equity of such issuers. Compliance with each of these sanctions may impair the ability of the Fund to buy, sell, hold, receive or deliver the affected securities or other securities of such issuers. If it becomes impracticable or unlawful for the Fund or Underlying Fund to hold securities subject to, or otherwise affected by, sanctions (collectively, “affected securities”), or if deemed appropriate by BFA, the Fund or Underlying Fund may prohibit in-kind deposits of the affected securities in connection with creation transactions and instead require a cash deposit, which may also increase the Fund's or Underlying Fund's transaction costs. The Fund or Underlying Fund may also be legally required to freeze assets in a blocked account.

Also, if an affected security is included in the Underlying Fund’s underlying index, the Underlying Fund may, where practicable, seek to eliminate its holdings of the affected security by employing or augmenting its representative sampling strategy to seek to track the investment results of its underlying index. The use of (or increased use of) a representative sampling strategy may increase the Underlying Fund’s tracking error risk. If the affected securities constitute a significant percentage of the underlying index, the Underlying Fund may not be able to effectively implement a representative sampling strategy, which may result in significant tracking error between the Underlying Fund’s performance and the performance of its underlying index.

Current or future sanctions may result in Russia taking counter measures or retaliatory actions, which may further impair the value and liquidity of Russian securities. These retaliatory measures may include the immediate freeze of Russian assets held by the Fund or Underlying Fund. In the event of such a freeze of any Fund or Underlying Fund assets, including depositary receipts, the Fund or Underlying Fund may need to liquidate non-restricted assets in order to satisfy any Fund or Underlying Fund redemption orders. The liquidation of Fund or Underlying Fund assets during this time may also result in the Fund or Underlying Fund receiving substantially lower prices for its securities.

These sanctions may also lead to changes in the Underlying Fund’s underlying index. The Underlying Fund’s index provider may remove securities from the underlying index

Table of Contents

or implement caps on the securities of certain issuers that have been subject to recent economic sanctions. In such an event, it is expected that the Underlying Fund will rebalance its portfolio to bring it in line with its underlying index as a result of any such changes, which may result in transaction costs and increased tracking error. These sanctions, the volatility that may result in the trading markets for Russian securities and the possibility that Russia may impose investment or currency controls on investors may cause the Underlying Fund to invest in, or increase the Underlying Fund’s investments in, depositary receipts that represent the securities of its underlying index. These investments may result in increased transaction costs and increased tracking error.

Table of Contents

governmental decision making, armed conflict, crime and instability as a result of religious, ethnic and/or socioeconomic unrest. Although the political situation in Saudi Arabia is largely stable, Saudi Arabia has historically experienced political instability, and there remains the possibility that instability in the larger Middle East region could adversely impact the economy of Saudi Arabia. Political instability in the larger Middle East region has caused significant disruptions to many industries. Continued political and social unrest in these areas may negatively affect the value of securities in the Fund’s or Underlying Fund's portfolio.

Table of Contents

into account the tax impact to shareholders of substitute payments for dividends when managing the Fund's securities lending program.

Tax Risk. The Fund invests in derivatives. The federal income tax treatment of a derivative may not be as favorable as a direct investment in an underlying asset. Derivatives may produce taxable income and taxable realized gain. Derivatives may adversely affect the timing, character and amount of income the Fund realizes from its investments. As a result, a larger portion of the Fund’s distributions may be treated as ordinary income rather than as capital gains. In addition, certain derivatives are subject to mark-to-market or straddle provisions of the Internal Revenue Code. If such provisions are applicable, there could be an increase (or decrease) in the amount of taxable dividends paid by the Fund. Income from swaps is generally taxable. In addition, the tax treatment of certain derivatives, such as swaps, is unsettled and may be subject to future legislation, regulation or administrative pronouncements issued by the IRS. Because the Fund invests in the Underlying Fund, the Fund’s realized losses on sales of shares of the Underlying Fund may be indefinitely or permanently deferred as “wash sales.” Distributions of short-term capital gains by the Underlying Fund will be recognized as ordinary income by the Fund and would not be offset by the Fund’s capital loss carryforwards, if any. Capital loss carryforwards of the Underlying Fund, if any, would not offset net capital gains of the Fund. Each of these effects is caused by the Fund’s investment in the Underlying Fund and may result in distributions to Fund shareholders being of higher magnitude and less likely to qualify for lower capital gain tax rates than if the Fund were to invest directly in the securities and other instruments composing its portfolio.

Tracking Error Risk. The Fund may be subject to “tracking error,” which is the divergence of the Fund’s performance from that of the Underlying Index. Tracking error may occur because of differences between the securities and other instruments held in the Fund’s portfolio and those included in the Underlying Index, pricing differences (including, as applicable, differences between a security’s price at the local market close and the Fund's or an Underlying Fund's valuation of a security at the time of calculation of the Fund's or Underlying Fund's NAV, respectively), transaction costs incurred by the Fund, the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of distributions, the requirements to maintain pass-through tax treatment, portfolio transactions carried out to minimize the distribution of capital gains to shareholders, acceptance of custom baskets, changes to the Underlying Index or the costs to the Fund of complying with various new or existing regulatory requirements, among other reasons. This risk may be heightened during times of increased market volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. INDEX ETFs THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN SWAP CONTRACTS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFs THAT DO NOT TRACK SUCH INDICES.

Table of Contents

markets or that are valued using a fair value methodology as a result of trade suspensions or for other reasons. Because non-U.S. exchanges may be open on days when the Underlying Fund does not price its shares, the value of the securities or other instruments in the Underlying Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund’s or the Underlying Fund's shares. In addition, for purposes of calculating the Fund's NAV, the value of assets denominated in non-U.S. currencies is translated into U.S. dollars at the prevailing market rates. This translation may result in a difference between the prices used to calculate the Fund's NAV and the prices used by the Underlying Index, which, in turn, could result in a difference between the Fund's performance and the performance of the Underlying Index. Authorized Participants who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

A Further Discussion of Other Risks

Table of Contents

drastically affect a communication services company's profitability. In addition, while all companies may be susceptible to network security breaches, certain companies in the communication services sector may be particular targets of hacking and potential theft of proprietary or consumer information or disruptions in service, which could have a material adverse effect on their businesses.

Table of Contents

changes in the levels and volatility of global energy prices, energy supply and demand, and capital expenditures on exploration and production of energy sources; exchange rates, interest rates, economic conditions, and tax treatment; and energy conservation efforts, increased competition and technological advances. Companies in this sector may be subject to substantial government regulation and contractual fixed pricing, which may increase the cost of doing business and limit the earnings of these companies. A significant portion of the revenues of these companies may depend on a relatively small number of customers, including governmental entities and utilities. As a result, governmental budget constraints may have a material adverse effect on the stock prices of companies in this sector. Energy companies may also operate in, or engage in transactions involving, countries with less developed regulatory regimes or a history of expropriation, nationalization or other adverse policies. Energy companies also face a significant risk of liability from accidents resulting in injury or loss of life or property, pollution or other environmental problems, equipment malfunctions or mishandling of materials and a risk of loss from terrorism, cyber incident, political strife or natural disasters. Any such event could have serious consequences for the general population of the affected area and could have an adverse impact on the Fund’s or the Underlying Fund's portfolio and the performance of the Fund. Energy companies can be significantly affected by the supply of, and demand for, specific products (e.g., oil and natural gas) and services, exploration and production spending, government subsidization, world events and general economic conditions. In the context of the COVID-19 outbreak and disputes among oil-producing countries regarding potential limits on the production of crude oil, the energy sector has recently experienced increased volatility. In particular, significant market volatility in the crude oil markets as well as the oil futures markets resulted in the market price of the front month WTI crude oil futures contracts falling below zero for a period of time. Energy companies may have relatively high levels of debt and may be more likely than other companies to restructure their businesses if there are downturns in energy markets or in the global economy.

Table of Contents

Ukraine. These events have adversely affected the exchange rate of the euro and may continue to significantly affect European countries.

Responses to financial problems by European governments, central banks and others, including austerity measures and reforms, may not produce the desired results, may result in social unrest, may limit future growth and economic recovery or may have other unintended consequences. Further defaults or restructurings by governments and other entities of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In addition, one or more countries may abandon the euro and/or withdraw from the EU. The U.K. left the EU (“Brexit”) on January 31, 2020. The U.K. and EU have reached an agreement on the terms of their future trading relationship effective January 1, 2021, which principally relates to the trading of goods rather than services, including financial services. Further discussions are to be held between the U.K. and the EU in relation to matters not covered by the trade agreement, such as financial services. The Fund and the Underlying Fund face risks associated with the potential uncertainty and consequences that may follow Brexit, including with respect to volatility in exchange rates and interest rates. Brexit could adversely affect European or worldwide political, regulatory, economic or market conditions and could contribute to instability in global political institutions, regulatory agencies and financial markets. Brexit has also led to legal uncertainty and could lead to politically divergent national laws and regulations as a new relationship between the U.K. and EU is defined and the U.K. determines which EU laws to replace or replicate. Any of these effects of Brexit could adversely affect any of the companies to which the Fund has exposure and any other assets in which the Fund or the Underlying Fund invests. The political, economic and legal consequences of Brexit are not yet fully known. In the short term, financial markets may experience heightened volatility, particularly those in the U.K. and Europe, but possibly worldwide. The U.K. and Europe may be less stable than they have been in recent years, and investments in the U.K. and the EU may be difficult to value or subject to greater or more frequent volatility. In the longer term, there is likely to be a period of significant political, regulatory and commercial uncertainty as the U.K. continues to negotiate the terms of its future trading relationships.

Healthcare Sector Risk. The profitability of companies in the healthcare sector may be adversely affected by the following factors, among others: extensive government regulations, restrictions on government reimbursement for medical expenses, rising

Table of Contents

costs of medical products and services, pricing pressure, an increased emphasis on outpatient services, changes in the demand for medical products and services, a limited number of products, industry innovation, changes in technologies and other market developments. A number of issuers in the healthcare sector have recently merged or otherwise experienced consolidation. The effects of this trend toward consolidation are unknown and may be far-reaching. Many healthcare companies are heavily dependent on patent protection. The expiration of a company’s patents may adversely affect that company’s profitability. Many healthcare companies are subject to extensive litigation based on product liability and similar claims. Healthcare companies are subject to competitive forces that may make it difficult to raise prices and, in fact, may result in price discounting. Many new products in the healthcare sector may be subject to regulatory approvals. The process of obtaining such approvals may be long and costly, and such efforts ultimately may be unsuccessful. Companies in the healthcare sector may be thinly capitalized and may be susceptible to product obsolescence. In addition, a number of legislative proposals concerning healthcare have been considered by the U.S. Congress in recent years. It is unclear what proposals will ultimately be enacted, if any, and what effect they may have on companies in the healthcare sector.

Table of Contents

whose terms currently include LIBOR. While some existing LIBOR-based instruments may contemplate a scenario where LIBOR is no longer available by providing for an alternative rate-setting methodology, there may be significant uncertainty regarding the effectiveness of any such alternative methodologies to replicate LIBOR. Not all existing LIBOR-based instruments may have alternative rate-setting provisions and there remains uncertainty regarding the willingness and ability of issuers to add alternative rate-setting provisions in certain existing instruments. Global regulators have advised market participants to cease entering into new contracts using LIBOR as a reference rate, and it is possible that investments in LIBOR-based instruments could invite regulatory scrutiny. In addition, a liquid market for newly issued instruments that use a reference rate other than LIBOR still may be developing. There may also be challenges for the Fund to enter into hedging transactions against such newly issued instruments until a market for such hedging transactions develops. All of the aforementioned may adversely affect the Fund’s performance or NAV.

Money Market Instruments Risk. The value of money market instruments may be affected by changing interest rates and by changes in the credit ratings of the investments. If a significant amount of the Fund's assets are invested in money market instruments, it will be more difficult for the Fund to achieve its investment objective. An investment in a money market fund is not insured or guaranteed by the FDIC or any other government agency. It is possible to lose money by investing in a money market fund. Money market funds other than government money market funds or retail money market funds “float” their NAV instead of using a stable $1.00 per share price.

Privately Issued Securities Risk. The Underlying Fund will invest in privately issued securities, including those that are normally purchased pursuant to Rule 144A or Regulation S under the Securities Act of 1933, as amended (the “1933 Act”). Privately issued securities typically may be resold only to qualified institutional buyers, or in a privately negotiated transaction, or to a limited number of purchasers, or in limited quantities after they have been held for a specified period of time and other conditions are met for an exemption from registration. Because there may be relatively few potential purchasers for such securities, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer, the Underlying Fund may find it more difficult to sell such securities when it may be advisable to do so or it may be able to sell such securities only at prices lower than if such securities were more widely held and traded. At times, it also may be more difficult to determine the fair value of such securities for purposes of computing the Fund’s NAV due to the absence of an active trading market. There can be no assurance that a privately issued security that is deemed to be liquid when purchased will continue to be liquid for as long as it is held by the Fund and the Underlying Fund, and its value may decline as a result.

Table of Contents

countries, although economies of individual developed countries can be impacted by slowdowns in other sectors. In the past, certain developed countries have been targets of terrorism, and some geographic areas in which the Fund or the Underlying Fund invests have experienced strained international relations due to territorial disputes, historical animosities, defense concerns and other security concerns. These situations may cause uncertainty in the financial markets in these countries or geographic areas and may adversely affect the performance of the issuers to which the Fund or the Underlying Fund has exposure. Heavy regulation of certain markets, including labor and product markets, may have an adverse effect on certain issuers. Such regulations may negatively affect economic growth or cause prolonged periods of recession. Many developed countries are heavily indebted and face rising healthcare and retirement expenses. In addition, price fluctuations of certain commodities and regulations impacting the import of commodities may negatively affect developed country economies.

Threshold/Underinvestment Risk. If certain aggregate and/or fund-level ownership thresholds are reached through transactions undertaken by BFA, its affiliates or the Fund, or as a result of third-party transactions or actions by an issuer or regulator, the ability of BFA and its affiliates on behalf of clients (including the Fund) to purchase or dispose of investments, or exercise rights or undertake business transactions, may be restricted by regulation or otherwise impaired. The capacity of the Fund to make investments in certain securities may be affected by the relevant threshold limits, and such limitations may have adverse effects on the liquidity and performance of the Fund’s portfolio holdings.

Utilities Sector Risk. Companies in the utilities sector may be adversely affected by changes in exchange rates, domestic and international competition, and governmental limitations on rates charged to consumers. The value of regulated utility debt securities (and, to a lesser extent, equity securities) tends to have an inverse relationship to the movement of interest rates. Deregulation may subject utility companies to greater competition and may adversely affect their profitability. As deregulation allows utility companies to diversify outside of their original geographic regions and their traditional lines of business, utility companies may engage in riskier ventures. In addition,

Table of Contents

deregulation may eliminate restrictions on the profits of certain utility companies, but may also subject these companies to greater risk of loss. Companies in the utilities industry may have difficulty obtaining an adequate return on invested capital, raising capital, or financing large construction projects during periods of inflation or unsettled capital markets; face restrictions on operations and increased cost and delays attributable to environmental considerations and regulation; find that existing plants, equipment or products have been rendered obsolete by technological innovations; or be subject to increased costs because of the scarcity of certain fuels or the effects of man-made or natural disasters. Existing and future regulations or legislation may make it difficult for utility companies to operate profitably. Government regulators monitor and control utility revenues and costs, and therefore may limit utility profits. There is no assurance that regulatory authorities will grant rate increases in the future or that such increases will be adequate to permit the payment of coupon payments on bonds issued by a utility company. Energy conservation and changes in climate policy may also have a significant adverse impact on the revenues and expenses of utility companies.

Portfolio Holdings Information

A Further Discussion of Principal Investment Strategies

Overview

The Fund allocates and reallocates its assets among direct investments in securities and other instruments, and in investments in the Underlying Fund consistent with the allocation and reallocation of securities in the Underlying Index as determined by the Index Provider. The Fund intends to invest a substantial portion of its assets in one underlying fund, the Underlying Fund. The Fund seeks to track the interest rate hedging component of the Underlying Index primarily through the use of positions in interest rate swaps (i.e., contracts in which the Fund makes fixed-rate payments while receiving floating-rate payments based on a reference rate).

The Underlying Fund

The Fund invests a substantial portion of its assets in the Underlying Fund, so the Fund’s investment performance is directly related to the performance of the

Table of Contents

Underlying Fund. The Fund’s NAV will change with changes in the value of the Underlying Fund and other securities in which the Fund invests. An investment in the Fund will entail more direct and indirect costs and expenses than a direct investment in the Underlying Fund.

The Underlying Fund seeks to track the investment results of the ICE BofA 10+ Year US Corporate Index, which measures the performance of U.S. dollar-denominated, investment-grade corporate bonds that have a remaining maturity of greater than or equal to ten years. The ICE BofA 10+ Year US Corporate Index is a trademark of and is maintained by ICE Data Indices, LLC (“ICE Data”) and has been licensed for use for certain purposes by BFA or its affiliates. ICE Data makes no representation or warranty, expressed or implied, regarding the advisability of investing in the Underlying Fund.

Management

Investment Adviser. As investment adviser, BFA has overall responsibility for the general management and administration of the Fund. BFA provides an investment program for the Fund and manages the investment of the Fund’s assets. In managing the Fund, BFA may draw upon the trading, research and expertise of its asset management affiliates for portfolio decisions and management with respect to portfolio securities. In seeking to achieve the Fund's investment objective, BFA uses teams of portfolio managers, investment strategists and other investment specialists. This team approach brings together many disciplines and leverages BFA’s extensive resources.

For its investment advisory services to the Fund, BFA is paid a management fee from the Fund based on a percentage of the Fund's average daily net assets, at the annual rate of 0.35%. BFA has contractually agreed to waive a portion of its management fees so that the Fund’s total annual fund operating expenses after fee waiver are equal to the Acquired Fund Fees and Expenses attributable to the Fund’s investment in IGLB, after taking into account any fee waivers by IGLB, plus 0.10% through February 28,

Table of Contents

2027. The contractual waiver may be terminated prior to February 28, 2027 only upon written agreement of the Trust and BFA. In addition, BFA may from time to time voluntarily waive and/or reimburse fees or expenses in order to limit total annual fund operating expenses (excluding Acquired Fund Fees and Expenses, if any). Any such voluntary waiver or reimbursement may be eliminated by BFA at any time.

Administrator, Custodian and Transfer Agent. State Street Bank and Trust Company (“State Street”) is the administrator, custodian and transfer agent for the

Table of Contents

Fund. JPMorgan Chase Bank, N.A. serves as custodian for the Fund in connection with certain securities lending activities.

Table of Contents

The Fund's activities may be limited because of regulatory restrictions applicable to BFA or one or more Affiliates and/or their internal policies designed to comply with such restrictions.

Shareholder Information

Buying or selling Fund shares on an exchange or other secondary market involves two types of costs that may apply to all securities transactions. When buying or selling

Table of Contents

shares of the Fund through a broker, you may incur a brokerage commission and other charges. The commission is frequently a fixed amount and may be a significant proportional cost for investors seeking to buy or sell small amounts of shares. In addition, you may incur the cost of the “spread,” that is, any difference between the bid price and the ask price. The spread varies over time for shares of the Fund based on the Fund’s trading volume and market liquidity, and is generally lower if the Fund has high trading volume and market liquidity, and higher if the Fund has little trading volume and market liquidity (which is often the case for funds that are newly launched or small in size). The Fund's spread may also be impacted by the liquidity or illiquidity of the underlying securities held by the Fund, particularly for newly launched or smaller funds or in instances of significant volatility of the underlying securities.

The Board has adopted a policy of not monitoring for frequent purchases and redemptions of Fund shares (“frequent trading”) that appear to attempt to take advantage of a potential arbitrage opportunity presented by a lag between a change in the value of the Fund’s portfolio securities after the close of the primary markets for the Fund’s portfolio securities and the reflection of that change in the Fund’s NAV (“market timing”), because the Fund sells and redeems its shares directly through transactions that are in-kind and/or for cash, subject to the conditions described below under Creations and Redemptions. The Board has not adopted a policy of monitoring for other frequent trading activity because shares of the Fund are listed for trading on a national securities exchange.

Section 12(d)(1) of the 1940 Act generally restricts investments by investment companies, including foreign and unregistered investment companies, in the securities of other investment companies. For example, a registered investment company (the “Acquired Fund”), such as the Fund, may not knowingly sell or otherwise dispose of any security issued by the Acquired Fund to any investment company (the “Acquiring Fund”) or any company or companies controlled by the Acquiring Fund if, immediately after such sale or disposition: (i) more than 3% of the total outstanding voting stock of the Acquired Fund is owned by the Acquiring Fund and any company or companies controlled by the Acquiring Fund or (ii) more than 10% of the total outstanding voting stock of the Acquired Fund is owned by the Acquiring Fund and other investment companies and companies controlled by them. Although SEC rules may permit registered investment companies and unit investment trusts (“Investing Funds”) that enter into an investment agreement with the Trust to invest in iShares funds beyond the limits set forth in Section 12(d)(1) of the 1940 Act subject to certain terms and conditions, the Fund does not permit such investments. Accordingly, Investing Funds must adhere to the limits set forth in Section 12(d)(1) of the 1940 Act when investing in the Fund. In addition, foreign investment companies are permitted to invest in the

Table of Contents

Fund only up to the limits set forth in Section 12(d)(1), subject to any applicable SEC no-action relief.

Share Prices. The trading prices of the Fund’s shares in the secondary market generally differ from the Fund’s daily NAV and are affected by market forces such as the supply of and demand for ETF shares and underlying securities held by the Fund, economic conditions and other factors.

Determination of Net Asset Value. The NAV of the Fund normally is determined once daily Monday through Friday, generally as of the close of regular trading hours of the New York Stock Exchange (“NYSE”) (normally 4:00 p.m., Eastern time) on each day that the NYSE is open for trading, based on prices at the time of closing, provided that any Fund assets or liabilities denominated in currencies other than the U.S. dollar are translated into U.S. dollars at the prevailing market rates on the date of valuation as quoted by one or more data service providers. The NAV of the Fund is calculated by dividing the value of the net assets of the Fund (i.e., the value of its total assets, which includes the value of the Underlying Fund shares in which the Fund invests, less total liabilities) by the total number of outstanding shares of the Fund, generally rounded to the nearest cent.

The value of the securities and other assets and liabilities held by the Fund is determined pursuant to valuation policies and procedures approved by the Board.

Table of Contents

Generally, trading in non-U.S. securities and money market instruments is substantially completed each day at various times prior to the close of regular trading hours of the NYSE. The values of such securities used in computing the NAV of the Fund are determined as of such times.

Dividends and Distributions

General Policies. Dividends from net investment income, if any, generally are declared and paid at least once a year by the Fund. Distributions of net realized securities gains, if any, generally are declared and paid once a year, but the Trust may make distributions on a more frequent basis for the Fund. The Trust reserves the right to declare special distributions if, in its reasonable discretion, such action is necessary or advisable to preserve its status as a regulated investment company or to avoid imposition of income or excise taxes on undistributed income or realized gains.

Table of Contents

distributions. Beneficial owners should contact their broker to determine the availability and costs of the service and the details of participation therein. Brokers may require beneficial owners to adhere to specific procedures and timetables. If this service is available and used, dividend distributions of both income and realized gains will be automatically reinvested in additional whole shares of the Fund purchased in the secondary market.

Taxes. As with any investment, you should consider how your investment in shares of the Fund will be taxed. The tax information in this Prospectus is provided as general information, based on current law. There is no guarantee that shares of the Fund will receive certain regulatory or accounting treatment. You should consult your own tax professional about the tax consequences of an investment in shares of the Fund.

You may lose the ability to use foreign tax credits passed through by the Fund if your Fund shares are loaned out pursuant to a securities lending agreement.

Table of Contents

Underlying Fund at the close of a year consists of non-U.S. stocks or securities (generally, for this purpose, depositary receipts, no matter where traded, of non-U.S. companies are treated as “non-U.S.”) (and 50% of the total assets of the Fund at the close of the year consists of securities issued by non-U.S. issuers, or, at the close of each quarter, shares of the Underlying Fund), the Fund may “pass through” to you certain non-U.S. income taxes (including withholding taxes) paid by the Fund or the Underlying Fund. This means that you would be considered to have received as an additional dividend your share of such non-U.S. taxes, but you may be entitled to either a corresponding tax deduction in calculating your taxable income, or, subject to certain limitations, a credit in calculating your U.S. federal income tax.

If you are neither a resident nor a citizen of the U.S. or if you are a non-U.S. entity (other than a pass-through entity to the extent owned by U.S. persons), the Fund’s ordinary income dividends (which include distributions of net short-term capital gains) will generally be subject to a 30% U.S. federal withholding tax, unless a lower treaty rate applies provided that withholding tax will generally not apply to any gain or income realized by a non-U.S. shareholder in respect of any distributions of long-term capital gains or upon the sale or other disposition of shares of the Fund.

Separately, a 30% withholding tax is currently imposed on U.S.-source dividends, interest and other income items paid to (i) foreign financial institutions, including non-U.S. investment funds, unless they agree to collect and disclose to the IRS information regarding their direct and indirect U.S. account holders and (ii) certain other foreign entities, unless they certify certain information regarding their direct and indirect U.S. owners. To avoid withholding, foreign financial institutions will need to (i) enter into agreements with the IRS that state that they will provide the IRS information, including the names, addresses and taxpayer identification numbers of direct and indirect U.S. account holders; comply with due diligence procedures with respect to the identification of U.S. accounts; report to the IRS certain information with respect to U.S. accounts maintained, agree to withhold tax on certain payments made to non-compliant foreign financial institutions or to account holders who fail to provide the required information; and determine certain other information concerning their account holders, or (ii) in the event that an applicable intergovernmental agreement and implementing legislation are adopted, provide local revenue authorities with similar account holder information. Other foreign entities may need to report the name, address, and taxpayer identification number of each substantial U.S. owner or provide certifications of no substantial U.S. ownership, unless certain exceptions apply.

Table of Contents

documents, or if you are currently enrolled in householding and wish to change your householding status.

Distribution

Table of Contents

Financial Highlights

Financial Highlights
(For a share outstanding throughout each period)

	iShares Interest Rate Hedged Long-Term Corporate Bond ETF
	Year Ended 10/31/21	Year Ended 10/31/20	Year Ended 10/31/19	Year Ended 10/31/18	Year Ended 10/31/17
Net asset value, beginning of year	$23.48	$24.31	$25.76	$25.98	$24.07
Net investment income^(a)	0.68	0.52	0.98	1.01	0.91
Net realized and unrealized gain (loss)^(b)	1.66	(0.70)	(1.01)	(0.32)	1.78
Net increase (decrease) from investment operations	2.34	(0.18)	(0.03)	0.69	2.69
Distributions^(c)
From net investment income	(0.46)	(0.65)	(0.96)	(0.91)	(0.76)
From net realized gain	(0.03)	—	(0.45)	—	—
Return of capital	—	—	(0.01)	—	(0.02)
Total distributions	(0.49)	(0.65)	(1.42)	(0.91)	(0.78)
Net asset value, end of year	$25.33	$23.48	$24.31	$25.76	$25.98
Total Return^(d)
Based on net asset value	10.01%	(0.69)%	(0.03)%	2.66%	11.36%
Ratios to Average Net Assets
Total expenses^(e)	0.35%	0.35%	0.35%	0.35%	0.35%
Total expenses after fees waived^(e)	0.10%	0.10%	0.10%	0.10%	0.10%
Net investment income	2.69%	2.22%	3.98%	3.86%	3.62%
Supplemental Data
Net assets, end of year (000)	$830,793	$557,715	$59,558	$57,954	$15,586
Portfolio turnover rate^(f)(g)	14%	18%	13%	5%	6%
^(a) Based on average shares outstanding.
^(b) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.
^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.
^(d) Where applicable, assumes the reinvestment of distributions.
^(e) The Fund indirectly bears its proportionate share of fees and expenses incurred by the underlying fund in which the Fund is invested (“acquired fund fees and expenses”). This ratio does not include these acquired fund fees and expenses.
^(f) Portfolio turnover rate excludes in-kind transactions.
^(g) Portfolio turnover rate excludes the portfolio activity of the underlying fund in which the Fund is invested. See the underlying fund's financial highlights for its respective portfolio turnover rates.

Table of Contents

Index Provider

Table of Contents

Disclaimers

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

Want to know more?

iShares.com | 1-800-474-2737

If you have any questions about the Trust or shares of the Fund or you wish to obtain the SAI, Semi-Annual or Annual Report free of charge, please:

Call:	1-800-iShares or 1-800-474-2737 (toll free) Monday through Friday, 8:30 a.m. to 6:30 p.m. (Eastern time)
Email:	iSharesETFs@blackrock.com
Write:	c/o BlackRock Investments, LLC 1 University Square Drive, Princeton, NJ 08540

Investment Company Act File No.: 811-22649

IS-P-IGBH-0322

	March 1, 2022

2022 Prospectus

iShares U.S. ETF Trust

•	BlackRock Short Maturity Bond ETF \| NEAR \| CBOE BZX

The Securities and Exchange Commission (“SEC”) has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

Table of Contents

Fund Overview	S-1
More Information About the Fund	1
A Further Discussion of Principal Risks	3
A Further Discussion of Other Risks	18
Portfolio Holdings Information	22
Management	22
Shareholder Information	25
Distribution	33
Financial Highlights	34
Disclaimers	35

iShares^® and BlackRock^® are registered trademarks of BlackRock Fund Advisors and its affiliates.

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

BLACKROCK^® SHORT MATURITY
BOND ETF

Ticker: NEAR

Stock Exchange: Cboe BZX

Investment Objective

The BlackRock Short Maturity Bond ETF (the “Fund”) seeks to maximize current income.

Fees and Expenses

The following table describes the fees and expenses that you will incur if you buy, hold and sell shares of the Fund. The investment advisory agreement between iShares U.S. ETF Trust (the “Trust”) and BlackRock Fund Advisors (“BFA”) (the “Investment Advisory Agreement”) provides that BFA will pay all operating expenses of the Fund, except: (i) the management fees, (ii) interest expenses, (iii) taxes, (iv) expenses incurred with respect to the acquisition and disposition of portfolio securities and the execution of portfolio transactions, including brokerage commissions, (v) distribution fees or expenses, and (vi) litigation expenses and extraordinary expenses. The Fund may incur “Acquired Fund Fees and Expenses.” Acquired Fund Fees and Expenses reflect the Fund's pro rata share of the fees and expenses incurred by investing in other investment companies. The impact of Acquired Fund Fees and Expenses is included in the total returns of the Fund. Acquired Fund Fees and Expenses are not included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Fund's prospectus (the “Prospectus”). BFA, the investment adviser to the Fund, has contractually agreed to waive a portion of its management fees in an amount equal to the Acquired Fund Fees and Expenses, if any, attributable to investments by the Fund in other funds advised by BFA, or its affiliates, through February 28, 2025. The contractual waiver may be terminated prior to February 28, 2025 only upon written agreement of the Trust and BFA.

You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Annual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investments)
Management Fees	Distribution and Service (12b-1) Fees	Other Expenses¹	Acquired Fund Fees and Expenses	Total Annual Fund Operating Expenses	Fee Waiver	Total Annual Fund Operating Expenses After Fee Waiver
0.25%	None	0.00%	0.00%	0.25%	(0.00)%	0.25%

¹	The amount rounded to 0.00%.

Example. This Example is intended to help you compare the cost of owning shares of the Fund with the cost of investing in other funds. The Example assumes that you

S-1

Table of Contents

invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

1 Year		3 Years		5 Years		10 Years
$26		$80		$141		$318

Portfolio Turnover. The Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 55% of the average value of its portfolio.

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing, under normal circumstances, at least 80% of its net assets in a portfolio of U.S. dollar-denominated investment-grade fixed-income securities. The Fund primarily invests in investment-grade fixed-income securities that are rated BBB- or higher by S&P Global Ratings and/or Fitch Ratings, Inc. (“Fitch”), or Baa3 or higher by Moody’s Investors Service, Inc. (“Moody's”), or, if unrated, determined by the Fund's management team to be of equivalent quality. The Fund primarily invests in fixed- and floating-rate securities of varying maturities, such as corporate and government bonds, agency securities,

instruments of non-U.S. issuers, privately issued securities, asset-backed securities (“ABS”) and mortgage-backed securities (“MBS”), structured securities, municipal bonds, repurchase agreements, money market instruments and investment companies. The Fund invests in securities issued by financial institutions such as banks, broker-dealers and insurance companies. The Fund may enter into to-be-announced transactions (“TBA transactions”) on a regular basis with respect to the percentage of the portfolio (if any) that consists of mortgage-backed pass-through securities. BFA or its affiliates may advise the money market funds and investment companies in which the Fund may invest.

Under normal circumstances, the effective duration of the Fund’s portfolio is expected to be one year or less, as calculated by the Fund's management team. Effective duration is a measure of the Fund’s price sensitivity to changes in yields or interest rates; however, investors should be aware that effective duration is not an exact measurement and may not reliably predict a particular security’s price sensitivity to changes in yield or interest rates.

Under normal circumstances, the Fund will also seek to maintain a weighted average maturity that is less than three years. Weighted average maturity is a U.S. dollar-weighted average of the

S-2

Table of Contents

remaining term to maturity of the underlying securities in the Fund’s portfolio. The calculation of the Fund's weighted average maturity is based on the constituent securities' final maturity date or, for amortizing securities such as asset-backed and mortgage-backed securities, their weighted average life (i.e., the average length of time that each dollar of unpaid principal on the security remains outstanding).

The Fund is an actively managed exchange-traded fund (“ETF”) that does not seek to replicate the performance of a specified index. The Fund may have a higher degree of portfolio turnover than funds that seek to replicate the performance of an index.

The Fund is not a money market fund and does not seek to maintain a stable net asset value of $1.00 per share. Please see the Fund’s Statement of Additional Information (“SAI”) for further information.

The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of the collateral received).

Summary of Principal Risks

As with any investment, you could lose all or part of your investment in the Fund, and the Fund's performance could trail that of other investments. The Fund is subject to certain risks, including the principal risks noted below, any of which may adversely affect the Fund's net asset value per share (“NAV”), trading price, yield, total return and ability to meet its investment objective. Unlike many ETFs, the Fund is not an index-based ETF. The order of the below risk factors does not indicate the significance of any particular risk factor.

Asset-Backed and Mortgage-Backed Securities Risk. ABS and MBS (residential and commercial) represent interests in “pools” of mortgages or other assets, including consumer loans or receivables held in trust. ABS and MBS are subject to credit, interest rate, call, extension, valuation and liquidity risk. These securities, in most cases, are not backed by the full faith and credit of the U.S. government and are subject to the risk of default on the underlying asset or mortgage, particularly during periods of economic downturn. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain ABS and MBS.

Asset Class Risk. Securities and other assets in the Fund's portfolio may underperform in comparison to the general financial markets, a particular financial market or other asset classes.

Authorized Participant Concentration Risk. Only an Authorized Participant (as defined in the Creations and Redemptions section of the Prospectus) may engage in creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting. Authorized Participant concentration

S-3

Table of Contents

risk may be heightened for ETFs, such as the Fund, that invest in securities issued by non-U.S. issuers or other securities or instruments that have lower trading volumes.

Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund may “call” or repay the security before its stated maturity, and the Fund may have to reinvest the proceeds in securities with lower yields, which would result in a decline in the Fund's income, or in securities with greater risks or with other less favorable features.

Cash Transactions Risk. The Fund may effect part or all of its creations and redemptions for cash, rather than in-kind securities. As a result, the Fund may have to sell portfolio securities at inopportune times in order to obtain the cash needed to meet redemption orders. This may cause the Fund to sell a security and recognize a capital gain or loss that might not have been incurred if it had made a redemption in-kind. The use of cash creations and redemptions may also cause the Fund’s shares to trade in the market at wider bid-ask spreads or greater premiums or discounts to the Fund’s NAV.

Credit Risk. Debt issuers and other counterparties may be unable or

unwilling to make timely interest and/or principal payments when due or otherwise honor their obligations. Changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may also adversely affect the value of the Fund’s investment in that issuer. The degree of credit risk depends on an issuer's or counterparty's financial condition and on the terms of an obligation.

Cybersecurity Risk. Failures or breaches of the electronic systems of the Fund, the Fund's adviser, distributor, and other service providers (including the benchmark provider), market makers, Authorized Participants or the issuers of securities in which the Fund invests have the ability to cause disruptions, negatively impact the Fund’s business operations and/or potentially result in financial losses to the Fund and its shareholders. While the Fund has established business continuity plans and risk management systems seeking to address system breaches or failures, there are inherent limitations in such plans and systems. Furthermore, the Fund cannot control the cybersecurity plans and systems of the Fund’s service providers, market makers, Authorized Participants or issuers of securities in which the Fund invests.

Extension Risk. During periods of rising interest rates, certain debt obligations may be paid off substantially more slowly than originally anticipated and the value of those securities may fall sharply, resulting in a decline in the Fund’s income and potentially in the value of the Fund’s investments.

Financials Sector Risk. Performance of companies in the financials sector may be adversely impacted by many factors,

S-4

Table of Contents

including, among others, changes in government regulations, economic conditions, and interest rates, credit rating downgrades, and decreased liquidity in credit markets. The extent to which the Fund may invest in a company that engages in securities-related activities or banking is limited by applicable law. The impact of changes in capital requirements and recent or future regulation of any individual financial company, or of the financials sector as a whole, cannot be predicted. In recent years, cyberattacks and technology malfunctions and failures have become increasingly frequent in this sector and have caused significant losses to companies in this sector, which may negatively impact the Fund.

Floating Rate Notes Risk. Securities with floating or variable interest rates can be less sensitive to interest rate changes than securities with fixed interest rates, but may decline in value if their coupon rates do not reset as high, or as quickly, as comparable market interest rates, and generally carry lower yields than fixed notes of the same maturity. Although floating rate notes are less sensitive to interest rate risk than fixed-rate securities, they are subject to credit risk and default risk, which could impair their value.

because the Fund may be unable to transact at advantageous times or prices. During periods of market volatility, liquidity in the market for the Fund’s shares may be impacted by the liquidity in the market for the underlying securities or instruments held by the Fund, which could lead to the Fund’s shares trading at a premium or discount to the Fund’s NAV.

Interest Rate Risk. During periods of very low or negative interest rates, the Fund may be unable to maintain positive

S-5

Table of Contents

returns or pay dividends to Fund shareholders. Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, result in heightened market volatility and detract from the Fund’s performance to the extent the Fund is exposed to such interest rates. Additionally, under certain market conditions in which interest rates are low and the market prices for portfolio securities have increased, the Fund may have a very low or even negative yield. A low or negative yield would cause the Fund to lose money in certain conditions and over certain time periods. An increase in interest rates will generally cause the value of securities held by the Fund to decline, may lead to heightened volatility in the fixed-income markets and may adversely affect the liquidity of certain fixed-income investments, including those held by the Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. The historically low interest rate environment heightens the risks associated with rising interest rates.

issuer of those securities may cause the value of the securities to decline.

Management Risk. The Fund is subject to management risk, which is the risk that the investment process, techniques and risk analyses applied by BFA will not produce the desired results, and that securities selected by BFA may underperform the market or any relevant benchmark. In addition, legislative, regulatory, or tax developments may affect the investment techniques available to BFA in connection with managing the Fund and may also adversely affect the ability of the Fund to achieve its investment objective.

S-6

Table of Contents

therefore, there can be no assurance as to whether, and/or the extent to which, the Fund's shares will trade at premiums or discounts to NAV. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

Municipal Securities Risk. Municipal securities can be significantly affected by political or economic changes, including changes made in the law after issuance of the securities, as well as uncertainties in the municipal market related to taxation, legislative changes or the rights of municipal security holders, including in connection with an issuer insolvency. Municipal securities backed by current or anticipated revenues from a specific project or specific assets can be negatively affected by the inability to collect revenues from such projects or assets. Certain municipal securities are issued by entities with limited taxing authority such as school districts, or are dependent on revenue from a particular sector or industry, such as the utilities sector, infrastructure sector, or transportation industry.

Not a Money Market Fund. The Fund is not a money market fund and is not

subject to the strict rules that govern the quality, maturity, liquidity and other features of securities that money market funds may purchase. Under normal circumstances, the Fund’s investments may be more susceptible than a money market fund is to credit risk, interest rate risk, valuation risk and other risks relevant to the Fund’s investments. The Fund does not seek to maintain a stable net asset value of $1.00 per share.

Privately Issued Securities Risk. The Fund may invest in privately issued securities, including those that are normally purchased pursuant to Rule 144A or Regulation S promulgated under the Securities Act of 1933, as amended (the “1933 Act”). Privately issued securities are securities that have not been registered under the 1933 Act and as a result may be subject

S-7

Table of Contents

to legal restrictions on resale. Privately issued securities are generally not traded on established markets. As a result of the absence of a public trading market, privately issued securities may be deemed to be illiquid investments, may be more difficult to value than publicly traded securities and may be subject to wide fluctuations in value. Delay or difficulty in selling such securities may result in a loss to the Fund.

Repurchase Agreement Risk. A repurchase agreement is an instrument under which the purchaser (i.e., the Fund) acquires a security and the seller agrees, at the time of the sale, to repurchase the security at a mutually agreed upon time and price. Repurchase agreements may be construed to be collateralized loans by the purchaser to the seller secured by the securities transferred to the purchaser. If a repurchase agreement is construed to be a collateralized loan, the underlying securities will not be considered to be owned by the Fund but only to constitute collateral for the seller’s obligation to pay the repurchase price. If the seller defaults on its obligation under the agreement, the Fund may suffer delays and incur costs or lose money in exercising its rights under the agreement. If the seller fails to repurchase the security and the market value of the security declines, the Fund may lose money.

experienced slower economic growth than some less developed countries. Certain developed countries have experienced security concerns, such as terrorism and strained international relations. Incidents involving a country’s or region’s security may cause uncertainty in its markets and may adversely affect its economy and the Fund’s investments. In addition, developed countries may be adversely impacted by changes to the economic conditions of certain key trading partners, regulatory burdens, debt burdens and the price or availability of certain commodities.

S-8

Table of Contents

other assets in the Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund's shares. Authorized Participants who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive fewer or more shares, or

lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

Performance Information

Year by Year Returns (Years Ended December 31)

The best calendar quarter return during the periods shown above was 3.59% in the 2nd quarter of 2020; the worst was -3.06% in the 1st quarter of 2020.

Updated performance information, including the Fund’s current NAV, may be obtained by visiting our website at www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).

S-9

Table of Contents

Average Annual Total Returns

(for the periods ended December 31, 2021)

	One Year	Five Years	Since Fund Inception
(Inception Date: 9/25/2013)
Return Before Taxes	0.34%	1.69%	1.41%
Return After Taxes on Distributions¹	0.03%	0.96%	0.81%
Return After Taxes on Distributions and Sale of Fund Shares¹	0.20%	0.98%	0.82%
Bloomberg Short-Term Government/Corporate Index² (Index returns do not reflect deductions for fees, expenses or taxes)	0.10%	1.41%	1.01%

²	The Bloomberg Short-Term Government/Corporate Index is an unmanaged index that measures the performance of government and corporate securities with less than one year remaining to maturity.

S-10

Table of Contents

Management

Investment Adviser. BlackRock Fund Advisors.

Portfolio Managers. Akiva Dickstein, Scott MacLellan, James Mauro and Scott Radell (the “Portfolio Managers”) are primarily responsible for the day-to-day management of the Fund. Each Portfolio Manager supervises a portfolio management team. Mr. MacLellan and Mr. Dickstein have been Portfolio Managers of the Fund since 2020. Mr. Mauro has been a Portfolio Manager of the Fund since 2021. Mr. Radell has been a Portfolio Manager of the Fund since 2013.

Purchase and Sale of Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

S-11

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

More Information About the Fund

The Fund is an actively managed ETF and, thus, does not seek to replicate the performance of a specified index. Accordingly, the management team has discretion on a daily basis to manage the Fund’s portfolio in accordance with the Fund’s investment objective.

ETFs are funds that trade like other publicly-traded securities. Similar to shares of a mutual fund, each share of the Fund represents an ownership interest in an underlying portfolio of securities and other instruments. Unlike shares of a mutual fund, which can be bought and redeemed from the issuing fund by all shareholders at a price based on NAV, shares of the Fund may be purchased or redeemed directly from the Fund at NAV solely by Authorized Participants and only in aggregations of a specified number of shares (“Creation Units”). Also unlike shares of a mutual fund, shares of the Fund are listed on a national securities exchange and trade in the secondary market at market prices that change throughout the day.

Additional Information on the Investment Strategies. The Fund’s investment objective is a non-fundamental policy and may be changed without shareholder approval. The Fund seeks to achieve its investment objective by investing, under normal circumstances, at least 80% of its net assets in a portfolio of U.S. dollar-denominated investment-grade fixed-income securities that are rated BBB- or higher by S&P Global Ratings and/or Fitch, or Baa3 or higher by Moody’s, or, if unrated, determined by the management team to be of equivalent quality. The Fund’s 80% investment policy may be changed by the Fund’s Board of Trustees (the “Board”) upon 60 days’ notice to shareholders.

The Fund primarily invests in fixed- and floating-rate securities of varying maturities, such as corporate and government bonds, agency securities, instruments of non-U.S. issuers, privately issued securities, ABS and MBS, structured securities, municipal bonds, money market instruments, repurchase agreements and investment companies. The Fund invests in securities issued by financial institutions such as banks, broker-dealers and insurance companies. BFA or its affiliates may advise the money market funds and investment companies in which the Fund may invest. The Fund may also invest in currency contracts for hedging and/or trade settlement purposes.

The Fund will invest in ABS and MBS. ABS are fixed-income securities that are backed by a pool of assets, usually loans such as installment sale contracts or credit card receivables. MBS are ABS based on a particular type of asset, a mortgage. There are a wide variety of MBS involving commercial or residential, fixed-rate or adjustable-rate mortgages and mortgages issued by banks or government agencies. Most transactions in fixed-rate mortgage pass-through securities occur through standardized contracts for future delivery in which the exact mortgage pools to be delivered are not specified

Table of Contents

until a few days prior to settlement, known as TBA transactions. The Fund may enter into such contracts on a regular basis. The Fund, pending settlement of such contracts, will invest the relevant assets in high-quality, liquid short-term instruments, including shares of money market funds affiliated with BFA. Collateralized mortgage obligations (“CMOs”) are fixed-income securities that are backed by cash flows from pools of mortgages. CMOs may have multiple classes with different payment rights and protections.

An investment in the Fund is not a bank deposit and it is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, BFA or any of its affiliates.

The Fund may, to a limited extent, engage in derivatives transactions that include futures contracts, options and swaps.

Investment Process. The management team evaluates sectors of the fixed-income market and individual securities within these sectors to invest the Fund’s assets on an ongoing basis. The investment approach represents a collaboration between the “Portfolio Teams,” who are responsible for setting the top-down asset allocation framework for portfolio construction and security selection, and the “Sector Specialists,” who are responsible for bottom-up idea generation, including research and analysis.

The investment process is centered around formal investment strategy meetings. Following discussions with their teams, the senior members of the Sector Specialists present their teams’ views during a meeting attended by fixed-income investment professionals within BlackRock. Next, the senior members of the Portfolio and Investment Teams, along with representatives from BlackRock’s Risk & Quantitative Analysis Group, hold a meeting to discuss asset allocation, portfolio risk, and investment themes. This meeting is designed to share ideas across Portfolio Teams as each determines the appropriate interest rate risk, convexity, term structure, credit quality, liquidity bias and sector allocations for individual strategies.

The Sector Specialists then implement the Portfolio Teams’ relative value outlook with respect to security selection, timing and execution, in accordance with the Fund’s investment objective and guidelines. Sector Specialists are also responsible for trading, which BlackRock believes best leverages its market knowledge and experience. While the investment themes are discussed formally on a weekly basis, the process is dynamic, with ongoing discussion and modifications as needed.

In certain situations or market conditions, the Fund may temporarily depart from its normal investment process, provided that such departure is, in the opinion of the management team, consistent with the Fund’s investment objective and in the best interests of the Fund. For example, the Fund may hold a higher than normal proportion of its assets in cash in response to adverse market, economic or political conditions.

The management team uses an internal model for calculating duration, which may result in a different value of duration than if duration was calculated by a third party.

Table of Contents

A Further Discussion of Principal Risks

Asset-Backed and Mortgage-Backed Securities Risk. ABS and MBS (residential and commercial) represent interests in “pools” of mortgages or other assets, including consumer loans or receivables held in trust. Although ABS generally experience less prepayment risk than residential mortgage-backed securities, MBS and ABS, like traditional fixed-income securities, are subject to credit, interest rate, call, extension, valuation and liquidity risk. Because of call and extension risk, ABS and MBS react differently to changes in interest rates than other bonds. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain ABS and MBS.

ABS and MBS may not be backed by the full faith and credit of the U.S. government and are subject to risk of default on the underlying mortgage or asset, particularly during periods of economic downturn.

MBS may be either pass-through securities or CMOs. Pass-through securities represent a right to receive principal and interest payments collected on a pool of mortgages, which are passed through to security holders. CMOs are created by dividing the principal and interest payments collected on a pool of mortgages into several revenue streams (tranches) with different priority rights to portions of the underlying mortgage payments. Certain CMO tranches may represent a right to receive interest only, principal only or an amount that remains after floating-rate tranches are paid (an inverse floater). These securities are frequently referred to as “mortgage derivatives” and may be extremely sensitive to changes in interest rates. Interest rates on inverse floaters, for example, vary inversely with a short-term floating rate (which may be reset periodically). Interest rates on inverse floaters will decrease when short-term rates increase, and will increase when short-term rates decrease. These securities have the effect of providing a degree of investment leverage. In response to changes in market interest rates or other market conditions, the value of an inverse floater may increase or decrease at a multiple of the increase or decrease in the value of the underlying securities. If the Fund invests in CMO tranches (including CMO tranches issued by government agencies) and interest rates move in a manner not anticipated by Fund management, it is possible that the Fund could lose all or substantially all of its investment.

In response to the financial crisis that began in 2008, the Federal Reserve System (the “Fed”) attempted to keep mortgage rates low by acting as a buyer of mortgage-backed assets. This support has ended. As a result, mortgage rates may rise and values of MBS and ABS may fall.

Table of Contents

market segments, asset classes or sectors. Various types of securities may experience cycles of outperformance and underperformance in comparison to the general financial markets depending upon a number of factors including, among other things, inflation, interest rates, productivity, global demand for local products or resources, and regulation and governmental controls. This may cause the Fund to underperform other investment vehicles that invest in different asset classes.

Authorized Participant Concentration Risk. Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem Creation Units, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting. Authorized Participant concentration risk may be heightened because ETFs, such as the Fund, that invest in securities issued by non-U.S. issuers or other securities or instruments that are less widely traded often involve greater settlement and operational issues and capital costs for Authorized Participants, which may limit the availability of Authorized Participants.

Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund may “call” or repay the security before its stated maturity, and the Fund may have to reinvest the proceeds in securities with lower yields, which would result in a decline in the Fund’s income, or in securities with greater risks or with other less favorable features.

Cash Transactions Risk. The Fund may effect part or all of its creations and redemptions for cash, rather than in-kind securities. Paying redemption proceeds in cash rather than through in-kind delivery of portfolio securities may require the Fund to dispose of or sell portfolio securities or other assets at an inopportune time to obtain the cash needed to meet redemption orders. This may cause the Fund to sell a security and recognize a capital gain or loss that might not have been incurred if it had made a redemption in-kind. As a result, the Fund may pay out higher or lower annual capital gains distributions than ETFs that redeem in-kind. The use of cash creations and redemptions may also cause the Fund’s shares to trade in the market at greater bid-ask spreads or greater premiums or discounts to the Fund’s NAV. Furthermore, the Fund may not be able to execute cash transactions for creation and redemption purposes at the same price used to determine the Fund’s NAV. To the extent that the maximum additional charge for creation or redemption transactions is insufficient to cover the execution shortfall, the Fund’s performance could be negatively impacted.

Table of Contents

the underperformance of those securities and/or other assets, may experience increased price volatility and may be more susceptible to adverse economic, market, political or regulatory occurrences affecting those securities and/or other assets than a fund that does not concentrate its investments.

Table of Contents

continuity plans in the event of, and risk management systems to prevent, such cyber incidents, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, that prevention and remediation efforts will not be successful or that cyberattacks will go undetected. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund, issuers in which the Fund invests, market makers or Authorized Participants. The Fund and its shareholders could be negatively impacted as a result.

Table of Contents

sector and have reportedly caused losses to companies in this sector, which may negatively impact the Fund.

Floating Rate Notes Risk. Securities with floating or variable interest rates can be less sensitive to interest rate changes than securities with fixed interest rates, but may decline in value if their interest rates do not rise as much, or as quickly, as interest rates in general. Conversely, floating rate securities will not generally increase in value if interest rates decline. A decline in interest rates may result in a reduction in income received from floating rate securities held by the Fund and may adversely affect the value of the Fund’s shares. Generally, floating rate securities carry lower yields than fixed notes of the same maturity. The interest rate for a floating rate note resets or adjusts periodically by reference to a benchmark interest rate. The impact of interest rate changes on floating rate investments is typically mitigated by the periodic interest rate reset of the investments. Securities with longer durations tend to be more sensitive to interest rate changes, usually making them more volatile than securities with shorter durations. Floating rate notes generally are subject to legal or contractual restrictions on resale, may trade infrequently, and their value may be impaired when the Fund needs to liquidate such loans. Benchmark interest rates, such as the London Interbank Offered Rate (“LIBOR”) or the Secured Overnight Financing Rate (“SOFR”), may not accurately track market interest rates.

Although floating rate notes are less sensitive to interest rate risk than fixed-rate securities, they are subject to credit risk and default risk, which could impair their value.

Table of Contents

investments in the market and contributing to illiquid investments risk and downward pricing pressure. During periods of market volatility, liquidity in the market for the Fund’s shares may be impacted by the liquidity in the market for the underlying securities or instruments held by the Fund, which could lead to the Fund’s shares trading at a premium or discount to the Fund's NAV.

Income Risk. The Fund’s income may decline if interest rates fall because the Fund may hold a significant portion of short duration securities and/or securities that have floating or variable interest rates. The Fund’s income may decline because the Fund invests in lower yielding bonds, and as bonds in its portfolio mature, are near maturity or are called, the Fund needs to purchase additional bonds.

■	General Impact. This outbreak has resulted in travel restrictions, closed international borders, enhanced health screenings at ports of entry and elsewhere, disruption of, and delays in, healthcare service preparation and delivery, prolonged quarantines, cancellations, supply chain disruptions, lower consumer demand, temporary and permanent closures of stores, restaurants and other commercial establishments, layoffs, defaults and other significant economic impacts, as well as general concern and uncertainty.
■	Market Volatility. The outbreak has also resulted in extreme volatility, severe losses, and disruptions in markets which can adversely impact the Fund and its investments, including impairing hedging activity to the extent the Fund engages in such activity, as expected correlations between related markets or instruments may no longer apply. In addition, to the extent the Fund invests in short-term instruments that have negative yields, the Fund’s value may be impaired as a result. Certain issuers of equity securities have cancelled or announced the suspension of dividends. The outbreak has, and may continue to, negatively affect the credit ratings of some fixed-income securities and their issuers.
■	Market Closures. Certain local markets have been or may be subject to closures, and there can be no assurance that trading will continue in any local markets in which the Fund may invest, when any resumption of trading will occur or, once such markets resume trading, whether they will face further closures. Any suspension of trading in markets in which the Fund invests will have an impact on the Fund and its investments and will impact the Fund’s ability to purchase or sell securities in such markets.
■	Operational Risk. The outbreak could also impair the information technology and other operational systems upon which the Fund’s service providers, including BFA, rely, and could otherwise disrupt the ability of employees of the Fund's service

Table of Contents

	providers to perform critical tasks relating to the Fund, for example, due to the service providers’ employees performing tasks in alternate locations than under normal operating conditions or the illness of certain employees of the Fund's service providers.
■	Governmental Interventions. Governmental and quasi-governmental authorities and regulators throughout the world have responded to the outbreak and the resulting economic disruptions with a variety of fiscal and monetary policy changes, including direct capital infusions into companies and other issuers, new monetary policy tools, and lower interest rates. An unexpected or sudden reversal of these policies, or the ineffectiveness of such policies, is likely to increase market volatility, which could adversely affect the Fund’s investments.
■	Pre-Existing Conditions. Public health crises caused by the outbreak may exacerbate other pre-existing political, social and economic risks in certain countries or globally, which could adversely affect the Fund and its investments and could result in increased premiums or discounts to the Fund's NAV.

Other infectious illness outbreaks that may arise in the future could have similar or other unforeseen effects.

Table of Contents

set at low levels and the market prices of portfolio securities have increased, the Fund may have a very low or even negative yield. A low or negative yield would cause the Fund to lose money in certain conditions and over certain time periods. Central banks may increase their short-term policy rates or begin phasing out, or “tapering,” accommodative monetary policy facilities in the future. The timing, coordination, magnitude and effect of such policy changes on various markets are uncertain, and such changes in monetary policy may adversely affect the value of the Fund’s investments.

Issuer Risk. The performance of the Fund depends on the performance of individual securities to which the Fund has exposure. The Fund may be adversely affected if an issuer of underlying securities held by the Fund is unable or unwilling to repay principal or interest when due. Any issuer of these securities may perform poorly, causing the value of its securities to decline. Poor performance may be caused by poor management decisions, competitive pressures, changes in technology, expiration of patent protection, disruptions in supply, labor problems or shortages, corporate restructurings, fraudulent disclosures, credit deterioration of the issuer or other factors. Changes to the financial condition or credit rating of an issuer of those securities may cause the value of the securities to decline. An issuer may also be subject to risks associated with the countries, states and regions in which the issuer resides, invests, sells products, or otherwise conducts operations.

Management Risk. The Fund is subject to management risk because it does not seek to replicate the performance of a specified index. BFA and the portfolio managers will utilize a proprietary investment process, techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that these decisions will produce the desired results. In addition, legislative, regulatory, or tax developments may affect the investment techniques available to BFA in connection with managing the Fund and may also adversely affect the ability of the Fund to achieve its investment objective.

Market Risk. The Fund could lose money over short periods due to short-term market movements and over longer periods during more prolonged market downturns. Market risk arises mainly from uncertainty about future values of financial instruments and may be influenced by price, currency and interest rate movements. It represents the potential loss the Fund may suffer through holding financial instruments in the face of market movements or uncertainty. The value of a security or other asset may decline due to changes in general market conditions, economic trends or events that are not specifically related to the issuer of the security or other asset, or factors that affect a particular issuer or issuers, country, group of countries, region, market, industry, group of industries, sector or asset class. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund and its investments and could result in increased premiums or discounts to the Fund’s NAV. During a general market downturn, multiple asset classes may be negatively affected. Fixed-income securities

Table of Contents

with short-term maturities are generally less sensitive to such changes than are fixed-income securities with longer-term maturities. Changes in market conditions and interest rates generally do not have the same impact on all types of securities and instruments.

Market Trading Risk.

Table of Contents

NAV during periods of market volatility, including during periods of significant redemption requests or other unusual market conditions. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV. However, because shares can be created and redeemed in Creation Units at NAV, BFA believes that large discounts or premiums to the NAV of the Fund are not likely to be sustained over the long term (unlike shares of many closed-end funds, which frequently trade at appreciable discounts from, and sometimes at premiums to, their NAVs). While the creation/redemption feature is designed to make it more likely that the Fund’s shares normally will trade on stock exchanges at prices close to the Fund’s next calculated NAV, exchange prices are not expected to correlate exactly with the Fund's NAV due to timing reasons, supply and demand imbalances and other factors. In addition, disruptions to creations and redemptions, including disruptions at market makers, Authorized Participants, or other market participants, and during periods of significant market volatility, may result in trading prices for shares of the Fund that differ significantly from its NAV. Authorized Participants may be less willing to create or redeem Fund shares if there is a lack of an active market for such shares or its underlying investments, which may contribute to the Fund’s shares trading at a premium or discount to NAV.

Municipal Securities Risk. Municipal securities include both general obligation bonds (bonds secured by the full faith and credit of the issuer) and limited obligation bonds (or “Revenue Bonds”). All municipal securities are subject to the risk that litigation, legislation or other political events, local business or economic conditions, credit rating downgrades, or the bankruptcy of the issuer could have a significant effect on an issuer’s ability to make payments of principal and/or interest or otherwise affect the value of such securities. Additionally, certain municipal securities may be issued by entities with limited taxing authority, which could limit or prevent tax increases necessary to make continued payments of principal and interest.

Table of Contents

rights of municipal security holders, including in connection with an issuer insolvency. There is also the risk that corruption may negatively affect municipal issuers, including corruption related to a particular project from which payments on a security are derived, resulting in delays and cost overruns.

There may be less publicly available information on the financial condition of municipal security issuers than for issuers of other securities. As a result, municipal securities may be more difficult for the Fund to value accurately than the securities of public companies. Municipal securities may also be harder to buy and sell compared to taxable bonds and non-municipal securities, especially on short notice. Because the Fund invests a significant portion of its portfolio in municipal securities, the Fund’s portfolio is subject to greater exposure to illiquidity risk than a fund that invests in comparable taxable bonds or non-municipal securities.

The Fund and BFA will rely on the opinion of issuers’ bond counsel on the tax-exempt status of interest on municipal bonds. Neither the Fund nor BFA will independently review the bases for those tax opinions, which may ultimately be determined to be incorrect, potentially resulting in the Fund and its shareholders being subject to substantial tax liabilities. In addition, changes in the financial condition of an individual municipal issuer can affect the overall municipal market.

Revenue Bonds are backed by current or anticipated revenues from a specific project or specific assets and can be negatively affected by the discontinuance of the tax benefits supporting the project or assets or the inability to collect revenues from the project or the assets. Additionally, the market values of Revenue Bonds may decline in times of higher inflation to the extent that revenues are fixed income streams. In other instances, the prices that an issuer is able to charge users of its assets may be linked to inflation, whether by government regulation, contractual arrangement or other factors. Rising interest rates could result in higher costs of capital for certain issuers, which could negatively impact their ability to meet payment obligations. In this case, changes in the rate of inflation may affect the issuer’s revenues. Because many municipal securities are issued to finance projects, such as those related to education, health care, housing, transportation, utilities, and water and sewer, conditions in one or more of these sectors can affect the overall municipal market. Adverse conditions and developments affecting a particular project can result in lower revenues to an issuer of the municipal securities and, by extension, adversely affect payments of principal and interest on, or the market value of, such securities.

Additionally, certain municipal securities are issued by entities dependent on revenue from a particular sector and thus are subject to the specific risks associated with that sector.

Risk of Investing in Infrastructure-Related Municipal Securities. Entities that issue municipal securities related to infrastructure (“infrastructure issuers”) may be subject to a variety of factors that could adversely affect their capacity to make principal and interest payments, such as high interest costs in connection with capital construction programs, high degrees of leverage, costs associated with governmental, environmental and other regulations, the effects of economic slowdowns, increased competition from other providers of services, uncertainties concerning costs, the level of government spending on infrastructure projects, and other factors. Such issuers

Table of Contents

may be adversely affected by commodity price volatility, changes in exchange rates, import controls, depletion of resources, technological developments, and labor relations. Infrastructure issuers can be significantly affected by government spending policies.

Leverage Risk. Infrastructure issuers can be highly indebted, which increases investment risk and other risks normally associated with debt financing, which could adversely affect such an issuer’s operations and the market value of related municipal securities in periods of rising interest rates.

Operations Risk. The failure of an infrastructure issuer to carry adequate insurance or to operate its assets appropriately could lead to significant losses. Infrastructure may be adversely affected by environmental clean-up costs and catastrophic events such as earthquakes, hurricanes and terrorist acts.

Regulatory Risk. Infrastructure projects may be subject to significant regulation by various governmental authorities and also may be affected by regulation of rates charged to customers, service interruption due to environmental, operational or other events, the imposition of special tariffs and changes in tax laws, regulatory policies and accounting standards.

Strategic Asset Risk. Infrastructure issuers may control significant strategic assets (e.g., major pipelines or highways), which are assets that have a national or regional profile, and may have monopolistic characteristics. Given their national or regional profile or irreplaceable nature, strategic assets could generate additional risk not common in other industry sectors and they may be targeted for terrorist acts or adverse political actions.

User Risk. Infrastructure issuers can be dependent upon a narrow user base. If these users do not patronize infrastructure projects as expected, significant revenues could be lost and may not be replaceable, in which case infrastructure issuers may fail to pay their obligations.

Risk of Investing in Municipal Securities Issued By School Districts. School districts rely, in part, on funding appropriations from, among others, the federal government and state governments. As a result, municipal securities issued by school districts may be adversely affected by political and economic changes at the state or federal levels, such as decreased tax or other revenues, spending reductions or changes in appropriations. Municipal securities that are issued to finance a particular school district project often depend on revenues from ad valorem taxes (i.e., property taxes) to make principal and interest payments. Investors in these securities, similar to investors in municipal securities generally, face heightened risk of loss upon insolvency of the school district issuers because there is often no ready source of funding to pay principal and interest other than the local tax base, which a bankruptcy court or administrator does not control.

Table of Contents

Municipal securities that are issued to finance a particular transportation project (e.g., toll roads) often depend on revenues from that project to make principal and interest payments.

Risk of Investing in Utility-Related Municipal Securities. Certain municipal securities are issued by public bodies, including state and municipal utility authorities, to, among other things, finance the operation or expansion of utility entities. Various future economic and other conditions may adversely affect utility entities, including inflation, increases in financing requirements, increases in raw material costs and other operating costs, changes in demand for services and the effects of environmental and other governmental regulations. Certain utilities are subject to specific risks. For example, gas utilities are subject to risks of supply conditions and increased competition from other providers of utility services. In addition, gas utilities are affected by gas prices, which may be magnified to the extent that a gas utility enters into long-term contracts for the purchase or sale of gas at a fixed price, since such prices may change significantly and to the disadvantage of the gas utility.

Not a Money Market Fund. The Fund is not a money market fund and is not subject to the strict rules that govern the quality, maturity, liquidity and other features of securities that money market funds may purchase. Under normal circumstances, the Fund’s investments may be more susceptible than a money market fund is to credit risk, interest rate risk, valuation risk and other risks relevant to the Fund’s investments. The Fund does not seek to maintain a stable net asset value of $1.00 per share.

Operational Risk. The Fund is exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund's service providers, counterparties or other third parties, failed or inadequate processes and technology or systems failures. The Fund and BFA seek to reduce these operational risks through controls and procedures. However,

Table of Contents

these measures do not address every possible risk and may be inadequate to address significant operational risks.

Prepayment Risk. During periods of falling interest rates, issuers of certain debt obligations may repay principal prior to the security’s maturity, which may cause the Fund to have to reinvest in securities with lower yields or higher risk of default, resulting in a decline in the Fund’s income or return potential. Also, if a security subject to prepayment had been purchased at a premium, the value of the premium would be lost in the event of prepayment.

Privately Issued Securities Risk. The Fund may invest in privately issued securities, including those that are normally purchased pursuant to Rule 144A or Regulation S under the 1933 Act. Privately issued securities typically may be resold only to qualified institutional buyers, or in a privately negotiated transaction, or to a limited number of purchasers, or in limited quantities after they have been held for a specified period of time and other conditions are met for an exemption from registration. Because there may be relatively few potential purchasers for such securities, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer, the Fund may find it more difficult to sell such securities when it may be advisable to do so or it may be able to sell such securities only at prices lower than if such securities were more widely held and traded. At times, it also may be more difficult to determine the fair value of such securities for purposes of computing the Fund’s NAV due to the absence of an active trading market. There can be no assurance that a privately issued security that is deemed to be liquid when purchased will continue to be liquid for as long as it is held by the Fund, and its value may decline as a result.

Table of Contents

concerns and other security concerns. These situations may cause uncertainty in the financial markets in these countries or geographic areas and may adversely affect the performance of the issuers to which the Fund has exposure. Heavy regulation of certain markets, including labor and product markets, may have an adverse effect on certain issuers. Such regulations may negatively affect economic growth or cause prolonged periods of recession. Many developed countries are heavily indebted and face rising healthcare and retirement expenses. In addition, price fluctuations of certain commodities and regulations impacting the import of commodities may negatively affect developed country economies.

Securities Lending Risk. The Fund may engage in securities lending. Securities lending involves the risk that the Fund may lose money because the borrower of the loaned securities fails to return the securities in a timely manner or at all. The Fund could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. These events could also trigger adverse tax consequences for the Fund. BlackRock Institutional Trust Company, N.A. (“BTC”), the Fund's securities lending agent, will take into account the tax impact to shareholders of substitute payments for dividends when managing the Fund's securities lending program.

Table of Contents

the Fund not fair-valued securities or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

A Further Discussion of Other Risks

Cash Management Risk. To the extent the Fund holds cash, the Fund will earn reduced income (if any) on the cash and will be subject to the credit risk of the depository institution holding the cash and any fees imposed on large cash balances. If a significant amount of the Fund’s assets are invested in cash and cash equivalents, it will be more difficult for the Fund to achieve its investment objective. The Fund may underperform other funds that do not similarly invest in cash and cash equivalents for investment purposes and/or to collateralize derivative instruments.

Commercial Mortgage-Backed Securities Risk. The CMBS in which the Fund invests may be issued by entities, such as banks, mortgage lenders or other institutions. These entities are not backed by the full faith and credit of the U.S. government, and there can be no assurance that the U.S. government would provide financial support to its agencies or instrumentalities where it is not obligated to do so.

CMBS depend on cash flows generated by underlying commercial real-estate loans, receivables or other assets, and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the underlying assets.

Due to the nature of the loans they represent, CMBS are subject to a greater degree of prepayment and extension risk than many other forms of fixed-income securities. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain CMBS. Certain CMBS are issued in several classes with different levels of yield and credit protection. The Fund’s investments in CMBS with several classes may be in the lower classes that have greater risks than the higher classes, including greater interest rate, credit, prepayment and extension risks.

In addition, the value of CMBS may be adversely affected by regulatory or tax changes. CMBS issued by non-government entities may offer higher yields than those issued by

Table of Contents

government entities, but also may be subject to greater volatility than government issues. In the recent past, the market for CMBS has experienced volatility and reduced liquidity.

Table of Contents

terms of their future trading relationship effective January 1, 2021, which principally relates to the trading of goods rather than services, including financial services. Further discussions are to be held between the U.K. and the EU in relation to matters not covered by the trade agreement, such as financial services. The Fund faces risks associated with the potential uncertainty and consequences that may follow Brexit, including with respect to volatility in exchange rates and interest rates. Brexit could adversely affect European or worldwide political, regulatory, economic or market conditions and could contribute to instability in global political institutions, regulatory agencies and financial markets. Brexit has also led to legal uncertainty and could lead to politically divergent national laws and regulations as a new relationship between the U.K. and EU is defined and the U.K. determines which EU laws to replace or replicate. Any of these effects of Brexit could adversely affect any of the companies to which the Fund has exposure and any other assets in which the Fund invests. The political, economic and legal consequences of Brexit are not yet fully known. In the short term, financial markets may experience heightened volatility, particularly those in the U.K. and Europe, but possibly worldwide. The U.K. and Europe may be less stable than they have been in recent years, and investments in the U.K. and the EU may be difficult to value or subject to greater or more frequent volatility. In the longer term, there is likely to be a period of significant political, regulatory and commercial uncertainty as the U.K. continues to negotiate the terms of its future trading relationships.

LIBOR Risk. The Fund may be exposed to financial instruments that are tied to LIBOR to determine payment obligations, financing terms, hedging strategies or investment value. The Fund’s investments may pay interest at floating rates based on LIBOR or may be subject to interest caps or floors based on LIBOR. The Fund may also obtain financing at floating rates based on LIBOR. Derivative instruments utilized by the Fund may also reference LIBOR.

Table of Contents

representative of the interest rates in the underlying market. The Fund may have investments linked to other interbank offered rates, such as the Euro Overnight Index Average (“EONIA”), which may also cease to be published. Various financial industry groups continue planning for the transition away from LIBOR, but there are challenges to converting certain securities and transactions to a new reference rate, such as SOFR, which is intended to replace USD LIBOR. For example, at times, SOFR has proven to be more volatile than the 3-month USD LIBOR. Working groups and regulators in other countries have suggested other alternatives for their markets, including the Sterling Overnight Interbank Average Rate (“SONIA”) in England.

Money Market Instruments Risk. The value of money market instruments may be affected by changing interest rates and by changes in the credit ratings of the investments. If a significant amount of the Fund's assets are invested in money market instruments, it will be more difficult for the Fund to achieve its investment objective. An investment in a money market fund is not insured or guaranteed by the FDIC or any other government agency. It is possible to lose money by investing in a money market fund. Money market funds other than government money market funds or retail money market funds “float” their NAV instead of using a stable $1.00 per share price.

Threshold/Underinvestment Risk. If certain aggregate and/or fund-level ownership thresholds are reached through transactions undertaken by BFA, its affiliates or the Fund, or as a result of third-party transactions or actions by an issuer or regulator, the ability of BFA and its affiliates on behalf of clients (including the Fund) to purchase or dispose of investments, or exercise rights or undertake business transactions, may be restricted by regulation or otherwise impaired. The capacity of the Fund to make investments in certain securities may be affected by the relevant threshold limits, and such limitations may have adverse effects on the liquidity and performance of the Fund’s portfolio holdings.

For example, in certain circumstances where the Fund invests in securities issued by companies that operate in certain regulated industries or in certain emerging or

Table of Contents

international markets, is subject to corporate or regulatory ownership restrictions, or invests in certain futures or other derivative transactions, there may be limits on the aggregate and/or fund-level amount invested or voted by BFA and its affiliates for their proprietary accounts and for client accounts (including the Fund) that may not be exceeded without the grant of a license or other regulatory or corporate consent or, if exceeded, may cause BFA and its affiliates, the Fund or other client accounts to suffer disadvantages or business restrictions.

Portfolio Holdings Information

A description of the Trust's policies and procedures with respect to the disclosure of the Fund’s portfolio securities is available in the Fund's SAI. The Fund discloses its portfolio holdings daily at www.iShares.com. Fund fact sheets provide information regarding the Fund's top holdings and may be requested by calling 1-800-iShares (1-800-474-2737).

Management

Investment Adviser. As investment adviser, BFA has overall responsibility for the general management and administration of the Fund. BFA provides an investment program for the Fund and manages the investment of the Fund’s assets. In managing the Fund, BFA may draw upon the trading, research and expertise of its asset management affiliates for portfolio decisions and management with respect to portfolio securities. In seeking to achieve the Fund's investment objective, BFA uses teams of portfolio managers, investment strategists and other investment specialists. This team approach brings together many disciplines and leverages BFA’s extensive resources.

Pursuant to the Investment Advisory Agreement between BFA and the Trust (entered into on behalf of the Fund), BFA is responsible for substantially all expenses of the Fund, except the management fees, interest expenses, taxes, expenses incurred with respect to the acquisition and disposition of portfolio securities and the execution of portfolio transactions, including brokerage commissions, distribution fees or expenses, and litigation expenses and extraordinary expenses (as determined by a majority of the Trustees who are not “interested persons” of the Trust). The Fund may also pay “Acquired Fund Fees and Expenses.”

For its investment advisory services to the Fund, BFA is paid a management fee from the Fund based on a percentage of the Fund’s average daily net assets, at the annual rate of 0.25%. BFA has contractually agreed to waive a portion of its management fees in an amount equal to the Acquired Fund Fees and Expenses, if any, attributable to investments by the Fund in other funds advised by BFA, or its affiliates, through February 28, 2025. The contractual waiver may be terminated prior to February 28, 2025 only upon written agreement of the Trust and BFA. In addition, BFA may from time to time voluntarily waive and/or reimburse fees or expenses in order to limit total annual fund operating expenses (excluding acquired fund fees and expenses, if any). Any such voluntary waiver or reimbursement may be eliminated by BFA at any time.

BFA is located at 400 Howard Street, San Francisco, CA 94105. It is an indirect wholly owned subsidiary of BlackRock, Inc. (“BlackRock”). As of December 31, 2021, BFA and

Table of Contents

its affiliates provided investment advisory services for assets in excess of $10.01 trillion. BFA and its affiliates trade and invest for their own accounts in the types of securities in which the Fund may also invest.

A discussion regarding the basis for the approval by the Board of the Investment Advisory Agreement with BFA is available in the Fund's Annual Report for the period ended October 31.

Portfolio Managers. Scott MacLellan, CFA and Akiva Dickstein are primarily responsible for the day-to-day management of the Fund and consult regularly with James Mauro and Scott Radell. Each Portfolio Manager is responsible for various functions related to portfolio management, including, but not limited to, developing and implementing the Fund’s investment process and investment strategy, researching and reviewing investment strategy and overseeing members of his portfolio management team that have more limited responsibilities.

Akiva Dickstein has been employed by BlackRock as a portfolio manager since 2009. Mr. Dickstein has been a Portfolio Manager of the Fund since 2020.

Scott MacLellan, CFA has been employed by BlackRock since 2001. Mr. MacLellan has been employed by BlackRock as a portfolio manager since 2012 and has been a Portfolio Manager of the Fund since 2020.

Scott Radell has been employed by BFA or its affiliates as a portfolio manager since 2004. Mr. Radell was a credit strategist from 2003 to 2004 and became a portfolio manager at Barclays Global Fund Advisors in 2004. Mr. Radell has been a Portfolio Manager of the Fund since 2013.

Conflicts of Interest. The investment activities of BFA and its affiliates (including BlackRock and its subsidiaries (collectively, the “Affiliates”)), and their respective

Table of Contents

directors, officers or employees, in the management of, or their interest in, their own accounts and other accounts they manage, may present conflicts of interest that could disadvantage the Fund and its shareholders. BFA and its Affiliates provide investment management services to other funds and discretionary managed accounts that may follow investment programs similar to that of the Fund. BFA and its Affiliates are involved worldwide with a broad spectrum of financial services and asset management activities and may engage in the ordinary course of business in activities in which their interests or the interests of their clients may conflict with those of the Fund. BFA or one or more Affiliates act, or may act, as an investor, research provider, investment manager, commodity pool operator, commodity trading advisor, financier, underwriter, adviser, trader, lender, index provider, agent and/or principal, and have other direct and indirect interests in securities, currencies, commodities, derivatives and other instruments in which the Fund may directly or indirectly invest. The Fund may invest in securities of, or engage in other transactions with, companies with which an Affiliate has significant debt or equity investments or other interests. The Fund may also invest in issuances (such as structured notes) by entities for which an Affiliate provides and is compensated for cash management services relating to the proceeds from the sale of such issuances. The Fund also may invest in securities of, or engage in other transactions with, companies for which an Affiliate provides or may in the future provide research coverage. An Affiliate may have business relationships with, and purchase or distribute or sell services or products from or to, distributors, consultants or others who recommend the Fund or who engage in transactions with or for the Fund, and may receive compensation for such services. The Fund may also invest in sovereign issuers that are advised by an Affiliate with respect to their debt offerings. BFA or one or more Affiliates may engage in proprietary trading and advise accounts and funds that have investment objectives similar to those of the Fund and/or that engage in and compete for transactions in the same types of securities, currencies and other instruments as the Fund. This may include transactions in securities issued by other open-end and closed-end investment companies (which may include investment companies that are affiliated with the Fund and BFA, to the extent permitted under the Investment Company Act of 1940, as amended (the “1940 Act”)). The trading activities of BFA and these Affiliates are carried out without reference to positions held directly or indirectly by the Fund and may result in BFA or an Affiliate having positions in certain securities that are senior or junior to, or have interests different from or adverse to, the securities that are owned by the Fund.

Table of Contents

Affiliates may adversely impact the Fund. Transactions by one or more clients or by BFA or its Affiliates or their directors, officers or employees may have the effect of diluting or otherwise disadvantaging the values, prices or investment strategies of the Fund.

The Fund's activities may be limited because of regulatory restrictions applicable to BFA or one or more Affiliates and/or their internal policies designed to comply with such restrictions.

Shareholder Information

Table of Contents

addition, you may incur the cost of the “spread,” that is, any difference between the bid price and the ask price. The spread varies over time for shares of the Fund based on the Fund’s trading volume and market liquidity, and is generally lower if the Fund has high trading volume and market liquidity, and higher if the Fund has little trading volume and market liquidity (which is often the case for funds that are newly launched or small in size). The Fund's spread may also be impacted by the liquidity or illiquidity of the underlying securities held by the Fund, particularly for newly launched or smaller funds or in instances of significant volatility of the underlying securities.

The Board has adopted a policy of not monitoring for frequent purchases and redemptions of Fund shares (“frequent trading”) that appear to attempt to take advantage of a potential arbitrage opportunity presented by a lag between a change in the value of the Fund’s portfolio securities after the close of the primary markets for the Fund’s portfolio securities and the reflection of that change in the Fund’s NAV (“market timing”), because the Fund sells and redeems its shares directly through transactions that are in-kind and/or for cash, subject to the conditions described below under Creations and Redemptions. The Board has not adopted a policy of monitoring for other frequent trading activity because shares of the Fund are listed for trading on a national securities exchange.

Table of Contents

Share Prices. The trading prices of the Fund’s shares in the secondary market generally differ from the Fund’s daily NAV and are affected by market forces such as the supply of and demand for ETF shares and underlying securities held by the Fund, economic conditions and other factors.

The value of the securities and other assets and liabilities held by the Fund is determined pursuant to valuation policies and procedures approved by the Board.

Generally, trading in non-U.S. securities and money market instruments is substantially completed each day at various times prior to the close of regular trading hours of the NYSE. The values of such securities used in computing the NAV of the Fund are determined as of such times.

Table of Contents

BFA may conclude that a market quotation is not readily available or is unreliable if a security or other asset or liability does not have a price source due to its lack of trading or other reasons, if a market quotation differs significantly from recent price quotations or otherwise no longer appears to reflect fair value, where the security or other asset or liability is thinly traded, when there is a significant event subsequent to the most recent market quotation, or if the trading market on which a security is listed is suspended or closed and no appropriate alternative trading market is available. A “significant event” is deemed to occur if BFA determines, in its reasonable business judgment prior to or at the time of pricing the Fund’s assets or liabilities, that the event is likely to cause a material change to the last exchange closing price or closing market price of one or more assets held by, or liabilities of, the Fund.

Dividends and Distributions

General Policies. Dividends from net investment income, if any, generally are declared and paid at least once a year by the Fund. Distributions of net realized securities gains, if any, generally are declared and paid once a year, but the Trust may make distributions on a more frequent basis for the Fund. The Trust reserves the right to declare special distributions if, in its reasonable discretion, such action is necessary or advisable to preserve its status as a regulated investment company or to avoid imposition of income or excise taxes on undistributed income or realized gains.

Taxes. As with any investment, you should consider how your investment in shares of the Fund will be taxed. The tax information in this Prospectus is provided as general information, based on current law. There is no guarantee that shares of the Fund will receive certain regulatory or accounting treatment. You should consult your own tax professional about the tax consequences of an investment in shares of the Fund.

Table of Contents

If your Fund shares are loaned out pursuant to a securities lending arrangement, you may lose the ability to use foreign tax credits passed through by the Fund.

Table of Contents

If you are neither a resident nor a citizen of the U.S. or if you are a non-U.S. entity (other than a pass-through entity to the extent owned by U.S. persons), the Fund’s ordinary income dividends (which include distributions of net short-term capital gains) will generally be subject to a 30% U.S. federal withholding tax, unless a lower treaty rate applies provided that withholding tax will generally not apply to any gain or income realized by a non-U.S. shareholder in respect of any distributions of long-term capital gains or upon the sale or other disposition of shares of the Fund.

Separately, a 30% withholding tax is currently imposed on U.S.-source dividends, interest and other income items paid to (i) foreign financial institutions, including non-U.S. investment funds, unless they agree to collect and disclose to the U.S. Internal Revenue Service (“IRS”) information regarding their direct and indirect U.S. account holders and (ii) certain other foreign entities, unless they certify certain information regarding their direct and indirect U.S. owners. To avoid withholding, foreign financial institutions will need to (i) enter into agreements with the IRS that state that they will provide the IRS information, including the names, addresses and taxpayer identification numbers of direct and indirect U.S. account holders; comply with due diligence procedures with respect to the identification of U.S. accounts; report to the IRS certain information with respect to U.S. accounts maintained, agree to withhold tax on certain payments made to non-compliant foreign financial institutions or to account holders who fail to provide the required information; and determine certain other information concerning their account holders, or (ii) in the event that an applicable intergovernmental agreement and implementing legislation are adopted, provide local revenue authorities with similar account holder information. Other foreign entities may need to report the name, address, and taxpayer identification number of each substantial U.S. owner or provide certifications of no substantial U.S. ownership, unless certain exceptions apply.

Creations and Redemptions. Prior to trading in the secondary market, shares of the Fund are “created” at NAV by market makers, large investors and institutions only in

Table of Contents

block-size Creation Units or multiples thereof. Each “creator” or authorized participant (an “Authorized Participant”) has entered into an agreement with the Fund's distributor, BlackRock Investments, LLC (the “Distributor”), an affiliate of BFA. An Authorized Participant is a member or participant of a clearing agency registered with the SEC, which has a written agreement with the Fund or one of its service providers that allows such member or participant to place orders for the purchase and redemption of Creation Units.

Table of Contents

participants in a distribution in a manner that could render them statutory underwriters subject to the prospectus delivery and liability provisions of the 1933 Act. Any determination of whether one is an underwriter must take into account all the relevant facts and circumstances of each particular case.

Table of Contents

Distribution

Table of Contents

Financial Highlights

Financial Highlights
(For a share outstanding throughout each period)

	BlackRock Short Maturity Bond ETF
	Year Ended 10/31/21	Year Ended 10/31/20	Year Ended 10/31/19	Year Ended 10/31/18	Year Ended 10/31/17
Net asset value, beginning of year	$50.15	$50.36	$50.12	$50.25	$50.17
Net investment income^(a)	0.38	0.91	1.37	1.11	0.74
Net realized and unrealized gain (loss)^(b)	(0.03)	(0.16)	0.21	(0.23)	0.04
Net increase from investment operations	0.35	0.75	1.58	0.88	0.78
Distributions^(c)
From net investment income	(0.43)	(0.96)	(1.34)	(1.01)	(0.70)
Total distributions	(0.43)	(0.96)	(1.34)	(1.01)	(0.70)
Net asset value, end of year	$50.07	$50.15	$50.36	$50.12	$50.25
Total Return^(d)
Based on net asset value	0.70%	1.51%	3.19%	1.78%	1.57%
Ratios to Average Net Assets
Total expenses	0.25%	0.25%	0.25%	0.25%	0.25%
Total expenses after fees waived	0.25%	0.25%	0.25%	0.25%	0.25%
Net investment income	0.76%	1.81%	2.73%	2.21%	1.47%
Supplemental Data
Net assets, end of year (000)	$4,854,200	$4,397,750	$6,260,259	$4,981,818	$2,909,738
Portfolio turnover rate^(e)	55%	67%^(f)	58%^(f)	48%	56%
^(a) Based on average shares outstanding.
^(b) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.
^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.
^(d) Where applicable, assumes the reinvestment of distributions.
^(e) Portfolio turnover rate excludes in-kind transactions.
^(f) Includes mortgage dollar roll transactions (“MDRs”).

Table of Contents

Disclaimers

Shares of the Fund are not sponsored, endorsed or promoted by Cboe BZX. Cboe BZX makes no representation or warranty, express or implied, to the owners of the shares of the Fund or any member of the public regarding the ability of the Fund to achieve its investment objective. Cboe BZX is not responsible for, nor has it participated in, the determination of the Fund's investments, nor in the determination of the timing of, prices of, or quantities of shares of the Fund to be issued, nor in the determination or calculation of the equation by which the shares are redeemable. Cboe BZX has no obligation or liability to owners of the shares of the Fund in connection with the administration, marketing or trading of the shares of the Fund.

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

Want to know more?

iShares.com | 1-800-474-2737

If you have any questions about the Trust or shares of the Fund or you wish to obtain the SAI, Semi-Annual or Annual Report free of charge, please:

Call:	1-800-iShares or 1-800-474-2737 (toll free) Monday through Friday, 8:30 a.m. to 6:30 p.m. (Eastern time)
Email:	iSharesETFs@blackrock.com
Write:	c/o BlackRock Investments, LLC 1 University Square Drive, Princeton, NJ 08540

Investment Company Act File No.: 811-22649

IS-P-NEAR-0322

	March 1, 2022

2022 Prospectus

iShares U.S. ETF Trust

•	BlackRock Short Maturity Municipal Bond ETF \| MEAR \| CBOE BZX

Table of Contents

Fund Overview	S-1
More Information About the Fund	1
A Further Discussion of Principal Risks	3
A Further Discussion of Other Risks	15
Portfolio Holdings Information	16
Management	16
Shareholder Information	19
Distribution	27
Financial Highlights	28
Disclaimers	29

iShares^® and BlackRock^® are registered trademarks of BlackRock Fund Advisors and its affiliates.

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

BLACKROCK^® SHORT MATURITY
MUNICIPAL BOND ETF

Ticker: MEAR

Stock Exchange: Cboe BZX

Investment Objective

The BlackRock Short Maturity Municipal Bond ETF (the “Fund”) seeks to maximize tax-free current income.

Fees and Expenses

You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Annual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investments)
Management Fees	Distribution and Service (12b-1) Fees	Other Expenses¹	Total Annual Fund Operating Expenses
0.25%	None	0.00%	0.25%

¹ The amount rounded to 0.00%.

1 Year		3 Years		5 Years		10 Years
$26		$80		$141		$318

S-1

Table of Contents

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing, under normal circumstances, at least 80% of its net assets in municipal securities such that the interest on each bond is exempt from U.S. federal income taxes and the federal alternative minimum tax (“AMT”). Under normal circumstances, the Fund primarily invests in U.S. dollar-denominated, investment-grade short-term fixed- and floating-rate municipal securities with remaining maturities of five years or less, such as municipal bonds, municipal notes and variable rate demand obligations, as well as money market instruments and registered investment companies. Investment-grade securities are rated BBB- or higher by S&P Global Ratings and/or Fitch Ratings, Inc. (“Fitch”), or Baa3 or higher by Moody’s Investors Service, Inc. (“Moody's”), or, if unrated, determined by the Fund's management team to be of equivalent quality. Municipal bonds include debt obligations issued by or on behalf of a governmental entity or other qualifying issuer that pay interest that is, in the

opinion of bond counsel to the issuer at the time of issuance, generally excludable from gross income for U.S. federal income tax purposes. The Fund may invest up to 20% of its net assets in municipal securities that pay interest that is subject to the federal AMT. Issuers may be states, territories and possessions of the U.S., including the District of Columbia, and their political subdivisions, agencies and instrumentalities. BFA or its affiliates may advise the money market funds and investment companies in which the Fund may invest.

Under normal circumstances, the effective duration of the Fund's portfolio is expected to be 1.2 years or less, as calculated by the Fund's management team, and it is not expected to exceed 1.5 years. Effective duration is a measure of the Fund’s price sensitivity to changes in yields or interest rates; however, investors should be aware that effective duration is not an exact measurement and may not reliably predict a particular security’s price sensitivity to changes in yield or interest rates.

Under normal circumstances, the Fund will also seek to maintain a weighted average maturity that is less than three years. Weighted average maturity is a U.S. dollar-weighted average of the remaining term to maturity of the underlying securities in the Fund’s portfolio. The calculation of the Fund's weighted average maturity is based on the constituent securities' final maturity date or, for amortizing securities such as asset-backed and mortgage-backed securities, their weighted average life (i.e., the average length of time that each dollar of unpaid principal on the security remains outstanding).

The Fund is an actively managed

S-2

Table of Contents

exchange-traded fund (“ETF”) that does not seek to replicate the performance of a specified index. The Fund may have a higher degree of portfolio turnover than funds that seek to replicate the performance of an index.

Summary of Principal Risks

As with any investment, you could lose all or part of your investment in the Fund, and the Fund's performance could trail that of other investments. The Fund is subject to certain risks, including the principal risks noted below, any of which may adversely affect the Fund's net asset value per share (“NAV”), trading price, yield, total return and ability to meet its investment objective. Unlike many ETFs, the Fund is not an index-based ETF. The order of the below risk factors does not indicate the significance of any particular risk factor.

Asset Class Risk. Securities and other assets in the Fund's portfolio may underperform in comparison to the general financial markets, a particular financial market or other asset classes.

an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting.

S-3

Table of Contents

bid-ask spreads or greater premiums or discounts to the Fund’s NAV.

the cybersecurity plans and systems of the Fund’s service providers, market makers, Authorized Participants or issuers of securities in which the Fund invests.

Floating Rate Notes Risk. Securities with floating or variable interest rates can be less sensitive to interest rate changes than securities with fixed interest rates, but may decline in value if their coupon rates do not reset as high, or as quickly, as comparable market interest rates, and generally carry lower yields than fixed notes of the same maturity. Although floating rate notes are less sensitive to interest rate risk than fixed-rate securities, they are subject to credit risk and default risk, which could impair their value.

Income Risk. The Fund’s income may decline when interest rates fall because the Fund may hold a significant portion

S-4

Table of Contents

of short duration securities and/or securities that have floating or variable interest rates. The Fund’s income may decline because the Fund invests in lower yielding bonds, and as the bonds in its portfolio mature, are near maturity or are called, the Fund needs to purchase additional bonds.

or even negative yield. A low or negative yield would cause the Fund to lose money in certain conditions and over certain time periods. An increase in interest rates will generally cause the value of securities held by the Fund to decline, may lead to heightened volatility in the fixed-income markets and may adversely affect the liquidity of certain fixed-income investments, including those held by the Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. The historically low interest rate environment heightens the risks associated with rising interest rates.

S-5

Table of Contents

and may also adversely affect the ability of the Fund to achieve its investment objective.

Market Trading Risk. The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, periods of high volatility and disruptions in the creation/redemption process. Unlike some ETFs that track specific indexes, the Fund does not seek to replicate the performance of a specified index. Index-based ETFs have generally traded at prices that closely correspond to NAV. However, ETFs that do not seek to replicate the performance of a specified index have a limited trading history and, therefore, there can be no assurance as to whether, and/or the extent to which, the Fund's shares will trade at premiums or discounts to NAV. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

related to taxation, legislative changes or the rights of municipal security holders, including in connection with an issuer insolvency. Municipal securities backed by current or anticipated revenues from a specific project or specific assets can be negatively affected by the inability to collect revenues from such projects or assets. Certain municipal securities are issued by entities with limited taxing authority such as school districts, or are dependent on revenue from a particular sector or industry, such as the utilities sector, infrastructure sector, or transportation industry.

S-6

Table of Contents

Tax Risk. There is no guarantee that the Fund's income will be exempt from U.S. federal income taxes, the federal AMT or the federal Medicare contribution tax of 3.8% on “net investment income.”

trade suspensions or for other reasons. In addition, the value of the securities or other assets in the Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund's shares. Authorized Participants who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

S-7

Table of Contents

Performance Information

Year by Year Returns (Years Ended December 31)

The best calendar quarter return during the periods shown above was 0.89% in the 2nd quarter of 2020; the worst was -0.31% in the 1st quarter of 2020.

Updated performance information, including the Fund’s current NAV, may be obtained by visiting our website at www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).

S-8

Table of Contents

Average Annual Total Returns

(for the periods ended December 31, 2021)

	One Year	Five Years	Since Fund Inception
(Inception Date: 3/3/2015)
Return Before Taxes	0.06%	1.15%	0.98%
Return After Taxes on Distributions¹	0.06%	1.15%	0.98%
Return After Taxes on Distributions and Sale of Fund Shares¹	0.16%	1.12%	0.97%
Bloomberg Municipal Bond: 1 Year (1-2) Index² (Index returns do not reflect deductions for fees, expenses, or taxes)	0.31%	1.43%	1.15%

²	The Bloomberg Municipal Bond: 1 Year (1-2) Index is an unmanaged index comprised of national municipal bond issues having a maturity of at least one year and less than two years.

S-9

Table of Contents

Management

Investment Adviser. BlackRock Fund Advisors.

Portfolio Managers. Scott Radell, Kristi Manidis, James Mauro and Kevin A. Schiatta (the “Portfolio Managers”) are primarily responsible for the day-to-day management of the Fund. Each Portfolio Manager supervises a portfolio management team. Mr. Radell has been a Portfolio Manager of the Fund since 2015. Ms. Manidis and Mr. Schiatta have been Portfolio Managers of the Fund since 2019. Mr. Mauro has been a Portfolio Manager of the Fund since 2021.

Purchase and Sale of Fund Shares

Tax Information

The Fund intends to make distributions primarily from net tax-exempt income (but not necessarily free from federal AMT), although distributions of taxable capital gains may also occur. The Fund is generally not an appropriate investment for a 401(k) plan or an IRA. Please consult your personal tax advisor.

Payments to Broker-Dealers and Other Financial Intermediaries

S-10

Table of Contents

More Information About the Fund

Additional Information on the Investment Strategies. The Fund’s investment objective is a non-fundamental policy and may be changed without shareholder approval. The Fund seeks to achieve its investment objective by investing, under normal circumstances, at least 80% of its net assets in municipal securities such that the interest on each bond is exempt from U.S. federal income taxes and the federal AMT. The Fund’s 80% investment policy may be changed by the Fund’s Board of Trustees (the “Board”) upon 60 days’ notice to shareholders.

Under normal circumstances, the Fund primarily invests in U.S. dollar-denominated, investment-grade short-term fixed- and floating-rate municipal securities with remaining maturities of five years or less such as municipal bonds, municipal notes and variable rate demand obligations, as well as money market instruments and registered investment companies. Investment-grade securities are rated BBB- or higher by S&P Global Ratings and/or Fitch, or Baa3 or higher by Moody’s, or, if unrated, determined by the management team to be of equivalent quality. Municipal bonds include debt obligations issued by or on behalf of a governmental entity or other qualifying issuer that pay interest that is, in the opinion of bond counsel to the issuer at the time of issuance, generally excludable from gross income for U.S. federal income tax purposes. The Fund may invest up to 20% of its net assets in municipal securities that pay interest that is subject to the federal AMT. Issuers may be states, territories and possessions of the U.S., including the District of Columbia, and their political subdivisions, agencies and instrumentalities. BFA or its affiliates may advise the money market funds and investment companies in which the Fund may invest.

Under normal circumstances, the effective duration of the Fund’s portfolio is expected to be 1.2 years or less, as calculated by the management team, and it is not expected to exceed 1.5 years. Effective duration is a measure of the Fund’s price sensitivity to

Table of Contents

changes in yields or interest rates; however, investors should be aware that effective duration is not an exact measurement and may not reliably predict a particular security’s price sensitivity to changes in yield or interest rates.

The Fund may, to a limited extent, engage in derivatives transactions that include interest rate futures.

An investment in the Fund is not a bank deposit and it is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, BFA or any of its affiliates.

Investment Process. The management team evaluates portfolio construction, municipal security selection, and trade execution on an ongoing basis. The investment approach represents a collaboration between the Liquidity Portfolio Team and Municipal Credit Research Team. The Municipal Credit Research Team provides credit oversight and research and independently rates each security in the investment universe with a BlackRock equivalent rating. The Liquidity Portfolio Team uses these credit ratings in conjunction with the following factors to manage the portfolio:

■	Credit Quality of Issuers — based on bond ratings and other factors, including economic and financial conditions.
■	Yield Analysis — takes into account factors such as the different yields available on different types of obligations and the shape of the yield curve (longer-term obligations typically have higher yields).
■	Maturity Analysis — the weighted average maturity of the portfolio will be maintained within a desirable range as determined from time to time. Factors considered include portfolio activity, maturity of the supply of available bonds and the shape of the yield curve. Maturity of a debt security refers to the date upon which debt securities are due to be repaid, that is, the date when the issuer generally must pay back the face amount of the security. The securities to be selected will have remaining maturities of up to five years, calculated off the put dates.

The management team uses an internal model for calculating effective duration, which may result in a different value of effective duration than if it were calculated by a third party.

Table of Contents

A Further Discussion of Principal Risks

Asset Class Risk. The securities and other assets in the Fund’s portfolio may underperform in comparison to other securities or indexes that track other issuers, countries, groups of countries, regions, industries, groups of industries, markets, market segments, asset classes or sectors. Various types of securities may experience cycles of outperformance and underperformance in comparison to the general financial markets. This may cause the Fund to underperform other investment vehicles that invest in different asset classes.

Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund may “call” or repay the security before its stated maturity, and the Fund may have to reinvest the proceeds in securities with lower yields, which would result in a decline in the Fund’s income, or in securities with greater risks or with other less favorable features.

Cash Management Risk. To the extent the Fund holds cash, the Fund will earn reduced income (if any) on the cash and will be subject to the credit risk of the depository institution holding the cash and any fees imposed on large cash balances. If a significant amount of the Fund’s assets are invested in cash and cash equivalents, it will be more difficult for the Fund to achieve its investment objective. The Fund may underperform other funds that do not similarly invest in cash and cash equivalents for investment purposes and/or to collateralize derivative instruments.

Table of Contents

redemptions may also cause the Fund’s shares to trade in the market at greater bid-ask spreads or greater premiums or discounts to the Fund’s NAV. Furthermore, the Fund may not be able to execute cash transactions for creation and redemption purposes at the same price used to determine the Fund’s NAV. To the extent that the maximum additional charge for creation or redemption transactions is insufficient to cover the execution shortfall, the Fund’s performance could be negatively impacted.

Cybersecurity failures by, or breaches of, the systems of the Fund's adviser, distributor and other service providers (including, but not limited to, index and benchmark

Table of Contents

providers, fund accountants, custodians, transfer agents and administrators), market makers, Authorized Participants or the issuers of securities in which the Fund invests have the ability to cause disruptions and impact business operations, potentially resulting in: financial losses, interference with the Fund’s ability to calculate its NAV, disclosure of confidential trading information, impediments to trading, submission of erroneous trades or erroneous creation or redemption orders, the inability of the Fund or its service providers to transact business, violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, reimbursement or other compensation costs, or additional compliance costs. In addition, cyberattacks may render records of Fund assets and transactions, shareholder ownership of Fund shares, and other data integral to the functioning of the Fund inaccessible, inaccurate or incomplete. Substantial costs may be incurred by the Fund in order to resolve or prevent cyber incidents in the future. While the Fund has established business continuity plans in the event of, and risk management systems to prevent, such cyber incidents, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, that prevention and remediation efforts will not be successful or that cyberattacks will go undetected. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund, issuers in which the Fund invests, market makers or Authorized Participants. The Fund and its shareholders could be negatively impacted as a result.

Floating Rate Notes Risk. Compared to the broader U.S. Treasury note market, the issuance of floating rate obligations by the U.S. Treasury is relatively new. A deep and liquid market has not yet developed for these instruments, and the market remains relatively untested. Securities with floating or variable interest rates can be less sensitive to interest rate changes than securities with fixed interest rates, but may decline in value if their interest rates do not rise as much, or as quickly, as interest rates in general. Conversely, floating rate securities will not generally increase in value if interest rates decline. A decline in interest rates may result in a reduction in income received from floating rate securities held by the Fund and may adversely affect the value of the Fund’s shares. Generally, floating rate securities carry lower yields than fixed notes of the same maturity. The interest rate for a floating rate note resets or adjusts periodically by reference to a benchmark interest rate. The impact of interest rate changes on floating rate investments is typically mitigated by the periodic interest rate reset of the investments. Securities with longer durations tend to be more sensitive to interest rate changes, usually making them more volatile than securities with shorter durations. Floating rate notes generally are subject to legal or contractual restrictions on resale, may trade infrequently, and their value may be impaired when the Fund needs to liquidate such loans. Benchmark interest rates, such as the London Interbank Offered Rate or the Secured Overnight Financing Rate (SOFR), may not accurately track market interest rates.

Although floating rate notes are less sensitive to interest rate risk than fixed-rate securities, they are subject to credit risk and default risk, which could impair their value.

Illiquid Investments Risk. The Fund may invest up to an aggregate amount of 15% of its net assets in illiquid investments. An illiquid investment is any investment that the

Table of Contents

Fund reasonably expects cannot be sold or disposed of in current market conditions in seven calendar days or less without significantly changing the market value of the investment. To the extent the Fund holds illiquid investments, the illiquid investments may reduce the returns of the Fund because the Fund may be unable to transact at advantageous times or prices. An investment may be illiquid due to, among other things, the reduced number and capacity of traditional market participants to make a market in securities or instruments or the lack of an active market for such securities or instruments. To the extent that the Fund invests in securities or instruments with substantial market and/or credit risk, the Fund will tend to have increased exposure to the risks associated with illiquid investments. Liquid investments may become illiquid after purchase by the Fund, particularly during periods of market turmoil. There can be no assurance that a security or instrument that is deemed to be liquid when purchased will continue to be liquid for as long as it is held by the Fund, and any security or instrument held by the Fund may be deemed an illiquid investment pursuant to the Fund’s liquidity risk management program. Illiquid investments may be harder to value, especially in changing markets. If the Fund is forced to sell underlying investments at reduced prices or under unfavorable conditions to meet redemption requests or for other cash needs, the Fund may suffer a loss. This may be magnified in a rising interest rate environment or other circumstances where redemptions from the Fund may be greater than normal. Other market participants may be attempting to liquidate holdings at the same time as the Fund, causing increased supply of the Fund’s underlying investments in the market and contributing to illiquid investments risk and downward pricing pressure. During periods of market volatility, liquidity in the market for the Fund’s shares may be impacted by the liquidity in the market for the underlying securities or instruments held by the Fund, which could lead to the Fund’s shares trading at a premium or discount to the Fund's NAV.

■

Table of Contents

	layoffs, defaults and other significant economic impacts, as well as general concern and uncertainty.
■	Market Volatility. The outbreak has also resulted in extreme volatility, severe losses, and disruptions in markets which can adversely impact the Fund and its investments, including impairing hedging activity to the extent the Fund engages in such activity, as expected correlations between related markets or instruments may no longer apply. In addition, to the extent the Fund invests in short-term instruments that have negative yields, the Fund’s value may be impaired as a result. Certain issuers of equity securities have cancelled or announced the suspension of dividends. The outbreak has, and may continue to, negatively affect the credit ratings of some fixed-income securities and their issuers.
■	Market Closures. Certain local markets have been or may be subject to closures, and there can be no assurance that trading will continue in any local markets in which the Fund may invest, when any resumption of trading will occur or, once such markets resume trading, whether they will face further closures. Any suspension of trading in markets in which the Fund invests will have an impact on the Fund and its investments and will impact the Fund’s ability to purchase or sell securities in such markets.
■	Operational Risk. The outbreak could also impair the information technology and other operational systems upon which the Fund’s service providers, including BFA, rely, and could otherwise disrupt the ability of employees of the Fund's service providers to perform critical tasks relating to the Fund, for example, due to the service providers’ employees performing tasks in alternate locations than under normal operating conditions or the illness of certain employees of the Fund's service providers.
■	Governmental Interventions. Governmental and quasi-governmental authorities and regulators throughout the world have responded to the outbreak and the resulting economic disruptions with a variety of fiscal and monetary policy changes, including direct capital infusions into companies and other issuers, new monetary policy tools, and lower interest rates. An unexpected or sudden reversal of these policies, or the ineffectiveness of such policies, is likely to increase market volatility, which could adversely affect the Fund’s investments.
■	Pre-Existing Conditions. Public health crises caused by the outbreak may exacerbate other pre-existing political, social and economic risks in certain countries or globally, which could adversely affect the Fund and its investments and could result in increased premiums or discounts to the Fund's NAV.

Other infectious illness outbreaks that may arise in the future could have similar or other unforeseen effects.

Table of Contents

longer duration, rising interest rates may cause the value of the Fund's investments to decline significantly, which would adversely affect the value of the Fund. An increase in interest rates may lead to heightened volatility in the fixed-income markets and adversely affect certain fixed-income investments, including those held by the Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. In addition, decreases in fixed income dealer market-making capacity may lead to lower trading volume, heightened volatility, wider bid-ask spreads and less transparent pricing in certain fixed-income markets.

Issuer Risk. Fund performance depends on the performance of individual securities to which the Fund has exposure. The Fund may be adversely affected if an issuer of underlying securities held by the Fund is unable or unwilling to repay principal or interest when due. Changes to the financial condition or credit rating of an issuer of those securities may cause the value of the securities to decline. An issuer may also be subject to risks associated with the countries, states and regions in which the issuer resides, invests, sells products, or otherwise conducts operations.

Table of Contents

Market Risk. The Fund could lose money over short periods due to short-term market movements and over longer periods during more prolonged market downturns. Market risk arises mainly from uncertainty about future values of financial instruments and may be influenced by price, currency and interest rate movements. It represents the potential loss the Fund may suffer through holding financial instruments in the face of market movements or uncertainty. The value of a security or other asset may decline due to changes in general market conditions, economic trends or events that are not specifically related to the issuer of the security or other asset, or factors that affect a particular issuer or issuers, country, group of countries, region, market, industry, group of industries, sector or asset class. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund and its investments and could result in increased premiums or discounts to the Fund’s NAV. During a general market downturn, multiple asset classes may be negatively affected. Fixed-income securities with short-term maturities are generally less sensitive to such changes than are fixed-income securities with longer-term maturities. Changes in market conditions and interest rates generally do not have the same impact on all types of securities and instruments.

Market Trading Risk.

Table of Contents

extraordinary market volatility pursuant to “circuit breaker” rules on the stock exchange or market.

Table of Contents

advisable for investors who anticipate regularly making small investments through a brokerage account.

Municipal securities can be significantly affected by political or economic changes, including changes made in the law after issuance of the securities, as well as uncertainties in the municipal market related to taxation, legislative changes or the rights of municipal security holders, including in connection with an issuer insolvency. There is also the risk that corruption may negatively affect municipal issuers, including corruption related to a particular project from which payments on a security are derived, resulting in delays and cost overruns.

Table of Contents

and developments affecting a particular project can result in lower revenues to an issuer of the municipal securities and, by extension, adversely affect payments of principal and interest on, or the market value of, such securities.

Additionally, certain municipal securities are issued by entities dependent on revenue from a particular sector and thus are subject to the specific risks associated with that sector.

Table of Contents

adversely affected by political and economic changes at the state or federal levels, such as decreased tax or other revenues, spending reductions or changes in appropriations. Municipal securities that are issued to finance a particular school district project often depend on revenues from ad valorem taxes (i.e., property taxes) to make principal and interest payments. Investors in these securities, similar to investors in municipal securities generally, face heightened risk of loss upon insolvency of the school district issuers because there is often no ready source of funding to pay principal and interest other than the local tax base, which a bankruptcy court or administrator does not control.

Risk of Investing in Transportation Infrastructure-Related Municipal Securities. The transportation infrastructure industry may be adversely affected by economic changes, increases in fuel and other operating costs, labor relations, insurance costs, and, in many jurisdictions, the effects of regulatory changes or other government decisions. Municipal securities that are issued to finance a particular transportation project (e.g., toll roads) often depend on revenues from that project to make principal and interest payments.

Operational Risk. The Fund is exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund's service providers, counterparties or other third parties, failed or inadequate processes and technology or systems failures. The Fund and BFA seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

Table of Contents

adopted policy and legislative changes in the U.S. are changing many aspects of financial, commercial, public health, environmental, and other regulation and may have a significant effect on U.S. markets generally, as well as on the value of certain securities. Governmental agencies project that the U.S. will continue to maintain elevated public debt levels for the foreseeable future. Although elevated debt levels do not necessarily indicate or cause economic problems, elevated public debt service costs may constrain future economic growth.

Tax Risk. There is no guarantee that the Fund’s income will be exempt from U.S. federal income taxes, the federal AMT or the federal Medicare contribution tax of 3.8% on “net investment income.” BFA relies on the bond issuer’s prospectus disclosure of the opinion from its counsel as to the tax-exempt status of the investment. Neither BFA nor the Fund guarantees that this opinion is correct, and there is no assurance that the U.S. Internal Revenue Service (“IRS”) will agree with the bond issuer’s counsel’s tax opinion. Issuers or other parties generally enter into covenants requiring continuing compliance with U.S. federal tax requirements to preserve the tax-free status of interest payments over the life of the security. If at any time the covenants are not complied with, or if the IRS otherwise determines that the issuer did not comply with relevant tax requirements, interest payments from a security could become federally taxable, possibly retroactively to the date the security was issued, and the security could decline significantly in value. BFA will generally seek to obtain bonds that pay interest that is exempt from U.S. federal income taxes, the federal AMT and the federal Medicare contribution tax. The interest on any money market instruments or other cash equivalents held by the Fund may be subject to the federal AMT or the federal Medicare contribution tax.

Events occurring after the date of issuance of a municipal bond or after the Fund’s acquisition of a municipal bond may result in a determination that interest on that bond is includible in gross income for U.S. federal income tax, federal AMT or federal Medicare contribution tax purposes retroactively to its date of issuance. Such a determination may cause a portion of prior distributions by the Fund to its shareholders to be taxable to those shareholders in the year of receipt. U.S. federal or state changes in income, federal AMT or federal Medicare contribution tax rates or in the tax treatment of municipal bonds may make municipal bonds less attractive as investments and cause them to lose value. If the IRS determines an issuer of a municipal security has not complied with applicable tax requirements, interest from the security could become taxable, even retroactively, and the securities could decline significantly in value.

Valuation Risk. The price the Fund could receive upon the sale of a security or other asset may differ from the Fund's valuation of the security or other asset, particularly

Table of Contents

for securities or other assets that trade in low volume or volatile markets or that are valued using a fair value methodology as a result of trade suspensions or for other reasons. Because non-U.S. exchanges may be open on days when the Fund does not price its shares, the value of the securities or other assets in the Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund’s shares. Authorized Participants who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

A Further Discussion of Other Risks

Privately Issued Securities Risk. The Fund may invest in privately issued securities, including those that are normally purchased pursuant to Rule 144A or Regulation S under the Securities Act of 1933, as amended (the “1933 Act”). Privately issued securities typically may be resold only to qualified institutional buyers, or in a privately negotiated transaction, or to a limited number of purchasers, or in limited quantities after they have been held for a specified period of time and other conditions are met for an exemption from registration. Because there may be relatively few potential purchasers for such securities, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer, the Fund may find it more difficult to sell such securities when it may be advisable to do so or it may be able to sell such securities only at prices lower than if such securities were more widely held and traded. At times, it also may be more difficult to determine the fair value of such securities for purposes of computing the Fund’s NAV due to the absence of an active trading market. There can be no assurance that a privately issued security that is deemed to be liquid when purchased will continue to be liquid for as long as it is held by the Fund, and its value may decline as a result.

Threshold/Underinvestment Risk. If certain aggregate and/or fund-level ownership thresholds are reached through transactions undertaken by BFA, its affiliates or the

Table of Contents

Fund, or as a result of third-party transactions or actions by an issuer or regulator, the ability of BFA and its affiliates on behalf of clients (including the Fund) to purchase or dispose of investments, or exercise rights or undertake business transactions, may be restricted by regulation or otherwise impaired. The capacity of the Fund to make investments in certain securities may be affected by the relevant threshold limits, and such limitations may have adverse effects on the liquidity and performance of the Fund’s portfolio holdings.

Portfolio Holdings Information

Management

Investment Adviser. As investment adviser, BFA has overall responsibility for the general management and administration of the Fund. BFA provides an investment program for the Fund and manages the investment of the Fund’s assets. In managing the Fund, BFA may draw upon the trading, research and expertise of its asset management affiliates for portfolio decisions and management with respect to portfolio securities. In seeking to achieve the Fund's investment objective, BFA uses teams of portfolio managers, investment strategists and other investment specialists. This team approach brings together many disciplines and leverages BFA’s extensive resources.

For its investment advisory services to the Fund, BFA is paid a management fee from the Fund based on a percentage of the Fund’s average daily net assets, at the annual rate of 0.25%. BFA may from time to time voluntarily waive and/or reimburse fees or expenses in order to limit total annual fund operating expenses (excluding acquired

Table of Contents

fund fees and expenses, if any). Any such voluntary waiver or reimbursement may be eliminated by BFA at any time.

BFA is located at 400 Howard Street, San Francisco, CA 94105. It is an indirect wholly owned subsidiary of BlackRock, Inc. (“BlackRock”). As of December 31, 2021, BFA and its affiliates provided investment advisory services for assets in excess of $10.01 trillion. BFA and its affiliates trade and invest for their own accounts in the types of securities in which the Fund may also invest.

A discussion regarding the basis for the approval by the Board of the Investment Advisory Agreement with BFA is available in the Fund's Annual Report for the period ended October 31.

Portfolio Managers. Kristi Manidis, James Mauro, Scott Radell and Kevin A. Schiatta are primarily responsible for the day-to-day management of the Fund. Each Portfolio Manager is responsible for various functions related to portfolio management, including, but not limited to, developing and implementing the Fund’s investment process and investment strategy, researching and reviewing investment strategy and overseeing members of his portfolio management team that have more limited responsibilities.

Kristi Manidis has been with BlackRock since 2004. Ms. Manidis has been employed by BlackRock as a portfolio manager since 2009 and has been a Portfolio Manager of the Fund since 2019.

Kevin A. Schiatta, CFA has been with BlackRock since 2006, following its merger with Merrill Lynch Investment Management. Mr. Schiatta has been employed by BlackRock as a portfolio manager since 2006 and has been a Portfolio Manager of the Fund since 2019.

Table of Contents

Administrator, Custodian and Transfer Agent. State Street Bank and Trust Company (“State Street”) is the administrator, custodian and transfer agent for the Fund.

Table of Contents

sustain losses during periods in which one or more Affiliates and other accounts achieve profits on their trading for proprietary or other accounts. The opposite result is also possible.

The Fund's activities may be limited because of regulatory restrictions applicable to BFA or one or more Affiliates and/or their internal policies designed to comply with such restrictions.

Shareholder Information

Table of Contents

bid price and the ask price. The spread varies over time for shares of the Fund based on the Fund’s trading volume and market liquidity, and is generally lower if the Fund has high trading volume and market liquidity, and higher if the Fund has little trading volume and market liquidity (which is often the case for funds that are newly launched or small in size). The Fund's spread may also be impacted by the liquidity or illiquidity of the underlying securities held by the Fund, particularly for newly launched or smaller funds or in instances of significant volatility of the underlying securities.

The Board has adopted a policy of not monitoring for frequent purchases and redemptions of Fund shares (“frequent trading”) that appear to attempt to take advantage of a potential arbitrage opportunity presented by a lag between a change in the value of the Fund’s portfolio securities after the close of the primary markets for the Fund’s portfolio securities and the reflection of that change in the Fund’s NAV (“market timing”), because the Fund sells and redeems its shares directly through transactions that are in-kind and/or for cash, subject to the conditions described below under Creations and Redemptions. The Board has not adopted a policy of monitoring for other frequent trading activity because shares of the Fund are listed for trading on a national securities exchange.

Section 12(d)(1) of the 1940 Act generally restricts investments by investment companies, including foreign and unregistered investment companies, in the securities of other investment companies. For example, a registered investment company (the “Acquired Fund”), such as the Fund, may not knowingly sell or otherwise dispose of any security issued by the Acquired Fund to any investment company (the “Acquiring Fund”) or any company or companies controlled by the Acquiring Fund if, immediately after such sale or disposition: (i) more than 3% of the total outstanding voting stock of the Acquired Fund is owned by the Acquiring Fund and any company or companies controlled by the Acquiring Fund or (ii) more than 10% of the total outstanding voting stock of the Acquired Fund is owned by the Acquiring Fund and other investment companies and companies controlled by them. Although SEC rules may permit registered investment companies and unit investment trusts (“Investing Funds”) that enter into an investment agreement with the Trust to invest in iShares funds beyond the limits set forth in Section 12(d)(1) of the 1940 Act subject to certain terms and conditions, the Fund does not permit such investments. Accordingly, Investing Funds must adhere to the limits set forth in Section 12(d)(1) of the 1940 Act when investing in the Fund. In addition, foreign investment companies are permitted to invest in the Fund only up to the limits set forth in Section 12(d)(1), subject to any applicable SEC no-action relief.

Table of Contents

Share Prices. The trading prices of the Fund’s shares in the secondary market generally differ from the Fund’s daily NAV and are affected by market forces such as the supply of and demand for ETF shares and underlying securities held by the Fund, economic conditions and other factors.

The value of the securities and other assets and liabilities held by the Fund is determined pursuant to valuation policies and procedures approved by the Board.

Generally, trading in non-U.S. securities and money market instruments is substantially completed each day at various times prior to the close of regular trading hours of the NYSE. The values of such securities used in computing the NAV of the Fund are determined as of such times.

Table of Contents

Dividends and Distributions

General Policies. Dividends from net investment income, if any, generally are declared and paid at least once a year by the Fund. Distributions of net realized securities gains, if any, generally are declared and paid once a year, but the Trust may make distributions on a more frequent basis for the Fund. The Trust reserves the right to declare special distributions if, in its reasonable discretion, such action is necessary or advisable to preserve its status as a regulated investment company or to avoid imposition of income or excise taxes on undistributed income or realized gains.

Taxes. As with any investment, you should consider how your investment in shares of the Fund will be taxed. The tax information in this Prospectus is provided as general information, based on current law. There is no guarantee that shares of the Fund will receive certain regulatory or accounting treatment. You should consult your own tax professional about the tax consequences of an investment in shares of the Fund.

Table of Contents

Unless your investment in Fund shares is made through a tax-exempt entity or tax-deferred retirement account, such as an IRA, in which case your distributions generally will be taxable when withdrawn, you need to be aware of the possible tax consequences when the Fund makes distributions or you sell Fund shares. In general, given its investment strategy, the Fund would not be an appropriate investment for a tax deferred retirement account such as an IRA.

Taxes on Distributions.

Dividends paid by the Fund that are properly reported as tax-exempt interest dividends will not be subject to regular U.S. federal income tax. The Fund intends to invest its assets in a manner such that dividend distributions to its shareholders will generally be exempt from U.S. federal income taxation, including the federal AMT. Dividends paid by the Fund will be exempt from U.S. federal income tax (though not necessarily exempt from state and local taxation) to the extent of the Fund’s tax-exempt interest income as long as 50% or more of the value of the Fund’s assets at the end of each quarter is invested in state, municipal and other bonds that are excluded from gross income for U.S. federal income tax purposes and as long as the Fund properly reports such dividends as tax-exempt interest dividends. Exempt interest dividends from interest earned on municipal securities of a state, or its political subdivisions, may be exempt from income tax in that state. However, income from municipal securities of other states generally will not qualify for tax-free treatment.

Distributions from the Fund’s net investment income other than from net tax-exempt income, including distributions out of the Fund’s net short-term capital gains, if any, are taxable to you as ordinary income. The Fund's distributions of net long-term capital gains, if any, in excess of net short-term capital losses (capital gain dividends) are taxable to you as long-term capital gains, regardless of how long you have held the Fund’s shares. Long-term capital gains are eligible for taxation at a maximum rate of 15% or 20% for non-corporate shareholders, depending on whether their income exceeds certain threshold amounts. Taxable distributions from the Fund are subject to a 3.8% U.S. federal Medicare contribution tax on “net investment income,” for individuals with incomes exceeding $200,000 ($250,000 if married and filing jointly) and of estates and trusts. Distributions from the Fund are not expected to qualify as qualified dividend income. In general, any taxable distributions are subject to U.S. federal income tax for the year when they are paid. Certain distributions paid in January, however, may be treated as paid on December 31 of the prior year.

Any market discount recognized on a bond is taxable as ordinary income. A market discount bond is a bond acquired in the secondary market at a price below redemption value or adjusted issue price if issued with original issue discount. To the extent the Fund does not include the market discount in income as it accrues, gain on the Fund's disposition of such an obligation will be treated as ordinary income rather than capital gain to the extent of the accrued market discount.

If you lend your Fund shares pursuant to securities lending arrangements, you may lose the ability to treat Fund dividends (paid while the shares are held by the borrower) as tax-exempt income. Consult your financial intermediary or tax advisor.

If you are neither a resident nor a citizen of the U.S. or if you are a non-U.S. entity (other than a pass-through entity to the extent owned by U.S. persons), the Fund’s

Table of Contents

ordinary income dividends (which include distributions of net short-term capital gains) will generally be subject to a 30% U.S. federal withholding tax, unless a lower treaty rate applies provided that withholding tax will generally not apply to any gain or income realized by a non-U.S. shareholder in respect of any distributions of long-term capital gains or upon the sale or other disposition of shares of the Fund.

Separately, a 30% withholding tax is currently imposed on U.S.-source dividends, interest and other income items paid to (i) foreign financial institutions, including non-U.S. investment funds, unless they agree to collect and disclose to the IRS information regarding their direct and indirect U.S. account holders and (ii) certain other foreign entities, unless they certify certain information regarding their direct and indirect U.S. owners. To avoid withholding, foreign financial institutions will need to (i) enter into agreements with the IRS that state that they will provide the IRS information, including the names, addresses and taxpayer identification numbers of direct and indirect U.S. account holders; comply with due diligence procedures with respect to the identification of U.S. accounts; report to the IRS certain information with respect to U.S. accounts maintained; agree to withhold tax on certain payments made to non-compliant foreign financial institutions or to account holders who fail to provide the required information; and determine certain other information as to their account holders, or (ii) in the event that an applicable intergovernmental agreement and implementing legislation are adopted, provide local revenue authorities with similar account holder information. Other foreign entities may need to report the name, address, and taxpayer identification number of each substantial U.S. owner or provide certifications of no substantial U.S. ownership, unless certain exceptions apply.

Shareholders will receive information after the end of each year setting forth the amount of dividends and long-term capital gains distributed to them by the Fund during the prior year. Likewise, the amount of tax-exempt income, including any tax-exempt income subject to federal AMT, that the Fund distributes will be reported and such income must be reported on the shareholder’s U.S. federal income tax return. The AMT is a separate tax system that operates in parallel to the regular federal income tax system but eliminates many deductions and exclusions. The AMT has different tax rates and treats as taxable certain types of income that are nontaxable for regular income tax purposes. The interest on certain “private activity” municipal bonds is taxable income for AMT purposes. If a taxpayer’s overall AMT liability is higher than regular income tax liability, then the taxpayer owes the regular income tax liability plus the difference between the AMT liability and the regular income tax liability.

Table of Contents

capital gain dividends, are included in “net investment income” for purposes of the 3.8% U.S. federal Medicare contribution tax mentioned above.

If your shares are lent out pursuant to a securities lending arrangement, you may lose any ability to use the non-U.S. tax credits passed through by the Fund.

Table of Contents

term is defined in Rule 144A under the 1933 Act, will not be able to receive restricted securities eligible for resale under Rule 144A.

Table of Contents

Distribution

Table of Contents

Financial Highlights

Financial Highlights
(For a share outstanding throughout each period)

	BlackRock Short Maturity Municipal Bond ETF
	Year Ended 10/31/21	Year Ended 10/31/20	Year Ended 10/31/19	Year Ended 10/31/18	Year Ended 10/31/17
Net asset value, beginning of year	$50.19	$50.13	$49.85	$50.01	$50.02
Net investment income^(a)	0.17	0.51	0.81	0.68	0.49
Net realized and unrealized gain (loss)^(b)	(0.07)	0.13	0.26	(0.21)	(0.03)
Net increase from investment operations	0.10	0.64	1.07	0.47	0.46
Distributions^(c)
From net investment income	(0.18)	(0.58)	(0.79)	(0.63)	(0.47)
Total distributions	(0.18)	(0.58)	(0.79)	(0.63)	(0.47)
Net asset value, end of year	$50.11	$50.19	$50.13	$49.85	$50.01
Total Return^(d)
Based on net asset value	0.19%	1.29%	2.16%	0.95%	0.93%
Ratios to Average Net Assets
Total expenses	0.25%	0.25%	0.25%	0.25%	0.25%
Total expenses after fees waived	0.25%	0.25%	0.25%	0.25%	0.25%
Net investment income	0.34%	1.02%	1.63%	1.35%	0.99%
Supplemental Data
Net assets, end of year (000)	$293,169	$291,091	$210,532	$127,111	$52,507
Portfolio turnover rate^(e)	52%	108%	170%	221%	163%
^(a) Based on average shares outstanding.
^(b) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.
^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.
^(d) Where applicable, assumes the reinvestment of distributions.
^(e) Portfolio turnover rate excludes in-kind transactions.

Table of Contents

Disclaimers

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

Want to know more?

iShares.com | 1-800-474-2737

If you have any questions about the Trust or shares of the Fund or you wish to obtain the SAI, Semi-Annual or Annual Report free of charge, please:

Call:	1-800-iShares or 1-800-474-2737 (toll free) Monday through Friday, 8:30 a.m. to 6:30 p.m. (Eastern time)
Email:	iSharesETFs@blackrock.com
Write:	c/o BlackRock Investments, LLC 1 University Square Drive, Princeton, NJ 08540

Investment Company Act File No.: 811-22649

IS-P-MEAR-0322

	March 1, 2022

2022 Prospectus

iShares U.S. ETF Trust

•	BlackRock Ultra Short-Term Bond ETF \| ICSH \| CBOE BZX

Table of Contents

Fund Overview	S-1
More Information About the Fund	1
A Further Discussion of Principal Risks	2
A Further Discussion of Other Risks	17
Portfolio Holdings Information	22
Management	22
Shareholder Information	26
Distribution	34
Financial Highlights	35
Disclaimers	36

iShares^® and BlackRock^® are registered trademarks of BlackRock Fund Advisors and its affiliates.

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

BLACKROCK^® ULTRA SHORT-TERM BOND ETF

Ticker: ICSH

Stock Exchange: Cboe BZX

Investment Objective

The BlackRock Ultra Short-Term Bond ETF (the “Fund”) seeks to provide current income consistent with preservation of capital.

Fees and Expenses

You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Annual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investments)
Management Fees	Distribution and Service (12b-1) Fees	Other Expenses¹	Total Annual Fund Operating Expenses
0.08%	None	0.00%	0.08%

¹ The amount rounded to 0.00%.

1 Year		3 Years		5 Years		10 Years
$8		$26		$45		$103

S-1

Table of Contents

Portfolio Turnover.The Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 47% of the average value of its portfolio.

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing, under normal circumstances, at least 80% of its net assets in a portfolio of U.S. dollar-denominated investment-grade fixed- and floating-rate debt securities that are rated BBB- or higher by S&P Global Ratings and/or Fitch Ratings, Inc. (“Fitch”), or Baa3 or higher by Moody’s Investors Service, Inc. (“Moody’s”), or, if unrated, determined by the Fund's management team to be of equivalent quality. Under normal circumstances, the Fund will invest primarily in fixed- and floating-rate securities maturing in three years or less. Short-term investments (generally, securities with original maturities of one year or less) held by the Fund carry a rating in one of the highest two rating categories of at least one nationally recognized statistical ratings organization (“NRSRO”) (e.g., A-2, P-2 or F2 or better by S&P Global Ratings, Moody’s or Fitch, respectively), or if such investments are unrated, are determined to be of comparable quality by the Fund's management team, at the

time of investment.

The Fund may invest in corporate and U.S. and non-U.S. government bonds, agency securities, instruments of non-U.S. issuers, privately issued securities, asset-backed securities (“ABS”) and mortgage-backed securities (“MBS”), structured securities, municipal bonds, repurchase agreements, money market instruments and investment companies (including investment companies advised by BFA or its affiliates). The Fund invests a significant portion of its assets in securities issued by financial institutions, such as banks, broker-dealers and insurance companies.

Under normal circumstances, the dollar-weighted average life of the Fund’s portfolio is expected to be one year or less, as calculated by the Fund's management team. The Fund will also seek to maintain a dollar-weighted average maturity that is less than 180 days. “Dollar-weighted average life,” or “WAL,” is the weighted average of the times when principal is to be repaid. “Dollar-weighted average maturity,” or “WAM,” is calculated by taking the average length of time to maturity (fixed-rate) or the next interest rate reset (floating-rate) for each underlying instrument held by the Fund, weighted according to the relative holdings per instrument.

The Fund is not a money market fund and does not seek to maintain a stable net asset value of $1.00 per share. Please see the Fund's Statement of

S-2

Table of Contents

Additional Information (“SAI”) for further information.

The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of the collateral received).

Summary of Principal Risks

As with any investment, you could lose all or part of your investment in the Fund, and the Fund's performance could trail that of other investments. The Fund is subject to certain risks, including the principal risks noted below, any of which may adversely affect the Fund's net asset value per share (“NAV”), trading price, yield, total return and ability to meet its investment objective. Unlike many ETFs, the Fund is not an index-based ETF. The order of the below risk factors does not indicate the significance of any particular risk factor.

Asset Class Risk. Securities and other assets in the Fund's portfolio may underperform in comparison to the general financial markets, a particular financial market or other asset classes.

S-3

Table of Contents

bid-ask spreads or greater premiums or discounts to the Fund’s NAV.

the cybersecurity plans and systems of the Fund’s service providers, market makers, Authorized Participants or issuers of securities in which the Fund invests.

Floating Rate Notes Risk. Securities with floating or variable interest rates can be less sensitive to interest rate changes than securities with fixed interest rates, but may decline in value if their coupon rates do not reset as high, or as quickly, as comparable market interest rates, and generally carry lower yields than fixed notes of the same maturity. Although floating rate notes are less sensitive to interest rate risk than fixed-rate securities, they are subject to credit risk and default risk, which could impair their value.

Illiquid Investments Risk. The Fund may invest up to an aggregate amount of 15% of its net assets in illiquid investments. An illiquid investment is

S-4

Table of Contents

any investment that the Fund reasonably expects cannot be sold or disposed of in current market conditions in seven calendar days or less without significantly changing the market value of the investment. To the extent the Fund holds illiquid investments, the illiquid investments may reduce the returns of the Fund because the Fund may be unable to transact at advantageous times or prices. During periods of market volatility, liquidity in the market for the Fund’s shares may be impacted by the liquidity in the market for the underlying securities or instruments held by the Fund, which could lead to the Fund’s shares trading at a premium or discount to the Fund’s NAV.

securities or cause elevated tracking error and increased premiums or discounts to the Fund's NAV. Other infectious illness outbreaks in the future may result in similar impacts.

S-5

Table of Contents

creation/redemption process. Unlike some ETFs that track specific indexes, the Fund does not seek to replicate the performance of a specified index. Index-based ETFs have generally traded at prices that closely correspond to NAV. However, ETFs that do not seek to replicate the performance of a specified index have a limited trading history and, therefore, there can be no assurance as to whether, and/or the extent to which, the Fund's shares will trade at premiums or discounts to NAV. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

S-6

Table of Contents

S-7

Table of Contents

or a decline in the value of any investments made with cash collateral. These events could also trigger adverse tax consequences for the Fund.

S-8

Table of Contents

Performance Information

Year by Year Returns (Years Ended December 31)

The best calendar quarter return during the periods shown above was 1.62% in the 2nd quarter of 2020; the worst was -0.34% in the 1st quarter of 2020.

Updated performance information, including the Fund’s current NAV, may be obtained by visiting our website at www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).

S-9

Table of Contents

Average Annual Total Returns

(for the periods ended December 31, 2021)

	One Year	Five Years	Since Fund Inception
(Inception Date: 12/11/2013)
Return Before Taxes	0.16%	1.75%	1.31%
Return After Taxes on Distributions¹	-0.01%	1.09%	0.80%
Return After Taxes on Distributions and Sale of Fund Shares¹	0.10%	1.05%	0.78%
ICE BofA 6-Month US Treasury Bill Index^2,3 (Index returns do not reflect deductions for fees, expenses or taxes)	0.09%	1.31%	0.94%

²	The ICE BofA 6-Month US Treasury Bill Index is an unmanaged index that measures the performance of government securities with less than six months remaining to maturity.
³	Index returns through February 28, 2021 reflect the 3pm pricing variant of the ICE BofA 6-Month US Treasury Bill Index. Index returns beginning on March 1, 2021 reflect the performance of the 4pm pricing variant of the ICE BofA 6-Month US Treasury Bill Index.

S-10

Table of Contents

Management

Investment Adviser and Sub-Adviser. The Fund's investment adviser is BFA. The Fund’s sub-adviser is BlackRock International Limited (“BIL” or the “Sub-Adviser”).

Portfolio Managers. James Mauro, Richard Mejzak and Scott Radell (the “Portfolio Managers”) are primarily responsible for the day-to-day management of the Fund. Each Portfolio Manager supervises a portfolio management team. Mr. Mauro has been a Portfolio Manager of the Fund since 2021. Mr. Mejzak and Mr. Radell have been Portfolio Managers of the Fund since 2013.

Purchase and Sale of Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

S-11

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

More Information About the Fund

The Fund’s investment objective is a non-fundamental policy and may be changed without shareholder approval.

Additional Information on the Investment Strategies. The Fund seeks to achieve its investment objective by investing, under normal circumstances, at least 80% of its net assets in a portfolio of U.S. dollar-denominated investment-grade fixed- and floating-rate debt securities that are rated BBB- or higher by S&P Global Ratings and/or Fitch, or Baa3 or higher by Moody’s, or, if unrated, determined by the Fund’s management team to be of equivalent quality. Under normal circumstances, the Fund invests in fixed- and floating-rate securities maturing in three years or less. Short-term investments (generally, securities with original maturities of one year or less) held by the Fund carry a rating in one of the highest two rating categories of at least one NRSRO (e.g., A-2, P-2 or F2 or better by S&P Global Ratings, Moody’s or Fitch, respectively), or if such investments are unrated, are determined to be of comparable quality by BFA, at the time of investment. The Fund’s 80% investment policy may be changed by the Fund’s Board of Trustees (the “Board”) upon 60 days’ notice to shareholders.

The Fund may invest in corporate and U.S. and non-U.S. government bonds, agency
securities, instruments of non-U.S. issuers, privately issued securities, ABS and MBS, structured securities, municipal bonds, repurchase agreements, money market instruments and investment companies. The Fund invests a significant portion of its assets in securities issued by financial institutions, such as banks, broker-dealers and insurance companies. BFA or its affiliates may advise the money market funds and investment companies in which the Fund may invest.

The Fund may invest in ABS and MBS. ABS are fixed-income securities that are backed by a pool of assets, usually loans such as installment sale contracts or credit card

Table of Contents

receivables. MBS are ABS based on a particular type of asset, a mortgage. There are a wide variety of MBS involving commercial or residential, fixed-rate or adjustable-rate mortgages and mortgages issued by banks or government agencies. Most transactions in fixed-rate mortgage pass-through securities occur through standardized contracts for future delivery in which the exact mortgage pools to be delivered are not specified until a few days prior to settlement, known as TBA transactions. The Fund may enter into such contracts on a regular basis. The Fund, pending settlement of such contracts, will invest the relevant assets in high-quality, liquid short-term instruments, including shares of money market funds affiliated with BFA. Collateralized mortgage obligations (“CMOs”) are fixed-income securities that are backed by cash flows from pools of mortgages. CMOs may have multiple classes with different payment rights and protections.

The Fund may, to a limited extent, engage in derivatives transactions that include futures contracts, options and swaps.

Investment Process. The cash portfolio management team participates in formal
investment strategy meetings where investment professionals present their views on the various market sectors, asset allocation, portfolio risk, and other investment themes. The macro, firm-level view is a consideration in setting the investment strategy.

Decisions regarding interest rate risk, credit quality, liquidity profile and sector allocation are made by the Investment Strategy and Risk Committees. These committees build on the broader macro themes and apply them specifically to the short-term markets. The meetings are supplemented by shorter daily market updates where portfolio managers report on their specific sectors to determine relative value within the short term markets. This is a fluid process with intraday dialogue to make adjustments to portfolios when appropriate.

The collective result of these meetings is the investment strategy that liquidity portfolio managers subsequently implement. Using this method, the group is able to manage portfolios on a team basis but still leverage the individual expertise of each of its members throughout the firm.

In certain situations or market conditions, the Fund may temporarily depart from its normal investment process, provided that such departure is, in the opinion of BFA, consistent with the Fund’s investment objective and in the best interests of the Fund. For example, the Fund may hold a higher than normal proportion of its assets in cash in response to adverse market, economic or political conditions.

The management team uses an internal model for calculating duration, which may result in a different value of duration than if duration was calculated by a third party.

An investment in the Fund is not a bank deposit and it is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, BFA or any of its affiliates.

A Further Discussion of Principal Risks

The Fund is subject to various risks, including the principal risks noted below, any of which may adversely affect the Fund’s NAV, trading price, yield, total return and ability

Table of Contents

to meet its investment objective. You could lose all or part of your investment in the Fund, and the Fund could underperform other investments. The order of the below risk factors does not indicate the significance of any particular risk factor.

Asset Class Risk. The securities and other assets in the Fund’s portfolio may underperform in comparison to other securities or indexes that track other issuers, countries, groups of countries, regions, industries, groups of industries, markets, market segments, asset classes or sectors. Various types of securities may experience cycles of outperformance and underperformance in comparison to the general financial markets depending upon a number of factors including, among other things, inflation, interest rates, productivity, global demand for local products or resources, and regulation and governmental controls. This may cause the Fund to underperform other investment vehicles that invest in different asset classes.

Authorized Participant Concentration Risk. Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem Creation Units, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting. Authorized Participant concentration risk may be heightened because ETFs, such as the Fund, that invest in securities issued by non-U.S. issuers or other securities or instruments that are less widely traded often involve greater settlement and operational issues and capital costs for Authorized Participants, which may limit the availability of Authorized Participants.

Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund may “call” or repay the security before its stated maturity, and the Fund may have to reinvest the proceeds in securities with lower yields, which would result in a decline in the Fund’s income, or in securities with greater risks or with other less favorable features.

Cash Management Risk. To the extent the Fund holds cash, the Fund will earn reduced income (if any) on the cash and will be subject to the credit risk of the depository institution holding the cash and any fees imposed on large cash balances. If a significant amount of the Fund’s assets are invested in cash and cash equivalents, it will be more difficult for the Fund to achieve its investment objective. The Fund may underperform other funds that do not similarly invest in cash and cash equivalents for investment purposes and/or to collateralize derivative instruments.

Table of Contents

gains distributions than ETFs that redeem in-kind. The use of cash creations and redemptions may also cause the Fund’s shares to trade in the market at greater bid-ask spreads or greater premiums or discounts to the Fund’s NAV. Furthermore, the Fund may not be able to execute cash transactions for creation and redemption purposes at the same price used to determine the Fund’s NAV. To the extent that the maximum additional charge for creation or redemption transactions is insufficient to cover the execution shortfall, the Fund’s performance could be negatively impacted.

Cybersecurity failures by, or breaches of, the systems of the Fund's adviser, distributor

Table of Contents

and other service providers (including, but not limited to, index and benchmark providers, fund accountants, custodians, transfer agents and administrators), market makers, Authorized Participants or the issuers of securities in which the Fund invests have the ability to cause disruptions and impact business operations, potentially resulting in: financial losses, interference with the Fund’s ability to calculate its NAV, disclosure of confidential trading information, impediments to trading, submission of erroneous trades or erroneous creation or redemption orders, the inability of the Fund or its service providers to transact business, violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, reimbursement or other compensation costs, or additional compliance costs. In addition, cyberattacks may render records of Fund assets and transactions, shareholder ownership of Fund shares, and other data integral to the functioning of the Fund inaccessible, inaccurate or incomplete. Substantial costs may be incurred by the Fund in order to resolve or prevent cyber incidents in the future. While the Fund has established business continuity plans in the event of, and risk management systems to prevent, such cyber incidents, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, that prevention and remediation efforts will not be successful or that cyberattacks will go undetected. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund, issuers in which the Fund invests, market makers or Authorized Participants. The Fund and its shareholders could be negatively impacted as a result.

Table of Contents

effects in the markets and the financials sector generally. Companies in the financials sector may also be adversely affected by increases in interest rates and loan losses, decreases in the availability of money or asset valuations, credit rating downgrades and adverse conditions in other related markets. Insurance companies, in particular, may be subject to severe price competition and/or rate regulation, which may have an adverse impact on their profitability. The financials sector is particularly sensitive to fluctuations in interest rates. The financials sector is also a target for cyberattacks, and may experience technology malfunctions and disruptions. In recent years, cyberattacks and technology malfunctions and failures have become increasingly frequent in this sector and have reportedly caused losses to companies in this sector, which may negatively impact the Fund.

Floating Rate Notes Risk. Securities with floating or variable interest rates can be less sensitive to interest rate changes than securities with fixed interest rates, but may decline in value if their interest rates do not rise as much, or as quickly, as interest rates in general. Conversely, floating rate securities will not generally increase in value if interest rates decline. A decline in interest rates may result in a reduction in income received from floating rate securities held by the Fund and may adversely affect the value of the Fund’s shares. Generally, floating rate securities carry lower yields than fixed notes of the same maturity. The interest rate for a floating rate note resets or adjusts periodically by reference to a benchmark interest rate. The impact of interest rate changes on floating rate investments is typically mitigated by the periodic interest rate reset of the investments. Securities with longer durations tend to be more sensitive to interest rate changes, usually making them more volatile than securities with shorter durations. Floating rate notes generally are subject to legal or contractual restrictions on resale, may trade infrequently, and their value may be impaired when the Fund needs to liquidate such loans. Benchmark interest rates, such as the London Interbank Offered Rate (“LIBOR”) or the Secured Overnight Financing Rate (“SOFR”), may not accurately track market interest rates.

Although floating rate notes are less sensitive to interest rate risk than fixed-rate securities, they are subject to credit risk and default risk, which could impair their value.

Table of Contents

will continue to be liquid for as long as it is held by the Fund, and any security or instrument held by the Fund may be deemed an illiquid investment pursuant to the Fund’s liquidity risk management program. Illiquid investments may be harder to value, especially in changing markets. If the Fund is forced to sell underlying investments at reduced prices or under unfavorable conditions to meet redemption requests or for other cash needs, the Fund may suffer a loss. This may be magnified in a rising interest rate environment or other circumstances where redemptions from the Fund may be greater than normal. Other market participants may be attempting to liquidate holdings at the same time as the Fund, causing increased supply of the Fund’s underlying investments in the market and contributing to illiquid investments risk and downward pricing pressure. During periods of market volatility, liquidity in the market for the Fund’s shares may be impacted by the liquidity in the market for the underlying securities or instruments held by the Fund, which could lead to the Fund’s shares trading at a premium or discount to the Fund's NAV.

■	General Impact. This outbreak has resulted in travel restrictions, closed international borders, enhanced health screenings at ports of entry and elsewhere, disruption of, and delays in, healthcare service preparation and delivery, prolonged quarantines, cancellations, supply chain disruptions, lower consumer demand, temporary and permanent closures of stores, restaurants and other commercial establishments, layoffs, defaults and other significant economic impacts, as well as general concern and uncertainty.
■	Market Volatility. The outbreak has also resulted in extreme volatility, severe losses, and disruptions in markets which can adversely impact the Fund and its investments, including impairing hedging activity to the extent the Fund engages in such activity, as expected correlations between related markets or instruments may no longer apply. In addition, to the extent the Fund invests in short-term instruments that have negative yields, the Fund’s value may be impaired as a result. Certain issuers of equity securities have cancelled or announced the suspension of dividends. The outbreak has, and may continue to, negatively affect the credit ratings of some fixed-income securities and their issuers.
■	Market Closures. Certain local markets have been or may be subject to closures,

Table of Contents

and there can be no assurance that trading will continue in any local markets in which the Fund may invest, when any resumption of trading will occur or, once such markets resume trading, whether they will face further closures. Any suspension of trading in markets in which the Fund invests will have an impact on the Fund and its investments and will impact the Fund’s ability to purchase or sell securities in such markets.

■	Operational Risk. The outbreak could also impair the information technology and other operational systems upon which the Fund’s service providers, including BFA, rely, and could otherwise disrupt the ability of employees of the Fund's service providers to perform critical tasks relating to the Fund, for example, due to the service providers’ employees performing tasks in alternate locations than under normal operating conditions or the illness of certain employees of the Fund's service providers.
■	Governmental Interventions. Governmental and quasi-governmental authorities and regulators throughout the world have responded to the outbreak and the resulting economic disruptions with a variety of fiscal and monetary policy changes, including direct capital infusions into companies and other issuers, new monetary policy tools, and lower interest rates. An unexpected or sudden reversal of these policies, or the ineffectiveness of such policies, is likely to increase market volatility, which could adversely affect the Fund’s investments.
■	Pre-Existing Conditions. Public health crises caused by the outbreak may exacerbate other pre-existing political, social and economic risks in certain countries or globally, which could adversely affect the Fund and its investments and could result in increased premiums or discounts to the Fund's NAV.

Other infectious illness outbreaks that may arise in the future could have similar or other unforeseen effects.

The historically low interest rate environment was created in part by the world’s major central banks keeping their overnight policy interest rates at, near or below zero

Table of Contents

percent and implementing monetary policy facilities, such as asset purchase programs, to anchor longer-term interest rates below historical levels. During periods of very low or negative interest rates, the Fund may be unable to maintain positive returns or pay dividends to Fund shareholders. Certain countries have recently experienced negative interest rates on certain fixed-income instruments. Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, result in heightened market volatility and detract from the Fund’s performance to the extent the Fund is exposed to such interest rates. Additionally, under certain market conditions in which interest rates are set at low levels and the market prices of portfolio securities have increased, the Fund may have a very low or even negative yield. A low or negative yield would cause the Fund to lose money in certain conditions and over certain time periods. Central banks may increase their short-term policy rates or begin phasing out, or “tapering,” accommodative monetary policy facilities in the future. The timing, coordination, magnitude and effect of such policy changes on various markets are uncertain, and such changes in monetary policy may adversely affect the value of the Fund’s investments.

Table of Contents

particular issuer or issuers, country, group of countries, region, market, industry, group of industries, sector or asset class. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund and its investments and could result in increased premiums or discounts to the Fund’s NAV. During a general market downturn, multiple asset classes may be negatively affected. Fixed-income securities with short-term maturities are generally less sensitive to such changes than are fixed-income securities with longer-term maturities. Changes in market conditions and interest rates generally do not have the same impact on all types of securities and instruments.

Market Trading Risk.

Table of Contents

value of such securities. Additionally, certain municipal securities may be issued by entities with limited taxing authority, which could limit or prevent tax increases necessary to make continued payments of principal and interest.

Additionally, certain municipal securities are issued by entities dependent on revenue from a particular sector and thus are subject to the specific risks associated with that sector.

Table of Contents

of the school district issuers because there is often no ready source of funding to pay principal and interest other than the local tax base, which a bankruptcy court or administrator does not control.

Table of Contents

risk, interest rate risk, valuation risk and other risks relevant to the Fund’s investments. The Fund does not seek to maintain a stable net asset value of $1.00 per share.

Operational Risk. The Fund is exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund's service providers, counterparties or other third parties, failed or inadequate processes and technology or systems failures. The Fund and BFA seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

Table of Contents

some geographic areas in which the Fund invests have experienced strained international relations due to territorial disputes, historical animosities, defense concerns and other security concerns. These situations may cause uncertainty in the financial markets in these countries or geographic areas and may adversely affect the performance of the issuers to which the Fund has exposure. Heavy regulation of certain markets, including labor and product markets, may have an adverse effect on certain issuers. Such regulations may negatively affect economic growth or cause prolonged periods of recession. Many developed countries are heavily indebted and face rising healthcare and retirement expenses. In addition, price fluctuations of certain commodities and regulations impacting the import of commodities may negatively affect developed country economies.

Table of Contents

on days when the Fund is holding fair-valued securities may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the Fund not fair-valued securities or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

A Further Discussion of Other Risks

Asian Economic Risk. Many Asian economies have experienced rapid growth and industrialization in recent years, but there is no assurance that this growth rate will be maintained. Other Asian economies, however, have experienced high inflation, high unemployment, currency devaluations and restrictions, and over-extension of credit. Geopolitical hostility, political instability, and economic or environmental events in any one Asian country may have a significant economic effect on the entire Asian region, as well as on major trading partners outside Asia. Any adverse event in the Asian markets may have a significant adverse effect on some or all of the economies of the countries in which the Fund invests. In particular, China is a key trading partner of many Asian countries and any changes in trading relationships between China and other Asian countries may affect the region as a whole. Many Asian countries are subject to political risk, including political instability, corruption and regional conflict with neighboring countries. North Korea and South Korea each have substantial military capabilities, and historical tensions between the two countries present the risk of war. Escalated tensions involving the two countries and any outbreak of hostilities between the two countries, or even the threat of an outbreak of hostilities, could have a severe adverse effect on the entire Asian region. Certain Asian countries have developed increasingly strained relationships with the U.S. or with China, and if these relations were to worsen, they could adversely affect Asian issuers that rely on the U.S. or China for trade. In addition, many Asian countries are subject to social and labor risks associated with demands for improved political, economic and social conditions. These risks, among others, may adversely affect the value of the Fund's investments.

Consumer Cyclical Industry Risk. The success of consumer cyclical companies is tied closely to the performance of domestic and international economies, exchange

Table of Contents

rates, interest rates, competition, consumer confidence, changes in demographics and preferences. Companies in the consumer cyclical industry depend heavily on disposable household income and consumer spending, and may be strongly affected by social trends and marketing campaigns. These companies may be subject to severe competition, which may have an adverse impact on their profitability.

Energy Sector Risk. The success of companies in the energy sector may be cyclical and highly dependent on energy prices. The market value of securities issued by companies in the energy sector may decline for the following reasons, among others: changes in the levels and volatility of global energy prices, energy supply and demand, and capital expenditures on exploration and production of energy sources; exchange rates, interest rates, economic conditions, and tax treatment; and energy conservation efforts, increased competition and technological advances. Companies in this sector may be subject to substantial government regulation and contractual fixed pricing, which may increase the cost of doing business and limit the earnings of these companies. A significant portion of the revenues of these companies may depend on a relatively small number of customers, including governmental entities and utilities. As a result, governmental budget constraints may have a material adverse effect on the stock prices of companies in this sector. Energy companies may also operate in, or engage in transactions involving, countries with less developed regulatory regimes or a history of expropriation, nationalization or other adverse policies. Energy companies also face a significant risk of liability from accidents resulting in injury or loss of life or property, pollution or other environmental problems, equipment malfunctions or mishandling of materials and a risk of loss from terrorism, cyber incident, political strife or natural disasters. Any such event could have serious consequences for the general population of the affected area and could have an adverse impact on the Fund’s portfolio and the performance of the Fund. Energy companies can be significantly affected by the supply of, and demand for, specific products (e.g., oil and natural gas) and services, exploration and production spending, government subsidization, world events and general economic conditions. In the context of the COVID-19 outbreak and disputes among oil-producing countries regarding potential limits on the production of crude oil, the energy sector has recently experienced increased volatility. In particular, significant market volatility in the crude oil markets as well as the oil futures markets resulted in the market price of the front month WTI crude oil futures contracts falling below zero for a period of time. Energy companies may have relatively high levels of debt and may be more likely than other companies to restructure their businesses if there are downturns in energy markets or in the global economy.

Table of Contents

to be a period of significant political, regulatory and commercial uncertainty as the U.K. continues to negotiate the terms of its future trading relationships.

LIBOR Replacement Risk. As part of the phase-out of the use of LIBOR, the rate’s administrator, ICE Benchmark Administration Limited (“IBA”), discontinued two USD LIBOR settings immediately after publication on December 31, 2021. The United Kingdom’s Financial Conduct Authority (“FCA”), which regulates LIBOR, and IBA previously announced that a majority of USD LIBOR settings will no longer be published after June 30, 2023. While the FCA is requiring the IBA to publish certain LIBOR settings, potentially to include USD settings, on a “synthetic” basis, the “synthetic” methodology is not based on panel bank contributions and is not intended to be representative of the interest rates in the underlying market. The Fund may have investments linked to other interbank offered rates, such as the Euro Overnight Index Average (“EONIA”), which may also cease to be published. Various financial industry groups continue planning for the transition away from LIBOR, but there are challenges to converting certain securities and transactions to a new reference rate, such as SOFR, which is intended to replace USD LIBOR. For example, at times, SOFR has proven to be more volatile than the 3-month USD LIBOR. Working groups and regulators in other countries have suggested other alternatives for their markets, including the Sterling Overnight Interbank Average Rate (“SONIA”) in England.

Table of Contents

alternative rate-setting provisions in certain existing instruments. Global regulators have advised market participants to cease entering into new contracts using LIBOR as a reference rate, and it is possible that investments in LIBOR-based instruments could invite regulatory scrutiny. In addition, a liquid market for newly issued instruments that use a reference rate other than LIBOR still may be developing. There may also be challenges for the Fund to enter into hedging transactions against such newly issued instruments until a market for such hedging transactions develops. All of the aforementioned may adversely affect the Fund’s performance or NAV.

Threshold/Underinvestment Risk. If certain aggregate and/or fund-level ownership thresholds are reached through transactions undertaken by BFA, its affiliates or the Fund, or as a result of third-party transactions or actions by an issuer or regulator, the ability of BFA and its affiliates on behalf of clients (including the Fund) to purchase or dispose of investments, or exercise rights or undertake business transactions, may be restricted by regulation or otherwise impaired. The capacity of the Fund to make investments in certain securities may be affected by the relevant threshold limits, and such limitations may have adverse effects on the liquidity and performance of the Fund’s portfolio holdings.

Table of Contents

movement of interest rates. Deregulation may subject utility companies to greater competition and may adversely affect their profitability. As deregulation allows utility companies to diversify outside of their original geographic regions and their traditional lines of business, utility companies may engage in riskier ventures. In addition, deregulation may eliminate restrictions on the profits of certain utility companies, but may also subject these companies to greater risk of loss. Companies in the utilities industry may have difficulty obtaining an adequate return on invested capital, raising capital, or financing large construction projects during periods of inflation or unsettled capital markets; face restrictions on operations and increased cost and delays attributable to environmental considerations and regulation; find that existing plants, equipment or products have been rendered obsolete by technological innovations; or be subject to increased costs because of the scarcity of certain fuels or the effects of man-made or natural disasters. Existing and future regulations or legislation may make it difficult for utility companies to operate profitably. Government regulators monitor and control utility revenues and costs, and therefore may limit utility profits. In certain countries, regulatory authorities may also restrict utility companies’ access to new markets, thereby diminishing these companies’ long-term prospects. There is no assurance that regulatory authorities will grant rate increases in the future or that such increases will be adequate to permit the payment of coupon payments on bonds issued by such company . Energy conservation and changes in climate policy may also have a significant adverse impact on the revenues and expenses of utility companies.

Portfolio Holdings Information

Management

Investment Adviser. As investment adviser, BFA has overall responsibility for the general management and administration of the Fund. BFA provides an investment program for the Fund and manages the investment of the Fund’s assets. In managing the Fund, BFA may draw upon the trading, research and expertise of its asset management affiliates for portfolio decisions and management with respect to portfolio securities. In seeking to achieve the Fund's investment objective, BFA uses teams of portfolio managers, investment strategists and other investment specialists. This team approach brings together many disciplines and leverages BFA’s extensive resources.

Table of Contents

and litigation expenses and extraordinary expenses (as determined by a majority of the Trustees who are not “interested persons” of the Trust).

For its investment advisory services to the Fund, BFA is paid a management fee from the Fund based on a percentage of the Fund's average daily net assets, at the annual rate of 0.08%. BFA may from time to time voluntarily waive and/or reimburse fees or expenses in order to limit total annual fund operating expenses (excluding acquired fund fees and expenses, if any). Any such voluntary waiver or reimbursement may be eliminated by BFA at any time.

BFA has entered into a sub-advisory agreement with the Sub-Adviser, an affiliate of BFA, under which BFA pays the Sub-Adviser for services it provides either: (i) a fee equal to a percentage of the management fee paid to BFA under the Investment Advisory Agreement or (ii) an amount based on the cost of the services provided. The Sub-Adviser, subject to the supervision and oversight of the Trust's Board of Trustees (the “Board”) and BFA, is primarily responsible for the execution of securities transactions outside the U.S. and Canada and may, from time to time, participate in the management of specified assets in the Fund’s portfolio. If the Sub-Adviser provides services relating to both portfolio management and trading, it is entitled to receive from BFA an amount equal to 20% of BFA’s management fee, and if the Sub-Adviser provides services related solely to trading, then it is entitled to receive from BFA an amount equal to 110% of the actual pre-tax costs incurred by the Sub-Adviser.

BFA is located at 400 Howard Street, San Francisco, CA 94105. It is an indirect wholly-owned subsidiary of BlackRock, Inc. (“BlackRock”). As of December 31, 2021, BFA and its affiliates provided investment advisory services for assets in excess of $10.01 trillion. BIL is an investment adviser located in the U.K. at Exchange Place One, 1 Semple Street, Edinburgh EH3 8BL, Scotland 011 44 131 472 7200. The Sub-Adviser is a registered investment adviser and a commodity pool operator organized in 1999. BFA, the Sub-Adviser, and their affiliates trade and invest for their own accounts in the actual securities and types of securities in which the Fund may also invest, which may affect the price of such securities.

A discussion regarding the basis for the approval by the Board of the Investment Advisory Agreement with BFA is available in the Fund's Annual Report for the period ended October 31. A discussion regarding the basis for the approval by the Board of the Sub-Advisory Agreement between BFA and BIL is available in the Fund’s Annual Report for the period ended October 31, 2021.

Table of Contents

Portfolio Managers. James Mauro, Richard Mejzak and Scott Radell are primarily responsible for the day-to-day management of the Fund. Each Portfolio Manager is responsible for various functions related to portfolio management, including, but not limited to, developing and implementing the Fund’s investment process and investment strategy, researching and reviewing investment strategy and overseeing members of his portfolio management team that have more limited responsibilities.

Table of Contents

transactions with, companies for which an Affiliate provides or may in the future provide research coverage. An Affiliate may have business relationships with, and purchase or distribute or sell services or products from or to, distributors, consultants or others who recommend the Fund or who engage in transactions with or for the Fund, and may receive compensation for such services. The Fund may also invest in sovereign issuers that are advised by an Affiliate with respect to their debt offerings. BFA or one or more Affiliates may engage in proprietary trading and advise accounts and funds that have investment objectives similar to those of the Fund and/or that engage in and compete for transactions in the same types of securities, currencies and other instruments as the Fund. This may include transactions in securities issued by other open-end and closed-end investment companies (which may include investment companies that are affiliated with the Fund and BFA, to the extent permitted under the Investment Company Act of 1940, as amended (the “1940 Act”)). The trading activities of BFA and these Affiliates are carried out without reference to positions held directly or indirectly by the Fund and may result in BFA or an Affiliate having positions in certain securities that are senior or junior to, or have interests different from or adverse to, the securities that are owned by the Fund.

The Fund's activities may be limited because of regulatory restrictions applicable to BFA or one or more Affiliates and/or their internal policies designed to comply with such restrictions.

Table of Contents

liquidity, and (in some cases) expense ratio of the Fund may be impacted by purchases and sales of the Fund by BlackRock and/or its advisory clients.

Shareholder Information

Buying or selling Fund shares on an exchange or other secondary market involves two types of costs that may apply to all securities transactions. When buying or selling shares of the Fund through a broker, you may incur a brokerage commission and other charges. The commission is frequently a fixed amount and may be a significant proportional cost for investors seeking to buy or sell small amounts of shares. In addition, you may incur the cost of the “spread,” that is, any difference between the bid price and the ask price. The spread varies over time for shares of the Fund based on the Fund’s trading volume and market liquidity, and is generally lower if the Fund has high trading volume and market liquidity, and higher if the Fund has little trading volume and market liquidity (which is often the case for funds that are newly launched or small in size). The Fund's spread may also be impacted by the liquidity or illiquidity of the underlying securities held by the Fund, particularly for newly launched or smaller funds or in instances of significant volatility of the underlying securities.

The Board has adopted a policy of not monitoring for frequent purchases and redemptions of Fund shares (“frequent trading”) that appear to attempt to take advantage of a potential arbitrage opportunity presented by a lag between a change in the value of the Fund’s portfolio securities after the close of the primary markets for the Fund’s portfolio securities and the reflection of that change in the Fund’s NAV (“market timing”), because the Fund sells and redeems its shares directly through transactions that are in-kind and/or for cash, subject to the conditions described below under Creations and Redemptions. The Board has not adopted a policy of

Table of Contents

monitoring for other frequent trading activity because shares of the Fund are listed for trading on a national securities exchange.

Share Prices. The trading prices of the Fund’s shares in the secondary market generally differ from the Fund’s daily NAV and are affected by market forces such as the supply of and demand for ETF shares and underlying securities held by the Fund, economic conditions and other factors.

Table of Contents

The value of the securities and other assets and liabilities held by the Fund is determined pursuant to valuation policies and procedures approved by the Board.

Generally, trading in non-U.S. securities and money market instruments is substantially completed each day at various times prior to the close of regular trading hours of the NYSE. The values of such securities used in computing the NAV of the Fund are determined as of such times.

Table of Contents

using fair value pricing will result in prices that may differ from current market valuations and that may not be the prices at which those investments could have been sold during the period in which the particular fair values were used.

Dividends and Distributions

General Policies. Dividends from net investment income, if any, generally are declared and paid at least once a year by the Fund. Distributions of net realized securities gains, if any, generally are declared and paid once a year, but the Trust may make distributions on a more frequent basis for the Fund. The Trust reserves the right to declare special distributions if, in its reasonable discretion, such action is necessary or advisable to preserve its status as a regulated investment company or to avoid imposition of income or excise taxes on undistributed income or realized gains.

Taxes. As with any investment, you should consider how your investment in shares of the Fund will be taxed. The tax information in this Prospectus is provided as general information, based on current law. There is no guarantee that shares of the Fund will receive certain regulatory or accounting treatment. You should consult your own tax professional about the tax consequences of an investment in shares of the Fund.

Table of Contents

year when they are paid. Certain distributions paid in January, however, may be treated as paid on December 31 of the prior year.

You may lose the ability to use foreign tax credits passed through by the Fund if your Fund shares are loaned out pursuant to a securities lending agreement.

If you are neither a resident nor a citizen of the U.S. or if you are a non-U.S. entity (other than a pass-through entity to the extent owned by U.S. persons), the Fund’s ordinary income dividends (which include distributions of net short-term capital gains) will generally be subject to a 30% U.S. federal withholding tax, unless a lower treaty rate applies provided that withholding tax will generally not apply to any gain or income realized by a non-U.S. shareholder in respect of any distributions of long-term capital gains or upon the sale or other disposition of shares of the Fund.

Table of Contents

identification numbers of direct and indirect U.S. account holders; comply with due diligence procedures with respect to the identification of U.S. accounts; report to the IRS certain information with respect to U.S. accounts maintained, agree to withhold tax on certain payments made to non-compliant foreign financial institutions or to account holders who fail to provide the required information; and determine certain other information concerning their account holders, or (ii) in the event that an applicable intergovernmental agreement and implementing legislation are adopted, provide local revenue authorities with similar account holder information. Other foreign entities may need to report the name, address, and taxpayer identification number of each substantial U.S. owner or provide certifications of no substantial U.S. ownership, unless certain exceptions apply.

Table of Contents

may accept “custom baskets.” More information regarding custom baskets is contained in the Fund's SAI.

Householding. Householding is an option available to certain Fund investors. Householding is a method of delivery, based on the preference of the individual

Table of Contents

investor, in which a single copy of certain shareholder documents can be delivered to investors who share the same address, even if their accounts are registered under different names. Please contact your broker-dealer if you are interested in enrolling in householding and receiving a single copy of prospectuses and other shareholder documents, or if you are currently enrolled in householding and wish to change your householding status.

Table of Contents

Distribution

Table of Contents

Financial Highlights

Financial Highlights
(For a share outstanding throughout each period)

	BlackRock Ultra Short-Term Bond ETF
	Year Ended 10/31/21	Year Ended 10/31/20	Year Ended 10/31/19	Year Ended 10/31/18	Year Ended 10/31/17
Net asset value, beginning of year	$50.54	$50.41	$50.15	$50.12	$50.04
Net investment income^(a)	0.22	0.69	1.38	1.16	0.71
Net realized and unrealized gain (loss)^(b)	(0.07)	0.25	0.23	(0.16)	0.02
Net increase from investment operations	0.15	0.94	1.61	1.00	0.73
Distributions^(c)
From net investment income	(0.24)	(0.81)	(1.35)	(0.97)	(0.65)
Total distributions	(0.24)	(0.81)	(1.35)	(0.97)	(0.65)
Net asset value, end of year	$50.45	$50.54	$50.41	$50.15	$50.12
Total Return^(d)
Based on net asset value	0.29%	1.89%	3.25%	2.02%	1.47%
Ratios to Average Net Assets
Total expenses	0.08%	0.08%	0.08%	0.08%	0.09%
Net investment income	0.44%	1.36%	2.74%	2.33%	1.43%
Supplemental Data
Net assets, end of year (000)	$5,806,662	$4,922,726	$2,195,391	$601,794	$187,932
Portfolio turnover rate^(e)	47%	54%	16%	32%	11%
^(a) Based on average shares outstanding.
^(b) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.
^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.
^(d) Where applicable, assumes the reinvestment of distributions.
^(e) Portfolio turnover rate excludes in-kind transactions.

Table of Contents

Disclaimers

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

[THIS PAGE INTENTIONALLY LEFT BLANK]

Table of Contents

Want to know more?

iShares.com | 1-800-474-2737

If you have any questions about the Trust or shares of the Fund or you wish to obtain the SAI, Semi-Annual or Annual Report free of charge, please:

Call:	1-800-iShares or 1-800-474-2737 (toll free) Monday through Friday, 8:30 a.m. to 6:30 p.m. (Eastern time)
Email:	iSharesETFs@blackrock.com
Write:	c/o BlackRock Investments, LLC 1 University Square Drive, Princeton, NJ 08540

Investment Company Act File No.: 811-22649

IS-P-ICSH-0322

The Trust (also referred to in this section as the “Fund”) is organized as a Delaware statutory trust and is operated pursuant to an Agreement and Declaration of Trust (the “Declaration of Trust”) that permits the Trust to indemnify its trustees and officers under certain circumstances. Such indemnification, however, is subject to the limitations imposed by the Securities Act of 1933, as amended (the “1933 Act”), and the Investment Company Act of 1940, as amended (the “1940 Act”).

The Declaration of Trust provides that every person who is, or has been, a trustee or officer of the Trust (a “Covered Person”) shall be indemnified by the Trust or the applicable Fund to the fullest extent permitted by law against liability and against all expenses reasonably incurred or paid in connection with any claim, action, suit, proceeding in which he or she becomes involved as a party or otherwise by virtue of being or having been a trustee or officer and against amounts paid as incurred in the settlement thereof.

(i) who shall have been adjudicated by a court or body before which the proceeding was brought (A) to be liable to the Trust or its shareholders by reason of willful misfeasance, bad faith, gross negligence, or reckless disregard of the duties involved in the conduct of his office or (B) not to have acted in good faith in the reasonable belief that his action was in the best interest of the Trust; or

(ii) in the event of a settlement, unless there has been a determination that such trustee or officer did not engage in willful misfeasance, bad faith, gross negligence, or reckless disregard of the duties involved in the conduct of his office: (A) by the court or other body approving the settlement; (B) by at least a majority of those trustees who neither are “interested persons” (as defined in the 1940 Act) of the Trust nor are parties to the matter based upon a review of readily-available facts (as opposed to a full trial-type inquiry); or (C) by written opinion of independent legal counsel based upon a review of readily-available facts (as opposed to a full trial-type inquiry).

The By-Laws provides that the Trust may purchase and maintain insurance on behalf of any Covered Person or employee of the Trust, including any Covered Person or employee of the Trust who is or was serving at the request of the Trust as a trustee, officer, or employee of a corporation, partnership, association, joint venture, trust, or other enterprise, against any liability asserted against and incurred by such Covered Person or employee in any such capacity or arising out of his or her status as such, whether or not the trustees would have the power to indemnify him or her against such liability. The Trust may not acquire or obtain a contract for insurance that protects or purports to protect any trustee or officer of the Trust against any liability to the Trust or its Shareholders to which such trustee or officer otherwise would be subject by reason of willful misfeasance, bad faith, gross negligence, or reckless disregard of the duties involved in the conduct of his or her office.

Insofar as indemnification for liabilities arising under the 1933 Act may be permitted to directors, officers and controlling persons of the Fund pursuant to the foregoing provisions, or otherwise, the Fund has been advised that in the opinion of the SEC such indemnification is against public policy as expressed in the 1933 Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Fund of expenses incurred or paid by a director, officer or controlling person of the Fund in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the Fund will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the 1933 Act and will be governed by the final adjudication of such issue.

Section 17 of the Master Services Agreement between Registrant and State Street:

The Master Services Agreement provides that State Street will indemnify, defend and hold harmless the applicable Fund, its Affiliates, and its respective officers, directors, employees, agents and permitted successors and assigns from any and all damages, fines, penalties, deficiencies, losses, liabilities (including judgments and amounts reasonably paid in settlement) and expenses (including interest, court costs, reasonable fees and expenses of attorneys, accountants and other experts or other reasonable fees and expenses of litigation or other proceedings or of any claim, default or assessment) (“Losses”) arising from or in connection with any third party claim or threatened third party claim to the extent that such Losses are based on or arising out of any of the following: (a) breach by

State Street or any State Street Personnel of any of its data protection, information security or confidentiality obligations hereunder or under a Service Module to which such Fund is a signatory; (b) any claim of infringement or misappropriation of any Intellectual Property Right alleged to have occurred because of systems or other Intellectual Property provided by or on behalf of State Street or based upon the performance of the Services (collectively, the “State Street Infringement Items”), except to the extent that such infringement or misappropriation relates to or results from; (i) changes made by any Fund or by a third party at the direction of a Fund to the State Street Infringement Items; (ii) changes to the State Street Infringement Items recommended by State Street and not made due to a request from any Fund, provided that State Street has notified such Fund that failure to implement such recommendation would result in infringement within a reasonable amount of time for such Fund to so implement following such notification; (iii) any Fund’s combination of the State Street Infringement Items with products or services not provided or approved in writing by State Street, except to the extent such combination arises out of any Fund’s use of the State Street Infringement Items in a manner consistent with the applicable business requirements documentation; (iv) designs or specifications that in themselves infringe and that are provided by or at the direction of any Fund (except in the event of a knowing infringement by State Street); or (v) use by a Fund of any of the State Street Infringement Items in a manner that is not consistent with the applicable business requirements documentation or otherwise not permitted under the Master Services Agreement or any Service Module; (c) any claim or action by, on behalf of, or related to, any prospective, then-current or former employees of State Street, arising from or in connection with a Service Module to which a Fund is a signatory, including: (i) any claim arising under occupational health and safety, worker’s compensation, ERISA or other applicable Law; (ii) any claim arising from the interview or hiring practices, actions or omissions of employees of State Street; (iii) any claim relating to any violation by employees of State Street, or its respective officers, directors, employees, representatives or agents, of any Law or any common law protecting persons or members of protected classes or categories, such laws or regulations prohibiting discrimination or harassment on the basis of a protected characteristic; and (iv) any claim based on a theory that such Fund is an employer or joint employer of any such prospective, then-current or former employees of State Street; (d) the failure by State Street to obtain, maintain, or comply with any governmental approvals as required under the Master Services Agreement and/or a Service Module to which such Fund is a signatory or such other failures as otherwise agreed by the Parties from time to time; (e) claims by third parties arising from claims by governmental authorities against such Customer for fines, penalties, sanctions, late fees or other remedies to the extent arising from or in connection with State Street’s failure to perform its responsibilities under the Master Services Agreement or any Service Module (except to the extent a Fund is not permitted as a matter of public policy to have such an indemnity for financial penalties arising from criminal actions); (f) claims by clients of State Street relating to services, products or systems provided by State Street or a Subcontractor to such client(s) in a shared or leveraged environment; (g) any claim initiated by an Affiliate or potential or actual Subcontractor of State Street asserting rights in connection with a Service Module to which such Fund is a signatory; or (h) other claims as otherwise agreed by the Parties from time to time.

The Master Services Agreement also provides that applicable Fund will indemnify, defend and hold harmless State Street, its Affiliates and their respective officers, directors, employees, agents and permitted successors and assigns from any and all Losses arising from or in connection with any third party claim based or threatened third party claim to the extent that such Losses are based on or arising out of any of the following: (a) breach by such Fund of any of its confidentiality obligations hereunder or under a Service Module to which such Fund is a signatory; (b) any claim or action by, on behalf of, or related to, any prospective, then-current or former employees of such Fund arising from or in connection with a Service Module to which such Fund is a signatory, including: (i) any claim arising under occupational health and safety, worker’s compensation, ERISA or other applicable Law; (ii) any claim arising from the interview or hiring practices, actions or omissions of such Fund; (iii) any claim relating to any violation by such Fund, or its officers, directors, employees, representatives or agents, of any Law or any common law protecting persons or members of protected classes or categories, such laws or regulations prohibiting discrimination or harassment on the basis of a protected characteristic; and (iv) any claim based on a theory that State Street is an employer or joint employer of any such prospective, then current or former employee of such Fund.

Each Party will indemnify, defend and hold harmless the other Party and their respective officers, directors, employees, agents, successors and assigns from any and all Losses arising from or in connection with any of the following, including Losses arising from or in connection with any third party claim or threatened third party claim: (a) the death or bodily injury of an agent, employee, customer, business invitee or business visitor or other person caused by the tortious or criminal conduct of the other Party; or (b) the damage, loss or destruction of real or tangible personal property caused by the tortious or criminal conduct of the other Party.

The Distribution Agreement provides that the Trust agrees to indemnify, defend and hold harmless, BRIL, each of its directors, officers, principals, representatives, employees and each person, if any, who controls BRIL within the meaning of Section 15 of the 1933 Act (collectively, the “BRIL Indemnified Parties”) on an as-incurred basis from and against any and all losses, claims, damages or liabilities whatsoever (including any investigation, legal or other expenses incurred in connection with, and any amount paid in settlement of, any action, suit or proceeding or any claim asserted) (collectively, “Losses”) to which the BRIL Indemnified Parties become subject, arising out of or based upon (i) any untrue statement or alleged untrue statement of a material fact contained in any Prospectus or the omission or alleged omission therefrom of a material fact required to be stated therein or necessary to make the statements therein not misleading and (ii) any breach of any representation, warranty or covenant made by the Trust in this Agreement; provided, however, that the Trust

shall not be liable in any such case to the extent that any Loss arises out of or is based upon (A) an untrue statement or alleged untrue statement or omission or alleged omission made in the Prospectus about BRIL in reliance upon and in conformity with written information furnished to the Trust by BRIL expressly for use therein; (B) BRIL’s own willful misfeasance, willful misconduct or gross negligence or BRIL’s reckless disregard of its obligations under this Agreement or arising out of the failure of BRIL to deliver a current Prospectus; or (C) BRIL’s material breach of this Agreement.

The Distribution Agreement also provides that BRIL agrees to indemnify and hold harmless the Trust, each of its trustees, officers, employees and each person, if any, who controls the Trust within the meaning of Section 15 of the 1933 Act (collectively, the “Trust Indemnified Parties”) from and against any and all losses to which the Trust Indemnified Parties become subject, arising out of or based upon (i) any untrue statement or alleged untrue statement of a material fact contained in the Prospectus or the omission or alleged omission therefrom of a material fact required to be stated therein or necessary to make the statements therein not misleading, in reliance upon and in conformity with written information furnished to the Trust by BRIL about BRIL expressly for use therein; (ii) any breach of any representation, warranty or covenant made by BRIL in the Distribution Agreement; and (iii) the actions or omissions of any person acting under the supervision of BRIL in providing services under the Distribution Agreement; provided, however, that BRIL shall not be liable in any such case to the extent that any loss arises out of or is based upon (A) the Trust’s own willful misfeasance, willful misconduct or gross negligence or the Trust’s reckless disregard of its obligations under the Distribution Agreement or (B) the Trust’s material breach of the Distribution Agreement.

The Authorized Participant Agreement provides that the Authorized Participant (the “Participant”) agrees to indemnify and hold harmless the Fund and its respective subsidiaries, affiliates, directors, officers, employees and agents, and each person, if any, who controls such persons within the meaning of Section 15 of the 1933 Act (each an “Indemnified Party”) from and against any loss, liability, cost and expense (including attorneys’ fees) incurred by such Indemnified Party as a result of (i) any breach by the Participant of any provision of the Authorized Participant Agreement that relates to the Participant; (ii) any failure on the part of the Participant to perform any of its obligations set forth in the Authorized Participant Agreement; (iii) any failure by the Participant to comply with applicable laws, including rules and regulations of self-regulatory organizations; or (iv) actions of such Indemnified Party in reliance upon any instructions issued in accordance with Annex II, III or IV (as each may be amended from time to time) of the Authorized Participant Agreement reasonably believed by the distributor and/or the transfer agent to be genuine and to have been given by the Participant.

Section 5.1 of the Fifth Amended and Restated Securities Lending Agency Agreement:

The Fifth Amended and Restated Securities Lending Agency Agreement provides that the Trust on behalf of each Fund agrees to indemnify BTC and to hold it harmless from and against any and all costs, expenses, damages, liabilities or claims (including reasonable fees and expenses of counsel) which BTC may sustain or incur or which may be asserted against BTC by reason of or as a result of any action taken or omitted by BTC in connection with or arising out of BTC’s operating under and in compliance with this Agreement, except those costs, expenses, damages, liabilities or claims arising out of BTC’s negligence, bad faith, willful misconduct, or reckless disregard of its obligations and duties hereunder. Actions taken or omitted in reasonable reliance upon Oral Instructions or Written Instructions, any Certificate, or upon any information, order, indenture, stock certificate, power of attorney, assignment, affidavit or other instrument reasonably believed by BTC to be genuine or bearing the signature of a person or persons reasonably believed by BTC to be genuine or bearing the signature of a person or persons reasonably believed to be authorized to sign, countersign or execute the same, shall be presumed to have been taken or omitted in good faith.

The Fifth Amended and Restated Securities Lending Agency Agreement also provides that BTC shall indemnify and hold harmless the Trust and each Fund, its Board of Trustees and its agents and BFA and any investment adviser for the Funds from any and all loss, liability, costs, damages, actions, and claims (“Loss”) to the extent that any such Loss arises out of the material breach of this Agreement by or negligent acts or omissions or willful misconduct of BTC, its officers, directors or employees or any of its agents or subcustodians in connection with the securities lending activities undertaken pursuant to this Agreement, provided that BTC’s indemnification obligation with respect to the acts or omissions of its subcustodians shall not exceed the indemnification provided by the applicable subcustodian to BTC.

The Trust is advised by BFA, an indirect wholly owned subsidiary of BlackRock, Inc., 400 Howard Street, San Francisco, CA 94105. BFA’s business is that of a registered investment adviser to certain open-end, management investment companies and various other institutional investors.

The directors and officers of BFA consist primarily of persons who during the past two years have been active in the investment management business. To the knowledge of the Registrant, except as set forth below, none of the directors or executive officers of BFA is or has been at any time during the past two fiscal years engaged in any other business, profession, vocation or employment of a substantial nature. Information as to the executive officers and directors of BFA is included in its Form ADV filed with the SEC (File No. 801-22609) and is incorporated herein by reference.

BIL acts as sub-adviser for a number of affiliated registered investment companies advised by BFA. The address of each of these registered investment companies is 400 Howard Street, San Francisco, CA 94105. The address of BIL is Exchange Place One, 1 Semple Street, Edinburgh, EH3 8BL, United Kingdom. To the knowledge of the Registrant, except as set forth below, none of the directors or executive officers of BIL is or has been at any time during the past two fiscal years engaged in any other business, profession, vocation or employment of a substantial nature. Information as to the executive officers and directors of BIL is included in its Form ADV filed with the SEC (File No. 801-51087) and is incorporated herein by reference.

BRIL, the distributor of certain funds, acts as the principal underwriter or placement agent, as applicable, for each of the following open-end registered investment companies including certain funds of the Registrant:

BRIL provides numerous financial services to BlackRock-advised funds and is the distributor of BlackRock’s open-end funds. These services include coordinating and executing Authorized Participation Agreements, preparing, reviewing and providing advice with respect to all sales literature and responding to Financial Industry Regulatory Authority comments on marketing materials.

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all the requirements for the effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933, as amended, and the Registrant has duly caused this Post-Effective Amendment No. 623 to the Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of San Francisco and the State of California on the 25^th day of February, 2022.

Pursuant to the requirements of the Securities Act of 1933, as amended, this Post-Effective Amendment No. 623 to the Registration Statement has been signed below by the following persons in the capacities and on the date indicated.

Fund		Ticker		Listing Exchange
iShares Bloomberg Roll Select Commodity Strategy ETF (the “Fund”)		CMDY		NYSE Arca

	Page
General Description of the Trust and the Fund	1
Exchange Listing and Trading	1
Investment Strategies and Risks	2
Borrowing	3
Derivatives	4
Diversification Status	4
Futures and Options	4
Lending Portfolio Securities	4
Liquidity Risk Management	5
Options on Futures Contracts	6
Privately Issued Securities	6
Regulation Regarding Derivatives	6
Repurchase Agreements	7
Reverse Repurchase Agreements	7
Short-Term Instruments and Temporary Investments	7
Swap Agreements	8
Future Developments	8
General Considerations and Risks	8
Borrowing Risk	8
Commodities Investment Risk	8
Commodity Forward Risk	9
Commodity-Linked Derivatives Risk	9
Dividend-Paying Stock Risk	9
Illiquid Investments Risk	10
LIBOR Risk	10
LIBOR Replacement Risk	10
Non-U.S. Issuers Risk	11
Operational Risk	11
Risk of Derivatives	11
Risk of Futures and Options on Futures Transactions	11
Risk of Swap Agreements	12
Valuation Risk	12
Risk of Investing in Asia	12
Risk of Investing in Australasia	13
Risk of Investing in Developed Countries	13
Risk of Investing in Europe	14

	Page
Risk of Investing in the Energy Sector	15
Risk of Investing in Gold	15
Proxy Voting Policy	16
Portfolio Holdings Information	16
Construction and Maintenance of the Underlying Index	17
The Bloomberg Roll Select Commodity Total Return Index	17
Investment Policies	18
Fundamental Investment Policies	18
Non-Fundamental Investment Policies	19
Continuous Offering	20
Management	20
Trustees and Officers	20
Committees of the Board of Trustees	27
Remuneration of Trustees and Advisory Board Members	32
Control Persons and Principal Holders of Securities	33
Conflicts of Interest	33
Investment Advisory, Administrative and Distribution Services	41
Investment Adviser	41
Portfolio Managers	42
Codes of Ethics	44
Anti-Money Laundering Requirements	44
Administrator, Custodian and Transfer Agent	44
Distributor	45
Securities Lending	45
Payments by BFA and its Affiliates	46
Determination of Net Asset Value	48
Brokerage Transactions	50
Additional Information Concerning the Trust	53
Shares	53
DTC as Securities Depository for Shares of the Fund	54
Distribution of Shares	55
Creation and Redemption of Creation Units	55
General	55
Fund Deposit	56
Cash Purchase Method	56
Procedures for Creation of Creation Units	56
Role of the Authorized Participant	57

	Page
Purchase Orders	57
Timing of Submission of Purchase Orders	57
Acceptance of Orders for Creation Units	58
Issuance of a Creation Unit	58
Costs Associated with Creation Transactions	58
Redemption of Creation Units	59
Cash Redemption Method	60
Costs Associated with Redemption Transactions	60
Placement of Redemption Orders	60
Custom Baskets	61
Taxation on Creations and Redemptions of Creation Units	62
Taxes	63
Regulated Investment Company Qualifications	63
Taxation of RICs	63
Excise Tax	64
Net Capital Loss Carryforwards	64
Taxation of U.S. Shareholders	64
Sales of Shares	65
Backup Withholding	66
Sections 351 and 362	66
Taxation of Certain Derivatives	66
Qualified Dividend Income	67
Corporate Dividends Received Deduction	67
Excess Inclusion Income	67
Reporting	68
Other Taxes	68
Taxation of Non-U.S. Shareholders	68
Financial Statements	69
Miscellaneous Information	69
Counsel	69
Independent Registered Public Accounting Firm	69
Shareholder Communications to the Board	69
Investors’ Rights	70
Appendix A1 - iShares ETFs Proxy Voting Policy	A-1
Appendix A2 – BlackRock Global Proxy Voting Policies	A-2
Appendix A3 – BlackRock U.S. Proxy Voting Policies	A-13

•	The strength of the U.S. dollar. Because the price of gold is generally inversely related to the value of the U.S. dollar, a stronger U.S. dollar tends to keep the price of gold lower and more controlled, while a weaker U.S. dollar is likely to drive the price of gold higher. During times of economic uncertainty and when the dollar is weak, investments in gold tend to increase.
•	Large sales, including those by governments, central banks and related institutions, which own a significant portion of the aggregate world holdings in gold. If one or more of these institutions decide to sell in amounts large enough to cause a decline in world gold prices, the performance of the Fund may be adversely affected.
•	Changes in the supply and demand of goods or services of large users of gold. For example, as demand for consumer goods such as jewelry and electronics increases, the price of gold can rise.

•	A significant increase in gold hedging activity by gold producers. Should there be an increase in the level of hedge activity of gold producing companies, it could cause a decline in world gold prices, negatively affecting the performance of the Fund.
•	A significant change in the attitude of speculators and investors towards gold. Should the speculative community take a negative view towards gold, it could cause a decline in world gold prices, negatively affecting the performance of the Fund.

•	Communications with Listing Exchanges: From time to time, employees of BFA may discuss portfolio holdings information with the applicable primary listing exchange for the Fund as needed to meet the exchange listing standards.
•	Communications with Other Portfolio Managers: Certain information may be provided to employees of BFA who manage funds that invest a significant percentage of their assets in shares of an underlying fund as necessary to manage the fund’s investment objective and strategy.
•	Communication of Other Information: Certain explanatory information regarding the Files is released to Authorized Participants and liquidity providers on a daily basis, but is only done so after the Files are posted to www.iShares.com.
•	Third-Party Service Providers: Certain portfolio holdings information may be disclosed to Fund Trustees and their counsel, outside counsel for the Fund, auditors and to certain third-party service providers (i.e., fund administrator, custodian, proxy voting service) for which a non-disclosure, confidentiality agreement or other obligation is in place with such service providers, as may be necessary to conduct business in the ordinary course in a manner consistent with applicable policies, agreements with the Fund, the terms of the current registration statements and federal securities laws and regulations thereunder.
•	Liquidity Metrics: “Liquidity Metrics,” which seek to ascertain the Fund’s liquidity profile under BlackRock’s global liquidity risk methodology, include but are not limited to: (a) disclosure regarding the number of days needed to liquidate a portfolio or the portfolio’s underlying investments; and (b) the percentage of the Fund’s NAV invested in a particular liquidity tier under BlackRock’s global liquidity risk methodology. The dissemination of position-level liquidity metrics data and any non-public regulatory data pursuant to the Liquidity Rule (including SEC liquidity tiering) is not permitted unless pre-approved. Disclosure of portfolio-level liquidity metrics prior to 60 calendar days after calendar quarter-end requires a non-disclosure or confidentiality agreement and approval of the Trust’s Chief Compliance Officer. Portfolio-level liquidity metrics disclosure subsequent to 60 calendar days after calendar quarter-end requires the approval of portfolio management and must be disclosed to all parties requesting the information if disclosed to any party.

•	No single commodity (e.g., natural gas, silver) may constitute more than 15% of the Index;
•	No single commodity, together with its derivatives (e.g., WTI crude oil and Brent crude oil, together with ULS diesel, Unleaded gas, and Low Sulphur Gas Oil ), may constitute more than 25% of the Index;
•	No related group of commodities (e.g., energy, precious metals, livestock or grains) may constitute more than 33% of the Index;
•	No single commodity (e.g., natural gas, silver) may constitute less than 2% of the Index as liquidity allows.

1.	Concentrate its investments in a particular industry, as that term is used in the Investment Company Act.
2.	Borrow money, except as permitted under the Investment Company Act.
3.	Issue senior securities to the extent such issuance would violate the Investment Company Act.
4.	Purchase or hold real estate, except the Fund may purchase and hold securities or other instruments that are secured by, or linked to, real estate or interests therein, securities of real estate investment trusts, mortgage-related securities and securities of issuers engaged in the real estate business, and the Fund may purchase and hold real estate as a result of the ownership of securities or other instruments.
5.	Underwrite securities issued by others, except to the extent that the sale of portfolio securities by the Fund may be deemed to be an underwriting or as otherwise permitted by applicable law.
6.	Purchase or sell commodities or commodity contracts, except as permitted by the Investment Company Act.
7.	Make loans to the extent prohibited by the Investment Company Act.

Name (Age)	Position	Principal Occupation(s) During the Past 5 Years	Other Directorships Held by Trustee
Robert S. Kapito¹ (65)	Trustee (since 2011).	President, BlackRock, Inc. (since 2006); Vice Chairman of BlackRock, Inc. and Head of BlackRock’s Portfolio Management Group (since its formation in 1998) and BlackRock, Inc.’s predecessor entities (since 1988); Trustee, University of Pennsylvania (since 2009); President of Board of Directors, Hope & Heroes Children’s Cancer Fund (since 2002).	Director of BlackRock, Inc. (since 2006); Director of iShares, Inc. (since 2009); Trustee of iShares Trust (since 2009).
Salim Ramji² (51)	Trustee (since 2019).	Senior Managing Director, BlackRock, Inc. (since 2014); Global Head of BlackRock’s ETF and Index Investments Business (since 2019); Head of BlackRock’s U.S. Wealth Advisory Business (2015-2019); Global Head of Corporate Strategy, BlackRock, Inc. (2014-2015); Senior Partner, McKinsey & Company (2010-2014).	Director of iShares, Inc. (since 2019); Trustee of iShares Trust (since 2019).

¹	Robert S. Kapito is deemed to be an “interested person” (as defined in the 1940 Act) of the Trust due to his affiliations with BlackRock, Inc. and its affiliates.
²	Salim Ramji is deemed to be an “interested person” (as defined in the 1940 Act) of the Trust due to his affiliations with BlackRock, Inc. and its affiliates.

Name	Fund	Dollar Range of Equity Securities in Named Fund	Aggregate Dollar Range of Equity Securities in all Registered Investment Companies Overseen by Trustee in Family of Investment Companies
Robert S. Kapito	None	None	None

Salim Ramji	iShares Broad USD Investment Grade Corporate Bond ETF	Over $100,000	Over $100,000
	iShares Commodity Curve Carry Strategy ETF	$50,001-$100,000
	iShares Core Dividend Growth ETF	Over $100,000
	iShares Core MSCI Emerging Markets ETF	Over $100,000
	iShares Core MSCI Total International Stock ETF	$1-$10,000
	iShares Core S&P 500 ETF	$1-$10,000
	iShares Core S&P Mid-Cap ETF	Over $100,000
	iShares Core S&P Small-Cap ETF	Over $100,000
	iShares Core S&P Total U.S. Stock Market ETF	$1-$10,000
	iShares Expanded Tech Sector ETF	$1-$10,000
	iShares Expanded Tech-Software Sector ETF	$1-$10,000
	iShares GSCI Commodity Dynamic Roll Strategy ETF	$50,001-$100,000
	iShares MSCI USA ESG Select ETF	$1-$10,000
	iShares Robotics and Artificial Intelligence Multisector ETF	$1-$10,000
	iShares TIPS Bond ETF	$50,001-$100,000

John E. Kerrigan	iShares Core S&P 500 ETF	Over $100,000	Over $100,000
	iShares Core S&P Small-Cap ETF	$50,001-$100,000
	iShares ESG Advanced MSCI EAFE ETF	$1-$10,000
	iShares ESG Advanced MSCI USA ETF	$10,001-$50,000
	iShares ESG Aware MSCI EAFE ETF	$10,001-$50,000
	iShares ESG Aware MSCI EM ETF	$50,001-$100,000
	iShares ESG Aware MSCI USA ETF	Over $100,000
	iShares ESG Aware MSCI USA Small-Cap ETF	$10,001-$50,000
	iShares Exponential Technologies ETF	Over $100,000

Name	iShares Bloomberg Roll Select Commodity Strategy ETF	Pension or Retirement Benefits Accrued As Part of Trust Expenses¹	Estimated Annual Benefits Upon Retirement¹	Total Compensation From the Fund and Fund Complex²
Independent Trustees:

Jane D. Carlin	$82	Not Applicable	Not Applicable	$420,000
Richard L. Fagnani	87	Not Applicable	Not Applicable	446,764
Cecilia H. Herbert	93	Not Applicable	Not Applicable	475,000
John E. Kerrigan	87	Not Applicable	Not Applicable	445,000
Drew E. Lawton	84	Not Applicable	Not Applicable	431,764
John E. Martinez	82	Not Applicable	Not Applicable	420,000

¹	No Trustee or officer is entitled to any pension or retirement benefits from the Trust.
²	Also includes compensation for service on the Board of Trustees of iShares Trust and the Board of Directors of iShares, Inc.

Name and Address		Percentage of Ownership
Charles Schwab & Co., Inc. 101 Montgomery Street San Francisco, CA 94014		25.65%
National Financial Services LLC 499 Washington Blvd Jersey City, NJ 07310		16.47%
Huntington National Bank/FBO School Employee Retirement System Of Ohio 5555 Cleveland Ave Columbus, OH 43231		10.95%
TD Ameritrade Clearing, Inc. 4700 Alliance Gateway Freeway Fort Worth, TX 76177		7.80%
Brown Brothers Harriman & Co. 525 Washington Blvd. 11^th Floor Jersey City, NJ 07310		7.01%

Management Fee for Fiscal Year Ended Oct. 31, 2021		Fund Inception Date		Management Fees Paid Net of Waivers for Fiscal Year Ended Oct. 31, 2021		Management Fees Paid Net of Waivers for Fiscal Year Ended Oct. 31, 2020		Management Fees Paid Net of Waivers for Fiscal Year Ended Oct. 31, 2019
0.28%¹		04/03/18		$268,995		$76,360		$64,429

Richard Mejzak
Types of Accounts	Number	Total Assets
Registered Investment Companies	21	$438,694,000,000
Other Pooled Investment Vehicles	27	203,579,000,000
Other Accounts	117	145,692,000,000

Greg Savage
Types of Accounts	Number	Total Assets
Registered Investment Companies	258	$1,948,257,000,000
Other Pooled Investment Vehicles	44	57,541,000,000
Other Accounts	63	20,758,000,000

Paul Whitehead (as of November 30, 2021)
Types of Accounts	Number	Total Assets
Registered Investment Companies	0	N/A
Other Pooled Investment Vehicles	0	N/A
Other Accounts	0	N/A

Amy Whitelaw
Types of Accounts	Number	Total Assets
Registered Investment Companies	333	$2,091,285,000,000
Other Pooled Investment Vehicles	261	903,738,000,000
Other Accounts	133	698,943,000,000

Richard Mejzak
Types of Accounts	Number of Other Accounts with Performance Fees Managed by Portfolio Manager	Aggregate of Total Assets
Registered Investment Companies	0	N/A
Other Pooled Investment Vehicles	0	N/A
Other Accounts	0	N/A

Fund Inception Date		Custody, Administration, Transfer Agency Expenses Paid During Fiscal Year Ended Oct. 31, 2021		Custody, Administration, Transfer Agency Expenses Paid During Fiscal Year Ended Oct. 31, 2020		Custody, Administration, Transfer Agency Expenses Paid During Fiscal Year Ended Oct. 31, 2019
04/03/18		$19,272		$17,846		$17,064

Fund Inception Date		Brokerage Commissions Paid During Fiscal Year Ended October 31, 2021		Brokerage Commissions Paid During Fiscal Year Ended October 31, 2020		Brokerage Commissions Paid During Fiscal Year Ended October 31, 2019
04/03/18		$93,154		$38,502		$ 43,125

	Fiscal Year ended Oct. 31, 2021		Fiscal Year ended Oct. 31, 2020
	0%		0%

Shares Per Creation Unit		Approximate Value Per Creation Unit (U.S.$)
50,000		$2,783,000

Standard Creation Transaction Fee		Maximum Additional Charge*
$225		7.0%

Standard Redemption Transaction Fee		Maximum Additional Charge*
$225		2.0%

Contents
Introduction to BlackRock	A-4
Philosophy on corporate governance	A-4
Corporate governance, engagement and voting	A-4
- Boards and directors	A-5
- Auditors and audit-related issues	A-6
- Capital structure, mergers, asset sales and other special transactions	A-7
- Compensation and benefits	A-7
- Environmental and social issues	A-8
- General corporate governance matters and shareholder protections	A-9
BlackRock’s oversight of its investment stewardship activities	A-9
- Oversight	A-9
- Vote execution	A-10
- Conflicts management policies and procedures	A-11
- Voting guidelines	A-12
- Reporting and vote transparency	A-12

•	Boards and directors
•	Auditors and audit-related issues
•	Capital structure, mergers, asset sales and other special transactions
•	Compensation and benefits
•	Environmental and social issues
•	General corporate governance matters and shareholder protections

•	establishing an appropriate corporate governance structure
•	supporting and overseeing management in setting long-term strategic goals, applicable measures of value-creation and milestones that will demonstrate progress, and steps taken if any obstacles are anticipated or incurred
•	ensuring the integrity of financial statements
•	making independent decisions regarding mergers, acquisitions and disposals
•	establishing appropriate executive compensation structures
•	addressing business issues, including environmental and social issues, when they have the potential to materially impact company reputation and performance