ETF 485A Passive to Active 033022

PRINCIPAL EXCHANGE-TRADED FUNDS

The date of this Prospectus is ___________________, 2022.


Fund	Ticker Symbol	Principal U.S. Listing Exchange
Principal Healthcare Innovators ETF	BTEC	Nasdaq
Principal Millennials ETF	GENY	Nasdaq
Principal Quality ETF	PSET	Nasdaq
Principal U.S. Mega-Cap ETF	USMC	Nasdaq
Principal U.S. Small-Cap Multi-Factor ETF	PSC	Nasdaq
Principal Value ETF	PY	Nasdaq

On or about July 15, 2022, the Principal Millennials ETF will change its name to the Principal Millennial Global Growth ETF. On that date, delete all references in this prospectus to the Principal Millennials ETF, and replace with Principal Millennial Global Growth ETF.

The Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.


TABLE OF CONTENTS

FUND SUMMARIES
PRINCIPAL HEALTHCARE INNOVATORS ETF			3
PRINCIPAL MILLENNIALS ETF			8
PRINCIPAL QUALITY ETF			14
PRINCIPAL U.S. MEGA-CAP ETF			19
PRINCIPAL U.S. SMALL-CAP MULTI-FACTOR ETF			24
PRINCIPAL VALUE ETF			29
ADDITIONAL INFORMATION ABOUT INVESTMENT STRATEGIES AND RISKS			34
PORTFOLIO HOLDINGS INFORMATION			52
MANAGEMENT OF THE FUNDS			52
DISTRIBUTOR AND OTHER FUND SERVICE PROVIDERS			54
PRICING OF FUND SHARES			54
PURCHASE AND SALE OF FUND SHARES			55
DIVIDENDS AND DISTRIBUTIONS			56
FREQUENT PURCHASES AND REDEMPTIONS			57
TAX CONSIDERATIONS			57
DISTRIBUTION PLANS AND INTERMEDIARY COMPENSATION			58
FUND ACCOUNT INFORMATION			58
UNDERLYING INDICES			60
APPENDIX A - DESCRIPTION OF BOND RATINGS			A
APPENDIX B - FINANCIAL HIGHLIGHTS			B
ADDITIONAL INFORMATION			C

PRINCIPAL HEALTHCARE INNOVATORS ETF

At its December 2021 meeting, the Fund's Board approved a proposal for the Fund to change from a passively managed fund to an actively managed fund. As noted below, the Fund expects several changes will be effective on or about July 15, 2022, when the Fund expects to begin transitioning to active management.

Objective: The Fund seeks to provide investment results that closely correspond, before expenses, to the performance of the Nasdaq US Health Care Innovators Index (the "Index").

On our about July 15, 2022, delete the above Objective and replace with the following:

Objective: The Fund seeks long-term growth of capital.

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 ("Shares"). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table or the example below.

Annual Fund Operating Expenses

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


Management Fees			0.42%
Other Expenses			—%
Total Annual Fund Operating Expenses (1)			0.42%

(1) The investment management agreement (the “Management Agreement”) between the Fund and Principal Global Investors, LLC (“PGI”) provides that, for the duration of the Management Agreement, PGI will pay all operating expenses of the Fund, except for the Management Fee, payments made under each Series 12b-1 plan (if or when such fees are imposed), brokerage commissions and other expenses connected to the execution of portfolio transactions, interest expense, taxes, acquired fund fees and expenses, litigation expenses and other extraordinary expenses.

Example

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds.


	1 year	3 years	5 years	10 years
Principal Healthcare Innovators ETF	$43	$135	$235	$530

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 rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 45.8% of the average value of its portfolio.

On our about July 15, 2022, add the following sentence to the above paragraph:

The Fund's transition to active management may cause it to experience an abnormally high level of portfolio turnover during the period of the transition.

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies that compose the Index at the time of purchase. The Index uses a quantitative model designed to identify equity securities (emphasizing growth stock) in the Nasdaq US Benchmark Index (the "Parent Index") that are small and medium capitalization U.S. healthcare companies. Most of the companies in the Index are "early-stage companies" within the healthcare equipment and supplies, pharmaceuticals, biotechnology, and life sciences industries that are not yet consistently profitable. Examples include companies developing products and services and companies in the pre-marketing stage seeking regulatory approvals.

To be eligible for the Index, a security must be a component of the Parent Index, and each security must be classified as Health Care according to Industry Classification Benchmark (ICB). Securities are ranked based upon their market capitalization, and the least liquid securities are excluded. The Index employs a modified market capitalization

weighting methodology; final eligible securities receive a maximum weight of 3%, and all excess weight is distributed proportionally across the remaining index securities.

The Index is rebalanced semi-annually. Additionally, throughout the year securities that become ineligible for the Index are removed and not replaced. The Fund will make corresponding changes to its portfolio shortly after Index changes are made public. As of June 30, 2021, the Index included 303 components, and the Parent Index included 2,960 components. More detailed information about the Index methodology is provided in the prospectus under Underlying Indices.

The Fund employs a passive investment approach designed to attempt to track the performance of the Index. In seeking its objective, the Fund typically employs a "full replication" strategy which involves investing in all the securities that make up the Index, in the same approximate proportions as the Index. The Fund can, however, use a “sampling” methodology to purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The Fund can also invest in securities not included in the Index that the Advisor believes will help the fund track the Index.

The Fund will not concentrate its investments (invest more than 25% of its assets) in a particular industry except to the extent the Index is so concentrated. Given the present composition of the Index, the Fund expects to concentrate its investments in one or more industries within the healthcare sector. As of June 30, 2021, the Fund’s investments were concentrated in the biotech and life sciences industry and the health care equipment and services industry.

On our about July 15, 2022, delete the above Principal Investment Strategies and replace with the following:

Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies in the healthcare sector. For this fund, healthcare companies are those classified as Health Care according to Global Industry Classification Standard. For security selection and portfolio construction, Principal Global Investors, LLC (“PGI”) uses a proprietary quantitative model designed to identify equity securities (emphasizing growth stock) of small and medium capitalization in the Russell 2000 Healthcare Index, while seeking to exclude the least liquid securities. The Fund invests significantly in early-stage companies within the healthcare equipment and supplies, pharmaceuticals, biotechnology, and life sciences industries that are not yet consistently profitable. Examples include companies developing products and services and companies in the pre-marketing stage seeking regulatory approvals.

The Fund’s holdings are expected to be rebalanced at least annually. However, PGI may make any adjustments to the model and Fund holdings at its discretion. In constructing and revising the model and managing the Fund’s investments, PGI uses insights from diverse sources, including external research, to develop and refine its investment themes and identify and take advantage of trends that may impact the Fund and its holdings.

The Fund will concentrate its investments (invest more than 25% of its assets) in one or more industries within the healthcare sector.

Principal Risks

The value of your investment in the Fund changes with the value of the Fund's investments. Many factors affect that value, and it is possible to lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The principal risks of investing in the Fund are listed below in alphabetical order and not in order of significance.

Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer's sector or industry, or changes in response to overall market and economic conditions. A fund's principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.

•Growth Style Risk. Growth investing entails that risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.

•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets or financial resources, lack the competitive strength of larger companies, have less experienced managers or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.

Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.

Industry Concentration Risk. A fund that concentrates investments in a particular industry or group of industries has greater exposure than other funds to market, economic and other factors affecting that industry or group of industries.

•Healthcare Sector Risk. Given the present composition of the Index, the Fund expects to have more than 25% of its assets invested in one or more industries within the healthcare sector. A fund that invests in securities of companies in the healthcare sector (which includes companies involved in several industries, including biotechnology research and production, drugs and pharmaceuticals and health care equipment and services) is subject to the direct risks of investing in such companies. These companies are subject to extensive competition (due to, among others, generic drug sales or the loss of patent protection), product liability litigation and increased government regulation. Research and development costs of bringing new drugs to market are substantial, and there is no guarantee that a proposed product will ever come to market. Such companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. Healthcare facility operators may be affected by the demand for services, efforts by government or insurers to limit rates, restriction of government financial assistance and competition from other providers.

Market Trading Risks. The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, and disruption to the activities of market makers, authorized participants, or other participants and in the creation/redemption process of the Fund. ANY OF THESE FACTORS MAY LEAD TO THE FUND’S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

Redemption and Large Transaction Risk. Ownership of the fund's shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains.

On our about July 15, 2022, delete the above Index Fund Risk and Industry Concentration Risk , and replace with the following in alphabetical order:

• Healthcare Sector Risk. The Fund invests 25% or more of its assets in one or more industries within the healthcare sector. A fund that invests in securities of companies in the healthcare sector (which includes companies involved in several industries, including biotechnology research and production, drugs and pharmaceuticals and health care equipment and services) is subject to the direct risks of investing in such companies. These companies are subject to extensive competition (due to, among others, generic drug sales or the loss of patent protection), product liability litigation and increased government regulation. Research and development costs of bringing new drugs to market are substantial, and there is no guarantee that a proposed product will ever come to market. Such companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. Healthcare facility operators may be affected by the demand for services, efforts by government or insurers to limit rates, restriction of government financial assistance and competition from other providers.

Model Risk. Because PGI uses quantitative models to select and hold securities, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. Moreover, models may be predictive in nature and depend heavily on the accuracy and reliability of historical data that is supplied by others and may be incorrect or incorrectly input. The Fund bears the risk that the quantitative models used will not be successful in identifying trends or in determining the size and direction of investment positions that will enable the Fund to achieve its investment objective.

Performance

The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information online at www.principaletfs.com.

The bar chart shows the investment returns of the Fund’s shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.

Life of Fund returns are measured from the date the Fund's shares were first sold (August 19, 2016).

On our about July 15, 2022, add the following:

Prior to July 15, 2022, the objective and strategy of the Fund differed from its current objective and strategy. Accordingly, performance of the Fund for periods prior to that date may not be representative of the performance the Fund would have achieved had the Fund been following its current objective and strategy.

Total Returns as of December 31 (1)


Highest return for a quarter during the period of the bar chart above:	2Q 2020	40.76%
Lowest return for a quarter during the period of the bar chart above:	4Q 2018	(24.91)%

(1) The year-to-date return as of September 30, 2021 is (6.72)%.


Average Annual Total Returns (Based on NAV) For the periods ended December 31, 2020(1)
	1 Year	Life of Fund
Return Before Taxes	52.52%	21.70%
Return After Taxes on Distributions	52.30%	21.64%
Return After Taxes on Distributions and Sale of Fund Shares	31.10%	17.63%
Nasdaq US Health Care Innovators Index (reflects no deductions for fees, expenses or taxes)	52.77%	22.20%
Add on or about July 15, 2022: Russell 2000 Healthcare Index (reflects no deductions for fees, expenses, or taxes)	45.30%	21.50%
(1) Add the following on or about July 15, 2022: Prior to July 15, 2022, the objective and strategy of the Fund differed from its current objective and strategy. Accordingly, performance of the Fund for periods prior to that date may not be representative of the performance the Fund would have achieved had the Fund been following its current objective and strategy.

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 depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

On or about July 15, 2022, add the following:

Effective July 15, 2022, the Fund changed its primary broad-based index to the Russell 2000 Healthcare Index in connection with the Fund's change to an actively managed Fund. Prior to that date, the Fund was passively managed to correspond to the Nasdaq US Health Care Innovators Index.

Investment Advisor and Portfolio Managers

Principal Global Investors, LLC

•Jeffrey A. Schwarte (since 2016), Portfolio Manager

•Aaron J. Siebel (since 2020), Portfolio Manager

Purchase and Sale of Fund Shares

The Fund issues and redeems Shares at net asset value (“NAV”) only with authorized participants ("APs") who have entered into agreements with the Fund’s distributor and only in blocks of 50,000 Shares (each block of Shares is called a "Creation Unit"), or multiples thereof ("Creation Unit Aggregations"), in exchange for the deposit or delivery of a basket of securities that the Fund specifies each day. Except when aggregated in Creation Units, the Shares are not redeemable securities of the Fund. Typically, the basket of assets will be made up of securities, but may include a cash component. (See "Purchase and Redemption of Creation Units" in the Statement of Additional Information for more information.)

Shares of the Fund are listed for trading on The Nasdaq Stock Market LLC. Individual Shares may only be bought and sold in the secondary market through a broker or dealer at a market price. Because Shares trade at market prices rather than NAV, Shares may trade at prices greater than NAV (at a premium), at NAV, or less than NAV (at a 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 Shares on the secondary market (the bid-ask spread).

You can access recent information, including information on the Fund’s net asset value, market price, premiums and discounts, and bid-ask spreads at www.principaletfs.com.

Tax Information

The Fund’s distributions you receive are generally subject to federal income tax as ordinary income or capital gain and may also be subject to state and local taxes, unless you are tax-exempt or your account is tax-deferred in which case your distributions would be taxed when withdrawn from the tax-deferred account.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase the Fund through a broker-dealer or other financial intermediary (such as a bank, insurance company, investment adviser, etc.), the Fund and its related companies may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary's website for more information.

PRINCIPAL MILLENNIALS ETF

Objective: The Fund seeks to provide investment results that closely correspond, before expenses, to the performance of the Nasdaq Global Millennial Opportunity Index (the "Index").

On our about July 15, 2022, delete the above Objective and replace with the following:

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)


Management Fees			0.45%
Other Expenses			—%
Total Annual Fund Operating Expenses (1)			0.45%

Example

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds.


	1 year	3 years	5 years	10 years
Principal Millennials ETF	$46	$144	$252	$567

Portfolio Turnover

On our about July 15, 2022, add the following sentence to the above paragraph:

The Fund's transition to active management may cause it to experience an abnormally high level of portfolio turnover during the period of the transition.

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies that compose the Index at the time of purchase. The Index uses a quantitative model designed to identify equity securities of companies in the Nasdaq Global Index (the "Parent Index") that are impacted by the spending and lifestyle activities of the Millennial generation, which refers to people born from 1980 to the mid-2000s. The Index may include U.S. and foreign (including emerging market) securities. The Index may include equity securities of different market capitalizations (small, medium, or large) and styles (growth or value) and is weighted based upon market capitalization and exposure to Millennials. Market segments with the greatest

Millennial exposure are likely to include, without limitation, consumer goods (including fashion and apparel), social media and e-commerce, and digital media and technology.

To be eligible for the Index, a security must be a component of the Parent Index. However, an exchange-listed security that is not a component of the Parent Index may be eligible if it otherwise meets all of the eligibility criteria. Each security's exposure to Millennials is determined using a proprietary, multi-step research process. Each company is identified as having low, medium, or high exposure to Millennials based on the materiality of the company's exposure to Millennial-related themes and the potential role of Millennials in driving long-term growth. To be eligible for the Index, a security must have high or medium exposure to Millennials. "Medium exposure" means that Millennials-related products, technologies, services and solutions are an important factor of the company's business model, strategy and research and development, and are material to sales and/or growth. "High exposure" means that Millennials-related products, technologies, services and solutions are core to the company's business model, strategy and research and development, and are material to sales and/or growth. Securities of companies having high exposure to Millennials receive 70% of the weight of the index, and securities of companies having medium exposure to Millennials receive 30% of the weight of the index.

The Index is rebalanced annually. Additionally, throughout the year securities that become ineligible for the Index are removed and not replaced. The Fund will make corresponding changes to its portfolio shortly after Index changes are made public. As of June 30, 2021, the Index included 131 components, and the Parent Index included 9,003 components. More detailed information about the Index methodology is provided in the prospectus under Underlying Indices.

The Fund employs a passive investment approach designed to attempt to track the performance of the Index. In seeking its objective, the Fund typically employs a "full replication" strategy which involves investing in all the securities that make up the Index, in the same approximate proportions as the Index. The Fund can, however, use a “sampling” methodology to purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The Fund can also invest in securities not included in the Index that the advisor believes will help the fund track the Index.

The Fund will not concentrate its investments (invest more than 25% of its assets) in a particular industry except to the extent the Index is so concentrated. As of June 30, 2021, the Fund’s investments were concentrated in the media and entertainment industry and the retailing industry, and the Fund invested significantly in the communication services sector.

On our about July 15, 2022, delete the above Principal Investment Strategies and replace with the following:

Principal Investment Strategies

Under normal circumstances, the Fund primarily invests in equity securities, focusing on growth equity securities. Growth strategies emphasize buying equity securities of companies whose potential for growth of capital and earnings is expected to be above average. In particular, the Fund seeks to invest in securities of companies that are impacted by the spending and lifestyle activities of the Millennial generation, which refers to people born from 1980 to the mid-2000s. For security selection and portfolio construction, Principal Global Investors, LLC (“PGI”) uses a proprietary quantitative model designed to identify equity securities of companies in the MSCI ACWI Index with medium or high Millennial exposure, based on the materiality of the company's exposure to Millennial-related themes and the potential role of Millennials in driving long-term growth. For example, a security of a company with high exposure means that PGI has determined that Millennials-related products, technologies, services and solutions are core to the company's business model, strategy and research and development, and are material to sales and/or growth. Market segments with the greatest Millennial exposure are likely to include, without limitation, consumer goods (including fashion and apparel), social media and e-commerce, and digital media and technology. Under normal circumstances, the Fund invests at least 40% of its net assets in foreign and emerging market securities. The Fund invests in equity securities of different market capitalizations (small, medium, or large) and also uses value style strategies as part of the model.

The Fund will concentrate its investments (invest more than 25% of its assets) in one or more industries within the consumer discretionary sector and one or more industries within the communication services sector.

Principal Risks

Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.

•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and therefore would not be profitable for the fund.

Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.

Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).

Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.

Industry and Sector Risks Related to Investing in Companies with Millennial Exposure. The Fund invests in companies with millennial exposure, which are likely to include companies involved in producing or distributing clothing and apparel, food (including restaurants), and consumer staples, as well as companies involved in the provision of social networks and social media, digital media, live events and entertainment, travel and transportation services, financial services and investments, housing and housing services and educational services. Such companies may be affected by changes in consumers’ disposable income, consumer preferences, social trends and marketing campaigns. Millennial companies generally face a high degree of competition and potentially rapid product obsolescence. The customers and/or suppliers of millennial companies may be concentrated in a particular country, region or industry. Any adverse event affecting one of these countries, regions or industries could have a negative impact on millennial companies. Millennial companies may participate in monopolistic practices that could make them subject to higher levels of regulatory scrutiny and/or potential break ups in the future, which could severely impact the viability of these companies.

•Communication Services Sector Risks. Companies in the communications sector may be affected by industry competition, substantial capital requirements, government regulation, cyclical revenues and earnings, obsolescence of communications products and services due to technological advancement, a potential decrease in the discretionary income of targeted individuals, and changing consumer tastes and interests.

•Consumer Goods and Consumer Services Sectors Risk. The Fund invests in securities of companies in the consumer services and consumers goods sectors to the extent the Index is composed of such securities. Such companies are particularly subject to risks related to performance of the overall global economy, interest rates, competition, government regulation, and consumer confidence. Success depends heavily on disposable income and consumer spending, and is also impacted by consumer interest and marketing campaigns. Companies in these sectors may be subject to severe competition, which may have an adverse impact on their profitability. Changes in demographics and consumer tastes can affect the demand for, and success of, consumer goods and services in the marketplace.

•Media and Entertainment Industries Risk. Companies engaged in the design, production or distribution of goods or services for the media industry may become obsolete quickly. Media companies are subject to risks that include cyclical revenues and earnings, a decrease in the discretionary income of targeted individuals, changing consumer tastes and interests, fierce competition in the industry, and the potential for increased government regulation. Additionally, intellectual property rights are very important to many media companies, and the expiration of intellectual property rights or other events that adversely affect a media company’s intellectual property rights may materially and adversely affect the value of its securities.

On our about July 15, 2022, delete the above Index Fund Risk , and replace with the following in alphabetical order:

Performance

Life of Fund returns are measured from the date the Fund's shares were first sold (August 19, 2016).

On our about July 15, 2022, add the following:

Total Returns as of December 31 (1)


Highest return for a quarter during the period of the bar chart above:	2Q 2020	35.13%
Lowest return for a quarter during the period of the bar chart above:	1Q 2020	(23.30)%

(1) The year-to-date return as of September 30, 2021 is 4.47%


Average Annual Total Returns (Based on NAV) For the periods ended December 31, 2020(1)
	1 Year	Life of Fund
Return Before Taxes	41.00%	22.19%
Return After Taxes on Distributions	40.53%	21.91%
Return After Taxes on Distributions and Sale of Fund Shares	24.23%	17.95%
Nasdaq Global Millennial Opportunity Index (NTR) (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)	41.67%	22.46%
Add on or about July 15, 2022: MSCI ACWI Index NTR (reflects withholding taxes on foreign dividends, no deductions for fees, expenses, or taxes)	16.80%	13.30%
(1) Add the following on or about July 15, 2022: Prior to July 15, 2022, the objective and strategy of the Fund differed from its current objective and strategy. Accordingly, performance of the Fund for periods prior to that date may not be representative of the performance the Fund would have achieved had the Fund been following its current objective and strategy.

On or about July 15, 2022, add the following:

Effective July 15, 2022, the Fund changed its primary broad-based index to the MSCI ACWI Index in connection with the Fund's change to an actively managed Fund. Prior to that date, the Fund was passively managed to correspond to the Nasdaq Global Millennial Opportunity Index.

Investment Advisor and Portfolio Managers

Principal Global Investors, LLC

•Jeffrey A. Schwarte (since 2016), Portfolio Manager

•Aaron J. Siebel (since 2020), Portfolio Manager

Purchase and Sale of Fund Shares

You can access recent information, including information on the Fund’s net asset value, market price, premiums and discounts, and bid-ask spreads at www.principaletfs.com.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

PRINCIPAL QUALITY ETF

At its December 2021 meeting, the Fund's Board approved a proposal for the Fund to change from a passively managed fund to an actively managed fund. As noted below, the Fund expects several changes will be effective on or about June 17, 2022, when the Fund expects to begin transitioning to active management.

Objective: The Fund seeks to provide investment results that closely correspond, before expenses, to the performance of the Nasdaq US Price Setters Index (the "Index").

On our about June 17, 2022, delete the above Objective and replace with the following:

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)


Management Fees			0.15%
Other Expenses			—%
Total Annual Fund Operating Expenses (1)			0.15%

(1) The investment management agreement (the “Management Agreement”) between the Fund and Principal Global Investors, LLC (“PGI”) provides that, for the duration of the Management Agreement, PGI will pay all operating expenses of the Fund, except the Management Fee, payments made under each Series 12b-1 plan (if or when such fees are imposed), brokerage commissions and other expenses connected to the execution of portfolio transactions, interest expense, taxes, acquired fund fees and expenses, litigation expenses and other extraordinary expenses.

Example

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds.


	1 year	3 years	5 years	10 years
Principal Quality ETF	$15	$48	$85	$192

Portfolio Turnover

On our about June 17, 2022, add the following sentence to the above paragraph:

The Fund's transition to active management may cause it to experience an abnormally high level of portfolio turnover during the period of the transition.

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies that compose the Index at the time of purchase. The Index uses a quantitative model designed to identify equity securities of mid- to large-capitalization companies in the Nasdaq US Large Mid Cap Index (the "Parent Index") that exhibit higher quality, growth potential, and pricing power. "Pricing power" refers to the extent to which a company can raise the prices of its products without reducing the demand for them.

To be eligible for the Index, a security must be a component of the Parent Index and must be a top 550 name by market capitalization. Securities are ranked based upon eleven factors that include calculations based on earnings per share ("EPS") growth, operating margin, operating margin growth, return volatility, sales growth, return on equity, and earning quality. The average of the 11 factor scores is taken to create one score used to rank the securities. The top 150 securities by final rank are selected. The Index employs a modified equal dollar weighting methodology with those in the higher ranking groups receiving relatively more weight.

The Index is rebalanced annually. Additionally, throughout the year securities that become ineligible for the Index are removed and not replaced. The Fund will make corresponding changes to its portfolio shortly after Index changes are made public. As of June 30, 2021, the Index included 148 components, and the Parent Index included 974 components. More detailed information about the Index methodology is provided in the prospectus under Underlying Indices.

The Fund employs a passive investment approach designed to attempt to track the performance of the Index. In seeking its objective, the Fund typically employs a "full replication" strategy which involves investing in all the securities that make up the Index, in the same approximate proportions as the Index. The Fund can, however, use a “sampling” methodology to purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The Fund can also purchase securities not included in the Index that the advisor believes will help the fund track the Index.

The Fund will not concentrate its investments (invest more than 25% of its assets) in a particular industry except to the extent the Index is so concentrated. Due to the composition of the Index, the Fund invested significantly in one or more industries within the healthcare sector as of June 30, 2021. The Fund’s strategies may result in the active and frequent trading of the Fund’s portfolio securities.

On our about June 17, 2022, delete the above Principal Investment Strategies and replace with the following:

Principal Investment Strategies

Under normal circumstances, the Fund primarily invests in equity securities. For security selection and portfolio construction, Principal Global Investors, LLC (“PGI”) uses a proprietary quantitative model designed to identify equity securities in the S&P 500 Index or S&P 400 Index that exhibit higher quality, growth potential, and pricing power. "Pricing power" refers to the extent to which a company can raise the prices of its products without reducing the demand for them. The model ranks and weights eligible securities based upon factors such as earnings per share ("EPS") growth, operating margin, operating margin growth, return volatility, sales growth, return on equity, and earning quality. The Fund invests in equity securities of different market capitalizations (medium or large) and styles (growth or value).

The Fund invested significantly in one or more industries within the healthcare sector as of June 30, 2021.

Note: "Standard & Poor's 500" and "S&P 500 ® " are trademarks of S&P Global and have been licensed by Principal. The Fund is not sponsored, endorsed, sold, or promoted by S&P Global and S&P Global makes no representation regarding the advisability of investing in the Fund.

Principal Risks

•Medium Market Capitalization Companies. Investments in medium sized companies may involve greater risk and price volatility than investments in larger, more mature companies.

Healthcare Sector Risk. A fund that invests in securities of companies in the healthcare sector (which includes companies involved in several industries, including biotechnology research and production, drugs and pharmaceuticals and health care facilities and services) is subject to the direct risks of investing in such companies. These companies are subject to extensive competition (due to, among others, generic drug sales or the loss of patent protection), product liability litigation and increased government regulation. Research and development costs of bringing new drugs to market are substantial, and there is no guarantee that a proposed product will ever come to market. Such companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. Healthcare facility operators may be affected by the demand for services, efforts by government or insurers to limit rates, restriction of government financial assistance and competition from other providers.

On our about June 17, 2022, delete the above Index Fund Risk and Industry Concentration Risk, and replace with the following in alphabetical order:

Performance

Life of Fund returns are measured from the date the Fund's shares were first sold (March 21, 2016).

On our about June 17, 2022, add the following:

Prior to June 17, 2022, the objective and strategy of the Fund differed from its current objective and strategy. Accordingly, performance of the Fund for periods prior to that date may not be representative of the performance the Fund would have achieved had the Fund been following its current objective and strategy.

Total Returns as of December 31 (1)


Highest return for a quarter during the period of the bar chart above:	2Q 2020	20.69%
Lowest return for a quarter during the period of the bar chart above:	1Q 2020	(19.38)%

(1) The year-to-date return as of September 30, 2021 is 14.4%.


Average Annual Total Returns (Based on NAV) For the periods ended December 31, 2020(1)
	1 Year	Life of Fund
Return Before Taxes(2)	16.35%	15.78%
Return After Taxes on Distributions	15.75%	15.35%
Return After Taxes on Distributions and Sale of Fund Shares	9.62%	12.57%
Nasdaq US Price Setters Index (reflects no deductions for fees, expenses or taxes)	13.26%	15.48%
Add on or about June 17, 2022: S&P 500 Index (reflects no deductions for fees, expenses, or taxes)	18.40%	15.80%
(1) Add the following on or about June 17, 2022: Prior to June 17, 2022, the objective and strategy of the Fund differed from its current objective and strategy. Accordingly, performance of the Fund for periods prior to that date may not be representative of the performance the Fund would have achieved had the Fund been following its current objective and strategy.
(2) During 2020, the Fund experienced a one-time gain of approximately $1.13 per share as the result of a one-time infusion of capital by the Manager due to an operational error by a third party. If such gain had not been recognized, the total return amounts expressed in the preceding sentence would have been lower.

On or about June 17, 2022, add the following:

Effective June 17, 2022, the Fund changed its primary broad-based index to the S&P 500 Index in connection with the Fund's change to an actively managed Fund. Prior to that date, the Fund was passively managed to correspond to the Nasdaq US Price Setters Index.

Investment Advisor and Portfolio Managers

Principal Global Investors, LLC

•Jeffrey A. Schwarte (since 2016), Portfolio Manager

•Aaron J. Siebel (since 2020), Portfolio Manager

Purchase and Sale of Fund Shares

You can access recent information, including information on the Fund’s net asset value, market price, premiums and discounts, and bid-ask spreads at www.principaletfs.com.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

PRINCIPAL U.S. MEGA-CAP ETF

At its December 2021 meeting, the Fund's Board approved a proposal for the Fund to change from a passively managed fund to an actively managed fund. As noted below, the Fund expects several changes will be effective on or about June 10, 2022, when the Fund expects to begin transitioning to active management.

Objective: The Fund seeks to provide investment results that closely correspond, before expenses, to the performance of the Nasdaq US Mega Cap Select Leaders Index (the "Index").

On our about June 10, 2022, delete the above Objective and replace with the following:

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)


Management Fees			0.15%
Other Expenses			—%
Total Annual Fund Operating Expenses (1)			0.15%
Fee Waiver and/or Expense Reimbursement (2)			(0.03)%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement			0.12%

(2) Principal Global Investors, LLC ("PGI") has contractually agreed to reduce total annual fund operating expenses for the Fund by waiving a portion of its management fee, or reimbursing the Fund, to the extent that total expenses exceed 0.12% (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) expressed as a percent of average net assets on an annualized basis. It is expected that the expense limit will continue through the period ending October 31, 2022; however, Principal Exchange-Traded Funds and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period.

Example

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds.

The Example assumes that you invest $10,000 in the Fund for the time periods indicated. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:


	1 year	3 years	5 years	10 years
Principal U.S. Mega-Cap ETF	$12	$45	$82	$189

Portfolio Turnover

On our about June 10, 2022, add the following sentence to the above paragraph:

The Fund's transition to active management may cause it to experience an abnormally high level of portfolio turnover during the period of the transition.

Principal Investment Strategies

The Parent Index is composed of equity securities of U.S. issuers with large market capitalizations. To be eligible for the Index, a security must be in the top 50th percentile of the Parent Index by aggregate company market capitalization. As of June 30, 2021, the market capitalization range of the companies in the Parent Index was between approximately $2.0 billion and $2.2 trillion.

The Index employs a modified equal-dollar weighting methodology. With respect to securities of companies in the top 10% of aggregate market capitalization, companies with the largest market capitalizations receive relatively more weight. Securities of the remaining companies are equally weighted and volatility adjusted, which gives higher weight to securities that are less volatile.

The Index is rebalanced semi-annually. Additionally, throughout the year securities that become ineligible for the Index are removed and not replaced. The Fund will make corresponding changes to its portfolio shortly after the Index changes are made public. As of June 30, 2021, the Index included 45 components, and the Parent Index included 499 components. More detailed information about the Index methodology is provided in the prospectus under Underlying Indices.

The Fund employs a passive investment approach designed to attempt to track the performance of the Index. In seeking its objective, the Fund typically employs a "full replication" strategy which involves investing in all the securities that make up the Index, in the same approximate proportions as the Index. The Fund can, however, use a “sampling” methodology to purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The Fund can also purchase securities not included in the Index that the advisor believes will help the fund track the Index.

On our about June 10, 2022, delete the above Principal Investment Strategies and replace with the following:

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with very large ("mega") market capitalizations at the time of purchase. For this Fund, companies with mega capitalizations are those with market capitalizations in the top 50 th percentile of the S&P 500 Index at the time of purchase. As of December 31, 2021, the market capitalization range of the companies in the S&P 500 Index was between approximately $8 billion to $1.69 trillion.

For security selection and portfolio construction, Principal Global Investors, LLC (“PGI”) uses a proprietary quantitative model. The model is designed to identify equity securities of companies in the S&P 500 Index that have the largest market capitalizations, while typically applying higher weight to securities that PGI determines are less volatile. The Fund invests in equity securities of different styles (growth or value).

The Fund invested significantly in one or more industries within the information technology sector as of June 30, 2021.

Principal Risks

Information Technology Sector Risk. Companies in the information technology sector may face dramatic and often unpredictable changes in growth rates and are particularly vulnerable to changes in technology product cycles, product obsolescence, government regulation, and competition, both domestically and internationally. Such companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability.

On our about June 10, 2022, delete the above Index Fund Risk and Industry Concentration Risk, and replace with the following in alphabetical order:

Performance

Life of Fund returns are measured from the date the Fund's shares were first sold (October 11, 2017).

On our about June 10, 2022, add the following:

Prior to June 10, 2022, the objective and strategy of the Fund differed from its current objective and strategy. Accordingly, performance of the Fund for periods prior to that date may not be representative of the performance the Fund would have achieved had the Fund been following its current objective and strategy.

Total Returns as of December 31 (1)


Highest return for a quarter during the period of the bar chart above:	2Q 2020	16.44%
Lowest return for a quarter during the period of the bar chart above:	1Q 2020	(17.17)%

(1) The year-to-date return as of September 30, 2021 is 13.74%


Average Annual Total Returns (Based on NAV) For the periods ended December 31, 2020(1)
	1 Year	Life of Fund
Return Before Taxes	16.03%	13.91%
Return After Taxes on Distributions	15.19%	13.26%
Return After Taxes on Distributions and Sale of Fund Shares	9.42%	10.72%
Nasdaq US Mega Cap Select Leaders Index (reflects no deductions for fees, expenses or taxes)	16.26%	14.14%
Add on or about June 10, 2022: S&P 500 Index (reflects no deductions for fees, expenses, or taxes)	18.40%	14.90%
(1) Add the following on or about June 10, 2022: Prior to June 10, 2022, the objective and strategy of the Fund differed from its current objective and strategy. Accordingly, performance of the Fund for periods prior to that date may not be representative of the performance the Fund would have achieved had the Fund been following its current objective and strategy.

On or about June 10, 2022, add the following:

Effective June 10, 2022, the Fund changed its primary broad-based index to the S&P 500 Index in connection with the Fund's change to an actively managed Fund. Prior to that date, the Fund was passively managed to correspond to the Nasdaq US Mega Cap Select Leaders Index.

Investment Advisor and Portfolio Managers

Principal Global Investors, LLC

•Jeffrey A. Schwarte (since 2017), Portfolio Manager

•Aaron J. Siebel (since 2020), Portfolio Manager

Purchase and Sale of Fund Shares

The Fund issues and redeems Shares at net asset value (“NAV”) only with authorized participants who have entered into agreements with the Fund’s distributor and only in blocks of 50,000 Shares (each block of Shares is called a "Creation Unit"), or multiples thereof ("Creation Unit Aggregations"), in exchange for the deposit or delivery of a basket of securities that the Fund specifies each day. Except when aggregated in Creation Units, the Shares are not redeemable securities of the Fund. Typically, the basket of assets will be made up of securities, but may include a cash component. (See "Purchase and Redemption of Creation Units" in the Statement of Additional Information for more information.)

You can access recent information, including information on the Fund’s net asset value, market price, premiums and discounts, and bid-ask spreads at www.principaletfs.com.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

PRINCIPAL U.S. SMALL-CAP MULTI-FACTOR ETF

At its December 2021 meeting, the Fund's Board approved a proposal for the Fund to change from a passively managed fund to an actively managed fund. As noted below, the Fund expects several changes will be effective on or about July 8, 2022, when the Fund expects to begin transitioning to active management .

Objective: The Fund seeks to provide investment results that closely correspond, before expenses, to the performance of the Nasdaq US Small Cap Select Leaders Index (the "Index").

On our about July 8, 2022, delete the above Objective and replace with the following:

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)


Management Fees			0.38%
Other Expenses			—%
Total Annual Fund Operating Expenses (1)			0.38%

Example

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds.


	1 year	3 years	5 years	10 years
Principal U.S. Small-Cap Multi-Factor ETF	$39	$122	$213	$480

Portfolio Turnover

On our about July 8, 2022, add the following sentence to the above paragraph:

The Fund's transition to active management may cause it to experience an abnormally high level of portfolio turnover during the period of the transition.

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies that compose the Index at the time of purchase. The Index uses a quantitative model designed to identify equity securities (including growth and value stock) of small-capitalization companies in the Nasdaq US Small Cap Index (the "Parent Index") that exhibit potential for high degrees of value, quality growth, and strong momentum, while adjusting for liquidity and volatility. As of June 30, 2021, the market capitalization range of the companies comprising the Parent Index was between approximately $26.6 million and $28.4 billion.

To be eligible for the Index, a security must: be a component of the Parent Index; be in the top 90th percentile of the Nasdaq US Benchmark Index in terms of 3-month Average Daily Dollar Volume and have a minimum 3-month trading history, among other factors. One security per issuer is permitted.

Each security is ranked according to three factors:

•The Shareholder Yield (value factor) ranks securities based on the collective financial impact on a company's shareholders from the return of free cash flow through cash dividends, stock repurchases, and debt reduction. This factor is designed to identify securities with low prices relative to their fundamental value.

•The Price Setters (quality growth factor) ranks securities based on pricing power, which is the extent to which a company can raise the prices of its products without reducing the demand for them.

•The Momentum Factor ranks securities based on recent performance relative to their peers.

Each security has a Shareholder Yield, Price Setters, and Momentum rank that is based on that security's Industry Classification Benchmark ("ICB") within the Index. The ranks are then averaged to determine a rank for each security within each ICB. The ranks are then averaged to determine eligibility for inclusion in the Index. Securities that rank in the top 20% are included in the Index, in addition to securities already in the Index that rank in the top 50%. Securities are weighted by their liquidity-volatility score, in an effort to give greater weight to securities that are more liquid and less volatile. Once an initial weight is determined, a final weight initially caps each security's weight at 0.7%.

The Index is rebalanced semi-annually. Additionally, throughout the year securities that become ineligible for the Index are removed and not replaced. The Fund will make corresponding changes to its portfolio shortly after Index changes are made public. As of June 30, 2021, the Index included 516 components, and the Parent Index included 1,986 components. More detailed information about the Index methodology is provided in the prospectus under Underlying Indices.

The Fund employs a passive investment approach designed to attempt to track the performance of the Index. In seeking its objective, the Fund typically employs a "full replication" strategy which involves investing in all the securities that make up the Index, in the same approximate proportions as the Index. The Fund can, however, use a “sampling” methodology to purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The Fund can also invest in securities not included in the Index that the advisor believes will help the fund track the Index.

The Fund will not concentrate (invest more than 25% of its assets) its investments in a particular industry except to the extent the Index is so concentrated.

On our about July 8, 2022, delete the above Principal Investment Strategies and replace with the following:

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with small market capitalizations at the time of purchase. For this Fund, companies with small market capitalizations are those with market capitalizations within the range of companies comprising the Russell 2000 Index. As of December 31, 2021, the market capitalization range of the companies comprising the Russell 2000 Index was between approximately $31 million to $14 billion.

For security selection and portfolio construction, Principal Global Investors, LLC (“PGI”) uses a proprietary quantitative model designed to identify and rank equity securities (including growth and value stock) of small-capitalization companies in the Russell 2000 Index that correspond to factor categories such as the following:

• Value companies - securities with low prices relative to their fundamental value, measured by such metrics as earnings yield, free cash flow yield, and sales yield.

• Higher quality companies – securities ranked based on metrics such as return on equity, sales growth, earnings growth, and balance sheet measures of quality (such as lower debt and accruals).

• Higher momentum companies - securities ranked by evaluating recent performance.

In weighting securities, the model seeks to assign greater weight to securities that PGI determines are more liquid and less volatile.

Principal Risks

and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The principal risks of investing in the Fund are listed below in alphabetical order and not in order of significance.

Momentum Style Risk. Stocks that previously exhibited high momentum characteristics may not experience positive momentum or may experience more volatility than the market as a whole. In addition, there may be periods when momentum style is out of favor, during which the investment performance of a Fund that uses momentum-based strategies may suffer.

On our about July 8, 2022, delete the above Index Fund Risk and Industry Concentration Risk, and replace with the following in alphabetical order:

Performance

Life of Fund returns are measured from the date the Fund's shares were first sold (September 21, 2016).

On our about July 8, 2022, add the following:

Prior to July 8, 2022, the objective and strategy of the Fund differed from its current objective and strategy. Accordingly, performance of the Fund for periods prior to that date may not be representative of the performance the Fund would have achieved had the Fund been following its current objective and strategy.

Total Returns as of December 31 (1)


Highest return for a quarter during the period of the bar chart above:	4Q 2020	30.83%
Lowest return for a quarter during the period of the bar chart above:	1Q 2020	(32.95)%

(1) The year-to-date return as of September 30, 2021 is 25.67%.


Average Annual Total Returns (Based on NAV) For the periods ended December 31, 2020(1)
	1 Year	Life of Fund
Return Before Taxes	13.45%	10.58%
Return After Taxes on Distributions	12.72%	10.16%
Return After Taxes on Distributions and Sale of Fund Shares	7.87%	8.21%
Nasdaq US Small Cap Select Leaders Index (reflects no deductions for fees, expenses or taxes)	13.73%	11.03%
Add on or about July 8, 2022: Russell 2000 Index (reflects no deductions for fees, expenses, or taxes)	20.00%	13.30%
(1) Add the following on or about July 8, 2022: Prior to July 8, 2022, the objective and strategy of the Fund differed from its current objective and strategy. Accordingly, performance of the Fund for periods prior to that date may not be representative of the performance the Fund would have achieved had the Fund been following its current objective and strategy.

On or about July 8, 2022, add the following:

Effective July 8, 2022, the Fund changed its primary broad-based index to the Russel 2000 Index in connection with the Fund's change to an actively managed Fund. Prior to that date, the Fund was passively managed to correspond to the Nasdaq US SmallCap Select Leaders Index.

Investment Advisor and Portfolio Managers

Principal Global Investors, LLC

•Jeffrey A. Schwarte (since 2016), Portfolio Manager

•Aaron J. Siebel (since 2020), Portfolio Manager

Purchase and Sale of Fund Shares

You can access recent information, including information on the Fund’s net asset value, market price, premiums and discounts, and bid-ask spreads at www.principaletfs.com.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

PRINCIPAL VALUE ETF

At its December 2021 meeting, the Fund's Board approved a proposal for the Fund to change from a passively managed fund to an actively managed fund. As noted below, the Fund expects several changes will be effective on or about June 17, 2022, when the Fund expects to begin transitioning to active management.

Objective: The Fund seeks to provide investment results that closely correspond, before expenses, to the performance of the Nasdaq US Shareholder Yield Index (the "Index").

On our about June 17, 2022, delete the above Objective and replace with the following:

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)


Management Fees			0.15%
Other Expenses			—%
Total Annual Fund Operating Expenses (1)			0.15%

(1) The investment management agreement (the “Management Agreement”) between the Fund and Principal Global Investors, LLC (“PGI”) provides that, for the duration of the Management Agreement, PGI will pay all operating expenses of the Fund, except the Management Fee, payments made under each Series 12b-1 plan (if or when such fees are imposed), brokerage commissions and other expenses connected to the execution of portfolio transactions, interest expense, taxes, acquired fund fees and expenses, litigation expenses and other extraordinary expenses.

Example

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds.


	1 year	3 years	5 years	10 years
Principal Value ETF	$15	$48	$85	$192

Portfolio Turnover

On our about June 17, 2022, add the following sentence to the above paragraph:

The Fund's transition to active management may cause it to experience an abnormally high level of portfolio turnover during the period of the transition.

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies that compose the Index at the time of purchase. The Index uses a quantitative model designed to identify equity securities (emphasizing value stock) of mid- to large-capitalization companies in the Nasdaq US Large Mid Cap Index (the "Parent Index") that exhibit higher degrees of shareholder yield, in an effort to produce a value-based portfolio with a higher quality focus than is customary in traditional value approaches.

To be eligible for the Index, a security must be a component of the Parent Index and the security must have paid a regular dividend in the prior year. Securities are ranked based upon nine factors that include calculations based on dividend yield, buyback yield, dividend payout per share, free cash flow, price, Sharpe ratio, EBITDA, debt, dividend yield historical valuation, and dividend growth. Securities that rank in the top 20% are included in the Index. The Index employs a modified yield weighting methodology, weighting securities according to their dividend yields. Final eligible securities receive a maximum weight of 3%, and all excess weight is distributed proportionally across the remaining Index securities.

The Index is rebalanced annually. Additionally, throughout the year securities that become ineligible for the Index are removed and not replaced. The Fund will make corresponding changes to its portfolio shortly after Index changes are made public. As of June 30, 2021, the Index included 115 components, and the Parent Index included 974 components. More detailed information about the Index methodology is provided in the prospectus under Underlying Indices.

The Fund employs a passive investment approach designed to attempt to track the performance of the Index. In seeking its objective, the Fund typically employs a "full replication" strategy which involves investing in all the securities that make up the Index, in the same approximate proportions as the Index. The Fund can, however, use a “sampling” methodology to purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The Fund can also purchase securities not included in the Index that the advisor believes will help the fund track the Index.

The Fund will not concentrate its investments (invest more than 25% of its assets) in a particular industry except to the extent the Index is so concentrated. Due to the composition of the Index, the Fund invested significantly in one or more industries within the financial services sector (i.e., banking, insurance and commercial finance industries) as of June 30, 2021.

On our about June 17, 2022, delete the above Principal Investment Strategies and replace with the following:

Principal Investment Strategies

Under normal circumstances, the Fund primarily invests in equity securities, focusing on value stocks. For security selection and portfolio construction, Principal Global Investors, LLC ("PGI") uses a proprietary quantitative model designed to identify equity securities of mid- to large-capitalization companies in the S&P 500 Index that exhibit higher degrees of shareholder yield, in an effort to produce a value-based portfolio with a higher quality focus than is customary in traditional value approaches.

The model includes securities that have paid a regular dividend in the prior year. The model ranks and weights securities based upon factors such as dividend yield, buyback yield, dividend payout per share, free cash flow, price, Sharpe ratio, EBITDA, debt, dividend yield historical valuation, and dividend growth.

The Fund invested significantly in one or more industries within the financial services sector (i.e., banking, insurance and commercial finance industries) as of June 30, 2021.

Principal Risks

•Medium Market Capitalization Companies. Investments in medium sized companies may involve greater risk and price volatility than investments in larger, more mature companies.

Financial Services Sector Risk. A fund that invests significantly in financial services companies may be more susceptible to adverse economic or regulatory occurrences affecting financial services companies. Financial companies may be adversely affected in certain market cycles, including periods of rising interest rates, which may restrict the availability and increase the cost of capital, and declining economic conditions, which may cause credit losses due to financial difficulties of borrowers. Because many types of financial companies are especially vulnerable to these economic cycles, the Fund’s investments in these companies may lose significant value during such periods.

On our about June 17, 2022, delete the above Index Fund Risk and Industry Concentration Risk, and replace with the following:

Performance

Life of Fund returns are measured from the date the Fund's shares were first sold (March 21, 2016).

On our about June 17, 2022, add the following:

Total Returns as of December 31 (1)


Highest return for a quarter during the period of the bar chart above:	2Q 2020	22.18%
Lowest return for a quarter during the period of the bar chart above:	1Q 2020	(33.36)%

(1) The year-to-date return as of September 30, 2021 is 24.66%.


Average Annual Total Returns (Based on NAV) For the periods ended December 31, 2020(1)
	1 Year	Life of Fund
Return Before Taxes	2.51%	9.26%
Return After Taxes on Distributions	1.07%	8.49%
Return After Taxes on Distributions and Sale of Fund Shares	1.34%	7.08%
Nasdaq US Shareholder Yield Index (reflects no deductions for fees, expenses or taxes)	2.65%	9.62%
Add on or about June 17, 2022: S&P 500 Index (reflects no deductions for fees, expenses, or taxes)	18.40%	15.80%
(1) Add the following on or about June 17, 2022: Prior to June 17, 2022, the objective and strategy of the Fund differed from its current objective and strategy. Accordingly, performance of the Fund for periods prior to that date may not be representative of the performance the Fund would have achieved had the Fund been following its current objective and strategy.

On or about June 17, 2022, add the following:

Investment Advisor and Portfolio Managers

Principal Global Investors, LLC

•Jeffrey A. Schwarte (since 2016), Portfolio Manager

•Aaron J. Siebel (since 2020), Portfolio Manager

Purchase and Sale of Fund Shares

You can access recent information, including information on the Fund’s net asset value, market price, premiums and discounts, and bid-ask spreads at www.principaletfs.com.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

ADDITIONAL INFORMATION ABOUT INVESTMENT STRATEGIES AND RISKS

Each Fund’s investment objective is described in the summary section for each Fund. The summary section also describes each Fund’s principal investment strategies, including the types of securities in which each Fund invests, and the principal risks of investing in each Fund. The principal investment strategies are not the only investment strategies available to each Fund, but they are the ones each Fund primarily uses to achieve its investment objective.

Except for Fundamental Restrictions described in the Fund’s Statement of Additional Information (“SAI”), the Board may change any Fund's objective or investment strategies without a shareholder vote if it determines such a change is in the best interests of the Fund. If there is a material change to a Fund's investment objective or investment strategies, you should consider whether the Fund remains an appropriate investment for you. There is no guarantee that a Fund will meet its objective.

Each Fund is designed to be a portion of an investor's portfolio. No Fund is intended to be a complete investment program. Investors should consider the risks of a Fund before making an investment; it is possible to lose money by investing in a Fund.

Holdings Disclosure

On each business day, before commencement of trading on the exchange, each Fund will disclose on www.principaletfs.com the identities and quantities of the Fund’s portfolio holdings that will form the basis for the Fund’s calculation of the Fund’s net asset value at the end of the business day.

Active Management

The performance of a fund that is actively managed (including hybrid funds or passively-managed funds that use a sampling approach that includes some actively-managed components) will reflect in part the ability of those managing the investments of the fund to make investment decisions that are suited to achieving the fund's investment objective. Actively-managed funds may invest differently from the benchmark against which the fund's performance is compared. When making decisions about whether to buy or sell equity securities, considerations may include, among other things, a company’s strength in fundamentals, its potential for earnings growth over time, its ability to navigate certain macroeconomic environments, the current price of its securities relative to their perceived worth and relative to others in its industry, and analysis from computer models. When making decisions about whether to buy or sell fixed-income investments, considerations may include, among other things, the strength of certain sectors of the fixed-income market relative to others, interest rates, a range of economic, political and financial factors, the balance between supply and demand for certain asset classes, the credit quality of individual issuers, the fundamental strengths of corporate and municipal issuers, and other general market conditions.

Models, which may assist portfolio managers and analysts in formulating their securities trading and allocation decisions by providing investment and risk management insights, may also expose a fund to risks. Models may be predictive in nature, which models depend heavily on the accuracy and reliability of historical data that is supplied by others and may be incorrect or incorrectly input. The fund bears the risk that the quantitative models used will not be successful in identifying trends or in determining the size and direction of investment positions that will enable the fund to achieve its investment objective. In addition, “model prices” will often differ substantially from market prices, especially for instruments with complex characteristics, such as derivative instruments.

An active fund's investment performance depends upon the successful allocation of the fund's assets among asset classes, geographical regions, industry sectors, and specific issuers and investments. There is no guarantee that these allocation techniques and decisions will produce the desired results. It is possible to lose money on an investment in a fund as a result of these allocation decisions. If a fund's investment strategies do not perform as expected, the fund could underperform other funds with similar investment objectives or lose money. Moreover, buying and selling securities to adjust the fund’s asset allocation may increase portfolio turnover and generate transaction costs.

Investment advisors with large assets under management in a Fund, or in other funds that have the same strategy as a Fund, may have difficulty fully investing such Fund’s assets according to its investment objective due to potential liquidity constraints and high transaction costs. Typically, small-cap, mid-cap and emerging market equity funds are more susceptible to such a risk. A Fund may add additional investment advisors or close the Fund to new investors to address such risks.

Passive Management (Index Funds)

Index funds use a passive, or indexing, investment approach. Funds that are pure index funds do not attempt to manage market volatility, use defensive strategies or reduce the effect of any long-term periods of poor stock or bond performance. Some index funds may attempt to fully replicate their relevant target index by investing primarily in the securities held by the index in approximately the same proportion of the weightings in the index. However, because of the difficulty of executing some relatively small securities trades, other index funds may use a "sampling" approach and may not be invested in the less heavily weighted securities held by the index. Some index funds may invest in index futures, swaps, and/or exchange-traded funds on a daily basis in an effort to minimize tracking error relative to the benchmark.

It is unlikely that an index fund's performance will perfectly correlate with the performance of the fund's relevant index. An index fund's ability to match the performance of its index may be affected by many factors, such as fund expenses, the timing of cash flows into and out of the fund, changes in securities markets, and changes in the composition of the index.

The providers of the Funds’ respective underlying indexes do not provide any warranty or accept any liability for the quality, accuracy or completeness of any index or its related data. Those managing an index fund’s investments manage such fund consistently with the underlying index provided by the index provider and do not provide any warranty or guarantee against the index provider’s or its agent’s errors. Errors in the quality, accuracy and completeness of the data used to compile an underlying index may occur and may not be identified and corrected in a timely manner, or at all. Such errors may negatively or positively impact the performance of a fund.

Unusual market conditions may cause an index provider to postpone a scheduled rebalance, which could cause a fund’s underlying index to vary from its normal or expected composition. The postponement of a scheduled rebalance, particularly in a time of market volatility, could mean that constituents that would otherwise be removed at rebalance due to changes in market capitalizations, issuer credit ratings, or other reasons may remain, causing the performance and constituents of the underlying index to vary from those expected under normal conditions. Apart from scheduled rebalances, an index provider may carry out additional index rebalances due to unusual market conditions or in order, for example, to correct an error in the selection of index constituents. When an index is rebalanced and an index fund in turn rebalances its portfolio, such fund and its shareholders bear any related transaction costs and market exposure.

More detailed information about each Fund's index methodology is provided in the prospectus under Underlying Indices.

Cash Management

Funds may have uninvested cash balances pending investment in other securities, pending payment of redemptions, or in other circumstances where liquidity is necessary or desirable. A Fund may hold uninvested cash; invest it in cash equivalents such as money market funds, including the Principal Funds, Inc. Government Money Market Fund; lend it to other Funds pursuant to the Funds' interfund lending facility; and/or invest in other instruments that those managing the Fund’s assets deem appropriate for cash management purposes. Generally, these types of investments offer less potential for gains than other types of securities. To attempt to provide returns similar to its benchmark, a Fund may invest uninvested cash in stock index futures contracts or exchange-traded funds ("ETFs"), including Principal Exchange-Traded Funds ETFs. In selecting such investments, the Advisor may have conflicts of interest due to economic or other incentives to make or retain an investment in certain affiliated funds instead of in other investments that may be appropriate for the Fund.

Liquidity

The Funds have established a liquidity risk management program as required by the SEC’s Liquidity Rule. Under the program, PGI assesses, manages, and periodically reviews each Fund’s liquidity risk, which is the risk that a Fund could not meet requests to redeem shares issued by the Fund without significant dilution of the remaining investors’ interests in the Fund. As part of the program, PGI classifies each investment as a “highly liquid investment,” “moderately liquid investment,” “less liquid investment” or “illiquid investment.” The liquidity of a Fund’s portfolio investments is determined based on relevant market, trading and investment-specific considerations under the program. To the extent that an investment is deemed to be an illiquid investment or a less liquid investment, a Fund can expect to be exposed to greater liquidity risk.

Certain fund holdings may be deemed to be less liquid or illiquid because they cannot be readily sold without significantly impacting the value of the holdings. A fund is exposed to liquidity risk when trading volume, lack of a market maker, or legal restrictions impair its ability to sell particular securities or close derivative positions at an advantageous price. Funds with principal investment strategies that involve securities of companies with smaller market capitalizations, foreign securities, derivatives, high yield bonds and bank loans or securities with substantial market and/or credit risk tend to have the greatest exposure to liquidity risk.

Liquidity risk also refers to the risk of unusually high redemption requests, redemption requests by certain large shareholders such as institutional investors or asset allocators, or other unusual market conditions that may make it difficult for a fund to sell investments within the allowable time period to meet redemptions. Meeting such redemption requests could require a fund to sell securities at reduced prices or under unfavorable conditions, which would reduce the value of the fund.

Additional liquidity risks that apply to ETFs are described under "Market Trading Risks" below.

Market Volatility and Securities Issuers

The value of a fund’s portfolio securities may decrease in response to overall stock or bond market movements. Markets tend to move in cycles, with periods of rising prices and periods of falling prices. Stocks tend to go up and down in value more than bonds. The value of a security may decline for reasons directly related to the issuer, such as management performance, financial leverage, and reduced demand for the issuer’s goods or services. As a result, the value of an individual security or particular type of security can be more volatile than the market as a whole and can perform differently from the value of the market as a whole.

Additionally, US and world economies, as well as markets (or certain market sectors), may experience greater volatility in response to the occurrence of natural or man-made disasters and geopolitical events, such as war, acts of terrorism, pandemics, military actions, trade disputes, or political instability. Moreover, if a fund’s investments are concentrated in certain sectors, its performance could be worse than the overall market.

Recent events are impacting the securities markets. Russia's invasion of the Ukraine in 2022 has resulted in sanctions being levied by the United States, European Union and other countries against Russia. Russia's military actions and the resulting sanctions could adversely affect global energy and financial markets and, thus, could affect the value of the fund's investments, even beyond any direct exposure the fund may have to Russian issuers or the adjoining geographic regions. The extent and duration of the military action, sanctions and resulting market disruptions could be substantial.

Other recent market disruption events include the pandemic spread of the novel coronavirus designated as COVID-19. The transmission of COVID-19 and efforts to contain its spread resulted in border closings and other travel restrictions and disruptions, disruptions to business operations, supply chains and customer activity, event cancellations and restrictions, service cancellations and reductions, significant challenges in the healthcare industry, and quarantines. As experienced with the COVID-19 pandemic, health crises may exacerbate other pre-existing political, social, economic, market and financial risks and negatively affect the global economy, as well as the economies of individual countries, the financial performance of individual companies and sectors, and the markets in general in significant ways.

Market disruption events could also impair the information technology and other operational systems upon which a fund’s investment advisor or sub-advisor rely, and could otherwise disrupt the ability of the fund’s service providers to perform essential tasks. In certain cases, an exchange or market may close or issue trading halts on either specific securities or even the entire market, which may result in a fund being, among other things, unable to buy or sell certain securities or financial instruments or accurately price its investments.

Governmental and quasi-governmental authorities and regulators throughout the world, such as the Federal Reserve, have in the past responded to major economic disruptions with a variety of significant fiscal and monetary policy changes, including but not limited to, direct capital infusions into companies, new monetary programs, and dramatically lower interest rates. Certain of those policy changes were implemented or considered in response to the COVID-19 outbreak. Such policy changes may adversely affect the value, volatility and liquidity of dividend and interest paying securities.

The impact of current and future market disruption events may last for an extended period of time and could result in a substantial economic downturn or recession. Such events could have significant adverse direct or indirect effects on the funds and their investments, and may result in a fund’s inability to achieve its investment objectives, cause funds to experience significant redemptions, cause the postponement of reconstitution/rebalance dates of passive funds’ underlying indices, adversely affect the prices and liquidity of the securities and other instruments in which a fund invests, negatively impact the fund’s performance, and cause losses on your investment in the fund. You should also review this Prospectus and the Statement of Additional Information to understand each fund’s discretion to implement temporary defensive measures, as well as the circumstances in which a fund may satisfy redemption requests in-kind.

Securities Lending

To generate additional income, a Fund may lend its portfolio securities to broker-dealers and other institutional borrowers to the extent permitted under the 1940 Act or the rules, regulations or interpretations thereunder. A Fund that lends its securities will continue to receive amounts equal to the interest or dividend payments generated by the loaned securities. In addition to receiving these amounts, the Fund generates income on the loaned securities by receiving a fee from the borrower, and by earning interest on the collateral received from the borrower. A negotiated portion of the income is paid to a securities lending agent (e.g., a bank or trust company) who arranged the loan. During the term of the loan, the Fund’s investment performance will reflect changes in the value of the loaned securities.

A borrower’s obligations under a securities loan is secured continuously by collateral posted by the borrower and held by the custodian in an amount at least equal to the market value of the loaned securities. Generally, cash collateral that a Fund receives from securities lending activities will be invested in money market funds, which may include the Principal Funds, Inc. Government Money Market Fund, which is managed by PGI and for which PGI receives a management fee. Collateral may also be invested in unaffiliated money market funds.

Securities lending involves exposure to certain risks, including the risk of losses resulting from problems in the settlement and accounting process, the risk of a mismatch between the return on cash collateral reinvestments and the fees each Fund has agreed to pay a borrower, and credit, legal, counterparty and market risk. A Fund’s participation in a securities lending transaction may affect the amount, timing, and character of distributions derived from such transaction to shareholders. Qualified dividend income does not include “payments in lieu of dividends,” which the Funds anticipate they will receive in securities lending transactions.

Temporary Defensive Measures

From time to time, as part of its investment strategy, a Fund may invest without limit in cash and cash equivalents for temporary defensive purposes in response to adverse market, economic, or political conditions. For this purpose, cash equivalents include: bank notes, bank certificates of deposit, bankers' acceptances, repurchase agreements, commercial paper, and commercial paper master notes, which are floating rate debt instruments without a fixed maturity. In addition, each Fund may purchase U.S. government securities, preferred stocks, and debt securities, whether or not convertible into or carrying rights for common stock. There is no limit on the extent to which a Fund may take temporary defensive measures. In taking such measures, a Fund may lose the benefit of upswings and may limit its ability to meet, or fail to achieve, its investment objective.

Trading Issues

Although the shares of the Funds are expected to be listed on the exchange identified in the fund summary for each Fund, there can be no assurance that an active trading market for such shares will develop or be maintained. Trading in Shares on the exchange may be halted due to market conditions or for reasons that, in the view of the exchange, make trading in Shares inadvisable. In addition, trading in Shares on the exchange is subject to trading halts caused by extraordinary market volatility pursuant to the exchange's "circuit breaker" rules. There can be no assurance that the requirements of the exchange necessary to maintain the listing of a Fund will continue to be met or will remain unchanged.

Strategy and Risk Table

The following table lists each Fund and identifies whether the strategies and risks discussed in this section (listed in alphabetical order) are principal, non-principal (meaning they are relevant to a Fund but to a lesser degree than those designated as principal), or not applicable for each Fund. Each fund is also subject to the risks of any underlying funds in which it invests.

The SAI contains additional information about investment strategies and their related risks.

INVESTMENT STRATEGIES AND RISKS

Principal Healthcare Innovators ETF

Principal
Millennials ETF

Principal

Quality ETF

Principal U.S. Mega-Cap ETF

Bank Loans (also known as Senior Floating Rate interests)

Not Applicable

Contingent Convertible Securities

Not Applicable

Convertible Securities

Not Applicable

Counterparty Risk

Not Applicable

Derivatives

Not Applicable

Emerging Markets

Not Applicable

Principal

Not Applicable

Equity Securities

Principal

•Growth Style

Principal

•Smaller Companies

Principal

Not Applicable

•Value Style

Non-Principal

Principal

Fixed-Income Securities

Not Applicable

Foreign Currency

Non-Principal

Principal

Non-Principal

Not Applicable

Foreign Securities

Non-Principal

Principal

Non-Principal

Not Applicable

Hedging

Not Applicable

High Portfolio Turnover

Non-Principal

High Yield Securities

Not Applicable

Industry Concentration

Principal (1)

Investment Company Securities

Not Applicable

Leverage

Not Applicable

Market Trading Risks

Principal

Master Limited Partnerships (MLPs)

Not Applicable

Momentum Style

Not Applicable

Portfolio Duration

Not Applicable

Preferred Securities

Not Applicable

Real Estate Investment Trusts (REITs)

Non-Principal

Real Estate Securities

Non-Principal

Redemption and Large Transaction Risk

Principal

Securitized Products

Not Applicable

U.S. Government and U.S. Government-Sponsored Securities

Not Applicable

(1) An index Fund using a replication strategy may concentrate (invest more than 25% of its assets) its investments in a particular industry only to the extent the relevant index is so concentrated.


INVESTMENT STRATEGIES AND RISKS	Principal U.S. Small-Cap Multi-Factor ETF	Principal Value ETF
Bank Loans (also known as Senior Floating Rate interests)	Not Applicable	Not Applicable
Contingent Convertible Securities	Not Applicable	Not Applicable
Convertible Securities	Not Applicable	Not Applicable
Counterparty Risk	Not Applicable	Not Applicable
Derivatives	Not Applicable	Not Applicable
Emerging Markets	Non-Principal	Non-Principal
Equity Securities	Principal	Principal
•Growth Style	Principal	Non-Principal
•Smaller Companies	Principal	Principal
•Value Style	Principal	Principal
Fixed-Income Securities	Not Applicable	Not Applicable
Foreign Currency	Non-Principal	Non-Principal
Foreign Securities	Non-Principal	Non-Principal
Hedging	Not Applicable	Not Applicable
High Portfolio Turnover	Non-Principal	Non-Principal
High Yield Securities	Not Applicable	Not Applicable
Industry Concentration	Principal (1)	Principal (1)
Investment Company Securities	Not Applicable	Not Applicable
Leverage	Not Applicable	Not Applicable
Market Trading Risks	Principal	Principal
Master Limited Partnerships (MLPs)	Not Applicable	Not Applicable
Momentum Style	Principal	Not Applicable
Portfolio Duration	Not Applicable	Not Applicable
Preferred Securities	Not Applicable	Not Applicable
Real Estate Investment Trusts (REITs)	Non-Principal	Non-Principal
Real Estate Securities	Non-Principal	Non-Principal
Redemption and Large Transaction Risk	Principal	Principal
Securitized Products	Not Applicable	Not Applicable
U.S. Government and U.S. Government-Sponsored Securities	Not Applicable	Not Applicable

(1) An index Fund using a replication strategy may concentrate (invest more than 25% of its assets) its investments in a particular industry only to the extent the relevant index is so concentrated.

Delete the row for Industry Concentration in the above table for the following Funds, and replace with the following on or about the date indicated for each Fund:

• Effective July 15, 2022, for Principal Healthcare Innovators ETF, industry concentration is Principal.

• Effective July 15, 2022, for Principal Millennials ETF, industry concentration is Principal.

• Effective June 17, 2022, for Principal Quality ETF, industry concentration is Not Applicable.

• Effective June 10, 2022, for Principal U.S. Mega-Cap ETF, industry concentration is Not Applicable.

• Effective July 8, 2022, for Principal U.S. Small-Cap Multi-Factor ETF, industry concentration is Not Applicable.

• Effective June 17, 2022, for Principal Value ETF, industry concentration is Not Applicable.

Bank Loans (also known as Senior Floating Rate Interests)

Bank loans typically hold the most senior position in the capital structure of a business entity (the "Borrower"), are secured by specific collateral, and have a claim on the Borrower's assets and/or stock that is senior to that held by the Borrower's unsecured subordinated debtholders and stockholders. The proceeds of bank loans primarily are used to finance leveraged buyouts, recapitalizations, mergers, acquisitions, stock repurchases, dividends, and, to a lesser extent, to finance internal growth and for other corporate purposes. Bank loans are typically structured and administered by a financial institution that acts as the agent of the lenders participating in the bank loan. The Funds may purchase bank loans that are rated below-investment-grade (sometimes called “junk”) or will be comparable if unrated, which means they are more likely to default than investment-grade loans. A default could lead to non-

payment of income which would result in a reduction of income to the fund, and there can be no assurance that the liquidation of any collateral would satisfy the Borrower's obligation in the event of non-payment of scheduled interest or principal payments, or that such collateral could be readily liquidated. Most bank loans are not traded on any national securities exchange. Bank loans generally have less liquidity than investment-grade bonds and there may be less public information available about them. Bank loan interests may not be considered "securities," and purchasers therefore may not be entitled to rely on the anti-fraud protections of the federal securities laws.

The primary and secondary market for bank loans may be subject to irregular trading activity, wide bid/ask spreads and extended trade settlement periods, which may cause a fund to be unable to realize full value and thus cause a material decline in a fund's net asset value. Because transactions in bank loans may be subject to extended settlement periods, a fund may not receive proceeds from the sale of a bank loan for a period of time after the sale. As a result, sale proceeds may not be available to make additional investments or to meet a fund's redemption obligations for a period of time after the sale of the bank loans, which could lead to a fund having to sell other investments, borrow to meet obligations, or borrow to remain fully invested while awaiting settlement.

Bank loans pay interest at rates which are periodically reset by reference to a base lending rate plus a spread. These base lending rates are generally the prime rate offered by a designated U.S. bank or the London InterBank Offered Rate (LIBOR), the Secured Overnight Financing Rate (SOFR), a similar reference rate, or the prime rate offered by one or more major U.S. banks.

Bank loans generally are subject to mandatory and/or optional prepayment. Because of these prepayment conditions and because there may be significant economic incentives for the borrower to repay, prepayments may occur.

Contingent Convertible Securities ("CoCos")

Contingent convertible securities (“CoCos”) are hybrid debt securities intended to either convert into equity or have their principal written down upon the occurrence of certain “triggers.” The triggers are generally linked to regulatory capital thresholds or regulatory actions calling into question the issuing banking institution’s continued viability as a going-concern, if the conversion trigger were not exercised. CoCos’ unique equity conversion or principal write-down features are tailored to the issuing banking institution and its regulatory requirements. Some additional risks associated with CoCos include, but are not limited to, the following:

•The occurrence of a conversion event is inherently unpredictable and depends on many factors, some of which will be outside the issuer’s control. Because of the uncertainty regarding whether a conversion event will occur, it may be difficult to predict when, if at all, a CoCo will be converted to equity, and a fund may suffer losses as a result.

•CoCos may have no stated maturity and fully discretionary coupons. This means coupon (i.e., interest) payments can be canceled at the banking institution’s discretion or at the request of the relevant regulatory authority in order to help the bank absorb losses, without causing a default.

•CoCos are usually issued in the form of subordinated debt instruments to provide the appropriate regulatory capital treatment. If an issuer liquidates, dissolves or winds-up before a conversion to equity has occurred, the rights and claims of the holders of the CoCos (such as a fund) against the issuer generally rank junior to the claims of holders of unsubordinated obligations of the issuer. In addition, if the CoCos are converted into the issuer’s underlying equity securities after a conversion event (i.e., a “trigger”), each holder will be further subordinated.

•The value of CoCos is unpredictable and is influenced by many factors including, without limitation: the creditworthiness of the issuer and/or fluctuations in such issuer’s applicable capital ratios; supply and demand for CoCos; general market conditions and available liquidity; and economic, financial and political events that affect the issuer, its particular market or the financial markets in general. Moreover, the performance of CoCos may be correlated with one another and as a result negative information of one issuer may cause decline in the value of CoCos of many other issuers.

Due to these features, CoCos may have substantially greater risk than other securities in times of financial stress. If the trigger level is breached, the issuer’s decision to write down, write off or convert a CoCo may result in the fund's complete loss on an investment in CoCos with no chance of recovery even if the issuer remains in existence.

Convertible Securities

Convertible securities are usually fixed-income securities that a fund has the right to exchange for equity securities at a specified conversion price. Convertible securities could also include corporate bonds, notes or preferred stocks of U.S. or foreign issuers. Convertible securities allow a Fund to realize additional returns if the market price of the equity securities exceeds the conversion price. For example, a Fund may hold fixed-income securities that are convertible

into shares of common stock at a conversion price of $10 per share. If the market value of the shares of common stock reached $12, the Fund could realize an additional $2 per share by converting its fixed-income securities.

Convertible securities have lower yields than comparable fixed-income securities. In addition, at the time a convertible security is issued the conversion price exceeds the market value of the underlying equity securities. Thus, convertible securities may provide lower returns than non-convertible fixed-income securities or equity securities depending upon changes in the price of the underlying equity securities. However, convertible securities permit a Fund to realize some of the potential appreciation of the underlying equity securities with less risk of losing its initial investment.

Depending on the features of the convertible security, a fund will treat a convertible security as a fixed-income security, equity security, or preferred security for purposes of investment policies and limitations because of the unique characteristics of convertible securities. Funds that invest in convertible securities may invest in convertible securities that are below investment grade (sometimes referred to as "junk"). Many convertible securities are relatively illiquid.

Counterparty Risk

Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations. If a counterparty fails to meet its contractual obligations, goes bankrupt, or otherwise experiences a business interruption, a fund could miss investment opportunities or otherwise hold investments it would prefer to sell, resulting in losses for the fund. In addition, a fund may suffer losses if a counterparty fails to comply with applicable laws or other requirements. Counterparty risk is pronounced during unusually adverse market conditions and is particularly acute in environments in which financial services firms are exposed to systemic risks.

Derivatives

Generally, a derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. A fund may invest in certain derivative strategies to earn income, manage or adjust the risk profile of the fund, replace more direct investments, or obtain exposure to certain markets. A fund may enter into forward commitment agreements, which call for the fund to purchase or sell a security on a future date at a fixed price. A fund may also enter into contracts to sell its investments either on demand or at a specific interval.

The risks associated with derivative investments include:

•increased volatility of a fund and/or the failure of the investment to mitigate volatility as intended;

•the inability of those managing investments of the fund to predict correctly the direction of securities prices, interest rates, currency exchange rates, asset values, and other economic factors;

•losses caused by unanticipated market movements, which may be substantially greater than a fund's initial investment and are potentially unlimited;

•the possibility that there may be no liquid secondary market which may make it difficult or impossible to close out a position when desired;

•the possibility that the counterparty may fail to perform its obligations; and

•the inability to close out certain hedged positions to avoid adverse tax consequences.

There are many different types of derivatives and many different ways to use them. The specific derivatives that are principal strategies of each Fund are listed in its Fund Summary.

•Commodity Index-Linked Notes are derivative debt instruments issued by U.S. and foreign banks, brokerage firms, insurance companies and other corporations with principal and/or coupon payments linked to the performance of commodity indices. Commodities are assets that have tangible properties, such as oil, coal, natural gas, agricultural products, industrial metals, livestock and precious metals. These notes expose a fund to movements in commodity prices. They are also subject to credit, counterparty, and interest rate risk. Commodity index-linked notes are often leveraged, increasing the volatility of each note's market value relative to changes in the underlying commodity index. At the maturity of the note, a fund may receive more or less principal than it originally invested. A fund may also receive interest payments on the note that are less than the stated coupon interest payments.

•Credit Default Swap Agreements may be entered into by a fund as a "buyer" or "seller" of credit protection. Credit default swap agreements involve special risks because they may be difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). Credit default swaps can increase credit risk because a fund has exposure to both the issuer of the referenced obligation and the counterparty to the credit default swap.

•Foreign Currency Contracts (such as foreign currency options and foreign currency forward and swap agreements) may be used by funds to increase exposure to a foreign currency or to shift exposure to foreign currency fluctuations from one country to another. A forward currency contract involves a privately negotiated obligation to purchase or sell a specific currency at a future date at a price set in the contract. For currency

contracts, there is also a risk of government action through exchange controls that would restrict the ability of a fund to deliver or receive currency.

•Forwards, futures contracts and options thereon (including commodities futures); options (including put or call options); and swap agreements and over-the-counter swap agreements (e.g., interest rate swaps, total return swaps and credit default swaps) may be used by funds for hedging purposes in order to try to mitigate or protect against potential losses due to changing interest rates, securities prices, asset values, currency exchange rates, and other market conditions; non-hedging purposes to seek to increase the fund’s income or otherwise enhance return; and as a low-cost method of gaining exposure to a particular market without investing directly in those securities or assets. These derivative investments are subject to special risk considerations, particularly the imperfect correlation between the change in market value of the instruments held by a fund and the price of the derivative instrument. If a fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements, even when it may be disadvantageous to do so. Options and Swap Agreements also involve counterparty risk. With respect to options, there may be difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets) and an insufficient liquid secondary market for particular options.

•Index/structured securities. Certain derivative securities are described more accurately as index/structured securities, which are derivative securities whose value or performance is linked to other equity securities (such as depositary receipts), currencies, interest rates, indices, or other financial indicators (reference indices).

Emerging Markets

The Funds consider a security to be tied economically to an emerging market (an “emerging market security”) if the issuer of the security has its principal place of business or principal office in an emerging market, has its principal securities trading market in an emerging market, or derives a majority of its revenue from emerging markets.

Usually, the term "emerging market" (also referred to as a "developing market") means any market that is considered to be an emerging market by the international financial community (such as markets tied to securities included in the MSCI Emerging Markets Index or Bloomberg Barclays Emerging Markets USD Aggregate Bond Index). Emerging markets generally exclude the U.S., Canada, Japan, Australia, New Zealand, Hong Kong, and Singapore and most nations located in Western Europe.

Investments in companies in emerging markets are subject to higher risks than investments in companies in more developed markets. These risks include:

•increased social, political, and economic instability;

•a smaller market for these securities and low or nonexistent trading volume that results in a lack of liquidity and greater price volatility;

•lack of publicly available information, including reports of payments of dividends or interest on outstanding securities;

•foreign government policies that may restrict opportunities, including restrictions on investment in issuers or industries deemed sensitive to national interests;

•relatively new capital market structure or market-oriented economy;

•the possibility that recent favorable economic developments may be slowed or reversed by unanticipated political or social events in these countries;

•restrictions that may make it difficult or impossible for a fund to vote proxies, exercise shareholder rights, pursue legal remedies, and obtain judgments in foreign courts; and

•possible losses through the holding of securities in domestic and foreign custodial banks and depositories.

In addition, many developing markets have experienced substantial and, in some periods, extremely high rates of inflation for many years. Inflation and rapid fluctuations in inflation rates have had and may continue to have negative effects on the economies, currencies, interest rates, and securities markets of those markets.

Repatriation of investment income, capital, and proceeds of sales by foreign investors may require governmental registration and/or approval in some developing markets. A fund could be adversely affected by delays in or a refusal to grant any required governmental registration or approval for repatriation.

Further, the economies of developing markets generally are heavily dependent upon international trade and, accordingly, have been and may continue to be adversely affected by trade barriers, exchange controls, managed adjustments in relative currency values and other protectionist measures imposed or negotiated by the countries with which they trade.

The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors, including instances of fraud in emerging markets. For example, in certain emerging markets, there are significant legal obstacles to obtaining information needed for investigations or litigation.

Similar limitations apply to the pursuit of actions against individuals, including officers, who may have engaged in fraud or wrongdoing. In addition, local authorities often are constrained in their ability to assist U.S. authorities and overseas investors more generally. There are also legal or other obstacles to seeking access to funds in a foreign country.

Equity Securities

Equity securities include common stocks, some convertible securities, preferred stock, depositary receipts, rights (an offering of common stock to investors who currently own shares which entitle them to buy subsequent issues at a discount from the offering price), and warrants (the right to purchase securities from the issuer at a specified price, normally higher than the current market price). Common stocks, the most familiar type, represent an equity (ownership) interest in a corporation. The value of a company's stock may fall as a result of factors directly relating to that company, such as decisions made by its management or lower demand for the company's products or services. A stock's value may also fall because of factors affecting not just the company, but also companies in the same industry or in a number of different industries, such as increases in production costs. The value of a company's stock may also be affected by changes in financial markets that are relatively unrelated to the company or its industry, such as changes in interest rates or currency exchange rates. In addition, a company's stock generally pays dividends only after the company invests in its own business and makes required payments to holders of its bonds and other debt. For this reason, the value of a company's stock will usually react more strongly than its bonds and other debt to actual or perceived changes in the company's financial condition or prospects.

Some funds focus their investments on certain market capitalization ranges. Market capitalization is defined as total current market value of a company's outstanding equity securities. The market capitalization of companies in a fund’s portfolios and their related indexes will change over time, and, except to the extent consistent with its principal investment strategies (for example, for an index fund that uses a replication strategy), a fund will not automatically sell a security just because it falls outside of the market capitalization range of its index(es).

Growth Style

The prices of growth stocks may be based largely on expectations of future earnings, and their prices can decline rapidly and significantly in reaction to negative news about such factors as earnings, revenues, the economy, political developments, or other news. Growth stocks may underperform value stocks and stocks in other broad style categories (and the stock market as a whole) over any period of time and may shift in and out of favor with investors generally, sometimes rapidly, depending on changes in market, economic, and other factors. As a result, a fund that holds substantial investments in growth stocks may underperform other funds that invest more broadly or favor different investment styles. Because growth companies typically reinvest their earnings, growth stocks typically do not pay dividends at levels associated with other types of stocks, if at all.

Smaller Companies

Investments in companies with smaller market capitalizations may involve greater risks and price volatility (wide, rapid fluctuations) than investments in larger, more mature companies. Small company stocks may decline in price as large company stocks rise, or rise in price while larger company stocks decline. The net asset value of a fund that invests a substantial portion of its assets in small company stocks may therefore be more volatile than the shares of a fund that invests solely in larger company stocks. Small companies may be less significant within their industries and may be at a competitive disadvantage relative to their larger competitors. Smaller companies may be less mature than larger companies. At this earlier stage of development, the companies may have limited product lines, reduced market liquidity for their shares, limited financial resources, or less depth in management than larger or more established companies. While smaller companies may be subject to these additional risks, they may also realize more substantial growth than larger or more established companies.

Unseasoned issuers are companies with a record of less than three years continuous operation, including the operation of predecessors and parents. Many unseasoned issuers also may be small companies and involve the risks and price volatility associated with smaller companies. Unseasoned issuers by their nature have only a limited operating history that can be used for evaluating the company's growth prospects. As a result, these securities may place a greater emphasis on current or planned product lines and the reputation and experience of the company's management and less emphasis on fundamental valuation factors than would be the case for more mature growth companies.

Value Style

Value stocks present the risk that they may decline in price or never reach their expected full market value because the market fails to recognize the stock's intrinsic worth. Value stocks may underperform growth stocks and stocks in other broad style categories (and the stock market as a whole) over any period of time and may shift in and out of favor with investors generally, sometimes rapidly, depending on changes in market, economic, and other factors. As a result, a fund that holds substantial investments in value stocks may underperform other funds that invest more broadly or favor different investment styles.

Fixed-Income Securities

Fixed-income securities include bonds and other debt instruments that are used by issuers to borrow money from investors (examples include corporate bonds, convertible securities, asset- and mortgage-backed securities, and municipal, agency, and U.S. government securities). The issuer of a fixed-income security generally pays the investor a fixed, variable, or floating rate of interest. The amount borrowed must be repaid at maturity. Some debt securities, such as zero coupon bonds, do not pay current interest, but are sold at a discount from their face values.

Fixed-income securities are sensitive to changes in interest rates. In general, fixed-income security prices rise when interest rates fall and fall when interest rates rise. An increase in interest rates from a low interest rate environment may lead to heightened volatility and redemptions alongside reduced liquidity and dealer market-making capacity in fixed income markets. If interest rates fall, issuers of callable bonds may call (repay) securities with high interest rates before their maturity dates; this is known as call risk. In this case, a fund would likely reinvest the proceeds from these securities at lower interest rates, resulting in a decline in the fund's income. Very low interest rates, including rates that fall below zero (where banks charge for depositing money), may detract from a Fund’s performance and its ability to maintain positive returns to the extent the Fund is exposed to such interest rates. To the extent a Fund holds an investment with a negative interest rate to maturity, the Fund would generate a negative return on that investment. Floating rate securities generally are less sensitive to interest rate changes but may decline in value if their interest rates do not rise as much, or as quickly, as interest rates in general. Conversely, floating rate securities will not generally increase in value if interest rates decline.

The United Kingdom’s Financial Conduct Authority, which regulates the London Inter-bank Offered Rate (“LIBOR”), will no longer publish non-U.S. dollar LIBOR, 1-week U.S. dollar LIBOR, or 2-month U.S. dollar LIBOR rates after December 31, 2021. The remaining, most widely used U.S. dollar LIBOR rates will no longer be published after June 30, 2023. There remains uncertainty regarding the future utilization of LIBOR and the nature of a replacement rate and, as a result, the potential effect of a transition away from LIBOR on a fund or certain of its investments cannot be determined. LIBOR’s discontinuation and replacement could lead to short-term and long-term uncertainty, market instability, and adverse impacts to newly issued and existing financial instruments that reference LIBOR. While some instruments may contemplate the discontinuation of LIBOR by providing for an alternative rate-setting methodology, not all instruments may have such provisions and there is uncertainty regarding the effectiveness of any alternative methodology. In addition, LIBOR’s discontinuation or replacement may affect the value, liquidity, or return on certain Fund investments and may result in costs in connection with closing out positions and entering into new trades. These risks are likely to persist until new reference rates and fallbacks for both legacy and new instruments and contracts are commercially accepted and market practices become settled.

The U.S. Federal Reserve, along with a steering committee comprised of large U.S. financial institutions known as the Alternative Reference Rates Committee, intends to replace U.S. dollar LIBOR with the Secured Overnight Financing Rate (“SOFR”), a new index calculated by short-term repurchase agreements, backed by Treasury securities. Bank working groups and regulators in other countries have suggested other alternatives for their markets.

Fixed-income securities are also affected by the credit quality of the issuer. Investment grade debt securities are medium and high quality securities. Some bonds, such as lower grade or "junk" bonds, may have speculative characteristics and may be particularly sensitive to economic conditions and the financial condition of the issuers. Credit risk refers to the possibility that the issuer of the security will not be able to make principal and interest payments when due.

Additionally, a Fund's investments in companies with smaller market capitalizations may involve greater risks, price volatility (wide, rapid fluctuations), and less liquidity than investments in larger, more mature companies.

Foreign Currency

Certain of a Fund's investments will be denominated in foreign currencies or traded in securities markets in which settlements are made in foreign currencies. Any income on such investments is generally paid to a fund in foreign currencies. In addition, funds may engage in foreign currency transactions for both hedging and investment purposes, as well as to increase exposure to a foreign currency or to shift exposure to foreign currency fluctuations from one country to another.

The value of foreign currencies relative to the U.S. dollar varies continually, causing changes in the dollar value of a fund’s portfolio investments (even if the local market price of the investments is unchanged) and changes in the dollar value of a fund’s income available for distribution to its shareholders. The effect of changes in the dollar value of a foreign currency on the dollar value of a fund’s assets and on the net investment income available for distribution may be favorable or unfavorable. Transactions in non-U.S. currencies are also subject to many of the risks of investing in foreign (non-U.S.) securities; for example, changes in foreign economies and political climates are more likely to affect a fund that has foreign currency exposure than a fund that invests exclusively in U.S. companies and currency. There also may be less government supervision of foreign markets, resulting in non-uniform accounting practices and less publicly available information. Transactions in foreign currencies, foreign currency denominated debt and certain foreign currency options, futures contracts and forward contracts (and similar instruments) may give rise to ordinary income or loss to the extent such income or loss results from fluctuations in the value of the foreign currency concerned.

A fund may incur costs in connection with conversions between various currencies. In addition, a fund may be required to liquidate portfolio assets, or may incur increased currency conversion costs, to compensate for a decline in the dollar value of a foreign currency occurring between the time when a fund declares and pays a dividend, or between the time when a fund accrues and pays an operating expense in U.S. dollars. To protect against a change in the foreign currency exchange rate between the date on which a fund contracts to purchase or sell a security and the settlement date for the purchase or sale, to gain exposure to one or more foreign currencies or to "lock in" the equivalent of a dividend or interest payment in another currency, a fund might purchase or sell a foreign currency on a spot (i.e., cash) basis at the prevailing spot rate.

Currency hedging involves some of the same general risks and considerations as other transactions with similar instruments (i.e., derivative instruments) and hedging. Currency transactions are also subject to additional risks. Because currency control is of great importance to the issuing governments and influences economic planning and policy, purchases and sales of currency and related instruments can be adversely affected by government exchange controls, limitations or restrictions on repatriation of currency, and manipulations or exchange restrictions imposed by governments. These forms of governmental actions can result in losses to a fund if it is unable to deliver or receive currency or monies in settlement of obligations. They could also cause hedges the fund has entered into to be rendered useless, resulting in full currency exposure as well as incurring transaction costs. Settlement of a currency forward contract for the purchase of most currencies must occur at a bank based in the issuing nation. The ability to establish and close out positions on trading options on currency futures contracts is subject to the maintenance of a liquid market that may not always be available.

Foreign Securities

The Funds consider a security to be tied economically to countries outside the U.S. (a “foreign security”) if the issuer of the security has its principal place of business or principal office outside the U.S., has its principal securities trading market outside the U.S., or derives a majority of its revenue from outside the U.S.

There may be less publicly available information about foreign companies than U.S. companies, and information about foreign securities in which the Funds invest may be less reliable or complete. Foreign companies, including those listed on U.S. securities exchanges, may not be subject to the same uniform accounting, auditing, and financial reporting practices as are required of U.S. companies with respect to such matters as insider trading rules, tender offer regulation, accounting standards or auditor oversight, stockholder proxy requirements and the requirements mandating timely and accurate disclosure of information. For example, the Chinese government has taken positions that prevent the Public Company Accounting Oversight Board from inspecting the audit work and practices of accounting firms in mainland China and Hong Kong for compliance with U.S. law and professional standards. In addition, securities of many foreign companies are less liquid and more volatile than securities of comparable U.S. companies. Commissions on foreign securities exchanges may be generally higher than those on U.S. exchanges.

Foreign markets also have different clearance and settlement procedures than those in U.S. markets. In certain markets, there have been times when settlements have been unable to keep pace with the volume of securities transactions, making it difficult to conduct these transactions. Delays in settlement could result in temporary periods when a portion of Fund assets is not invested and earning no return. If the Fund is unable to make intended security purchases due to settlement problems, the Fund may miss attractive investment opportunities. In addition, the Fund may incur a loss as a result of a decline in the value of its portfolio if it is unable to sell a security.

With respect to certain foreign countries, there is the possibility of nationalization, expropriation or confiscatory taxation, political or social instability, or diplomatic developments that could affect the Fund's investments in those countries. In addition, the Fund may also suffer losses due to differing accounting practices and treatments. Investments in foreign securities are subject to laws of the foreign country that may limit the amount and types of foreign investments. Changes of governments or of economic or monetary policies, in the U.S. or abroad, changes in dealings between nations, currency convertibility or exchange rates could result in investment losses for the Fund.

Foreign securities are often traded with less frequency and volume, and therefore may have greater price volatility than is the case with many U.S. securities. Brokerage commissions, custodial services, and other costs relating to investment in foreign countries are generally more expensive than in the U.S. Though the Fund intends to acquire the securities of foreign issuers where there are public trading markets, economic or political turmoil in a country in which the Fund has a significant portion of its assets or deterioration of the relationship between the U.S. and a foreign country may reduce the liquidity of the Fund's portfolio, and the Fund may have difficulty meeting a large number of redemption requests. Furthermore, there may be difficulties in obtaining or enforcing judgments against foreign issuers.

A fund may invest in a foreign company by purchasing depositary receipts. Depositary receipts are certificates of ownership of shares in a foreign-based issuer held by a bank or other financial institution. They are alternatives to purchasing the underlying security but are subject to the foreign securities risks to which they relate.

A fund may file claims to recover foreign withholding taxes on dividend and interest income (if any) received from issuers in certain countries and capital gains on the disposition of stocks or securities where such withholding tax reclaim is possible. Whether or when a fund will receive a withholding tax refund is within the control of the tax authorities in such countries. Where a fund expects to recover withholding taxes, the net asset value of a fund generally includes accruals for such tax refunds. If the likelihood of recovery materially decreases, accruals in the fund’s net asset value for such refunds may be written down partially or in full, which will adversely affect the fund’s net asset value. Shareholders in the fund at the time an accrual is written down will bear the impact of the resulting reduction in net asset value regardless of whether they were shareholders during the accrual period. Conversely, if a fund receives a tax refund that has not been previously accrued, shareholders in the fund at the time of the successful recovery will benefit from the resulting increase in the fund’s net asset value. Shareholders who sold their shares prior to such time will not benefit from such increase in the fund’s net asset value

If a fund's portfolio invests significantly in a certain geographic region, any negative development affecting that region will have a greater impact on the fund than a fund that is not as heavily invested in that region. For example, with respect to funds that invest significantly in China or the EU:

•Investing in China involves certain heightened risks and considerations including, among others: frequent trading suspensions and government interventions (including by nationalizing assets); currency exchange rate fluctuations or blockages; limits on using brokers and on foreign ownership; different financial reporting standards, as described above; higher dependence on exports and international trade; political and social instability; infectious disease outbreaks; regional and global conflicts; increased trade tariffs, embargoes and other trade limitations; custody and other risks associated with programs used to access Chinese securities; and uncertainties in tax rules that could result in unexpected tax liabilities for the Fund. Significant portions of the Chinese securities markets may become rapidly illiquid, as Chinese issuers have the ability to suspend the trading of their equity securities. Moreover, actions by the U.S. government, such as delisting of certain Chinese companies from U.S. securities exchanges or otherwise restricting their operations in the U.S., may negatively impact the value of such securities held by the funds.

•Funds that invest in the United Kingdom (the "UK") face risks related to the UK's departure from the European Union (the “EU”), commonly known as “Brexit.” Brexit has resulted in significant uncertainties and instability in the financial markets, and considerable uncertainty remains related to the potential consequences associated with the exit, how the negotiations for the withdrawal and new trade agreements will be conducted, and whether the UK's exit will increase the likelihood of other countries also departing the EU. Brexit may have significant political and financial consequences in the UK, as well as in European markets and the broader global economy, which may result in increased volatility and illiquidity, and potentially lower economic growth in markets in the UK, Europe and globally.

Hedging

Hedging is a strategy that can be used to attempt to mitigate or protect against potential losses due to changing interest rates, securities prices, asset values, currency exchange rates, and other market conditions. The success of a Fund’s hedging strategy will be subject to the ability of those managing the Fund's investments to correctly assess the degree of correlation between the performance of the instruments used in the hedging strategy and the performance of the investments in the portfolio being hedged. Since the characteristics of many securities change as markets change or time passes, the success of the Fund’s hedging strategy will also be subject to the ability of those managing the Fund's investments to continually recalculate, readjust, and execute hedges in an efficient and timely manner. For a variety of reasons, those managing the Fund's investments may not seek to establish a perfect correlation between such hedging instruments and the portfolio holdings being hedged. Such imperfect correlation may prevent the Fund from achieving the intended hedge or expose the Fund to risk of loss. In addition, it is not possible to hedge fully or perfectly against any risk, and hedging entails its own costs.

High Portfolio Turnover

"Portfolio Turnover" is the term used in the industry for measuring the amount of trading that occurs in a fund's portfolio during the year. For example, a 100% turnover rate means that on average every security in the portfolio has been replaced once during the year. Funds with high turnover rates (more than 100%) often have higher transaction costs (which are paid by the Fund) that may lower the Fund's performance. High portfolio turnover can result in a lower capital gain distribution due to higher transaction costs added to the basis of the assets or can result in lower ordinary income distributions to shareholders when the transaction costs cannot be added to the basis of assets. Both events reduce fund performance.

Please consider all the factors when you compare the turnover rates of different funds. You should also be aware that the "total return" line in the Financial Highlights section reflects portfolio turnover costs.

High Yield Securities

Below investment grade securities are fixed income securities that are rated at the time of purchase Ba1 or lower by Moody's Investors Service, Inc. ("Moody's") and BB+ or lower by S&P Global Ratings ("S&P Global") (if the security has been rated by only one of those agencies, that rating will determine if the security is below investment grade; if the security has not been rated by either of those agencies, those managing investments of a Fund will determine whether the security is of a quality comparable to those rated below investment grade). Below investment grade securities are sometimes referred to as high yield or "junk bonds" and are considered speculative, particularly with respect to the issuer's continuing ability to meet principal and interest payments. Such securities could be in default at time of purchase.

Investing in high yield securities involves special risks in addition to those associated with investing in investment grade securities.

•High yield securities may be less liquid than investment grade securities.

•The secondary market on which high yield securities are traded may be less liquid, which may reduce the price of the security and adversely affect and cause large fluctuations in the daily price of the Fund's shares.

•Analysis of the creditworthiness of issuers of high yield securities is more complex. To the extent a Fund invests in high yield securities, its ability to meet its objective may be more dependent on such credit analyses.

•High yield securities may be more susceptible to real or perceived adverse economic and competitive industry conditions. Although high yield securities prices tend to be less sensitive to interest rate changes than those of investment grade securities, they tend to be more sensitive to adverse economic downturns or individual corporate developments. Adverse publicity and investor perceptions, whether or not based on fundamental analysis, may decrease the value and liquidity of high yield securities, especially in a thinly traded market.

•If the issuer of high yield securities defaults, a Fund may incur additional expenses to seek recovery.

•If an issuer of high yield securities undergoes a corporate restructuring, such high yield securities may become exchanged for or converted into reorganized equity of the underlying issuer. Moreover, to the extent that a bond indenture or loan agreement does not contain sufficiently protective covenants or otherwise permits the issuer to take certain actions to the Fund's detriment (such as distributing cash to equity holders, incurring additional indebtedness, and disposing of assets), the underlying value of the high yield security may decline.

The use of credit ratings for evaluating high yield securities also involves certain risks. For example, credit ratings reflect the safety of principal and interest payments, not the market value risk of high yield securities. Also, credit

rating agencies may fail to change credit ratings in a timely manner to reflect subsequent events. If a credit rating agency changes the rating of a portfolio security held by a Fund, the Fund may retain the security.

Industry Concentration

A fund that concentrates its investments (invests more than 25% of its net assets) in a particular industry (or group of industries) is more exposed to the overall condition of the particular industry than a fund that invests in a wider variety of industries. A particular industry could be affected by economic, business, supply-and-demand, political, or regulatory factors. Companies within the same industry could react similarly to such factors. As a result, a fund’s concentration in a particular industry would increase the possibility that the fund’s performance will be affected by such factors.

Investment Company Securities

Securities of other investment companies, including shares of closed-end investment companies, unit investment trusts, various exchange-traded funds ("ETFs"), and other open-end investment companies, represent interests in professionally managed portfolios that may invest in a variety of instruments. Certain types of investment companies, such as closed-end investment companies, issue a fixed number of shares that trade on a stock exchange or over-the-counter at a premium or a discount to their net asset value. Others are continuously offered at net asset value, but may also be traded in the secondary market. ETFs are often structured to perform in a similar fashion to a broad-based securities index. Investing in ETFs involves generally the same risks as investing directly in the underlying instruments. Investing in ETFs involves the risk that they will not perform in exactly the same fashion, or in response to the same factors, as the index or underlying instruments. Shares of ETFs may trade at prices other than NAV.

A fund that invests in another investment company is subject to the risks associated with direct ownership of the securities in which such investment company invests. Fund shareholders indirectly bear their proportionate share of the expenses of each such investment company, including its advisory and administrative fees. The Fund would also continue to pay its own advisory fees and other expenses. Consequently, the Fund and its shareholders would, in effect, absorb two levels of fees with respect to investments in other investment companies.

A fund may invest in affiliated underlying funds, and those who manage such fund's investments and their affiliates may earn different fees from different underlying funds and may have an incentive to allocate more fund assets to underlying funds from which they receive higher fees.

Leverage

If a fund makes investments in futures contracts, forward contracts, swaps and other derivative instruments, these instruments provide the economic effect of financial leverage by creating additional investment exposure, as well as the potential for greater loss. If a fund uses leverage through activities such as borrowing, entering into short sales, purchasing securities on margin or on a “when-issued” basis or purchasing derivative instruments in an effort to increase its returns, the fund has the risk of magnified capital losses that occur when losses affect an asset base, enlarged by borrowings or the creation of liabilities, that exceeds the net assets of the fund. The net asset value of a fund employing leverage will be more volatile and sensitive to market movements. Leverage may involve the creation of a liability that requires the fund to pay interest. Leveraging may cause a fund to liquidate portfolio positions to satisfy its obligations or to meet segregation requirements when it may not be advantageous to do so. To the extent that a fund is not able to close out a leveraged position because of market illiquidity, a fund’s liquidity may be impaired to the extent that it has a substantial portion of liquid assets segregated or earmarked to cover obligations.

Market Trading Risks

The net asset value ("NAV") of the Shares generally will fluctuate with changes in the market value of each Fund's holdings. The market prices of the Shares generally will fluctuate in accordance with changes in NAV, as well as the relative supply of and demand for Shares on the respective exchanges, PGI cannot predict whether the Shares will trade below, at or above their NAV. Price differences may be due largely to the fact that supply and demand forces at work in the secondary trading market for the Shares will be related, but not identical, to the forces influencing the prices of the securities held by the Fund (individually or in the aggregate) at any time.

Only authorized participants ("APs") may engage in creation or redemption transactions directly with each Fund. (See "Purchase and Sale of Fund Shares-Generally.") The Fund has a limited number of institutions that may act as APs, none of which are or will be obligated to engage in creation or redemption transactions. To the extent that these institutions exit the business or are unable or unwilling to proceed with creation and/or redemption orders with respect to the Fund, and no other AP is able or willing to step forward to create or redeem Creation Units, Fund shares may trade at a discount to NAV and possibly face trading halts and/or delisting. Such disruptions to creations and redemptions or the existence of extreme market volatility may result in trading prices that differ significantly from NAV.

With respect to funds that invest in foreign securities, since foreign exchanges may be open on days when such a fund does not price its shares, the value of the fund’s portfolio may change on days when shareholders will not be

able to purchase or sell the fund’s Shares, and may result in trading prices that differ significantly from NAV. Additionally, such funds may be subject to heightened risks since APs may be required to post collateral with such investments, which only certain APs are able to do. Moreover, to the extent that an AP is unable or unwilling to trade on an agency basis for foreign securities, there could be a diminished trading market for ETF shares, and shares may trade at a discount to NAV.

If a shareholder purchases at a time when the market price is at a premium to the NAV or sells at a time when the market price is at a discount to the NAV, the shareholder may sustain losses. Given that Shares can be created and redeemed only in Creation Units at NAV, PGI believes that large discounts and premiums should not be sustained over the long term.

Master Limited Partnerships (MLPs)

An MLP that invests in a particular industry (e.g., oil and gas) will be harmed by detrimental economic events within that industry. For example, the business of certain MLPs is affected by supply and demand for energy commodities because such MLPs derive revenue and income based upon the volume of the underlying commodity produced, transported, processed, distributed, and/or marketed. Many MLPs are also subject to various federal, state and local environmental laws and health and safety laws as well as laws and regulations specific to their particular activities.

MLPs tend to pay relatively higher distributions than other types of companies. The amount of cash that an MLP can distribute to its partners will depend on the amount of cash it generates from operations, which will vary from quarter to quarter depending on factors affecting the market generally and on factors affecting the particular business lines of the MLP. Available cash will also depend on the MLPs' level of operating costs (including incentive distributions to the general partner), level of capital expenditures, debt service requirements, acquisition costs (if any), fluctuations in working capital needs and other factors.

Certain benefits derived from investment in MLPs depend largely on the MLPs being treated as partnerships for federal income tax purposes. As a partnership, an MLP has no federal income tax liability at the entity level. MLPs taxed as partnerships file a partnership tax return for U.S. federal, state, and local income tax purposes and communicate the Fund's allocable share of the MLP's income, gains, losses, deductions, and expenses via a "Schedule K-1." Each year, the Fund will send you an annual tax statement (Form 1099) to assist you in completing your tax returns. In some circumstances the Fund may need to send you a corrected Form 1099, which could require you to amend your tax returns. For example, if the Fund keeps MLP investments until the basis (generally the price paid for the units, as adjusted downwards with each distribution and allocation of deductions and losses, and upwards with each allocation of taxable income and gain) is zero, subsequent distributions will be taxable to the Fund at ordinary income rates and shareholders may receive a corrected Form 1099.

If, as a result of a change in current law or a change in an MLP's business, an MLP was treated as a corporation for federal income tax purposes, the MLP would be obligated to pay federal income tax on its income at the corporate tax rate. If an MLP was classified as a corporation for federal income tax purposes, the amount of cash available for distribution would be reduced and the distributions received might be taxed entirely as dividend income.

Momentum Style

Investing in or having exposure to securities with positive momentum entails investing in securities that have had above-average recent returns. These securities may be more volatile than a broad cross-section of securities. Returns on securities that have previously exhibited momentum may be less than returns on other styles of investing or the overall stock market. Momentum can turn quickly and cause significant variation from other types of investments, and stocks that previously exhibited high momentum may not experience continued positive momentum. In addition, there may be periods when the momentum style is out of favor, and during which the investment performance of the Fund using a momentum strategy may suffer.

Portfolio Duration

Average duration is a mathematical calculation of the average life of a bond (or for a bond fund, the average life of the fund's underlying bonds, weighted by the percentage of the fund's assets that each represents) that serves as a useful measure of its price risk. Duration is an estimate of how much the value of the bonds held by a fund will fluctuate in response to a change in interest rates. For example, if a fund has an average duration of 4 years and interest rates rise by 1%, the value of the bonds held by the fund will decline by approximately 4%, and if the interest rates decline by 1%, the value of the bonds held by the fund will increase by approximately 4%. Longer term bonds and zero coupon bonds are generally more sensitive to interest rate changes. Duration, which measures price sensitivity to interest rate changes, is not necessarily equal to average maturity.

Preferred Securities

Preferred securities include preferred stock and various types of junior subordinated debt and trust preferred securities. Preferred securities may pay fixed rate or adjustable rate distributions and generally have a payment

"preference" over common stock, but are junior to the issuer's senior debt in a liquidation of the issuer’s assets. Preference would mean that a company must pay on its preferred securities before paying on its common stock, and that any claims of the preferred security holder would typically be ahead of common stockholders' claims on assets in a corporate liquidation.

Holders of preferred securities usually have no right to vote for corporate directors or on other matters. The market value of preferred securities is sensitive to changes in interest rates as they are typically fixed income securities; the fixed-income payments are expected to be the primary source of long-term investment return. While some preferred securities are issued with a final maturity date, others are perpetual in nature. In certain instances, a final maturity date may be extended and/or the final payment of principal may be deferred at the issuer’s option for a specified time without triggering an event of default for the issuer. In addition, an issuer of preferred securities may have the right to redeem the securities before their stated maturity date. For instance, for certain types of preferred securities, a redemption may be triggered by a change in federal income tax or securities laws. As with call provisions, a redemption by the issuer may reduce the return of the security held by the fund. Preferred securities may be subject to provisions that allow an issuer, under certain circumstances to skip (indefinitely) or defer (possibly up to 10 years) distributions. If a fund owns a preferred security that is deferring its distribution, the fund may be required to report income for tax purposes while it is not receiving any income.

Preferred securities are typically issued by corporations, generally in the form of interest or dividend bearing instruments, or by an affiliated business trust of a corporation, generally in the form of beneficial interests in subordinated debentures or similarly structured securities. The preferred securities market is generally divided into the $25 par “retail” and the $1,000 par “institutional” segments. The $25 par segment includes securities that are listed on the New York Stock Exchange (exchange traded), which trade and are quoted with accrued dividend or interest income, and which are often callable at par value five years after their original issuance date. The institutional segment includes $1,000 par value securities that are not exchange-listed (over the counter), which trade and are quoted on a “clean” price, i.e., without accrued dividend or interest income, and which often have a minimum of 10 years of call protection from the date of their original issuance. Preferred securities can also be issued by real estate investment trusts and involve risks similar to those associated with investing in real estate investment trust companies.

Real Estate Investment Trusts ("REITs")

REITs involve certain unique risks in addition to the risks associated with investing in the real estate industry in general (such as possible declines in the value of real estate, lack of availability of mortgage funds, or extended vacancies of property). REITs are characterized as: equity REITs, which primarily own property and generate revenue from rental income; mortgage REITs, which invest in real estate mortgages; and hybrid REITs, which combine the characteristics of both equity and mortgage REITs. Equity REITs may be affected by changes in the value of the underlying property owned by the REITs, while mortgage REITs may be affected by the quality of any credit extended. REITs are dependent upon management skills, are not diversified, and are subject to heavy cash flow dependency, risks of default by borrowers, and self-liquidation. A fund that invests in a REIT is subject to the REIT’s expenses, including management fees, and will remain subject to the fund's advisory fees with respect to the assets so invested. REITs are also subject to the possibilities of failing to qualify for the special tax treatment accorded REITs under the Internal Revenue Code, and failing to maintain their exemptions from registration under the 1940 Act.

Regular REIT dividends received by a Fund from a REIT will not qualify for the corporate dividends-received deduction and generally will not constitute qualified dividend income for U.S. income tax purposes. Any distribution of income attributable to regular REIT dividends from a Fund’s investment in a REIT will not qualify for the deduction that would be available to a non-corporate shareholder were the shareholder to own such REIT directly.

Investment in REITs also involves risks similar to those associated with investing in small market capitalization companies. REITs may have limited financial resources, may trade less frequently and in a limited volume, and may be subject to more abrupt or erratic price movements than larger company securities.

Real Estate Securities

Investing in securities of companies in the real estate industry subjects a fund to the special risks associated with the real estate market and the real estate industry in general. Generally, companies in the real estate industry are considered to be those that have principal activity involving the development, ownership, construction, management or sale of real estate; have significant real estate holdings, such as hospitality companies, healthcare facilities, supermarkets, mining, lumber and/or paper companies; and/or provide products or services related to the real estate industry, such as financial institutions that make and/or service mortgage loans and manufacturers or distributors of building supplies. Securities of companies in the real estate industry are sensitive to factors such as loss to casualty or condemnation, changes in real estate values, property taxes, interest rates, cash flow of underlying real estate assets, occupancy rates, government regulations affecting zoning, land use and rents, and the management skill and

creditworthiness of the issuer. Companies in the real estate industry may also be subject to liabilities under environmental and hazardous waste laws.

Redemption and Large Transaction Risk

Ownership of a fund's shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause a fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains.

As an example, as of June 30, 2021, Principal Funds, Inc. ("PFI") and Principal Variable Contracts Funds, Inc. ("PVC") funds of funds owned the following percentages, in the aggregate, of the outstanding shares of the underlying funds listed below. Principal Global Investors, LLC ("PGI") is the advisor to the PFI and PVC funds of funds and is committed to minimizing the potential impact of redemption and large transaction risk on underlying funds to the extent consistent with pursuing the investment objectives of the funds of funds that it manages. However, PGI and its affiliates may face conflicts of interest in fulfilling responsibilities to all such funds.


Fund			Total Percentage of Outstanding Shares Owned
Principal U.S. Mega-Cap ETF			88.04%
Principal U.S. Small-Cap Multi-Factor ETF			95.24%

Purchases and redemptions of creation units primarily with cash rather through in kind delivery of portfolio securities may cause the ETF to incur certain costs, such as brokerage costs or taxable gains or losses that it might not have incurred if it had made redemption in kind. These costs could be imposed on the ETF and thus decrease its NAV to the extent that the costs are not offset by a transaction fee payable by an authorized participant.

Securitized Products

Securitized products are fixed income instruments that represent interests in underlying pools of collateral or assets. The value of the securitized product is derived from the performance, value, and cash flows of the underlying asset(s). A fund’s investments in securitized products are subject to risks similar to traditional fixed income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Prepayment risk may make it difficult to calculate the average life of a fund’s investment in securitized products. Securitized products are generally issued as pass-through certificates, which represent the right to receive principal and interest payments collected on the underlying pool of assets, which are passed through to the security holder. Therefore, repayment depends on the cash flows generated by the underlying pool of assets. The securities may be rated as investment-grade or below-investment-grade.

The specific securitized products that are principal strategies of each Fund are listed in its Fund Summary.

•Mortgage-backed securities (“MBS”) represent an interest in a pool of underlying mortgage loans secured by real property. MBS are sensitive to changes in interest rates, but may respond to these changes differently from other fixed income securities due to the possibility of prepayment of the underlying mortgage loans. If interest rates fall and the underlying loans are prepaid faster than expected, the fund may have to reinvest the prepaid principal in lower yielding securities, thus reducing the fund’s income. Conversely, rising interest rates tend to discourage refinancings and the underlying loans may be prepaid more slowly than expected, reducing a fund’s potential to reinvest the principal in higher yielding securities and extending the duration of the underlying loans. In addition, when market conditions result in an increase in default rates on the underlying loans and the foreclosure values of the underlying real estate is less than the outstanding amount due on the underlying loan, collection of the full amount of accrued interest and principal on these investments may be doubtful. The risk of such defaults is generally higher in the case of underlying mortgage pools that include sub-prime mortgages (mortgages granted to borrowers whose credit histories would not support conventional mortgages).

•Commercial mortgage-backed securities (“CMBS”) represent an interest in a pool of underlying commercial mortgage loans secured by real property such as retail, office, hotel, multi-family, and industrial properties. Certain CMBS are issued in several classes with different levels of yield and credit protection, and the CMBS class in which a fund invests usually influences the interest rate, credit, and prepayment risks.

•Asset-backed securities (“ABS”) are backed by non-mortgage assets such as company receivables, truck and auto loans, student loans, leases and credit card receivables. ABS entail credit risk. They also may present a risk that, in the event of default, the liquidation value of the underlying assets may be inadequate to pay any unpaid interest or principal.

U.S. Government and U.S. Government-Sponsored Securities

U.S. Government securities, such as Treasury bills, notes and bonds and mortgage-backed securities guaranteed by the Government National Mortgage Association ("Ginnie Mae"), are supported by the full faith and credit of the United States; others are supported by the right of the issuer to borrow from the U.S. Treasury; others are supported by the discretionary authority of the U.S. Government to purchase the agency's obligations; and still others are supported only by the credit of the issuing agency, instrumentality, or enterprise.

Although U.S. Government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation ("Freddie Mac") and the Federal National Mortgage Association ("Fannie Mae") may be chartered or sponsored by Congress, they are not funded by Congressional appropriations, and their securities are not issued by the U.S. Treasury nor supported by the full faith and credit of the U.S. Government.

There is no assurance that the U.S. Government would provide financial support to its agencies and instrumentalities if not required to do so. In addition, certain governmental entities have been subject to regulatory scrutiny regarding their accounting policies and practices and other concerns that may result in legislation, changes in regulatory oversight and/or other consequences that could adversely affect the credit quality, availability, or investment character of securities issued by these entities. The value and liquidity of U.S. Government securities may be affected adversely by changes in the ratings of those securities.

PORTFOLIO HOLDINGS INFORMATION

A description of the Fund's policies and procedures with respect to disclosure of the Fund's portfolio securities is available in the Fund's Statement of Additional Information ("SAI").

MANAGEMENT OF THE FUNDS

The Manager and Advisor

Principal Global Investors, LLC (“PGI”), an indirect subsidiary of Principal Financial Group, Inc. (“Principal®”), serves as the manager and advisor for the Fund. Through the Management Agreement with the Fund, PGI provides investment advisory services and certain corporate administrative services for the Fund.

Advisor: Principal Global Investors, LLC ("PGI"), 711 High Street, Des Moines, IA 50392, is part of a diversified global asset management organization which utilizes a multi-boutique strategy of specialized investment groups and affiliates to provide institutional investors and individuals with diverse investment capabilities, including fixed income, equities, real estate, currency, asset allocation and stable value. In addition to its asset management offices in the U.S., PGI has asset management offices of affiliate advisors located in Europe, Asia, Latin America and Australia. PGI has been an investment advisor since 1998.

Funds: In fulfilling its investment advisory responsibilities, PGI provides the day-to-day discretionary investment services (directly making decisions to purchase or sell securities) for each Fund. For some Funds, these services are provided by the sub-advisor, as described below.

Portfolio Managers

As reflected in the Fund Summaries, the day-to-day portfolio management for each Fund is shared by multiple portfolio managers. Except as described below, the portfolio managers operate as a team, sharing authority and responsibility for research and the day-to-day management of the Fund's portfolio with no limitation on the authority of one portfolio manager in relation to another.

Each Fund summary identifies the portfolio managers of the Fund. Additional information about the portfolio managers follows. References to Principal® include the entire Principal organization. The SAI provides additional information about each portfolio manager’s compensation, other accounts the portfolio managers manage, and each portfolio manager’s ownership of securities in the Fund.

Jeffrey A. Schwarte has been with Principal® since 1993. He earned a bachelor’s degree in Accounting from the University of Northern Iowa. Mr. Schwarte has earned the right to use the Chartered Financial Analyst designation.

Aaron J. Siebel has been with Principal® since 2005. He earned a bachelor’s degree in Finance from the University of Iowa.

Participating Affiliate Agreement

In rendering investment advisory services to a Fund, the advisor and each sub-advisor may use the resources of one or more of its respective foreign (non-U.S.) affiliates that are not registered under the Investment Advisers Act of 1940, as amended, to provide portfolio management, research, and trading services to the Fund. Under a Participating Affiliate Agreement, and pursuant to applicable guidance from the staff of the SEC, U.S. registered advisors are allowed to use investment advisory and trading resources of such unregistered advisory affiliates subject to the regulatory supervision of the registered advisor. For example, some Principal Fund Complex assets are managed by employees of Principal Global Investors (Europe) Limited pursuant to such an arrangement. Each such affiliate and any of their respective employees who provide services to the Fund are considered under the Participating Affiliate Agreement to be “supervised persons” of the advisor or sub-advisor (as applicable) as that term is defined in the Investment Advisers Act of 1940.

Fees Paid to PGI

The Funds pay PGI a fee for its services, which includes the fee PGI pays to Sub-Advisors, as applicable, and to State Street Bank and Trust for fund administration, fund accounting and other services. Pursuant to the Management Agreement between the Funds and PGI, PGI pays all operating expenses of each Fund, except interest expenses, taxes, brokerage commissions and other expenses connected with executing portfolio transactions, acquired fund fees and expenses, future distribution fees or expenses, and extraordinary expenses.

The fee the Funds paid (as a percentage of the average daily net assets) for the fiscal year ended June 30, 2021 was:


Fund			Fee
Principal Healthcare Innovators ETF			0.42%
Principal Millennials ETF			0.45%
Principal Quality ETF			0.15%
Principal U.S. Mega-Cap ETF			0.15%
Principal U.S. Small-Cap Multi-Factor ETF			0.38%
Principal Value ETF			0.15%

Availability of the discussions regarding the basis for the Board of Trustees approval of the various management and sub-advisory agreements is available for all Funds in the Annual Report to Shareholders for the period ending June 30, 2021 and the Semi Annual Report to Shareholders for the period ending December 31, 2021.

Manager of Managers

Principal Exchange-Traded Funds (the "Trust") operates as a Manager of Managers. Under an order received from the SEC (the "current order"), the Trust and PGI may enter into and materially amend agreements with unaffiliated and wholly-owned affiliated sub-advisors (affiliated sub-advisors which are at least 95% owned, directly or indirectly, by PGI or an affiliated person of PGI) without obtaining shareholder approval, including to:

•hire one or more sub-advisors;

•change sub-advisors; and

•reallocate management fees between PGI and sub-advisors.

Although there is no present intent to do so, the funds may, in the future, rely on current SEC Staff guidance which expands relief under the current order to allow PGI to enter into and materially amend agreements with majority-owned affiliated sub-advisors (affiliated sub-advisors which are at least 50% owned, directly or indirectly, by PGI or an affiliated person of PGI), and, further, to all sub-advisors regardless of the degree of affiliation with PGI.

In order to rely on the varying degrees of relief granted by the order and/or the SEC Staff guidance, a Fund must receive approval from its shareholders (or, in the case of a new Fund, the Fund’s sole initial shareholder before the Fund is available to the other purchasers). The shareholders of each Fund have approved such Fund's reliance on the order, as supplemented by the SEC Staff guidance, with respect to unaffiliated, wholly-owned affiliated, and majority owned affiliated sub-advisors.

PGI has ultimate responsibility for the investment performance of each fund that utilizes a sub-advisor due to its responsibility to oversee sub-advisors and recommend their hiring, termination, and replacement.

In accordance with a separate exemptive order that the Trust and PGI have obtained from the SEC, the Board may approve a new sub-advisory agreement or a material amendment to an existing sub-advisory agreement at a meeting that is not in person, provided that the Board Members are able to participate in the meeting using a means of communication that allows them to hear each other simultaneously during the meeting and the other conditions in the exemptive order are met.

DISTRIBUTOR AND OTHER FUND SERVICE PROVIDERS

ALPS Distributors, Inc. (the "Distributor") serves as the principal underwriter and distributor of Creation Units for the Funds. The Distributor does not maintain a secondary market in Shares.

State Street Bank and Trust Company is the sub-administrator, custodian, transfer agent, and dividend disbursing agent for the Funds.

PRICING OF FUND SHARES

The Funds will directly issue and redeem Shares on a continuous basis, to and from authorized participants ("APs"), at net asset value ("NAV") per Share in aggregations of Shares called “Creation Units.” The value of the Funds' Shares bought and sold in the secondary market (on the exchange identified in each Fund summary) will be determined by market price, as described in the section below.

The Board of Trustees has delegated day-to-day valuation oversight responsibilities to PGI. PGI has established a Valuation Committee to fulfill these oversight responsibilities. The NAV of the Funds is calculated each day the New York Stock Exchange ("NYSE") is open (share prices are not calculated on the days on which the NYSE is closed for trading, generally New Year’s Day, Martin Luther King, Jr. Day, Washington’s Birthday, Presidents’ Day, Good Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, and Christmas). The share price is determined as of the close of business of the NYSE (normally 4:00 p.m. Eastern Time). The Funds will not treat an intraday unscheduled disruption in NYSE trading as a closure of the NYSE and will price its shares as of 4:00 p.m. Eastern Time, if the particular disruption directly affects only the NYSE.

Notes:

• If market quotations are not readily available for a security owned by a Fund, its fair value is determined using a policy adopted by the Trustees. Fair valuation pricing is subjective and creates the possibility that the fair value determined for a security may differ materially from the value that could be realized upon the sale of the security.

• A Fund's securities may be traded on foreign securities markets that generally complete trading at various times during the day before the close of the NYSE. Foreign securities and currencies are converted to U.S. dollars using the exchange rate in effect at the close of the NYSE.

• The trading of foreign securities generally or in a particular country or countries may not take place on all days the NYSE is open, or may trade on days the NYSE is closed. Thus, the value of the foreign securities held by the Fund may change on days when shareholders are unable to purchase or redeem shares.

• Certain securities issued by companies in emerging markets may have more than one quoted valuation at any point in time. These may be referred to as local price and premium price. The premium price is often a negotiated price that may not consistently represent a price at which a specific transaction can be effected. The Fund has a policy to value such securities at a price at which the Advisor expects the securities may be sold.

• With respect to any portion of a Fund’s assets invested in other registered investment companies, that portion of the Fund's NAV is calculated based on the price (NAV or market, as applicable) of such other registered investment companies.

Fund Share Trading Prices and IOPV – Secondary Market

The trading prices of Shares of a Fund on the exchange may differ from the Funds' daily NAV. The price of the Shares will be subject to factors such as supply and demand, as well as the current value of the Fund’s portfolio securities. Secondary market Shares, which are available for purchase or sale on an intraday basis, do not have a fixed relationship to either the previous day’s NAV or to the current day’s NAV. Prices in the secondary market, therefore, may be below, at, or above the most recently calculated NAV per Share.

The approximate value of shares of each Fund, known as the “indicative optimized portfolio value” (“IOPV”) will be disseminated every fifteen seconds throughout the trading day by the national securities exchange on which a Fund is listed or by other information providers or market data vendors. For actively-managed Funds, the IOPV is based on the current market value of holdings contained in the Fund's portfolio at the beginning of the trading day. For passively managed Funds, the IOPV is based on the creation basket constituents, which represents the current market value of the securities and/or cash required to be deposited in exchange for Creation Unit. The IOPV does not necessarily reflect the precise composition of the current portfolio of securities held by the Fund at a particular point in time nor the best possible valuation of the current portfolio. The IOPV should not be viewed as a “real-time” update of the NAV, because the IOPV may not be calculated in the same manner as the NAV, which is computed once a day as discussed below. The IOPV is generally determined by using current market quotations and/or price quotations obtained from broker-dealers that may trade in the portfolio securities held by the Fund. The quotations of certain Fund holdings may not be updated during U.S. trading hours if such holdings do not trade in the U.S. The Funds and

the Advisor are not involved in, or responsible for, the calculation or dissemination of the IOPV and make no warranty as to its accuracy. A Fund may choose to discontinue the dissemination of the IOPV so long as such dissemination is not required by applicable Exchange rules.

Shares of each Fund may trade in the secondary market on days when the Fund does not accept orders to purchase or redeem shares. On such days, shares may trade in the secondary market with more significant premiums or discounts than might otherwise be experienced on days when the Fund accepts purchase and redemption orders.

Information regarding how often the Shares of each Fund traded on the exchange at a price above (at a premium) or below (at a discount) the NAV per Share of the Fund during the past four calendar quarters (if available) can be found at www.principaletfs.com. Data presented represents past performance and cannot be used to predict future results.

PURCHASE AND SALE OF FUND SHARES

Generally

The Funds will directly issue shares to authorized participants ("APs") on a continuous basis at net asset value ("NAV") per Share in aggregations of Shares called “Creation Units,” in exchange for portfolio securities, in the amounts listed below.


Fund			Number of Shares in a Creation Unit*
All Funds			50,000

*Number of Shares in a Creation Unit is subject to change.

To be an AP, you must be a member or participant ("Participating Party") in the Continuous Net Settlement System of the National Securities Clearing Corporation (“NSCC”) or a participant in the DTC with access to the DTC system (“DTC Participant”), and you must execute an agreement ("Participant Agreement") with the Distributor, which must be accepted by the Transfer Agent, that governs transactions in the Fund's Creation Units.

APs may acquire Shares directly from the Funds, and APs may tender their Shares for redemption directly to the Funds, at NAV per Share only in Creation Units or Creation Unit Aggregations, and in accordance with the procedures described in the SAI. Shares are not individually redeemable, but are redeemable only in Creation Unit aggregations, and in exchange for portfolio securities and/or cash.

All orders to purchase or redeem Creation Units must be placed through an AP that has entered into a Participant Agreement with the Distributor and accepted by the Transfer Agent with respect to the creation and redemption of Creation Units. An investor purchasing or redeeming a Creation Unit from the Funds may be charged a fee (“Transaction Fee”) to protect existing shareholders of the Funds from the dilutive costs associated with the purchase and redemption of Creation Units.

Shareholders who are not APs will not be able to purchase or redeem Shares directly with or from the Funds. As a result, most investors will buy and sell Shares of the Funds in secondary market transactions through brokers. Shares of the Funds are expected to be listed for trading on the secondary market on the exchange identified in the Fund Summary for each Fund. Shares can be bought and sold throughout the trading day like other publicly traded shares. There is no minimum investment. When buying or selling Shares through a broker, you will incur customary brokerage commissions and charges, and you may pay some or all of the spread between the bid and the offered price in the secondary market on each leg of a round trip (purchase and sale) transaction. Due to the costs of buying or selling shares, including bid/ask spreads, frequent trading of shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. Shares of the Funds trade under the symbols set forth on the cover of this prospectus. Contact your broker for additional information on how to buy and sell Shares.

PGI may recommend to the Board, and the Board may elect, to liquidate and terminate a Fund at any time without shareholder approval.

Note: No salesperson, broker-dealer, or other person is authorized to give information or make representations about the Fund other than those contained in this Prospectus. Information or representations not contained in this prospectus may not be relied upon as having been provided or made by the Trust, the Funds, PGI, any Sub-Advisor, or the Distributor.

Book Entry

Shares are held in book-entry form, which means that no stock certificates are issued. The Depository Trust Company ("DTC") or its nominee is the record owner of all outstanding Shares of the Funds and is recognized as the owner of all Shares for all purposes.

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

DIVIDENDS AND DISTRIBUTIONS

The Funds intend to generally make distributions of net income as follows:


Fund			Quarterly
Principal Healthcare Innovators ETF			X
Principal Millennials ETF			X
Principal Quality ETF			X
Principal U.S. Mega-Cap ETF			X
Principal U.S. Small-Cap Multi-Factor ETF			X
Principal Value ETF			X

The Funds do not guarantee they will make any payments to shareholders on the frequency set forth above, or at all. Factors that could affect a Fund’s ability to make distributions include, without limitation, changes in interest rates, the performance of the financial markets in which the Fund invests, the allocation of Fund assets across different asset classes and investments, the performance of the Fund’s investment strategies, and the amount and timing of the Fund’s prior distributions.

With respect to Funds that intend to make monthly distributions, each Fund seeks to tailor the amount of its monthly income payments to moderate fluctuations in the amounts it distributes to shareholders over the course of the year. Although each Fund attempts to moderate fluctuations, the amounts it distributes to shareholders are not fixed and may not be the same each month.

The Funds do not expect to make distributions that will be treated as return of capital, although no Fund can guarantee that it will not do so. Return of capital represents the return of a shareholder’s original investment in Fund shares, not a dividend from the Fund’s profits and earnings. If a Fund’s distributions are treated as a return of capital, the distributions themselves may not be taxable, but they will lower a shareholder's basis in the Fund shares so that when such shares are sold (even if they are sold at a loss on the original investment), the shareholder may be obligated to pay taxes on the capital gains. At the end of the year, the Funds may be required under applicable law to re-characterize distributions for the year among ordinary income, capital gains, and return of capital (if any) for purposes of tax reporting to shareholders.

To the extent that distributions a Fund pays are derived from a source other than net income (such as a return of capital), you will receive a notice disclosing the source of such distributions. Furthermore, such notice will be posted monthly on our website at www.principalfunds.com/sources-of-distribution. You may request a copy of all such notices, free of charge, by telephoning 1-800-222-5852. The amounts and sources of distributions included in such notices are estimates only and you should not rely upon them for purposes of reporting income taxes. Each Fund will send shareholders a Form 1099-DIV for the calendar year that will tell shareholders how to report these distributions for federal income tax purposes.

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

FREQUENT PURCHASES AND REDEMPTIONS

Particularly where creation and redemption baskets include a cash component, frequent purchases and redemptions pose a risk to the Funds because they may disrupt the management of the Funds by forcing the Funds to hold short-term (liquid) assets rather than investing for long-term growth, which results in lost investment opportunities for the Funds. Such transactions may also cause unplanned portfolio turnover, hurt the portfolio performance of the Funds, and increase expenses of the Funds due to increased broker-dealer commissions and recordkeeping and related costs.

Shares of the Funds are listed and traded on national securities exchanges. Therefore, it is unlikely that a shareholder could take advantage of a potential arbitrage opportunity presented by a lag between a change in the value of the Fund’s portfolio securities after the close of the primary markets for the Fund’s portfolio securities and the reflection of that change in a Fund’s NAV (“market timing”), because each Fund sells and redeems its shares directly through transactions that are in-kind and/or for cash. Further, each Fund may impose transaction fees on purchases and redemptions of Creation Units to cover the custodial and other costs each Fund incurs in effecting trades which may help minimize the potential consequences of frequent purchases and redemptions of shares. For these reasons, the Board of Trustees believes that a frequent trading monitoring policy is unnecessary for the Funds. Each Fund reserves the right, without prior written notice, to reject orders from APs that the Fund determines to be disruptive to the management of the Fund or otherwise not in the best interests of the Fund.

TAX CONSIDERATIONS

The following discussion summarizes some of the possible consequences under current federal tax law of an investment in a Fund. It is not a substitute for personal tax advice. You also may be subject to state, local, and/or foreign tax on Fund distributions and sales of Shares. Consult your personal tax advisor about the potential tax consequences of an investment in Shares under all applicable tax laws. For more information, please see the section entitled "Taxes" in the SAI.

Taxes

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

Unless your investment in Shares is made through a tax-exempt entity or tax-deferred retirement account, such as an IRA plan, you need to be aware of the possible tax consequences when:

•a Fund makes distributions,

•you sell your Shares listed on the exchange, and

•you purchase or redeem Creation Units.

Taxes on Distributions

As stated above, dividends from net investment income and net capital gains, ordinarily, are declared and paid monthly or quarterly. A Fund also may pay a special distribution at the end of the calendar year to comply with federal tax requirements. In general, your distributions are subject to federal income tax when they are paid, whether you take them in cash or reinvest them in the Fund.

Dividends paid out of a Fund's income and net realized short-term capital gains, if any, are generally taxable as ordinary income, except that the Fund’s dividends attributable to its “qualified dividend income” (i.e., dividends received on stock of most domestic and foreign corporations, including Chinese corporations, with respect to which the Fund satisfies certain holding period and other restrictions) generally will be subject to federal income tax for individual and certain other non-corporate shareholders (each, an “individual shareholder”) who satisfy those restrictions with respect to their Fund shares at the lower rates for long-term capital gains—a maximum of 15% (or 20% for individual shareholders with taxable income exceeding certain thresholds, which will be adjusted annually for inflation). Distributions of net long-term capital gains, if any, in excess of net short-term capital losses are taxable as long-term capital gains, regardless of how long you have held the Shares.

Distributions in excess of a Fund's current and accumulated earnings and profits, if any, are treated as a tax-free return of capital to the extent of your basis in the Shares, and as capital gain thereafter. A distribution will reduce the Fund's NAV per Share and may be taxable to you as ordinary income or long-term capital gains even though, from an investment standpoint, the distribution may constitute a return of capital.

By law, a Fund may be required to withhold a percentage of your distributions and proceeds if you have not provided your taxpayer identification number or social security number.

Taxes on Share Sales

Any capital gain or loss you realize upon a sale of Shares generally is treated as long-term capital gain, taxable at the rates mentioned above for individual shareholders, or loss if you held the Shares for more than one year and as short-term capital gain or loss if you held the Shares for one year or less. The ability to deduct capital losses may be limited.

Taxes on Purchase and Redemption of Creation Units

An AP who exchanges securities for Creation Units generally will recognize a gain or a loss. The gain or loss will be equal to the difference between the market value of the Creation Units at the time and the exchanger's aggregate basis in the securities surrendered and the cash component paid. A person who exchanges Creation Units for securities generally will recognize a gain or loss equal to the difference between the exchanger's basis in the Creation Units and the aggregate market value of the securities received and the cash redemption amount. The Internal Revenue Service, however, may assert that a loss realized upon an exchange of securities for Creation Units cannot be deducted currently under the rules governing "wash sales," or on the basis that there has been no significant change in economic position. Persons exchanging securities should consult their own tax advisors with respect to whether wash sale rules apply and when a loss might be deductible.

Any capital gain or loss realized upon redemption of Creation Units generally is treated as long-term capital gain or loss if the Shares have been held for more than one year and as a short-term capital gain or loss if the Shares have been held for one year or less.

DISTRIBUTION PLANS AND INTERMEDIARY COMPENSATION

Distribution and/or Service (12b-1) Fees

The Trust has adopted a distribution plan for the Fund pursuant to Rule 12b-1 under the Investment Company Act. Under the 12b-1 Plan, each Fund is authorized to pay fees for distribution related expenses and/or for providing services to shareholders of up to 0.25% of the Fund’s average daily net assets each year.

No 12b-1 fees are currently paid by the Funds, and there are no current plans to impose these fees.

However, in the event the Board of Trustees approves charging 12b-1 fees in the future, because Rule 12b-1 fees are paid out of Fund assets and are ongoing fees, over time they will increase the cost of your investment in the Funds and may cost you more than other types of sales charges.

Additional Payments to Intermediaries

Shares of the Funds are sold primarily through intermediaries, such as brokers, dealers, investment advisors, banks, trust companies, pension plan consultants, retirement plan administrators and insurance companies.

PGI and its affiliates may, out of their own resources, pay amounts to intermediaries that support the distribution or marketing of shares of the Funds or provide services to Fund shareholders.

In some cases, PGI or their respective affiliates will provide payments or reimbursements in connection with the costs of conferences and seminars, and educational, training and marketing efforts related to the Fund. Such activities may be sponsored by intermediaries, PGI or their respective affiliates. Additional costs paid or reimbursed may include travel, lodging, entertainment, meals and small gifts. In some cases, PGI or their respective affiliates will also provide payment or reimbursement for expenses associated with transactions ("ticket") charges and general marketing expenses. For more information, see the SAI.

The payments described in this prospectus may create a conflict of interest by influencing your Financial Professional or your intermediary to recommend a Fund over another investment. Ask your Financial Professional or visit your intermediary's website for more information about the total amounts paid to them by PGI and its affiliates, and by sponsors of other investment companies your Financial Professional may recommend to you.

Your intermediary may charge you additional fees other than those disclosed in this prospectus. Ask your Financial Professional about any fees and commissions they charge.

FUND ACCOUNT INFORMATION

Continuous Offering

The method by which Creation Unit Aggregations are created and traded may raise certain issues under applicable securities laws. Because new Creation Unit Aggregations of Shares are issued and sold by the Fund on an ongoing basis, a "distribution," as such term is used in the Securities Act of 1933, as amended (the "Securities Act"), may occur at any point. Broker-dealers and other persons are cautioned that some activities on their part may, depending on the circumstances, result in their being deemed participants in a distribution in a manner which could render them statutory underwriters and subject them to the prospectus delivery requirement and liability provisions of the Securities Act.

For example, a broker-dealer firm or its client may be deemed a statutory underwriter if it takes Creation Unit Aggregations after placing an order with the Distributor, breaks them down into constituent Shares and sells such Shares directly to customers, or if it chooses to couple the creation of a supply of new Shares with an active selling effort involving solicitation of secondary market demand for Shares. A determination of whether one is an underwriter for purposes of the Securities Act must take into account all the facts and circumstances pertaining to the activities of the broker-dealer or its client in the particular case, and the examples mentioned above should not be considered a complete description of all the activities that could lead to a characterization as an underwriter.

Broker-dealer firms also should note that dealers who are not "underwriters" but are effecting transactions in Shares, whether or not participating in the distribution of Shares, generally are required to deliver a prospectus. This is because the prospectus delivery exemption in Section 4(a)(3)(C) of the Securities Act is not available in respect of such transactions as a result of Section 24(d) of the 1940 Act. As a result, broker-dealer firms should note that dealers who are not "underwriters" but are participating in a distribution (as contrasted with engaging in ordinary secondary market transactions), and thus dealing with the Shares that are part of an overallotment within the meaning of Section 4(a)(3)(C) of the Securities Act, will be unable to take advantage of the prospectus delivery exemption provided by Section 4(a)(3) of the Securities Act. For delivery of prospectuses to exchange members, the prospectus delivery mechanism of Rule 153 under the Securities Act only is available with respect to transactions on a national exchange.

Reservation of Rights

The Trust reserves the right to amend or terminate a Fund, as well as certain terms related to a Fund, described in this prospectus. Shareholders will be notified of any such action to the extent required by law.

Multiple Translations

This prospectus may be translated into other languages. In the event of any inconsistencies or ambiguity as to the meaning of any word or phrase in a translation, the English text will prevail.

Financial Statements

Shareholders will receive annual financial statements for the Funds, audited by the Funds’ independent registered public accounting firm. Shareholders will also receive semiannual financial statements that are unaudited.

Section 12(d)(1)

Section 12(d)(1) of the 1940 Act restricts investments by investment companies in the securities of other investment companies. However, registered investment companies are permitted to invest in a Fund beyond the limits set forth in Section 12(d)(1) subject to certain terms and conditions set forth in an SEC exemptive order issued to the Trust, including that such investment companies enter into an agreement with the Trust on behalf of a Fund prior to exceeding the limits imposed by Section 12(d)(1).

UNDERLYING INDICES

Nasdaq (the “Index Provider”) developed the methodology for each underlying index listed below with input from the Fund's advisor. The Index Provider sponsors and owns each index, determines the composition and relative weightings of the securities in the index, and publishes information regarding the market value of the index. The Index Provider is not affiliated with the Fund or the advisor.

Nasdaq Global Millennial Opportunity Index (NQGMOI)

Delete this section on or about July 15, 2022.

The Nasdaq Global Millennial Opportunity Index is designed to provide exposure to companies within the Nasdaq Global Index that are impacted by the spending and lifestyle activities of the Millennial generation, which refers to people born from 1980 to the mid-2000s. Index eligibility is limited to specific security types. To be eligible for inclusion in the Index, a security must be a component of the Nasdaq Global Index. However, an exchange-listed security that is not a component of the Nasdaq Global Index may be eligible if it otherwise meets all of the eligibility criteria.

Each security's exposure to Millennials is determined using a proprietary, multi-step research process. First, fundamental research is conducted on trends related to the millennial generation, including but not limited to: consumer spending data, consumer behavior, technology and demographics. Based on this analysis, key categories are identified that appear to be most reflective of how the millennial generation spends time and money. As of May 22, 2016, eight key themes related to Millennials have been identified: technology (such as devices, eCommerce, apps, and games); consumer goods (such as clothing and travel); drinking, dining, and health/wellness; households; financials (such as FinTech and wealth management); education; women as consumers (including child care, clothing, beauty and cosmetics); and sharing economy (such as car rental, lending services, and self-storage). These themes may change over time.

Using a variety of sources (including, but not limited to: industry reports, investment research and financial statements published by companies), companies with significant exposures to these themes are identified. Companies identified at this stage are then considered for further analysis, which ultimately determines their eligibility for inclusion in the Index.

In the final step of the research process, companies are evaluated based on quantitative and qualitative factors using the fundamental research conducted on trends related to the millennial generation. A composite analysis scores these companies to determine the companies that are most reflective of Millennial companies. Each is identified as having low, medium, or high exposure to Millennials based on the materiality of the company's exposure to Millennial-related themes and the potential role of Millennials in driving long-term growth.

To be eligible for the Index, a security must have high or medium exposure to Millennials. "Medium exposure" means that Millennials-related products, technologies, services and solutions are an important factor of the company's business model, strategy and research and development, and are material to sales and/or growth. "High exposure" means that Millennials-related products, technologies, services and solutions are core to the company's business model, strategy and research and development, and are material to sales and/or growth.

Securities with a market capitalization of less than $200M are excluded from being eligible for the Index, as are duplicative securities (where companies are listed more than once). Certain other securities may be excluded from the Index due to operational concerns, for example, where it is difficult to gain access to the market for the securities. Securities are also excluded if certain extraordinary events have recently occurred, such as large-scale investigations or charges against key executives.

The remaining securities are then ranked based upon the following two factors: quality growth and value. Every security receives a rank based upon the scores for these two factors. Each of these two factors are then combined and equally weighted.

Securities of companies having high exposure to Millennials receive 70% of the weight of the index. High exposure securities are broken down into two groups: large cap (40% index weight) and small-mid-cap (30% index weight) and weighted as follows:

•High exposure, large cap securities in the top 50% of the two factor ranking receive 24% index weight;

•High exposure, large cap securities in the bottom 50% of the two factor ranking receive 16% index weight;

•High exposure, small-mid cap securities in the top 50% of the two factor ranking receive 18% index weight; and

•High exposure, small-mid cap securities in the bottom 50% of the two factor ranking receive 12% index weight.

Securities of companies having medium exposure to Millennials receive 30% of the weight of the index. In order to receive a weight in the index, medium exposure securities must be ranked in the top 50% of the two factor ranking with respect to their large or small-mid-cap counterparts.

•Medium exposure, large cap securities in the top 50% of the two factor ranking receive 20% index weight;

•Medium exposure, small-mid cap securities in the top 50% of the two factor ranking receive 10% index weight.

As described above, there are six eligible buckets of securities. Securities within each of the six assigned buckets are equally weighted.

1.Large cap, high exposure to Millennials, top 50% of the two factor ranking system (24% index weight)

2.Large cap, high exposure to Millennials, bottom 50% of the two factor ranking system (16% index weight)

3.Small-mid-cap, high exposure to Millennials, top 50% of the two factor ranking system (18% index weight)

4.Small-mid-cap, high exposure to Millennials, bottom 50% of the two factor ranking system (12% index weight)

5.Large cap, medium exposure to Millennials, top 50% of the two factor ranking system (20% index weight)

6.Small-mid-cap, medium exposure to Millennials, top 50% of the two factor ranking system (10% index weight)

The Index is rebalanced annually.

Nasdaq US Health Care Innovators Index (NQHCIN)

Delete this section on or about July 15, 2022.

The Nasdaq US Health Care Innovators Index is designed to provide exposure to non-mega cap US Health Care companies within the Nasdaq US Benchmark Index that are "non-earners," which refers to early-stage companies that are not yet consistently profitable. Index eligibility is limited to specific security types only. To be eligible for inclusion in the Index, a security must be a component of the Nasdaq US Benchmark Index and each security must be classified as Health Care according to the Industry Classification Benchmark (ICB).

Securities are ranked based upon their market cap, and the least liquid securities are excluded. Those securities not ranked in the top 150 securities of the Nasdaq US Benchmark Index by market cap are deemed eligible. If in the index in the prior period, those securities with a rank in the top 80% by average daily dollar trading volume (ADDTV) of the Nasdaq US Benchmark Index are deemed eligible. For new securities to be eligible they must satisfy a liquidity threshold, using a 3-month ADDTV, of being in the Top 70% most liquid names with Nasdaq US Benchmark Index. Lastly, securities considered to be non-earners by means of having negative earnings over the prior 4, prior 8 or future 4 quarters at least half of the time are deemed eligible. The index is rebalanced semi-annually in April and October and employs a modified market cap weighting methodology. Final eligible securities receive a maximum weight of 3% and all excess weight is distributed proportionally across the remaining index securities.

Nasdaq US Mega Cap Select Leaders Index (NQMCUSLT)

Delete this section on or about June 10, 2022.

The Nasdaq US Mega Cap Select Leaders Index uses a quantitative model designed to provide exposure to equity securities of companies with the largest market capitalizations in the Nasdaq US 500 Large Cap Index (the "Parent Index"), with higher weights given to securities that are less volatile.

To be eligible for the Index, a security must be in the top 50th percentile of the Parent Index by aggregate company market capitalization. One security per company is permitted.

The Index employs a modified equal-dollar weighting methodology. Securities of companies in the top 10% of aggregate market cap maintain company market cap weight. Securities of companies that are not in the top 10% of aggregate market cap are initially equal weighted and then volatility adjusted such that those in the groups with lower volatility receive 1% higher weight than the initial equal weighting, the middle groups maintain the equal weighting, and those with higher volatility receive 1% lower weight than the initial equal weighting. This process is employed so that the least volatile securities have the highest weight and the most volatile securities have the lowest weight.

The Index is evaluated semi-annually in April and October. Security additions and deletions are made effective after the close of trading on the last trading day in April and October. Additionally, if at any time during the year other than the evaluation, an Index Security no longer meets the eligibility criteria, or is otherwise determined to have become ineligible for inclusion in the Index, the security is removed from the Index and is not replaced.

The Nasdaq US Price Setters Index (NQPRCE)

Delete this section on or about June 17, 2022.

The Nasdaq US Price Setters Index (NQPRCE) is designed to provide exposure to US companies within the Nasdaq US Large Mid Cap Index which exhibit high degrees of pricing power. The universe of securities is screened by a series of quantitative and qualitative factors. The top-ranked securities are then selected, and a proprietary weighting methodology is applied. Index eligibility is limited to specific security types only. To be eligible for inclusion in the Index, a security must be a component of the Nasdaq US Large Mid Cap Index (NQUSBLM) and must be a top 550 name by market capitalization.

Securities are ranked based upon the following eleven factors: Earnings per share ("EPS") Growth (1 year), EPS Growth (3 year), operating margin, operating margin growth (1 year), 12 months return volatility, sales growth (3 year), return on equity, the coefficient of variation of 7 year EPS, earning quality, the standard deviation of 7 year operating margin, and the coefficient of variation of second fiscal year EPS estimate. The average of the 11 factor scores is taken to create one score in a scale of 1 to 10 (1 = best). Then, a final rank is created based upon the average score of each security, with full market cap determining the outcome if there is a tie. Lastly, the top 150 securities by final rank are selected. The Index employs a modified equal dollar weighting methodology such that securities in the top 50 by rank receive 50% of the index weight, the top 51-100 receive 35% of the index weight, and the top 101-150 receive 15% of the index weight. Each security’s Index market value is rebalanced annually in March to an equal dollar value corresponding to an equal percent weight within each bucket of 50 securities, with the aggregate market value of the Index totaling the unadjusted market value of the eligible securities. In short, the top 50 names receive a weight of 1.0% each, the following 51-100 securities receive a weight of 0.7% each and the following 101-150 securities receive a weight of 0.3% each.

Nasdaq US Shareholder Yield Index (NQSHYL)

Delete this section on or about June 17, 2022.

The Nasdaq US Shareholder Yield Index (NQSHYL) is designed to provide exposure to US companies within the Nasdaq US Large MidCap Index (NQUSBLM) which exhibit high degrees of sustainable shareholder yield. The universe of securities is screened by a series of quantitative and qualitative factors. The top-ranked securities are then selected, and a proprietary weighting methodology is applied. Index eligibility is limited to specific security types only. To be eligible for inclusion in the Index, a security must be a component of the Nasdaq US Large MidCap Index and the security must have paid a regular dividend in the prior year.

Securities are ranked based upon the following nine factors: dividend yield, buyback yield, dividend payout per share, free cash flow to price, free cash flow growth 3-year Sharpe ratio, EBITDA to debt, dividend yield historical valuation (3-year and 5-year), dividend growth (1-year, 3-year and 5-year), and free cash flow (1-year, 3-year and 5-year). The average of the nine factor scores is taken to create one score in a scale of 1 to 10 (1 = best). Then, a final rank is created based upon the average score of each security with total shareholder yield (dividend yield + buyback yield) determining the outcome if there is a tie. Lastly, the final decile score (scale of 1 to 10; 1=best) is created by utilizing the final rank. Securities in the top two deciles are then selected. The Index employs a modified yield weighting methodology such that securities in the top two deciles are weighted according to their dividend yields. Each security’s Index market value is rebalanced annually in March to a value corresponding to the modified yield weight. Final eligible securities receive a maximum weight of 3% and all excess weight is distributed proportionally across the remaining index securities.

Nasdaq US Small Cap Select Leaders Index (NQUSSLT)

Delete this section on or about July 8, 2022.

The Nasdaq US Small Cap Select Leaders Index (NQUSSLT) is designed to provide exposure to equity securities of U.S. small capitalization companies within the Nasdaq US Small Cap Index (NQUSS) that exhibit the potential for high degrees of sustainable shareholder yield, pricing power, and strong momentum, while adjusting for liquidity and quality as determined by a quantitative model. Index eligibility is limited to specific security types only. The security types eligible for the index include common stocks, ordinary shares, depositary receipts, shares of beneficial interest and REITs.

To be eligible for inclusion in the Index, a security must:

•be a component of the Nasdaq US Small Cap Index (NQUSS);

•be in the top 90th percentile of the Nasdaq US Benchmark Index (NQUSB) in terms of 3-month Average Daily Dollar Volume;

•be in the top 20th percentile of the Final Rank (process described below) in the current period, or, be in the top 50th percentile of the Final Rank, if the security was in the index in the prior period;

•have a minimum 3-month trading history;

•may not be issued by an issuer that has entered into a definitive agreement or other arrangement which would likely result in the security no longer being Index eligible; and

•may not be issued by an issuer currently in bankruptcy proceedings.

One security per issuer is permitted. If an issuer has multiple securities, the security with the highest dollar trading volume will be selected for possible inclusion into the Index. Additional proprietary eligibility criteria may be applied.

Securities in the Nasdaq US Small Cap Index (NQUSS) are ranked according to their individual Shareholder Yield, Price Setters, and Momentum ranks. These three individual ranks determine the degree in which a security in the Nasdaq US Small Cap Index (NQUSS) exhibits high degrees of sustainable shareholder yield (value factor), pricing power (quality growth factor), and momentum, respectively. These three individual ranks are then normalized by industry so that each security has a Shareholder Yield, Price Setters, and Momentum rank that is based on that security’s ICB Industry Classification. This allows for the three individual ranks to be sector-neutral.

The three individual normalized ranks are averaged to determine a preliminary Score for each security. If the security was not in the Shareholder Yield Index (i.e. it did not pay a dividend), then the Price Setters and Momentum ranks are averaged to determine the preliminary Score for each security.

A Final Rank is calculated by ranking the preliminary Score for each security within each industry, where the higher Average Daily Dollar Volume breaks any ties in the preliminary Score. This Final Rank is used in the Eligibility screen, as described above, to determine the final basket of securities in the Index.

The Index is rebalanced semi-annually in April and October and employs a modified market cap weighting methodology. The modified liquidity weighting is derived by first calculating a liquidity score adjusted for volatility (“liquidity-volatility score”). This process is done multiplying the 3-month average daily dollar volume of an Index security by the average 3-month volatility of the Nasdaq US Small Cap (NQUSS) universe and dividing that by the 3-month Volatility of the corresponding Index Security. Next, the liquidity-volatility score is then used to determine the preliminary weight of each security. The preliminary weight is derived by dividing the liquidity-volatility score for each security by the sum of the liquidity-volatility scores for all securities within each industry and multiplying that by the NQUSS Benchmark Industry Weight for that security. The final weight modifies the preliminary weight by capping each security weight at 0.7% and redistributing the excess weight evenly across all securities within the same industry. Index Shares are then calculated multiplying the final weight of each security derived above by the new market value of the Index and dividing that by its corresponding Last Sale Price. The changes are effective after the close of trading on the last trading day in April and October.

Index Rebalance Dates

During extraordinary market conditions, the index provider may delay the scheduled rebalancing of an index until a future date when conditions have changed.

Other Information

Nasdaq® and the above-listed indexes (the "Nasdaq Indexes"), are registered trademarks of Nasdaq, Inc. (which with its affiliates is referred to as the “Corporations”) and are licensed for use by PGI. The above-named Funds are not sponsored, endorsed, sold or promoted by the Corporations. The Corporations have not passed on the legality or suitability of, or the accuracy or adequacy of descriptions and disclosures relating to, the Funds. The Corporations make no representation or warranty, express or implied to the owners of the Funds or any member of the public regarding the advisability of investing in securities generally or in the Funds particularly, or the ability of the Indexes to track general stock market performance. Except where Nasdaq serves as a fund's listing agent, the Corporations' only relationship to PGI (“Licensee”) is in the licensing of the Nasdaq®, and certain trade names of the Corporations and the use of the Indexes which are determined, composed and calculated by Nasdaq without regard to Licensee or the Funds. Nasdaq has no obligation to take the needs of the Licensee or the owners of the Funds into consideration in determining, composing or calculating the Indexes. The Corporations are not responsible for and have not participated in the determination of the timing of, prices at, or quantities of the Funds to be issued or in the determination or calculation of the equation by which the Funds is to be converted into cash. The Corporations have no liability in connection with the administration, marketing or trading of the Funds.

The Corporations do not guarantee the accuracy and/or uninterrupted calculation of the Indexes or any data included therein. The Corporations make no warranty, express or implied, as to results to be obtained by Licensee, owners of the product(s), or any other person or entity from the use of the Indexes or any data included therein. The Corporations make no express or implied warranties, and expressly disclaim all warranties of merchantability or fitness for a particular purpose or use with respect to the Indexes or any data included therein. Without limiting any of the foregoing, in no event shall the Corporations have any liability for any lost profits or special, incidental, punitive, indirect, or consequential damages, even if notified of the possibility of such damages.

No party (including the Corporations) guarantees the accuracy or completeness of the data on which the Indicative Optimized Portfolio Value (IOPV) calculations are based or the actual computation of the value of the IOPV, nor shall any such party be responsible for any delays in the computation or dissemination of the IOPV values. No party (including the Corporations) makes any warranty, express or implied, as to results to be obtained by the Funds, owners of the Funds, or any other person or entity from the use of the IOPV(s) or any data included therein. No party (including the Corporations) makes any express or implied warranties, and each such party expressly disclaims all warranties of merchantability or fitness for a particular purpose or use with respect to the IOPV(s) or any data included therein. Without limiting any of the foregoing, in no event shall any party (including the Corporations) have any liability for any lost profits or special, incidental, punitive, indirect, or consequential damages, even if notified of the possibility of such damages.

APPENDIX A – DESCRIPTION OF BOND RATINGS

Moody's Investors Service, Inc. Rating Definitions:

Long-Term Obligation Ratings

Ratings assigned on Moody's global long-term obligation rating scales are forward-looking opinions of the relative credit risk of financial obligations issued by non-financial corporates, financial institutions, structured finance vehicles, project finance vehicles, and public sector entities. Long-term ratings are assigned to issuers or obligations with an original maturity of one year or more and reflect both on the likelihood of a default or impairment on contractual financial obligations and the expected financial loss suffered in the event of default or impairment.1

1 For certain structured finance, preferred stock and hybrid securities in which payment default events are either not defined or do not match investor’s expectations for timely payment, the ratings reflect the likelihood of impairment and the expected financial loss in the event of impairment.

Aaa: Obligations rated Aaa are judged to be of the highest quality, subject to the lowest level of credit risk.

Aa: Obligations rated Aa are judged to be of high quality and are subject to very low credit risk.

A: Obligations rated A are considered upper-medium grade and are subject to low credit risk.

Baa: Obligations rated Baa are subject to moderate credit risk. They are considered medium-grade and as such may possess certain speculative characteristics.

Ba: Obligations rated Ba are judged to be speculative and are subject to substantial credit risk.

B: Obligations rated B are considered speculative and are subject to high credit risk.

Caa: Obligations rated Caa are judged to be speculative of poor standing and are subject to very high credit risk.

Ca: Obligations rated Ca are highly speculative and are likely in, or very near, default, with some prospect of recovery of principal and interest.

C: Obligations rated C are the lowest rated class of bonds and are typically in default, with little prospect for recovery of principal or interest.

NOTE: Moody's appends numerical modifiers, 1, 2, and 3 to each generic rating classification from Aa through Caa. The modifier 1 indicates that the obligation ranks in the higher end of its generic rating category, the modifier 2 indicates a mid-range ranking, and the modifier 3 indicates a ranking in the lower end of that generic rating category. Additionally, a “(hyb)” indicator is appended to all ratings of hybrid securities issued by banks, issuers, financial companies, and securities firms.*

* By their terms, hybrid securities allow for the omission of scheduled dividends, interest, or principal payments, which can potentially result in impairment if such an omission occurs. Hybrid securities may also be subject to contractually allowable write-downs of principal that could result in impairment. Together the hybrid indicator, the long-term obligation rating assigned to a hybrid security is an expression of the relative credit risk associated with that security.

SHORT-TERM NOTES: Short-term ratings are assigned to obligations with an original maturity of thirteen months or less and reflect both on the likelihood of default or impairment on contractual financial obligations and the expected financial loss suffered in the event of default. Moody's employs the following three designations, all judged to be investment grade, to indicate the relative repayment ability of rated issuers:

Issuers rated Prime-1 (or related supporting institutions) have a superior ability to repay short-term debt obligations.

Issuers rated Prime-2 (or related supporting institutions) have a strong ability to repay short-term debt obligations.

Issuers rated Prime-3 (or related supporting institutions) have an acceptable ability to repay short-term obligations.

Issuers rated Not Prime do not fall within any of the Prime rating categories.

US MUNICIPAL SHORT-TERM DEBT: The Municipal Investment Grade (MIG) scale is used to rate US municipal bonds of up to five years maturity. MIG ratings are divided into three levels - MIG 1 through MIG 3 - while speculative grade short-term obligations are designated SG.

MIG 1 denotes superior credit quality, afforded excellent protection from highly reliable liquidity support, or demonstrated broad-based access to the market for refinancing.

MIG 2 denotes strong credit quality with ample margins of protection, although not as large as in the preceding group.

MIG 3 notes are of acceptable credit quality. Liquidity and cash-flow protection may be narrow and market access for refinancing is likely to be less well-established.

SG denotes speculative-grade credit quality and may lack sufficient margins of protection.

Description of S&P Global Ratings' Credit Rating Definitions:

S&P Global's credit rating, both long-term and short-term, is a forward-looking opinion of the creditworthiness of an obligor with respect to a specific obligation. This assessment takes into consideration the creditworthiness of guarantors, insurers, or other forms of credit enhancement on the obligation.

The credit rating is not a recommendation to purchase, sell or hold a security, inasmuch as it does not comment as to market price or suitability for a particular investor.

The ratings are statements of opinion as of the date they are expressed furnished by the issuer or obtained by S&P Global Ratings from other sources S&P Global Ratings considers reliable. S&P Global Ratings does not perform an audit in connection with any rating and may, on occasion, rely on unaudited financial information. The ratings may be changed, suspended, or withdrawn as a result of changes in, or unavailability of, such information, or for other circumstances.

The ratings are based, in varying degrees, on the following considerations:

•Likelihood of payment - capacity and willingness of the obligor to meet its financial commitment on an obligation in accordance with the terms of the obligation;

•Nature of and provisions of the financial obligation;

•Protection afforded by, and relative position of, the financial obligation in the event of bankruptcy, reorganization, or other arrangement under the laws of bankruptcy and other laws affecting creditor's rights.

LONG-TERM CREDIT RATINGS:

AAA: Obligations rated ‘AAA’ have the highest rating assigned by S&P Global Ratings. The obligor’s capacity to meet its financial commitment on the obligation is extremely strong.

AA: Obligations rated ‘AA’ differ from the highest-rated issues only in small degree. The obligor’s capacity to meet its financial commitment on the obligation is very strong.

A: Obligations rated ‘A’ have a strong capacity to meet financial commitment on the obligation although they are somewhat more susceptible to the adverse effects of changes in circumstances and economic conditions than obligations in higher-rated categories.

BBB: Obligations rated ‘BBB’ exhibit adequate protection parameters; however, adverse economic conditions or changing circumstances are more likely to lead to a weakened capacity to meet financial commitment on the obligation.

BB, B, CCC, Obligations rated ‘BB’, ‘B’, ‘CCC’, ‘CC’, and ‘C’ are regarded, on balance, as having significant

CC, and C: speculative characteristics. ‘BB’ indicates the lowest degree of speculation and ‘C’ the highest degree of speculation. While such obligations will likely have some quality and protective characteristics, these may be outweighed by large uncertainties or major risk exposures to adverse conditions.

BB: Obligations rated ‘BB’ are less vulnerable to nonpayment than other speculative issues. However it faces major ongoing uncertainties or exposure to adverse business, financial, or economic conditions which could lead to the obligor’s inadequate capacity to meet its financial commitment on the obligation.

B: Obligations rated ‘B’ are more vulnerable to nonpayment than ‘BB’ but the obligor currently has the capacity to meet its financial commitment on the obligation. Adverse business, financial, or economic conditions will likely impair this capacity.

CCC: Obligations rated ‘CCC’ are currently vulnerable to nonpayment and is dependent upon favorable business, financial, and economic conditions for the obligor to meet its financial commitment on the obligation. If adverse business, financial, or economic conditions occur, the obligor is not likely to have the capacity to meet its financial commitment on the obligation.

CC: Obligations rated ‘CC’ are currently highly vulnerable to nonpayment. The ‘CC’ rating is used when a default has not yet occurred but S&P Global Ratings expects default to be a virtual certainty, regardless of anticipated time to default.

C: The rating ‘C’ is highly vulnerable to nonpayment, the obligation is expected to have lower relative seniority or lower ultimate recovery compared to higher rated obligations.

D: Obligations rated ‘D’ are in default, or in breach of an imputed promise. For non-hybrid capital instruments, the ‘D’ rating category is used when payments on an obligation are not made on the date due, unless S&P Global Ratings believes that such payments will be made within five business days in the absence of a stated grace period or within the earlier of the stated grace period or 30 calendar days. The rating will also be used upon filing for bankruptcy petition or the taking of similar action and where default is a virtual certainty. If an obligation is subject to a distressed exchange offer the rating is lowered to ‘D’.

Plus (+) or Minus (-): The ratings from ‘AA’ to ‘CCC’ may be modified by the addition of a plus or minus sign to show relative standing within the major rating categories.

NR: Indicates that no rating has been requested, that there is insufficient information on which to base a rating or that S&P Global Ratings does not rate a particular type of obligation as a matter of policy.

SHORT-TERM CREDIT RATINGS: Ratings are graded into four categories, ranging from ‘A-1’ for the highest quality obligations to ‘D’ for the lowest.

A-1: This is the highest category. The obligor’s capacity to meet its financial commitment on the obligation is strong. Within this category, certain obligations are designated with a plus sign (+). This indicates that the obligor’s capacity to meet its financial commitment on these obligations is extremely strong.

A-2: Issues carrying this designation are somewhat more susceptible to the adverse effects of the changes in circumstances and economic conditions than obligations in higher rating categories. However, the obligor’s capacity to meet its financial commitment on the obligation is satisfactory.

A-3: Issues carrying this designation exhibit adequate capacity to meet their financial obligations. However, adverse economic conditions or changing circumstances are more likely to lead to a weakened capacity of the obligor to meet it financial commitment on the obligation.

B: Issues rated ‘B’ are regarded as vulnerable and have significant speculative characteristics. The obligor has capacity to meet financial commitments; however, it faces major ongoing uncertainties which could lead to obligor’s inadequate capacity to meet its financial obligations.

C: This rating is assigned to short-term debt obligations that are currently vulnerable to nonpayment and is dependent upon favorable business, financial, and economic conditions to meet its financial commitment on the obligation.

D: This rating indicates that the issue is either in default or in breach of an imputed promise. For non-hybrid capital instruments, the ‘D’ rating category is used when payments on an obligation are not made on the date due, unless S&P Global Ratings believes that such payments will be made within five business days in the absence of a stated grace period or within the earlier of the stated grace period or 30 calendar days. The rating will also be used upon filing for bankruptcy petition or the taking of similar action and where default is a virtual certainty. If an obligation is subject to a distressed exchange offer the rating is lowered to ‘D’.

MUNICIPAL SHORT-TERM NOTE RATINGS: S&P Global Ratings rates U.S. municipal notes with a maturity of less than three years as follows:

SP-1: A strong capacity to pay principal and interest. Issues that possess a very strong capacity to pay debt service is given a "+" designation.

SP-2: A satisfactory capacity to pay principal and interest, with some vulnerability to adverse financial and economic changes over the terms of the notes.

SP-3: A speculative capacity to pay principal and interest.

APPENDIX B – FINANCIAL HIGHLIGHTS

To be filed by amendment.

ADDITIONAL INFORMATION

Additional information about the Funds is available in the Statement of Additional Information dated November 1, 2021, as amended and restated __________________, which is incorporated by reference into this prospectus. Additional information about each Fund’s investments is available in the Fund’s annual and semi-annual reports to shareholders. In each Fund’s annual report, you will find a discussion of the market conditions and investment strategies that significantly affected the Fund’s performance during the last fiscal year. The Statement of Additional Information and each Fund’s annual and semi-annual reports can be obtained free of charge by writing Principal Exchange-Traded Funds, c/o ALPS Distributors, Inc., 1290 Broadway, Suite 1000, Denver, CO 80203. In addition, the Fund makes its Statement of Additional Information and annual and semi-annual reports available, free of charge, on our website www.principaletfs.com. To request this and other information about the Fund and to make shareholder inquiries, telephone 1-800-222-5852.

Reports and other information about the Fund are available on the EDGAR Database on the Commission’s internet site at www.sec.gov. Copies of this information may be obtained, upon payment of a duplicating fee, by electronic request at the following e-mail address: [email protected].

The Fund has entered into a management agreement with Principal Global Investors, LLC (“PGI”). The Fund and/or PGI, on behalf of the Funds, enter into contractual arrangements with various parties, including, among others, the Funds’ distributor, transfer agent and custodian, who provide services to the Funds. These arrangements are between the Fund and/or PGI and the applicable service provider. Shareholders are not parties to, or intended to be third-party beneficiaries of, any of these arrangements. Such arrangements are not intended to create in any individual shareholder or group of shareholders any right, including the right to enforce such arrangements against the service providers or to seek any remedy thereunder against PGI or any other service provider, either directly or on behalf of the Fund or any individual series (or fund).

This prospectus provides information that you should consider in determining whether to purchase shares of a Fund. This prospectus, the Statement of Additional Information, or the contracts that are exhibits to the Fund’s registration statement are not intended to give rise to any agreement or contract between the Fund and/or any fund and any investor, or give rise to any contract or other rights in any individual shareholder, group of shareholders or other person other than any rights conferred explicitly by federal or state securities laws that may not be waived.

The U.S. government does not insure or guarantee an investment in any Funds.

Shares of the Funds are not deposits or obligations of, or guaranteed or endorsed by, Principal Bank or any other financial institution, nor are shares of the Funds federally insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency.