Harbor ETF Trust Funds Prospectus

Prospectus

Harbor ETF Trust

March 1, 2023

Fund	Exchange	Ticker

Harbor Commodity All-Weather Strategy ETF (formerly, Harbor All-Weather Inflation Focus ETF)	NYSE	HGER
Harbor Corporate Culture ETF	NYSE Arca, Inc.	HAPI
Harbor Corporate Culture Leaders ETF	NYSE Arca, Inc.	HAPY
Harbor Disruptive Innovation ETF	NYSE Arca, Inc.	INNO
Harbor Dividend Growth Leaders ETF	NYSE	GDIV
Harbor Energy Transition Strategy ETF	NYSE Arca, Inc.	RENW
Harbor Health Care ETF	NYSE Arca, Inc.	MEDI
Harbor International Compounders ETF	NYSE Arca, Inc.	OSEA
Harbor Long-Term Growers ETF	NYSE	WINN
Harbor Scientific Alpha High-Yield ETF	NYSE Arca, Inc.	SIHY
Harbor Scientific Alpha Income ETF	NYSE Arca, Inc.	SIFI

The Securities and Exchange Commission (SEC) and the Commodity Futures Trading Commission (CFTC) have not approved any Fund’s shares as an investment or determined whether this Prospectus is accurate or complete. Anyone who tells you otherwise is committing a crime.

Table of Contents

Fund Summaries
Harbor Commodity All-Weather Strategy ETF (formerly, Harbor All-Weather Inflation Focus ETF)	1
Harbor Corporate Culture ETF	6
Harbor Corporate Culture Leaders ETF	10
Harbor Disruptive Innovation ETF	14
Harbor Dividend Growth Leaders ETF	18
Harbor Energy Transition Strategy ETF	22
Harbor Health Care ETF	28
Harbor International Compounders ETF	31
Harbor Long-Term Growers ETF	35
Harbor Scientific Alpha High-Yield ETF	39
Harbor Scientific Alpha Income ETF	44
Additional Information about the Funds' Investments
Investment Objective	49
Investment Policies	49
Indexing and Index Description	49
Principal Investments	54
Investments in the Wholly Owned Subsidiary	63
Non-Principal Investments	63
Exchange-Traded Fund Structure	64
Portfolio Turnover	64
Portfolio Holdings Disclosure Policy	64
The Advisor
Harbor Capital Advisors, Inc.	65
Portfolio Management	66

The Subadvisors
Model Portfolio Providers	69
Portfolio Management	69
Shareholder Information
Valuing Fund Shares	76
Buying and Selling Shares	76
Distribution and Service (12b-1) Fees	77
Investing Through a Financial Intermediary	77
Book Entry	77
Frequent Purchases and Redemptions of Shares	77
Investments by Registered Investment Companies	77
Note to Authorized Participants Regarding Continuous Offering	78
Shareholder and Account Policies
Dividends, Distributions and Taxes	79
Taxes on Creations and Redemptions of Creation Units	80
Cost Basis	80
Financial Highlights	81
Financial Performance of the Funds	81
For More Information
Fund Details	87

Harbor Commodity All-Weather Strategy ETF (formerly, Harbor All-Weather Inflation Focus ETF)

Fund Summary

Investment Objective

The Fund seeks to provide investment results that correspond, before fees and expenses, to the performance of the Quantix Commodity Index (formerly, the Quantix Inflation Index) (the “Index”).

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.

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

	Rate
Management Fees	0.68%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses1	0.00%
Total Annual Fund Operating Expenses	0.68%

1 Pursuant to the Investment Advisory Agreement, the Advisor pays all of the operating expenses of the Fund (inclusive of any expenses of a wholly owned subsidiary of the Fund), except for (i) the fee payment under the Investment Advisory Agreement; (ii) payments under the Fund’s 12b-1 plan (if any); (iii) the costs of borrowing, including interest and dividend expenses; (iv) taxes and governmental fees; (v) acquired fund fees and expenses; (vi) brokers’ commissions and any other transaction-related expenses and fees arising out of transactions effected on behalf of the Fund; (vii) costs of holding shareholder meetings; and (viii) litigation and indemnification expenses and other extraordinary expenses not incurred in the ordinary course of the Fund’s business.

Expense Example

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other exchange-traded funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated. 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, under these assumptions, your costs would be:

	One Year	Three Years	Five Years	Ten Years
Cost	$69	$218	$379	$847

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Expense Example, do affect the Fund’s performance. During the most recent fiscal year, the Fund did not have a portfolio turnover rate because the Fund invested only in instruments that are excluded from portfolio turnover rate calculations.

Principal Investment Strategy

The Fund seeks to provide investment results that correspond, before fees and expenses, to the performance of the Index, which was developed by Quantix Commodities Indices LLC (“QCI” or the “Index Provider”), an affiliate of Quantix Commodities LP, the Fund’s subadvisor (“Quantix” or the “Subadvisor”). The Index is composed of futures contracts on physical commodities and is constructed using QCI’s proprietary quantitative methodology, which considers a commodity’s relative inflation sensitivity and the relative cost of holding a “rolling” futures position in the commodity (as described below).

Under normal market conditions, the Index contains at least 15 U.S. dollar-denominated commodity futures traded on exchanges in the United States and United Kingdom. A commodity futures contract is a legal agreement to buy or sell a particular commodity (for example, metals, oil or agricultural products) at a predetermined price at a specified time in the future. As of the date of this Prospectus, the following commodity futures are considered for inclusion in the Index: WTI crude oil, Brent crude oil, heating oil, gasoil, RBOB gasoline, natural gas, corn, wheat, KC wheat, soybeans, soymeal, soybean oil, cocoa, cotton, coffee, sugar, live cattle, lean hogs, copper, aluminum, nickel, zinc, gold and silver.

Commodity futures in the eligible universe are selected for the Index and weighted based on Quantix’s quantitative methodology, which involves five steps:

Step 1: Quantix calculates the economic significance of each eligible commodity futures contract (i.e., the weight of each such commodity futures contract relative to the size of the eligible universe).

Step 2: Quantix calculates a “quality score” for each eligible commodity futures contract based on (i) the sensitivity of the futures contract to inflation and (ii) the cost of holding a rolling futures position in the contract. “Rolling” means selling a futures contract as it nears its expiration date and replacing it with a new futures contract that has a later expiration date. If the price for the new futures contract is lower than the price of the expiring contract, then the market for the commodity is said to be in “backwardation.” In these markets, roll returns are positive. The term “contango” is used to describe a market in which the price for a new futures contract is higher than the price of the expiring contract. In these markets, roll returns are negative. The quality score is negative for commodity futures contracts that have a relatively lower inflation sensitivity and/or roll return and positive for commodity futures contracts that have a relatively higher inflation sensitivity and/or roll return.

Step 3: The weights of eligible commodity futures contracts determined based on their economic significance are then adjusted based on their quality scores. A relatively low quality score results in a weight lower than the economic significance weight and a relatively high quality score results in a weight higher than the economic significance weight.

Step 4: Quantix applies maximum sector weights and maximum and minimum commodity weights to ensure diversification within the Index.

Step 5: Quantix utilizes its proprietary “Scarcity Debasement Indicator” (“SDI”) to determine whether the weight of gold-linked futures contracts should be adjusted based on the market environment. If the SDI signals an environment where inflation is more likely a result of a general shortage of commodities relative to demand, the weight of gold-linked futures contracts is as determined by steps 1 through 4. If the SDI signals an environment where inflation is more likely a result of currency debasement

Fund Summary
Harbor Commodity All-Weather Strategy ETF (formerly, Harbor All-Weather Inflation Focus ETF)

(i.e., a weakening currency), the weight of gold-linked futures contracts is increased in accordance with the strength of the indicator.

The Fund seeks to achieve its investment objective primarily by investing, through its Subsidiary (as defined below), in one or more excess return swaps on the Index. Excess return swaps are derivative contracts between two parties who exchange the return from a financial asset between them. The Fund will make payments to a swap dealer counterparty based on a set rate in exchange for payments based on the returns of the futures contracts comprising the Index. If the returns on those securities are positive, the counterparty will pay the Fund; in the event that the returns are negative, the Fund will make payments to the counterparty. The swaps may be terminated by the Subadvisor at any time. The Fund also holds U.S. Treasury securities and/or money market funds, which may be used as collateral for the Fund’s derivatives holdings or to generate interest income and capital appreciation on the cash balances arising from its use of derivatives (thereby providing a “total return” investment in the underlying commodity futures contracts).

The Fund may invest in commodity futures contracts if it at any time it is impractical or inefficient to gain full or partial exposure to a commodity through the use of excess return swaps, including on a different commodity (including commodities not included in the Index) that the Subadvisor believes will help the Fund achieve its investment objective.

To the extent that a significant portion of the Index consists of a particular sector or commodity, the Fund may have significant exposure to that sector or commodity. As of the date of this Prospectus, a significant portion of the Index consists of, and therefore the Fund has significant exposure to, the petroleum and precious metals sectors.

The Fund will invest up to 25% of its total assets, as determined at the end of each fiscal quarter, in a wholly owned and controlled subsidiary (the “Subsidiary”) organized under the laws of the Cayman Islands. The Fund’s investment in the Subsidiary is expected to provide the Fund with exposure to commodity returns within the limits of the federal tax laws, which limit the ability of investment companies such as the Fund to invest directly in such instruments. The Subsidiary has the same investment objective and will follow the same general investment policies and restrictions as the Fund. Unlike the Fund, the Subsidiary may invest without limitation in commodity-linked derivative instruments. Except as noted, references to the Fund’s investment strategies and risks include those of its Subsidiary. The Subsidiary is advised by Harbor Capital Advisors, Inc. (“Harbor Capital” or the “Advisor”) and subadvised by the Subadvisor.

The Fund is classified as non-diversified, which means the Fund may invest in the securities of a smaller number of issuers than a diversified fund.

Principal Risks

Investors considering an investment in the Fund should be prepared to accept significant volatility in the Fund’s performance, particularly over shorter time periods. The Fund is not intended to serve as a core holding in an investor’s portfolio but instead should represent only a small portion of an investor’s overall diversified portfolio. Investors considering an investment in this Fund should be sure they carefully read and understand the investment strategies employed and the heightened risks associated with those strategies.

There is no guarantee that the investment objective of the Fund will be achieved. Commodities and commodity-linked derivative instruments can be significantly more volatile than other securities, such as stocks or bonds. Similarly, the Index can be significantly more volatile than broad market equity and fixed income indices. The value of your investment in the Fund may go down, which means that you could lose money on your investment in the Fund or the Fund may not perform as well as other possible investments. Principal risks impacting the Fund (in alphabetical order after the first eight) include:

Commodity Risk: The Fund has exposure to commodities through its and/or the Subsidiary’s investments in commodity-linked derivative instruments. Commodity prices are generally affected by, among other factors, the cost of producing, transporting and storing commodities, changes in consumer or commercial demand for commodities, the hedging and trading strategies of producers and consumers of commodities, speculative trading in commodities by commodity pools and other market participants, disruptions in commodity supply, weather, political and other global events, global economic factors and government intervention in or regulation of the commodity or commodity futures markets. The Fund may concentrate its assets in a particular sector of the commodities market (such as oil, metal or agricultural products) in order to seek to track the Index. As a result, the Fund may be more susceptible to risks associated with those sectors.

Excess Return Swaps Risk: Excess return swaps could result in losses if the underlying asset or reference does not perform as anticipated. Excess return swaps can have the potential for unlimited losses. They are also subject to counterparty risk. If the counterparty fails to meet its obligations, the Fund may lose money.

Index Construction Risk: QCI selects a limited number of commodity futures contracts for the Index based on its proprietary methodology. The theories and assumptions upon which QCI bases the Index and/or the methodology used in constructing the Index may be inaccurate. The Fund may outperform or underperform other funds that invest in similar asset classes but employ different investment styles. QCI’s assessment of a commodity and/or futures contract may differ from that of another investor or investment manager. Errors in the construction or calculation of the Index may occur from time to time and any such errors may not be immediately identified and corrected by QCI or Solactive, respectively, which may have an adverse impact on the Fund and its shareholders. There is no guarantee that the construction methodology will accurately provide the intended exposure.

Sector Risk: To the extent that the Fund has significant exposure to a particular sector or commodity, the Fund will be subject to the risk that economic, political or other conditions that have a negative effect on that sector or commodity will negatively impact the Fund to a greater extent than if the Fund’s assets were invested in a wider variety of sectors or commodities.

Index Tracking Risk: The Fund is not expected to track the performance of the Index at all times with perfect accuracy. The Fund’s return may not track the performance of the Index for a

Fund Summary
Harbor Commodity All-Weather Strategy ETF (formerly, Harbor All-Weather Inflation Focus ETF)

number of reasons. For example, tracking error may occur because of differences between the securities and other financial instruments held in the Fund’s portfolio and those included in the 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, or the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of dividends or interest. Any transaction costs and market exposure arising from rebalancing the Fund’s portfolio to reflect changes in the composition of the Index will be borne directly by the Fund and its shareholders. The Fund may not be able to invest in certain securities included in the Index or may not be able to invest in them in the exact proportions in which they are represented in the Index, due to legal restrictions, potential adverse tax consequences or other regulatory reasons. The risk that the Fund may not track the performance of the Index may be magnified during times of heightened market volatility or other unusual market conditions. For tax efficiency purposes, the Fund may sell certain securities to realize losses causing it to deviate from the Index.

Index Strategy Risk: The Fund is managed to seek to track, before fees and expenses, the performance of the Index. Therefore, unless a specific security is removed from the Index because it no longer qualifies to be included in the Index, the Fund generally would not sell a security because the security’s issuer is in financial trouble. If a specific security is removed from the Index, it is possible that the Fund may be forced to sell such security at an inopportune time or for prices other than at current market values, which could have a negative effect on the Fund’s performance. As a result, the Advisor will not use techniques or defensive strategies designed to lessen the effects of market volatility or to reduce the impact of periods of market decline. Thus, based on market and economic conditions, the Fund’s performance could be lower than funds that actively shift their portfolio assets to take advantage of market opportunities or to lessen the impact of a market decline or a decline in the value of one or more securities.

Authorized Participant Concentration/Trading Risk: Only authorized participants (“APs”) may engage in creation or redemption transactions directly with the Fund. The Fund has a limited number of institutions that may act as APs and such APs have no obligation to submit creation or redemption orders. Consequently, there is no assurance that APs will establish or maintain an active trading market for the shares. This risk may be heightened to the extent that securities held by the Fund are traded outside a collateralized settlement system. In that case, APs may be required to post collateral on certain trades on an agency basis (i.e., on behalf of other market participants), which only a limited number of APs may be able to do. In addition, to the extent that APs exit the business or are unable to proceed with creation and/or redemption orders with respect to the Fund and no other AP is able to step forward to create or redeem Creation Units (as defined below), this may result in a significantly diminished trading market for shares, and shares may be more likely to trade at a premium or discount to the Fund’s net asset value and to face trading halts and/or delisting. This risk may be heightened during periods of volatility or market disruptions.

for shares will be closely related, but not identical, to the same forces influencing the prices of the holdings of the Fund trading individually or in the aggregate at any point in time. This may result in the Fund’s shares trading significantly above (premium) or below (discount) the Fund’s net asset value, which will be reflected in the intraday bid/ask spreads and/or the closing price of shares as compared to net asst value. However, given that shares can be purchased and redeemed in Creation Units , and only to and from broker-dealers and large institutional investors that have entered into participation agreements (unlike shares of closed-end funds, which frequently trade at appreciable discounts from, and sometimes at premiums to, their net asset value), the Advisor believes that large discounts or premiums to the net asset value of shares should not be sustained. During stressed market conditions, the market for the Fund’s shares may become less liquid in response to deteriorating liquidity in the market for the Fund’s underlying portfolio holdings, which could in turn lead to differences between the market price of the Fund’s shares and their net asset value.

Cash Transactions Risk: The Fund will effect some or all of its creations and redemptions for cash rather than in-kind. As a result, an investment in the Fund may be less tax-efficient than an investment in an ETF that effects all of its creations and redemptions in-kind. Because the Fund may effect redemptions for cash, it may be required to sell portfolio securities in order to obtain the cash needed to distribute redemption proceeds. A sale of portfolio securities may result in capital gains or losses and may also result in higher brokerage costs. To the extent costs are not offset by transaction fees charged by the Fund to APs, the costs of cash transactions will be borne by the Fund.

Commodity-Linked Derivatives Risk: The Fund’s investments in commodity-linked derivative instruments (either directly or through the Subsidiary) and the tracking of an Index comprised of commodity futures may subject the Fund to significantly greater volatility than investments in traditional securities. The value of commodity-linked derivative instruments may be affected by prevailing spot prices for the underlying commodity, supply and demand, market activity, liquidity, economic, financial, political regulatory, geographical, biological or judicial events, and the general interest rate environment. 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. If all or a significant portion of the futures contracts reflected in the Index were to reach a negative price, you could lose your entire investment. Each trading facility on which the derivatives are traded has the right to suspend or limit trading in the instruments that it lists. Certain of the futures contracts in which the Fund may invest trade on non-U.S. exchanges that impose different requirements than U.S. exchanges. These futures contracts may be subject to additional risks, including greater price volatility, temporary price aberrations and the potential imposition of limits that constrain appreciation or cause depreciation of the prices of such futures contracts, as well as different and longer settlement periods. The Fund will incur certain costs as a result of its use of derivatives. The Fund’s use of commodity-linked derivatives may also have a leveraging effect on the Fund’s portfolio. 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 otherwise would have had. The Fund is required to post margin in respect to certain of its holdings in derivatives.

Fund Summary
Harbor Commodity All-Weather Strategy ETF (formerly, Harbor All-Weather Inflation Focus ETF)

decline. The Fund may also not be able to exercise remedies, such as the termination of transactions, netting of obligations and realization on collateral if such remedies are stayed or eliminated under special resolutions adopted in the United States or other jurisdictions.

In addition, the Fund may enter into swap agreements with a limited number of counterparties, which may increase the Fund’s exposure to counterparty credit risk. Counterparties may be less willing to enter into transactions in stressed or volatile market conditions or may alter the terms they are willing to accept in such conditions. Further, there is a risk that no suitable counterparties will be willing to enter into, or continue to enter into, transactions with the Fund, which may cause the Fund not to be able to achieve its investment objective or to change its investment objective.

Energy Sector Risk: The performance of energy-related commodities, including petroleum, 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, exploration and production spending, and energy supply and demand; global political changes; terrorism, natural disasters and other catastrophes; changes in exchange rates; and 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 resulted in the market price of the front month WTI crude oil futures contract falling below zero for a period of time.

Interest Rate Risk: As interest rates rise, the values of fixed income securities held by the Fund are likely to decrease and reduce the value of the Fund’s portfolio. Securities with longer durations tend to be more sensitive to changes in interest rates and are usually more volatile than securities with shorter durations. For example, a 5 year average duration generally means the price of a fixed income security will decrease in value by 5% if interest rates rise by 1%. Rising interest rates may lead to increased redemptions, increased volatility and decreased liquidity in the fixed income markets, making it more difficult for the Fund to sell its fixed income securities when the Subadvisor may wish to sell or must sell to meet redemptions. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low or the Fund may be unable to maintain positive returns or minimize the volatility of the Fund’s net asset value per share. Changing interest rates may have unpredictable effects on the markets, may result in heightened market volatility and may detract from Fund performance. In addition, changes in monetary policy may exacerbate the risks associated with changing interest rates.

Market Risk: Securities markets are volatile and can decline significantly in response to adverse market, economic, political, regulatory or other developments, which may lower the value of securities held by the Fund, sometimes rapidly or unpredictably. Events such as war, acts of terrorism, social unrest, natural disasters, recessions, inflation, rapid interest rate changes, supply chain disruptions, sanctions, the spread of infectious illness or other public health threats could also significantly impact the Fund and its investments.

New Fund Risk: There can be no assurance that the Fund will grow to or maintain an economically viable size, in which case the Board of Trustees may determine to liquidate the Fund. The Board of Trustees may liquidate the Fund at any time in accordance with the Declaration of Trust and governing law. As a result, the timing of the Fund’s liquidation may not be favorable.

Non-Diversification Risk: Because the Fund is non-diversified and may invest a greater percentage of its assets in securities of a single issuer, and/or invest in a relatively small number of issuers, it is more susceptible to risks associated with a single economic, political or regulatory occurrence than a more diversified portfolio.

Precious Metals Investment Risk: Prices of precious metals, including gold and silver, and of precious metal-related financial instruments historically have been very volatile and may fluctuate sharply over short periods of time. The high volatility of precious metals 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 or 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.

Subsidiary Risk: By investing in the Subsidiary, the Fund is indirectly exposed to the risks associated with the Subsidiary’s investments. The derivatives and other investments held by the Subsidiary generally are 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. The Subsidiary is not registered under the Investment Company Act of 1940 (the “Investment Company Act”), and, unless otherwise noted in this prospectus, is not subject to all of the investor protections of the Investment Company Act. In addition, changes in the laws of the United States and/or the Cayman Islands could result in the inability of the Fund and/or the Subsidiary to operate as described in this Prospectus and the Statement of Additional Information and could adversely affect the Fund.

Tax Risk: The ability of the Fund to gain commodity exposure as contemplated may be adversely affected by future legislation, regulatory developments, interpretive guidance or other actions by the Internal Revenue Service (“IRS”) or the Treasury Department

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 exposure to U.S. Treasury obligations to decline.

Performance

Because the Fund is newly organized and does not yet have a complete calendar year of performance history, the bar chart and total return tables are not provided. Please note that the Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. To obtain performance information, please visit the Fund’s website at harborcapital.com or call 800-422-1050.

Fund Summary
Harbor Commodity All-Weather Strategy ETF (formerly, Harbor All-Weather Inflation Focus ETF)

Portfolio Management

Investment Advisor

Harbor Capital Advisors, Inc.

Subadvisor

Quantix Commodities LP (“Quantix”) has subadvised the Fund since 2022.

Portfolio Manager

The portfolio manager is responsible for the day-to-day investment decision making for the Fund.

Matthew Schwab

Quantix Commodities LP

Mr. Schwab is a Portfolio Manager at Quantix and has served as a portfolio manager for the Fund since February 2022.

Buying and Selling Fund Shares

Individual Fund shares may only be bought and sold in the secondary market through a broker or dealer at a market price. Shares of the Fund are listed and traded on an exchange at market price throughout the day rather than at NAV and may trade at a price greater than the Fund’s NAV (premium) or less than the Fund’s NAV (discount). An investor may incur costs attributable to the difference between the highest price a buyer is willing to pay to purchase shares (bid) and the lowest price a seller is willing to accept for shares (ask) when buying or selling Fund shares in the secondary market (the “bid-ask spread”). Recent information, including information regarding the Fund’s NAV, market price, premiums and discounts, and bid-ask spread, is available at harborcapital.com.

Tax Information

Distributions you receive from the Fund are subject to federal income tax and may also be subject to state and local taxes. These distributions will generally be taxed as ordinary income or capital gains, unless you are investing through a tax-deferred retirement account, such as a 401(k) plan or individual retirement account. Investments in tax-deferred accounts may be subject to tax when they are withdrawn.

Payments to Broker-Dealers and Other Financial Intermediaries

The Advisor and/or its related companies have in the past and could in the future pay intermediaries, which may include banks, broker-dealers, or financial professionals, for marketing activities and presentations, educational training programs, conferences, the development of technology platforms and reporting systems and data or other services related to the sale of Fund shares and related services. These payments create a conflict of interest by influencing the broker-dealer or other intermediary and your sales representative to recommend the Fund over another investment. Ask your sales representative or visit your financial intermediary’s website for more information.

Harbor Corporate Culture ETF

Fund Summary

Investment Objective

The Fund seeks to provide investment results that correspond, before fees and expenses, to the performance of the CIBC Human Capital Index (the “Index”).

Fees and Expenses of the Fund

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

	Rate
Management Fees	0.35%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses1,2	0.00%
Acquired Fund Fees and Expenses2	0.01%
Total Annual Fund Operating Expenses	0.36%

1 Pursuant to the Investment Advisory Agreement, the Advisor pays all of the operating expenses of the Fund, except for (i) the fee payment under the Investment Advisory Agreement; (ii) payments under the Fund’s 12b-1 plan (if any); (iii) the costs of borrowing, including interest and dividend expenses; (iv) taxes and governmental fees; (v) acquired fund fees and expenses; (vi) brokers’ commissions and any other transaction-related expenses and fees arising out of transactions effected on behalf of the Fund; (vii) costs of holding shareholder meetings; and (viii) litigation and indemnification expenses and other extraordinary expenses not incurred in the ordinary course of the Fund’s business.

2 “Other Expenses” and “Acquired Fund Fees and Expenses” are estimated for the current fiscal year.

Expense Example

	One Year	Three Years
Cost	$37	$116

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Expense Example, do affect the Fund’s performance. For the period from October 12, 2022 through October 31, 2022, the Fund’s portfolio turnover rate was 2%. Portfolio turnover rate excludes investments received or delivered from in-kind processing of creation unit purchases or redemptions.

Principal Investment Strategy

The Fund employs an indexing investment approach designed to track the performance of the Index. The Fund invests at least 80% of its total assets in securities that are included in the Index.

The Index consists of a modified market capitalization-weighted portfolio of equity securities of approximately 150 U.S. companies identified by Irrational Capital LLC (“Irrational Capital”) as those it believes to possess strong corporate culture based on its proprietary scoring methodology. The Index was developed by the Canadian Imperial Bank of Commerce (“CIBC”).

Irrational Capital calculates Human Capital Factor scores based on a proprietary, rules-based scoring methodology it developed by leveraging its research in behavioral science, data science and human capital. The scoring methodology seeks to quantitatively measure the contribution of a company’s corporate culture to its financial performance. Irrational Capital calculates Human Capital Factor scores based on a combination of multiple characteristics, such as

◾

Employee engagement and motivation

◾

Trust and transparency

◾

Point of view diversity

◾

Compensation fairness

The significance of each characteristic to the calculation of the Human Capital Factor scores varies at the time of each calculation based on the most recent data obtained by Irrational Capital. Irrational Capital expects to continue to refine its proprietary methods over time.

Constituents of the Solactive GBS United States 500 Index, which intends to track the performance of the largest 500 companies from the U.S. stock market (the “index universe”), at the time of Index reconstitution are eligible for inclusion in the Index. Each company in the index universe that is also identified by Irrational Capital on its list of high-scoring companies (based on the most current scores as of each reconstitution) will be included in the Index. Index constituents in the same sector are weighted based on their float-adjusted market capitalizations, subject to certain caps on individual stock weights. On reconstitution dates, the Index will target the same sector weights as the index universe. If after the Index’s weighting and capping rules are applied, a sector’s weight in the Index would be less than its weight in the index universe, the Index will include exchange-traded funds that invest specifically in the stocks and securities of the corresponding sector (known as sector ETFs), or such other sector proxy as the CIBC may determine, to fill the remaining weight and ensure sector neutrality as compared with the index universe on the reconstitution date.

The Index has been created and licensed to Harbor Capital Advisors, Inc. (the “Advisor or “Harbor Capital”) by the CIBC and is calculated, published and distributed by Solactive AG (“Solactive”). The Index is comprised of equity securities traded on U.S. public securities exchanges as well as sector ETFs. The Fund may purchase American Depositary Receipts (ADRs), which are certificates typically issued by a bank or trust company that represent ownership interests in securities issued by a foreign or domestic company. The Fund may concentrate its investments in a particular sector, industry or group of industries from time to time to the extent that the Index concentrates in a sector, industry or group of industries. As of the date of this Prospectus, the Index is concentrated in, and therefore the Fund has significant exposure to, the

Fund Summary
Harbor Corporate Culture ETF

information technology sector. Under normal circumstances, the Index is reconstituted annually.

The Fund uses an indexing investment approach to attempt to approximate, before fees and expenses, the investment performance of the Index. The Fund generally will use a replication strategy, which means that the Fund seeks to hold each security found in the Index (including shares of sector ETFs included in the Index) in approximately the same proportion as represented in the Index itself. There also may be instances in which the Advisor may choose to underweight or overweight a security in the Index, purchase securities not in the Index that the Advisor believes are appropriate to substitute for certain securities in the Index or utilize various combinations of other available investment techniques in seeking to replicate as closely as possible, before fees and expenses, the performance of the Index. The Fund may sell securities that are represented in the Index in anticipation of their removal from the Index or purchase securities not represented in the Index in anticipation of their addition to the Index. The Fund does not take temporary defensive positions when markets decline or appear overvalued.

Principal Risks

There is no guarantee that the investment objective of the Fund will be achieved. Stocks fluctuate in price and the value of your investment in the Fund may go down. This means that you could lose money on your investment in the Fund or the Fund may not perform as well as other investment options. Principal risks impacting the Fund (in alphabetical order after the first eight risks) include:

Equity Risk: The values of equity or equity-related securities may decline due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. They may also decline due to factors that affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry. Equity securities generally have greater price volatility than fixed income securities.

in the Index or may not be able to invest in them in the exact proportions in which they are represented in the Index, due to legal restrictions, potential adverse tax consequences or other regulatory reasons. The risk that the Fund may not track the performance of the Index may be magnified during times of heightened market volatility or other unusual market conditions. For tax efficiency purposes, the Fund may sell certain securities to realize losses causing it to deviate from the Index.

Index Construction Risk: The Index Provider selects companies for the Index based on a proprietary methodology. The theories upon which the Index Provider bases the Index and/or Irrational Capital bases the methodology used in scoring companies for the Index may be unsound. The Index Provider and Irrational Capital rely on third-party data they believe to be reliable in constructing the Index and scoring companies, but neither guarantees the accuracy or availability of any such third-party data, and there is also no guarantee with respect to the accuracy, availability or timeliness of the production of the Index. The Fund may outperform or underperform other funds that invest in similar asset classes but employ different investment styles. Companies will be excluded from the Index if sufficient data is not available to produce a score, which may result in the exclusion of companies that could otherwise be considered to have strong corporate culture. The Index Provider’s assessment of a company may differ from that of another investor or investment manager. Errors in the construction or calculation of the Index may occur from time to time and any such errors may not be immediately identified and corrected, which may have an adverse impact on the Fund and its shareholders. There is no guarantee that the construction methodology will accurately provide exposure to strong corporate culture. The use of sector ETFs or other sector proxies to maintain sector neutrality may result in indirect exposure to companies that do not have strong corporate culture and would not otherwise be included in the Index.

Data Risk: The Index Provider relies heavily on information and data provided by third-parties, including the list of high scoring companies provided by Irrational Capital and used to select companies for the Index. Such third-party data includes information derived from survey data. There is no guarantee that survey data will be accurate, complete or representative of a company’s status with respect to its corporate culture. Survey data may be subject to certain biases, including response bias and non-response bias. Furthermore, information derived from survey data may not reflect the most current status of a company, and a company’s financial results may deteriorate prior to a corresponding decline in survey data results. Because the Index is reconstituted only annually, there could be a significant delay before a company’s current status is reflected in the Index. If survey data is unreliable or outdated, the Index may not be successful in providing the specified exposure.

Fund Summary
Harbor Corporate Culture ETF

Premium/Discount Risk: The market price of the Fund’s shares will generally fluctuate in accordance with changes in the Fund’s net asset value as well as the relative supply of and demand for shares on the Exchange. The Advisor cannot predict whether shares will trade below, at or above their net asset value because the shares trade on the Exchange at market prices and not at net asset value. Price differences may be due, in large part, to the fact that supply and demand forces at work in the secondary trading market for shares will be closely related, but not identical, to the same forces influencing the prices of the holdings of the Fund trading individually or in the aggregate at any point in time. This may result in the Fund’s shares trading significantly above (premium) or below (discount) the Fund’s net asset value, which will be reflected in the intraday bid/ask spreads and/or the closing price of shares as compared to net asst value. However, given that shares can be purchased and redeemed in Creation Units , and only to and from broker-dealers and large institutional investors that have entered into participation agreements (unlike shares of closed-end funds, which frequently trade at appreciable discounts from, and sometimes at premiums to, their net asset value), the Advisor believes that large discounts or premiums to the net asset value of shares should not be sustained. During stressed market conditions, the market for the Fund’s shares may become less liquid in response to deteriorating liquidity in the market for the Fund’s underlying portfolio holdings, which could in turn lead to differences between the market price of the Fund’s shares and their net asset value.

Concentration Risk: The Fund’s assets may be concentrated in a particular sector, industry or group of industries to the extent the Index is so concentrated. Concentration of the Fund’s assets in a particular sector, industry or group of industries will subject the Fund to the risk that economic, political or other conditions that have a negative effect on that sector, industry or group of industries will negatively impact the Fund to a greater extent than

if the Fund’s assets were concentrated in a wider variety of sectors or industries.

Depositary Receipts Risk: Depositary receipts are certificates evidencing ownership of shares of a foreign issuer. These certificates are issued by depository banks and generally trade on an established market in the U.S. or elsewhere. The underlying shares are held in trust by a custodian bank or similar financial institution. The depository bank may not have physical custody of the underlying securities at all times and may charge fees for various services, including forwarding dividends and interest and corporate actions. Depositary receipts are alternatives to directly purchasing the underlying foreign securities in their national markets and currencies. Depositary receipts are subject to the risks associated with investing directly in foreign securities.

Information Technology Sector Risk: Companies in the information technology sector can be significantly affected by short product cycles, obsolescence of existing technology, impairment or loss of intellectual property rights, falling prices and profits, competition from new market entrants, government regulation and other factors.

Investment in Other Investment Companies Risk: Investments in other investment companies (including money market funds) are subject to market and selection risk. In addition, if the Fund acquires shares of investment companies, shareholders bear both their proportionate share of expenses in the Fund and, indirectly, the expenses of the investment companies. In addition to these risks, a sector ETF may fail to accurately track the market segment or index that underlies its investment objective and the market price of the underlying ETF’s shares may trade at a premium or a discount to their net asset value.

Issuer Risk: An adverse event affecting a particular issuer in which the Fund is invested, such as an unfavorable earnings report, may depress the value of that issuer’s stock, sometimes rapidly or unpredictably.

Large Cap Risk: Large cap stocks may fall out of favor relative to small or mid cap stocks, which may cause the Fund to underperform other equity funds that focus on small or mid cap stocks.

Performance

Fund Summary
Harbor Corporate Culture ETF

Portfolio Management

Investment Advisor

Harbor Capital Advisors, Inc.

Portfolio Managers

The portfolio managers are jointly and primarily responsible for the day-to-day investment decision making for the Fund.

Stephen Cook, Managing Director, ETFs of Harbor Capital, has managed the Fund since 2022.

James Erceg, Executive Vice President and Head of Product at Harbor Capital, has managed the Fund since 2022.

Buying and Selling Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Harbor Corporate Culture Leaders ETF

Fund Summary

Investment Objective

The Fund seeks to provide investment results that correspond, before fees and expenses, to the performance of the Human Capital Factor Unconstrained Index (the “Index”).

Fees and Expenses of the Fund

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

	Rate
Management Fees	0.50%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses1	0.00%
Total Annual Fund Operating Expenses	0.50%

Expense Example

	One Year	Three Years	Five Years	Ten Years
Cost	$51	$160	$280	$628

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Expense Example, do affect the Fund’s performance. For the period from February 23, 2022 through October 31, 2022, the Fund’s portfolio turnover rate was 18%. Portfolio turnover rate excludes investments received or delivered from in-kind processing of creation unit purchases or redemptions.

Principal Investment Strategy

The Fund employs an indexing investment approach designed to track the performance of the Index. The Fund invests at least 80% of its total assets in securities that are included in the Index.

The Index is designed to deliver exposure to equity securities of U.S. companies that are “corporate culture leaders” based on scores produced by Irrational Capital LLC (“Irrational Capital” or the “Index Provider”). “Corporate culture leaders” are those companies with high “Human Capital Factor” scores, which are determined by Irrational Capital in accordance with a rules-based methodology that seeks to identify companies that best manage their human capital, resulting in highly motivated and engaged employees. Companies with market capitalizations in excess of $1 billion at the time of Index reconstitution are eligible for inclusion in the Index. The Index is equally weighted and composed of approximately 70 to 100 companies with top Human Capital Factor scores at the time of Index reconstitution.

The Index Provider calculates Human Capital Factor scores based on a proprietary scoring methodology developed by Irrational Capital leveraging its research in behavioral science, data science and human capital. The scoring methodology seeks to quantitatively measure the contribution of a company’s corporate culture to its financial performance. Irrational Capital calculates Human Capital Factor scores based on a combination of multiple characteristics, such as

◾

Employee engagement and motivation

◾

Trust and transparency

◾

Point of view diversity

◾

Compensation fairness

The significance of the various characteristics varies with each reconstitution based on the most current data. The Index Provider expects to continue to refine its proprietary methods over time.

The Index has been created and licensed to the Advisor by Irrational Capital and is calculated, published and distributed by Solactive AG (“Solactive”). The Index is comprised of equity securities traded on U.S. public securities exchanges. The Fund may purchase American Depositary Receipts (ADRs), which are certificates typically issued by a bank or trust company that represent ownership interests in securities issued by a foreign or domestic company. The Fund may concentrate its investments in a particular sector, industry or group of industries from time to time to the extent that the Index concentrates in a sector, industry or group of industries. As of the date of this Prospectus, the Index is concentrated in the group of industries comprising the information technology sector. Under normal circumstances, the Index is reconstituted annually and rebalanced quarterly.

The Fund uses an indexing investment approach to attempt to approximate, before fees and expenses, the investment performance of the Index. The Fund generally will use a replication strategy, which means that the Fund seeks to hold each security found in the Index in approximately the same proportion as represented in the Index itself. There also may be instances in which Harbor Capital Advisors, Inc. (the “Advisor or “Harbor Capital”) may choose to underweight or overweight a security in the Index, purchase securities not in the Index that the Advisor believes are appropriate to substitute for certain securities in the Index or utilize various combinations of other available investment techniques in seeking to replicate as closely as possible, before fees and expenses, the performance of the Index. The Fund may sell securities that are represented in the Index in anticipation of their removal from

Fund Summary
Harbor Corporate Culture Leaders ETF

the Index or purchase securities not represented in the Index in anticipation of their addition to the Index. The Fund does not take temporary defensive positions when markets decline or appear overvalued.

Principal Risks

Index Tracking Risk: The Fund is not expected to track the performance of the Index at all times with perfect accuracy. The Fund’s return may not track the performance of the Index for a number of reasons. For example, tracking error may occur because of differences between the securities held in the Fund’s portfolio and those included in the 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, or the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of dividends or interest. Any transaction costs and market exposure arising from rebalancing the Fund’s portfolio to reflect changes in the composition of the Index will be borne directly by the Fund and its shareholders. The Fund may not be able to invest in certain securities included in the Index or may not be able to invest in them in the exact proportions in which they are represented in the Index, due to legal restrictions, potential adverse tax consequences or other regulatory reasons. The risk that the Fund may not track the performance of the Index may be magnified during times of heightened market volatility or other unusual market conditions. For tax efficiency purposes, the Fund may sell certain securities to realize losses causing it to deviate from the Index.

have a negative effect on the Fund’s performance. As a result, the Advisor will not use techniques or defensive strategies designed to lessen the effects of market volatility or to reduce the impact of periods of market decline. Thus, based on market and economic conditions, the Fund’s performance could be lower than funds that actively shift their portfolio assets to take advantage of market opportunities or to lessen the impact of a market decline or a decline in the value of one or more securities.

Index Construction Risk: The Index Provider selects a limited number of companies for the Index based on its proprietary methodology. The theories upon which the Index Provider bases the Index and/or the methodology used in scoring companies for the Index may be inaccurate. The Index Provider relies on third-party data it believes to be reliable in constructing the Index, but it does not guarantee the accuracy or availability of any such third-party data, and there is also no guarantee with respect to the accuracy, availability or timeliness of the production of the Index. The Fund may outperform or underperform other funds that invest in similar asset classes but employ different investment styles. Companies will be excluded from the Index if sufficient data is not available to produce a score, which may result in the exclusion of companies that could otherwise be considered corporate culture leaders. The Index provider’s assessment of a company may differ from that of another investor or investment manager. Errors in the construction or calculation of the Index may occur from time to time and any such errors may not be immediately identified and corrected by Irrational Capital or Solactive, respectively, which may have an adverse impact on the Fund and its shareholders. There is no guarantee that the construction methodology will accurately provide exposure to corporate culture leaders.

Fund Summary
Harbor Corporate Culture Leaders ETF

face trading halts and/or delisting. This risk may be heightened during periods of volatility or market disruptions.

Information Technology Sector Risk: Companies in the information technology sector can be significantly affected by short product cycles, obsolescence of existing technology, impairment or loss

of intellectual property rights, falling prices and profits, competition from new market entrants, government regulation and other factors.

Large Cap Risk: Large cap stocks may fall out of favor relative to small or mid cap stocks, which may cause the Fund to underperform other equity funds that focus on small or mid cap stocks.

Performance

Portfolio Management

Investment Advisor

Harbor Capital Advisors, Inc.

Portfolio Managers

The portfolio managers are jointly and primarily responsible for the day-to-day investment decision making for the Fund.

Stephen Cook, Managing Director, ETFs of Harbor Capital, has managed the Fund since 2022.

James Erceg, Executive Vice President and Head of Product at Harbor Capital, has managed the Fund since 2022.

Buying and Selling Fund Shares

Fund Summary
Harbor Corporate Culture Leaders ETF

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Harbor Disruptive Innovation ETF

Fund Summary

Investment Objective

The Fund seeks long-term growth of capital.

Fees and Expenses of the Fund

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

	Rate
Management Fees	0.75%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses1	0.00%
Total Annual Fund Operating Expenses	0.75%

Expense Example

	One Year	Three Years	Five Years	Ten Years
Cost	$77	$240	$417	$930

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Expense Example, do affect the Fund’s performance. For the period from December 1, 2021 through October 31, 2022, the Fund’s portfolio turnover rate was 71%. Portfolio turnover rate excludes investments received or delivered from in-kind processing of creation unit purchases or redemptions.

Principal Investment Strategy

Under normal market conditions, the Fund invests primarily in equity securities, principally common stocks, of companies selected based on their potential for growth tied to disruptive innovation. The Fund defines “disruptive innovation” as the development of new products, services, technologies and/or other advancements that could disrupt and displace existing businesses and business models over time. While the Fund invests primarily in securities of U.S. companies, the Fund may invest up to 25% of its assets in foreign securities, including those located in emerging market countries. The Fund invests in securities across the market capitalization spectrum.

The Fund employs a multi-manager approach to achieve its investment objective. The Fund’s investment adviser, Harbor Capital Advisors, Inc. (the “Advisor”) is responsible for selecting and overseeing investment subadvisors (each, a “Subadvisor”) for the Fund. Each Subadvisor is responsible for providing the Advisor with a model portfolio, which the Advisor will implement in its discretion in managing the Fund. Each Subadvisor has its own process for identifying and evaluating companies that, in the Subadvisor’s view, have the potential for growth tied to disruptive innovation. A Subadvisor may recommend selling holdings when it believes that such company’s prospects have deteriorated, future growth is unlikely, or for other reasons that a Subadvisor may identify. The Advisor is responsible for allocating the Fund’s assets among each Subadvisor’s strategy as well as implementing each strategy (which includes buying and selling securities as recommended by each Subadvisor). The Advisor does not expect to independently identify securities for investment for the Fund. The Advisor will determine allocations between each Subadvisor’s strategy and adjust those allocations over time based upon its qualitative and quantitative assessment of each strategy and how those strategies work in combination to produce what the Advisor believes is an enhanced risk-adjusted investment outcome for the Fund.

Holdings are expected to be diversified across sectors, but the Fund may, from time to time, have substantial exposure to a particular sector. Sector allocations are the result of the investment process for the Fund.

The equity securities in which the Fund invests include common stocks as well as preferred securities. The Fund may invest in securities issued by equity real estate investment trusts (REITs). The Fund may also purchase American Depositary Receipts (ADRs), European Depositary Receipts (EDRs), and Global Depositary Receipts (GDRs), which are certificates typically issued by a bank or trust company that represent ownership interests in securities issued by a foreign or domestic company.

The Advisor has selected 4BIO Partners LLP (“4BIO Capital”), NZS Capital, LLC (“NZS Capital”), Sands Capital Management, LLC (“Sands Capital”), Tekne Capital Management, LLC (“Tekne”) and Westfield Capital Management Company, L.P. (“Westfield”) to each serve as a Subadvisor to the Fund.

4BIO Capital recommends securities to the Advisor that reflect 4BIO Capital’s focus on new companies developing emerging technologies to disrupt the advanced therapies space, which includes gene therapy, gene editing, cell therapy, ribonucleic acid (RNA) therapy (treatments that target RNA or deliver it to cells), targeted therapies (cancer treatments targeted at specific genes and proteins) and microbiome (the collection of microorganisms living in or on the human body). 4BIO Capital assesses company valuations with a view toward their future potential value creation and typically recommends divestment either upon the company’s acquisition

Fund Summary
Harbor Disruptive Innovation ETF

by another market player or when 4BIO Capital believes that future growth is unlikely.

NZS Capital recommends securities of companies to the Advisor that it believes to be highly adaptable to the disruption presented by the transition of economies from analog to digital. Though many of the companies identified by NZS Capital for investment are in the technology and communication segments of the market, NZS Capital believes that disruption is increasingly impacting all sectors of the economy and may identify companies for investment across sectors.

Sands Capital recommends securities to the Advisor based on Sands Capital’s belief that disruptive innovation improves upon the status quo, whether the innovations are on a large or small scale. Sands Capital identifies companies that it believes to have a leadership position in a promising business space, a significant competitive advantage, a clear mission, a value-add focus, financial strength and a rational valuation relative to the market and their business prospects. Sands Capital uses bottom-up research to identify companies across all sectors that it believes are benefitting from structural changes and secular trends that are distinct from cyclical economic factors.

Tekne recommends securities to the Advisor based on Tekne’s belief that a disruptive innovation company is one that creates, uses or enables technology to change or influence an existing or new workflow, product or service. Tekne seeks to identify investments that it believes will derive success from longer-term growth rather than near-term momentum. Tekne relies on its expertise in the telecommunications, media and technology sectors as well as related industries such as fin-tech.

Westfield recommends securities to the Advisor based on Westfield’s belief that disruptive innovation companies are those providing disruptive products or services to large addressable markets and that maintain a culture of continued innovation as they gain market share. Westfield will primarily focus on U.S. markets with a specialization in technology and health care.

Principal Risks

Disruptive Innovation Risk: Companies that the Subadvisor and/or Advisor, as applicable, believes have the potential for growth tied to disruptive innovation may not in fact be successful. Companies developing new technologies, creating solutions, providing disruptive products or services, or which the Subadvisor and/or Advisor, as applicable, believes to have leadership positions or competitive advantages may not be able to capitalize on those developments or positions. Such companies may encounter competition, regulation or other barriers. These companies may also be exposed to risks applicable to sectors other than the disruptive innovation theme

for which they are chosen, and the securities issued by these companies may underperform the securities of other companies. The Fund may invest in a company that does not currently derive any revenue from disruptive innovations or technologies, and there is no assurance that a company will derive any revenue from disruptive innovations in the future. A disruptive innovation may constitute a small portion of a company’s overall business. As a result, the success of a disruptive innovation may not affect the value of the equity securities issued by the company.

Multi-Manager Risk: The Subadvisors’ investment styles and security recommendations may not always be complementary, which could affect the performance of the Fund. Moreover, the allocation of Fund assets among Subadvisors may lead the Fund to underperform relative to how it could have performed with a different allocation between Subadvisors.

Non-Discretionary Implementation Risk: Because the Fund is managed pursuant to model portfolios provided by non-discretionary Subadvisors, it is expected that trades will be effected on a periodic basis and therefore less frequently than would typically be the case if discretionary subadvisors were employed. Given that values of investments change with market conditions, this could cause the Fund’s return to be lower than if the Fund employed discretionary subadvisors.

Fund Summary
Harbor Disruptive Innovation ETF

Emerging Market Risk: Foreign securities risks are more significant in emerging market countries. These countries may have relatively unstable governments and less-established market economies than developed countries. Emerging markets may face greater social, economic, regulatory and political uncertainties. These risks make emerging market securities more volatile and less liquid than securities issued in more developed countries. Securities exchanges in emerging markets may suspend listed securities from trading for substantially longer periods of time than exchanges in developed markets, including for periods of a year or longer. If the Fund is holding a suspended security, that security would become completely illiquid as the Fund would not be able to dispose of the security until the suspension is lifted. In such instances, it can also be difficult to determine an appropriate valuation for the security because of a lack of trading and uncertainty as to when trading may resume.

Foreign Currency Risk: As a result of the Fund’s investments in securities denominated in, and/or receiving revenues in, foreign currencies, the Fund will be subject to currency risk. Currency risk is the risk that foreign currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency hedged. In either event, the dollar value of an investment in the Fund would be adversely affected.

Foreign Securities Risk: Because the Fund may invest in securities of foreign issuers, an investment in the Fund is subject to special risks in addition to those of U.S. securities. These risks include heightened political and economic risks, greater volatility, currency fluctuations, higher transaction costs, delayed settlement, possible foreign controls on investment, possible sanctions by governmental bodies of other countries and less stringent investor protection and disclosure standards of foreign markets. Foreign securities are sometimes less liquid and harder to value than securities of U.S. issuers. These risks are more significant for issuers in emerging market countries. Global economies and financial markets are becoming increasingly interconnected, and conditions and events in one country, region or financial market may adversely impact issuers in a different country, region or financial market.

Growth Style Risk: Over time, a growth oriented investing style may go in and out of favor, which may cause the Fund to underperform other equity funds that use different investing styles.

REIT Risk: Investing in REITs will subject the Fund to additional risks. The REITs in which the Fund invests may decline in value as a result of factors affecting the real estate sector, such as changes in real estate values, changes in property taxes and government regulation affecting zoning, land use and rents, changes in interest rates, changes in the cash flow of underlying real estate assets, levels of occupancy, and market conditions, as well as the management skill and creditworthiness of the issuer. Investments in REITs are also subject to additional risks, including the risk that REITs are unable to generate cash flow to make distributions to unitholders and fail to qualify for favorable tax treatment under the Internal Revenue Code of 1986, as amended.

Sector Risk: Because the Fund may, from time to time, be more heavily invested in particular sectors, the value of its shares may be especially sensitive to factors and economic risks that specifically affect those sectors. As a result, the Fund’s share price may fluctuate more widely than the value of shares of a mutual fund that invests in a broader range of sectors.

Selection Risk: The Subadvisor’s judgment about the attractiveness of a particular security may be incorrect. The Subadvisor and/or Advisor, as applicable, potentially will be prevented from executing investment decisions at an advantageous time or price as a result of domestic or global market disruptions, particularly disruptions causing heightened market volatility and reduced market liquidity, as well as increased or changing regulations. Thus, investments that the Subadvisor and/or Advisor, as applicable, believes represent an attractive opportunity or in which the Fund seeks to obtain exposure may be unavailable entirely or in the specific quantities or prices sought by the Subadvisor and/or Advisor, as applicable, and the Fund may need to obtain the exposure through less advantageous or indirect investments or forgo the investment at the time.

Small and Mid Cap Risk: The Fund’s performance may be more volatile because it may invest in issuers that are smaller companies. Smaller companies may have limited product lines, markets and financial resources. Securities of smaller companies are usually less stable in price and less liquid than those of larger, more established companies. Additionally, small and mid cap stocks

Fund Summary
Harbor Disruptive Innovation ETF

may fall out of favor relative to large cap stocks, which may cause the Fund to underperform other equity funds that focus on large cap stocks.

Performance

The following bar chart and tables are intended to help you understand the risks and potential rewards of investing in the Fund. The bar chart shows the performance of the Fund for the period shown. The table shows how the Fund’s average annual total returns compared to the returns of the Fund’s benchmark index, and another comparative index, which include securities with investment characteristics similar to those held by the Fund. Please note that the Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. To obtain updated performance information please visit the Fund’s website at harborcapital.com or call 800-422-1050.

Calendar Year Total Returns

During the time periods shown in the bar chart, the Fund’s highest and lowest returns for a calendar quarter were:

	Total Returns	Quarter/Year
Best Quarter	-2.25%	Q4 2022
Worst Quarter	-30.32%	Q2 2022

Average Annual Total Returns — As of December 31, 2022

	One Year	Annualized			Inception Date
	One Year	Five Years	Ten Years	Since Inception	Inception Date
Harbor Disruptive Innovation ETF
Before Taxes	-44.91%	N/A	N/A	-42.94%	12/1/2021
After Taxes on Distributions	-44.91%	N/A	N/A	-42.94%
After Taxes on Distributions and Sale of Fund Shares	-26.59%	N/A	N/A	-32.53%
Comparative Indices (reflects no deduction for fees, expenses or taxes)
S&P 500	-18.11%	N/A	N/A	-12.44%
Russell 3000® Growth	-28.97%	N/A	N/A	-24.41%

Portfolio Management

Investment Advisor

Harbor Capital Advisors, Inc.

Portfolio Managers

The portfolio managers are jointly and primarily responsible for the day-to-day investment decision making for the Fund.

Spenser P. Lerner, CFA, Head of Multi-Asset Solutions, Managing Director and Portfolio Manager of Harbor Capital Advisors, Inc., has managed the Fund since 2021.

Kristof Gleich, CFA, President & CIO of Harbor Capital Advisors, Inc., has managed the Fund since 2021.

Subadvisors

The Advisor has engaged 4BIO Capital, NZS Capital, Sands Capital, Tekne and Westfield as subadvisors since 2021 to provide investment management services to the Fund on a non-discretionary basis.

Buying and Selling Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Harbor Dividend Growth Leaders ETF

Fund Summary

Investment Objective

The Fund seeks long-term growth of capital.

Fees and Expenses of the Fund

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

	Rate
Management Fees	0.50%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses1	0.00%
Total Annual Fund Operating Expenses	0.50%

Expense Example

	One Year	Three Years	Five Years	Ten Years
Cost	$51	$160	$280	$628

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Expense Example, do affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 78%. The portfolio turnover rate shown includes that of the Westfield Capital Dividend Growth Fund (the “Predecessor Fund”). Portfolio turnover rate excludes investments received or delivered from in-kind processing of creation unit purchases or redemptions.

Principal Investment Strategy

Under normal market conditions, the Fund invests at least 80% of its net assets, plus borrowings for investment purposes, in dividend-paying equity securities. The Fund invests primarily in equity securities, principally common and preferred stocks of large capitalization companies with a history of paying dividends or as determined by the Subadvisor’s analysis, the ability to increase dividends in the future.

The Subadvisor uses a bottom-up process to identify companies which meet the Subadvisor’s fundamental criteria that evaluates companies on earnings, free cash flow generation and return of capital priorities, including dividends and stock buybacks. In constructing the Fund’s portfolio, the Subadvisor seeks to identify companies that it believes possess the following quantitative and qualitative characteristics:

◾

High quality balance sheet;

◾

Good stewards of capital;

◾

Consistent free cash flow generation; and

◾

History of dividend increases.

The Subadvisor then performs a qualitative review of each identified company to select companies for inclusion in the Fund’s portfolio. Such review may include interviews and other contact with company management. The investment process generally results in a portfolio of 30-50 companies and, from time to time, may result in more substantial investments in particular sectors. Sector allocations are the outcome of the Subadvisor’s investment process.

The Fund may also invest in other equity securities, including master limited partnerships (“MLPs”), American Depositary Receipts (“ADRs”) and Global Depositary Receipts (“GDRs”). The Fund may also invest in foreign securities (including through ADRs and GDRs), with such investments typically representing less than 35% of the Fund’s net assets.

The Subadvisor may sell a security if the security reaches or falls below a predetermined price target, a change in the company’s fundamentals negatively impacts the Subadvisor’s original investment thesis, there is a change in the company’s dividend policy, or the Subadvisor identifies what it believes to be a more attractive investment opportunity.

Principal Risks

Dividend Paying Stock Risk: The Fund’s emphasis on dividend-paying stocks involves the risk that such stocks may fall out of favor with investors and underperform the market. Also, a company may reduce or eliminate its dividend.

Fund Summary
Harbor Dividend Growth Leaders ETF

an industry. Equity securities generally have greater price volatility than fixed income securities.

including forwarding dividends and interest and corporate actions. Depositary receipts are alternatives to directly purchasing the underlying foreign securities in their national markets and currencies. Depositary receipts are subject to the risks associated with investing directly in foreign securities.

Limited Number of Holdings Risk: The Fund may invest in a limited number of companies. As a result, an adverse event affecting a particular company may hurt the Fund’s performance more than if it had invested in a larger number of companies. In addition, the Fund’s performance may be more volatile than a fund that invests in a larger number of companies.

MLP Risk: MLPs are limited partnerships in which the ownership units are publicly traded. MLPs often own several properties or businesses (or own interests) that are related to oil and gas industries or other natural resources, but they also may finance other projects. To the extent that an MLP’s interests are all in a particular industry, the MLP will be negatively impacted by economic events adversely impacting that industry. Additional risks of investing in a MLP also include those involved in investing in a partnership as opposed to a corporation. For example, state law governing partnerships is often less restrictive than state law governing corporations. Accordingly, there may be fewer protections afforded to investors in a MLP than investors in a corporation. For example, investors in MLPs may have limited voting rights or be liable under certain circumstances for amounts greater than the amount of their investment. In addition, MLPs may be subject to state taxation in certain jurisdictions which will have the effect of reducing the amount of income paid by the MLP to its investors.

Preferred Stock Risk: Preferred stocks in which the Fund may invest are sensitive to interest rate changes, and are also subject to equity risk, which is the risk that stock prices will fall over short or extended periods of time. The rights of preferred stocks on the distribution of a company’s assets in the event of a liquidation are generally subordinate to the rights associated with a company’s debt securities.

Sector Risk: Because the Fund may, from time to time, be more heavily invested in particular sectors, the value of its shares may

Fund Summary
Harbor Dividend Growth Leaders ETF

be especially sensitive to factors and economic risks that specifically affect those sectors. As a result, the Fund’s share price may fluctuate more widely than the value of shares of a mutual fund that invests in a broader range of sectors.

Performance

The Fund acquired the assets and assumed the then existing known liabilities of the Predecessor Fund on May 20, 2022 and the Fund is the performance successor of the reorganization. This means that the Predecessor Fund’s performance and financial history will be used by the Fund going forward from the date of reorganization. Accordingly, the performance of the Fund for periods prior to the reorganization is the performance of the Predecessor Fund and the performance shown in the bar chart and performance table for periods prior to July 26, 2013 is the performance of a private investment vehicle that predated the Predecessor Fund. The private investment vehicle was managed by the Subadviser using investment policies, objectives and guidelines that were in all material respects equivalent to the management of the Fund and Predecessor Fund. However, the private investment vehicle was not a registered investment company and so it was not subject to the same investment and tax restrictions as the Fund and Predecessor Fund. If it had been, its performance may have been lower. The performance of the Predecessor Fund has not been restated to reflect the annual operating expenses of the Fund, which are lower than those of the Predecessor Fund. Because the Fund has different fees and expenses than the Predecessor Fund, the Fund would also have had different performance results.

The following bar chart and tables are intended to help you understand the risks and potential rewards of investing in the Fund. The bar chart shows how the performance of the Fund has varied from one calendar year to another over the periods shown. The table shows how the Fund’s average annual total returns compared to the returns of the Fund’s benchmark index, which includes securities with investment characteristics similar to those held by the Fund. Please note that the Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. To obtain updated performance information please visit the Fund’s website at harborcapital.com or call 800-422-1050.

Calendar Year Total Returns

During the time periods shown in the bar chart, the Fund’s highest and lowest returns for a calendar quarter were:

	Total Returns	Quarter/Year
Best Quarter	14.29%	Q4 2021
Worst Quarter	-13.86%	Q4 2018

Average Annual Total Returns — As of December 31, 2022

	One Year	Annualized			Inception Date
	One Year	Five Years	Ten Years	Since Inception	Inception Date
Harbor Dividend Growth Leaders ETF
Before Taxes	-12.17%	10.54%	11.56%	11.25%	4/30/2010
After Taxes on Distributions	-13.33%	8.23%	N/A	N/A
After Taxes on Distributions and Sale of Fund Shares	-6.37%	8.20%	N/A	N/A
Comparative Indices (reflects no deduction for fees, expenses or taxes)
S&P 500	-18.11%	9.42%	12.56%	11.90%
NASDAQ Dividend Achievers Select Total Return Index	-9.52%	10.45%	12.11%	11.56%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns will depend on a shareholder’s individual tax situation and may differ from those shown. The after-tax returns shown are not relevant to tax-exempt shareholders or shareholders who hold their Fund shares through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account. In some cases, average annual total return “After Taxes on Distributions and Sale of Fund Shares” may exceed the return “Before Taxes” and/or “After Taxes on Distributions” due to an assumed tax benefit for any losses on a sale of Fund shares at the end of the measurement period. After tax returns cannot be calculated for periods before the Predecessor Fund’s registration as a mutual fund and they are, therefore, unavailable.

Fund Summary
Harbor Dividend Growth Leaders ETF

Portfolio Management

Investment Advisor

Harbor Capital Advisors, Inc.

Subadvisor

Westfield Capital Management Company, L.P. (“Westfield”) has subadvised the Fund since 2022.

Portfolio Manager

The portfolio manager is responsible for the day-to-day investment decision making for the Fund.

William A. Muggia

Westfield Capital Management Company, L.P.

Mr. Muggia is the President, Chief Investment Officer, Chief Executive Officer, a Portfolio Manager and Managing Partner of Westfield and has managed the Fund since 2022 and the Predecessor Fund since 2013.

Buying and Selling Fund Shares

a price greater than the Fund’s NAV (premium) or less than the Fund’s NAV (discount). An investor may incur costs attributable to the difference between the highest price a buyer is willing to pay to purchase shares (bid) and the lowest price a seller is willing to accept for shares (ask) when buying or selling Fund shares in the secondary market (the “bid-ask spread”). Recent information, including information regarding the Fund’s NAV, market price, premiums and discounts, and bid-ask spread, is available at harborcapital.com.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Harbor Energy Transition Strategy ETF

Fund Summary

Investment Objective

The Fund seeks to provide investment results that correspond, before fees and expenses, to the performance of the Quantix Energy Transition index (the “Index”).

Fees and Expenses of the Fund

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

	Rate
Management Fees	0.80%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses1,2	0.00%
Total Annual Fund Operating Expenses	0.80%

2 Based on estimated amounts for the current fiscal year.

Expense Example

	One Year	Three Years
Cost	$82	$255

Portfolio Turnover

Principal Investment Strategy

The Fund seeks to provide investment results that correspond, before fees and expenses, to the performance of the Index, which was developed by Quantix Commodities Indices LLC (“QCI” or the “Index Provider”), an affiliate of Quantix Commodities LP, the Fund’s subadvisor (“Quantix” or the “Subadvisor”). The Index is composed of futures contracts on physical commodities associated with the accelerating transition from carbon-intensive energy sources, such as petroleum, crude oil and thermal coal, to less carbon-intensive sources of energy, such as natural gas, ethanol, wind power, and solar power. The Index is constructed using QCI’s proprietary quantitative methodology, as described below.

Under normal market conditions, the Index contains at least 10 commodity futures traded on exchanges in the United States (U.S.), Canada, United Kingdom (U.K.) and other European exchanges, determined based upon liquidity and ability to be traded in a cost-efficient manner, as determined by the Index Provider. A commodity futures contract is a legal agreement to buy or sell a particular commodity (for example, metals or agricultural products) at a predetermined price at a specified time in the future. Commodity futures that provide exposure to the energy transition theme are considered component candidates for inclusion in the Index. The commodities that comprise the Index serve one of the three purposes associated with the theme: (1) they are used to construct the new energy infrastructure (for example, copper, aluminum, and silver); (2) they are “bridge fuels” that are less carbon-intensive and will provide energy between now and the net-zero state (for example, natural gas); or (3) they incentivize investment in the new energy infrastructure (for example, carbon credits).

As of the date of this Prospectus, the following commodity futures are eligible for inclusion in the Index: copper, aluminum, nickel, zinc, lead, natural gas (U.S.), natural gas (U.K.), natural gas (Europe), silver, palladium, platinum, soybean oil, ethanol, emissions – European Union Allowances (EUA), and emissions - California Carbon Allowances (CCA).

Commodity futures from the component candidates are selected for the Index and weighted based on the Index Provider’s quantitative methodology, which involves two steps:

Step 1: For each eligible commodity contract, the Index Provider calculates the economic significance weight, or economic importance within the overall universe, based upon level of trading. Specifically, economic significance weight is calculated using a rolling average of the open interest (i.e., the total number of outstanding contracts that have not been settled) in each futures contract relative to the sum of the open interest of the eligible universe, based on information published by the applicable futures exchanges.

Step 2: The Index Provider applies maximum sector weights and maximum and minimum commodity weights to ensure diversification within the Index.

The Index includes provisions for rolling futures contracts as they approach maturity based on a predetermined schedule. “Rolling” means selling a futures contract as it nears its expiration date and replacing it with a new futures contract that has a later expiration date. If the price for the new futures contract is lower than the price of the expiring contract, then the market for the commodity is said to be in “backwardation.” In these markets, roll returns are positive. The term “contango” is used to describe a market in which the price for a new futures contract is higher than the price of the expiring contract. In these markets, roll returns are negative. The Index may include foreign currency denominated

Fund Summary
Harbor Energy Transition Strategy ETF

commodity futures contracts. Because the Index is not designed to generate returns from changes in foreign exchange rates, the Index methodology provides for the conversion of futures prices from local currencies into U.S. dollars and hedging the local currency exposure into U.S. dollars.

The Index is calculated on a “total return” basis, meaning that the returns of the futures contracts included in the Index are combined with the returns on cash collateral invested in 13-week U.S. Treasury Bills. Under normal circumstances, the Index is reconstituted monthly. QCI, as provider of the Index, is responsible for Index construction. The Index has been licensed to the Advisor by QCI and is calculated, published and distributed by Solactive AG (“Solactive”), the Index calculation agent. The Subadvisor is responsible for the day-to-day management of the Fund’s assets in accordance with the Fund’s investment objective, subject to the oversight of Harbor Capital Advisors, Inc. (“Harbor Capital” or the “Advisor”).

The Fund seeks to achieve its investment objective primarily by investing, through its Subsidiary (as defined below), in one or more excess return swaps on the Index. Excess return swaps are derivative contracts between two parties who exchange the return from a financial asset between them. The Fund will make payments to a swap dealer counterparty based on a set rate in exchange for payments based on the returns of the futures contracts comprising the Index. If the returns on those futures contracts are positive, the counterparty will pay the Fund; in the event that the returns are negative, the Fund will make payments to the counterparty. The swaps may be terminated by the Subadvisor at any time. The Fund also holds U.S. Treasury securities, cash and/or money market funds, which may be used as collateral for the Fund’s derivatives holdings or to generate interest income and capital appreciation on the cash balances arising from its use of derivatives (thereby providing a “total return” investment in the underlying commodity futures contracts). Under normal circumstances, the Fund invests (directly or through its Subsidiary) at least 80% of its net assets, plus borrowings for investment purposes, in financial instruments and short-term investments that taken together are designed to provide investment results that correspond, before fees and expenses, to the performance of the Index.

Although the Index applies certain maximum sector and commodity weights, a significant portion of the Index may consist of a particular sector or commodity. In such instances, the Fund is expected to have significant exposure to that sector or commodity. As of the date of this Prospectus, a significant portion of the Index consists of, and therefore the Fund has significant exposure to, the base metals and natural gas sectors. Base metals, such as copper, aluminum, zinc, and lead, are common metals used in industry or manufacturing excluding iron-containing metals and alloys or precious metals, such as gold or silver.

the same general investment policies and restrictions as the Fund. Unlike the Fund, the Subsidiary may invest without limitation in commodity-linked derivative instruments. The Subsidiary’s investment in derivative instruments, including excess return swaps, may have a leveraging effect on the Fund because of the leverage inherent in the use of derivatives. Except as noted, references to the Fund’s investment strategies and risks include those of its Subsidiary. The Subsidiary is advised by the Advisor and subadvised by the Subadvisor.

The Fund is classified as non-diversified, which means the Fund may invest in the securities of a smaller number of issuers than a diversified fund.

Principal Risks

Fund Summary
Harbor Energy Transition Strategy ETF

respectively, which may have an adverse impact on the Fund and its shareholders. There is no guarantee that the construction methodology will accurately provide the intended exposure. The Index methodology may result in omission of commodities that are otherwise relevant to the energy transition theme because such commodities do not have futures markets or have futures markets that are illiquid. In addition, the supply and demand dynamics of commodities included in the Index may be influenced by various factors unrelated to the Index’s energy transition theme.

Index Tracking Risk: The Fund is not expected to track the performance of the Index at all times with perfect accuracy. The Fund’s return may not track the performance of the Index for a number of reasons. For example, tracking error may occur because of differences between the securities and other financial instruments held in the Fund’s portfolio and those included in the 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, or the Fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of dividends or interest. Any transaction costs and market exposure arising from rebalancing the Fund’s portfolio to reflect changes in the composition of the Index will be borne directly by the Fund and its shareholders. The Fund may not be able to invest in certain securities included in the Index or may not be able to invest in them in the exact proportions in which they are represented in the Index, due to legal restrictions, potential adverse tax consequences or other regulatory reasons. The risk that the Fund may not track the performance of the Index may be magnified during times of heightened market volatility or other unusual market conditions. For tax efficiency purposes, the Fund may sell certain securities to realize losses causing it to deviate from the Index.

agency basis (i.e., on behalf of other market participants), which only a limited number of APs may be able to do. In addition, to the extent that APs exit the business or are unable to proceed with creation and/or redemption orders with respect to the Fund and no other AP is able to step forward to create or redeem Creation Units (as defined below), this may result in a significantly diminished trading market for shares, and shares may be more likely to trade at a premium or discount to the Fund’s net asset value and to face trading halts and/or delisting. This risk may be heightened during periods of volatility or market disruptions.

Energy Transition Risk: The commodities included in the Index may become less representative of energy transition trends over time depending upon industry trends, global market conditions, demand constraints, and technological advancements in energy production and renewable energy sources. The Fund’s investments may be significantly impacted by government and corporate policies related to the use of renewable energy technologies, such as electric vehicles, and power sources, such as solar, wind and hydrogen. These investments may also be negatively impacted by the policies and practices of governments, intergovernmental organizations, or corporations that promote or benefit fossil-based systems of energy production; reduced availability of renewable energy sources; slowdowns in new construction; seasonal weather conditions, extreme weather or other natural disasters; and threats of attack by terrorists on renewable energy assets.

Base Metals Risk: The price of base metals, such as copper, aluminum, nickel, zinc, and lead, can be impacted by overall market movements, changes in interest rates, energy and commodity prices, the global supply and demand for metals, factors that impact metal production, technological advances in the processing and mining of metals, and changes in economic and/or political conditions that may impact the price of metals and metals futures contracts.

Fund Summary
Harbor Energy Transition Strategy ETF

needed to distribute redemption proceeds. A sale of portfolio securities may result in capital gains or losses and may also result in higher brokerage costs. To the extent costs are not offset by transaction fees charged by the Fund to APs, the costs of cash transactions will be borne by the Fund.

Counterparty Risk: A counterparty may be unwilling or unable to meet its contractual obligations. If the counterparty or its affiliate becomes insolvent, bankrupt or defaults ion its payment obligations to the Fund, the value of an investment held by the Fund may decline. The Fund may also not be able to exercise remedies, such as the termination of transactions, netting of obligations and realization on collateral if such remedies are stayed or eliminated under special resolutions adopted in the United States or other jurisdictions.

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 contract falling below zero for a period of time.

Emissions-Related Credits Risk: The Fund’s performance may be more volatile as a result of its investments in emissions-related credits. Emissions-related credit prices may be affected by any number of factors, including, among others: technology; climate change, natural disasters and other catastrophes; changes in exchange rates; global political changes, and government regulations.

Foreign Currency Risk: Because the Index may include futures contracts denominated in foreign currencies, the Fund could be subject to currency risk. Currency risk is the risk that foreign currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency hedged. In either event, the dollar value of an investment in the Fund would be adversely affected. Although the Index methodology provides for hedging of foreign currency exposure, there is no guarantee that such hedging will be successful.

Geopolitical Risk: Geopolitical events may disrupt securities and commodity markets and adversely affect global economies. War, terrorism, sanctions, and related geopolitical events have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on U.S. and world economies and markets generally. Recent geopolitical events have led and are expected to continue to lead to instability in certain of the markets in which the Fund invests. During global market disruptions, the Fund’s exposure to the other risks described in this Prospectus will likely increase. Market disruptions can also prevent the Fund from implementing its investment strategies for a period of time and achieving its investment objective. For example, a market disruption may adversely affect the orderly functioning of the securities or commodity markets and may cause the Fund’s derivatives counterparties to discontinue offering derivatives on some underlying securities, reference rates, or indices, or to offer them on a more limited basis.

Fund Summary
Harbor Energy Transition Strategy ETF

New Index Risk: The Index was created by and is owned and maintained by the Index Provider, and it has not previously been utilized for a registered fund, which may create additional risks for investing in the Fund. There can be no guarantee that the Index will operate as intended during volatile market conditions or over the course of a full market cycle.

Performance

Portfolio Management

Investment Advisor

Harbor Capital Advisors, Inc.

Subadvisor

Quantix Commodities LP (“Quantix”) has subadvised the Fund since 2022.

Portfolio Manager

The portfolio manager is responsible for the day-to-day investment decision making for the Fund.

Matthew Schwab

Quantix Commodities LP

Mr. Schwab is a Portfolio Manager at Quantix and has served as a portfolio manager for the Fund since February 2022.

Fund Summary
Harbor Energy Transition Strategy ETF

Buying and Selling Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Harbor Health Care ETF

Fund Summary

Investment Objective

The Fund seeks long-term growth of capital.

Fees and Expenses of the Fund

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

	Rate
Management Fees	0.80%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses1,2	0.00%
Total Annual Fund Operating Expenses	0.80%

2 Based on estimated amounts for the current fiscal year.

Expense Example

	One Year	Three Years
Cost	$82	$255

Portfolio Turnover

Principal Investment Strategy

The Fund invests primarily in equity securities, principally common and preferred stocks of companies of any market capitalization. Under normal market conditions, the Fund invests at least 80% of its net assets, plus borrowings for investment purposes, in securities of companies principally engaged in the research, development, production, or distribution of products and services related to the health care industry (“health care companies”). Health care companies may include, for example, manufacturers of health care equipment and supplies, health care services providers, pharmaceutical companies, biotechnology and life sciences companies, and suppliers of technologies for use by health care companies. The Fund may invest in issuers of all market capitalizations, including larger, established issuers and newer companies with little or no current revenues. The Fund may invest in foreign securities (including through investment in depositary receipts), with such investments typically representing less than 35% of the Fund’s net assets.

Westfield Capital Management, Company, L.P. (“Westfield” or the “Subadvisor”), the Fund’s subadvisor, uses a bottom-up process to identify primarily U.S. listed health care companies that meet the Subadvisor’s strict fundamental criteria and then performs a qualitative review on each identified company to select approximately 30 to 50 companies for inclusion in the Fund’s portfolio. The Subadvisor considers a number of factors in the course of its fundamental research, including but not limited to valuation, competitive advantage, market opportunity, financial metrics, capital structure, and management track record of execution. The Subadvisor’s research may include personal interviews and other contact with company management.

In constructing the Fund’s portfolio, the Subadvisor seeks to identify health care companies that it believes possess the following characteristics:

◾

Superior company management;

◾

Significant insider ownership;

◾

Unique market positions and broad market opportunities; and

◾

Solid financial controls and accounting processes.

The Subadvisor may sell a security if the security reaches or falls below a predetermined price target, a change in the company’s fundamentals negatively impacts the Subadvisor’s original investment thesis, or the Subadvisor identifies what it believes to be a more attractive investment opportunity.

The Fund is classified as non-diversified, which means the Fund may invest in the securities of a smaller number of issuers than a diversified fund.

The Fund concentrates its investments (i.e., holds more than 25% of its total assets) in the securities of issuers in the health care industry or group of industries.

Fund Summary
Harbor Health Care ETF

Principal Risks

Health Care Industry Risk: Because the Fund seeks to invest all, or substantially all, of its assets in the health care industry, the value of its shares will depend on the general condition of the that industry. The health care industry may be affected by any number of factors, including, but not limited to, lapsing patent protection, industry innovation, extensive government regulation, restrictions on government reimbursement for medical expenses, research and development costs, limited product lines, product liability litigation, an increased emphasis on outpatient services, and competitive forces.

have no obligation to submit creation or redemption orders. Consequently, there is no assurance that APs will establish or maintain an active trading market for the shares. This risk may be heightened to the extent that securities held by the Fund are traded outside a collateralized settlement system. In that case, APs may be required to post collateral on certain trades on an agency basis (i.e., on behalf of other market participants), which only a limited number of APs may be able to do. In addition, to the extent that APs exit the business or are unable to proceed with creation and/or redemption orders with respect to the Fund and no other AP is able to step forward to create or redeem Creation Units (as defined below), this may result in a significantly diminished trading market for shares, and shares may be more likely to trade at a premium or discount to the Fund’s net asset value and to face trading halts and/or delisting. This risk may be heightened during periods of volatility or market disruptions.

Fund Summary
Harbor Health Care ETF

Performance

Portfolio Management

Investment Advisor

Harbor Capital Advisors, Inc.

Subadvisor

Westfield has subadvised the Fund since 2022.

Portfolio Managers

The portfolio managers are jointly and primarily responsible for the day-to-day investment decision making for the Fund.

William A. Muggia

Westfield Capital Management Company, L.P.

Mr. Muggia is the President, Chief Investment Officer, Chief Executive Officer, a Portfolio Manager and Managing Partner of Westfield and has co-managed the Fund since 2022.

Matthew R. Renna

Westfield Capital Management Company, L.P.

Mr. Renna is a Partner, Head of the Health Care Sector Team, and a Portfolio Manager of Westfield and has co-managed the Fund since 2022.

Buying and Selling Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Harbor International Compounders ETF

Fund Summary

Investment Objective

The Fund seeks long-term growth of capital.

Fees and Expenses of the Fund

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

	Rate
Management Fees	0.55%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses1,2	0.00%
Total Annual Fund Operating Expenses	0.55%

2 Based on estimated amounts for the current fiscal year.

Expense Example

	One Year	Three Years
Cost	$56	$176

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Expense Example, do affect the Fund’s performance. For the period from September 7, 2022 through October 31, 2022, the Fund’s portfolio turnover rate was 1%. Portfolio turnover rate excludes investments received or delivered from in-kind processing of creation unit purchases or redemptions.

Principal Investment Strategy

The Fund invests primarily in equity securities of non-U.S. companies, including those located in emerging market countries. The Fund invests principally in the common stock of companies with market capitalizations of at least $5 billion at the time of acquisition that are identified as “compounders” by C WorldWide Asset Management Fondsmaeglerselskab A/S, the Fund’s subadvisor (the “Subadvisor”). A company is considered a “compounder” if, in the Subadvisor’s view, it is expected to experience sustainable growth and compound its earnings over the long-term (generally five years or more).

In seeking to identify companies for the Fund’s portfolio, the Subadvisor conducts qualitative assessments of companies, including, among other criteria, each company’s business model, management, and financial and valuation metrics. The Subadvisor seeks to identify what it believes to be high-quality companies with consistent, recurring revenues, stable free cash flows and sustainable returns on invested capital. The Subadvisor aims to construct a portfolio of companies exposed to diverse structural growth themes. The investment process generally results in a portfolio of 25-30 companies and, from time to time, may result in more substantial investments in particular countries, regions or sectors. Country, region and sector allocations are the outcome of the Subadvisor’s stock selection process.

The Subadvisor’s assessment of a company’s business practices includes a consideration of environmental, social and governance (“ESG”) factors. In incorporating ESG factors into its investment process, the Subadvisor seeks to identify sustainable growth companies that follow good business practices. In the Subadvisor’s view, these are companies with strong corporate governance practices and ethics, laying the foundation for a sustainable business model. The Subadvisor’s assessment is based on its internal research as well as third-party data. The key ESG considerations may vary depending on the industry, sector, geographic region or other factors and the business of each issuer.

The Subadvisor’s approach to portfolio selection is based on fundamental research informed by visiting companies, participating in investment workshops and seminars, generating proprietary research and reviewing third-party research. The Subadvisor’s fundamental evaluation of stocks is dependent on a combination of factors, including risk return considerations, market sentiment and economic data.

The Fund may also invest in depositary receipts. The Fund may invest in foreign currencies and may engage in other foreign currency transactions for investment or hedging purposes.

The Fund is classified as non-diversified, which means the Fund may invest in the securities of a smaller number of issuers than a diversified fund.

The Subadvisor maintains a long-term investment horizon. The Subadvisor monitors investments for changes in the factors above, which may trigger a decision to sell a security, but does not require such a decision. The Subadvisor also may consider selling a security if the Subadvisor develops alternative investment ideas or in order to meet redemption requests.

Fund Summary
Harbor International Compounders ETF

Principal Risks

individually or in the aggregate at any point in time. This may result in the Fund’s shares trading significantly above (premium) or below (discount) the Fund’s net asset value, which will be reflected in the intraday bid/ask spreads and/or the closing price of shares as compared to net asst value. However, given that shares can be purchased and redeemed in Creation Units , and only to and from broker-dealers and large institutional investors that have entered into participation agreements (unlike shares of closed-end funds, which frequently trade at appreciable discounts from, and sometimes at premiums to, their net asset value), the Advisor believes that large discounts or premiums to the net asset value of shares should not be sustained. During stressed market conditions, the market for the Fund’s shares may become less liquid in response to deteriorating liquidity in the market for the Fund’s underlying portfolio holdings, which could in turn lead to differences between the market price of the Fund’s shares and their net asset value.

Fund Summary
Harbor International Compounders ETF

emerging market securities more volatile and less liquid than securities issued in more developed countries. Each applicable Subadvisor generally considers an instrument to be economically tied to an emerging market country if: the issuer is organized under the laws of an emerging market country; the currency of settlement of the security is a currency of an emerging market country; the security is guaranteed by the government of an emerging market country (or any political subdivision, agency, authority or instrumentality of such government); for an asset-backed or other collateralized security, the country in which the collateral backing the security is located is an emerging market country; or the security’s “country of exposure” is an emerging market country, as determined by the criteria set forth below. With respect to derivative instruments, the Subadvisor generally considers such instruments to be economically tied to emerging market countries if the underlying assets are currencies of emerging market countries (or baskets or indexes of such currencies), or instruments or securities that are issued or guaranteed by governments of emerging market countries or by entities organized under the laws of emerging market countries or if an instrument’s “country of exposure” is an emerging market country. A security’s “country of exposure” is determined by the Subadvisor using certain factors provided by a third-party analytical service provider. The Advisor and/or Subadvisor have broad discretion to identify countries that it considers to qualify as emerging markets. Emerging market countries are generally located in Asia, Africa, the Middle East, Latin America and Eastern Europe. Securities exchanges in emerging markets may suspend listed securities from trading for substantially longer periods of time than exchanges in developed markets, including for periods of a year or longer. If the Fund is holding a suspended security, that security would become completely illiquid as the Fund would not be able to dispose of the security until the suspension is lifted. In such instances, it can also be difficult to determine an appropriate valuation for the security because of a lack of trading and uncertainty as to when trading may resume.

ESG Factors Risk: The consideration of ESG factors by the Subadvisor and/or Advisor, as applicable, could cause the Fund to perform differently than other funds. ESG factors are not the only consideration used by the Subadvisor and/or Advisor, as applicable, in making investment decisions for the Fund and the Fund may invest in a company that scores poorly on ESG factors if it scores well on other criteria. ESG factors may not be considered for every investment decision.

Geographic Focus Risk: The Fund may invest a substantial amount of its assets in securities of issuers located in a single country or geographic region. As a result, any changes to the regulatory, political, social or economic conditions in such country or geographic region will generally have greater impact on the Fund than such changes would have on a more geographically diversified fund and may result in increased volatility and greater losses.

New Fund Risk: There can be no assurance that the Fund will grow to or maintain an economically viable size, in which case

the Board of Trustees may determine to liquidate the Fund. The Board of Trustees may liquidate the Fund at any time in accordance with the Declaration of Trust and governing law. As a result, the timing of the Fund’s liquidation may not be favorable.

Participatory Notes Risk: The return on a P-note is linked to the performance of the issuers of the underlying securities. The performance of P-notes will not replicate exactly the performance of the issuers that they seek to replicate due to transaction costs and other expenses. P-notes are subject to counterparty risk since the notes constitute general unsecured contractual obligations of the financial institutions issuing the notes, and the Fund is relying on the creditworthiness of such institutions and has no rights under the notes against the issuers of the underlying securities. P-notes may also be less liquid and more difficult to sell.

Performance

Fund Summary
Harbor International Compounders ETF

Portfolio Management

Investment Advisor

Harbor Capital Advisors, Inc.

Subadvisor

C WorldWide Asset Management Fondsmaeglerselskab A/S (“C WorldWide”) has subadvised the Fund since 2022.

Portfolio Managers

The portfolio managers are jointly and primarily responsible for the day-to-day investment decision making for the Fund.

Bo Almar Knudsen

C WorldWide Asset Management

Fondsmaeglerselskab A/S

Mr. Knudsen is the Chief Executive Officer and Portfolio Manager of C WorldWide and has co-managed the Fund since 2022.

Bengt Seger

C WorldWide Asset Management

Fondsmaeglerselskab A/S

Mr. Seger is a Portfolio Manager of C WorldWide and has co-managed the Fund since 2022.

Peter O’Reilly

C WorldWide Asset Management

Fondsmaeglerselskab A/S

Mr. O’Reilly is a Portfolio Manager of C WorldWide and has co-managed the Fund since 2022.

Mattias Kolm

C WorldWide Asset Management

Fondsmaeglerselskab A/S

Mr. Kolm is a Portfolio Manager of C WorldWide and has co-managed the Fund since 2022.

Buying and Selling Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Harbor Long-Term Growers ETF

Fund Summary

Investment Objective

The Fund seeks long-term growth of capital.

Fees and Expenses of the Fund

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

	Rate
Management Fees	0.57%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses1	0.00%
Total Annual Fund Operating Expenses	0.57%

Expense Example

	One Year	Three Years	Five Years	Ten Years
Cost	$58	$183	$318	$714

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Expense Example, do affect the Fund’s performance. For the period from February 2, 2022 through October 31, 2022, the Fund’s portfolio turnover rate was 24%. Portfolio turnover rate excludes investments received or delivered from in-kind processing of creation unit purchases or redemptions.

Principal Investment Strategy

The Fund invests primarily in equity securities, principally common and preferred stocks, of U.S. companies that the Subadvisor believes to have above-average prospects for long-term growth. The Fund is “non-diversified,” meaning that a relatively high percentage of its assets may be invested in a limited number of issuers.

The Subadvisor selects investments for the Fund using a proprietary combination of bottom-up, fundamental research and systematic portfolio construction, in order to build a portfolio of high-conviction stocks reflecting the views of the Subadvisor.

The Subadvisor’s fundamental, bottom-up research seeks to identify mid- and large-capitalization companies it believes will have magnitude and duration of growth that is above that of the public equity market, as determined by the Subadvisor. The research includes visits to companies and discussion with company management.

These companies typically possess a combination of the following characteristics:

◾

Market-leading position in core business areas;

◾

Disruptive business model;

◾

Expected above average revenue, earnings, and cash flow growth over the next several years;

◾

Strong cash flow generation and reinvestment;

◾

Balance sheet strength;

◾

Experienced management team, able to execute on the business opportunity; and

◾

Appropriate valuations relative to the company’s long-term growth potential.

The Subadvisor then employs a systematic portfolio construction process that seeks to manage overall investment risk exposures and characteristics in order to maintain consistency with the Fund’s objective. The Subadvisor uses a portfolio optimization process designed to incorporate the Subadvisor’s fundamental growth insights, considering diversification and liquidity risk.

As part of its investment process, the Subadviser considers environmental, social and governance (“ESG”) factors that it believes may have a material impact on an issuer and the value of its securities. As a result, the key ESG considerations may vary depending on the industry, sector, geographic region or other factors and the core business of each issuer.

The Fund may invest up to 20% of its total assets in the securities of foreign issuers, including issuers located or doing business in emerging markets.

Fund Summary
Harbor Long-Term Growers ETF

Principal Risks

Growth Style Risk: Over time, a growth oriented investing style may go in and out of favor, which may cause the Fund to underperform other equity funds that use different investing styles.

Large Cap Risk: Large cap stocks may fall out of favor relative to small or mid cap stocks, which may cause the Fund to underperform other equity funds that focus on small or mid cap stocks.

Fund Summary
Harbor Long-Term Growers ETF

Mid Cap Risk: The Fund’s performance may be more volatile because it invests primarily in mid cap stocks. Mid cap companies may have limited product lines, markets and financial resources. Securities of mid cap companies are usually less stable in price and less liquid than those of larger, more established companies. Additionally, mid cap stocks may fall out of favor relative to small or large cap stocks, which may cause the Fund to underperform other equity funds that focus on small or large cap stocks.

Performance

Portfolio Management

Investment Advisor

Harbor Capital Advisors, Inc.

Subadvisor

Jennison Associates LLC (“Jennison”) has subadvised the Fund since 2022.

Portfolio Managers

The portfolio managers are jointly and primarily responsible for the day-to-day investment decision making for the Fund.

Blair A. Boyer

Jennison Associates LLC

Mr. Boyer is a Managing Director and the Co-Head of Large Cap Growth Equity of Jennison and has co-managed the Fund since 2022.

Natasha Kuhlkin, CFA

Jennison Associates LLC

Ms. Kuhlkin is a Managing Director and a Large Cap Growth Equity Portfolio Manager of Jennison and has co-managed the Fund since 2022.

Kathleen A. McCarragher

Jennison Associates LLC

Ms. McCarragher is a Director, Managing Director and the Head of Growth Equity of Jennison and has co-managed the Fund since 2022.

Jason T. McManus

Jennison Associates LLC

Mr. McManus is a Managing Director and the Head of Custom Solutions of Jennison and has co-managed the Fund since 2022.

Fund Summary
Harbor Long-Term Growers ETF

Buying and Selling Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Harbor Scientific Alpha High-Yield ETF

Fund Summary

Investment Objective

The Fund seeks total return.

Fees and Expenses of the Fund

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

	Rate
Management Fees	0.48%
Distribution and Service (12b-1) Fees	None
Other Expenses1	0.00%
Total Annual Fund Operating Expenses	0.48%

Expense Example

	One Year	Three Years	Five Years	Ten Years
Cost	$49	$154	$269	$604

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Expense Example, do affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 114%. Portfolio turnover rate excludes investments received or delivered from in-kind processing of creation unit purchases or redemptions.

Principal Investment Strategy

Under normal market conditions, the Fund invests at least 80% of its net assets, plus borrowings for investment purposes, in a portfolio of below investment-grade corporate bonds, commonly referred to as “high yield” or “junk” bonds, or unrated securities that BlueCove Limited (the “Subadvisor”) considers to be of an equivalent credit quality, which may be represented by derivative instruments, including futures and swaps. The Subadvisor determines whether a bond is rated below investment grade using a composite rating calculated by assigning a numerical value to those ratings of Moody’s, S&P and Fitch which are available for the bond and averaging those amounts to determine the rating. The Fund invests primarily in U.S. dollar denominated securities, including those of foreign issuers. Derivative instruments in which the Fund may invest include credit-default swaps and U.S. Treasury futures. The Fund may also invest in exchange-traded funds to manage aggregate portfolio exposures.

The Subadvisor defines scientific alpha as the investment returns generated from following a structured investment process based on the testing of investment hypotheses using historical data. The Subadvisor’s portfolio management team retains discretion with respect to all investment decisions.

The Subadvisor’s investment process utilizes proprietary quantitative models to produce investment recommendations. The Subadvisor generates proprietary insights based on its experience and reasoned intuition to form an investment hypothesis. Using historical market data, the Subadvisor back-tests each investment hypothesis to determine whether actual observations appear consistent with the hypothesis over time. The Subadvisor’s back-testing process involves the development of research parameters, internal peer review, and consideration of a wide range of analyses. Insights are weighted in the Subadvisor’s models according to their deemed strength in predicting returns, as determined by the Subadvisor through this testing process. In managing the Fund, the Subadvisor will rely on insights that seek to target idiosyncratic company and security specific risk, which form the basis of security selection decisions and assess metrics such as company strength, company outlook, and credit spreads. In addition, the Fund will rely on the Subadvisor’s market timing insights which the Subadvisor uses to form a view on the attractiveness of credit and interest rate markets and assess metrics such as market expectations for growth and credit default rates. The Subadvisor’s models consider data from multiple sources, including issuer-specific and macroeconomic information such as company cash flow, default risk, and earnings expectations.

The Subadvisor expects that the majority of the Fund’s total returns will be generated from security selection of high yield bonds. Positions are sized based on an optimization which aims to effectively translate the insights gleaned from the Subadvisor’s proprietary models into portfolio positions. The Subadvisor’s optimization process seeks to maximize total returns while minimizing expected risk and transaction costs. The Subadvisor measures risk at the portfolio level and on each instrument. Furthermore, concentration risk is minimized by capping exposures based on internal limits for single issuer and single issue positions. The Subadvisor conducts performance measurement and risk analysis to seek to validate the accuracy of the investment process with the aim of achieving continuous improvement over time. The Subadvisor may engage in frequent trading in the Fund to achieve its principal investment strategies.

Duration/Maturity: Although duration may be one of the characteristics considered in security selection, the Fund does

Fund Summary
Harbor Scientific Alpha High-Yield ETF

not focus on bonds with any particular duration or maturity and does not seek to maintain the maturity of the Fund’s portfolio in any particular range. The Fund has not commenced operations as of the date of this Prospectus and therefore, the weighted average maturity of the Fund’s portfolio is not available.

Credit Quality: The Fund invests primarily in below investment-grade debt securities, commonly referred to as “high yield” or “junk” bonds, but may invest in other fixed income instruments. As such, the Fund’s weighted average portfolio quality varies from time to time, depending on the level of assets allocated to such securities. The Subadvisor does not seek to actively invest in defaulted securities.

Principal Risks

There is no guarantee that the investment objective of the Fund will be achieved. Fixed income securities fluctuate in price in response to various factors, including changes in interest rates, changes in market conditions and issuer-specific events, and the value of your investment in the Fund may go down. This means that you could lose money on your investment in the Fund or the Fund may not perform as well as other possible investments. Principal risks impacting the Fund (in alphabetical order after the first six risks) include:

High-Yield Risk: There is a greater risk that the Fund will lose money because it invests primarily in below investment-grade fixed income securities and unrated securities of similar credit quality (commonly referred to as “high-yield” or “junk” bonds). These securities are considered speculative because they have a higher risk of issuer default, are subject to greater price volatility and may be illiquid.

Model Risk: There are limitations inherent in every quantitative model. The value of securities selected using quantitative analysis can react differently to issuer, political, market, and economic developments than the market as a whole or securities selected using only fundamental analysis. The factors used in quantitative analysis and the weight placed on those factors may not be predictive of a security’s value. In addition, historical trends in data may not be predictive going forward. The strategies and techniques employed in a quantitative model cannot fully match the complexity of the financial markets and therefore sudden unanticipated changes in underlying market conditions can significantly impact their performance. The effectiveness of the given strategy or technique may deteriorate in an unpredictable fashion for any number of reasons including, but not limited to, an increase in the amount of assets managed or the use of similar strategies or techniques by other market participants and/or market dynamic shifts over time. In addition, factors that affect a security’s value can change over time, and these changes may not be reflected in the quantitative model. Any model may contain flaws the existence and effect of which may be discovered only after the fact or not at all. There can be no assurances that the strategies pursued or the techniques implemented in the quantitative model will be profitable, and various market conditions may be materially less favorable to certain strategies than others. Even in the absence of flaws, a model may not perform as anticipated.

Inflation Risk: As inflation rises, the value of assets of or income, from the Fund’s investments may be worth less, as inflation decreases the value of payments at future dates. As a result, the real value of the Fund’s portfolio could decline.

Credit Risk: The issuer or guarantor of a security owned by the Fund could default on its obligation to pay principal or interest

Fund Summary
Harbor Scientific Alpha High-Yield ETF

or its credit rating could be downgraded. Likewise, a counterparty to a derivative or other contractual instrument owned by the Fund could default on its obligation. This risk may be higher for below investment-grade securities.

Derivatives Risk: The value of derivative instruments held by the Fund may not change in the manner expected by the Subadvisor and/or Advisor, as applicable, which could result in disproportionately large losses to the Fund. Derivatives may also be more volatile than other instruments and may create a risk of loss greater than the amount invested. In addition, certain derivatives may be difficult to value and may be illiquid.

ETF Risk: The Fund’s investment in shares of ETFs subjects it to the risks of owning the securities underlying the ETF, as well as the same structural risks faced by an investor purchasing shares of the Fund, including premium/discount risk and trading issues risk. As a shareholder in another ETF, the Fund bears its proportionate share of the ETF’s expenses, subjecting Fund shareholders to duplicative expenses.

Extension Risk: When interest rates are rising, certain callable fixed income securities may be extended because of slower than expected principal payments. This would lock in a below-market interest rate, increase the security’s duration and reduce the value of the security.

High Portfolio Turnover Risk: Higher portfolio turnover may adversely affect Fund performance by increasing Fund transaction costs and may lead to the realization and distribution to shareholders of higher capital gains, which may increase a shareholder’s tax liability.

Liquidity Risk: A particular investment may be difficult to purchase or sell and the Fund may be unable to sell illiquid securities at an advantageous time or price or achieve its desired level of exposure to a certain sector. Liquidity risk may result from the lack of an active market, reduced number and capacity of traditional market participants to make a market in fixed income securities, and may be magnified in a rising interest rate environment or other circumstances where investor redemptions from fixed income mutual funds may be higher than normal, causing increased supply in the market due to selling activity. Valuation of investments may be difficult, particularly during periods of market volatility or reduced liquidity and for investments that trade infrequently or irregularly. In these circumstances, among others, an investment may be valued using fair value methodologies that are inherently subjective and reflect good faith judgments based on available information.

Prepayment Risk: When interest rates are declining, the issuer of a fixed income security, including a pass-through security such as a mortgage-backed or an asset-backed security, may exercise its option to prepay principal earlier than scheduled, forcing the Fund to reinvest in lower yielding securities.

U.S. Government Securities Risk: Securities issued or guaranteed by U.S. government agencies or government-sponsored entities may not be backed by the full faith and credit of the U.S. government. As a result, no assurance can be given that the U.S. government will provide financial support to these securities or issuers (such as securities issued by the Federal National Mortgage Association, or the Federal Home Loan Mortgage Corporation). Although certain government securities are backed by the full faith and credit of the U.S. government (such as securities issued by the Government National Mortgage Association), circumstances could arise that would delay or prevent the payment of interest or principal. It is possible that issuers of U.S. government securities will not have the funds to meet their payment obligations in the future and, in these circumstances, the Fund’s returns may be adversely affected.

Fund Summary
Harbor Scientific Alpha High-Yield ETF

Performance

The following bar chart and tables are intended to help you understand the risks and potential rewards of investing in the Fund. The bar chart shows the performance of the Fund for the period shown. The table shows how the Fund’s average annual total returns compared to the returns of the Fund’s benchmark index, which includes securities with investment characteristics similar to those held by the Fund. Please note that the Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. To obtain updated performance information please visit the Fund’s website at harborcapital.com or call 800-422-1050.

Calendar Year Total Returns

During the time periods shown in the bar chart, the Fund’s highest and lowest returns for a calendar quarter were:

	Total Returns	Quarter/Year
Best Quarter	5.32%	Q4 2022
Worst Quarter	-8.48%	Q2 2022

Average Annual Total Returns — As of December 31, 2022

	One Year	Annualized			Inception Date
	One Year	Five Years	Ten Years	Since Inception	Inception Date
Harbor Scientific Alpha High-Yield ETF
Before Taxes	-7.89%	N/A	N/A	-6.12%	9/14/2021
After Taxes on Distributions	-10.16%	N/A	N/A	-8.28%
After Taxes on Distributions and Sale of Fund Shares	-4.67%	N/A	N/A	-5.52%
Comparative Index (reflects no deduction for fees, expenses or taxes)
ICE BofA U.S. High Yield (H0A0)	-11.22%	N/A	N/A	-8.59%

Portfolio Management

Investment Advisor

Harbor Capital Advisors, Inc.

Subadvisor

BlueCove Limited (“BlueCove”) has subadvised the Fund since 2021.

Portfolio Managers

BlueCove employs a team approach in which a number of portfolio management individuals will be involved in the day-to-day investment decision making of the Fund. Mr. Brodsky, Mr. Harper, Mr. Thomas and Mr. Flannery are jointly responsible for managing the Fund.

Benjamin Brodsky, CFA

BlueCove Limited

Mr. Brodsky is Chief Investment Officer of BlueCove and has managed the Fund since 2021.

Michael Harper, CFA

BlueCove Limited

Mr. Harper is Head of Portfolio Management of BlueCove and has managed the Fund since 2021.

Benoy Thomas, CFA

BlueCove Limited

Mr. Thomas is Head of Credit of BlueCove and has managed the Fund since 2021.

Garth Flannery, CFA

BlueCove Limited

Mr. Flannery is Head of Asset Allocation of BlueCove and has managed the Fund since 2021.

Fund Summary
Harbor Scientific Alpha High-Yield ETF

Buying and Selling Fund Shares

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Harbor Scientific Alpha Income ETF

Fund Summary

Investment Objective

The Fund seeks total return.

Fees and Expenses of the Fund

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

	Rate
Management Fees	0.50%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses1	0.00%
Total Annual Fund Operating Expenses	0.50%

Expense Example

	One Year	Three Years	Five Years	Ten Years
Cost	$51	$160	$280	$628

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Expense Example, do affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 124%. Portfolio turnover rate excludes investments received or delivered from in-kind processing of creation unit purchases or redemptions.

Principal Investment Strategy

The Fund invests primarily in fixed income instruments, including fixed income derivative instruments such as credit default swaps and U.S. Treasury futures. The Fund may invest in exchange-traded funds to manage aggregate portfolio exposures. The Fund may also invest in the securities of foreign issuers, including emerging market bonds. The Fund may invest a majority of its assets in below investment-grade corporate bonds, commonly referred to as “high yield” or “junk” bonds, or unrated securities that BlueCove Limited (the “Subadvisor”) considers to be of an equivalent credit quality. The Subadvisor determines whether a bond is rated below investment grade using a composite rating calculated by assigning a numerical value to those ratings of Moody’s, S&P and Fitch which are available for the bond and averaging those amounts to determine the rating.

The Subadvisor’s investment process utilizes proprietary quantitative models to produce investment recommendations. The Subadvisor generates proprietary insights based on its experience and reasoned intuition to form an investment hypothesis. Using historical market data, the Subadvisor back-tests each investment hypothesis to determine whether actual observations appear consistent with the hypothesis over time. The Subadvisor’s back-testing process involves the development of research parameters, internal peer review, and consideration of a wide range of analyses. Insights are weighted in the Subadvisor’s models according to their deemed strength in predicting returns, as determined by the Subadvisor through this testing process. In managing the Fund, the Subadvisor will rely on market timing insights, which form the basis of asset allocation decisions between corporate credit and interest rate markets and assess metrics such as market expectations for growth and credit default rates. In addition, the Fund will rely on the Subadvisor’s insights that seek to target idiosyncratic company and security specific risk by assessing metrics such as company strength, company outlook, and credit spreads. The Subadvisor’s models consider data from multiple sources, including macroeconomic and issuer-specific information such as default rates, risk appetite, and earnings expectations.

The Subadvisor expects that the majority of the Fund’s total returns will be generated from coupon income and from asset allocation decisions. Positions are sized based on an optimization which aims to effectively translate the insights gleaned from the Subadvisor’s proprietary models into portfolio positions. The Subadvisor’s optimization process seeks to maximize total returns while minimizing expected risk and transaction costs with an aim to manage volatility and drawdown risks. The Subadvisor measures risk at the portfolio level, asset-class level and on each instrument. Furthermore, concentration risk is minimized by capping the exposure based on internal limits for a single issuer and single issue positions, as well as internal limits on the maximum high yield exposure in the Fund. The Subadvisor conducts performance measurement and risk analysis to seek to validate the accuracy of the investment process through both insight and decision attribution, with the aim of achieving continuous improvement over time. The Subadvisor may engage in frequent trading in the Fund to achieve its principal investment strategies.

Duration/Maturity: Duration is one of the characteristics that may be considered in the investment process. The Fund does not

Fund Summary
Harbor Scientific Alpha Income ETF

focus on bonds with any particular duration or maturity and does not seek to maintain the maturity of the Fund’s portfolio in any particular range. The Fund has not commenced operations as of the date of this Prospectus and therefore, the weighted average maturity of the Fund’s portfolio is not available.

Credit Quality: Under normal market conditions, the Fund may invest the majority of its assets in below investment-grade debt securities, commonly referred to as “high yield” or “junk” bonds, in addition to investment-grade securities. As such, the Fund’s weighted average portfolio quality varies from time to time, depending on the level of assets allocated to such securities. The Subadvisor does not seek to actively invest in defaulted securities.

Principal Risks

from broker-dealers and large institutional investors that have entered into participation agreements (unlike shares of closed-end funds, which frequently trade at appreciable discounts from, and sometimes at premiums to, their net asset value), the Advisor believes that large discounts or premiums to the net asset value of shares should not be sustained. During stressed market conditions, the market for the Fund’s shares may become less liquid in response to deteriorating liquidity in the market for the Fund’s underlying portfolio holdings, which could in turn lead to differences between the market price of the Fund’s shares and their net asset value.

Credit Risk: The issuer or guarantor of a security owned by the Fund could default on its obligation to pay principal or interest or its credit rating could be downgraded. Likewise, a counterparty to a derivative or other contractual instrument owned by the Fund could default on its obligation. This risk may be higher for below investment-grade securities.

Derivatives Risk: The value of derivative instruments held by the Fund may not change in the manner expected by the Subadvisor and/or Advisor, as applicable, which could result in

Fund Summary
Harbor Scientific Alpha Income ETF

disproportionately large losses to the Fund. Derivatives may also be more volatile than other instruments and may create a risk of loss greater than the amount invested. In addition, certain derivatives may be difficult to value and may be illiquid.

Emerging Market Risk: Because the Fund may invest in securities of emerging market issuers, an investment in the Fund may be subject to special risks in addition to those of U.S. securities. These risks include heightened political and economic risks, greater volatility, currency fluctuations, higher transaction costs, delayed settlement, possible foreign controls on investment, possible sanctions by governmental bodies of other countries and less stringent investor protection and disclosure standards of foreign markets. Foreign securities are sometimes less liquid and harder to value than securities of U.S. issuers. The securities markets of many foreign countries are relatively small, with a limited number of companies representing a small number of industries. If foreign securities are denominated and traded in a foreign currency, the value of the Fund’s foreign holdings can be affected by currency exchange rates and exchange control regulations. The Fund’s investments in foreign securities may also be subject to foreign withholding taxes.

Foreign securities risks are more significant in emerging market countries. These countries may have relatively unstable governments and less-established market economies than developed countries. Emerging markets may face greater social, economic, regulatory and political uncertainties. These risks make emerging market securities more volatile and less liquid than securities issued in more developed countries. Securities exchanges in emerging markets may suspend listed securities from trading for substantially longer periods of time than exchanges in developed markets, including for periods of a year or longer. If the Fund is holding a suspended security, that security would become completely illiquid as the Fund would not be able to dispose of the security until the suspension is lifted. In such instances, it can also be difficult to determine an appropriate valuation for the security because of a lack of trading and uncertainty as to when trading may resume.

Global economies and financial markets are becoming increasingly interconnected, and conditions and events in one country, region or financial market may adversely impact issuers in a different country, region or financial market.

heightened political and economic risks, greater volatility, currency fluctuations, higher transaction costs, delayed settlement, possible foreign controls on investment, possible sanctions by governmental bodies of other countries and less stringent investor protection and disclosure standards of foreign markets. Foreign securities are sometimes less liquid and harder to value than securities of U.S. issuers. These risks are more significant for issuers in emerging market countries. Global economies and financial markets are becoming increasingly interconnected, and conditions and events in one country, region or financial market may adversely impact issuers in a different country, region or financial market.

Liquidity Risk: The market for high-yield bonds is less liquid than the market for investment-grade bonds. The Fund may at times have greater difficulty buying or selling specific high-yield bonds at prices the Subadvisor believes are reasonable, which would be adverse to the Fund. Valuation of investments may be difficult, particularly during periods of market volatility or reduced liquidity and for investments that trade infrequently or irregularly. In these circumstances, among others, an investment may be valued using fair value methodologies that are inherently subjective and reflect good faith judgments based on available information.

Fund Summary
Harbor Scientific Alpha Income ETF

Performance

The following bar chart and tables are intended to help you understand the risks and potential rewards of investing in the Fund. The bar chart shows the performance of the Fund for the period shown. The table shows how the Fund’s average annual total returns compared to the returns of the Fund’s benchmark index, which includes securities with investment characteristics similar to those held by the Fund. Please note that the Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. To obtain updated performance information please visit the Fund’s website at harborcapital.com or call 800-422-1050.

Calendar Year Total Returns

During the time periods shown in the bar chart, the Fund’s highest and lowest returns for a calendar quarter were:

	Total Returns	Quarter/Year
Best Quarter	2.89%	Q4 2022
Worst Quarter	-6.63%	Q1 2022

Average Annual Total Returns — As of December 31, 2022

	One Year	Annualized			Inception Date
	One Year	Five Years	Ten Years	Since Inception	Inception Date
Harbor Scientific Alpha Income ETF
Before Taxes	-10.85%	N/A	N/A	-9.27%	9/14/2021
After Taxes on Distributions	-12.21%	N/A	N/A	-10.59%
After Taxes on Distributions and Sale of Fund Shares	-6.41%	N/A	N/A	-7.56%
Comparative Index (reflects no deduction for fees, expenses or taxes)
Bloomberg U.S. Aggregate Bond	-13.01%	N/A	N/A	-11.01%

Fund Summary
Harbor Scientific Alpha Income ETF

Portfolio Management

Investment Advisor

Harbor Capital Advisors, Inc.