497

PIMCO Active Bond Exchange-Traded Fund

Investment Objective

The Fund seeks current income and long-term capital appreciation, consistent with prudent investment management.

Fees and Expenses of the Fund

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

Shareholder Fees (fees paid directly from your investment):

N/A

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

Management Fees	0.55%
Other Expenses(1)	0.15%
Acquired Fund Fees and Expenses	0.01%
Total Annual Fund Operating Expenses	0.71%
Fee Waiver and/or Expense Reimbursement(2)	(0.01%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement(3)	0.70%

“Other Expenses” include interest expense of 0.15%. Interest expense is borne by the Fund separately from the management fees paid to Pacific Investment Management Company LLC (“PIMCO”). Excluding interest expense, Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement are 0.55%.

PIMCO has contractually agreed, through October 31, 2025, to waive the management fee it receives from the Fund in an amount equal to the actual amount of Underlying PIMCO Fund Fees indirectly incurred by the Fund in connection with its investments in Underlying PIMCO Funds up to a maximum waived amount that is equal to the Fund’s aggregate management fee. This waiver will automatically renew for one-year terms unless PIMCO provides written notice to the Trust at least 30 days prior to the end of the then current term.

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement do not match the Ratio of Expenses to Average Net Assets of the Fund, as set forth in the Financial Highlights table of the Fund’s prospectus, because the Ratio of Expenses to Average Net Assets reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.

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

1 Year	3 Years	5 Years	10 Years
$72	$226	$394	$882

Portfolio Turnover

shares are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example tables, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 351% of the average value of its portfolio.

Principal Investment Strategies

The Fund invests under normal circumstances at least 80% of its assets in a diversified portfolio of Fixed Income Instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts, or swap agreements. “Fixed Income Instruments” include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. The Fund will seek to maintain a fairly consistent level of dividend income, subject to market conditions, by investing in a broad array of fixed income sectors and utilizing income efficient implementation strategies. Long-term capital appreciation sought by the Fund generally arises from decreases in interest rates or improving credit fundamentals for a particular sector or security.

The Fund generally seeks to manage capital gain distributions by, among other things, limiting portfolio turnover and attempting to use losses from sales of securities that have declined in price to offset gains that would otherwise be taxable. However, such strategy may be unsuccessful or only partially successful and the Fund may realize taxable gains. For example, the Fund may realize taxable gains in order to satisfy cash redemption requests or when PIMCO believes the benefits of a transaction resulting in the realization of taxable gains outweigh tax considerations.

In pursuing the Fund’s investment objective, PIMCO may emphasize investment strategies that are more strategic, or long-term in nature, with less emphasis on short-term, tactical trading strategies. In addition, PIMCO will utilize a bottom up approach to seek to identify asset classes and securities that are undervalued, and the Fund’s investment program may involve a longer investment horizon designed to minimize trading volume and distinct investment strategies as compared with other PIMCO-advised funds with names, investment objectives and policies similar to the Fund. As a result, investments made by the Fund and the results achieved by the Fund at any given time are not expected to be the same as or similar to those made by such other PIMCO-advised funds.

The average portfolio duration of this Fund normally varies from two to eight years based on PIMCO’s market forecasts. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates.

The Fund invests primarily in investment grade debt securities, but may invest up to 30% of its total assets in high yield securities (“junk bonds”), as rated by Moody’s Investors Service, Inc. (“Moody’s”), Standard & Poor’s Ratings Services (“S&P”) or Fitch Ratings, Inc. (“Fitch”), or, if unrated, as determined by PIMCO. In the event that ratings services assign different ratings to the same security, PIMCO will use the highest rating as the credit rating for that security. The Fund may

PIMCO ETF Trust | Prospectus 1

PIMCO Active Bond Exchange-Traded Fund

invest up to 15% of its total assets in securities denominated in foreign currencies, and may invest beyond this limit in U.S. dollar-denominated securities of foreign issuers. The Fund may invest up to 15% of its total assets in securities and instruments that are economically tied to emerging market countries. The Fund will normally limit its foreign currency exposure (from non-U.S. dollar-denominated securities or currencies) to 10% of its total assets.

The Fund may invest, without limitation, in derivative instruments, such as options, futures contracts or swap agreements, or in mortgage- or asset-backed securities, subject to applicable law and any other restrictions described in the Fund’s prospectus or Statement of Additional Information. The Fund may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis and may engage in short sales. The Fund may invest up to 10% of its total assets in preferred securities, convertible securities and other equity related securities.

The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls).

Principal Risks

It is possible to lose money on an investment in the Fund. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are listed below.

Market Trading Risk: the risk that an active secondary trading market for Fund shares does not continue once developed, that the Fund may not continue to meet a listing exchange’s trading or listing requirements, that trading in Fund shares may be halted or become less liquid or that Fund shares trade at prices other than the Fund’s net asset value, and are subject to trading costs, which may be exacerbated if the creation/redemption process becomes less effective, particularly during times of market stress

Interest Rate Risk: the risk that fixed income securities will fluctuate in value because of a change in interest rates; a fund with a longer average portfolio duration will be more sensitive to changes in interest rates than a fund with a shorter average portfolio duration

Call Risk: the risk that an issuer may exercise its right to redeem a fixed income security earlier than expected (a call). Issuers may call outstanding securities prior to their maturity for a number of reasons (e.g., declining interest rates, changes in credit spreads and improvements in the issuer’s credit quality). If an issuer calls a security that the Fund has invested in, the Fund may not recoup the full amount of its initial investment or may not realize the full anticipated earnings from the investment and may be forced to reinvest in lower-yielding securities, securities with greater credit risks or securities with other, less favorable features

or is perceived (whether by market participants, rating agencies, pricing services or otherwise) as unable or unwilling, to meet its financial obligations

High Yield Risk: the risk that high yield securities and unrated securities of similar credit quality (commonly known as “junk bonds”) are subject to greater levels of credit, call and liquidity risks. High yield securities are considered primarily speculative with respect to the issuer’s continuing ability to make principal and interest payments, and may be more volatile than higher-rated securities of similar maturity

Market Risk: the risk that the value of securities owned by the Fund may go up or down, sometimes rapidly or unpredictably, due to factors affecting securities markets generally or particular industries

Issuer Risk: the risk that the value of a security may decline for a reason directly related to the issuer, such as management performance, changes in financial condition or credit rating, financial leverage, reputation or reduced demand for the issuer’s goods or services

Liquidity Risk: the risk that a particular investment may be difficult to purchase or sell and that the Fund may be unable to sell illiquid investments at an advantageous time or price or achieve its desired level of exposure to a certain sector. Liquidity risk may result from the lack of an active market, reduced number and capacity of traditional market participants to make a market in fixed income securities, and may be magnified in a rising interest rate environment or other circumstances where investor redemptions from fixed income funds may be higher than normal, causing increased supply in the market due to selling activity

Derivatives Risk: the risk of investing in derivative instruments (such as forwards, futures, swaps and structured securities) and other similar investments, including leverage, liquidity, interest rate, market, counterparty (including credit), operational, legal and management risks and valuation complexity. Changes in the value of a derivative or other similar investment may not correlate perfectly with, and may be more sensitive to market events than, the underlying asset, rate or index, and the Fund could lose more than the initial amount invested. Changes in the value of a derivative or other similar instrument may also create margin delivery or settlement payment obligations for the Fund. The Fund’s use of derivatives or other similar investments may result in losses to the Fund, a reduction in the Fund’s returns and/or increased volatility. Non-centrally-cleared over-the-counter (“OTC”) derivatives or other similar investments are also subject to the risk that a counterparty to the transaction will not fulfill its contractual obligations to the other party, as many of the protections afforded to centrally-cleared derivative transactions might not be available for non-centrally-cleared OTC derivatives or other similar investments. The primary credit risk on derivatives or other similar investments that are exchange-traded or traded through a central clearing counterparty resides with the Fund's clearing broker or the clearinghouse. Changes in regulation relating to a registered fund’s use of derivatives and related instruments could potentially limit or impact the Fund’s ability to invest in derivatives, limit the Fund’s ability to employ certain strategies that use derivatives or

2 Prospectus | PIMCO ETF Trust

Prospectus

other similar investments and/or adversely affect the value of derivatives or other similar investments and the Fund’s performance

Equity Risk: the risk that the value of equity or equity-related securities, including preferred securities, may decline due to general market conditions which are not specifically related to a particular company or to factors affecting a particular industry or industries. Equity or equity-related securities generally have greater price volatility than fixed income securities. In addition, preferred securities may be subject to greater credit risk or other risks, such as risks related to deferred and omitted distributions, limited voting rights, liquidity, interest rates, regulatory changes and special redemption rights

Mortgage-Related and Other Asset-Backed Securities Risk: the risks of investing in mortgage-related and other asset-backed securities, including interest rate risk, extension risk, prepayment risk and credit risk. The Fund may invest in any tranche of mortgage-related and other asset-backed securities, including junior and/or equity tranches (to the extent consistent with other of the Fund's guidelines), which generally carry higher levels of the foregoing risks

Foreign (Non-U.S.) Investment Risk: the risk that investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to smaller markets, differing reporting, accounting and auditing standards, increased risk of delayed settlement of portfolio transactions or loss of certificates of portfolio securities, and the risk of unfavorable foreign government actions, including nationalization, expropriation or confiscatory taxation, currency blockage, political changes, diplomatic developments or the imposition of sanctions and other similar measures. Foreign securities may also be less liquid and more difficult to value than securities of U.S. issuers

Emerging Markets Risk: the risk of investing in emerging market securities, primarily increased foreign (non-U.S.) investment risk

Currency Risk: the risk that foreign (non-U.S.) currencies will change in value relative to the U.S. dollar and affect the Fund’s investments in foreign (non-U.S.) currencies or in securities that trade in, and receive revenues in, or in derivatives that provide exposure to, foreign (non-U.S.) currencies

Leveraging Risk: the risk that certain transactions of the Fund, such as reverse repurchase agreements, loans of portfolio securities, and the use of when-issued, delayed delivery or forward commitment transactions, or derivative instruments, may give rise to leverage, magnifying gains and losses and causing the Fund to be more volatile than if it had not been leveraged. This means that leverage entails a heightened risk of loss

Management Risk: the risk that the investment techniques and risk analyses applied by PIMCO will not produce the desired results and that actual or potential conflicts of interest, legislative, regulatory, or tax restrictions, policies or developments may affect the investment techniques available to PIMCO and the individual portfolio managers in connection with managing the Fund and may cause PIMCO to restrict or

prohibit participation in certain investments. There is no guarantee that the investment objective of the Fund will be achieved

Short Exposure Risk: the risk of entering into short sales or other short positions, including the potential loss of more money than the actual cost of the investment, and the risk that the third party to the short sale or other short position will not fulfill its contractual obligations, causing a loss to the Fund

Convertible Securities Risk: as convertible securities share both fixed income and equity characteristics, they are subject to risks to which fixed income and equity investments are subject. These risks include equity risk, interest rate risk and credit risk

Tax-Efficient Investing Risk: the risk that investment strategies intended to manage capital gain distributions may not succeed, and that such strategies may reduce investment returns or result in investment losses

Distribution Rate Risk: the risk that the Fund’s distribution rate may change unexpectedly as a result of numerous factors, including changes in realized and projected market returns, fluctuations in market interest rates, Fund performance and other factors

Collateralized Loan Obligations Risk: the risk that investing in collateralized loan obligations (“CLOs”) and other similarly structured investments exposes the Fund to heightened credit risk, interest rate risk, liquidity risk, market risk and prepayment and extension risk, as well as the risk of default on the underlying asset. In addition, investments in CLOs carry additional risks including, but not limited to: (i) the possibility that distributions from collateral securities will not be adequate to make interest or other payments; (ii) the quality of the collateral may decline in value or default; (iii) risks related to the capability of the servicer of the securitized assets; (iv) the risk that the Fund may invest in tranches of CLOs that are subordinate to other tranches; (v) the structure and complexity of the transaction and the legal documents may not be fully understood at the time of investment and could lead to disputes with the issuer or among investors regarding the characterization of proceeds or unexpected investment results; and (vi) the CLO's manager may perform poorly

Please see “Description of Principal Risks” in the Fund's prospectus for a more detailed description of the risks of 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.

Performance Information

The performance information shows summary performance information for the Fund in a bar chart and an Average Annual Total Returns table. The information provides some indication of the risks of investing in the Fund by showing changes in its performance from year to year and by showing how the Fund’s average annual returns compare with the returns of a broad-based securities market index (i.e., a regulatory index). Absent any applicable fee waivers and/or expense limitations,

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 3

PIMCO Active Bond Exchange-Traded Fund

performance would have been lower. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.

In addition to the Fund’s performance, the Average Annual Total Returns table includes performance of a regulatory index. It is not possible to invest directly in an unmanaged index. Effective July 24, 2024, the Fund’s regulatory index is the Bloomberg U.S. Aggregate Index. The Fund’s regulatory index is shown in connection with certain regulatory requirements to provide a broad measure of market performance. The Bloomberg U.S. Aggregate Index represents securities that are SEC-registered, taxable, and dollar denominated. The index covers the U.S. investment grade fixed rate bond market, with index components for government and corporate securities, mortgage pass-through securities, and asset-backed securities. These major sectors are subdivided into more specific indices that are calculated and reported on a regular basis.

Performance for the Fund is updated daily and quarterly and may be obtained as follows: daily and quarterly updates on the net asset value and performance page at https://www.pimco.com/en-us/investments/etf.

Calendar Year Total Returns

Best Quarter	December 31, 2023	6.62%
Worst Quarter	March 31, 2022	-6.38%
Year-to-Date	September 30, 2024	5.71%

Average Annual Total Returns (for periods ended 12/31/23)

	1 Year	5 Years	10 Years
Return Before Taxes	6.33%	1.12%	2.10%
Return After Taxes on Distributions(1)	4.55%	-0.19%	0.69%
Return After Taxes on Distributions and Sales of Fund Shares(1)	3.71%	0.32%	1.02%
Bloomberg U.S. Aggregate Index (reflects no deductions for fees, expenses or taxes)	5.53%	1.10%	1.81%

After-tax returns are calculated using the highest historical 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, and 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. In some cases the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.

Investment Adviser/Portfolio Managers

PIMCO serves as the investment adviser for the Fund. The Fund’s portfolio is jointly and primarily managed by David Braun, Jerome Schneider and Daniel Hyman. Messrs. Braun, Schneider and Hyman are Managing Directors of PIMCO, and they have managed the Fund since May 2017.

Other Important Information Regarding Fund Shares

For important information about purchase and sale of Fund shares, tax information, and payments to broker-dealers and other financial intermediaries, please turn to the “Summary of Other Important Information Regarding Fund Shares” section on page 47 of this prospectus.

4 Prospectus | PIMCO ETF Trust

PIMCO Commodity Strategy Active Exchange-Traded Fund

Investment Objective

The Fund seeks total return which exceeds that of the Bloomberg Commodity Index Total Return, consistent with prudent investment management.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment):

N/A

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

Management Fees	0.79%
Other Expenses(1)	0.01%
Acquired Fund Fees and Expenses	0.12%
Total Annual Fund Operating Expenses	0.92%
Fee Waiver and/or Expense Reimbursement(2)(3)(4)	(0.27%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement(6)	0.65%

“Other Expenses” include interest expense of 0.01%. Interest expense is borne by the Fund separately from the management fees paid to Pacific Investment Management Company LLC (“PIMCO”). Excluding interest expense, Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement are 0.64%.

Pacific Investment Management Company LLC (“PIMCO”) has contractually agreed, through October 31, 2025, to reduce its management fee by 0.15% of the average daily net assets of the Fund. This waiver will automatically renew for one-year terms unless PIMCO provides written notice to PIMCO ETF Trust at least 30 days prior to the end of the then current term.In any month in which the investment management agreement is in effect, PIMCO is entitled to reimbursement by the Fund of any portion of the management fee waived as set forth above (the “Fee Waiver Reimbursement Amount”) during the previous thirty-six months from the time of the waiver, provided that such amount paid to PIMCO will not: 1) together with any recoupment of organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustee fees pursuant to the Expense Limitation Agreement, exceed the Expense Limit (calculated as a percentage of average daily net assets) (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit); 2) exceed the total Fee Waiver Reimbursement Amount; or 3) include any amounts previously reimbursed to PIMCO.

PIMCO has contractually agreed, through October 31, 2025, to waive its management fee, or reimburse the Fund, to the extent that organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustees’ fees exceed 0.0049% of the Fund’s average net assets (the “Expense Limit”). Under the Expense Limitation Agreement, which renews annually for a full year unless terminated by PIMCO upon at least 30 days’ notice prior to the end of the contract term, PIMCO may recoup these waivers and reimbursements in future periods, not exceeding three years, provided that organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustees’ fees, plus recoupment, do not exceed the Expense Limit (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit).

PIMCO has contractually agreed to waive the Fund’s management fee in an amount equal to the management fee paid by the PIMCO Cayman Commodity Fund CMDT, Ltd. (the “Subsidiary”) to PIMCO. The Subsidiary pays PIMCO a management fee at the

annual rate of 0.69% of its net assets. This waiver may not be terminated by PIMCO and will remain in effect for as long as PIMCO’s contract with the Subsidiary is in place.

1 Year	3 Years	5 Years	10 Years
$66	$266	$483	$1,107

Portfolio Turnover

The Fund pays transaction costs when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example tables, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 50% of the average value of its portfolio.

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing, under normal circumstances, in commodity-linked derivative instruments backed by an actively managed and diversified portfolio of Fixed Income Instruments of varying maturities and may also invest directly in commodities. “Fixed Income Instruments” include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public-or private-sector entities.

The Fund invests in commodity-linked derivative instruments, including swap agreements, futures, options on futures, commodity index-linked notes and commodity options that provide exposure to the investment returns of the commodities futures markets. Commodities are assets that have tangible properties, such as oil, metals, carbon and agricultural products. The value of commodity-linked derivative instruments may be affected by overall market movements and other factors affecting the value of a particular industry or commodity, such as weather, disease, embargoes, or political and regulatory developments. When determining the target allocation for the strategy, PIMCO may

PIMCO ETF Trust | Prospectus 5

PIMCO Commodity Strategy Active Exchange-Traded Fund

use proprietary quantitative models. The target allocations may include long, short, or no positions in the underlying financial markets and commodities specified in the models. The quantitative models are developed and maintained by PIMCO, and are subject to change over time without notice in PIMCO’s discretion. PIMCO also retains discretion over the final target asset allocation and the implementation of the target asset allocation, which may include positions that are different from target allocations determined by quantitative models.

The Fund will seek to gain exposure to the commodity futures markets primarily through investments in swap agreements and futures, and through investments in the PIMCO Cayman Commodity Fund CMDT, Ltd., a wholly-owned subsidiary of the Fund organized under the laws of the Cayman Islands (the “Subsidiary”). In order to comply with certain issuer diversification limits imposed by the Internal Revenue Code, the Fund may invest up to 25% of its total assets in the Subsidiary. The Subsidiary is advised by PIMCO, and has the same investment objective as the Fund. As discussed in greater detail elsewhere in the prospectus, the Subsidiary (unlike the Fund) may invest without limitation in commodity-linked swap agreements, other commodity-linked derivative instruments and directly in commodities. The derivative instruments in which the Fund and the Subsidiary primarily intend to invest are instruments linked to certain commodity indices and instruments linked to the value of a particular commodity or commodity futures contract, or a subset of commodities or commodity futures contracts. These instruments may specify exposure to commodity futures with different roll dates, reset dates or contract months than those specified by a particular commodity index. As a result, the commodity-linked derivatives component of the Fund’s portfolio may deviate from the returns of any particular commodity index. The Fund or the Subsidiary may over-weight or under-weight its exposure to a particular commodity index, or a subset of commodities, such that the Fund has greater or lesser exposure to that index than the value of the Fund’s net assets, or greater or lesser exposure to a subset of commodities than is represented by a particular commodity index. Under normal circumstances, the Fund will invest in commodity-linked derivative instruments and commodities that, in the aggregate, provide the Fund with notional exposure to commodities within 20% (plus or minus) of the value of the Fund's net assets.

The Fund may also invest in leveraged or unleveraged commodity index-linked notes, which are derivative debt instruments with principal and/or coupon payments linked to the performance of commodity indices. These commodity index-linked notes are sometimes referred to as “structured notes” because the terms of these notes may be structured by the issuer and the purchaser of the note. The value of these notes will rise or fall in response to changes in the underlying commodity or related index of investment.

Assets not invested in commodity-linked derivative instruments or the Subsidiary may be invested in Fixed Income Instruments, as well as derivative instruments, such as forwards, options, futures contracts and swap agreements, relating to Fixed Income Instruments, equity securities or currencies. The average portfolio duration of the fixed income portion of this Fund will vary based on PIMCO’s market

forecasts and under normal market conditions is not expected to exceed one year. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates. The Fund's investments in Fixed Income Instruments are generally expected to consist of investment grade securities that are rated at least Baa3 by Moody’s Investors Service, Inc. (“Moody’s”) or equivalently rated by Standard & Poor’s Ratings Services (“S&P”) or Fitch Ratings, Inc. (“Fitch”), or, if unrated, determined by PIMCO to be of comparable quality (except such limitation shall not apply to the Fund’s investments in mortgage- and asset-backed securities). In the event that ratings services assign different ratings to the same security, PIMCO will use the highest rating as the credit rating for that security. With respect to the Fund’s fixed income investments, the Fund may invest up to 20% of its total assets in securities denominated in foreign currencies and may invest without limit in U.S. dollar-denominated securities of foreign issuers. With respect to the Fund’s fixed income investments, the Fund will normally limit its foreign currency exposure (from non-U.S. dollar-denominated securities or currencies) to 10% of its total assets. With respect to the Fund’s investment in commodities, equity securities or currencies, the Fund may invest without limitation in non-U.S. issuers and non-U.S. denominated securities or currencies. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls). The Fund may purchase and sell securities on a when-issued, delayed delivery or forward commitment basis and may engage in short sales.

In pursuing the Fund’s investment objective, PIMCO may emphasize investment strategies that are more strategic, or long-term in nature, with less emphasis on short-term, tactical trading strategies. In addition, PIMCO will utilize a bottom up approach to seek to identify sectors and securities that are undervalued, and the Fund’s investment program may involve a longer investment horizon designed to minimize trading volume and distinct investment strategies as compared with other PIMCO-advised funds with names, investment objectives and policies similar to the Fund. As a result, investments made by the Fund and the results achieved by the Fund at any given time are not expected to be the same as or similar to those made by such other PIMCO-advised funds.

The Fund is non-diversified, which means that it may invest its assets in a smaller number of issuers than a diversified fund. In addition, the Fund may invest its assets in particular sectors of the commodities futures market.

Principal Risks

It is possible to lose money on an investment in the Fund. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are listed below.

6 Prospectus | PIMCO ETF Trust

Prospectus

evaluate and new funds may not attract sufficient assets to achieve investment and trading efficiencies

Commodity Risk: the risk that investing in commodity-linked derivative instruments and commodities, either directly or through the Subsidiary, may subject the Fund to greater volatility than investments in traditional securities. The value of commodity-linked derivative instruments or commodities may be affected by changes in overall market movements, foreign currency exchange rates, commodity index volatility, changes in inflation or interest rates, or supply and demand factors affecting a particular industry or commodity market, such as drought, floods, weather, livestock disease, pandemics and public health emergencies, embargoes, taxation, war, terrorism, cyber hacking, economic and political developments, environmental proceedings, tariffs, changes in storage costs, availability of transportation systems, and international economic, political and regulatory developments. Investments in commodities can also present risks associated with delivery, custody, storage and maintenance, illiquidity, and the unavailability of accurate market valuations of the commodity

Credit Risk: the risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to a derivative contract, or the issuer or guarantor of collateral, is unable or unwilling, or is perceived (whether by market participants, rating agencies, pricing services or otherwise) as unable or unwilling, to meet its financial obligations

Oil-Related Risk: the risk that investments in or tied to the price of oil may fluctuate substantially over short periods of time or be more volatile than other types of investments due to, among other things, national and international political changes, policies of Organization of

the Petroleum Exporting Countries (“OPEC”) and other oil exporting countries, changes in relationships among OPEC and other oil exporting countries and oil importing countries, regulatory changes, taxation policies and the economies of key energy-consuming countries

Gold-Related Risk: the risk that investments in or tied to the price of gold may fluctuate substantially over short periods of time or be more volatile than other types of investments due to, among other matters, changes in interest rates or inflation expectations or other economic, financial and political factors in the U.S. and foreign (non-U.S.) countries

Derivatives Risk: the risk of investing in derivative instruments (such as forwards, futures, swaps and structured securities) and other similar investments, including leverage, liquidity, interest rate, market, counterparty (including credit), operational, legal and management risks, and valuation complexity. Changes in the value of a derivative or other similar investment may not correlate perfectly with, and may be more sensitive to market events than, the underlying asset, rate or index, and the Fund could lose more than the initial amount invested. Changes in the value of a derivative or other similar instrument may also create margin delivery or settlement payment obligations for the Fund. The Fund’s use of derivatives or other similar investments may result in losses to the Fund, a reduction in the Fund’s returns and/or increased volatility. Non-centrally-cleared over-the-counter (“OTC”) derivatives or other similar investments are also subject to the risk that a counterparty to the transaction will not fulfill its contractual obligations to the other party, as many of the protections afforded to centrally-cleared derivative transactions might not be available for non-centrally-cleared OTC derivatives or other similar investments. The primary credit risk on derivatives or other similar investments that are exchange-traded or traded through a central clearing counterparty resides with the Fund's clearing broker or the clearinghouse. Changes in regulation relating to a registered fund’s use of derivatives and related instruments could potentially limit or impact the Fund’s ability to invest in derivatives, limit the Fund’s ability to employ certain strategies that use derivatives or other similar investments and/or adversely affect the

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 7

PIMCO Commodity Strategy Active Exchange-Traded Fund

value of derivatives or other similar investments and the Fund’s performance

Issuer Non-Diversification Risk: the risk of focusing investments in a small number of issuers, including being more susceptible to risks associated with a single economic, political or regulatory occurrence than a more diversified portfolio might be. Funds that are “non-diversified” may invest a greater percentage of their assets in the securities of a single issuer (such as bonds issued by a particular state) than funds that are “diversified”

Model Risk: the risk that the Fund’s investment models used in making investment allocation decisions may not adequately take into account certain factors, or may contain design flaws or faulty assumptions, and may rely on incomplete or inaccurate data inputs, any of which may result in a decline in the value of an investment in the Fund

Sovereign Debt Risk: the risk that investments in fixed income instruments issued by sovereign entities may decline in value as a result of default or other adverse credit event resulting from an issuer’s inability or unwillingness to make principal or interest payments in a timely fashion

than if it had not been leveraged. This means that leverage entails a heightened risk of loss

Tax Risk: the risk that the tax treatment of swap agreements and other derivative instruments, such as commodity-linked derivative instruments, including commodity index-linked notes, swap agreements, commodity options, futures, and options on futures, may be affected by future regulatory or legislative changes that could affect whether income from such investments is “qualifying income” under Subchapter M of the Internal Revenue Code, or otherwise affect the character, timing and/or amount of the Fund’s taxable income or gains and distributions

Subsidiary Risk: the risk that, by investing in the Subsidiary, the Fund is indirectly exposed to the risks associated with the Subsidiary’s investments. The Subsidiary is not registered under the Investment Company Act of 1940, as amended the “1940 Act”) and may not be subject to all the investor protections of the 1940 Act. There is no guarantee that the investment objective of the Subsidiary will be achieved

Performance Information

The Fund does not have a full calendar year of performance. Thus, no bar chart or Average Annual Total Returns table is included for the Fund. Performance for the Fund will be updated daily and quarterly and may be obtained as follows: daily and quarterly updates on the net asset value and performance page at https://www.pimco.com/en-us/investments/etf.

Effective July 24, 2024, the Fund’s regulatory index is the S&P 500 Index. The Fund’s regulatory index is disclosed in connection with certain regulatory requirements to provide a broad measure of market performance. The S&P 500 Index is an unmanaged market index generally considered representative of the stock market as a whole. The S&P 500 Index is composed of 500 selected common stocks that represent approximately two-thirds of the total market value of all

8 Prospectus | PIMCO ETF Trust

PIMCO Enhanced Low Duration Active Exchange-Traded Fund

Investment Objective

The Fund seeks maximum total return, consistent with preservation of capital and prudent investment management.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment):

N/A

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

Management Fees	0.46%
Other Expenses(1)	0.04%
Total Annual Fund Operating Expenses	0.50%

“Other Expenses” include interest expense of 0.04%. Interest expense is borne by the Fund separately from the management fees paid to Pacific Investment Management Company LLC (“PIMCO”). Excluding interest expense, Total Annual Fund Operating Expenses are 0.46%.

1 Year	3 Years	5 Years	10 Years
$51	$160	$280	$628

Portfolio Turnover

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing under normal circumstances at least 80% of its net assets in a diversified portfolio of Fixed Income Instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts, or swap agreements. “Fixed Income Instruments” include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. The average portfolio

duration of this Fund normally varies from one to three years based on PIMCO’s market forecasts. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates. The Fund will seek to maintain a fairly consistent level of dividend income, subject to market conditions, by investing in a broad array of fixed income sectors and utilizing income efficient implementation strategies.

The Fund invests primarily in investment grade debt securities, but may invest up to 15% of its total assets in high yield securities (“junk bonds”), as rated by Moody’s Investors Service, Inc. (“Moody’s”), Standard & Poor’s Ratings Services (“S&P”) or Fitch Ratings, Inc. (“Fitch”), or, if unrated, as determined by PIMCO. In the event that ratings services assign different ratings to the same security, PIMCO will use the highest rating as the credit rating for that security. The Fund may invest, without limitation, in U.S. dollar denominated securities and instruments of foreign issuers. The Fund will normally limit its foreign currency exposure (such as from non-U.S. dollar-denominated currencies) to 5% of its total assets. The Fund may invest up to 10% of its total assets in securities and instruments that are economically tied to emerging market countries.

The Fund may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis and may engage in short sales. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques

10 PIMCO ETF Trust | Prospectus

Prospectus

(such as buy backs or dollar rolls). The “total return” sought by the Fund consists of income earned on the Fund’s investments, plus capital appreciation, if any, which generally arises from decreases in interest rates, foreign currency appreciation, or improving credit fundamentals for a particular sector or security.

Principal Risks

It is possible to lose money on an investment in the Fund. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are listed below.

Issuer Risk: the risk that the value of a security may decline for a reason directly related to the issuer, such as management performance,

changes in financial condition or credit rating, financial leverage, reputation or reduced demand for the issuer’s goods or services

Derivatives Risk: the risk of investing in derivative instruments (such as forwards, futures, swaps and structured securities) and other similar investments, including leverage, liquidity, interest rate, market, counterparty (including credit), operational, legal and management risks, and valuation complexity. Changes in the value of a derivative or other similar investment may not correlate perfectly with, and may be more sensitive to market events than, the underlying asset, rate or index, and the Fund could lose more than the initial amount invested. Changes in the value of a derivative or other similar instrument may also create margin delivery or settlement payment obligations for the Fund. The Fund’s use of derivatives or other similar investments may result in losses to the Fund, a reduction in the Fund’s returns and/or increased volatility. Non-centrally-cleared over-the-counter (“OTC”) derivatives or other similar investments are also subject to the risk that a counterparty to the transaction will not fulfill its contractual obligations to the other party, as many of the protections afforded to centrally-cleared derivative transactions might not be available for non-centrally-cleared OTC derivatives or other similar investments. The primary credit risk on derivatives or other similar investments that are exchange-traded or traded through a central clearing counterparty resides with the Fund's clearing broker or the clearinghouse. Changes in regulation relating to a registered fund’s use of derivatives and related instruments could potentially limit or impact the Fund’s ability to invest in derivatives, limit the Fund’s ability to employ certain strategies that use derivatives or other similar investments and/or adversely affect the value of derivatives or other similar investments and the Fund’s performance

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 11

PIMCO Enhanced Low Duration Active Exchange-Traded Fund

settlement of portfolio transactions or loss of certificates of portfolio securities, and the risk of unfavorable foreign government actions, including nationalization, expropriation or confiscatory taxation, currency blockage, political changes, diplomatic developments or the imposition of sanctions and other similar measures. Foreign securities may also be less liquid and more difficult to value than securities of U.S. issuers

Emerging Markets Risk: the risk of investing in emerging market securities, primarily increased foreign (non-U.S.) investment risk

adequate to make interest or other payments; (ii) the quality of the collateral may decline in value or default; (iii) risks related to the capability of the servicer of the securitized assets; (iv) the risk that the Fund may invest in tranches of CLOs that are subordinate to other tranches; (v) the structure and complexity of the transaction and the legal documents may not be fully understood at the time of investment and could lead to disputes with the issuer or among investors regarding the characterization of proceeds or unexpected investment results; and (vi) the CLO's manager may perform poorly

Performance Information

The performance information shows summary performance information for the Fund in a bar chart and an Average Annual Total Returns table. The information provides some indication of the risks of investing in the Fund by showing changes in its performance from year to year and by showing how the Fund’s average annual returns compare with the returns of certain indexes. Absent any applicable fee waivers and/or expense limitations, performance would have been lower. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.

In addition to the Fund’s performance, the Average Annual Total Returns table includes performance of: (i) a broad-based securities market index (i.e., a regulatory index) and (ii) a supplemental index. It is not possible to invest directly in an unmanaged index. Effective July 24, 2024, the Fund’s regulatory index is the Bloomberg U.S. Aggregate Index. The Fund’s regulatory index is shown in connection with certain regulatory requirements to provide a broad measure of market performance. The Bloomberg U.S. Aggregate Index represents securities that are SEC-registered, taxable, and dollar denominated. The index covers the U.S. investment grade fixed rate bond market, with index components for government and corporate securities, mortgage pass-through securities, and asset-backed securities. These major sectors are subdivided into more specific indices that are calculated and reported on a regular basis. The ICE BofA 1-3 Year U.S. Treasury Index is a supplemental index of the Fund. The ICE BofA 1-3 Year U.S. Treasury Index is an unmanaged index comprised of U.S. Treasury securities, other than inflation-protection securities and Separate Trading of Registered Interest and Principal of Securities, with at least $1 billion in outstanding face value and a remaining term to final maturity of at least one year and less than three years.

12 Prospectus | PIMCO ETF Trust

Prospectus

Calendar Year Total Returns

Best Quarter	June 30, 2020	4.16%
Worst Quarter	March 31, 2022	-2.96%
Year-to-Date	September 30, 2024	4.57%

Average Annual Total Returns (for periods ended 12/31/23)

	1 Year	5 Years	Since Inception	Inception Date
Return Before Taxes	4.86%	1.73%	1.90%	1/22/2014
Return After Taxes on Distributions(1)	3.11%	0.70%	0.88%
Return After Taxes on Distributions and Sales of Fund Shares(1)	2.85%	0.88%	1.01%
Bloomberg U.S. Aggregate Index (reflects no deductions for fees, expenses or taxes)	5.53%	1.10%	1.75%
ICE BofA 1-3 Year U.S. Treasury Index (reflects no deductions for fees, expenses or taxes)	4.26%	1.30%	1.06%

Investment Adviser/Portfolio Managers

PIMCO serves as the investment adviser for the Fund. The Fund’s portfolio is jointly and primarily managed by Jerome Schneider, David Braun and Sonali Pier. Messrs. Schneider and Braun and Ms. Pier are Managing Directors of PIMCO. Mr. Schneider has managed the Fund since January 2014. Mr. Braun has managed the Fund since May 2017. Ms. Pier has managed the Fund since July 2019.

Other Important Information Regarding Fund Shares

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 13

PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund

Investment Objective

The Fund seeks maximum current income, consistent with preservation of capital and daily liquidity, while incorporating PIMCO's ESG investment strategy.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment):

N/A

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

Management Fees	0.36%
Total Annual Fund Operating Expenses	0.36%
Fee Waiver and/or Expense Reimbursement(1)	(0.12%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	0.24%

Pacific Investment Management Company LLC (“PIMCO”) has contractually agreed, through October 31, 2025, to reduce its management fee by 0.12% of the average daily net assets of the Fund. This waiver will automatically renew for one-year terms unless PIMCO provides written notice to PIMCO ETF Trust at least 30 days prior to the end of the then current term. In any month in which the investment management agreement is in effect, PIMCO is entitled to reimbursement by the Fund of any portion of the management fee waived as set forth above (the “Fee Waiver Reimbursement Amount”) within thirty-six months of the time of the waiver, provided that such amount paid to PIMCO will not: 1) together with any recoupment of organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustee fees pursuant to the Expense Limitation Agreement, exceed 0.0049% (the “Expense Limit”) (calculated as a percentage of average daily net assets) (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit); 2) exceed the total Fee Waiver Reimbursement Amount; or 3) include any amounts previously reimbursed to PIMCO.

1 Year	3 Years	5 Years	10 Years
$25	$104	$190	$444

Portfolio Turnover

reflected in the Annual Fund Operating Expenses or in the Example tables, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 73% of the average value of its portfolio.

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing under normal circumstances at least 80% of its net assets in a diversified portfolio of Fixed Income Instruments of varying maturities, which may be represented by forwards. “Fixed Income Instruments” include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. The average portfolio duration of this Fund will vary based on PIMCO’s market forecasts and will normally not exceed one year. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates. The dollar-weighted average portfolio maturity of the Fund is normally not expected to exceed three years.

The Fund may avoid investment in the securities of issuers whose business practices with respect to the environment, social responsibility, and governance (“ESG practices”) do not meet criteria determined by PIMCO. In determining the efficacy of an issuer’s ESG practices, PIMCO will use its own proprietary assessments of material ESG issues and may also reference standards as set forth by recognized global organizations such as entities sponsored by the United Nations, among others, and augment its assessments based on engagements with issuers regarding their ESG practices that have the potential to enhance risk-adjusted returns. PIMCO’s activities in this respect may include, but are not limited to, direct dialogue with company management, such as through in-person meetings, phone calls, electronic communications, and letters. The Fund may invest in securities of issuers whose ESG practices are weaker relative to certain peers or industry benchmarks, with the expectation that these practices may improve over time. It may also exclude those issuers that are not receptive to PIMCO’s engagement efforts, as determined in PIMCO’s sole discretion.

The Fund will not invest in the securities of any non-governmental issuer determined by PIMCO to be engaged principally in the (1) manufacture of alcoholic beverages, tobacco products or military equipment, (2) operation of gambling casinos, (3) production or distribution of adult entertainment materials, (4) oil industry, including extraction, production, and refining or (5) production, distribution of coal and coal fired generation. Notwithstanding the restrictions set forth above, the Fund can invest in the securities of any issuer determined by PIMCO to be engaged principally in biofuel production, natural gas generation and sales and trading activities. The Fund may also invest in labeled green, sustainability, social and sustainability-linked bonds from issuers involved in fossil fuel-related sectors. Labeled bonds are those issues with proceeds specifically earmarked to be used for climate (often referred to as “green bonds”), environmental sustainability and/or social projects and, in the case of sustainability-linked bonds, bonds that include sustainability-linked covenants, as explained by the issuer through use of a framework and/or legal documentation. Labeled bonds

14 PIMCO ETF Trust | Prospectus

Prospectus

are often verified by a third party, which certifies that the bond will or has been used to fund projects that include eligible benefits or, in the case of a sustainability-linked bond, that the bond includes sustainability-linked covenants. To the extent possible on the basis of information available to PIMCO, an issuer will be deemed to be principally engaged in an activity if it derives more than 10% of its gross revenues from such activities (or such more restrictive threshold or exclusionary screen (i.e., a lower gross revenue threshold), as may be determined by PIMCO from time to time).

In analyzing whether an issuer meets any of the criteria described above, PIMCO may rely upon, among other things, information provided by an independent third party.

The Fund primarily invests in U.S. dollar-denominated investment grade debt securities, rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or equivalently rated by Standard & Poor’s Ratings Services (“S&P”) or Fitch Ratings, Inc. (“Fitch”), or, if unrated, determined by PIMCO to be of comparable quality. In the event that ratings services assign different ratings to the same security, PIMCO will use the highest rating as the credit rating for that security. The Fund may invest, without limitation, in U.S. dollar-denominated securities and instruments of foreign issuers. The Fund may invest up to 10% of its total assets in securities denominated in foreign currencies. The Fund seeks to eliminate foreign (non-U.S.) currency exposure (from non-U.S. dollar-denominated securities or currencies) through hedging techniques, although the Fund may have limited amounts of foreign (non-U.S.) currency exposure due to the difficulty in perfectly hedging such exposures.

The Fund may invest, without limitation, in futures contracts, subject to applicable law and any other restrictions described in the Fund's prospectus or Statement of Additional Information. The Fund may invest in mortgage or asset-backed securities (issuers of which will not be treated as subject to the non-governmental issuer screens described herein), including to-be-announced transactions which may include exposure to issuers that the Fund is not permitted to invest in directly. The Fund may purchase and sell securities on a when-issued, delayed delivery or forward commitment basis. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls).

Principal Risks

It is possible to lose money on an investment in the Fund. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are listed below.

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 15

PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund

securities, and the risk of unfavorable foreign government actions, including nationalization, expropriation or confiscatory taxation, currency blockage, political changes, diplomatic developments or the imposition of sanctions and other similar measures. Foreign securities may also be less liquid and more difficult to value than securities of U.S. issuers

Leveraging Risk: the risk that certain transactions of the Fund, such as reverse repurchase agreements, loans of portfolio securities, and the use of when-issued, delayed delivery or forward commitment transactions may give rise to leverage, magnifying gains and losses and causing the Fund to be more volatile than if it had not been leveraged. This means that leverage entails a heightened risk of loss

Environmental, Social and Governance Risk: the risk that, because the Fund’s ESG strategy may select or typically exclude securities of certain issuers for reasons in addition to performance, the Fund’s performance may differ from funds that do not utilize an ESG investing strategy. ESG investing is qualitative and subjective by nature, and there is no guarantee that the factors utilized by PIMCO or any judgment exercised by PIMCO will reflect the opinions of any particular investor

Futures Contract Risk: the risk that, while the value of a futures contract tends to correlate with the value of the underlying asset that it represents, differences between the futures market and the market for the underlying asset may result in an imperfect correlation. Futures contracts may involve risks different from, and possibly greater than, the risks associated with investing directly in the underlying assets. The purchase or sale of a futures contract may result in losses in excess of the amount invested in the futures contract

well as the risk of default on the underlying asset. In addition, investments in CLOs carry additional risks including, but not limited to: (i) the possibility that distributions from collateral securities will not be adequate to make interest or other payments; (ii) the quality of the collateral may decline in value or default; (iii) risks related to the capability of the servicer of the securitized assets; (iv) the risk that the Fund may invest in tranches of CLOs that are subordinate to other tranches; (v) the structure and complexity of the transaction and the legal documents may not be fully understood at the time of investment and could lead to disputes with the issuer or among investors regarding the characterization of proceeds or unexpected investment results; and (vi) the CLO's manager may perform poorly

Performance Information

The performance information shows summary performance information for the Fund in a bar chart and an Average Annual Total Returns table. The information provides some indication of the risks of investing in the Fund by showing changes in its performance from year to year and by showing how the Fund’s average annual returns compare with the returns of certain indexes. Absent any applicable fee waivers and/or expense limitations, performance would have been lower. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.

In addition to the Fund’s performance, the Average Annual Total Returns table includes performance of: (i) a broad-based securities market index (i.e., a regulatory index) and (ii) a supplemental index. It is not possible to invest directly in an unmanaged index. Effective July 24, 2024, the Fund’s regulatory index is the Bloomberg U.S. Aggregate Index. The Fund’s regulatory index is shown in connection with certain regulatory requirements to provide a broad measure of market performance. The Bloomberg U.S. Aggregate Index represents securities that are SEC-registered, taxable, and dollar denominated. The index covers the U.S. investment grade fixed rate bond market, with index components for government and corporate securities, mortgage pass-through securities, and asset-backed securities. These major sectors are subdivided into more specific indices that are calculated and reported on a regular basis. The FTSE 3-Month Treasury Bill Index is a supplemental index of the Fund. The FTSE 3-Month Treasury Bill Index is an unmanaged index representing monthly return equivalents of yield averages of the last 3 month Treasury Bill issues.

16 Prospectus | PIMCO ETF Trust

Prospectus

Calendar Year Total Returns

Best Quarter	June 30, 2020	1.92%
Worst Quarter	March 31, 2022	-0.93%
Year-to-Date	September 30, 2024	4.59%

Average Annual Total Returns (for periods ended 12/31/23)

	1 Year	Since Inception	Inception Date
Return Before Taxes	5.71%	1.89%	12/10/2019
Return After Taxes on Distributions(1)	3.74%	0.90%
Return After Taxes on Distributions and Sales of Fund Shares(1)	3.35%	1.02%
Bloomberg U.S. Aggregate Index (reflects no deductions for fees, expenses or taxes)	5.53%	-0.70%
FTSE 3-Month Treasury Bill Index (reflects no deductions for fees, expenses or taxes)	5.26%	1.82%

Investment Adviser/Portfolio Managers

PIMCO serves as the investment adviser for the Fund. The Fund’s portfolio is jointly and primarily managed by Jerome Schneider, Jelle Brons, CFA, Andrew Wittkop and Nathan Chiaverini. Mr. Schneider is a Managing Director of PIMCO. Messrs. Brons and Wittkop are Executive Vice Presidents of PIMCO. Mr. Chiaverini is a Senior Vice President of PIMCO. Messrs. Schneider, Brons, Wittkop and Chiaverini have managed the Fund since its inception in December 2019.

Other Important Information Regarding Fund Shares

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 17

PIMCO Enhanced Short Maturity Active Exchange-Traded Fund

Investment Objective

The Fund seeks maximum current income, consistent with preservation of capital and daily liquidity.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment):

N/A

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

Management Fees	0.35%
Total Annual Fund Operating Expenses	0.35%

1 Year	3 Years	5 Years	10 Years
$36	$113	$197	$443

Portfolio Turnover

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing under normal circumstances at least 80% of its net assets in a diversified portfolio of Fixed Income Instruments of varying maturities, which may be represented by forwards. “Fixed Income Instruments” include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. The average portfolio duration of this Fund will vary based on PIMCO’s market forecasts and will normally not exceed one year. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer

a security’s duration, the more sensitive it will be to changes in interest rates. The dollar-weighted average portfolio maturity of the Fund is normally not expected to exceed three years.

The Fund may invest, without limitation, in futures contracts, subject to applicable law and any other restrictions described in the Fund’s prospectus or Statement of Additional Information. The Fund may invest, without limitation, in mortgage or asset-backed securities, including to-be-announced transactions. The Fund may purchase and sell securities on a when-issued, delayed delivery or forward commitment basis. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls).

Principal Risks

It is possible to lose money on an investment in the Fund. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are listed below.

Market Trading Risk: the risk that an active secondary trading market for Fund shares does not continue once developed, that the Fund may not continue to meet a listing exchange’s trading or listing requirements, that trading in Fund shares may be halted or become less liquid or that the Fund’s shares trade at prices other than the Fund’s net asset value, and are subject to trading costs, which may be exacerbated if the creation/redemption process becomes less effective, particularly during times of market stress

18 PIMCO ETF Trust | Prospectus

Prospectus

Leveraging Risk: the risk that certain transactions of the Fund, such as reverse repurchase agreements, loans of portfolio securities, and the use of when-issued, delayed delivery or forward commitment transactions may give rise to leverage, magnifying gains and losses and causing the Fund to be more volatile than if it had not been leveraged. This means that leverage entails a heightened risk of loss

Management Risk: the risk that the investment techniques and risk analyses applied by PIMCO will not produce the desired results and that

actual or potential conflicts of interest, legislative, regulatory, or tax restrictions, policies or developments may affect the investment techniques available to PIMCO and the individual portfolio managers in connection with managing the Fund and may cause PIMCO to restrict or prohibit participation in certain investments. There is no guarantee that the investment objective of the Fund will be achieved

Performance Information

The performance information shows summary performance information for the Fund in a bar chart and an Average Annual Total Returns table. The information provides some indication of the risks of investing in the Fund by showing changes in its performance from year to year and by showing how the Fund’s average annual returns compare with the returns of certain indexes. Absent any applicable fee waivers and/or expense limitations, performance would have been lower. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 19

PIMCO Enhanced Short Maturity Active Exchange-Traded Fund

In addition to the Fund’s performance, the Average Annual Total Returns table includes performance of: (i) a broad-based securities market index (i.e., a regulatory index) and (ii) a supplemental index. It is not possible to invest directly in an unmanaged index. Effective July 24, 2024, the Fund’s regulatory index is the Bloomberg U.S. Aggregate Index. The Fund’s regulatory index is shown in connection with certain regulatory requirements to provide a broad measure of market performance. The Bloomberg U.S. Aggregate Index represents securities that are SEC-registered, taxable, and dollar denominated. The index covers the U.S. investment grade fixed rate bond market, with index components for government and corporate securities, mortgage pass-through securities, and asset-backed securities. These major sectors are subdivided into more specific indices that are calculated and reported on a regular basis. The FTSE 3-Month Treasury Bill Index is a supplemental index of the Fund. The FTSE 3-Month Treasury Bill Index is an unmanaged index representing monthly return equivalents of yield averages of the last 3 month Treasury Bill issues.

Calendar Year Total Returns

Best Quarter	June 30, 2020	2.92%
Worst Quarter	March 31, 2020	-1.98%
Year-to-Date	September 30, 2024	4.50%

Average Annual Total Returns (for periods ended 12/31/23)

	1 Year	5 Years	10 Years
Return Before Taxes	6.19%	2.00%	1.67%
Return After Taxes on Distributions(1)	4.08%	1.09%	0.91%
Return After Taxes on Distributions and Sales of Fund Shares(1)	3.63%	1.14%	0.94%
Bloomberg U.S. Aggregate Index (reflects no deductions for fees, expenses or taxes)	5.53%	1.10%	1.81%
FTSE 3-Month Treasury Bill Index (reflects no deductions for fees, expenses or taxes)	5.26%	1.91%	1.26%

accounts. In some cases the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.

Investment Adviser/Portfolio Managers

PIMCO serves as the investment adviser for the Fund. The Fund’s portfolio is jointly and primarily managed by Jerome Schneider, Andrew Wittkop and Nathan Chiaverini. Mr. Schneider is a Managing Director of PIMCO, and he has managed the Fund since its inception in November 2009. Mr. Wittkop is an Executive Vice President of PIMCO, and he has managed the Fund since July 2021. Mr. Chiaverini is a Senior Vice President of PIMCO, and he has managed the Fund since July 2021.

Other Important Information Regarding Fund Shares

20 Prospectus | PIMCO ETF Trust

PIMCO Intermediate Municipal Bond Active Exchange-Traded Fund

Investment Objective

The Fund seeks attractive tax-exempt income, consistent with preservation of capital.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment):

N/A

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

Management Fees	0.35%
Total Annual Fund Operating Expenses	0.35%

1 Year	3 Years	5 Years	10 Years
$36	$113	$197	$443

Portfolio Turnover

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing under normal circumstances at least 80% of its assets in a diversified portfolio of debt securities whose interest is, in the opinion of bond counsel for the issuer at the time of issuance, exempt from federal income tax (“Municipal Bonds”). Municipal Bonds generally are issued by or on behalf of states and local governments and their agencies, authorities and other instrumentalities.

The Fund does not intend to invest in Municipal Bonds whose interest is subject to the federal alternative minimum tax. The Fund may only invest in U.S. dollar-denominated investment grade debt securities, rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or equivalently

rated by Standard & Poor’s Ratings Services (“S&P”) or Fitch Ratings, Inc. (“Fitch”), or, if unrated, determined by Pacific Investment Management Company LLC (“PIMCO”) to be of comparable quality. In the event that ratings services assign different ratings to the same security, PIMCO will use the highest rating as the credit rating for that security. The Fund may invest 25% or more of its total assets in Municipal Bonds that finance similar projects, such as those relating to education, health care, housing, transportation, and utilities, and 25% or more of its total assets in industrial development bonds. The average portfolio duration of this Fund normally varies within (negative) 2 years to positive 4 years of the portfolio duration of the securities comprising the Bloomberg 1-15 Year Municipal Bond Index, as calculated by PIMCO, which, as of September 30, 2024, was 4.81 years. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates. The portfolio manager focuses on bonds with the potential to offer attractive current income, typically looking for bonds that can provide consistently attractive current yields or that are trading at competitive market prices.

The Fund may invest in derivative instruments, such as options, futures contracts or swap agreements. The Fund may purchase and sell securities on a when-issued, delayed delivery or forward commitment basis. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls).

Principal Risks

It is possible to lose money on an investment in the Fund. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are listed below.

PIMCO ETF Trust | Prospectus 21

PIMCO Intermediate Municipal Bond Active Exchange-Traded Fund

securities, securities with greater credit risks or securities with other, less favorable features

Municipal Bond Risk: the risk that by investing in Municipal Bonds the Fund may be affected significantly by the economic, regulatory or political developments affecting the ability of issuers of Municipal Bonds to pay interest or repay principal

Derivatives Risk: the risk of investing in derivative instruments (such as forwards, futures, swaps and structured securities) and other similar investments, including leverage, liquidity, interest rate, market, counterparty (including credit), operational, legal and management risks, and valuation complexity. Changes in the value of a derivative or other similar investment may not correlate perfectly with, and may be more sensitive to market events than, the underlying asset, rate or index, and the Fund could lose more than the initial amount invested. Changes in the value of a derivative or other similar instrument may also create margin delivery or settlement payment obligations for the Fund. The Fund’s use of derivatives or other similar investments may result in losses to the Fund, a reduction in the Fund’s returns and/or increased volatility. Non-centrally-cleared over-the-counter (“OTC”) derivatives or other similar investments are also subject to the risk that a counterparty to the transaction will not fulfill its contractual obligations to the other party, as many of the protections afforded to centrally-cleared derivative transactions might not be available for non-centrally-cleared OTC derivatives or other similar investments. The primary credit risk on derivatives or other similar investments that are exchange-traded or traded through a central clearing counterparty resides with the Fund's clearing broker or the clearinghouse. Changes in

regulation relating to a registered fund’s use of derivatives and related instruments could potentially limit or impact the Fund’s ability to invest in derivatives, limit the Fund’s ability to employ certain strategies that use derivatives or other similar investments and/or adversely affect the value of derivatives or other similar investments and the Fund’s performance

California State-Specific Risk: the risk that by focusing its investments in California Municipal Bonds, the Fund may be affected significantly by economic, regulatory or political developments affecting the ability of California issuers to pay interest or repay principal

New York State-Specific Risk: the risk that by focusing its investments in New York Municipal Bonds, the Fund may be affected significantly by economic, regulatory or political developments affecting the ability of New York issuers to pay interest or repay principal

Municipal Project-Specific Risk: the risk that the Fund may be more sensitive to adverse economic, business or political developments if it invests a substantial portion of its assets in the bonds of specific projects (such as those relating to education, health care, housing, transportation and utilities), industrial development bonds, or in bonds from issuers in a single state

Performance Information

22 Prospectus | PIMCO ETF Trust

Prospectus

expense limitations, performance would have been lower. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.

In addition to the Fund’s performance, the Average Annual Total Returns table includes performance of: (i) a broad-based securities market index (i.e., a regulatory index) and (ii) a supplemental index. It is not possible to invest directly in an unmanaged index. Effective July 24, 2024, the Fund’s regulatory index is the Bloomberg Municipal Bond Index. The Fund’s regulatory index is shown in connection with certain regulatory requirements to provide a broad measure of market performance. The Bloomberg Municipal Bond Index consists of a broad selection of investment-grade general obligation and revenue bonds of maturities ranging from one year to 30 years. It is an unmanaged index representative of the tax-exempt bond market. The index is made up of all investment grade municipal bonds. The Bloomberg 1-15 Year Municipal Bond Index is a supplemental index of the Fund. The Bloomberg 1-15 Year Municipal Bond Index consists of a broad selection of investment grade general obligation and revenue bonds of maturities ranging from one year to 17 years. It is an unmanaged index representative of the tax exempt bond market.

Calendar Year Total Returns

Best Quarter	December 31, 2023	6.61%
Worst Quarter	March 31, 2022	-5.41%
Year-to-Date	September 30, 2024	2.69%

Average Annual Total Returns (for periods ended 12/31/23)

	1 Year	5 Years	10 Years
Return Before Taxes	6.07%	2.28%	2.47%
Return After Taxes on Distributions(1)	5.92%	2.22%	2.35%
Return After Taxes on Distributions and Sales of Fund Shares(1)	4.76%	2.23%	2.32%
Bloomberg Municipal Bond Index (reflects no deductions for fees, expenses or taxes)	6.40%	2.25%	3.03%
Bloomberg 1-15 Year Municipal Bond Index (reflects no deductions for fees, expenses or taxes)	5.26%	2.17%	2.58%

Investment Adviser/Portfolio Managers

PIMCO serves as the investment adviser for the Fund. The Fund’s portfolio is jointly and primarily managed by David Hammer and Kyle Christine. Mr. Hammer is a Managing Director of PIMCO, and he has managed the Fund since June 2016. Mr. Christine is a Senior Vice President of PIMCO, and he has managed the Fund since April 2023.

Other Important Information Regarding Fund Shares

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 23

PIMCO Multisector Bond Active Exchange-Traded Fund

Investment Objective

The Fund seeks to maximize yield and long term capital appreciation consistent with prudent investment management.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment):

N/A

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

Management Fees	0.65%
Other Expenses(1)	0.14%
Acquired Fund Fees and Expenses	0.01%
Total Annual Fund Operating Expenses	0.80%
Fee Waiver and/or Expense Reimbursement(2)(3)(4)	(0.11%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement(5)	0.69%

“Other Expenses” include interest expense of 0.14%. Interest expense is borne by the Fund separately from the management fees paid to Pacific Investment Management Company LLC (“PIMCO”). Excluding interest expense, Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement are 0.55%.

Pacific Investment Management Company LLC (“PIMCO”) has contractually agreed, through October 31, 2025, to waive its management fee, or reimburse the Fund, to the extent that organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustees’ fees exceed 0.0049% of the Fund’s average net assets (the “Expense Limit”). Under the Expense Limitation Agreement, which renews annually for a full year unless terminated by PIMCO upon at least 30 days’ notice prior to the end of the contract term, PIMCO may recoup these waivers and reimbursements in future periods, not exceeding three years, provided that organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustees’ fees, plus recoupment, do not exceed the Expense Limit (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit).

PIMCO has contractually agreed, through October 31, 2025, to reduce its management fee by 0.10% of the average daily net assets of the Fund. In any month in which the investment management agreement is in effect, PIMCO is entitled to reimbursement by the Fund of any portion of the management fee waived as set forth above (the “Fee Waiver Reimbursement Amount”) during the previous thirty-six months from the time of the waiver, provided that such amount paid to PIMCO will not: 1) together with any recoupment of organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustee fees pursuant to the Expense Limitation Agreement, exceed 0.0049% (the “Expense Limit”) (calculated as a percentage of average daily net assets) (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit); 2) exceed the total Fee Waiver Reimbursement Amount; or 3) include any amounts previously reimbursed to PIMCO.

1 Year	3 Years	5 Years	10 Years
$70	$244	$433	$980

Portfolio Turnover

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing, under normal circumstances, at least 80% of its assets in a multi-sector portfolio of Fixed Income Instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements. “Fixed Income Instruments” include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. The Fund will not be managed to a benchmark, meaning the Fund can pursue investment opportunities as it sees fit (consistent with its disclosed investment guidelines) without regard to any benchmark index.

In pursuing the Fund’s investment objective, PIMCO expects to emphasize investment strategies that are more strategic, or long-term in nature, with less emphasis on short-term, tactical trading strategies and security selection. In addition, PIMCO will utilize an approach to seek to identify sectors and securities that are undervalued. The Fund’s investment program may involve a longer investment horizon designed to minimize trading volume and distinct investment strategies as compared with other PIMCO-advised funds with names, investment objectives and policies similar to the Fund. As a result, investments made by the Fund and the results achieved by the Fund at any given time are not expected to be the same as or similar to those made by such other PIMCO-advised funds.

The Fund will generally allocate its assets among several investment sectors, without limitation, which may include: (i) high yield securities (“junk bonds”) and investment grade corporate bonds of issuers

24 PIMCO ETF Trust | Prospectus

Prospectus

located in the United States and non-U.S. countries, including emerging market countries; (ii) fixed income securities issued by U.S. and non-U.S. governments (including emerging market governments), their agencies and instrumentalities; (iii) mortgage-related and other asset backed securities; and (iv) foreign currencies, including those of emerging market countries. However, the Fund is not required to gain exposure to any one investment sector, and the Fund’s exposure to any one investment sector will vary over time. The Fund may invest in instruments of any maturity or duration but the average portfolio duration of this Fund is normally expected to vary from two to eight years based on Pacific Investment Management Company LLC’s (“PIMCO”) market forecasts. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates.

The Fund may invest, without limitation, in high yield securities rated below investment grade by Moody’s Investors Service, Inc. (“Moody’s”), Standard & Poor’s Ratings Services (“S&P”) or Fitch Ratings, Inc. (“Fitch”), or if unrated, as determined by PIMCO. The Fund may invest, without limitation, in securities denominated in foreign currencies and in U.S. dollar-denominated securities of foreign issuers. The Fund may obtain foreign currency exposure (from non-U.S. dollar-denominated securities or currencies) without limitation. In addition, the Fund may invest, without limitation, in fixed income securities and instruments that are economically tied to emerging market countries.

The Fund may invest, without limitation, in derivative instruments, such as options, futures contracts or swap agreements, or in mortgage- or asset-backed securities, subject to applicable law and any other restrictions described in the Fund’s prospectus or Statement of Additional Information. The Fund may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis and may engage in short sales. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls). The Fund may also invest in contingent convertible securities and up to 10% of its total assets in preferred securities.

Principal Risks

It is possible to lose money on an investment in the Fund. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are listed below.

New Fund Risk: the risk that a new fund’s performance may not represent how the fund is expected to or may perform in the long term. In addition, new funds have limited operating histories for investors to evaluate and new funds may not attract sufficient assets to achieve investment and trading efficiencies

liquid or that Fund shares trade at prices other than the Fund’s net asset value, and are subject to trading costs, which may be exacerbated if the creation/redemption process becomes less effective, particularly during times of market stress

Interest Rate Risk: the risk that fixed income securities will decline in value because of an increase in interest rates; a fund with a longer average portfolio duration will be more sensitive to changes in interest rates than a fund with a shorter average portfolio duration

Derivatives Risk: the risk of investing in derivative instruments (such as forwards, futures, swaps and structured securities) and other similar

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 25

PIMCO Multisector Bond Active Exchange-Traded Fund

investments, including leverage, liquidity, interest rate, market, counterparty (including credit), operational, legal and management risks, and valuation complexity. Changes in the value of a derivative or other similar investment may not correlate perfectly with, and may be more sensitive to market events than, the underlying asset, rate or index, and the Fund could lose more than the initial amount invested. Changes in the value of a derivative or other similar instrument may also create margin delivery or settlement payment obligations for the Fund. The Fund’s use of derivatives or other similar investments may result in losses to the Fund, a reduction in the Fund’s returns and/or increased volatility. Non-centrally-cleared over-the-counter (“OTC”) derivatives or other similar investments are also subject to the risk that a counterparty to the transaction will not fulfill its contractual obligations to the other party, as many of the protections afforded to centrally-cleared derivative transactions might not be available for non-centrally-cleared OTC derivatives or other similar investments. The primary credit risk on derivatives or other similar investments that are exchange-traded or traded through a central clearing counterparty resides with the Fund's clearing broker or the clearinghouse. Changes in regulation relating to a registered fund’s use of derivatives and related instruments could potentially limit or impact the Fund’s ability to invest in derivatives, limit the Fund’s ability to employ certain strategies that use derivatives or other similar investments and/or adversely affect the value of derivatives or other similar investments and the Fund’s performance

imposition of sanctions and other similar measures. Foreign securities may also be less liquid and more difficult to value than securities of U.S. issuers

Emerging Markets Risk: the risk of investing in emerging market securities, primarily increased foreign (non-U.S.) investment risk

Contingent Convertible Securities Risk: the risks of investing in contingent convertible securities, including the risk that interest payments will be cancelled by the issuer or a regulatory authority, the risk of ranking junior to other creditors in the event of a liquidation or other bankruptcy- related event as a result of holding subordinated debt, the risk of the Fund’s investment becoming further subordinated as a result of conversion from debt to equity, the risk that principal amount due can be written down to a lesser amount (including potentially zero), and the general risks applicable to fixed income investments, including interest rate risk, credit risk, market risk and liquidity risk, any of which could result in losses to the Fund

26 Prospectus | PIMCO ETF Trust

Prospectus

risk, liquidity risk, market risk and prepayment and extension risk, as well as the risk of default on the underlying asset. In addition, investments in CLOs carry additional risks including, but not limited to: (i) the possibility that distributions from collateral securities will not be adequate to make interest or other payments; (ii) the quality of the collateral may decline in value or default; (iii) risks related to the capability of the servicer of the securitized assets; (iv) the risk that the Fund may invest in tranches of CLOs that are subordinate to other tranches; (v) the structure and complexity of the transaction and the legal documents may not be fully understood at the time of investment and could lead to disputes with the issuer or among investors regarding the characterization of proceeds or unexpected investment results; and (vi) the CLO's manager may perform poorly

Performance Information

Investment Adviser/Portfolio Managers

PIMCO serves as the investment adviser for the Fund. The Fund’s portfolio is jointly and primarily managed by Daniel Ivascyn, Alfred Murata, Sonali Pier, Amit Arora, Mukundan Devarajan and Jason Duko. Messrs. Ivascyn and Murata and Ms. Pier are Managing Directors of PIMCO and Messrs. Arora, Devarajan and Duko are Executive Vice Presidents of PIMCO, and they have managed the Fund since its inception in June 2023.

Other Important Information Regarding Fund Shares

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 27

PIMCO Municipal Income Opportunities Active Exchange-Traded Fund

Investment Objective

The Fund seeks current income exempt from federal income tax and long-term capital appreciation.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment):

N/A

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

Management Fees	0.49%
Total Annual Fund Operating Expenses	0.49%
Fee Waiver and/or Expense Reimbursement(1)(2)	(0.10%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	0.39%

PIMCO has contractually agreed, through October 31, 2025, to reduce its management fee by 0.10% of the average daily net assets of the Fund. This waiver will automatically renew for one-year terms unless PIMCO provides written notice to PIMCO ETF Trust at least 30 days prior to the end of the then current month. In any month in which the investment management agreement is in effect, PIMCO is entitled to reimbursement by the Fund of any portion of the management fee waived as set forth above (the “Fee Waiver Reimbursement Amount”) within thirty-six months of the time of the waiver, provided that such amount paid to PIMCO will not: 1) together with any recoupment of organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustee fees pursuant to the Expense Limitation Agreement, exceed 0.0049% (the “Expense Limit”) (calculated as a percentage of average daily net assets) (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit); 2) exceed the total Fee Waiver Reimbursement Amount; or 3) include any amounts previously reimbursed to PIMCO.

1 Year	3 Years	5 Years	10 Years
$40	$147	$264	$606

Portfolio Turnover

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing under normal circumstances at least 80% of its assets in debt securities whose interest is, in the opinion of bond counsel for the issuer at the time of issuance, exempt from federal income tax (“Municipal Bonds”). Municipal Bonds generally are issued by or on behalf of states and local governments and their agencies, authorities and other instrumentalities.

The Fund may invest up to 30% of its total assets in high yield securities (those that are rated, at the time of purchase, below investment grade by Moody’s Investors Service, Inc. (“Moody’s”), or equivalently rated by Standard & Poor’s Ratings Services (“S&P”) or Fitch Ratings, Inc. (“Fitch”), or, if unrated, determined by PIMCO to be of comparable quality (commonly known as “junk bonds”)). In the event that ratings services assign different ratings to the same security, PIMCO will use the highest rating as the credit rating for that security. The Fund may also invest, without limitation, in higher rated securities. The Fund may invest without limitation in “private activity” bonds whose interest is a tax-preference item for purposes of the federal alternative minimum tax (“AMT”). For shareholders subject to the AMT, distributions derived from “private activity” bonds must be included in their AMT calculations, and as such a portion of the Fund’s distribution may be subject to federal income tax. The average portfolio duration of this Fund normally varies within (negative) 2 years to positive 2 years of the portfolio duration of the securities comprising the Bloomberg Municipal Bond Index, as calculated by PIMCO, which, as of September 30, 2024, was 6.30 years. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates. PIMCO’s management of the Fund generally seeks to focus on bonds with the potential to offer attractive current income, typically looking for bonds that can provide consistently attractive current yields or that are trading at competitive market prices.

The Fund may invest significantly in Municipal Bonds of specific projects, including those that finance education, health care, housing, transportation, utilities and other similar projects, and industrial development bonds. The Fund may invest significantly in issuers of particular jurisdictions, such as California and New York.

28 PIMCO ETF Trust | Prospectus

Prospectus

The Fund may invest in other types of Fixed Income Instruments. “Fixed Income Instruments” include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. The Fund may also invest in derivative instruments, such as options, futures contracts or swap agreements. The Fund may purchase and sell securities on a when-issued, delayed delivery or forward commitment basis. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls).

Principal Risks

It is possible to lose money on an investment in the Fund. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are listed below.

Derivatives Risk: the risk of investing in derivative instruments (such as forwards, futures, swaps and structured securities ) and other similar investments, including leverage, liquidity, interest rate, market, counterparty (including credit), operational, legal and management risks, and valuation complexity. Changes in the value of a derivative or other similar investment may not correlate perfectly with, and may be more sensitive to market events than, the underlying asset, rate or index, and the Fund could lose more than the initial amount invested. Changes in the value of a derivative or other similar instrument may also create margin delivery or settlement payment obligations for the Fund. The Fund’s use of derivatives or other similar investments may result in losses to the Fund, a reduction in the Fund’s returns and/or increased volatility. Non-centrally-cleared over-the-counter (“OTC”) derivatives or other similar investments are also subject to the risk that a counterparty to the transaction will not fulfill its contractual obligations to the other party, as many of the protections afforded to centrally-cleared derivative transactions might not be available for non-centrally-cleared OTC derivatives or other similar investments. The primary credit risk on derivatives or other similar investments that are exchange-traded or traded through a central clearing counterparty resides with the Fund's clearing broker or the clearinghouse. Changes in regulation relating to a registered fund’s use of derivatives and related instruments could potentially limit or impact the Fund’s ability to invest in derivatives, limit the Fund’s ability to employ certain strategies that use derivatives or other similar investments and/or adversely affect the value of derivatives or other similar investments and the Fund’s performance

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 29

PIMCO Municipal Income Opportunities Active Exchange-Traded Fund

restrictions, policies or developments may affect the investment techniques available to PIMCO and the individual portfolio managers in connection with managing the Fund and may cause PIMCO to restrict or prohibit participation in certain investments. There is no guarantee that the investment objective of the Fund will be achieved

California State-Specific Risk: the risk that by concentrating its investments in California Municipal Bonds, the Fund may be affected significantly by economic, regulatory or political developments affecting the ability of California issuers to pay interest or repay principal

New York State-Specific Risk: the risk that by concentrating its investments in New York Municipal Bonds, the Fund may be affected significantly by economic, regulatory or political developments affecting the ability of New York issuers to pay interest or repay principal

Puerto Rico-Specific Risk: the risk that by investing in Municipal Bonds issued by Puerto Rico or its instrumentalities, the Fund may be affected by certain developments, such as political, economic, environmental, social, regulatory or debt restructuring developments, that impact the ability or obligation of Puerto Rico municipal issuers to pay interest or repay principal

AMT Bonds Risk: the risk that “AMT Bonds,” which are municipal securities that pay interest that is taxable under the federal alternative minimum tax applicable to noncorporate taxpayers, may expose the Fund to certain risks in addition to those typically associated with municipal bonds. Interest or principal on AMT Bonds paid out of current or anticipated revenues from a specific project or specific asset may be adversely impacted by declines in revenue from the project or asset. Declines in general business activity could also affect the economic viability of facilities that are the sole source of revenue to support AMT Bonds. In this regard, AMT Bonds may entail greater risks than general obligation municipal bonds. For shareholders subject to the federal alternative minimum tax, a portion of the Fund’s distributions may not be exempt from gross federal income, which may give rise to alternative minimum tax liability

Performance Information

In addition to the Fund’s performance, the Average Annual Total Returns table includes performance of a broad-based securities market index (i.e., a regulatory index). It is not possible to invest directly in an unmanaged index. Effective July 24, 2024, the Fund’s regulatory index is the Bloomberg Municipal Bond Index. The Fund’s regulatory index is shown in connection with certain regulatory requirements to provide a broad measure of market performance. The Bloomberg Municipal Bond Index consists of a broad selection of investment-grade general obligation and revenue bonds of maturities ranging from one year to 30 years. It is an unmanaged index representative of the tax-exempt bond market. The index is made up of all investment grade municipal bonds.

Calendar Year Total Returns

Best Quarter	December 31, 2023	7.60%
Worst Quarter	March 31, 2022	-7.07%
Year-to-Date	September 30, 2024	3.99%

30 Prospectus | PIMCO ETF Trust

Prospectus

Average Annual Total Returns (for periods ended 12/31/23)

	1 Year	Since Inception	Inception Date
Return Before Taxes	8.57%	-1.07%	9/8/2021
Return After Taxes on Distributions(1)	8.29%	-1.24%
Return After Taxes on Distributions and Sales of Fund Shares(1)	6.43%	-0.31%
Bloomberg Municipal Bond Index (reflects no deductions for fees, expenses or taxes)	6.40%	-1.15%

After-tax returns are calculated using the highest historical 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, and 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.In some cases the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.

Investment Adviser/Portfolio Managers

PIMCO serves as the investment adviser for the Fund. The Fund’s portfolio is jointly and primarily managed by David Hammer and Kyle Christine. Mr. Hammer is a Managing Director of PIMCO, and he has managed the Fund since its inception. Mr. Christine is a Senior Vice President of PIMCO, and he has managed the Fund since its inception.

Other Important Information Regarding Fund Shares

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 31

PIMCO Preferred and Capital Securities Active Exchange-Traded Fund

Investment Objective

The Fund seeks total return, consistent with prudent investment management, with a secondary objective of income generation.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment):

N/A

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

Management Fees	0.84%
Other Expenses(1)	0.05%
Total Annual Fund Operating Expenses	0.89%
Fee Waiver and/or Expense Reimbursement(2)(3)	(0.15%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	0.74%

“Other Expenses” include interest expense of 0.05%. Interest expense is borne by the Fund separately from the management fees paid to Pacific Investment Management Company LLC (“PIMCO”). Excluding interest expense, Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement are 0.69%.

PIMCO has contractually agreed, through October 31, 2025, to reduce its management fee by 0.15% of the average daily net assets of the Fund. This waiver will automatically renew for one-year terms unless PIMCO provides written notice to PIMCO ETF Trust at least 30 days prior to the end of the then current term. In any month in which the investment management agreement is in effect, PIMCO is entitled to reimbursement by the Fund of any portion of the management fee waived as set forth above (the “Fee Waiver Reimbursement Amount”) during the previous thirty-six months from the time of the waiver, provided that such amount paid to PIMCO will not: 1) together with any recoupment of organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustee fees pursuant to the Expense Limitation Agreement, exceed the Expense Limit (calculated as a percentage of average daily net assets) (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit); 2) exceed the total Fee Waiver Reimbursement Amount; or 3) include any amounts previously reimbursed to PIMCO.

your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 Year	3 Years	5 Years	10 Years
$76	$269	$478	$1,082

Portfolio Turnover

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing, under normal circumstances, at least 80% of its assets in a diversified portfolio of preferred securities and “Capital Securities.” “Capital Securities” include (1) securities issued by U.S. and non-U.S. financial institutions (including, but not limited to, banks and insurance companies) that can be used to satisfy their regulatory capital requirements and (2) securities, which may include instruments referred to as hybrid securities, that would be subordinated (i.e., fall lower in the capital structure) to at least one type of debt. Hybrid securities may be issued to fulfill ratings criteria for debt securities of an issuer and may, for example, be convertible into preferred shares. Preferred securities and “Capital Securities” may be represented by forwards or derivatives such as options, futures contracts or swap agreements. The “total return” sought by the Fund consists of income earned on the Fund’s investments, plus capital appreciation, if any, which generally arises from decreases in interest rates, foreign currency appreciation or improving credit fundamentals for a particular market sector or security.

Assets not invested in preferred securities or Capital Securities may be invested in other types of Fixed Income Instruments, including derivative Fixed Income Instruments. “Fixed Income Instruments” include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. In addition, the Fund will concentrate its investments in a group of industries related to banks. With respect to investments in equity securities, there is no limitation on the market capitalization range of the issuers in which the Fund may invest.

The Fund may invest up to 50% of its total assets in high yield securities (“junk bonds”) rated below Baa by Moody’s Investors Service, Inc. (“Moody’s”), or equivalently rated by Standard & Poor’s Ratings Services (“S&P”) or Fitch Ratings, Inc. (“Fitch”), or if, unrated, determined by PIMCO to be of comparable quality. In the event that ratings services assign different ratings to the same security, PIMCO will use the highest rating as the credit rating for that security. The Fund may also invest without limit in securities denominated in foreign currencies and in

32 PIMCO ETF Trust | Prospectus

Prospectus

U.S. dollar-denominated securities of foreign issuers. The Fund may invest without limit in securities and instruments that are economically tied to emerging market countries. The Fund may also invest in contingent convertible securities.

The Fund may invest in derivative instruments, such as options, futures contracts or swap agreements, subject to applicable law and any other restrictions described in the Fund’s prospectus or Statement of Additional Information. The Fund may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis, including currency forwards, and may engage in short sales.

The average portfolio duration of the Fund will normally vary within one year (plus or minus) of the portfolio duration of the securities comprising the ICE BofA US All Capital Securities Index, which as of September 30, 2024 was 5.02 years. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates.

In pursuing the Fund’s investment objective, PIMCO may emphasize investment strategies that are more strategic, or long-term in nature, with less emphasis on short-term, tactical trading strategies. In addition, PIMCO will utilize a bottom up approach to seek to identify sectors and securities that are undervalued, and the Fund’s investment program may involve a longer investment horizon designed to minimize trading volume and distinct investment strategies as compared with other PIMCO-advised funds with names, investment objectives and policies similar to the Fund. As a result, investments made by the Fund and the results achieved by the Fund at any given time are not expected to be the same as or similar to those made by such other PIMCO-advised funds.

Principal Risks

It is possible to lose money on an investment in the Fund. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are listed below.

Capital Securities Risk: the risk that the value of securities, which may be in the form of debt, equity or a hybrid thereof, issued by U.S. and non-U.S. financial institutions that can be used to satisfy their regulatory capital requirements may decline in response to changes in legislation and regulations applicable to financial institutions and financial markets, increased competition, adverse changes in general or industry-specific economic conditions, or unfavorable interest rates. By investing under normal circumstances at least 80% of its assets in a combination of preferred securities and Capital Securities, the Fund will be more susceptible to these risks than a fund that does not invest in Capital Securities to the same extent as the Fund.

Preferred Securities Risk: the risk that preferred securities may be subject to greater credit or other risks than senior debt instruments. In addition, preferred securities are subject to other risks, such as risks related to deferred and omitted distributions, limited voting rights, liquidity, interest rate, regulatory changes and special redemption rights

Concentration in Banking Industries Risk: the risk of concentrating in industries related to banking, including interest rate risk, market risk, the risk of heightened competition and the risk that legislation and other government actions could adversely affect such industries

Contingent Convertible Securities Risk: the risks of investing in contingent convertible securities, including the risk that interest payments will be cancelled by the issuer or a regulatory authority, the risk of ranking junior to other creditors in the event of a liquidation or other bankruptcy-related event as a result of holding subordinated debt, the risk of the Fund’s investment becoming further subordinated as a result of conversion from debt to equity, the risk that principal amount due can be written down to a lesser amount (including potentially to zero), and the general risks applicable to fixed income investments, including interest rate risk, credit risk, market risk and liquidity risk, any of which could result in losses to the Fund

High Yield Risk: the risk that high yield securities and unrated securities of similar credit quality (commonly known as “junk bonds”)

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 33

PIMCO Preferred and Capital Securities Active Exchange-Traded Fund

are subject to greater levels of credit, call and liquidity risks. High yield securities are considered primarily speculative with respect to the issuer’s continuing ability to make principal and interest payments, and may be more volatile than higher-rated securities of similar maturity

Derivatives Risk: the risk of investing in derivative instruments (such as forwards, futures, swaps and structured securities) and other similar investments, including leverage, liquidity, interest rate, market, counterparty (including credit), operational, legal and management risks, and valuation complexity. Changes in the value of a derivative or other similar investment may not correlate perfectly with, and may be more sensitive to market events than, the underlying asset, rate or index, and the Fund could lose more than the initial amount invested. Changes in the value of a derivative or other similar instrument may also create margin delivery or settlement payment obligations for the Fund. The Fund’s use of derivatives or other similar investments may result in losses to the Fund, a reduction in the Fund’s returns and/or increased volatility. Non-centrally-cleared over-the-counter (“OTC”) derivatives or other similar investments are also subject to the risk that a counterparty to the transaction will not fulfill its contractual obligations to the other party, as many of the protections afforded to centrally-cleared derivative transactions might not be available for non-centrally-cleared OTC derivatives or other similar investments. The primary credit risk on derivatives or other similar investments that are exchange-traded or traded through a central clearing counterparty resides with the Fund's clearing broker or the clearinghouse. Changes in regulation relating to a registered fund’s use of derivatives and related instruments could potentially limit or impact the Fund’s ability to invest in derivatives, limit the Fund’s ability to employ certain strategies that use derivatives or other similar investments and/or adversely affect the value of derivatives or other similar investments and the Fund’s performance

in securities of U.S. companies, due to smaller markets, differing reporting, accounting and auditing standards, increased risk of delayed settlement of portfolio transactions or loss of certificates of portfolio securities, and the risk of unfavorable foreign government actions, including nationalization, expropriation or confiscatory taxation, currency blockage, political changes, diplomatic developments or the imposition of sanctions and other similar measures. Foreign securities may also be less liquid and more difficult to value than securities of U.S. issuers

Emerging Markets Risk: the risk of investing in emerging market securities, primarily increased foreign (non-U.S.) investment risk

LIBOR Transition Risk: the risk related to the discontinuation of the London Interbank Offered Rate (“LIBOR”). Certain instruments held by the Fund may reference LIBOR. Due to benchmark reforms, publication of all LIBOR settings has ceased. Although LIBOR is no longer published, there are potential effects related to the transition away from LIBOR or

34 Prospectus | PIMCO ETF Trust

Prospectus

the prior use of LIBOR on the Fund, or on certain instruments in which the Fund invests, which can be difficult to ascertain and could result in losses to the Fund

Performance Information

Investment Adviser/Portfolio Managers

PIMCO serves as the investment adviser for the Fund. The Fund’s portfolio is jointly and primarily managed by Philippe Bodereau, Amit Arora, Matthieu Loriferne and Tanuj Dora. Mr. Bodereau is a Managing Director of PIMCO, Messrs. Arora and Loriferne are each Executive Vice Presidents of PIMCO and Mr. Dora is a Senior Vice President of PIMCO. Messrs. Bodereau, Arora, Loriferne and Dora have managed the Fund since its inception in January 2023.

Other Important Information Regarding Fund Shares

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 35

PIMCO Prime Limited Maturity Active Exchange-Traded Fund

Investment Objective

The Fund seeks maximum current income, consistent with preservation of capital and daily liquidity.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment):

N/A

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

Management Fees	0.25%
Other Expenses(1)	0.20%
Total Annual Fund Operating Expenses	0.45%
Fee Waiver and/or Expense Reimbursement(2)	(0.20%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	0.25%

“Other Expenses” reflect estimated organizational expenses for the Fund’s first fiscal year.

Pacific Investment Management Company LLC (“PIMCO”) has contractually agreed, through October 31, 2025, to waive a portion of the Fund’s management fees, or reimburse the Fund, to the extent that the Fund’s organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata share of Trustee fees exceed 0.0049% (the “Expense Limit”) (calculated as a percentage of average daily net assets). This Expense Limitation Agreement will automatically renew for one-year terms unless PIMCO provides written notice to PIMCO ETF Trust at least 30 days prior to the end of the then current term. In any month in which the investment management agreement is in effect, PIMCO is entitled to reimbursement by the Fund of any portion of the management fee waived or reimbursed as set forth above (the “Reimbursement Amount”) within thirty-six months of the time of the waiver, provided that such amount paid to PIMCO will not: 1) together with any organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustee fees, exceed, for such month, the Expense Limit (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit); 2) exceed the total Reimbursement Amount; or 3) include any amounts previously reimbursed to PIMCO.

1 Year	3 Years
$26	$124

Portfolio Turnover

The Fund pays transaction costs when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example tables, affect the Fund’s performance. The Fund had not yet commenced operations as of the most recent fiscal year end. Thus, no portfolio turnover rate is provided for the Fund.

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing under normal circumstances at least 65% of its total assets in a diversified portfolio of fixed income securities of varying maturities. The Fund may only invest in U.S. dollar denominated securities that mature within 18 months from the date of purchase or floating rate U.S. government agency securities that mature within two years from the date of purchase. The average portfolio duration of this Fund will vary based on PIMCO’s market forecasts and will normally not exceed 90 days. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates.

The Fund primarily invests in U.S. dollar-denominated investment grade debt securities, rated A or higher by Moody’s Investors Service, Inc. (“Moody’s”), or equivalently rated by Standard & Poor’s Ratings Services (“S&P”) or Fitch Ratings, Inc. (“Fitch”), or, if unrated, determined by PIMCO to be of comparable quality. In the event that ratings services assign different ratings to the same security, PIMCO will use the highest rating as the credit rating for that security.

The Fund may purchase and sell securities on a when-issued, delayed delivery or forward commitment basis. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls).

Principal Risks

It is possible to lose money on an investment in the Fund. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are listed below.

Small Fund Risk: the risk that a smaller fund may not achieve investment or trading efficiencies. Additionally, a smaller fund may be more adversely affected by large purchases or redemptions of fund shares

Market Trading Risk: the risk that an active secondary trading market for Fund shares does not continue once developed, that the Fund may

36 PIMCO ETF Trust | Prospectus

Prospectus

not continue to meet a listing exchange’s trading or listing requirements, that trading in Fund shares may be halted or become less liquid or that Fund shares trade at prices other than the Fund’s net asset value, and are subject to trading costs, which may be exacerbated if the creation/redemption process becomes less effective, particularly during times of market stress

Leveraging Risk: the risk that certain transactions of the Fund, such as reverse repurchase agreements, loans of portfolio securities, and the use of when-issued, delayed delivery or forward commitment transactions may give rise to leverage, magnifying gains and losses and causing the Fund to be more volatile than if it had not been leveraged. This means that leverage entails a heightened risk of loss

Performance Information

Investment Adviser/Portfolio Manager

PIMCO serves as the investment adviser for the Fund. The Fund’s portfolio is managed by Jerome Schneider. Mr. Schneider is a Managing Director of PIMCO and he will manage the Fund as of its inception.

Other Important Information Regarding Fund Shares

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 37

PIMCO Senior Loan Active Exchange-Traded Fund

Investment Objective

The Fund seeks current income, consistent with prudent investment management.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment):

N/A

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

Management Fees	0.70%
Other Expenses(1)	0.04%
Total Annual Fund Operating Expenses	0.74%
Fee Waiver and/or Expense Reimbursement(2)(3)	(0.11%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	0.63%

“Other Expenses” include interest expense of 0.03%. Interest expense is borne by the Fund separately from the management fees paid to Pacific Investment Management Company LLC (“PIMCO”). Excluding interest expense, Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement are 0.60%.

PIMCO has contractually agreed, through October 31, 2025, to reduce its management fee by 0.10% of the average daily net assets of the Fund. In any month in which the investment management agreement is in effect, PIMCO is entitled to reimbursement by the Fund of any portion of the management fee waived as set forth above (the “Fee Waiver Reimbursement Amount”) within thirty-six months of the time of the waiver, provided that such amount paid to PIMCO will not: 1) together with any recoupment of organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustee fees pursuant to the Expense Limitation Agreement, exceed 0.0049% (the “Expense Limit”) (calculated as a percentage of average daily net assets) (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit); 2) exceed the total Fee Waiver Reimbursement Amount; or 3) include any amounts previously reimbursed to PIMCO.

operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 Year	3 Years	5 Years	10 Years
$64	$225	$401	$908

Portfolio Turnover

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing, under normal circumstances, at least 80% of its assets in a diversified portfolio of Senior Loans, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements. “Senior Loans” include senior secured floating rate bank loans, also referred to as leveraged loans, bank loans and floating rate loans, that are first or second lien loans. The Fund may also invest in collateralized loan obligations and high-yield corporate debt securities, which may also be represented by forwards or derivatives such as options, futures contracts or swap agreements.

A Senior Loan holds a senior position in the issuer’s capital structure and is typically secured by collateral such that, under normal circumstances, holders (such as the Fund) enjoy a priority claim to some or all of the issuer’s assets in the event of default as compared to other creditors of the issuer. Floating rate bank loans generally pay interest at rates that adjust whenever a specified interest rate changes and/or reset on predetermined dates (such as the last day of a month or calendar quarter).

The Fund may invest, without limitation, in high yield securities (“junk bonds”) rated below investment grade by Moody’s Investors Services, Inc. (“Moody’s”), or equivalently rated by Standard & Poor’s Rating Services (“S&P”) or Fitch Ratings, Inc. (“Fitch”), or if, unrated, determined by PIMCO to be of comparable quality. In the event that ratings services assign different ratings to the same security, PIMCO will use the highest rating as the credit rating for that security. The Fund may also invest up to 20% of its total assets in securities denominated in foreign currencies. The Fund may invest without limit in U.S. dollar-denominated securities of foreign issuers. The Fund will normally limit its foreign currency exposure (from non-U.S. dollar-denominated securities or currencies) to 20% of its total assets.

The Fund may invest in derivative instruments, such as credit default swap and total return swap agreements, interest rate swaps, futures and options, subject to applicable law and any other restrictions described in the prospectus or Statement of Additional Information. The Fund may purchase or sell securities on a when-issued, delayed delivery or forward

38 PIMCO ETF Trust | Prospectus

Prospectus

commitment basis, including currency forwards, and may engage in short sales. The Fund may invest up to 20% of its total assets in preferred stock.

The average portfolio duration of the Fund will normally vary within one year (plus or minus) of the portfolio duration of the securities comprising the Markit iBoxx USD Liquid Leveraged Loan Index, as calculated by PIMCO, which as of September 30, 2024 was 0.00 years. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates.

Principal Risks

It is possible to lose money on an investment in the Fund. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are listed below.

Senior Loan Risk: the risk that investing in senior loans, including bank loans, exposes the Fund to heightened credit risk, call risk, settlement risk and liquidity risk. If an issuer of a senior loan prepays or redeems the loan prior to maturity, the Fund may have to reinvest the proceeds in instruments that pay lower interest rates. To the extent the Fund invests in senior loans that are covenant-lite obligations, the Fund may have fewer rights against a borrower (e.g., covenant-lite obligations may contain fewer maintenance covenants than other obligations, or no maintenance covenants) and may have a greater risk of loss on such investments as compared to investments in traditional loans

Credit Risk: the risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to a derivative

contract, or the issuer or guarantor of collateral, is unable or unwilling, or is perceived (whether by market participants, rating agencies, pricing services or otherwise) as unable or unwilling, to meet its financial obligations

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 39

PIMCO Senior Loan Active Exchange-Traded Fund

index, and the Fund could lose more than the initial amount invested. Changes in the value of a derivative or other similar instrument may also create margin delivery or settlement payment obligations for the Fund. The Fund’s use of derivatives or other similar investments may result in losses to the Fund, a reduction in the Fund’s returns and/or increased volatility. Non-centrally-cleared over-the-counter (“OTC”) derivatives or other similar investments are also subject to the risk that a counterparty to the transaction will not fulfill its contractual obligations to the other party, as many of the protections afforded to centrally-cleared derivative transactions might not be available for non-centrally-cleared OTC derivatives or other similar investments. The primary credit risk on derivatives or other similar investments that are exchange-traded or traded through a central clearing counterparty resides with the Fund's clearing broker or the clearinghouse. Changes in regulation relating to a registered fund’s use of derivatives and related instruments could potentially limit or impact the Fund’s ability to invest in derivatives, limit the Fund’s ability to employ certain strategies that use derivatives or other similar investments and/or adversely affect the value of derivatives or other similar investments and the Fund’s performance

Asset-Backed Securities Risk: the risks of investing in asset-backed securities, including interest rate risk, extension risk, prepayment risk and credit risk

Performance Information

40 Prospectus | PIMCO ETF Trust

Prospectus

supplemental index of the Fund. The iBoxx USD Liquid Leveraged Loans Index comprises approximately 100 of the most liquid, tradable USD leveraged loans. Index constituents are derived using selection criteria such as loan type, minimum size, liquidity, credit ratings, initial spreads and minimum time to maturity.Performance for the Fund is updated daily and quarterly and may be obtained as follows: daily and quarterly updates on the net asset value and performance page at https://www.pimco.com/en-us/investments/etf.

Calendar Year Total Returns

Best Quarter	December 31, 2023	3.40%
Worst Quarter	June 30, 2023	2.98%
Year-to-Date	September 30, 2024	6.28%

Average Annual Total Returns (for periods ended 12/31/23)

	1 Year	Since Inception	Inception Date
Return Before Taxes	12.96%	8.67%	6/8/2022
Return After Taxes on Distributions	9.16%	5.41%
Return After Taxes on Distributions and Sales of Fund Shares	7.55%	5.18%
Bloomberg U.S. Aggregate Index (reflects no deductions for fees, expenses or taxes)	5.53%	1.17%
iBoxx USD Liquid Leveraged Loans Index (reflects no deductions for fees, expenses or taxes)	11.82%	8.11%

Investment Adviser/Portfolio Managers

PIMCO serves as the investment adviser for the Fund. The Fund’s portfolio is jointly and primarily managed by David Forgash, Giang Bui, Jason Duko and Tanuj Dora. Mr. Forgash is a Managing Director of PIMCO, Ms. Bui and Mr. Duko are Executive Vice Presidents of PIMCO and Mr. Dora is a Senior Vice President of PIMCO. Messrs. Forgash and Dora and Ms. Bui have managed the Fund since its inception in June 2022 and Mr. Duko has managed the Fund since May 2023.

Other Important Information Regarding Fund Shares

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 41

PIMCO Short Term Municipal Bond Active Exchange-Traded Fund

Investment Objective

The Fund seeks attractive tax-exempt income, consistent with preservation of capital.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment):

N/A

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

Management Fees	0.35%
Total Annual Fund Operating Expenses	0.35%

1 Year	3 Years	5 Years	10 Years
$36	$113	$197	$443

Portfolio Turnover

Principal Investment Strategies

rated by Standard & Poor’s Ratings Services (“S&P”) or Fitch Ratings, Inc. (“Fitch”), or, if unrated, determined by Pacific Investment Management Company LLC (“PIMCO”) to be of comparable quality. In the event that ratings services assign different ratings to the same security, PIMCO will use the highest rating as the credit rating for that security. The Fund may invest 25% or more of its total assets in Municipal Bonds that finance similar projects, such as those relating to education, health care, housing, transportation, and utilities, and 25% or more of its total assets in industrial development bonds. The average portfolio duration of this Fund varies based on PIMCO’s market forecasts and under normal market conditions is not expected to exceed three years. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates. The dollar- weighted average portfolio maturity of the Fund is normally not expected to exceed three years. The portfolio manager focuses on bonds with the potential to offer attractive current income, typically looking for bonds that can provide consistently attractive current yields or that are trading at competitive market prices.

Principal Risks

It is possible to lose money on an investment in the Fund. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are listed below.

42 PIMCO ETF Trust | Prospectus

Prospectus

securities, securities with greater credit risks or securities with other, less favorable features

Derivatives Risk: the risk of investing in derivative instruments (such as forwards, futures, swaps and structured securities) and other similar investments, including leverage, liquidity, interest rate, market, counterparty (including credit), operational, legal and management risks, and valuation complexity. Changes in the value of a derivative or other similar investment may not correlate perfectly with, and may be more sensitive to market events than, the underlying asset, rate or index, and the Fund could lose more than the initial amount invested. Changes in the value of a derivative or other similar instrument may also create margin delivery or settlement payment obligations for the Fund. The Fund’s use of derivatives or other similar investments may result in losses to the Fund, a reduction in the Fund’s returns and/or increased volatility. Non-centrally-cleared over-the-counter (“OTC”) derivatives or other similar investments are also subject to the risk that a counterparty to the transaction will not fulfill its contractual obligations to the other party, as many of the protections afforded to centrally-cleared derivative transactions might not be available for non-centrally-cleared OTC derivatives or other similar investments. The primary credit risk on derivatives or other similar investments that are exchange-traded or traded through a central clearing counterparty resides with the Fund's clearing broker or the clearinghouse. Changes in

Performance Information

The performance information shows summary performance information for the Fund in a bar chart and an Average Annual Total Returns table. The information provides some indication of the risks of investing in the Fund by showing changes in its performance from year to year and by showing how the Fund’s average annual returns compare with the returns of certain indexes. Absent any applicable fee waivers and/or expense limitations, performance would have been lower. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 43

PIMCO Short Term Municipal Bond Active Exchange-Traded Fund

market-value-weighted index engineered for the long term tax-exempt bond market. To be included in the Index, bonds must be rated investment-grade (Baa3/ BBB- or higher) by at least two of the following ratings agencies: Moody’s, S&P and Fitch. If only two of the three agencies rate the security, the lower rating is used to determine index eligibility. If only one of the three agencies rates a security, the rating must be investment-grade. They must have an outstanding par value of at least $7 million and be issued as part of a transaction of at least $75 million. The bonds must be fixed rate, have a dated-date after December 31, 1990, and must be at least one year from their maturity date. Remarketed issues, taxable municipal bonds, bonds with floating rates, and derivatives, are excluded from the benchmark. The Bloomberg 1-Year Municipal Bond Index is a supplemental index of the Fund. The Bloomberg 1-Year Municipal Bond Index is the 1 Year (1-2) component of the Bloomberg Municipal Bond Index. It is not possible to invest directly in an index.

Calendar Year Total Returns

Best Quarter	December 31, 2023	3.18%
Worst Quarter	March 31, 2022	-2.42%
Year-to-Date	September 30, 2024	2.78%

Average Annual Total Returns (for periods ended 12/31/23)

	1 Year	5 Years	10 Years
Return Before Taxes	4.44%	1.68%	1.32%
Return After Taxes on Distributions(1)	4.25%	1.62%	1.25%
Return After Taxes on Distributions and Sales of Fund Shares(1)	3.61%	1.59%	1.26%
Bloomberg Municipal Bond Index (reflects no deductions for fees, expenses or taxes)	6.40%	2.25%	3.03%
Bloomberg 1-Year Municipal Bond Index (reflects no deductions for fees, expenses or taxes)	3.39%	1.34%	1.09%

to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.

Investment Adviser/Portfolio Managers

PIMCO serves as the investment adviser for the Fund. The Fund’s portfolio is jointly and primarily managed by David Hammer and Kyle Christine. Mr. Hammer is a Managing Director of PIMCO, and he has managed the Fund since August 2015. Mr. Christine is a Senior Vice President of PIMCO, and he has managed the Fund since April 2023.

Other Important Information Regarding Fund Shares

44 Prospectus | PIMCO ETF Trust

PIMCO Ultra Short Government Active Exchange-Traded Fund

Investment Objective

The Fund seeks maximum current income, consistent with preservation of capital and daily liquidity.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment):

N/A

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

Management Fees	0.14%
Other Expenses	0.01%
Total Annual Fund Operating Expenses	0.15%
Fee Waiver and/or Expense Reimbursement(1)	(0.01%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	0.14%

1 Year	3 Years	5 Years	10 Years
$14	$47	$84	$191

Portfolio Turnover

Principal Investment Strategies

The Fund invests 100% of its total assets in (i) cash, (ii) U.S. government securities, such as U.S. Treasury bills, notes, and other obligations issued by, or guaranteed as to principal and interest by, the U.S. government (including its agencies and instrumentalities), and (iii) repurchase agreements that are collateralized fully by such U.S. government securities or cash. The Fund seeks to achieve its investment objective by investing under normal circumstances at least 80% of its assets in U.S. government securities.

The dollar-weighted average portfolio maturity of this Fund may not exceed 120 days. The Fund may only invest in securities that mature in 6 months or less. The Fund is not a money market fund and does not seek to maintain a stable net asset value of $1.00 per share.

Principal Risks

It is possible to lose money on an investment in the Fund. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are listed below.

PIMCO ETF Trust | Prospectus 45

PIMCO Ultra Short Government Active Exchange-Traded Fund

or is perceived (whether by market participants, rating agencies, pricing services or otherwise) as unable or unwilling, to meet its financial obligations

Performance Information

Investment Adviser/Portfolio Managers

PIMCO serves as the investment adviser for the Fund. The Fund’s portfolio is managed by Jerome Schneider, Andrew Wittkop, William Martinez and Geoffrey Miles. Mr. Schneider is a Managing Director of PIMCO, Messrs. Wittkop and Martinez are Executive Vice Presidents of PIMCO and Mr. Miles is a Vice President of PIMCO. Messrs. Schneider, Wittkop, Martinez and Miles have managed the Fund since its inception in June 2023.

Other Important Information Regarding Fund Shares

46 Prospectus | PIMCO ETF Trust

Summary of Other Important Information Regarding Fund Shares

Purchase and Sale of Fund Shares

Each Fund is an exchange-traded fund (“ETF”). Individual Fund shares may only be purchased and sold on a national securities exchange through a broker-dealer and may not be purchased or redeemed directly with a Fund.

The price of Fund shares is based on market price, and because ETF shares trade at market prices rather than net asset value (“NAV”), shares may trade at a price greater than NAV (a premium) or less than NAV (a discount). An investor may incur costs attributable to the difference between the highest price a buyer is willing to pay to purchase shares of a Fund (“bid”) and the lowest price a seller is willing to accept for shares (“ask”) when buying or selling shares in the secondary market (the “bid-ask spread”). Recent information, including information about each Fund’s NAV, market price, premiums and discounts, and bid-ask spreads, is included on the Fund’s website at https://www.pimco.com/en-us/investments/etf.

Tax Information

The Funds' distributions are generally taxable to you as ordinary income, capital gains, or a combination of the two, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or an individual retirement account, in which case distributions may be taxable upon withdrawal.

Dividends paid to shareholders of the PIMCO Short Term Municipal Bond Active Exchange-Traded Fund, PIMCO Intermediate Municipal Bond Active Exchange-Traded Fund and PIMCO Municipal Income Opportunities Active Exchange-Traded Fund, derived from interest from debt securities whose interest is, in the opinion of bond counsel for the issuer at the time of issuance, exempt from federal income tax (“Municipal Bonds”) are expected to be reported by the Funds as “exempt-interest dividends” and shareholders may generally exclude such dividends from gross income for federal income tax purposes.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase Fund shares through a broker-dealer or other financial intermediary, PIMCO or other related companies may pay the intermediary for the sale of Fund shares or 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.

Summary Information About the Funds

This prospectus describes thirteen ETFs (each a “Fund,” collectively, the “Funds”) offered by PIMCO ETF Trust (the “Trust”). The Funds provide access to the professional investment advisory services offered by PIMCO. References to “the Fund” or “a Fund” relate to all Funds unless the context requires otherwise.

ETFs are funds that trade like other publicly-traded securities and may be designed to track an index or to be actively managed. Unlike conventional ETFs, the Funds are not index funds. The Funds are actively managed and do not seek to replicate the performance of a specified index. Unlike shares of a mutual fund, which can be bought from and redeemed by the issuing fund by all shareholders at a price based on NAV, shares of a Fund may be directly purchased from and redeemed by the Fund at NAV solely by a member or participant of a clearing agency registered with the Securities and Exchange Commission, which has a written agreement with the Fund’s Distributor that allows such member or participant to place orders for the purchase and redemption of Creation Units (as defined below) (“Authorized Participant“). Also unlike shares of a mutual fund, shares of ETFs are listed on a national securities exchange and trade in the secondary market at market prices that change throughout the day.

Shares of a Fund, except for the PIMCO Active Bond Exchange-Traded Fund, are listed and traded at market prices on NYSE Arca, Inc. (“NYSE Arca”) and other secondary markets, and the shares of the PIMCO Active Bond Exchange-Traded Fund are listed and traded at market prices on New York Stock Exchange (”NYSE“) and other secondary markets. The market price for a Fund’s shares may be different from the Fund’s NAV. The Funds issue and redeem shares at NAV only in aggregations of a specified number of shares (”Creation Units“). Only Authorized Participants may purchase or redeem Creation Units directly with a Fund at NAV. These transactions are in exchange for securities and/or cash. Except when aggregated in Creation Units, shares of a Fund are not redeemable securities. Shareholders who are not Authorized Participants may not purchase or redeem shares directly from a Fund.

If a Fund were to effect redemptions with an Authorized Participant primarily for cash, the Fund may be required to sell portfolio securities in order to obtain the cash needed to distribute redemption proceeds. The sale of portfolio securities could cause a Fund to recognize gains that it might not otherwise have recognized if redemptions were effected in-kind, or to recognize such gain sooner than would otherwise be required. Such gains will generally be distributed to shareholders to avoid taxation at the Fund level and to ensure compliance with other special tax rules that apply to the Funds. Moreover, the sale of portfolio securities will generally subject the Funds to transaction costs, which may be partially or totally offset by the variable transaction fee charged by the Funds to redeeming Authorized Participants.

An investment in a particular Fund alone should not constitute an entire investment program. This prospectus explains what you should know about the Funds before you invest. Please read it carefully. Certain affiliates of the Funds and PIMCO may purchase and resell Fund shares pursuant to this prospectus.

On each business day, before commencement of trading on NYSE Arca or NYSE for the PIMCO Active Bond Exchange-Traded Fund, each Fund will disclose on www.pimcoetfs.com the identities and quantities of the Fund’s portfolio holdings that will form the basis for the Fund’s

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Description of Principal Risks

The value of your investment in a Fund changes with the market price of the Fund’s shares determined in the secondary market. Market price may be determined, in part, by the values of a Fund’s investments. Many factors can affect those values. The factors that are most likely to have a material effect on a particular Fund’s portfolio as a whole are called “principal risks.” The principal risks of each Fund are identified in the Fund Summaries. The principal risks are described in more detail in this section. Each Fund may be subject to additional risks other than those identified and described below because the types of investments made by a Fund can change over time. Securities and investment techniques mentioned in this summary that appear in bold type are described in greater detail under “Characteristics and Risks of Securities and Investment Techniques.” That section and “Investment Objectives and Policies” in the Statement of Additional Information (the “SAI”) also include more information about the Funds, their investments and the related risks. There is no guarantee that a Fund will be able to achieve its investment objective. It is possible to lose money by investing in a Fund.

New Fund Risk

A new fund’s performance may not represent how the fund is expected to or may perform in the long term if and when it becomes larger and has fully implemented its investment strategies. Investment positions may have a disproportionate impact (negative or positive) on performance in new funds. New funds may also require a period of time before they are fully invested in securities that meet their investment objectives and policies and achieve a representative portfolio composition. Fund performance may be lower or higher during this “ramp-up” period, and may also be more volatile, than would be the case after the fund is fully invested. Similarly, a new fund’s investment strategy may require a longer period of time to show returns that are representative of the strategy. New funds have limited performance histories for investors to evaluate and new funds may not attract sufficient assets to achieve investment and trading efficiencies. If a new fund were to fail to successfully implement its investment strategies or achieve its investment objective, performance may be negatively impacted, and any resulting liquidation could create negative transaction costs for the fund and tax consequences for investors.

Small Fund Risk

A smaller fund may not grow to or maintain an economically viable size to achieve investment or trading efficiencies, which may negatively impact performance and/or force the fund to liquidate. Additionally, a smaller fund may be more adversely affected by large purchases or redemptions of fund shares, which can occur at any time and may impact the fund in the same manner as a high volume of purchases or redemptions.

Commodity Risk

The Commodity Strategy Active Exchange-Traded Fund's investments in commodity-linked derivative instruments and commodities, either directly or through the Subsidiary, may subject the Fund to greater volatility than investments in traditional securities. The value of commodity-linked derivative instruments or commodities may be affected by changes in inflation, overall market movements, foreign currency exchange rates, commodity index volatility, changes in interest rates, or supply and demand factors affecting a particular industry or commodity market, such as climate changes, weather, livestock disease, pandemics and public health emergencies, embargoes, taxation, war, terrorism, cyber hacking, economic and political developments, environmental proceedings, tariffs, changes in storage costs, availability of transportation systems, and international economic, political and regulatory developments. The value of commodities and commodity-linked derivative instruments may also experience significant price volatility as a result of being the target of market fraud and price manipulation. The Fund and its Subsidiary each may concentrate its assets in a particular sector of the commodities market (such as oil, metal, carbon or agricultural products). As a result, the Fund and the Subsidiary may be more susceptible to risks associated with those sectors. The prices for commodities in those sectors may fluctuate widely due to factors such as changes in value, supply and demand and governmental regulatory policies. Investments in commodities can also present risks associated with delivery, custody, storage and maintenance, illiquidity, and the unavailability of accurate market valuations of the commodity.

The PIMCO Commodity Strategy Active Exchange-Traded Fund may invest directly in commodities. Investments in commodities held directly by a Fund, including through warehouse receipts, can present additional risks associated with transportation and delivery, custody, storage and maintenance, illiquidity and the availability of accurate market valuations of the commodity. For example, a Fund's commodity holdings could be lost, damaged, stolen or destroyed, and access to a Fund's commodity holdings could be delayed by natural events (such as an earthquake) or human actions (such as a terrorist attack). Funds used to purchase commodities may be misappropriated, and the commodities underlying a warehouse receipt or other evidence of ownership of a commodity could be nonexistent, misappropriated or fail to meet agreed upon quality standards. Consequently, the value of a Fund's shares may be adversely affected by the loss, damage or destruction, misappropriation or delayed access to a Fund's commodity holdings. A Fund may also encounter higher custody, maintenance and other costs when holding a commodity directly as compared to ownership of securities or commodity-linked derivative instruments.

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Market Trading Risk

Each Fund is subject to secondary market trading risks. Shares of a Fund are listed for trading on an exchange, however, there can be no guarantee that an active trading market for such shares will develop or continue. Shares of a Fund may be listed or traded on U.S. and foreign (non-U.S.) exchanges other than the Fund’s primary U.S. listing exchange. There can be no guarantee that a Fund’s shares will continue trading on any exchange or in any market or that a Fund’s shares will continue to meet the listing or trading requirements of any exchange or market. A Fund’s shares may experience higher trading volumes on one exchange as compared to another and investors are subject to the execution and settlement risks of the market where their broker directs trades.

Secondary market trading in a Fund’s shares may be halted by an exchange because of market conditions. Pursuant to exchange or market rules, trading in a Fund’s shares on an exchange or in any market may be subject to trading halts caused by extraordinary market volatility. If secondary market trading is halted or an exchange closes earlier than anticipated, you may be unable to purchase or sell Fund shares. Additionally, the secondary market for trading an exchange-traded fund’s shares may become less liquid in stressed market conditions and when the underlying holdings of the exchange-traded fund are difficult to buy or sell. There can be no guarantee that a Fund’s exchange listing or ability to trade its shares will continue or remain unchanged. In the event a Fund ceases to be listed on an exchange, the Fund may cease operating as an “exchange-traded” fund and operate as a mutual fund, provided that shareholders are given advance notice.

Buying or selling a Fund’s shares on an exchange may require the payment of brokerage commissions. In addition, an investor who buys or sells may also incur the cost of the spread (the difference between the bid price and the ask price). The commission is frequently a fixed amount and may be a significant cost for investors seeking to buy or sell small amounts of shares. The spread varies over time for shares of a Fund based on their trading volume and market liquidity, and is generally less if the Fund has more trading volume and market liquidity and more if the Fund has less trading volume and market liquidity. Due to the costs inherent in buying or selling a Fund’s shares, frequent trading may detract significantly from investment returns. Investment in a Fund’s shares may not be advisable for investors who expect to engage in frequent trading.

Shares of a Fund may trade on an exchange at prices at, above or below their most recent NAV, which could result in an investor buying shares of the Fund at a higher price than the Fund’s NAV or selling shares of the Fund at a lower price than the Fund’s NAV. The market prices of Fund shares will fluctuate, sometimes rapidly and materially, in response to changes in the Fund’s NAV, the value of Fund holdings and supply and demand for Fund shares. Although the creation/redemption feature of the Funds generally makes it more likely that Fund shares will trade close to NAV, market volatility, lack of an active trading market for Fund shares, disruptions at market participants (such as Authorized Participants or market makers) and any disruptions in the ordinary functioning of the creation/redemption process may result in Fund shares trading significantly above (at a “premium”) or below (at a “discount”) NAV. Additionally, to the extent a Fund holds securities traded in markets that close at a different time from the Fund’s listing exchange, liquidity in such securities may be reduced after the applicable closing times, and during the time when the Fund’s listing exchange is open but after the applicable market closing, fixing or settlement times, bid/ask spreads and the resulting premium or discount to the Fund’s shares’ NAV may widen. You may be unable to sell your shares or may incur significant losses if you transact in Fund shares in these and other circumstances. Neither PIMCO nor the Trust can predict whether Fund shares will trade above, below or at NAV. A Fund’s investment results are based on the Fund’s daily NAV. Investors transacting in Fund shares in the secondary market, where market prices may differ from NAV, may experience investment results that differ from results based on the Fund’s daily NAV. There are various methods by which investors can purchase and sell shares and various orders that may be placed. Investors should consult their financial intermediary before purchasing or selling shares of a Fund.

A Fund has a limited number of intermediaries that act as Authorized Participants, and none of these Authorized Participants are or will be obligated to engage in creation or redemption transactions. To the extent that these intermediaries exit the business or are unable to or choose not to proceed with creation and/or redemption orders with respect to a Fund and no other Authorized Participant is able and willing to create or redeem, shares may trade at a discount to NAV and possibly face trading halts and/ or delisting. Additionally, while Fund shares are listed for trading on an exchange, there can be no assurance that active trading markets for Fund shares will be maintained by market makers or Authorized Participants.

Decisions by market makers or Authorized Participants to reduce their role or “step away” from these activities in times of market stress may inhibit the effectiveness of the creation/redemption process in maintaining the relationship between the underlying value of a Fund’s holdings and the Fund’s NAV. Such reduced effectiveness could result in the Fund’s shares trading at a discount to its NAV and also in greater than normal intraday bid/ask spreads for the Fund’s shares.

Capital Securities Risk

Capital Securities risk is the risk that a Fund’s investments in Capital Securities may decline in value in response to developments affecting financial institutions. Financial Institutions can be significantly affected by changes in legislation and regulations applicable to the financial markets. In addition, a Fund may lose money if issuers of Capital Securities become subject to increased competition, adverse changes in general or industry-specific economic conditions, or unfavorable interest rates. Issuers of Capital Securities may be particularly affected by factors such as the availability and cost of capital, rates of corporate and consumer debt defaults, and price competition. The financial sector (both domestic and foreign) has experienced a high degree of volatility in the past. This has resulted in significant regulatory change. These events and the possibility of future

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market volatility may have an adverse effect on a Fund. While many issuers of Capital Securities are subject to extensive federal and state regulations, and in certain cases federal insurance of deposits, such measures do not provide any guarantees against losses in the securities issued by such companies. By investing under normal circumstances at least 80% of its assets in a combination of preferred securities and Capital Securities, the Fund will be more susceptible to these risks than a fund that does not invest in Capital Securities to the same extent as the Fund.

Preferred Securities Risk

Preferred securities represent an equity interest in a company that generally entitles the holder to receive, in preference to the holders of other securities such as common stocks, dividends and a fixed share of the proceeds resulting from a liquidation of the company. Some preferred securities also entitle their holders to receive additional liquidation proceeds on the same basis as holders of a company’s common stock, and thus also represent an ownership interest in that company. Preferred securities may pay fixed or adjustable rates of return.

Preferred and other senior securities may pay fixed or adjustable rates of return. Preferred and other senior securities are subject to issuer-specific and market risks applicable generally to equity securities. In addition, a company’s preferred and other senior securities generally pay dividends only after the company makes required payments to holders of its bonds and other debt. For this reason, the value of preferred and other senior securities will usually react more strongly than bonds and other debt to actual or perceived changes in the company’s financial condition or prospects.

Preferred securities of smaller companies may be more vulnerable to adverse developments than preferred securities of larger companies.

Preferred securities include certain hybrid securities and other types of preferred securities with different features from those of traditional preferred securities described above. Preferred securities that are hybrid securities possess various features of both debt and traditional preferred securities and as such, they may constitute senior debt, junior debt or preferred shares in an issuer’s capital structure. Therefore, unlike traditional preferred securities, hybrid securities may not be subordinate to a company’s debt securities.

Preferred securities also include trust preferred securities, which have the characteristics of both subordinated debt and preferred securities. The primary advantage of the structure of trust preferred securities is that they are treated by the financial institution as debt securities for tax purposes and as equity for the calculation of capital requirements. Trust preferred securities typically bear a market rate coupon comparable to interest rates available on debt of a similarly rated issuer. Typical characteristics include long-term maturities, early redemption by the issuer, periodic fixed or variable interest payments, and maturities at face value. The market value of trust preferred securities may be more volatile than those of conventional debt securities. There can be no assurance as to the liquidity of trust preferred securities and the ability of holders, such as a Fund, to sell their holdings.

Concentration in Banking Industries Risk

The PIMCO Preferred and Capital Securities Active Exchange-Traded Fund will concentrate its investments in a group of industries related to banks. Industries related to banking are particularly susceptible to interest rate risk, market risk, increased competition and governmental actions (such as legislation and regulation). In addition, financial market volatility and borrowers’ financial difficulties may significantly affect the values of the Fund’s investments related to issuers in industries related to banking. More generally, market events and conditions, monetary policy and a number of related factors can affect issuers in industries related to banking in similar ways, resulting in relatively correlated price movements in instruments economically tied to such issuers. This can result in increased volatility in the value of the Fund’s holdings, and there is the possibility that many of the Fund’s holdings may lose value simultaneously.

Senior Loan Risk

To the extent a Fund invests in senior loans, including bank loans, the Fund may be subject to greater levels of credit risk, call risk, settlement risk and liquidity risk than funds that do not invest in such instruments. Senior loans are often issued by heavily indebted companies, and therefore can be particularly susceptible to a wide variety of risks. Senior loans may not be backed by adequate collateral and can be subject to faster payment schedules than other types of obligations. These instruments are considered predominantly speculative with respect to an issuer’s continuing ability to make principal and interest payments and may be more volatile and more difficult to value than other types of investments (including other debt securities). An economic downturn or individual corporate developments could adversely affect the market for these instruments and reduce a Fund’s ability to sell these instruments at an advantageous time or price. An economic downturn would generally lead to a higher non-payment rate, and a senior loan may lose significant market value before a default occurs. In addition, the senior loans in which a Fund invests may not be listed on any exchange and a secondary market for such loans may be less liquid than markets for other more liquid fixed income securities. Consequently, transactions in senior loans may involve greater costs than transactions in more actively traded instruments. Restrictions on transfers in loan agreements, a lack of publicly-available information, irregular trading activity and wide bid/ask spreads, among other factors, may, in certain circumstances, make senior loans more difficult to value accurately or sell at an advantageous time or price than other types of securities or instruments. These factors may result in a Fund being unable to realize full value for the senior loans and/or may result in a Fund not receiving the proceeds from a sale of a senior loan for an extended period after such sale, each of which could result in losses to a Fund.

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Senior loans may have extended trade settlement periods, including settlement periods of greater than 7 days, which may result in sale proceeds not being immediately available to a Fund. Loan purchasers have no entitlement to receive from loan sellers delayed compensation payments that are intended to incentivize shorter settlement periods. Consequently, there is no certainty that PIMCO will be able to obtain delayed compensation payments in connection with loan transactions. If an issuer of a senior loan prepays or redeems the loan prior to maturity, a Fund may have to reinvest the proceeds in instruments that pay lower interest rates. Senior loans in which a Fund invests may be collateralized, although the loans may not be fully collateralized and the collateral may be unavailable or insufficient to meet the obligations of the borrower. A Fund may have limited rights to exercise remedies against such collateral or a borrower, and loan agreements may impose certain procedures that delay receipt of the proceeds of collateral or require the Fund to act collectively with other creditors to exercise its rights with respect to a senior loan. Because of the risks involved in investing in senior loans, an investment in a Fund that invests in such instruments should be considered speculative. Senior loans may not be considered securities under the federal securities laws. In such circumstances, fewer legal protections may be available with respect to the Fund's investment in senior loans. Senior loans that are covenant-lite obligations contain fewer maintenance covenants than other types of loans, or no maintenance covenants, and may not include terms that allow the lender to monitor the performance of the borrower and declare a default if certain criteria are breached. Covenant-lite obligations may carry more risk than traditional loans as they allow borrowers to engage in activities that would otherwise be difficult or impossible under a covenant-heavy loan agreement. In the event of default, covenant-lite obligations may exhibit diminished recovery values as the lender may not have the opportunity to negotiate with the borrower prior to default. A Fund may have a greater risk of loss on investments in covenant-lite obligations as compared to investments in traditional loans.

Oil-Related Risk

Investments in or tied to the price of oil are considered speculative. A Fund's investments tied to the price of oil may fluctuate substantially over short periods of time or be more volatile than other types of investments due to events affecting the supply and demand of oil, including, among other things, policies of OPEC and other oil exporting countries, changes in relationships among OPEC and other oil exporting countries and oil importing countries and the economies of the key energy-consuming countries. Oil prices may also be affected by changes in oil exploration and production spending, interest rates and exchange rates, government regulation, the imposition of import and export controls, negative perception of oil, depletion of oil resources, development of alternative energy sources and other technological developments, labor relations and general economic conditions, as well as market, economic and political risks of the countries where oil refining companies are located or do business, fluctuations caused by events relating to international politics, including political instability, expropriation, social unrest, war, terrorism, economic sanctions, energy conservation policies, the success of exploration projects and tax and other governmental regulatory policies.

Gold-Related Risk

Investments in instruments tied to the price of gold are considered speculative. A Fund’s investments in instruments tied to the price of gold may fluctuate substantially over short periods of time or subject the Fund to greater volatility than other types of investments due to many factors, such as changes in interest rates, inflation or inflation expectations, the supply of gold, commercial and industrial demand for gold, purchases or sales of gold by entities such as governments or central banks, other actions by governments such as monetary policy changes or restrictions on ownership, investment speculation, or other economic, financial or political factors. Moreover, the majority of gold producers are located in a limited number of countries, and economic, political or other factors affecting one or more major sources of gold may have substantial effects on gold prices. A Fund’s gold-related investments will primarily consist of derivative instruments tied to the price of gold, such as options, futures and swaps, as opposed to direct investments in gold bullion.

Interest Rate Risk

Interest rate risk is the risk that fixed income securities and other instruments in a Fund’s portfolio will fluctuate in value because of a change in interest rates. For example, as nominal interest rates rise, the value of certain fixed income securities held by a Fund is likely to decrease. A nominal interest rate can be described as the sum of a real interest rate and an expected inflation rate. Interest rate changes can be sudden and unpredictable, and a Fund may lose money as a result of movements in interest rates. A Fund may not be able to hedge against changes in interest rates or may choose not to do so for cost or other reasons. In addition, any hedges may not work as intended.

Fixed income securities with longer durations tend to be more sensitive to changes in interest rates, usually making them more volatile than securities with shorter durations. The values of equity and other non-fixed income securities may also decline due to fluctuations in interest rates. Inflation-indexed bonds, including Treasury Inflation-Protected Securities (“TIPS”), decline in value when real interest rates rise. In certain interest rate environments, such as when real interest rates are rising faster than nominal interest rates, inflation-indexed bonds may experience greater losses than other fixed income securities with similar durations.

Dividend-paying equity securities, particularly those whose market price is closely related to their yield, may be more sensitive to changes in interest rates. During periods of rising interest rates, the values of such securities may decline and may result in losses to the Fund.

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Variable and 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. Inverse floating rate securities may decrease in value if interest rates increase. Inverse floating rate securities may also exhibit greater price volatility than a fixed rate obligation with similar credit quality. When a Fund holds variable or floating rate securities, a decrease (or, in the case of inverse floating rate securities, an increase) in market interest rates will adversely affect the income received from such securities and the NAV of the Fund’s shares.

A wide variety of factors can cause interest rates or yields of U.S. Treasury securities (or yields of other types of bonds) to rise, including but not limited to central bank monetary policies, changing inflation or real growth rates, general economic conditions, increasing bond issuances or reduced market demand for low yielding investments. Risks associated with rising interest rates are heightened under recent market conditions, including because the U.S. Federal Reserve (the “Federal Reserve”) has raised interest rates from historically low levels and the U.S. and other governments have increased, and are likely to continue increasing, their debt issuances. There is the risk that the income generated by investments may not keep pace with inflation. Actions by governments and central banking authorities can result in increases or decreases in interest rates. Periods of higher inflation could cause such authorities to raise interest rates, which may adversely affect a Fund and its investments. In addition, changes in monetary policy may exacerbate the risks associated with changing interest rates. Further, in market environments where interest rates are rising, issuers may be less willing or able to make principal and interest payments on fixed income investments when due.

Rising interest rates may result in a decline in value of a Fund’s fixed income investments and in periods of volatility. Further, while U.S. bond markets have steadily grown over the past three decades, dealer “market making” ability has remained relatively stagnant. As a result, dealer inventories of certain types of bonds and similar instruments, which provide a core indication of the ability of financial intermediaries to “make markets,” are at or near historic lows in relation to market size. Because market makers provide stability to a market through their intermediary services, the significant reduction in dealer inventories could potentially lead to decreased liquidity and increased volatility in the fixed income markets. Such issues may be exacerbated during periods of economic uncertainty. All of these factors, collectively and/or individually, could cause a Fund to lose value.

During periods of very low or negative interest rates, a Fund may be unable to maintain positive returns. Certain European countries have previously experienced negative interest rates on certain fixed income instruments. Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, may result in heightened market volatility and may detract from a Fund’s performance to the extent the Fund is exposed to such interest rates.

Measures such as average duration may not accurately reflect the true interest rate sensitivity of a Fund. This is especially the case if a Fund consists of securities with widely varying durations. Therefore, if a Fund has an average duration that suggests a certain level of interest rate risk, the Fund may in fact be subject to greater interest rate risk than the average would suggest. This risk is greater to the extent a Fund uses leverage or derivatives in connection with the management of the Fund.

Convexity is an additional measure used to understand a security’s or a Fund‘s interest rate sensitivity. Convexity measures the rate of change of duration in response to changes in interest rates. With respect to a security’s price, a larger convexity (positive or negative) may imply more dramatic price changes in response to changing interest rates. Convexity may be positive or negative. Negative convexity implies that interest rate increases result in increased duration, meaning increased sensitivity in prices in response to rising interest rates. Thus, securities with negative convexity, which may include bonds with traditional call features and certain mortgage-backed securities, may experience greater losses in periods of rising interest rates. Accordingly, if a Fund holds such securities, the Fund may be subject to a greater risk of losses in periods of rising interest rates.

Call Risk

Call risk refers to the possibility that an issuer may exercise its right to redeem a fixed income security earlier than expected (a call). Issuers may call outstanding securities prior to their maturity for a number of reasons (e.g., declining interest rates, changes in credit spreads and improvements in the issuer’s credit quality). If an issuer calls a security in which a Fund has invested, the Fund may not recoup the full amount of its initial investment or may not realize the full anticipated earnings from the investment and may be forced to reinvest in lower-yielding securities, securities with greater credit risks or securities with other, less favorable features.

Credit Risk

A Fund could lose money if the issuer or guarantor of a fixed income security (including a security purchased with securities lending collateral), or the counterparty to a derivatives contract, in the case of each Fund (except the PIMCO Ultra Short Government Active Exchange-Traded Fund and PIMCO Prime Limited Maturity Active Exchange-Traded Fund), or a repurchase agreement or a loan of portfolio securities, or the issuer or guarantor of collateral, is unable or unwilling, or is perceived (whether by market participants, rating agencies, pricing services or otherwise) as unable or unwilling, to make timely principal and/or interest payments, or to otherwise honor its obligations. The risk that such issuer, guarantor or counterparty is less willing or able to do so is heightened in market environments where interest rates are rising. The downgrade of the credit rating of a security or of the issuer of a security held by a Fund may decrease its value. Securities are subject to varying degrees of credit risk, which are often

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reflected in credit ratings. Measures such as average credit quality may not accurately reflect the true credit risk of a Fund. This is especially the case if a Fund consists of securities with widely varying credit ratings. Therefore, if a Fund has an average credit rating that suggests a certain credit quality, the Fund may in fact be subject to greater credit risk than the average would suggest. Credit risk is greater to the extent a Fund uses leverage or derivatives. Municipal bonds are subject to the risk that litigation, legislation or other political events, local business or economic conditions, or the bankruptcy of the issuer could have a significant effect on an issuer’s ability to make payments of principal and/or interest. Rising or high interest rates may deteriorate the credit quality of an issuer or counterparty, particularly if an issuer or a counterparty faces challenges rolling or refinancing its obligations.

Collateralized Loan Obligations Risk

Certain Funds may invest in collateralized loan obligation (“CLOs”) and other similarly structured investments. A CLO is a trust typically collateralized by a pool of loans, which may include, among others, domestic and foreign senior secured loans, senior unsecured loans and subordinate corporate loans, including loans that may be rated below investment grade or equivalent unrated loans. In addition to the risks associated with investment in such underlying assets, the structure and characteristics of a CLO present certain additional risks. A Fund’s investments in CLOs and other similarly structured investments may expose the Fund to heightened credit risk, interest rate risk, liquidity risk, market risk and prepayment and extension risk, as well as the risk of default on the underlying asset. In addition, investments in CLOs carry additional risks including, but not limited to: (i) the possibility that distributions from collateral securities will not be adequate to make interest or other payments; (ii) the quality of the collateral may decline in value or default; (iii) risks related to the capability of the servicer of the securitized assets; (iv) the risk that a Fund may invest in tranches of CLOs that are subordinate to other tranches; (v) the structure and complexity of the transaction and the legal documents may not be fully understood at the time of investment and could lead to disputes with the issuer or among investors regarding the characterization of proceeds or unexpected investment results; and (vi) the CLO’s manager may perform poorly. CLOs may charge management and other administrative fees, which are in addition to those of a Fund.

The cash flows from a CLO are split into two or more portions, called tranches, varying in risk and yield. Losses caused by defaults on underlying assets are borne first by the holders of subordinate tranches. Tranches are categorized as senior, mezzanine and subordinated/equity, according to their degree of risk. If there are defaults or the CLO’s collateral otherwise underperforms, scheduled payments to senior tranches take precedence over those of mezzanine tranches, and scheduled payments to mezzanine tranches take precedence over those of subordinated/equity tranches. The riskiest portion is the “equity” tranche which bears the first loss of any defaults from the bonds or loans in the trust, although more senior tranches may also bear losses. Since they are partially protected from defaults, senior tranches from a CLO typically have higher ratings and lower yields than their underlying securities, and can be rated investment grade. Despite the protection from the equity tranche, CLO tranches can experience substantial losses due to actual defaults, increased sensitivity to defaults due to collateral default and disappearance of protecting tranches, market anticipation of defaults, as well as aversion to CLO securities as a class. The risks of an investment in a CLO depend largely on the type of the collateral securities and the class of the instrument in which a Fund invests. Typically, CLOs are privately offered and sold, and thus, are not registered under the securities laws.

High Yield Risk

Funds that invest in high yield securities and unrated securities of similar credit quality (commonly known as “high yield securities” or “junk bonds”) may be subject to greater levels of credit risk, call risk and liquidity risk than funds that do not invest in such securities. These securities are considered predominantly speculative with respect to an issuer’s continuing ability to make principal and interest payments, and may be more volatile than other types of securities. An economic downturn or individual corporate developments could adversely affect the market for these securities and reduce a Fund’s ability to sell these securities at an advantageous time or price. An economic downturn would generally lead to a higher non-payment rate and, a high yield security may lose significant market value before a default occurs. High yield securities structured as zero-coupon bonds or pay-in-kind securities tend to be especially volatile as they are particularly sensitive to downward pricing pressures from rising interest rates or widening spreads and may require a Fund to make taxable distributions of imputed income without receiving the actual cash currency. Issuers of high yield securities may have the right to “call” or redeem the issue prior to maturity, which may result in a Fund having to reinvest the proceeds in other high yield securities or similar instruments that may pay lower interest rates. A Fund may also be subject to greater levels of liquidity risk than funds that do not invest in high yield securities. In addition, the high yield securities in which a Fund invests may not be listed on any exchange and a secondary market for such securities may be comparatively illiquid relative to markets for other more liquid fixed income securities. Consequently, transactions in high yield securities may involve greater costs than transactions in more actively traded securities. A lack of publicly-available information, irregular trading activity and wide bid/ask spreads among other factors, may, in certain circumstances, make high yield debt more difficult to sell at an advantageous time or price than other types of securities or instruments. These factors may result in a Fund being unable to realize full value for these securities and/or may result in a Fund not receiving the proceeds from a sale of a high yield security for an extended period after such sale, each of which could result in losses to a Fund. In addition, adverse publicity and investor perceptions, whether or not based on fundamental analysis, may decrease the values and liquidity of high yield securities, especially in thinly-traded markets. When secondary

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markets for high yield securities are less liquid than the market for other types of securities, it may be more difficult to value the securities because such valuation may require more research, and elements of judgments may play a greater role in the valuation because there is less reliable, objective data available. Because of the risks involved in investing in high yield securities, an investment in a Fund that invests in such securities should be considered speculative.

Market Risk

The market price of securities owned by a Fund may go up or down, sometimes rapidly or unpredictably. Securities may decline in value due to factors affecting securities markets generally or particular industries or issuers represented in the securities markets. The value of a security may decline due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in inflation, interest or currency rates, adverse changes to credit markets or adverse investor sentiment generally. The value of a security may also decline due to factors that affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry. During a general downturn in the securities markets, multiple asset classes may decline in value simultaneously even if the performance of those asset classes is not otherwise historically correlated. Investments may also be negatively impacted by market disruptions and by attempts by other market participants to manipulate the prices of particular investments. Equity securities generally have greater price volatility than fixed income securities. Credit ratings downgrades may also negatively affect securities held by a Fund. Even when markets perform well, there is no assurance that the investments held by a Fund will increase in value along with the broader market.

In addition, market risk includes the risk that geopolitical and other events will disrupt the economy on a national or global level. For instance, war, terrorism, social unrest, recessions, supply chain disruptions, market manipulation, government defaults, government shutdowns, political changes, diplomatic developments, or the imposition of sanctions and other similar measures, public health emergencies (such as the spread of infectious diseases, pandemics and epidemics) and natural/environmental disasters can all negatively impact the securities markets, which could cause a Fund to lose value. These events could reduce consumer demand or economic output, result in market closures, changes in interest rates, inflation/deflation, travel restrictions or quarantines, and significantly adversely impact the economy. The current contentious domestic political environment, as well as political and diplomatic events within the United States and abroad, such as presidential elections in the U.S. or abroad or the U.S. government’s inability at times to agree on a long-term budget and deficit reduction plan, has in the past resulted, and may in the future result, in a government shutdown or otherwise adversely affect the U.S. regulatory landscape, the general market environment and/or investor sentiment, which could have an adverse impact on a Fund’s investments and operations. Additional and/or prolonged U.S. federal government shutdowns may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree. Governmental and quasi-governmental authorities and regulators throughout the world have previously responded to serious 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. An unexpected or sudden reversal of these policies, or the ineffectiveness of these policies, could increase volatility in securities markets, which could adversely affect a Fund’s investments. Any market disruptions could also prevent a Fund from executing advantageous investment decisions in a timely manner. Funds that have focused their investments in a region enduring geopolitical market disruption will face higher risks of loss, although the increasing interconnectivity between global economies and financial markets can lead to events or conditions in one country, region or financial market adversely impacting a different country, region or financial market. Thus, investors should closely monitor current market conditions to determine whether a Fund meets their individual financial needs and tolerance for risk.

Current market conditions may pose heightened risks with respect to a Fund that may invest in fixed income securities. As discussed more under “Interest Rate Risk,” the Federal Reserve has raised interest rates from historically low levels. In addition, changes in monetary policy may exacerbate the risks associated with changing interest rates. Interest rate increases in the future could cause the value of a Fund to decrease. During inflationary price movements, fixed income securities markets may experience heightened levels of interest rate, volatility and liquidity risk. Interest rate increases in the future could cause the value of a fund that invests in fixed income securities to decrease. If rising interest rates cause a Fund to lose enough value, the Fund could also face increased shareholder redemptions, which could force the Fund to liquidate investments at disadvantageous times or prices, therefore adversely affecting the Fund and its shareholders.

Although interest rates have increased from their lows and other market events have taken place, the prices of real estate-related assets generally have not decreased as much as may be expected based on historical correlations between interest rate movements and the prices of real estate-related assets. This and other developments present an increased risk of a correction or severe downturn in real estate-related asset prices, which could adversely impact the value of other investments as well (such as loans, securitized debt and other Fixed Income Instruments). This risk is particularly present with respect to commercial real estate-related asset prices, and the value of other investments. For example, tenant vacancy rates, tenant turnover and tenant concentration have increased; owners of real estate have faced headwinds, delinquencies and difficulties in collecting rents and other payments (which increases the risk of owners being unable to pay or otherwise defaulting on their own borrowings and obligations); property values have declined; inflation, upkeep costs and other expenses have increased; rents have declined for many properties; and ownership of certain types of properties has become more concentrated.

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Exchanges and securities markets may close early, close late or issue trading halts on specific securities or generally, which may result in, among other things, a Fund being unable to buy or sell certain securities or financial instruments at an advantageous time or accurately price its portfolio investments. In addition, a Fund may rely on various third-party sources to calculate its NAV. As a result, a Fund is subject to certain operational risks associated with reliance on service providers and service providers’ data sources. In particular, errors or systems failures and other technological issues may adversely impact a Fund’s calculation of its NAV, and such NAV calculation issues may result in inaccurately calculated NAV, delays in NAV calculation and/or the inability to calculate NAVs over extended periods. A Fund may be unable to recover any losses associated with such failures.

Municipal Bond Risk

A Fund that invests in Municipal Bonds may be affected significantly by the economic, regulatory or political developments affecting the ability of issuers of Municipal Bonds to pay interest or repay principal. In addition, the ability of an issuer to make payments or repay interest may be affected by litigation or bankruptcy. In the event of bankruptcy of such an issuer, a Fund investing in the issuer’s securities could experience delays in collecting principal and interest, and a Fund may not, in all circumstances, be able to collect all principal and interest to which it is entitled. To enforce its rights in the event of a default in the payment of interest or repayment of principal, or both, a Fund may, in some instances, take possession of, and manage, the assets securing the issuer’s obligations on such securities, which may increase the Fund’s operating expenses. Any income derived from a Fund’s ownership or operation of such assets may not be tax-exempt. Municipal Bonds are subject to interest rate, credit and market risk.

The income, value and/or risk of Municipal Bonds is often correlated to specific project or other revenue sources (such as taxes), which can be affected by demographic trends, such as population shifts or changing tastes and values, or increasing vacancies or declining rents resulting from legal, cultural, technological, global or local economic developments, as well as reduced demand for properties, revenues or goods. Because many Municipal Bonds are issued to finance similar projects (such as those relating to education, health care, housing, transportation and utilities), conditions in those sectors may affect the overall municipal securities market. In addition, changes in the financial condition of an individual municipal issuer can affect the overall municipal market. Municipal Bonds backed by current or anticipated revenues from a specific project or specific assets can be affected by the discontinuance of the supporting taxation or the inability to collect revenues for the specific project or specific assets. Municipal Bonds are subject to the risk that the Internal Revenue Service (“IRS”) may determine that an issuer has not complied with applicable tax requirements and that interest from the Municipal Bond is taxable, which may result in a significant decline in the value of the security. Municipal Bonds may be less liquid than taxable bonds and there may be less publicly available information on the financial condition of Municipal Bond issuers than for issuers of other securities, and the investment performance of a Fund investing in Municipal Bonds may therefore be more dependent on the analytical abilities of PIMCO than if a Fund held other types of investments such as stocks or taxable bonds. The secondary market for Municipal Bonds also tends to be less well-developed or liquid than many other securities markets, a by-product of lower capital commitments to the asset class by the dealer community, which may adversely affect a Fund’s ability to sell Municipal Bonds it holds at attractive prices or value Municipal Bonds.

Certain Funds may invest in municipal securities (including taxable municipal securities) issued by Puerto Rico. A Fund's investments in municipal securities issued by Puerto Rico may be particularly affected by political, economic, regulatory or restructuring developments affecting the ability of Puerto Rican municipal issuers to pay interest or repay principal.

Issuer Risk

The value of a security may decline for a number of reasons that directly relate to the issuer, such as management performance major litigation, investigations or other controversies, changes in the issuer’s financial condition or credit rating, changes in government regulations affecting the issuer or its competitive environment and strategic initiatives such as mergers, acquisitions or dispositions and the market response to any such initiatives, financial leverage, reputation or reduced demand for the issuer’s goods or services, as well as the historical and prospective earnings of the issuer and the value of its assets. A change in the financial condition of a single issuer may affect one or more other issuers or securities markets as a whole.

Liquidity Risk

The Securities and Exchange Commission (the “SEC”) defines liquidity risk as the risk that a Fund could not meet requests to redeem shares issued by a Fund without significant dilution of remaining investors’ interests in a Fund. Liquidity risk exists when particular investments are difficult to purchase or sell. Illiquid investments are investments that a Fund reasonably expects cannot be sold or disposed of in current market conditions in seven calendar days or less without the sale or disposition significantly changing the market value of the investment. Illiquid investments may become harder to value, especially in changing markets. A Fund’s investments in illiquid investments may reduce the returns of the Fund because it may be unable to sell the illiquid investments at an advantageous time or price or possibly require a Fund to dispose of other investments at unfavorable times or prices in order to satisfy its obligations, which could prevent the Fund from taking advantage of other investment opportunities. Additionally, the market for certain investments may become illiquid under adverse market or economic conditions independent of any specific adverse changes in the conditions of a particular issuer, such as during political events (including periods of rapid interest rate changes). There can be no assurance that an investment that is deemed to be liquid when purchased will continue to be liquid while it is held by a Fund and/or when a Fund

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wishes to dispose of it. Bond markets have consistently grown over the past three decades while the capacity for traditional dealer counterparties to engage in fixed income trading has not kept pace and in some cases has decreased. As a result, dealer inventories of corporate bonds, which provide a core indication of the ability of financial intermediaries to “make markets,” are at or near historic lows in relation to market size. Because market makers seek to provide stability to a market through their intermediary services, the significant reduction in dealer inventories could potentially lead to decreased liquidity and increased volatility in the fixed income markets. Such issues may be exacerbated during periods of economic uncertainty.

In such cases, a Fund, due to regulatory limitations on investments in illiquid investments and the difficulty in purchasing and selling such securities or instruments, may be unable to achieve its desired level of exposure to a certain sector. To the extent that a Fund’s principal investment strategies involve securities of companies with smaller market capitalizations, foreign (non-U.S.) securities, Rule 144A securities, illiquid sectors of fixed income securities, derivatives or securities with substantial market and/or credit risk, the Fund will tend to have the greatest exposure to liquidity risk. Further, fixed income securities with longer durations until maturity face heightened levels of liquidity risk as compared to fixed income securities with shorter durations until maturity. Finally, 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. It may also be the case that other market participants may be attempting to liquidate fixed income holdings at the same time as a Fund, causing increased supply in the market and contributing to liquidity risk and downward pricing pressure.

Certain accounts or PIMCO affiliates may from time to time own (beneficially or of record) or control a significant percentage of a Fund’s shares. If these shareholders sell their Fund shares, this may impact the Fund's NAV and the market price and the secondary market liquidity of Fund shares. These transactions may also result in the Fund selling certain of its portfolio holdings, which may negatively impact the Fund's performance.

Liquidity risk also refers to the risk that a Fund may be required to hold additional cash or sell other investments in order to obtain cash to close out derivatives or meet the liquidity demands that derivatives can create to make payments of margin, collateral, or settlement payments to counterparties. A Fund may have to sell a security at a disadvantageous time or price to meet such obligations.

Actions by governments and regulators may have the effect of reducing market liquidity, market resiliency and money supply, such as through higher rates, tighter financial regulations and proposals related to open-end fund liquidity that may prevent mutual funds and exchange-traded funds from participating in certain markets.

Derivatives Risk

Derivatives and other similar instruments (referred to collectively as “derivatives”) are financial contracts whose value depends on, or is derived from, the value of an underlying asset, reference rate or index. The various derivative instruments that each Fund (except the PIMCO Prime Limited Maturity Active Exchange-Traded Fund and PIMCO Ultra Short Government Active Exchange-Traded Fund) may use are referenced under “Characteristics and Risks of Securities and Investment Techniques—Derivatives” in this Prospectus and described in more detail under “Investment Objectives and Policies” in the SAI. The Funds typically use derivatives as a substitute for taking a position in the underlying asset, as part of strategies designed to gain exposure to, for example, issuers, portions of the yield curve, indexes, sectors, currencies, and/or geographic regions, and/or to reduce exposure to other risks, such as interest rate, credit or currency risk. The Funds may also use derivatives for leverage, in which case their use would involve leveraging risk, and in some cases, may subject a Fund to the potential for unlimited loss. The use of derivatives may cause the Fund’s investment returns to be impacted by the performance of securities the Fund does not own and result in the Fund’s total investment exposure exceeding the value of its portfolio.

A Fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. Derivatives are subject to a number of risks described elsewhere in this section, such as liquidity risk (which may be heightened for highly-customized derivatives), interest rate risk, market risk, leverage risk, counterparty (including credit) risk, operational risk (such as documentation issues, settlement issues and systems failures), legal risk (such as insufficient documentation, insufficient capacity or authority of a counterparty, and issues with the legality or enforceability of a contract) and management risk, as well as risks arising from changes in applicable requirements, risks arising from margin requirements and risks arising from mispricing or valuation complexity. They also involve the risk that changes in the value of a derivative instrument may not correlate perfectly with the underlying asset, rate or index. By investing in a derivative instrument, the Fund could lose more than the initial amount invested and derivatives may increase the volatility of the Fund, especially in unusual or extreme market conditions. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. The 1940 Act and related rules no longer require asset segregation for derivatives transactions, however asset segregation and posting of collateral may still be utilized for risk management or other purposes. A Fund may be required to hold additional cash or sell other investments in order to obtain cash to close out a position and changes in the value of a derivative may also create margin delivery or settlement payment obligations for the Fund. Also, suitable derivative transactions may not be available in all circumstances and there can be no assurance that a Fund will engage in these transactions to reduce exposure to other risks when that would be beneficial or that, if used, such strategies will be successful. In addition, a Fund’s use of derivatives may increase or accelerate the amount of taxes payable by shareholders. Non-centrally-cleared OTC derivatives are also subject to the

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risk that a counterparty to the transaction will not fulfill its contractual obligations to the other party, as many of the protections afforded to centrally-cleared derivative transactions might not be available for non-centrally-cleared OTC derivatives. The primary credit risk on derivatives or other similar investments that are exchange-traded or traded through a central clearing counterparty resides with the Fund’s clearing broker, or the clearinghouse.

Participation in the markets for derivative instruments involves investment risks and transaction costs to which a Fund may not be subject absent the use of these strategies. The skills needed to successfully execute derivative strategies may be different from those needed for other types of transactions. If the Fund incorrectly forecasts the value and/or creditworthiness of securities, currencies, interest rates, counterparties or other economic factors involved in a derivative transaction, the Fund might have been in a better position if the Fund had not entered into such derivative transaction. In evaluating the risks and contractual obligations associated with particular derivative instruments, it is important to consider that certain derivative transactions may be modified or terminated only by mutual consent of a Fund and its counterparty. Therefore, it may not be possible for the Fund to modify, terminate, or offset the Fund’s obligations or the Fund’s exposure to the risks associated with a derivative transaction prior to its scheduled termination or maturity date, which may create a possibility of increased volatility and/or decreased liquidity to the Fund. In such case, the Fund may lose money.

Because the markets for certain derivative instruments (including markets located in foreign countries) are relatively new and still developing, appropriate derivative transactions may not be available in all circumstances for risk management or other purposes. Upon the expiration of a particular contract, a Fund may wish to retain its position in the derivative instrument by entering into a similar contract, but may be unable to do so if the counterparty to the original contract is unwilling to enter into the new contract and no other appropriate counterparty can be found. When such markets are unavailable, a Fund will be subject to increased liquidity and investment risk.

When a derivative is used as a hedge against a position that a Fund holds, any loss generated by the derivative generally should be substantially offset by gains on the hedged investment, and vice versa. Although hedging can reduce or eliminate losses, it can also reduce or eliminate gains. Hedges are sometimes subject to imperfect matching between the derivative and the underlying instrument, and there can be no assurance that a Fund’s hedging transactions will be effective. Derivatives used for hedging or risk management may not operate as intended or may expose a Fund to additional risks. In addition, derivatives used for hedging may partially protect a Fund from the risks they were intended to hedge yet not fully mitigate the impact of such risks.

The regulation of the derivatives markets has increased over the past several years, and additional future regulation of the derivatives markets may make derivatives more costly, may limit the availability or reduce the liquidity of derivatives, or may otherwise adversely affect the value or performance of derivatives. Any such adverse future developments could impair the effectiveness or raise the costs of a Fund’s derivative transactions, impede the employment of the Fund’s derivatives strategies, or adversely affect the Fund’s performance.

Issuer Non-Diversification Risk

Focusing investments in a small number of issuers increases risk. Funds that are “non-diversified” may invest a greater percentage of their assets in the securities of a single issuer (such as bonds issued by a particular state) than funds that are “diversified.” Funds that invest in a relatively small number of issuers are more susceptible to risks associated with a single economic, political or regulatory occurrence than a more diversified portfolio might be. Some of those issuers also may present substantial credit or other risks.

Model Risk

In making investment allocation decisions for the PIMCO Commodity Strategy Exchange-Traded Fund, PIMCO may utilize quantitative models that may be proprietary or developed by third-parties. These models are used by PIMCO to determine (or assist in determining) the Fund’s target asset allocation and to identify potentially attractive relative value and risk hedging strategies. The investment models used in making investment allocation decisions may not adequately take into account certain factors, may contain design flaws or faulty assumptions, and may rely on incomplete or inaccurate data, any of which may result in a decline in the value of an investment in the Fund. There can be no assurance that the models used by PIMCO will remain viable, due to various factors, which may include the quality of the data input into the models and the assumptions underlying such models, which to varying degrees involve the exercise of judgment, as well as the possibility of errors in constructing or using the model.

Models rely on accurate market data inputs. If inaccurate market data is entered into a model, the resulting information will be incorrect. In addition, the models used may be predictive in nature and such models may result in an incorrect assessment of future events. The models evaluate securities or securities markets based on certain assumptions concerning the interplay of market factors. The markets or the prices of individual securities may be affected by factors not foreseen in developing the models. In addition, when relying on a quantitative model and/or data supplied by third parties, PIMCO may have less insight into the construction, coding or testing of the third-party model or data, and PIMCO will be exposed to systems, cyber security and other risks associated with the third party that provides the model or data.

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The use of models can be complex and involves financial, economic, econometric and statistical theories, research and modeling; and the results of those processes must then be translated into computer code. Although PIMCO seeks to hire individuals and/or third parties, as applicable, skilled in each of these functions and to provide appropriate levels of oversight, the complexity of the individual tasks, the difficulty of integrating such tasks, and the limited ability to perform “real world” testing of a model’s end product raises the chances that a finished model may contain an error; one or more of such errors could adversely affect a Fund’s performance.

Equity Risk

Equity securities represent an ownership interest, or the right to acquire an ownership interest, in an issuer. Equity securities also include, among other things, common stocks, preferred securities, convertible stocks and warrants. The values of equity securities, such as common stocks and preferred securities, may decline due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in inflation, interest or currency rates, or adverse investor sentiment generally. They may also decline due to factors that affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry.Conversely, a change in financial condition or other event affecting a single issuer or industry may adversely impact securities markets as a whole. Equity securities generally have greater price volatility than most fixed income securities. These risks are generally magnified in the case of equity investments in distressed companies.

Mortgage-Related and Other Asset-Backed Securities Risk

Mortgage-related and other asset-backed securities represent interests in “pools” of mortgages or other assets such as consumer loans or receivables held in trust and often involve risks that are different from or possibly more acute than risks associated with other types of debt instruments. Generally, rising interest rates tend to extend the duration of fixed rate mortgage-related securities, making them more sensitive to changes in interest rates. Compared to other fixed income investments with similar maturity and credit, mortgage-related securities may increase in value to a lesser extent when interest rates decline and may decline in value to a similar or greater extent when interest rates rise. As a result, in a period of rising interest rates, if a Fund holds mortgage-related securities, it may exhibit additional volatility since individual mortgage holders are less likely to exercise prepayment options, thereby putting additional downward pressure on the value of these securities and potentially causing the Fund to lose money. This is known as extension risk. Mortgage-backed securities can be highly sensitive to rising interest rates, such that even small movements can cause an investing Fund to lose value. Mortgage-backed securities, and in particular those not backed by a government guarantee, are subject to credit risk. In addition, adjustable and fixed rate mortgage-related securities are subject to prepayment risk. When interest rates decline, borrowers may pay off their mortgages sooner than expected. This can reduce the returns of a Fund because the Fund may have to reinvest that money at the lower prevailing interest rates. In addition, the creditworthiness, servicing practices, and financial viability of the servicers of the underlying mortgage pools present significant risks. For instance, a servicer may be required to make advances in respect of delinquent loans underlying the mortgage-related securities; however, servicers experiencing financial difficulties may not be able to perform these obligations. Additionally, both mortgage-related securities and asset-backed securities are subject to risks associated with fraud or negligence by, or defalcation of, their servicers. These securities are also subject to the risks of the underlying loans. In some circumstances, a servicer’s or originator’s mishandling of documentation related to the underlying collateral (e.g., failure to properly document a security interest in the underlying collateral) may affect the rights of security holders in and to the underlying collateral. In addition, the underlying loans may have been extended pursuant to inappropriate underwriting guidelines, to no underwriting guidelines at all, or to fraudulent origination practices. The owner of a mortgage-backed security’s ability to recover against the sponsor, servicer or originator is uncertain and is often limited.

A Fund’s investments in other asset-backed securities are subject to risks similar to those associated with mortgage-related securities, as well as additional risks associated with the nature of the assets and the servicing of those assets. Payment of principal and interest on asset-backed securities may be largely dependent upon the cash flows generated by the assets backing the securities, and asset-backed securities may not have the benefit of any security interest in the related assets. A Fund may invest in any tranche of mortgage-related and other asset-backed securities, including junior and/or equity tranches (to the extent consistent with other of the Fund’s guidelines), which generally carry higher levels of the foregoing risks.

Foreign (Non-U.S.) Investment Risk

Foreign (non-U.S.) securities may experience more rapid and extreme changes in value than securities of U.S. issuers or securities that trade exclusively in U.S. markets. The securities markets of many foreign (non-U.S.) countries are relatively small, with a limited number of companies representing a small number of industries. Additionally, issuers of foreign (non-U.S.) securities are usually not subject to the same degree of regulation as U.S. issuers. Reporting, legal, accounting and auditing standards of foreign (non-U.S.) countries differ, in some cases significantly, from U.S. standards. Global economies and financial markets are becoming increasingly interconnected, and conditions and events in one country, region or financial market may adversely impact issuers in a different country, region or financial market. Foreign (non-U.S.) market trading hours, clearance and settlement procedures, and holiday schedules may limit a Fund’s ability to buy and sell securities. Investments in foreign (non-U.S.) markets may also be adversely affected by governmental actions such as the imposition of capital controls, nationalization of companies or industries,

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expropriation of assets or the imposition of punitive taxes. The governments of certain countries may prohibit or impose substantial restrictions on foreign investing in their capital markets or in certain sectors or industries. In addition, a foreign (non-U.S.) government may limit or cause delay in the convertibility or repatriation of its currency which would adversely affect the U.S. dollar value and/or liquidity of investments denominated in that currency. Certain foreign (non-U.S.) investments may become less liquid in response to market developments or adverse investor perceptions, or become illiquid after purchase by a Fund, particularly during periods of market turmoil. A reduction in trading in securities of issuers located in countries whose economies are heavily dependent upon trading with key partners may have an adverse impact on a Fund’s investments.

Also, nationalization, expropriation or confiscatory taxation, unstable governments, decreased market liquidity, currency blockage, market disruptions, political changes, security suspensions, diplomatic developments or the imposition of sanctions or other similar measures could adversely affect a Fund’s investments in a foreign (non-U.S.) country, and may render holdings in that foreign (non-U.S.) country illiquid or even worthless. In the event of nationalization, expropriation or other confiscation, a Fund could lose its entire investment in foreign (non-U.S.) securities. The type and severity of sanctions and other similar measures, including counter sanctions and other retaliatory actions, that may be imposed could vary broadly in scope, and their impact is difficult to ascertain. These types of measures may include, but are not limited to, banning a sanctioned country or certain persons or entities associated with such country from global payment systems that facilitate cross-border payments, restricting the settlement of securities transactions by certain investors, and freezing the assets of particular countries, entities or persons. The imposition of sanctions and other similar measures could, among other things, result in a decline in the value and/or liquidity of securities issued by the sanctioned country or companies located in or economically tied to the sanctioned country, downgrades in the credit ratings of the sanctioned country's securities or those of companies located in or economically tied to the sanctioned country, currency devaluation or volatility, and increased market volatility and disruption in the sanctioned country and throughout the world. Sanctions and other similar measures could directly or indirectly limit or prevent a Fund from buying and selling securities (in the sanctioned country and other markets), significantly delay or prevent the settlement of securities transactions and adversely impact a Fund's liquidity and performance. Adverse conditions in a certain region can adversely affect securities of other countries whose economies appear to be unrelated. To the extent that a Fund invests a significant portion of its assets in a specific geographic region or in securities denominated in a particular foreign (non-U.S.) currency, the Fund will generally have more exposure to regional economic risks, including weather emergencies and natural disasters, associated with foreign (non-U.S.) investments. Additionally, events and evolving conditions in certain markets or regions may alter the risk profile of investments tied to those markets or regions. This may cause investments tied to such markets or regions to become riskier or more volatile, even when investments in such markets or regions were perceived as comparatively stable historically. Foreign (non-U.S.) securities may also be less liquid (particularly during market closures due to local holidays or other reasons) and more difficult to value than securities of U.S. issuers.

Emerging Markets Risk

Foreign (non-U.S.) investment risk may be particularly high to the extent a Fund invests in emerging market securities. Emerging market securities may present market, credit, currency, liquidity, volatility, legal, political, technical and other risks different from, and potentially greater than, the risks of investing in securities and instruments economically tied to developed foreign countries. To the extent a Fund invests in emerging market securities that are economically tied to a particular region, country or group of countries, the Fund may be more sensitive to adverse political or social events affecting that region, country or group of countries. Economic, business, political, or social instability may affect emerging market securities differently, and often more severely, than developed market securities. A Fund that focuses its investments in multiple asset classes of emerging market securities may have a limited ability to mitigate losses in an environment that is adverse to emerging market securities in general. Emerging market securities may also be more volatile, less liquid (particularly during market closures due to local holidays or other reasons) and more difficult to value than securities economically tied to developed foreign countries. The systems and procedures for trading and settlement of securities in emerging markets are less developed and less transparent and transactions may take longer to settle. Emerging market countries typically have less established regulatory, disclosure, legal, accounting, recordkeeping and financial reporting systems than those in more developed markets, which may increase the potential for market manipulation or reduce the scope or quality of financial information available to investors. Governments in emerging market countries are often less stable and more likely to take extra-legal action with respect to companies, industries, assets, or foreign ownership than those in more developed markets. Moreover, it can be more difficult for investors to bring litigation or enforce judgments, or to obtain information needed to pursue or enforce such judgments, against issuers in emerging markets or for U.S. regulators to bring enforcement actions against such issuers. In addition, foreign companies with securities listed on U.S. exchanges may be delisted if they do not meet U.S. accounting standards and auditor oversight requirements, which may decrease the liquidity and value of the securities. A Fund may also be subject to Emerging Markets Risk if it invests in derivatives or other securities or instruments whose value or return are related to the value or returns of emerging markets securities. Rising interest rates, combined with widening credit spreads, could negatively impact the value of emerging market debt and increase funding costs for foreign issuers. In such a scenario, foreign issuers might not be able to service their debt obligations, the market for emerging market debt could suffer from reduced liquidity, and any investing Fund could lose money. The economy of some emerging markets may be particularly exposed to or affected by a certain industry or sector, and therefore issuers and/or securities of such emerging markets may be more affected by the performance of such industries or sectors.

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Sovereign Debt Risk

Sovereign debt risk is the risk that fixed income instruments issued by sovereign entities may decline in value as a result of default or other adverse credit event resulting from an issuer’s inability or unwillingness to make principal or interest payments in a timely fashion. A sovereign entity’s failure to make timely payments on its debt can result from many factors, including, without limitation, insufficient foreign (non-U.S.) currency reserves or an inability to sufficiently manage fluctuations in relative currency valuations, an inability or unwillingness to satisfy the demands of creditors and/or relevant supranational entities regarding debt service or economic reforms, the size of the debt burden relative to economic output and tax revenues, cash flow difficulties, and other political and social considerations. The risk of loss to a Fund in the event of a sovereign debt default or other adverse credit event is heightened by the unlikelihood of any formal recourse or means to enforce its rights as a holder of the sovereign debt. In addition, sovereign debt restructurings, which may be shaped by entities and factors beyond a Fund’s control, may result in a loss in value of the Fund’s sovereign debt holdings.

Asset-Backed Securities Risk

Asset-backed securities represent interests in assets such as consumer loans or receivables held in trust and often involve risks that are different from or possibly more acute than risks associated with other types of debt instruments. Generally, rising interest rates tend to extend the duration of asset-backed securities, making them more sensitive to changes in interest rates. As a result, in a period of rising interest rates, if the Fund holds asset-backed securities, it may exhibit additional volatility, thereby putting additional downward pressure on the value of these securities and potentially causing the Fund to lose money. This is known as extension risk. Asset-backed securities are subject to credit risk. In addition, asset-backed securities are subject to prepayment risk. When interest rates decline, the issuer of an asset-backed security may pay back the principal of such an obligation sooner than expected. This can reduce the returns of the Fund because the Fund may have to reinvest that money at the lower prevailing interest rates. The Fund’s investments in asset-backed securities are also subject to risks associated with the nature of the assets and the servicing of those assets. Payment of principal and interest on asset-backed securities may be largely dependent upon the cash flows generated by the assets backing the securities, and asset-backed securities may not have the benefit of any security interest in the related assets.

Currency Risk

If a Fund invests directly in foreign (non-U.S.) currencies or in securities that trade in, and receive revenues in, foreign (non-U.S.) currencies, or, in the case of each Fund (except the PIMCO Ultra Short Government Active Exchange-Traded Fund and PIMCO Prime Limited Maturity Active Exchange-Traded Fund), in derivatives or other instruments that provide exposure to foreign (non-U.S.) currencies, it will be subject to the risk that those currencies will decline in value relative to the U.S. dollar, or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged. Although a Fund may attempt to hedge its currency exposure into the U.S. dollar, it may not be successful in reducing the effects of currency fluctuations. A Fund may also hedge from one foreign currency to another. In addition, a Fund’s use of currency hedging may not be successful and the use of such strategies may lower a Fund’s potential returns.

Currency rates in foreign (non-U.S.) countries may fluctuate significantly over short periods of time for a number of reasons, including changes in interest rates, rates of inflation, balance of payments and governmental surpluses or deficits, intervention (or the failure to intervene) by U.S. or foreign (non-U.S.) governments, central banks or supranational entities such as the International Monetary Fund, or by the imposition of currency controls or other political developments in the United States or abroad. As a result, a Fund’s investments in or exposure to foreign (non-U.S.) currencies and/or foreign (non-U.S.) currency-denominated securities may reduce the returns of the Fund.

Currency risk may be particularly high to the extent that a Fund invests in foreign (non-U.S.) currencies or engages in foreign currency transactions that are economically tied to emerging market countries. These currency transactions may present market, credit, currency, liquidity, legal, political and other risks different from, or greater than, the risks of investing in developed foreign (non-U.S.) currencies or engaging in foreign currency transactions that are economically tied to developed foreign countries.

Leveraging Risk

Certain transactions may give rise to a form of leverage. Such transactions may include, among others, reverse repurchase agreements, loans of portfolio securities, and the use of when-issued, delayed delivery or forward commitment transactions. Each Fund's (except the PIMCO Ultra Short Government Active Exchange-Traded Fund and PIMCO Prime Limited Maturity Active Exchange-Traded Fund) use of derivatives may also create leveraging risk. The Subsidiary (as described under “Characteristics and Risks of Securities and Investment Techniques—Investments in the Wholly-Owned Subsidiary”) will comply with requirements of Rule 18f-4 on an aggregate basis with the Fund. The Funds also may be exposed to leveraging risk by borrowing money for investment purposes. Leverage may cause a Fund to liquidate portfolio positions to satisfy its obligations when it may not be advantageous to do so. Leverage, including borrowing, may cause a Fund to be more volatile than if the Fund had not been leveraged. This is because leverage tends to exaggerate the effect of any increase or decrease in the value of a Fund's portfolio securities. Certain types of leveraging transactions, such as short sales that are not “against the box” (i.e., short sales where the Fund does not hold the security or

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have the right to acquire it without payment of further consideration), could theoretically be subject to unlimited losses in cases where a Fund, for any reason, is unable to close out the transaction. In addition, to the extent a Fund borrows money, interest costs on such borrowings may not be recovered by any appreciation of the securities purchased with the borrowed amounts and could exceed the Fund’s investment returns, resulting in greater losses. Moreover, to make payments of interest and other loan costs, a Fund may be forced to sell portfolio securities when it is not otherwise advantageous to do so. When the Fund reduces or discontinues its use of leverage (“deleveraging’), it may be required to sell portfolio securities at inopportune times to repay leverage obligations, which could result in realized losses and a decrease in the Fund's net asset value. Deleveraging involves complex operational processes, including the coordination of asset sales, repayment of debt, and potential restructuring of the Fund's capital and may involve significant costs, including transaction costs associated with the sale of portfolio securities, prepayment penalties on borrowed funds. Leveraging transactions pursued by a Fund may increase its duration and sensitivity to interest rate movements. The Fund may continue to use leverage even if available financing rates are higher than anticipated returns, including, for example, in cases where deleveraging, including any expenses related thereto, might be viewed as detrimental to the Fund’s portfolio.

Management Risk

Each Fund and the Subsidiary are subject to management risk because it is an actively managed investment portfolio. PIMCO and each individual portfolio manager will apply investment techniques and risk analysis and will, in some cases, rely partially or entirely upon or be informed by one or more quantitative models in making investment decisions for the Funds, but there can be no guarantee that these decisions will produce the desired results. There can be no guarantee that these decisions will produce the desired results or that the due diligence conducted by PIMCO, or such other fund’s investment adviser or sub-adviser, as applicable, and individual portfolio managers will evaluate every factor prior to investing in a company or issuer and expose all material risks associated with an investment. Additionally, PIMCO, or such other fund’s investment adviser or sub-adviser, as applicable, and individual portfolio managers may not be able to identify suitable investment opportunities and may face competition from other investment managers when identifying and consummating certain investments. Certain securities or other instruments in which a Fund seeks to invest may not be available in the quantities desired, including in circumstances where other funds for which PIMCO acts as investment adviser, including funds with names, investment objectives and policies, and/or portfolio management teams, similar to the Fund, are seeking to invest in the same or similar securities or instruments. In addition, regulatory restrictions, actual or potential conflicts of interest or other considerations may cause PIMCO to restrict or prohibit participation in certain investments. In such circumstances, PIMCO or the individual portfolio managers may determine to purchase other securities or instruments as substitutes. Such substitute securities or instruments may not perform as intended, which could result in losses to the Fund. To the extent a Fund employs strategies targeting perceived pricing inefficiencies, arbitrage strategies or similar strategies, it is subject to the risk that the pricing or valuation of the securities and instruments involved in such strategies may change unexpectedly, which may result in reduced returns or losses to the Fund. Each Fund is also subject to the risk that deficiencies in the internal systems or controls of PIMCO or another service provider will cause losses for the Fund or hinder Fund operations. For example, trading delays or errors (both human and systematic) could prevent a Fund from purchasing a security expected to appreciate in value. Please refer to “Portfolio Managers – Conflicts of Interest” in the SAI for further information. Additionally, legislative, regulatory, or tax restrictions, policies or developments may affect the investment techniques available to PIMCO and each individual portfolio manager in connection with managing the Funds and may also adversely affect the ability of the Funds to achieve their investment objectives. There also can be no assurance that all of the personnel of PIMCO will continue to be associated with PIMCO for any length of time. The loss of services of one or more key employees of PIMCO could have an adverse impact on the Fund’s ability to realize its investment objective.

California State-Specific Risk

A Fund that concentrates its investments in California Municipal Bonds may be affected significantly by economic, regulatory, social, environmental or public health developments affecting the ability of California tax-exempt issuers to pay interest or repay principal. Certain issuers of California Municipal Bonds have experienced serious financial difficulties in the past and reoccurrence of these difficulties may impair the ability of certain California issuers to pay principal or interest on their obligations. Provisions of the California Constitution and State statutes that limit the taxing and spending authority of California governmental entities may impair the ability of California issuers to pay principal and/or interest on their obligations. While California’s economy is broad, it does have major concentrations in advanced technology, aerospace and defense-related manufacturing, trade, entertainment, real estate and financial services, and may be sensitive to economic problems affecting those industries, particularly given large budget deficits that have been identified and may continue. Future California political and economic developments, constitutional amendments, legislative measures, executive orders, administrative regulations, litigation and voter initiatives as well as environmental events, natural disasters, pandemics, epidemics or social unrest could have an adverse effect on the debt obligations of California issuers.

New York State-Specific Risk

A Fund that concentrates its investments in New York Municipal Bonds may be affected significantly by economic, regulatory or political developments affecting the ability of New York issuers to pay interest or repay principal. Certain issuers of New York Municipal Bonds have experienced serious financial difficulties in the past and reoccurrence of these difficulties may impair the ability of certain New York issuers to pay

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principal or interest on their obligations. Provisions of the New York Constitution and State statutes which limit the taxing and spending authority of New York governmental entities may impair the ability of New York issuers to pay principal and/or interest on their obligations. While New York’s economy is broad, it does have major concentrations in certain industries, such as financial services, and may be sensitive to economic problems affecting those industries. Future New York political and economic developments, constitutional amendments, legislative measures, executive orders, administrative regulations, litigation and voter initiatives as well as environmental events, natural disasters, pandemics, epidemics or social unrest could have an adverse effect on the debt obligations of New York issuers to pay principal or interest on their obligations. The financial health of New York City affects that of the State, and when New York City experiences financial difficulty it may have an adverse affect on New York Municipal Bonds held by such Fund. The growth rate of New York has at times been somewhat slower than the nation overall. The economic and financial condition of New York also may be affected by various financial, social, economic and political factors.

Puerto Rico-Specific Risk

A Fund that invests in Municipal Bonds issued by Puerto Rico or its instrumentalities may be affected by certain developments, such as political, economic, environmental, social, regulatory or debt restructuring developments, that impact the ability or obligation of Puerto Rico municipal issuers to pay interest or repay principal. Certain issuers of Puerto Rico Municipal Bonds have experienced significant financial difficulties and the continuation or reoccurrence of these difficulties may impair their ability to pay principal or interest on their obligations. Provisions of the Puerto Rico Constitution and Commonwealth laws, including a federally-appointed oversight board to oversee the Commonwealth’s financial operations, which limit the taxing and spending authority of Puerto Rico governmental entities, may impair the ability of Puerto Rico issuers to pay principal and/or interest on their obligations. Puerto Rico’s economy has sizable concentrations in certain industries, such as the manufacturing and service industries, and may be sensitive to economic problems affecting those industries. Future Puerto Rico-related developments, such as political and economic developments, constitutional amendments, legislative measures, executive orders, administrative regulations, litigation, debt restructuring, and voter initiatives as well as environmental events, natural disasters, pandemics, epidemics or social unrest could have an adverse effect on the debt obligations of Puerto Rico issuers.

AMT Bonds Risk

To the extent that a Fund may invest in “AMT Bonds,” which are municipal securities that pay interest that is taxable under the federal alternative minimum tax applicable to noncorporate taxpayers, such investments may expose the Fund to certain risks in addition to those typically associated with municipal bonds. Interest or principal on AMT Bonds paid out of current or anticipated revenues from a specific project or specific asset may be adversely impacted by declines in revenue from the project or asset. Declines in general business activity could also affect the economic viability of facilities that are the sole source of revenue to support AMT Bonds. In this regard, AMT Bonds may entail greater risks than general obligation municipal bonds. For shareholders subject to the federal alternative minimum tax, a portion of the Fund’s distributions may not be exempt from gross federal income, which may give rise to alternative minimum tax liability.

Municipal Project-Specific Risk

A Fund may be more sensitive to adverse economic, business or political developments if it invests a substantial portion of its assets in the bonds of specific projects (such as those relating to education, health care, housing, transportation, and utilities), industrial development bonds, or in general obligation bonds, particularly if there is a large concentration from issuers in a single state. This is because the value of municipal securities can be significantly affected by the political, economic, legal, and legislative realities of the particular issuer’s locality or municipal sector events. In addition, a significant restructuring of federal income tax rates or even serious discussion on the topic in Congress could cause municipal bond prices to fall. The demand for municipal securities is strongly influenced by the value of tax-exempt income to investors. Lower income tax rates could reduce the advantage of owning municipal securities. Similarly, changes to state or federal regulation tied to a specific sector, such as the hospital sector, could have an impact on the revenue stream for a given subset of the market.

Municipal securities are also subject to interest rate, credit, and liquidity risk.

Interest Rate Risk. The value of municipal securities, similar to other fixed income securities, will likely drop as interest rates rise in the general market. Conversely, when rates decline, bond prices generally rise.

Credit Risk. The risk that a borrower may be unable to make interest or principal payments when they are due. Funds that invest in municipal securities rely on the ability of the issuer to service its debt. This subjects a Fund to credit risk in that the municipal issuer may be fiscally unstable or exposed to large liabilities that could impair its ability to honor its obligations. Municipal issuers with significant debt service requirements, in the near-to mid-term; unrated issuers and those with less capital and liquidity to absorb additional expenses may be most at risk. A Fund that invests in lower quality or high yield municipal securities may be more sensitive to the adverse credit events in the municipal market. The treatment of municipalities in bankruptcy is more uncertain, and potentially more adverse to debt holders, than for corporate issues.

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Liquidity Risk. The risk that investors may have difficulty finding a buyer when they seek to sell, and therefore, may be forced to sell at a discount to the market value. Liquidity may sometimes be impaired in the municipal market and Funds that primarily invest in municipal securities may find it difficult to purchase or sell such securities at opportune times. Liquidity can be impaired due to interest rate concerns, credit events, or general supply and demand imbalances. These adverse developments sometimes cause a Fund to endure higher redemption rates. Depending on the particular issuer and current economic conditions, municipal securities could be deemed more volatile investments.

In addition to general municipal market risks, different municipal sectors may face different risks. For instance, general obligation bonds are secured by the full faith, credit, and taxing power of the municipality issuing the obligation. As such, timely payment depends on the municipality’s ability to raise tax revenue and maintain a fiscally sound budget. The timely payments may also be influenced by any unfunded pension liabilities or other post- employee benefit plan (“OPEB”) liabilities.

Revenue bonds are secured by special tax revenues or other revenue sources. If the specified revenues do not materialize, then the bonds may not be repaid.

Private activity bonds are yet another type of municipal security. Municipalities use private activity bonds to finance the development of industrial facilities for use by private enterprise. Principal and interest payments are to be made by the private enterprise benefitting from the development, which means that the holder of the bond is exposed to the risk that the private issuer may default on the bond.

Moral obligation bonds are usually issued by special purpose public entities. If the public entity defaults, repayment becomes a “moral obligation” instead of a legal one. The lack of a legally enforceable right to payment in the event of default poses a special risk for a holder of the bond because it has little or no ability to seek recourse in the event of default.

Municipal notes are similar to general municipal debt obligations, but they generally possess shorter terms. Municipal notes can be used to provide interim financing and may not be repaid if anticipated revenues are not realized.

Futures Contract Risk

A futures contract is an exchange-traded contract to buy or sell an underlying asset, such as a security, currency or commodity, for a set price on a future date. The risks associated with the Fund’s use of derivative instruments, including futures contracts, are discussed in more detail under “Characteristics and Risks of Securities and Investment Techniques— Derivatives” in this prospectus and under “Investment Objectives and Policies” in the SAI. The purchase or sale of a futures contract may result in losses in excess of the amount invested in the futures contract. There can be no guarantee that there will be a correlation between price movements in the futures contract and the underlying asset. In addition, there are significant differences between the futures market and the markets for underlying assets, which could result in an imperfect correlation between the markets. The degree of imperfect correlation depends on circumstances such as variations in speculative market demand for futures and futures options on underlying assets, including technical influences in futures trading and futures options, and differences between the futures contract and underlying asset due to factors such as interest rate levels, maturities, and creditworthiness of issuers.

Futures contracts are traded on exchanges, so that, in most cases, a party can close out its position on the exchange for cash, without delivering the underlying asset. Because the futures utilized by the Fund are exchange-traded, the primary credit risk on futures contracts resides with the Fund’s clearing broker or the clearinghouse. Changes in regulation relating to a registered fund’s use of derivatives and related instruments could potentially limit or impact the Fund’s ability to invest in derivatives, limit the Fund’s ability to employ certain strategies that use derivatives and/or adversely affect the value of derivatives and the Fund’s performance. Futures exchanges may limit the amount of fluctuation permitted in certain futures contract prices during a single trading day. There can be no assurance that a liquid market will exist at a time when the Fund seeks to close out a futures or a futures option position, and that the Fund would remain obligated to meet margin requirements until the position is closed.

In addition, certain futures contracts may be relatively new instruments without a significant trading history. As a result, there can be no assurance that an active secondary market will develop or continue to exist.

Short Exposure Risk

A Fund’s short sales and short positions, if any, are subject to special risks. A short sale involves the sale by the Fund of a security that it does not own with the hope of purchasing the same security at a later date at a lower price. A Fund may also enter into a short position through a forward commitment or, in the case of each Fund (except the PIMCO Ultra Short Government Active Exchange-Traded Fund and PIMCO Prime Limited Maturity Active Exchange-Traded Fund), a short derivative position through a futures contract or, except the PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund and PIMCO Enhanced Short Maturity Active Exchange-Traded Fund, swap agreement. If the price of the security or derivative has increased during this time, then the Fund will incur a loss equal to the increase in price from the time that the short sale was entered into plus any transaction costs (i.e., premiums and interest) paid to the broker-dealer to borrow securities. Therefore, short sales involve the risk that losses may be exaggerated, potentially losing more money than the actual cost of the investment. By contrast, a loss on a long position arises from decreases in the value of the security and is limited by the fact that a security’s value cannot decrease below zero.

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By investing the proceeds received from selling securities short, a Fund could be deemed to be employing a form of leverage, which creates special risks. The use of leverage may increase a Fund’s exposure to long security positions and make any change in the Fund’s NAV greater than it would be without the use of leverage. This could result in increased volatility of returns. There is no guarantee that any leveraging strategy a Fund employs will be successful during any period in which it is employed.

In times of unusual or adverse market, economic, environmental, regulatory or political conditions, a Fund may not be able, fully or partially, to implement its short selling strategy. Periods of unusual or adverse market, economic, environmental, regulatory or political conditions generally may exist for as long as six months and, in some cases, much longer. In response to market events, the SEC and regulatory authorities in other jurisdictions may adopt (and in certain cases, have adopted) bans on, and/or reporting requirements for, short sales of certain securities, including short positions on such securities acquired through swaps. Also, there is the risk that the third party to the short sale or short position will not fulfill its contractual obligations, causing a loss to the Fund.

Contingent Convertible Securities Risk

Contingent convertible securities (“CoCos”) have no stated maturity, have fully discretionary coupons and are typically issued in the form of subordinated debt instruments. CoCos generally either convert into equity or have their principal written down (including potentially to zero) upon the occurrence of certain triggering events (“triggers”) linked to regulatory capital thresholds or regulatory actions relating to the issuer’s continued viability. As a result, an investment by the Fund in CoCos is subject to the risk that coupon (i.e., interest) payments may be cancelled by the issuer or a regulatory authority in order to help the issuer absorb losses and the risk of total loss. If such an event occurs, an investor may not have any rights to repayment of the principal amount of the securities. Additionally, an investor may not be able to collect interest payments or dividends on such securities. An investment by the Fund in CoCos is also subject to the risk that, in the event of the liquidation, dissolution or winding-up of an issuer prior to a trigger event, the Fund’s rights and claims will generally rank junior to the claims of holders of the issuer’s other debt obligations and CoCos may also be treated as junior to an issuer’s other obligations and securities. In addition, if CoCos held by the Fund are converted into the issuer’s underlying equity securities following a trigger event, the Fund’s holding may be further subordinated due to the conversion from a debt to equity instrument. In certain circumstances, the principal of CoCos may be written down to zero even when the underlying equity may retain value. Further, the value of an investment in CoCos is unpredictable and will be influenced by many factors and risks, including interest rate risk, credit risk, market risk and liquidity risk. An investment by the Fund in CoCos may result in losses to the Fund.

Convertible Securities Risk

Convertible securities are fixed income securities, preferred securities or other securities that are convertible into or exercisable for common stock of the issuer (or cash or securities of equivalent value) at either a stated price or a stated rate. Convertible debt securities pay interest and convertible preferred stocks pay dividends until they mature or are converted, exchanged or redeemed. The market values of convertible securities may decline as interest rates increase and, conversely, may increase as interest rates decline. A convertible security’s market value, however, tends to reflect the market price of the common stock of the issuing company when that stock price approaches or is greater than the convertible security’s “conversion price.” The conversion price is defined as the predetermined price at which the convertible security could be exchanged for the associated stock. Certain types of convertible securities may decline in value or lose their value entirely in the event the issuer’s financial condition becomes significantly impaired. As the market price of the underlying common stock declines, the price of the convertible security tends to be influenced more by the yield of the convertible security. Thus, it may not decline in price to the same extent as the underlying common stock. In the event of a liquidation of the issuing company, holders of convertible securities may be paid before the company’s common stockholders but after holders of any senior debt obligations of the company. Consequently, the issuer’s convertible securities generally entail less risk than its common stock but more risk than its debt obligations.

Synthetic convertible securities involve the combination of separate securities that possess the two principal characteristics of a traditional convertible security (i.e., an income-producing component and a right to acquire an equity security). Synthetic convertible securities are often achieved, in part, through investments in warrants or options to buy common stock (or options on a stock index), and therefore are subject to the risks associated with derivatives. The value of a synthetic convertible security will respond differently to market fluctuations than a traditional convertible security because a synthetic convertible is composed of two or more separate securities or instruments, each with its own market value. Because the convertible component is typically achieved by investing in warrants or options to buy common stock at a certain exercise price, or options on a stock index, synthetic convertible securities are subject to the risks associated with derivatives. In addition, if the value of the underlying common stock or the level of the index involved in the convertible component falls below the exercise price of the warrant or option, the warrant or option may lose all value.

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Tax Risk

The PIMCO Commodity Strategy Active Exchange-Traded Fund gains exposure to the commodities markets through investments in commodity-linked derivative instruments, including commodity index-linked notes, swap agreements, commodity options, futures, and options on futures and through direct investments in commodities. The Fund may also gain exposure indirectly to commodity markets by investing in its respective Subsidiary, which invests primarily in commodity-linked derivative instruments backed by a portfolio of inflation-indexed securities and/or other Fixed Income Instruments. In order for the Fund to qualify as a regulated investment company under Subchapter M of the Code, the Fund must derive at least 90 percent of its gross income each taxable year from certain qualifying sources of income.

As more fully described below under “Tax Consequences—A Note on the PIMCO Commodity Strategy Active Exchange-Traded Fund“ the Internal Revenue Service (“IRS”) issued a revenue ruling which holds that income derived from commodity-linked derivatives, if earned directly by the Fund, is not qualifying income under Subchapter M of the Code. The IRS has issued private letter rulings in which the IRS specifically concluded that income derived from an investment in a subsidiary that provides commodity-linked exposure through its investments will constitute qualifying income. Under IRS regulations, income derived from a controlled foreign corporation will be considered qualifying income if distributed to the Fund or if the Fund’s income from the subsidiary is derived with respect to the Fund’s business of investing in securities. An IRS revenue procedure states that the IRS will not in the future issue private letter rulings that would require a determination of whether an asset (such as a commodity index-linked note) is a “security” under the Investment Company Act of 1940, as amended (the “1940 Act”).

The Fund will seek to gain exposure to the commodities markets primarily through investments in its respective Subsidiary. If the IRS were to determine that income derived from certain commodity-linked notes or from investments in a Subsidiary does not constitute qualifying income, the Fund might be adversely affected and would be required to reduce their exposure to such investments, which might result in difficulty in implementing their investment strategies and increased costs and taxes. Investment in a Subsidiary involves specific risks. See “Characteristics and Risks of Securities and Investment Techniques—Investments in Wholly-Owned Subsidiary” below for further information regarding the Subsidiary, including the risks associated with investing in the Subsidiary.

Subsidiary Risk

By investing in the Subsidiary, the PIMCO Commodity Strategy Active Exchange-Traded Fund is indirectly exposed to the risks associated with the Subsidiary’s investments. The investments held by the Subsidiary are generally similiar to those that are permitted to be held by the Fund and are subject to the same risks that apply to similar investments if held directly by the Fund. These risks are described elsewhere in this prospectus. There can be no assurance that the investment objective of the Fund or the Subsidiary will be achieved. The Subsidiary is not registered under the Investment Company Act of 1940, as amended (the “1940 Act”), and, unless otherwise noted in this prospectus, is not subject to all the investor protections of the 1940 Act. In addition, changes in the laws of the United States and/or the Cayman Islands could result in the inability of the Fund and/or the Subsidiary to operate as described in this prospectus and the SAI and could adversely affect the Fund. Changes in the laws of the United States and/or the Cayman Islands could adversely affect the performance of the Fund and/or the Subsidiary and result in the Fund underperforming its benchmark index.

Tax-Efficient Investing Risk

A Fund may engage in investment strategies intended to manage capital gain distributions. For example, a Fund may attempt to use losses from sales of securities that have declined to offset future gains that would otherwise be taxable. Any such strategy may be unsuccessful or only partially successful, and investors may experience adverse tax effects, including, but not limited to potentially greater tax liability than other PIMCO-advised funds. Additionally, such strategies may reduce investment returns or result in investment losses, which could cause the Fund and investors to lose money. Further, a Fund’s focus on income generation may result in a higher overall tax liability as income may be taxed at a higher rate than capital gains.

Distribution Rate Risk

Although a Fund may seek to maintain a level distribution rate, the Fund’s distribution rate may be affected by numerous factors, including but not limited to changes in realized and projected market returns, fluctuations in market interest rates, Fund performance and other factors. For instance, during periods of low or declining interest rates, the Fund’s distributable income and dividend levels may decline for many reasons. There can be no assurance that a change in market conditions or other factors will not result in a change in the Fund’s distribution rate or that the rate will be sustainable in the future.

Environmental, Social and Governance Risk

A Fund’s Environmental, Social and Governance (“ESG”) investing strategy, which may select or typically exclude securities of certain issuers for reasons in addition to performance, carries the risk that the Fund’s performance may differ from funds that do not utilize an ESG investing strategy. For example, the application of this strategy could affect the Fund’s exposure to certain sectors or types of investments, which could

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negatively impact the Fund’s performance. ESG investing is qualitative and subjective by nature, and there is no guarantee that the factors utilized by PIMCO or any judgment exercised by PIMCO will reflect the opinions of any particular investor, and the factors utilized by PIMCO may differ from the factors that any particular investor considers relevant in evaluating an issuer’s ESG practices. PIMCO’s assessment of a company's practices and processes relating to ESG investing may also change, including in response to legal and regulatory developments relevant to sustainable and/or ESG investing. In addition, the Fund may have fewer investment opportunities available to it than it would have if it did not take into account ESG characteristics of investments, which may cause the Fund to underperform. In evaluating an issuer, PIMCO is dependent upon information and data obtained through voluntary or third-party reporting that may be incomplete, inaccurate or unavailable, or present conflicting information and data with respect to an issuer, which in each case could cause PIMCO to incorrectly assess an issuer’s business practices with respect to its ESG practices. PIMCO’s engagement practices are conducted on a firm-wide basis and would be expected to focus on ESG practices that have the potential to enhance risk-adjusted returns. Socially responsible norms differ by region, and an issuer’s ESG practices or PIMCO’s assessment of an issuer’s ESG practices may change over time. PIMCO’s ESG process seeks to exclude investments that are misaligned with certain sustainability principles, as determined by PIMCO’s internal criteria. The Fund may invest in securities of issuers whose ESG practices are weaker relative to certain peers or industry benchmarks with the expectation that these practices may improve over time. It may also exclude those issuers that are not receptive to pursuing improvement in certain ESG practices, as determined in PIMCO’s sole discretion. Successful application of the Fund’s ESG investing strategy and PIMCO’s engagement efforts will depend on PIMCO’s skill in properly identifying and analyzing material ESG issues, and there can be no assurance that the strategy or techniques employed will be successful. Regulation of ESG investing in the U.S. and abroad is evolving. Future regulatory developments in the U.S. and abroad which seek to regulate ESG investing approaches and/or associated disclosures may impact or otherwise influence the ESG investing strategies utilized by PIMCO in the future. The Fund’s investments in certain issuers may be susceptible to various factors that may impact their businesses or operations, including costs associated with government budgetary constraints that impact publicly funded projects and initiatives, the effects of general economic conditions throughout the world, increased competition from other providers of services, unfavorable tax laws or accounting policies and high leverage. Past performance is not a guarantee or reliable indicator of future results.

LIBOR Transition Risk

Certain instruments in which a Fund may invest may reference the London Interbank Offered Rate (“LIBOR”). LIBOR was traditionally an average interest rate, determined by the ICE Benchmark Administration, that banks charge one another for the use of short-term money. On March 5, 2021, the Financial Conduct Authority (“FCA”), the United Kingdom’s financial regulatory body and regulator of LIBOR, publicly announced that all U.S. Dollar LIBOR settings will either cease to be provided by any administrator or will no longer be representative (i) immediately after December 31, 2021 for one-week and two-month U.S. Dollar LIBOR settings and (ii) immediately after June 30, 2023 for the remaining U.S. Dollar LIBOR settings. As of January 1, 2022, as a result of supervisory guidance from U.S. regulators, U.S. regulated entities have generally ceased entering into new LIBOR contracts with limited exceptions. Publication of all Japanese yen and the one- and six-month sterling LIBOR settings have ceased, and while publication of the three-month Sterling LIBOR setting will continue through at least the end of March 2024 on the basis of a changed methodology (known as “synthetic LIBOR”), this rate has been designated by the FCA as unrepresentative of the underlying market that it seeks to measure and is solely available for use in legacy transactions. As a result of benchmark reforms, publication of all LIBOR settings has ceased. Certain bank-sponsored committees in other jurisdictions, including Europe, the United Kingdom, Japan and Switzerland, have selected alternative reference rates denominated in other currencies. Although LIBOR is no longer published, there are potential effects related to the transition away from LIBOR or the prior use of LIBOR on a Fund, or on certain instruments in which a Fund invests, which can be difficult to ascertain, and may vary depending on factors that include, but are not limited to: (i) existing fallback or termination provisions in individual contracts and (ii) whether, how, and when industry participants adopt new reference rates for affected instruments. So-called “tough legacy” contracts have LIBOR interest rate provisions with no fallback provisions contemplating a permanent discontinuation of LIBOR, inadequate fallback provisions or fallback provisions which may not effectively result in a transition away from LIBOR prior to LIBOR’s planned replacement date. On March 15, 2022, the Adjustable Interest Rate (LIBOR) Act was signed into law. This law provides a statutory fallback mechanism on a nationwide basis to replace LIBOR with a benchmark rate that is selected by the Board of Governors of the Federal Reserve System based on the Secured Overnight Financing Rate (“SOFR”) for tough legacy contracts. On February 27, 2023, the Federal Reserve System’s final rule in connection with this law became effective, establishing benchmark replacements based on SOFR and Term SOFR (a forward-looking measurement of market expectations of SOFR implied from certain derivatives markets) for applicable tough legacy contracts governed by U.S. law. In addition, the FCA required the publication of synthetic LIBOR for the one-month, three-month and six-month U.S. Dollar LIBOR until September 30, 2024. Certain of a Fund’s investments may have involved individual tough legacy contracts which may be subject to the Adjustable Interest Rate (LIBOR) Act or were subject to synthetic LIBOR and no assurances can be given that these measures have had the intended effects. Moreover, certain aspects of the transition from LIBOR have relied or will continue to rely on the actions of third-party market participants, such as clearing houses, trustees, administrative agents, asset servicers and certain service providers; PIMCO cannot guarantee the performance of such market participants and any failure on the part of such market participants to manage their part of the LIBOR transition could impact a Fund. The transition of investments from LIBOR to a replacement rate as a result of amendment, application of existing fallbacks, statutory requirements or otherwise may also result in a reduction in the value of certain instruments held by a Fund or a reduction

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Prospectus

Management of the Funds

Investment Manager

PIMCO serves as the investment manager for the Funds. Subject to the supervision of the Board of Trustees, PIMCO is responsible for managing the investment activities of the Funds and the Funds' business affairs and other administrative matters. PIMCO also serves as the investment manager for the Subsidiary.

PIMCO is located at 650 Newport Center Drive, Newport Beach, CA 92660. Organized in 1971, PIMCO provides investment management and advisory services to private accounts of institutional and individual clients and to mutual funds. As of September 30, 2024, PIMCO had approximately $2.01 trillion in assets under management.

Management Fees

Each Fund pays for the advisory and supervisory and administrative services it requires under what is essentially an all-in fee structure. For the fiscal year ended June 30, 2024, the Funds paid monthly Management Fees to PIMCO at the following annual rates (stated as a percentage of the average daily net assets of the Fund taken separately):

Fund Name	Management Fees(1)
PIMCO Active Bond Exchange-Traded Fund	0.55%
PIMCO Enhanced Low Duration Active Exchange-Traded Fund	0.46%
PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund	0.36%
PIMCO Enhanced Short Maturity Active Exchange-Traded Fund	0.35%
PIMCO Intermediate Municipal Bond Active Exchange-Traded Fund	0.35%
PIMCO Multisector Bond Active Exchange-Traded Fund	0.65%
PIMCO Municipal Income Opportunities Active Exchange-Traded Fund	0.49%
PIMCO Preferred and Capital Securities Active Exchange-Traded Fund	0.84%
PIMCO Senior Loan Active Exchange-Traded Fund	0.70%
PIMCO Short Term Municipal Bond Active Exchange-Traded Fund	0.35%
PIMCO Ultra Short Government Active Exchange-Traded Fund	0.14%
PIMCO Commodity Strategy Active Exchange-Traded Fund	0.79%

For details regarding changes to this rate within the last 5 years, please see the footnote disclosures for the Funds in the Financial Highlights section beginning on page 102.

The PIMCO Prime Limited Maturity Active Exchange-Traded Fund was not operational during the fiscal year ended June 30, 2024. The management fees for the PIMCO Prime Limited Maturity Active Exchange-Traded Fund are at the annual rate (stated as a percentage of the average daily net assets of the Fund taken separately) of 0.25%.

In addition to providing investment advisory services, PIMCO provides or procures supervisory and administrative services for shareholders and also bears the costs of various third-party services required by the Funds, including audit, custodial, portfolio accounting, legal, transfer agency and printing costs. The Funds bear other expenses which are not covered under the management fee which may vary and affect the total level of expenses paid by shareholders, such as taxes and governmental fees, brokerage fees, commissions and other transaction expenses, organizational and offering expenses of the Trust and the Fund, and any other expenses which are capitalized in accordance with generally accepted accounting principals, costs of borrowing money, including interest expenses, securities lending expenses, extraordinary expenses (such as litigation and indemnification expenses) and fees and expenses of the Trust’s Independent Trustees and their counsel. PIMCO generally earns a profit on the management fee paid by the Funds. Also, under the terms of the investment management agreement, PIMCO, and not Fund shareholders, would benefit from any price decreases in third-party services, including decreases resulting from an increase in net assets.

A discussion of the basis for the Board of Trustees’ approval of the Funds’ investment management agreement is available in the Funds’ Form N-CSR filed with the SEC to shareholders for the fiscal half-year ended December 31, 2023. As discussed in the “Principal Investments and Strategies” section, the PIMCO Commodity Strategy Active Exchange-Traded Fund may pursue its investment objective by investing in the Subsidiary. The Subsidiary has entered into a separate contract with PIMCO whereby PIMCO provides investment advisory and other services to the Subsidiary. In consideration of these services, the Subsidiary pays PIMCO a management fee at the annual rate of 0.69%. PIMCO has contractually agreed to waive the management fee it receives from the PIMCO Commodity Strategy Active Exchange-Traded Fund in an amount equal to the management fee paid to PIMCO by the Subsidiary.

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PIMCO ETF Trust

Expense Limitation Agreement

PIMCO has contractually agreed, through October 31, 2025, to waive a portion of each Fund’s Management Fee, or reimburse the Fund, to the extent that the Fund’s organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata share of Trustee fees exceed 0.0049% (the “Expense Limit”) (calculated as a percentage of the Fund’s average daily net assets). The Expense Limitation Agreement will automatically renew for one-year terms unless PIMCO provides written notice to the Trust at least 30 days prior to the end of the then current term. In any month in which the investment management agreement is in effect, PIMCO is entitled to reimbursement by each Fund of any portion of the Management Fee waived or reimbursed as set forth above (the “Reimbursement Amount”) within thirty-six months of the time of the waiver, provided that such amount paid to PIMCO will not: 1) together with any organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustee fees, exceed, for such month, the Expense Limit (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit); 2) exceed the total Reimbursement Amount; or 3) include any amounts previously reimbursed to PIMCO.

Fee Waiver Agreements

PIMCO has contractually agreed, through October 31, 2025, to waive or reduce its Management Fee in an amount equivalent to the PIMCO Active Bond Exchange-Traded Fund’s expenses or costs attributable to the Securities and Exchange Commission’s (“SEC”) investigation and related settlement proceedings identified in Investment Advisers Act of 1940 Release No. 4577, dated December 1, 2016. This arrangement renews annually for a full year unless terminated by PIMCO upon at least 30 days’ notice prior to the end of the contract term. PIMCO may not recoup these waivers or reductions. The contractual agreement described in the preceding three sentences (the “BOND Agreement”) amends and restates a prior contractual agreement (the “Prior Agreement”) under which PIMCO agreed to waive or reduce its Management Fee payable by the Fund subject to certain conditions. While recoupment was permitted under the Prior Agreement, the BOND Agreement requires PIMCO to reimburse the Fund for any amounts previously recouped by PIMCO pursuant to the Prior Agreement.

PIMCO has contractually agreed, through October 31, 2025, to waive or reduce its Management Fee by 0.12% of the average daily net assets of the PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund. This waiver will automatically renew for one-year terms unless PIMCO provides written notice to the Trust at least 30 days prior to the end of the then current term. In any month in which the investment management agreement is in effect, PIMCO is entitled to reimbursement by the Fund of any portion of the Management Fee waived as set forth above (the “Fee Waiver Reimbursement Amount”) within thirty-six months of the time of the waiver, provided that such amount paid to PIMCO will not: 1) together with any recoupment of organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustee fees pursuant to the Expense Limitation Agreement, exceed the Expense Limit (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit); 2) exceed the total Fee Waiver Reimbursement Amount; or 3) include any amounts previously reimbursed to PIMCO.

PIMCO has contractually agreed, through October 31, 2025, to waive or reduce its Management Fee by 0.10% of the average daily net assets of the PIMCO Municipal Income Opportunities Active Exchange-Traded Fund. This waiver will automatically renew for one-year terms unless PIMCO provides written notice to the Trust at least 30 days prior to the end of the then current term. In any month in which the investment management agreement is in effect, PIMCO is entitled to reimbursement by the Fund of any portion of the management fee waived as set forth above (the “Fee Waiver Reimbursement Amount”) within thirty-six months of the time of the waiver, provided that such amount paid to PIMCO will not: 1) together with any recoupment of organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustee fees pursuant to the Expense Limitation Agreement, exceed the Expense Limit (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit); 2) exceed the total Fee Waiver Reimbursement Amount; or 3) include any amounts previously reimbursed to PIMCO.

PIMCO has contractually agreed, through October 31, 2025, to reduce its Management Fee by 0.10% of the average daily net assets of the PIMCO Senior Loan Active Exchange-Traded Fund. In any month in which the investment management agreement is in effect, PIMCO is entitled to reimbursement by the Fund of any portion of the Management Fee waived as set forth above (the “Fee Waiver Reimbursement Amount”) within thirty-six months of the time of the waiver, provided that such amount paid to PIMCO will not: 1) together with any recoupment of organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustee fees pursuant to the Expense Limitation Agreement, exceed the Expense Limit (calculated as a percentage of average daily net assets) (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit); 2) exceed the total Fee Waiver Reimbursement Amount; or 3) include any amounts previously reimbursed to PIMCO.

PIMCO has contractually agreed, through October 31, 2025, to waive or reduce its management fee by 0.15% of the average daily net assets of the PIMCO Preferred and Capital Securities Active Exchange-Traded Fund. This waiver will automatically renew for one-year terms unless PIMCO provides written notice to the Trust at least 30 days prior to the end of the then current term. In any month in which the investment management agreement is in effect, PIMCO is entitled to reimbursement by the Fund of any portion of the management fee waived as set forth above (the “Fee Waiver Reimbursement Amount”) within thirty-six months of the time of the waiver, provided that such amount paid to PIMCO will not: 1) together with any

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recoupment of organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustee fees pursuant to the Expense Limitation Agreement, exceed the Expense Limit (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit); 2) exceed the total Fee Waiver Reimbursement Amount; or 3) include any amounts previously reimbursed to PIMCO.

PIMCO has contractually agreed, through October 31, 2025, to waive or reduce its management fee by 0.15% of the average daily net assets of the PIMCO Commodity Strategy Active Exchange-Traded Fund. This waiver will automatically renew for one-year terms unless PIMCO provides written notice to the Trust at least 30 days prior to the end of the then current term. In any month in which the investment management agreement is in effect, PIMCO is entitled to reimbursement by the Fund of any portion of the management fee waived as set forth above (the “Fee Waiver Reimbursement Amount”) within thirty-six months of the time of the waiver, provided that such amount paid to PIMCO will not: 1) together with any recoupment of organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustee fees pursuant to the Expense Limitation Agreement, exceed the Expense Limit (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit); 2) exceed the total Fee Waiver Reimbursement Amount; or 3) include any amounts previously reimbursed to PIMCO.

PIMCO has contractually agreed, through October 31, 2025, to waive or reduce its management fee by 0.10% of the average daily net assets of the PIMCO Multisector Bond Active Exchange-Traded Fund. In any month in which the investment management agreement is in effect, PIMCO is entitled to reimbursement by the Fund of any portion of the management fee waived as set forth above (the “Fee Waiver Reimbursement Amount”) within thirty-six months of the time of the waiver, provided that such amount paid to PIMCO will not: 1) together with any recoupment of organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustee fees pursuant to the Expense Limitation Agreement, exceed the Expense Limit (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit); 2) exceed the total Fee Waiver Reimbursement Amount; or 3) include any amounts previously reimbursed to PIMCO.

The PIMCO Active Bond Exchange-Traded Fund, PIMCO Multisector Bond Active Exchange-Traded Fund, PIMCO Commodity Strategy Active Exchange-Traded Fund, PIMCO Preferred and Capital Securities Active Exchange Traded Fund, PIMCO Senior Loan Active Exchange-Traded Fund, PIMCO Intermediate Municipal Bond Active Exchange-Traded Fund, PIMCO Short Term Municipal Bond Active Exchange-Traded Fund and PIMCO Municipal Income Opportunities Active Exchange-Traded Fund (each, an “Investing Fund”) anticipates that it may invest in other series of the Trust, series of PIMCO Funds, and series of PIMCO Equity Series (each series, an “Underlying Fund,” and collectively, the “Underlying Funds”). Each Investing Fund pays a management fee directly to PIMCO at the annual rate stated above, based on the average daily net assets of the Investing Fund. Each Investing Fund also indirectly pays its proportionate share of the advisory fees, supervisory and administrative fees and management fees charged by PIMCO to the Underlying Funds in which the Fund invests (collectively, the “Underlying PIMCO Fund Fees”). With respect to each Investing Fund, PIMCO has contractually agreed, through October 31, 2025, to waive the management fee it receives from the Investing Fund in an amount equal to the actual amount Underlying PIMCO Fund Fees indirectly incurred by the Investing Fund in connection with its investments in Underlying Funds up to a maximum waived amount that is equal to the Investing Fund’s aggregate management fee. This waiver will automatically renew for one-year terms unless PIMCO provides written notice to the Trust at least 30 days prior to the end of the then current term.

Temporary Fee Waivers, Reductions and Reimbursements

To maintain certain net yields for the PIMCO Ultra Short Government Active Exchange-Traded Fund and PIMCO Prime Limited Maturity Active Exchange-Traded Fund, PIMCO and certain affiliates have entered into a fee and expense limitation agreement with such Funds (the “Agreement”) pursuant to which PIMCO or its affiliates may, to the extent permitted by applicable law, temporarily and voluntarily waive, reduce or reimburse all or any portion of : (i) first, any distribution and/or service (12b-1) fees applicable to the Fund, and (ii) second, to the extent necessary, the Fund’s management fee, each waiver, reduction or reimbursement in an amount and for a period of time as determined by PIMCO or its affiliates.

In any month in which the investment management agreement is in effect, PIMCO may recoup from the Fund any portion of the management fee waived, reduced or reimbursed pursuant to the Agreement (the “Reimbursement Amount”) within 36 months of the time of the waiver, provided that such amount paid to PIMCO will not: 1) together with any recoupment of organizational expenses, pro rata share of expenses related to obtaining or maintaining a Legal Entity Identifier and pro rata Trustee fees pursuant to the expense limitation agreement between PIMCO and the Trust, exceed the Expense Limit (or the amount of the expense limit in place at the time the amount being recouped was originally waived if lower than the Expense Limit); 2) exceed the total Reimbursement Amount; 3) include any amounts previously reimbursed to PIMCO; or 4) cause any Fund to maintain a net negative yield. The Reimbursement Amount will be reimbursed in the same order that fees were waived as described above, except the Funds will not reimburse PIMCO or its affiliates for any portion of the distribution and/or service (12b-1) fees waived, reduced or reimbursed pursuant to the Agreement. There is no guarantee that the Funds will maintain a positive net yield.

The Trust does not currently authorize payment of any distribution and/or service (12b-1) fees. If distribution and/or service (12b-1) fees are authorized in the future, to the extent PIMCO or its affiliates waive, reduce or reimburse any portion of the distribution and/or service (12b-1) fees pursuant to the Agreement, PIMCO or its affiliates may pay or reimburse financial institutions for services for which such financial institutions

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 71

PIMCO ETF Trust

normally receive distribution and/or service (12b-1) fees from the applicable Fund out of PIMCO's or its affiliates' own assets. These payments and reimbursements may be made from profits received by PIMCO from management fees paid to PIMCO by the Funds. Such activities by PIMCO or its affiliates may provide incentives to financial institutions to purchase or market shares of the Funds. Additionally, these activities may give PIMCO or its affiliates additional access to sales representatives of such financial institutions, which may increase sales Fund shares.

Individual Portfolio Managers

The following individuals have primary responsibility for managing each of the noted Funds.

Fund	Portfolio Manager	Since	Recent Professional Experience
PIMCO Multisector Bond Active Exchange-Traded Fund	Daniel Ivascyn	6/23*	Group Chief Investment Officer and Managing Director, PIMCO. Prior to joining PIMCO in 1998, he worked at Bear Stearns in the asset backed securities group, as well as T. Rowe Price and Fidelity Investments. He has investment experience since 1992 and holds an MBA in analytic finance from the University of Chicago Graduate School of Business and a bachelor’s degree in economics from Occidental College.
PIMCO Enhanced Low Duration Active Exchange-Traded Fund	Sonali Pier	7/19	Managing Director, PIMCO. Ms. Pier is a portfolio manager focusing on multisector credit opportunities. Prior to joining PIMCO in 2013, she was a senior credit trader at J.P. Morgan, trading cash, recovery and credit default swaps across various sectors. She has investment experience since 2003 and holds an undergraduate degree in economics from Princeton University.
PIMCO Multisector Bond Active Exchange-Traded Fund	Sonali Pier	6/23*
PIMCO Active Bond Exchange-Traded Fund	David Braun	5/17	Managing Director, PIMCO. Mr. Braun is head of the U.S. financial institutions group portfolio management team and a senior member of both the liability driven investment portfolio and the U.S. core management teams. Prior to joining PIMCO in 2009, he was a derivatives portfolio manager and chief risk officer at Hartford Investment Management Company. He has investment experience since 1993 and holds an undergraduate degree in mathematics from the University of Connecticut.
PIMCO Enhanced Low Duration Active Exchange-Traded Fund	David Braun	5/17
PIMCO Active Bond Exchange-Traded Fund	Daniel Hyman	5/17	Managing Director, PIMCO. Mr. Hyman is a portfolio manager focusing on mortgage-backed securities and derivatives. Prior to joining PIMCO in 2008, he was a vice president at Credit Suisse where he traded agency pass-throughs. He has investment experience since 2002 and holds an undergraduate degree from Lehigh University.
PIMCO Intermediate Municipal Bond Active Exchange-Traded Fund	David Hammer	6/16	Managing Director, PIMCO. Mr. Hammer is a managing director in the Newport Beach office and leads municipal bond portfolio management, with oversight of the firm’s municipal investment grade, high yield, taxable, and separately managed accounts. He is the lead portfolio manager on PIMCO’s municipal bond fund complex, including investment grade, high yield, state-specific, closed-end funds, and interval fund. Prior to rejoining PIMCO in 2015, he was a managing director at Morgan Stanley, where he was head of municipal trading, risk management, and research. He has investment experience since 2003 and holds an undergraduate degree from Syracuse University.
PIMCO Short Term Municipal Bond Active Exchange-Traded Fund		8/15
PIMCO Municipal Income Opportunities Active Exchange-Traded Fund		9/21*
PIMCO Active Bond Exchange-Traded Fund	Jerome Schneider	5/17	Managing Director, PIMCO. Mr. Schneider joined PIMCO in 2008 as a portfolio manager and finance specialist. Since 2011, he has served as the head of the short-term and funding desk. Prior to joining PIMCO, he served as Senior Managing Director with Bear Stearns, specializing in credit and mortgage-related funding transactions. Mr. Schneider has investment experience since 1995 and holds an undergraduate degree in economics and international relations from the University of Pennsylvania and an MBA from the Stern School of Business at New York University.
PIMCO Enhanced Low Duration Active Exchange-Traded Fund		1/14
PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund		12/19*
PIMCO Enhanced Short Maturity Active Exchange-Traded Fund		11/09*
PIMCO Prime Limited Maturity Active Exchange-Traded Fund		*
PIMCO Ultra Short Government Active Exchange-Traded Fund		6/23*
PIMCO Commodity Strategy Active Exchange-Traded Fund		5/23*
PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund	Jelle Brons	12/19*	Executive Vice President, PIMCO. Mr. Brons is a portfolio manager on the global corporate bond team. Prior to joining PIMCO in 2005, Mr. Brons worked at UBS Investment Bank in the credit fixed income department, initially in credit sales and then with the team responsible for CreditDelta, a credit market and portfolio analysis tool. He has investment experience since 2002 and holds a master’s degree in actuarial science and econometrics from the University of Amsterdam and a master’s degree in financial engineering and quantitative analysis from the ICMA Business School at the University of Reading. He is a Certified Financial Risk Manager (FRM) and is a CFA charterholder.

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Fund	Portfolio Manager	Since	Recent Professional Experience
PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund	Nathan Chiaverini	12/19*	Senior Vice President, PIMCO. Mr. Chiaverini is a portfolio manager on the short-term desk. Prior to joining PIMCO in 2012, he was a vice president and portfolio manager at BlackRock, focusing on institutional multi-sector portfolios. Prior to this, he held trading and strategy research positions within interest rate derivatives and mortgage-backed securities at Barclays Capital. He has investment experience since 2004 and holds a bachelor’s degree in economics and history from the University of Colorado and an MBA in analytic finance and economics from the University of Chicago Booth School of Business.
PIMCO Enhanced Short Maturity Active Exchange-Traded Fund	Nathan Chiaverini	7/21
PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund	Andrew Wittkop	12/19*	Executive Vice President, PIMCO. Mr. Wittkop is a portfolio manager focusing on short and low duration portfolios. He previously worked on the U.S. interest rate desk trading Treasuries, agencies and interest rate derivatives. Prior to that, he worked on the real return desk. He has investment experience since 2001 and holds an MBA from Stern School of Business at New York University and an undergraduate degree from the University of California, Los Angeles.
PIMCO Enhanced Short Maturity Active Exchange-Traded Fund		7/21
PIMCO Ultra Short Government Active Exchange-Traded Fund		6/23*
PIMCO Commodity Strategy Active Exchange-Traded Fund		5/23*
PIMCO Intermediate Municipal Bond Active Exchange-Traded Fund	Kyle Christine	4/23	Senior Vice President, PIMCO. Mr. Christine is a senior vice president and municipal bond portfolio manager in the Newport Beach office. Prior to joining PIMCO in 2017, he was an institutional high yield and taxable municipal bond trader at Morgan Stanley. He has eight years of investment and financial services experience and holds an undergraduate degree from Union College (NY).
PIMCO Short Term Municipal Bond ActiveExchange-Traded Fund		4/23
PIMCO Municipal Income Opportunities Active Exchange-Traded Fund		9/21*
PIMCO Senior Loan Active Exchange-Traded Fund	Giang Bui	6/22*	Executive Vice President, PIMCO. Ms. Bui is an executive vice president in the Newport Beach office and a portfolio manager and trader of securitized debt instruments, focusing on collateralized loan obligations (CLOs), asset-backed collateralized debt obligations, and off-the-run sectors within structured products. Ms. Bui joined PIMCO in 2000 and was previously a member of the bank loan portfolio management team, responsible for bank loan investments and the management of PIMCO-issued CLOs. She has investment experience since 2000 and holds an MBA from the Anderson School of Management at the University of California, Los Angeles and an undergraduate degree from the University of California, San Diego.
PIMCO Senior Loan Active Exchange-Traded Fund	Tanuj Dora	6/22*	Senior Vice President, PIMCO. Mr. Dora heads Capital Markets for PIMCO’s ETF business and works on efficient trading and portfolio management of PIMCO ETFs. Prior to joining PIMCO in 2021, Mr. Dora was a Portfolio Manager for Fixed Income ETFs and index mandates at DWS (formerly Deutsche Asset Management), managing over $7 billion in ETF assets. Mr. Dora joined DWS in 2016 and was responsible for launching and building out DWS's fixed income ETF business in the US. Prior to his role at DWS, he was based in London working for Deutsche Bank AG as an ETF market maker and trader. He holds B. Tech and M.Tech degrees in industrial engineering and management from Indian Institute of Technology Kharagpur.
PIMCO Preferred and Capital Securities Active Exchange-Traded Fund	Tanuj Dora	1/23*
PIMCO Senior Loan Active Exchange-Traded Fund	Jason Duko	5/23	Executive Vice President, PIMCO. Mr. Duko is an executive vice president and portfolio manager in the Newport Beach office focusing on U.S. leveraged finance, including bank loans and collateralized loan obligations (CLOs), high yield, and multi-sector credit strategies. Prior to rejoining PIMCO in 2023, he was at Ares Management, where he was a partner and portfolio manager responsible for managing U.S. bank loan credit strategies. He was at PIMCO from 2011–2018, managing bank loan portfolios and responsible for secondary loan trading across all sectors. Previously, he held roles at Lord Abbett, Nomura Corporate Research and Asset Management (NCRAM), and ING Pilgrim Research. He has 25 years of investment experience and holds an undergraduate degree in finance from Arizona State University.
PIMCO Multisector Bond Active Exchange-Traded Fund	Jason Duko	6/23*
PIMCO Senior Loan Active Exchange-Traded Fund	David Forgash	6/22*	Managing Director, PIMCO. Mr. Forgash is a portfolio manager and head of global leveraged loans. In addition to being the lead portfolio manager for leveraged loans, he is also a member of the high yield and multi-sector credit teams. Prior to joining PIMCO in 2018, he was a senior portfolio manager at Millennium Capital Partners, investing across European credit. Previously, he was an executive director of European credit trading at Morgan Stanley, a managing director of U.S. credit trading at Greenwich Capital and a vice president in credit trading at Lehman Brothers. He has investment experience since 1994 and holds an MBA from the Stern School of Business at New York University. He received an undergraduate degree in economics from the University of Delaware.
PIMCO Ultra Short Government Active Exchange-Traded Fund	Geoffrey Miles	6/23*	Vice President, PIMCO. Mr. Miles is a portfolio manager on the short-term desk. He was previously a portfolio associate and before that, worked in both operations and the legal and compliance department. He has investment experience since 2007 and holds an MBA from the UCLA Anderson School of Management and an undergraduate degree in economics from the University of Virginia.

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Fund	Portfolio Manager	Since	Recent Professional Experience
PIMCO Ultra Short Government Active Exchange-Traded Fund	William Martinez	6/23*	Executive Vice President, PIMCO. Mr. Martinez is portfolio manager on the short-term desk in the Newport Beach office, primarily focused on funding and collateral trading strategies. Prior to joining PIMCO in 2013, he was an associate director at Barclays, focusing on short-term fixed income markets and global funding trading strategies. He investment experience since 2005 and holds an undergraduate degree from Columbia University.
PIMCO Commodity Strategy Active Exchange-Traded Fund	Greg Sharenow	5/23*	Managing Director, PIMCO. Mr. Sharenow is a portfolio manager in the Newport Beach office, focusing on commodities, real assets, and inflation solutions. He leads PIMCO’s commodity portfolio management group. He also co-manages PIMCO’s Energy and Tactical Credit Opportunities strategy. Prior to joining PIMCO in 2011, he was an energy trader at Hess Energy Trading, Goldman Sachs, and DE Shaw. He was previously senior energy economist at Goldman Sachs and before that, worked as a quantitative analyst in the Global Portfolio Analysis group at Goldman Sachs. His co-authored article, “Beating Benchmarks,” won the Second Annual Berstein Fabozzi/Jacobs Levy Award for Outstanding Article after it was published in the Journal of Portfolio Management. He has investment and financial services experience since 2000 and holds bachelor’s degrees in mathematical methods in the social sciences and in economics from Northwestern University. He is a member of the Council on Foreign Relations.
PIMCO Commodity Strategy Active Exchange-Traded Fund	Lewis Hagedorn	5/23*	Executive Vice President, PIMCO. Mr. Hagedorn is a commodities portfolio manager in the Newport Beach office. He has spent the entirety of his career in commodity markets, with a primary focus on agriculture. Prior to joining PIMCO in 2018, he was a proprietary trader at TrailStone Group in London, and previously worked at Citadel and Brevan Howard. Mr. Hagedorn began his career as an economist for the Chicago Board of Trade before joining J.P. Morgan, where he was head of agricultural commodities research and strategy. He has investment experience since 2005 and holds a master of science degree in agricultural economics and undergraduate degrees in economics and psychology from the University of Illinois at Urbana Champaign.
PIMCO Commodity Strategy Active Exchange-Traded Fund	Andrew DeWitt	5/23*	Senior Vice President, PIMCO. Mr. DeWitt is a portfolio manager in the Newport Beach office, focusing on commodity and multi-real asset strategies. Previously, he managed PIMCO’s portfolio associate group and focused on portfolio optimization and other technology initiatives. He has investment experience since 2006 and holds undergraduate degrees in economics and sociology from Brown University.
PIMCO Multisector Bond Active Exchange-Traded Fund	Alfred Murata	6/23*	Managing Director, PIMCO. Mr. Murata is a portfolio manager focusing on mortgage- and asset-backed securities. Prior to joining PIMCO in 2001, he researched and implemented exotic equity and interest-rate derivatives at Nikko Financial Technologies. He has investment experience since 2000 and holds a PhD in engineering-economic systems and operations research from Stanford University.
PIMCO Multisector Bond Active Exchange-Traded Fund	Amit Arora	6/23*	Executive Vice President, PIMCO. Mr. Arora is a portfolio manager on the global corporate bond team. He was previously a senior member of PIMCO’s global risk management team. Prior to joining PIMCO in 2009, he was an executive director, responsible for credit hybrids and exotics trading, at J.P. Morgan. Mr. Arora was previously with Bear Stearns as a managing director on the structured credit derivatives trading desk, responsible for pricing, trading and hedging of all non-single name credit derivative products in investment grade and high yield credits. Before joining Bear Stearns, he worked on the foreign exchange Treasury desk at Citibank. He has investment experience since 1997 and holds an MBA from NYU Stern School of Business and a bachelor’s degree in mechanical engineering from the Indian Institute of Technology (IIT Bombay). He is a Certified Financial Risk Manager (FRM).
PIMCO Preferred and Capital Securities Active Exchange-Traded Fund	Amit Arora	1/23*
PIMCO Multisector Bond Active Exchange-Traded Fund	Mukundan Devarajan	6/23*	Executive Vice President, PIMCO. Mr. Devarajan is an empirical research analyst. Prior to joining PIMCO in 2011, he was an executive director in the quantitative strategies group at Nomura International, focusing on systematic frameworks for macro investing in the global fixed income markets. Previously, Mr. Devarajan was director, quantitative strategies at Lehman Brothers International. He has investment and financial services experience since 2005 and holds a postgraduate diploma in management from the Indian Institute of Management Ahmedabad in India. He received a bachelor of commerce degree from Delhi University.
PIMCO Preferred and Capital Securities Active Exchange-Traded Fund	Philippe Bodereau	1/23*	Managing Director and global head of financial research. Mr. Bodereau is also the lead analyst for global financial institutions. Prior to joining PIMCO in 2004, he was a senior banking analyst at Société Générale in London and Paris. Mr. Bodereau started his career at J.P. Morgan in 1996, where he held various positions in the private banking and global markets divisions in Brussels and London. Mr. Bodereau has investment experience since 1996 and holds a master’s degree in finance from French business school EDHEC.
PIMCO Preferred and Capital Securities Active Exchange-Traded Fund	Matthieu Loriferne	1/23*	Executive Vice President, PIMCO. Mr. Loriferne is an executive vice president and credit analyst in the London office. In addition, he is a portfolio manager for the Capital Securities strategy. He focuses on European and North American systemically important financial institutions. Prior to joining PIMCO in 2005, he was a credit analyst at Societe Generale in London and in Paris. He has investment experience since 2003 and holds a master’s degree in finance from the French business school SKEMA (ex-CERAM Sophia Antipolis).

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Prospectus

Inception of the Fund.

Please see the SAI for additional information about other accounts managed by the portfolio managers, the portfolio managers' compensation and the portfolio managers' ownership of shares of the Funds.

The Trustees are responsible generally for overseeing the management of the Trust. The Trustees authorize the Trust to enter into service agreements with the Investment Adviser, the Distributor (as defined below), and other service providers in order to provide, and in some cases authorize service providers to procure through other parties, necessary or desirable services on behalf of the Trust and the Funds. Shareholders are not parties to or third-party beneficiaries of such service agreements. Neither this prospectus nor summary prospectus, the Trust’s SAI, any contracts filed as exhibits to the Trust’s registration statement, nor any other communications, disclosure documents or regulatory filings from or on behalf of the Trust or a Fund creates a contract between or among any shareholder of a Fund, on the one hand, and the Trust, a Fund, a service provider to the Trust or a Fund, and/or the Trustees or officers of the Trust, on the other hand. The Trustees (or the Trust and its officers, service providers or other delegates acting under authority of the Trustees) may amend this, or use a new prospectus, summary prospectus or SAI with respect to a Fund or the Trust, and/or amend, file and/or issue any other communications, disclosure documents or regulatory filings, and may amend or enter into any contracts to which the Trust or a Fund is a party, and interpret the investment objective(s), policies, restrictions and contractual provisions applicable to any Fund, without shareholder input or approval, except in circumstances in which shareholder approval is specifically required by law (such as changes to fundamental investment policies) or where a shareholder approval requirement is specifically disclosed in the Trust’s then-current prospectus or SAI.

Distributor

The Trust’s Distributor is PIMCO Investments LLC (the “Distributor”). The Distributor, located at 1633 Broadway, New York, NY 10019, is a broker-dealer registered with the SEC. The Distributor distributes Creation Units for the Funds and does not maintain a secondary market in shares of the Funds.

Distribution and Servicing Plan

The Trust has adopted a Distribution and Servicing Plan (the “12b-1 Plan”) for shares of the Funds pursuant to Rule 12b-1 under the Investment Company Act of 1940, as amended (the “1940 Act”). The 12b-1 Plan permits compensation in connection with the distribution and marketing of Fund shares and/or the provision of certain shareholder services. The 12b-1 Plan permits the Fund to pay compensation at an annual rate of up to 0.25% of the Fund’s average daily net assets. However, the Board of Trustees has determined not to authorize payment of a 12b-1 Plan fee at this time. The 12b-1 fee may only be imposed or increased when the Board of Trustees determines that it is in the best interests of shareholders to do so. Because these fees are paid out of the Fund’s assets on an ongoing basis, to the extent that a fee is authorized, over time they will increase the cost of an investment in the Fund and therefore, the 12b-1 Plan fee may cost an investor more than other types of sales charges.

Payments to Broker-Dealers and Other Financial Intermediaries

PIMCO or the Distributor (for purposes of this subsection only, collectively, “PIMCO”) makes payments to broker-dealers or other financial intermediaries (each, an “Intermediary”) related to activities that are designed to make registered representatives, other professionals and individual investors more knowledgeable about the Funds or for other activities, such as participation in marketing activities and presentations, educational training programs, the support of technology platforms and/or reporting systems. PIMCO also makes payments to Intermediaries for certain printing, publishing and mailing costs associated with the Funds or materials relating to ETFs in general. In addition, PIMCO makes payments to Intermediaries that make Fund shares available to their clients, including on no transaction fee platforms, or for otherwise promoting the sale and distribution of the Funds. Such payments, which may be significant to the Intermediary, are not made by a Fund. Rather, such payments are made by PIMCO from its own resources, which may come directly or indirectly in part from management fees paid by the Funds. Payments of this type are sometimes referred to as marketing support or revenue-sharing payments. Such payments may include the reimbursement of ticket charges and revenue sharing tied to assets under management. An Intermediary may make decisions about which investment options it recommends or makes available, or the level of services provided, to its customers based on the marketing support payments it is eligible to receive. Therefore, such payments to an Intermediary create conflicts of interest between the Intermediary and its customers and may cause the Intermediary to recommend a Fund over another investment. More information regarding these payments is contained in the SAI. A shareholder should contact his or her Intermediary’s salesperson or other investment professional for more information regarding any such payments the Intermediary firm may receive from PIMCO.

Buying and Selling Shares

Shares of the Funds are listed for trading on a national securities exchange during the trading day. Each Fund’s primary listing exchange is NYSE Arca, except for PIMCO Active Bond Exchange-Traded Fund. The PIMCO Active Bond Exchange-Traded Fund's primary listing exchange is NYSE. Shares can be bought and sold throughout the trading day like shares of other publicly traded companies. However, there can be no guarantee that an active trading market will develop or be maintained, or that the Fund shares listing will continue or remain unchanged. The Trust does not impose any

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minimum investment for shares of a Fund purchased on an exchange. Buying or selling a Fund’s shares involves certain costs that apply to all securities transactions. When buying or selling shares of a Fund through a financial intermediary, you may incur a brokerage commission or other charges determined by your financial intermediary. Due to these brokerage costs, if any, frequent trading may detract significantly from investment returns. In addition, you may also incur the cost of the spread (the difference between the bid price and the ask price). The commission is frequently a fixed amount and may be a significant cost for investors seeking to buy or sell small amounts of shares. The spread varies over time for shares of a Fund based on its trading volume and market liquidity, and is generally less if the Fund has more trading volume and market liquidity and more if the Fund has less trading volume and market liquidity.

Shares of a Fund may be acquired through the Distributor or redeemed directly with the Fund only in Creation Units or multiples thereof, as discussed in the “Creations and Redemptions” section of the SAI. Once created, shares of a Fund generally trade in the secondary market in amounts less than a Creation Unit.

The Trust’s Board of Trustees has not adopted a policy of monitoring for frequent purchases and redemptions of Fund shares (“frequent trading”) that appear to attempt to take advantage of potential arbitrage opportunities presented by a lag between a change in the value of a Fund’s portfolio securities after the close of the primary markets for the Fund’s portfolio securities and the reflection of that change in the Fund’s NAV (“market timing”). The Trust believes this is appropriate because an ETF, such as each Fund, is intended to be attractive to arbitrageurs, as trading activity is critical to ensuring that the market price of Fund shares remains at or close to NAV. Since each Fund issues and redeems Creation Units at NAV plus applicable transaction fees, and each Fund’s shares may be purchased and sold on NYSE Arca, except for PIMCO Active Bond Exchange-Traded Fund's shares, which may be purchased and sold on NYSE, at prevailing market prices, the risks of frequent trading are limited.

The New York Stock Exchange (“NYSE”) is open for trading Monday through Friday and is closed on the following holidays: New Year’s Day, Martin Luther King, Jr. Day, Presidents’ Day, Good Friday, Memorial Day, Juneteenth National Independence Day, Independence Day, Labor Day, Thanksgiving Day and Christmas Day.

A “Business Day” with respect to the Funds is each day NYSE is open. Orders from Authorized Participants to create or redeem Creation Units will only be accepted on a Business Day. On days when NYSE closes earlier than normal, a Fund may require orders to create or redeem Creation Units to be placed earlier in the day. See the SAI for more information.

Section 12(d)(1) of the 1940 Act restricts investments by registered investment companies and companies relying on Sections 3(c)(1) or 3(c)(7) of the 1940 Act in the securities of other investment companies. Registered investment companies are permitted to invest in the Funds beyond the limits set forth in Section 12(d)(1), subject to certain terms and conditions set forth in Rule 12d1-4 under the 1940 Act, including in some cases that such investment companies enter into an agreement with the Trust.

The Trust typically does not offer or sell its shares to non-U.S. resident Authorized Participants. For purposes of this policy, a U.S. resident Authorized Participant is defined as an Authorized Participant that has a U.S. address of record at the time of sale.

Book Entry

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

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

Share Prices

The trading prices of a Fund’s shares in the secondary market generally differ from the Fund’s daily NAV per share and are affected by market forces such as supply and demand, economic conditions and other factors. Information regarding the intraday indicative value (“IIV”) of a Fund may be disseminated every 15 seconds throughout the trading day by the national securities exchange on which the Fund’s shares are primarily listed or by market data vendors or other information providers. The IIV is based on the current market value of the securities and/or cash included in a Fund’s IIV basket. The IIV does not necessarily reflect the precise composition of the current portfolio of securities and instruments held by a Fund at a particular point in time or the best possible valuation of the current portfolio. Unlike a Fund’s NAV, the IIV may not reflect estimated accrued interest, dividends and other income, or Fund expenses. Therefore, the IIV should not be viewed as a “real-time” update of the NAV, which is computed only once a day. The IIV is generally determined by using both current market quotations and/or price quotations obtained from broker-dealers that may trade in the

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portfolio securities and instruments included in a Fund’s IIV basket. The Fund is not involved in, or responsible for, the calculation or dissemination of the IIV and makes no representation or warranty as to its accuracy. An inaccuracy in the IIV could result from various factors, including the difficulty of pricing portfolio instruments on an intraday basis.

Premiums and Discounts

There may be differences between the daily market prices on secondary markets for shares of a Fund and the Fund’s NAV. NAV is the price per share at which the Fund issues and redeems shares. See “How Net Asset Value Is Determined” below. A Fund’s market price may be at, above or below its NAV. The NAV of a Fund will fluctuate with changes in the market value of its portfolio holdings. The market price of a Fund will fluctuate in accordance with changes in its NAV, as well as market supply and demand. Information regarding a Fund’s NAV and market price can be found at https://www.pimco.com/en-us/investments/etf.

Premiums or discounts are the differences (expressed as a percentage) between the NAV and the market price of a Fund on a given day, generally at the time the NAV is calculated. A premium is the amount that a Fund is trading above the reported NAV, expressed as a percentage of the NAV. A discount is the amount that a Fund is trading below the reported NAV, expressed as a percentage of the NAV. A discount or premium could be significant. Information regarding the frequency of daily premiums or discounts, generally at the time the NAV is calculated, can be found at www.pimcoetfs.com.

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Request for Multiple Copies of Shareholder Documents

To reduce expenses, it is intended that only one copy of the Fund’s prospectus and annual and semiannual reports to shareholders, when available, will be mailed to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please contact the financial intermediary through which you hold your shares.

Information Regarding State Escheatment Laws

Fund accounts can be considered abandoned property. States increasingly are looking at inactive accounts as possible abandoned or unclaimed property. Under certain circumstances, the Fund (or the broker or custodian of record having beneficial owner information) may be legally obligated to escheat (or transfer) an investor’s account to the appropriate state’s unclaimed property administrator. The Fund will not be liable to investors or their representatives for good faith compliance with state unclaimed or abandoned property (escheatment) laws.

Escheatment laws vary by state, and states have different criteria for defining inactivity and abandoned property. Generally, a fund account may be subject to “escheatment” (i.e., considered to be abandoned or unclaimed property) if the account owner has not initiated any activity in the account or contacted the fund for an “inactivity period” as specified in applicable state laws. Typically, an investor’s last known address of record determines the state that has jurisdiction.

The process described above, and the application of state escheatment laws, may vary depending on how shareholders hold their shares in the Fund.

How Net Asset Value Is Determined

The NAV of a Fund is determined by dividing the total value of a Fund’s portfolio investments and other assets attributable to that Fund, less any liabilities, by the total number of shares outstanding of that Fund.

On each day that the NYSE is open, Fund shares are ordinarily valued as of the close of regular trading (“NYSE Close”). Information that becomes known to the Funds or their agents after the time as of which NAV has been calculated on a particular day will not generally be used to retroactively adjust the price of a security or the NAV determined earlier that day. If regular trading on the NYSE closes earlier than scheduled, each Fund reserves the right to either (i) calculate its NAV as of the earlier closing time or (ii) calculate its NAV as of the normally scheduled close of regular trading on the NYSE for that day. Each Fund generally does not calculate its NAV on days during which the NYSE is closed. However, if the NYSE is closed on a day it would normally be open for business, each Fund reserves the right to calculate its NAV as of the normally scheduled close of regular trading on the NYSE for that day or such other time that the Fund may determine.

For purposes of calculating NAV, portfolio securities and other assets for which market quotations are readily available are valued at market value. A market quotation is readily available only when that quotation is a quoted price (unadjusted) in active markets for identical investments that the Funds can access at the measurement date, provided that a

quotation will not be readily available if it is not reliable. Market value is generally determined on the basis of official closing prices or the last reported sales prices. The Funds will normally use pricing data for domestic equity securities received shortly after the NYSE Close and do not normally take into account trading, clearances or settlements that take place after the NYSE Close. A foreign (non-U.S.) equity security traded on a foreign exchange or on more than one exchange is typically valued using pricing information from the exchange considered by PIMCO to be the primary exchange. If market value pricing is used, a foreign (non-U.S.) equity security will be valued as of the close of trading on the foreign exchange, or the NYSE Close, if the NYSE Close occurs before the end of trading on the foreign exchange.

Investments for which market quotations are not readily available are valued at fair value as determined in good faith pursuant to Rule 2a-5 under the 1940 Act. As a general principle, the fair value of a security or asset is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Pursuant to Rule 2a-5, the Board of Trustees has designated PIMCO as the valuation designee (“Valuation Designee”) for each Fund to perform the fair value determination relating to all Fund investments. PIMCO may carry out its designated responsibilities as Valuation Designee through various teams and committees. The Valuation Designee's policies and procedures govern the Valuation Designee's selection and application of methodologies for determining and calculating the fair value of Fund investments. The Valuation Designee may value Fund portfolio securities for which market quotations are not readily available and other Fund assets utilizing inputs from pricing services, quotation reporting systems, valuation agents and other third-party sources (together, “Pricing Sources”).

Domestic and foreign (non-U.S.) fixed income securities, non-exchange-traded derivatives, and equity options are normally valued on the basis of quotes obtained from brokers and dealers or Pricing Sources using data reflecting the earlier closing of the principal markets for those securities. Prices obtained from Pricing Sources may be based on, among other things, information provided by market makers or estimates of market values obtained from yield data relating to investments or securities with similar characteristics. Certain fixed income securities purchased on a delayed-delivery basis are marked to market daily until settlement at the forward settlement date. Exchange-traded options, except equity options, futures and options on futures are valued at the settlement price determined by the relevant exchange. Swap agreements are valued on the basis of bid quotes obtained from brokers and dealers or market-based prices supplied by Pricing Sources. With respect to any portion of a Fund’s assets that are invested in one or more open-end management investment companies (other than ETFs), the Fund’s NAV will be calculated based upon the NAVs of such investments.

If a foreign (non-U.S.) equity security’s value has materially changed after the close of the security’s primary exchange or principal market but before the NYSE Close, the security may be valued at fair value. Foreign (non-U.S.) equity securities that do not trade when the NYSE is open are also valued at fair value. With respect to foreign (non-U.S.) equity

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securities, the Fund may determine the fair value of investments based on information provided by Pricing Sources and other third-party vendors, which may recommend fair value or adjustments with reference to other securities, indexes or assets. In considering whether fair valuation is required and in determining fair values, the Valuation Designee may, among other things, consider significant events (which may be considered to include changes in the value of U.S. securities or securities indexes) that occur after the close of the relevant market and before the NYSE Close. A Fund may utilize modeling tools provided by third-party vendors to determine fair values of non-U.S. securities. For these purposes, unless otherwise determined by the Valuation Designee any movement in the applicable reference index or instrument (“zero trigger”) between the earlier close of the applicable foreign market and the NYSE Close may be deemed to be a significant event, prompting the application of the pricing model (effectively resulting in daily fair valuations). Foreign (non-U.S.) exchanges may permit trading in foreign (non-U.S.) equity securities on days when the Trust is not open for business, which may result in a Fund’s portfolio investments being affected when you are unable to buy or sell shares.

Senior secured floating rate loans will generally be valued at the mean of bid/ask prices in the market for such loans, as provided by a Pricing Service. Senior secured floating rate loans for which vendor prices are not available, will be valued at fair value, which is intended to approximate market value. In valuing a senior secured floating rate loan at fair value, the factors considered may include, but are not limited to, the following: (a) the creditworthiness of the borrower and any intermediate participants, (b) the terms of the loan, (c) recent prices in the market for similar loans, if any, and (d) recent prices in the market for instruments of similar quality, rate, period until next interest rate reset and maturity. Investments valued in currencies other than the U.S. dollar are converted to the U.S. dollar using exchange rates obtained from Pricing Sources. As a result, the value of such investments, and in turn, the NAV of the Fund’s shares may be affected by changes in the value of currencies in relation to the U.S. dollar. The value of investments traded in markets outside the United States or denominated in currencies other than the U.S. dollar may be affected significantly on a day that the Trust is not open for business. As a result, to the extent that a Fund holds foreign (non-U.S.) investments, the value of those investments may change at times when shareholders are unable to buy or sell shares and the value of such investments will be reflected in the Fund’s next calculated NAV.

Fair valuation may require subjective determinations about the value of a security. While the Trust’s and Valuation Designee's policies and procedures are intended to result in a calculation of the Fund’s NAV that fairly reflects security values as of the time of pricing, the Trust cannot ensure that fair values accurately reflect the price that a Fund could obtain for a security if it were to dispose of that security as of the time of pricing (for instance, in a forced or distressed sale). The prices used by the Fund may differ from the value that would be realized if the securities were sold.

Fund Distributions

Each Fund distributes substantially all of its net investment income to shareholders in the form of dividends. The Funds, except the PIMCO Commodity Strategy Active Exchange-Traded Fund, intend to declare and distribute income dividends monthly to shareholders of record. The PIMCO Commodity Strategy Active Exchange-Traded Fund intends to declare and distribute income dividends quarterly to shareholders of record. A Fund’s first distribution to shareholders is expected to occur after its first full calendar month of operations. In addition, each Fund distributes any net capital gains earned from the sale of portfolio securities to shareholders no less frequently than annually. Net short-term capital gains may be paid more frequently. Dividend payments are made through DTC participants and indirect participants to beneficial owners then of record with proceeds received from the Funds. No dividend reinvestment service is provided by the Trust. Financial intermediaries may make available the DTC book-entry Dividend Reinvestment Service for use by beneficial owners of Fund shares for reinvestment of their dividend distributions. Beneficial owners should contact their financial intermediary to determine the availability and costs of the service and the details of participation therein. Financial intermediaries may require beneficial owners to adhere to specific procedures and timetables. If this service is available and used, dividend distributions of both income and net capital gains will be automatically reinvested in additional whole shares of the Fund purchased in the secondary market.

Tax Consequences

The following information is meant as a general summary for U.S. taxpayers. Please see the SAI for additional information. You should rely on your own tax adviser for advice about the particular federal, state and local tax consequences to you of investing in any Fund.

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Taxes on Fund Distributions. If you are subject to U.S. federal income tax you will be subject to tax on taxable Fund distributions, other than exempt-interest dividends paid by the PIMCO Short Term Municipal Bond Active Exchange-Traded Fund, PIMCO Intermediate Municipal Bond Active Exchange-Traded Fund and PIMCO Municipal Income Opportunities Active Exchange-Traded Fund, as discussed below. For federal income tax purposes, taxable Fund distributions will be taxable to you as either ordinary income or capital gains.

Fund taxable dividends (i.e., distributions of investment income) are generally taxable to you as ordinary income. Federal taxes on Fund distributions of gains are determined by how long a Fund owned the investments that generated the gains, rather than how long you have owned your shares. Distributions of gains from investments that the Fund owned for more than one year will generally be taxable to you as long-term capital gains. Distributions of gains from investments that the Fund owned for one year or less will generally be taxable to you as ordinary income.

The tax treatment of income, gains and losses attributable to foreign currencies (and derivatives on such currencies), and various other special tax rules applicable to certain financial transactions and

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instruments could affect the amount, timing and character of a Fund’s distributions. In some cases, these tax rules could also result in a retroactive change in the tax character of prior distributions and may also possibly cause all, or a portion, of prior distributions to be reclassified as returns of capital for tax purposes. See “Returns of Capital” below.

Taxable Fund distributions are taxable to you even if they are paid from income or gains earned by a Fund prior to your investment and thus were included in the price you paid for your shares. For example, if you purchase shares on or just before the record date of a Fund distribution, you will pay full price for the shares and may receive a portion of your investment back as a taxable distribution.

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Taxes When You Sell Your Shares. Any gain resulting from the sale of Fund shares will generally be subject to federal income tax. Currently, any capital gain or loss realized upon a sale of Fund shares is generally treated as a long-term gain or loss if the shares have been held for more than one year. Any capital gain or loss realized upon a sale of Fund shares held for one year or less is generally treated as short-term gain or loss, except that any capital loss on the sale of shares held for six months or less is treated as long-term capital loss to the extent that capital gain dividends were paid with respect to such shares.

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Returns of Capital. If a Fund’s distributions exceed its taxable income and capital gains realized during a taxable year, all or a portion of the distributions made in the same taxable year may be recharacterized as a return of capital to shareholders. A return of capital distribution will generally not be taxable, but will reduce each shareholder’s cost basis in the Fund and result in a higher reported capital gain or lower reported capital loss when those shares on which the distribution was received are sold.

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Medicare Tax. An additional 3.8% Medicare tax is imposed on certain net investment income (including ordinary dividends and capital gain distributions received from a Fund and net gains from redemptions or other taxable dispositions of Fund shares) of U.S. individuals, estates and trusts to the extent that such person’s “modified adjusted gross income” (in the case of an individual) or “adjusted gross income” (in the case of an estate or trust) exceeds certain threshold amounts.

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Important Tax Reporting Considerations. The Internal Revenue Code of 1986 requires reporting of adjusted cost basis information for covered securities, which generally include shares of a regulated investment company acquired after January 1, 2012, to the IRS. Shareholders should contact their financial intermediaries with respect to reporting of cost basis and available elections for their accounts.

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A Note on the PIMCO Commodity Strategy Active Exchange-Traded Fund. One of the requirements for favorable tax treatment as a regulated investment company under the Code is that the Fund derive at least 90% of its gross income from certain qualifying sources of income. The IRS has issued a revenue ruling which holds that income derived from commodity

index-linked derivatives, if earned directly by the Fund, is not qualifying income under Subchapter M of the Code. As such, the Fund’s ability to utilize direct investments in commodity-linked swaps as part of its investment strategy is limited to a maximum of 10% of its gross income. However, in a subsequent revenue ruling, the IRS provides that income from alternative investment instruments (such as certain commodity index-linked notes) that create commodity exposure may be considered qualifying income under the Code. The IRS has issued private letter rulings in which the IRS specifically concluded that income derived from an investment in a subsidiary that provides commodity-linked exposure through its investments will constitute qualifying income. The Fund will continue to seek to gain exposure to the commodity markets primarily through investments in its Subsidiary and perhaps through commodity-linked notes. The Subsidiary will be treated as a controlled foreign corporation. As a result, the Fund with the Subsidiary will be required to include in gross income for U.S. federal income tax purposes all of its Subsidiary's “subpart F income,” whether or not such income is distributed by the Subsidiary. It is expected that all of the Subsidiary's income and realized gains and mark-to-market gains will be “subpart F income.” The Fund's recognition of its Subsidiary's “subpart F income” will increase the Fund's tax basis in its Subsidiary. Distributions by the Subsidiary to the Fund will be tax-free, to the extent of its previously undistributed “subpart F income,” and will correspondingly reduce the Fund's tax basis in its Subsidiary. “Subpart F income” is generally treated by the Fund as ordinary income, regardless of the character of the Subsidiary's underlying income or gains. If a net loss is realized by a Subsidiary, such loss is not generally available to offset the income earned by such Subsidiary's parent Fund, and such loss cannot be carried forward to offset taxable income of the parent Fund or the Subsidiary in future periods. Under IRS regulations, income derived from a controlled foreign corporation will be considered qualifying income if distributed to the Fund or if the Fund’s income from in the subsidiary is derived with respect to the Fund’s business of investing in securities. A subsidiary may pay such a distribution at any time. An IRS revenue procedure states that the IRS will not in the future issue private letter rulings that would require a determination of whether an asset (such as a commodity index-linked note) is a “security” under the 1940 Act. There can be no assurance that the IRS will not change its position with respect to some or all of these conclusions or that future legislation will not adversely impact the tax treatment of the Fund’s commodity-linked investments. If the IRS were to change or reverse its position, or if future legislation adversely affected the tax treatment of the Fund’s commodity-linked investments, there would likely be a significant adverse impact on the Fund, including the possibility of failing to qualify as a regulated investment company. If the Fund did not qualify as a regulated investment company for any taxable year, its taxable income would be subject to tax at the Fund level at regular corporate tax rates (without reduction for distributions to

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shareholders) and to a further tax at the shareholder level when such income is distributed. Furthermore, the tax treatment of the Fund's investments in its Subsidiary may otherwise be adversely affected by future legislation, court decisions, Treasury Regulations and/or guidance issued by the IRS. Such developments could affect the character, timing and/or amount of the Fund's taxable income or any distributions made by the Funds or result in the inability of the Funds to operate as described in this Prospectus.

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A Note on the PIMCO Commodity Strategy Active Exchange-Traded Fund. Periodic adjustments for inflation to the principal amount of an inflation-indexed bond may give rise to original issue discount, which will be includable in the Fund’s gross income. Due to original issue discount, the Fund may be required to make annual distributions to shareholders that exceed the cash received, which may cause the Fund to liquidate certain investments when it is not advantageous to do so. Also, if the principal value of an inflation-indexed bond is adjusted downward due to deflation, amounts previously distributed in the taxable year may be characterized in some circumstances as a return of capital.

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Backup Withholding. Shareholders may be subject to U.S. federal income tax withholding with respect to distributions payable to shareholders if they fail to provide their correct taxpayer identification number or to make required certifications, or if they have been notified by the IRS that they are subject to backup withholding. Backup withholding is not an additional tax. Any amounts withheld may be credited against U.S. federal income tax liability.

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Foreign Withholding Taxes. A Fund may be subject to foreign withholding or other foreign taxes, which in some cases can be significant on any income or gain from investments in foreign securities. In that case, the Fund’s total return on those securities would be decreased. Although in some cases the Fund may be able to apply for a refund of a portion of such taxes, the ability to successfully obtain such a refund may be uncertain. Each Fund may generally deduct these taxes in computing its taxable income. Rather than deducting these foreign taxes if more than 50% of the value of a Fund’s total assets at the close of its taxable year consists of stock or securities of foreign corporations or foreign governments, or if at least 50% of the value of a Fund’s total assets at the close of each quarter of its taxable year is represented by interests in other regulated investment companies, such Fund may make an election to treat a proportionate amount of eligible foreign taxes as constituting a taxable distribution to each shareholder, which would, subject to certain limitations, generally allow the shareholder to either (i) credit that proportionate amount of taxes against U.S. Federal income tax liability as a foreign tax credit or (ii) take that amount as an itemized deduction.

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A Note on the Tax-Exempt Municipal Funds. Dividends paid to shareholders of the PIMCO Short Term Municipal Bond Active

Exchange-Traded Fund, PIMCO Intermediate Municipal Bond Active Exchange-Traded Fund and PIMCO Municipal Income Opportunities Active Exchange-Traded Fund (collectively, the “Tax-Exempt Municipal Funds”) and derived from Municipal Bond interest are expected to be reported by the Tax-Exempt Municipal Funds as “exempt-interest dividends” and shareholders may generally exclude such dividends from gross income for federal income tax purposes. However, there can be no assurance that the Tax-Exempt Municipal Funds will satisfy the requirements to pay dividends eligible to be reported as “exempt-interest dividends” with respect to a particular taxable year. The federal tax exemption for “exempt-interest dividends” from Municipal Bonds does not necessarily result in the exemption of such dividends from state and local taxes. Each Tax-Exempt Municipal Fund may invest a portion of its assets in securities that generate income that is not exempt from federal or state income tax. Dividends derived from taxable interest or capital gains will be subject to federal income tax. The Tax-Exempt Municipal Funds seek to produce income that is generally exempt from federal income tax and will not benefit investors in tax-sheltered retirement plans or individuals not subject to federal income tax.

Any loss realized upon the sale or exchange of Tax-Exempt Municipal Fund shares with a tax holding period of six months or less will be disallowed to the extent of any distributions treated as exempt interest dividends with respect to such shares.

Foreign shareholders may be subject to U.S. tax withholding of 30% (or lower applicable treaty rate) on distributions from the Funds. Additionally, the Funds are required to withhold U.S. tax (at a 30% rate) on payments of taxable dividends made to certain non-U.S. entities that fail to comply (or are deemed noncompliant) with extensive reporting and withholding requirements designed to inform the U.S. Department of the Treasury of U.S.-owned foreign investment accounts. Shareholders may be requested to provide additional information to enable the Funds to determine whether withholding is required.

This “Tax Consequences” section relates only to federal income tax; the consequences under other tax laws may differ. Shareholders should consult their tax advisors as to the possible application of foreign, state and local income tax laws to Fund dividends and capital distributions. Please see “Taxation” in the SAI for additional information regarding the tax aspects of investing in the Funds.

Characteristics and Risks of Securities and Investment Techniques

This section provides additional information about some of the principal investments and related risks of the Funds described under “Fund Summaries” and “Description of Principal Risks” above. It also describes characteristics and risks of additional securities and investment techniques that may be used by the Funds from time to time.

Most of these securities and investment techniques described herein are discretionary, which means that PIMCO can decide whether to use them or not. This prospectus does not attempt to disclose all of the various types of securities and investment techniques that may be used by the

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Funds. As with any fund, investors in the Funds rely on the professional investment judgment and skill of PIMCO and the individual portfolio managers. Please see “Investment Objectives and Policies” in the SAI for more detailed information about the securities and investment techniques described in this section and about other strategies and techniques that may be used by the Funds.

The risks of investing in an Investing Fund may be closely related to the risks associated with the Underlying Funds and their investments. However, as each Investing Fund may also invest its assets directly in Fixed Income Instruments, equity securities, forwards or derivatives, such as options, futures contracts or swap agreements, other affiliated or unaffiliated funds, and other investments, each Investing Fund may be directly exposed to certain risks described below.

Because the PIMCO Commodity Strategy Active Exchange-Traded Fund may invest a portion of its assets in its respective Subsidiary, which may hold some of the investments described in this prospectus, the Fund may be indirectly exposed to the risks associated with those investments. With respect to its investments, the Subsidiary will generally be subject to the same fundamental, non-fundamental and certain other investment restrictions as the Fund; however, the Subsidiary (unlike the Fund) may invest without limitation in commodity-linked swap agreements and other commodity-linked derivative instruments. The Fund and its Subsidiary may test for compliance with certain investment restrictions on a consolidated basis, except that, in accordance with current federal securities and tax laws, rules and staff positions, with respect to their investments in certain securities that may involve leverage, a Subsidiary will comply to the same extent as the Fund.

Investors should be aware that the investments made by a Fund and the results achieved by a Fund at any given time, including for the same or similar investments, are not expected to be the same as those made by other funds for which PIMCO acts as investment adviser, including funds with names, investment objectives and policies, and/or portfolio management teams, similar to a Fund. This may be attributable to a wide variety of factors, including, but not limited to, the use of a different strategy or portfolio management team, the execution venue(s) used for a given strategy or Fund when a particular fund commenced operations or the size of a particular fund, in each case as compared to other similar funds.

Significant purchases and redemptions of its Creation Units for cash may adversely impact a Fund’s portfolio management. For example, a Fund may be forced to sell a comparatively large portion of its portfolio to meet significant Creation Unit redemptions for cash, or hold a comparatively large portion of its portfolio in cash due to significant Creation Unit purchases for cash, in each case when the Fund otherwise would not seek to do so. Such transactions may cause Funds to make investment decisions at inopportune times or prices or miss attractive investment opportunities. Such transactions may also accelerate the realization of taxable income if sales of securities resulted in gains and the Fund redeems Creation Units for cash, or otherwise cause a Fund to perform differently than intended. Similarly, significant purchases of its Creation Units for cash may adversely affect a Fund’s performance to

the extent the Fund is delayed in investing new cash and, as a result, holds a proportionally larger cash position than under ordinary circumstances. While such risks may apply to Funds of any size, such risks are heightened in Funds with fewer assets under management. In addition, new Funds may not be able to fully implement their investment strategy immediately upon commencing investment operations, which could reduce investment performance.

Certain PIMCO-advised funds (the “PIMCO Funds of Funds”) invest substantially all or a significant portion of their assets in other PIMCO-advised funds, including the Funds (“Underlying PIMCO Funds”). Similarly, other PIMCO-advised funds (the “Investing Funds”), including the Investing Funds, may invest a portion of their assets in Underlying PIMCO Funds. In some cases, the PIMCO Funds of Funds, the Investing Funds and certain funds managed by investment advisers affiliated with PIMCO (“Affiliated Funds of Funds”) may be the predominant or sole shareholders of a particular Underlying PIMCO Fund. Investment decisions made with respect to the PIMCO Funds of Funds, the Investing Funds and Affiliated Funds of Funds could, under certain circumstances, negatively impact the Underlying PIMCO Funds with respect to the expenses and investment performance of the Underlying PIMCO Funds. For instance, large purchases or redemptions of exchange-traded shares of an Underlying PIMCO Fund by the PIMCO Funds of Funds, the Investing Funds and Affiliated Funds of Funds, whether as part of a reallocation or rebalancing strategy or otherwise, may indirectly result in the Underlying PIMCO Fund having to sell securities or invest cash when it otherwise would not do so. Such transactions could increase an Underlying PIMCO Fund’s transaction costs and accelerate the realization of taxable income if sales of securities resulted in gains and the Fund redeems Creation Units for cash. Investments in exchange-traded shares of an Underlying PIMCO Fund by the PIMCO Funds of Funds, the Investing Funds or Affiliated Funds of Funds can generally contribute positively to such exchange-traded shares' trading volume and market liquidity, which in turn may contribute to decreased bid-ask spreads, but may also result in those funds holding additional cash and the need for those funds to engage in trades for their portfolios more frequently and incur relevant transaction and other expenses. On the other hand, sales of exchange-traded shares of an Underlying PIMCO Fund by the PIMCO Funds of Funds, the Investing Funds or Affiliated Funds of Funds can adversely impact such exchange-traded shares' trading volume and market liquidity, which may contribute to increased bid-ask spreads. Adverse impacts to an Underlying PIMCO Fund, such as these examples, may be exacerbated when the Underlying PIMCO Fund is invested in by another fund, such as an Investing Fund, that itself is invested in by other funds. Such structures could make asset flows, performance and other factors more volatile at the Underlying PIMCO Fund level. Additionally, as the PIMCO Funds of Funds and Affiliated Funds of Funds may invest substantially all or a significant portion of their assets in Underlying PIMCO Funds and the Investing Funds may invest a portion of their assets in Underlying PIMCO Funds, the Underlying PIMCO Funds may not acquire securities of other registered open-end

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investment companies in reliance on Section 12(d)(1)(F) or Section 12(d)(1)(G) of the 1940 Act, thus limiting the Underlying PIMCO Funds’ investment flexibility.

Investment Selection

The PIMCO Enhanced Low Duration Active Exchange-Traded Fund, PIMCO Commodity Strategy Active Exchange-Traded Fund and PIMCO Preferred and Capital Securities Active Exchange-Traded Fund seeks total return. The total return sought by the Fund consists of both income earned on the Fund’s investments and capital appreciation, if any, arising from increases in the market value of the Fund’s holdings. Capital appreciation of fixed income securities generally results from decreases in market interest rates, foreign currency appreciation, or improving credit fundamentals for a particular market sector or security. The other Funds seek to provide income earned on the Fund’s investments.

In selecting securities for a Fund, PIMCO develops an outlook for interest rates, currency exchange rates and the economy, analyzes credit and call risks and uses other security selection techniques. The proportion of a Fund’s assets committed to investment in securities with particular characteristics (such as quality, sector, interest rate or maturity) varies based on PIMCO’s outlook for the U.S. economy and the economies of other countries in the world, the financial markets and other factors. In selecting investments for the PIMCO Commodity Strategy Active Exchange-Traded Fund, PIMCO may use proprietary quantitative models that are developed and maintained by PIMCO, and which are subject to change over time without notice in PIMCO's discretion.

With respect to fixed income investing, PIMCO attempts to identify areas of the bond market that are undervalued relative to the rest of the market. PIMCO identifies these areas by grouping Fixed Income Instruments into sectors such as money markets, governments, corporates, mortgages, asset-backed and international. In seeking to identify undervalued currencies, PIMCO may consider many factors, including but not limited to longer-term analysis of relative interest rates, inflation rates, real exchange rates, purchasing power parity, trade account balances and current account balances, as well as other factors that influence exchange rates such as flows, market technical trends and government policies. Sophisticated proprietary software then assists in evaluating sectors and pricing specific investments. Once investment opportunities are identified, PIMCO will shift assets among sectors depending upon changes in relative valuations, credit spreads and other factors. There is no guarantee that PIMCO’s investment selection techniques will produce the desired results.

Fixed Income Instruments

“Fixed Income Instruments,” as used generally in this Prospectus, includes:

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securities issued or guaranteed by the U.S. Government, its agencies or government-sponsored enterprises (“U.S. Government Securities”);

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corporate debt securities of U.S. and non-U.S. issuers, including convertible securities and corporate commercial paper;

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mortgage-backed and other asset-backed securities;

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inflation-indexed bonds issued both by governments and corporations;

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structured notes, including hybrid or “indexed” securities and event-linked bonds;

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bank capital and trust preferred securities;

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loans, including participations in and assignments thereof;

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delayed funding loans and revolving credit facilities;

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bank certificates of deposit, fixed time deposits and bankers’ acceptances;

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repurchase agreements on Fixed Income Instruments and reverse repurchase agreements on Fixed Income Instruments;

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debt securities issued by states or local governments and their agencies, authorities and other government-sponsored enterprises;

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obligations of non-U.S. governments or their subdivisions, agencies and government-sponsored enterprises; and

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obligations of international agencies or supranational entities.

Securities issued by U.S. Government agencies or government- sponsored enterprises may not be guaranteed by the U.S. Treasury.

Each Fund (except the PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund, PIMCO Enhanced Short Maturity Active Exchange-Traded Fund, PIMCO Ultra Short Government Active Exchange-Traded Fund and PIMCO Prime Limited Maturity Active Exchange-Traded Fund), to the extent permitted by the 1940 Act, the rules thereunder or any exemptive relief therefrom, may invest in derivatives based on Fixed Income Instruments. The PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund and PIMCO Enhanced Short Maturity Active Exchange-Traded Fund, to the extent permitted by the 1940 Act, the rules thereunder or exemptive relief therefrom, may invest in futures contracts based on Fixed Income Instruments.

Duration

Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates that incorporates a security’s yield, coupon, final maturity and call features, among other characteristics. The longer a security’s duration, the more sensitive it will be to changes in interest rates. Similarly, a fund with a longer average portfolio duration will be more sensitive to changes in interest rates than a fund with a shorter average portfolio duration. By way of example, the price of a bond fund with an average duration of eight years would be expected to fall approximately 8% if interest rates rose by one percentage point. Conversely, the price of a bond fund with an average duration of negative three years would be expected to rise approximately 3% if interest rates rose by one percentage point. The maturity of a security, another commonly used measure of price sensitivity, measures only the time until final payment is due, whereas duration takes into account the pattern of all payments of interest and principal on a security over time, including how these payments are affected by prepayments and by changes in interest rates, as well as the time until an interest rate is reset (in the case of variable-rate securities). PIMCO uses an internal

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model for calculating duration, which may result in a different value for the duration of an index compared to the duration calculated by the index provider or another third party.

U.S. Government Securities

U.S. Government Securities are obligations of, or guaranteed by, the U.S. Government, its agencies or government-sponsored enterprises. The U.S. Government does not guarantee the NAV of a Fund’s shares. U.S. Government Securities are subject to market and interest rate risk, as well as varying degrees of credit risk. Some U.S. Government Securities are issued or guaranteed by the U.S. Treasury and are supported by the full faith and credit of the United States. Other types of U.S. Government Securities are supported by the full faith and credit of the United States (but not issued by the U.S. Treasury). These securities may have less credit risk than U.S. Government Securities not supported by the full faith and credit of the United States. Such other types of U.S. Government Securities are: (1) supported by the ability of the issuer to borrow from the U.S. Treasury; (2) supported only by the credit of the issuing agency, instrumentality or government-sponsored corporation; or (3) supported by the United States in some other way. These securities may be subject to greater credit risk. U.S. Government Securities include zero coupon securities, which do not distribute interest on a current basis and tend to be subject to greater market risk than interest-paying securities of similar maturities. The U.S. Government Securities in which a Fund may invest may pay fixed,
floating, variable or adjustable interest rates.

Securities issued by U.S. Government agencies or government-sponsored enterprises may not be guaranteed by the U.S. Treasury. Government National Mortgage Association (“GNMA”), a wholly-owned U.S. Government corporation, is authorized to guarantee, with the full faith and credit of the U.S. Government, the timely payment of principal and interest on securities issued by institutions approved by GNMA and backed by pools of mortgages insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs. Government-related guarantors (i.e., not backed by the full faith and credit of the U.S. Government) include the Federal National Mortgage Association (“FNMA”) and the Federal Home Loan Mortgage Corporation (“FHLMC”). Pass-through securities issued by FNMA are guaranteed as to timely payment of principal and interest by FNMA but are not backed by the full faith and credit of the U.S. Government. FHLMC guarantees the timely payment of interest and ultimate collection of principal, but its participation certificates are not backed by the full faith and credit of the U.S. Government.

Municipal Bonds

Municipal Bonds are generally issued by states, territories, possessions and local governments and their agencies, authorities and other instrumentalities. Municipal Bonds are subject to interest rate, credit and market risk, uncertainties related to the tax status of a Municipal Bond or the rights of investors invested in these securities. The ability of an issuer to make payments could be affected by litigation, legislation or other political events or the bankruptcy of the issuer. In addition, imbalances in supply and demand in the municipal market may result in

a deterioration of liquidity and a lack of price transparency in the market. At certain times, this may affect pricing, execution and transaction costs associated with a particular trade. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may adversely affect the ability of a Fund to sell its municipal bonds at attractive prices or value municipal bonds. The value of certain municipal securities, in particular general obligation debt, may also be adversely affected by rising health care costs, increasing unfunded pension liabilities, changes in accounting standards and by the phasing out of federal programs providing financial support. Lower-rated Municipal Bonds are subject to greater credit and market risk than higher-quality Municipal Bonds. Municipal Bonds may also have exposure to potential physical risks resulting from climate change, including extreme weather, flooding and fires. Climate risks, if they materialize, can adversely impact a municipal issuer’s financial plans in current or future years including, for example, the physical impairment of a facility or other source generating revenues backing a municipal issuer’s revenue bonds. As a result, the impact of climate risks could adversely impact the value of a Fund’s Municipal Bond investments. The types of Municipal Bonds in which the Funds may invest include municipal lease obligations, municipal general obligation bonds, municipal essential service revenue bonds, municipal cash equivalents, loans, mortgages, pre-refunded and escrowed to maturity Municipal Bonds and other debt instruments and pools of any of the foregoing. The Funds may also invest in industrial development bonds, which are Municipal Bonds issued by a government agency on behalf of a private sector company and, in most cases, are not backed by the credit of the issuing municipality and may therefore involve more risk. The Funds may also invest in securities issued by entities whose underlying assets are Municipal Bonds.

Pre-refunded Municipal Bonds are tax-exempt bonds that have been refunded to a call date on or before the final maturity of principal and remain outstanding in the municipal market. The payment of principal and interest of the pre-refunded Municipal Bonds held by a Fund is funded from securities in a designated escrow account that holds U.S. Treasury securities or other obligations of the U.S. Government (including its agencies and instrumentalities (“Agency Securities”)). As the payment of principal and interest is generated from securities held in a designated escrow account, the pledge of the municipality has been fulfilled and the original pledge of revenue by the municipality is no longer in place. The escrow account securities pledged to pay the principal and interest of the pre-refunded Municipal Bond do not guarantee the price movement of the bond before maturity. Issuers of municipal bonds refund in advance of maturity the outstanding higher cost debt and issue new, lower cost debt, placing the proceeds of the lower cost issuance into an escrow account to pre-refund the older, higher cost debt. Investment in pre-refunded Municipal Bonds held by a Fund may subject the Fund to interest rate risk, market risk and credit risk. In addition, while a secondary market exists for pre-refunded Municipal Bonds, if a Fund sells pre-refunded Municipal Bonds prior to maturity, the price received may be more or less than the original cost, depending on market conditions at the time of sale.

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Certain Funds may invest in trust certificates issued in tender option bond programs. In these programs, a trust typically issues two classes of certificates and uses the proceeds to purchase municipal securities having relatively long maturities and bearing interest at a fixed interest rate substantially higher than prevailing short-term tax-exempt rates. There is a risk that a Fund investing in a tender option bond program will not be considered the owner of a tender option bond for federal income tax purposes, and thus will not be entitled to treat such interest as exempt from federal income tax. Certain tender option bonds may be illiquid or may become illiquid as a result of, among other things, a credit rating downgrade, a payment default or a disqualification from tax-exempt status.

A Fund’s investment in the securities issued by a tender option bond trust may involve greater risk and volatility than an investment in a fixed rate bond, and the value of such securities may decrease significantly when market interest rates increase. Tender option bond trusts could be terminated due to market, credit or other events beyond a Fund’s control, which could require the Fund to dispose of portfolio investments at inopportune times and prices. A Fund may use a tender option bond program as a way of achieving leverage in its portfolio, in which case the Fund will be subject to leverage risk. The use of tender option bonds typically will impact the Fund's duration and cause the Fund to be subject to increased duration and interest rate risk.

High Yield Securities

The PIMCO Active Bond Exchange-Traded Fund, PIMCO Enhanced Low Duration Active Exchange-Traded Fund, PIMCO Multisector Bond Active Exchange-Traded Fund, PIMCO Municipal Income Opportunities Active Exchange-Traded Fund, PIMCO Preferred and Capital Securities Active Exchange-Traded Fund and PIMCO Senior Loan Active Exchange-Traded Fund may invest in high yield securities. Securities rated lower than Baa by Moody’s, or equivalently rated by S&P or Fitch, are sometimes referred to as “high yield securities” or “junk bonds.” Investing in these securities involves special risks in addition to the risks associated with investments in higher-rated fixed income securities. While offering a greater potential opportunity for capital appreciation and higher yields, high yield securities typically entail greater potential price volatility and may be less liquid than higher-rated securities. High yield securities may be regarded as predominately speculative with respect to the issuer’s continuing ability to meet principal and interest payments. They may also be more susceptible to real or perceived adverse economic and competitive industry conditions than higher-rated securities. Certain Funds may invest in securities that are in default with respect to the payment of interest or repayment of principal, or present an imminent risk of default with respect to such payments. Issuers of securities in default may fail to resume principal or interest payments, in which case a Fund may lose its entire investment.

The market values of high yield securities tend to reflect individual developments of the issuer to a greater extent than do higher-quality securities, which tend to react mainly to fluctuations in the general level of interest rates. In addition, lower-quality debt securities tend to be more sensitive to general economic conditions. Certain emerging market governments that issue high yield securities in which a Fund may invest

are among the largest debtors to commercial banks, foreign governments and supranational organizations, such as the World Bank, and may not be able or willing to make principal and/or interest payments as they come due.

Mortgage-Related and Other Asset-Backed Securities

Mortgage-related securities include mortgage pass-through securities, collateralized mortgage obligations (“CMOs”), commercial mortgage-backed securities, mortgage dollar rolls, CMO residuals, stripped mortgage-backed securities (“SMBSs”) and other securities that directly or indirectly represent a participation in, or are secured by and payable from, mortgage loans on real property. A to-be-announced (“TBA”) transaction is a method of trading mortgage-backed securities. In a TBA transaction, the buyer and seller agree upon general trade parameters such as issuer, maturity, coupon, face value, price and the settlement date. The actual pools delivered generally are determined two days prior to the settlement date.

The value of some mortgage-related and other asset-backed securities may be particularly sensitive to changes in prevailing interest rates. Early repayment of principal on some mortgage-related securities may expose a Fund to a lower rate of return upon reinvestment of principal. When interest rates rise, the value of a mortgage-related security generally will decline; however, when interest rates are declining, the value of mortgage-related securities with prepayment features may not increase as much as other fixed income securities. The rate of prepayments on underlying mortgages will affect the price and volatility of a mortgage-related security, and may shorten or extend the effective maturity of the security beyond what was anticipated at the time of purchase. If unanticipated rates of prepayment on underlying mortgages increase the effective maturity of a mortgage-related security, the volatility of the security can be expected to increase. See “Extension Risk” and “Prepayment Risk” below. The value of these securities may fluctuate in response to the market’s perception of the creditworthiness of the issuers. Additionally, although mortgages and mortgage-related securities are generally supported by some form of government or private guarantee and/or insurance, there is no assurance that guarantors or insurers will meet their obligations.

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Extension Risk. Mortgage-related and other asset-backed securities are subject to Extension Risk, which is the risk that the issuer of such a security pays back the principal of such an obligation later than expected. This may occur when interest rates rise. This may negatively affect Fund returns, as the value of the security decreases when principal payments are made later than expected. In addition, because principal payments are made later than expected, the Fund may be prevented from investing proceeds it would otherwise have received at a given time at the higher prevailing interest rates.

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Prepayment Risk. Mortgage-related and other asset-backed securities are subject to Prepayment Risk, which is the risk that the issuer of such a security pays back the principal of such an obligation earlier than expected (due to the sale of the underlying property, refinancing, or foreclosure). This may occur when

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interest rates decline. Prepayment may expose a Fund to a lower rate of return upon reinvestment of principal. Also, if a security subject to prepayment has been purchased at a premium, the value of the premium would be lost in the event of prepayment.

One type of SMBS has one class receiving all of the interest from the mortgage assets (the interest-only, or “IO” class), while the other class will receive all of the principal (the principal-only, or “PO” class). The yield to maturity on an IO class is extremely sensitive to the rate of principal payments (including prepayments) on the underlying mortgage assets, and a rapid rate of principal payments may have a material adverse effect on a Fund’s yield to maturity from these securities. The PIMCO Active Bond Exchange-Traded Fund, PIMCO Commodity Strategy Active Exchange-Traded Fund, PIMCO Enhanced Low Duration Active Exchange-Traded Fund, PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund, PIMCO Enhanced Short Maturity Active Exchange-Traded Fund, PIMCO Multisector Bond Active Exchange-Traded Fund, PIMCO Preferred and Capital Securities Active Exchange-Traded Fund and PIMCO Senior Loan Active Exchange-Traded Fund may invest up to 5% of their respective total assets in any combination of mortgage-related or other asset-backed IO, PO or inverse floater securities.

Certain Funds may invest in each of collateralized bond obligations (“CBOs”), collateralized loan obligations (“CLOs”), other collateralized debt obligations (“CDOs”) and other similarly structured securities. CBOs, CLOs and other CDOs are types of asset-backed securities. A CBO is a trust which is backed by a diversified pool of high-risk, below investment grade fixed income securities. A CLO is a trust typically collateralized by a pool of loans, which may include, among others, domestic and foreign senior secured loans, senior unsecured loans, and subordinate corporate loans, including loans that may be rated below investment grade or equivalent unrated loans. Other CDOs are trusts backed by other types of assets representing obligations of various parties. Certain Funds may invest in other asset-backed securities that have been offered to investors.

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Privately Issued Mortgage-Related Securities. Pools created by non-governmental issuers generally offer a higher rate of interest than government and government-related pools because there are no direct or indirect government or agency guarantees of payments in such pools. Privately issued mortgage-related securities are not subject to the same underwriting requirements for the underlying mortgages that are applicable to those mortgage-related securities that have a government or government-sponsored entity guarantee. As a result, the mortgage loans underlying privately issued mortgage-related securities may, and frequently do, have less favorable collateral, credit risk or other underwriting characteristics than government or government-sponsored mortgage-related securities and have wider variances in a number of terms including interest rate, term, size, purpose and borrower characteristics. The risk of nonpayment is greater for mortgage-related securities that are backed by loans that were originated under weak underwriting standards, including loans

made to borrowers with limited means to make repayment. A level of risk exists for all loans, although, historically, the poorest performing loans have been those classified as subprime. Privately issued mortgage-related securities are not traded on an exchange and there may be a limited market for the securities, especially when there is a perceived weakness in the mortgage and real estate market sectors. Without an active trading market, mortgage-related securities held in a Fund’s portfolio may be particularly difficult to value because of the complexities involved in assessing the value of the underlying mortgage loans.

Privately Issued Mortgage-Related Securities include securities that reflect an interest in, and are secured by, mortgage loans on commercial real property. Many of the risks of investing in commercial mortgage-backed securities reflect the risks of investing in the real estate securing the underlying mortgage loans. These risks reflect the effects of local and other economic conditions on real estate markets, the ability of tenants to make loan payments, and the ability of a property to attract and retain tenants.

Reinvestment

Each Fund may be subject to the risk that the returns of the Fund will decline during periods of falling interest rates because the Fund may have to reinvest the proceeds from matured, traded or called debt obligations at interest rates below the Fund’s current earnings rate. For instance, when interest rates decline, an issuer of debt obligations may exercise an option to redeem securities prior to maturity, thereby forcing a Fund to invest in lower-yielding securities. A Fund also may choose to sell higher-yielding portfolio securities and to purchase lower-yielding securities to achieve greater portfolio diversification, because the Fund’s portfolio managers believe the current holdings are overvalued or for other investment-related reasons. A decline in the returns received by a Fund from its investments is likely to have an adverse effect on the Fund’s NAV, yield and total return.

Focused Investment

To the extent that a Fund focuses its investments in a particular sector, the Fund may be susceptible to loss due to adverse developments affecting that sector. These developments include, but are not limited to, governmental regulation; inflation; rising interest rates; cost increases in raw materials, fuel and other operating expenses; technological innovations that may render existing products and equipment obsolete; competition from new entrants; high research and development costs; contagion risk within a particular industry or sector; increased costs associated with compliance with environmental or other governmental regulations; and other economic, business or political developments specific to that sector. Furthermore, a Fund may invest a substantial portion of its assets in companies in related sectors that may share common characteristics, are often subject to similar business risks and regulatory burdens, and whose securities may react similarly to the types of developments described above, which will subject the Fund to

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greater risk. A Fund also will be subject to focused investment risk to the extent that it invests a substantial portion of its assets in a particular issuer, market, asset class, country or geographic region.

Corporate Debt Securities

Corporate debt securities are subject to the risk of the issuer's inability to meet principal and interest payments on the obligation and may also be subject to price volatility due to such factors as interest rate sensitivity, market perception of the creditworthiness of the issuer and general market liquidity. When interest rates rise, the value of corporate debt securities can be expected to decline. Debt securities with longer maturities tend to be more sensitive to interest rate movements than those with shorter maturities. In addition, certain corporate debt securities may be highly customized and as a result may be subject to, among others, liquidity and pricing transparency risks.

Bank Capital Securities and Trust Preferred Securities

There are two common types of bank capital: Tier I and Tier II. Bank capital is generally, but not always, of investment grade quality. Tier I securities often take the form of trust preferred securities. Tier II securities are commonly thought of as hybrids of debt and preferred securities, are often perpetual (with no maturity date), callable and, under certain conditions, allow for the issuer bank to withhold payment of interest until a later date.

Trust preferred securities have the characteristics of both subordinated debt and preferred securities. The primary advantage of the structure of trust preferred securities is that they are treated by the financial institution as debt securities for tax purposes and as equity for the calculation of capital requirements. Trust preferred securities typically bear a market rate coupon comparable to interest rates available on debt of a similarly rated issuer. Typical characteristics include long-term maturities, early redemption by the issuer, periodic fixed or variable interest payments, and maturities at face value. The market value of trust preferred securities may be more volatile than those of conventional debt securities. There can be no assurance as to the liquidity of trust preferred securities and the ability of holders, such as a Fund, to sell their holdings.

Loans, including Participations in and Assignments thereof

not be made in a timely manner or at all, either of which may adversely affect the value of the loan. In addition, the collateral underlying a loan may be unavailable or insufficient to satisfy a borrower’s obligation, and a Fund could become part owner of any collateral if a loan is foreclosed, subjecting the Fund to costs associated with owning and disposing of the collateral. If a Fund purchases a participation, it may only be able to enforce its rights through the lender, and may assume the credit risk of the lender in addition to the borrower.

Volatility

Volatility measures the variability in the price of an investment over time. A higher volatility level signifies an investment’s value may fluctuate over a larger range within a short period of time, either up or down. A lower volatility level means an investment’s value is more likely to change within a narrower range, or less frequently, over time. The more volatile the portfolio holdings of a Fund, the less predictable the returns for a Fund. Higher volatility levels may indicate heightened risk of losses.

Variable and Floating Rate Securities

Variable and floating rate securities are securities that pay interest at rates that adjust whenever a specified interest rate changes and/or that reset on predetermined dates (such as the last day of a month or a calendar quarter). In addition to senior loans, variable- and floating-rate instruments may include, without limit, instruments such as catastrophe and other event-linked bonds, bank capital securities, unsecured bank loans, corporate bonds, money market instruments and certain types of mortgage-related and other asset-backed securities. The PIMCO Active Bond Exchange-Traded Fund, PIMCO Commodity Strategy Active Exchange-Traded Fund, PIMCO Enhanced Low Duration Active Exchange-Traded Fund, PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund, PIMCO Enhanced Short Maturity Active Exchange-Traded Fund, PIMCO Prime Limited Maturity Active Exchange-Traded Fund, PIMCO Municipal Income Opportunities Active Exchange-Traded Fund, PIMCO Multisector Bond Active Exchange-Traded Fund, PIMCO Preferred and Capital Securities Active Exchange-Traded Fund and PIMCO Senior Loan Active Exchange-Traded Fund may invest in floating rate debt instruments (“floaters”) and engage in credit spread trades. (The PIMCO Ultra Short Government Active Exchange-Traded Fund may invest without limit in the securities described in its 100% and 80% policies that pay fixed, floating, variable or adjustable interest rates). A credit spread trade is an investment position relating to a difference in the prices or interest rates of two bonds or other securities, in which the value of the investment position is determined by changes in the difference between the prices or interest rates as the case may be, of the respective securities. Variable and 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 PIMCO Active Bond Exchange-Traded Fund, PIMCO Commodity Strategy Active Exchange-Traded Fund, PIMCO Enhanced Low Duration Active Exchange-Traded Fund, PIMCO Enhanced Short Maturity Active

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ESG Exchange-Traded Fund, PIMCO Enhanced Short Maturity Active Exchange-Traded Fund, PIMCO Municipal Income Opportunities Active Exchange-Traded Fund, PIMCO Multisector Bond Active Exchange-Traded Fund, PIMCO Preferred and Capital Securities Active Exchange-Traded Fund and PIMCO Senior Loan Active Exchange-Traded Fund may also invest in inverse floating rate debt instruments (“inverse floaters”). An inverse floater may exhibit greater price volatility than a fixed rate obligation of similar credit quality. Additionally, a Fund may also invest, without limitation, in residual interest bonds. Residual interest bonds are a type of inverse floater. See “Municipal Bonds.”

Inflation-Indexed Bonds

Inflation-indexed bonds (other than municipal inflation-indexed bonds and certain corporate inflation-indexed bonds, which are more fully described below) are fixed income securities whose principal value is periodically adjusted according to the rate of inflation. If the index measuring inflation falls, the principal value of inflation-indexed bonds (other than municipal inflation-indexed bonds and certain corporate inflation-indexed bonds) will be adjusted downward, and consequently the interest payable on these securities (calculated with respect to a smaller principal amount) will be reduced. Repayment of the original bond principal upon maturity (as adjusted for inflation) is guaranteed in the case of TIPS. For bonds that do not provide a similar guarantee, the adjusted principal value of the bond repaid at maturity may be less than the original principal.

TIPS may also be divided into individual zero-coupon instruments for each coupon or principal payment (known as “iSTRIPS”). An iSTRIP of the principal component of a TIPS issue will retain the embedded deflation floor that will allow the holder of the security to receive the greater of the original principal or inflation-adjusted principal value at maturity. iSTRIPS may be less liquid than conventional TIPS because they are a small component of the TIPS market.

Municipal inflation-indexed securities are municipal bonds that pay coupons based on a fixed rate plus the Consumer Price Index for All Urban Consumers (“CPI”). With regard to municipal inflation-indexed bonds and certain corporate inflation-indexed bonds, the inflation adjustment is typically reflected in the semi-annual coupon payment. As a result, the principal value of municipal inflation-indexed bonds and such corporate inflation-indexed bonds does not adjust according to the rate of inflation. At the same time, the value of municipal inflation-indexed securities and such corporate inflation-indexed securities generally will not increase if the rate of inflation decreases. Because municipal inflation-indexed securities and corporate inflation-indexed securities are a small component of the municipal bond and corporate bond markets, respectively, they may be less liquid than conventional municipal and corporate bonds.

The value of inflation-indexed bonds is expected to change in response to changes in real interest rates. Real interest rates are tied to the relationship between nominal interest rates and the rate of inflation. If nominal interest rates increase at a faster rate than inflation, real interest rates may rise, leading to a decrease in value of

inflation-indexed bonds. Any increase in the principal amount of an inflation-indexed bond will be considered taxable ordinary income, even though investors do not receive their principal until maturity.

Event-Linked Exposure

The PIMCO Active Bond Exchange-Traded Fund, PIMCO Commodity Strategy Active Exchange-Traded Fund, PIMCO Enhanced Low Duration Active Exchange-Traded Fund, PIMCO Multisector Bond Active Exchange-Traded Fund, PIMCO Preferred and Capital Securities Active Exchange-Traded Fund and PIMCO Senior Loan Active Exchange-Traded Fund may obtain event-linked exposure by investing in “event-linked bonds” or “event-linked swaps” or by implementing “event-linked strategies.” Event-linked exposure results in gains or losses that typically are contingent, or formulaically related to defined trigger events. Examples of trigger events include hurricanes, earthquakes, weather-related phenomena, or statistics related to such events. Some event-linked bonds are commonly referred to as “catastrophe bonds.” If a trigger event occurs, a Fund may lose a portion of or its entire principal invested in the bond or notional amount on a swap. Event-linked exposures often provide for an extension of maturity to process and audit loss claims where a trigger event has, or possibly has, occurred. An extension of maturity may increase volatility. Event-linked exposure may also expose a Fund to certain unanticipated risks including credit risk, counterparty risk, adverse regulatory or jurisdictional interpretations, and adverse tax consequences. Event-linked exposures may also be subject to liquidity risk.

Convertible and Equity Securities

Common stock represents equity ownership in a company and typically provides the common stockholder the power to vote on certain corporate actions, including the election of the company’s directors. Common stockholders participate in company profits through dividends and, in the event of bankruptcy, distributions, on a pro-rata basis after other claims are satisfied. Many factors affect the value of common stock, including earnings, earnings forecasts, corporate events and factors impacting the issuer’s industry and the market generally. Common stock generally has the greatest appreciation and depreciation potential of all corporate securities.

The PIMCO Active Bond Exchange-Traded Fund, PIMCO Commodity Strategy Active Exchange-Traded Fund, PIMCO Enhanced Low Duration Active Exchange-Traded, PIMCO Multisector Bond Active Exchange-Traded Fund, PIMCO Preferred and Capital Securities Active Exchange-Traded Fund and PIMCO Senior Loan Active Exchange-Traded Fund may invest in convertible securities and equity securities, as well as securities related to equities. Equity-related securities include securities having an equity component (e.g., hybrids, bank capital) and equity derivatives. The PIMCO Active Bond Exchange-Traded Fund, PIMCO Enhanced Low Duration Active Exchange-Traded Fund, PIMCO Preferred and Capital Securities Active Exchange-Traded Fund and PIMCO Senior Loan Active Exchange-Traded Fund may not purchase common stock of operating companies, but this limitation does not prevent the Fund from holding common stock obtained through the conversion of convertible

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securities or common stock that is received as part of a corporate reorganization or debt restructuring (for example, as may occur during bankruptcies or distressed situations).

The PIMCO Preferred and Capital Securities Active Exchange-Traded Fund may invests in preferred securities, convertible securities and other equity-related securities. The PIMCO Enhanced Low Duration Active Exchange-Traded Fund may invest a de minimis amount of its total assets (i.e., less than 5% of its total assets) in preferred securities, convertible securities and other equity-related securities. Convertible securities are generally preferred securities and other securities, including fixed income securities and warrants, that are convertible into or exercisable for common stock at a stated price or rate. The price of a convertible security will normally vary in some proportion to changes in the price of the underlying common stock because of this conversion or exercise feature. However, the value of a convertible security may not increase or decrease as rapidly as the underlying common stock. A convertible security will normally also provide income and is subject to interest rate risk. Convertible securities may be lower-rated securities subject to greater levels of credit risk. A Fund may be forced to convert a security before it would otherwise choose, which may have an adverse effect on the Fund’s ability to achieve its investment objective.

“Synthetic” convertible securities are selected based on the similarity of their economic characteristics to those of a traditional convertible security due to the combination of separate securities that possess the two principal characteristics of a traditional convertible security, i.e., an income-producing security (“income-producing component”) and the right to acquire an equity security (“convertible component”). The income-producing component is achieved by investing in non-convertible, income-producing securities such as bonds, preferred securities and money market instruments, which may be represented by derivative instruments. The convertible component is achieved by investing in securities or instruments such as warrants or options to buy common stock at a certain exercise price, or options on a stock index. A simple example of a synthetic convertible security is the combination of a traditional corporate bond with a warrant to purchase equity securities of the issuer of the bond. A Fund may also purchase synthetic securities created by other parties, typically investment banks, including convertible structured notes. The income-producing and convertible components of a synthetic convertible security may be issued separately by different issuers and at different times.

While some countries or companies may be regarded as favorable investments, pure fixed income opportunities may be unattractive or limited due to insufficient supply, or legal or technical restrictions. In such cases, subject to its applicable investment restrictions, a Fund may consider convertible securities or equity securities to gain exposure to such investments. A Fund may invest in equity securities of issuers in commodity related industries. When investing directly in equity securities, a Fund will not be limited to only those equity securities with any particular weighting in such Fund’s respective benchmark index, if any. At times, in connection with the restructuring of a preferred security or Fixed Income Instrument either outside of bankruptcy court or in the context of bankruptcy court proceedings, a Fund may determine or be

required to accept equity securities, such as common stocks, in exchange for all or a portion of a preferred security or Fixed Income Instrument. Depending upon, among other things, PIMCO’s evaluation of the potential value of such securities in relation to the price that could be obtained by a Fund at any given time upon sale thereof, a Fund may determine to hold such securities in its portfolio. Equity securities generally have greater price volatility than fixed income securities. The market price of equity securities owned by a Fund may go up or down, sometimes rapidly or unpredictably.

Equity securities may decline in value due to factors affecting equity securities markets generally or particular industries represented in those markets. The value of an equity security may also decline for a number of reasons that directly relate to the issuer, such as management performance, financial leverage, and reduced demand for the issuer’s goods or services.

Preferred Securities

Among other risks described in this Prospectus, the following issues are particularly associated with investments in preferred and other senior securities.

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Deferral and Omission of Distributions. Preferred and other senior securities may include features permitting or requiring the issuer to defer or omit distributions. Among other things, such deferral or omission may result in adverse tax consequences for a Fund.

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Limited Voting Rights. Preferred and other senior securities generally do not have voting rights with respect to the issuer unless dividends have been in arrears for certain specified periods of time.

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Liquidity. Preferred and other senior securities may be less liquid than other securities, including common stock and U.S. government securities. As a result, these securities are subject to the risk that they may be unable to be sold at the time desired

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by a Fund or at prices approximating the values at which a Fund is carrying the securities on its books. In addition, over longer periods of time, certain types of preferred or other senior securities may become more scarce or less liquid as a result of legislative changes. Such events may negatively affect the prices of securities held by a Fund, which may result in losses to a Fund.

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Regulatory Changes. Revisions to bank capital requirements by international regulatory bodies, to the extent they are adopted in the United States, may also negatively impact the market for certain preferred or senior securities.

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Special Redemption Rights. An issuer of preferred or other senior securities may redeem the securities prior to a specified date, which may occur due to changes in tax or securities laws or corporate actions. A redemption by the issuer may negatively impact the return of the preferred security.

In the future, preferred or other senior securities may be offered with features different from those described above, and as such, may entail different risks.

Over longer periods of time, certain types of preferred or other senior securities may become more scarce or less liquid as a result of legislative changes. Such events may result in losses to a Fund as the prices of securities it holds may be negatively affected. Revisions to bank capital requirements by international regulatory bodies, to the extent they are adopted in the United States, may also negatively impact the market for certain preferred or senior securities.

Contingent Convertible Securities

Contingent convertible securities (“CoCos”) are a form of hybrid debt security issued primarily by non-U.S. issuers, which have loss absorption mechanisms built into their terms. CoCos have no stated maturity, have fully discretionary coupons and are typically issued in the form of subordinated debt instruments. CoCos generally either convert into equity of the issuer or have their principal written down upon the occurrence of certain triggering events (“triggers”) linked to regulatory capital thresholds or regulatory actions relating to the issuer’s continued viability. In certain scenarios, investors in CoCos may suffer a loss of capital ahead of equity holders or when equity holders do not. There is no guarantee that the Fund will receive a return of principal on CoCos. Any indication that an automatic write-down or conversion event may occur can be expected to have an adverse effect on the market price of CoCos. CoCos are often rated below investment grade and are subject to the risks of high yield securities.

Because CoCos are issued primarily by financial institutions, CoCos may present substantially increased risks at times of financial turmoil, which could affect financial institutions more than companies in other sectors and industries. Further, the value of an investment in CoCos is unpredictable and will be influenced by many factors and risks, including interest rate risk, credit risk, market risk and liquidity risk. An investment by the Fund in CoCos may result in losses to the Fund.

Some additional risks associated with CoCos include, but are not limited to:

Loss absorption risk. CoCos may be subject to an automatic write-down (i.e., the automatic write-down of the principal amount or value of the securities, potentially to zero, and the cancellation of the securities) under certain circumstances, which could result in the Fund losing a portion or all of its investment in such securities. In addition, the Fund may not have any rights with respect to repayment of the principal amount of the securities that has not become due or the payment of interest or dividends on such securities for any period from (and including) the interest or dividend payment date falling immediately prior to the occurrence of such automatic write-down. An automatic write-down could also result in a reduced income rate if the dividend or interest payment is based on the security’s par value. In addition, CoCos have fully discretionary coupons. This means coupons can potentially be cancelled at the issuer’s discretion or at the request of the relevant regulatory authority in order to help the issuer absorb losses and may be suspended in the event there are insufficient distributable reserves.

Subordinated instruments. CoCos will, in the majority of circumstances, be issued in the form of subordinated debt instruments in order to provide the appropriate regulatory capital treatment prior to a conversion. Accordingly, in the event of liquidation, dissolution or winding-up of an issuer prior to a conversion having occurred, the rights and claims of the holders of the CoCos, such as the Fund, against the issuer in respect of or arising under the terms of the CoCos shall generally rank junior to the claims of all holders of unsubordinated obligations of the issuer. In addition, if the CoCos are converted into the issuer’s underlying equity securities following a conversion event (i.e., a “trigger”), each holder will be subordinated due to their conversion from being the holder of a debt instrument to being the holder of an equity instrument.

Market value will fluctuate based on unpredictable factors. The trading behavior of a given issuer’s CoCos may be strongly impacted by the trading behavior of other issuers’ CoCos, such that negative information from an unrelated CoCo may cause a decline in value of one or more CoCos held by the Fund. Accordingly, the trading behavior of CoCos may not follow the trading behavior of other similarly structured securities. The value of CoCos is unpredictable and could be influenced by many factors including, without limitation: (i) the creditworthiness of the issuer and/or fluctuations in such issuer’s applicable capital ratios; (ii) supply and demand for the CoCos; (iii) general market conditions and available liquidity; and (iv) economic, financial and political events that affect the issuer, its particular market or the financial markets in general.

Surplus Notes

Surplus notes are debt securities typically issued by mutual insurers that count as statutory capital under insurance regulations. Surplus notes are subordinated to policyholder claims. Coupon payments on surplus notes are contractual and typically cumulative, but each coupon and principal payment requires regulatory approval to ensure that the payment does not deplete resources available for paying policyholder claims.

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Foreign (Non-U.S.) Securities

The PIMCO Active Bond Exchange-Traded Fund, PIMCO Commodity Strategy Active Exchange-Traded Fund, PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund, PIMCO Multisector Bond Active Exchange-Traded Fund, PIMCO Preferred and Capital Securities Active Exchange-Traded Fund and PIMCO Senior Loan Active Exchange-Traded Fund may invest in securities and instruments that are economically tied to foreign (non-U.S.) countries. The PIMCO Enhanced Low Duration Active Exchange-Traded Fund and PIMCO Enhanced Short Maturity Active Exchange-Traded Fund may invest in U.S. dollar-denominated securities and instruments that are economically tied to foreign (non-U.S.) countries. PIMCO generally considers an instrument to be economically tied to a non-U.S. country if the issuer is a foreign (non-U.S.) government (or any political subdivision, agency, authority or instrumentality of such government), or if the issuer is organized under the laws of a non-U.S. country. In the case of money market instruments other than commercial paper and certificates of deposit, such instruments will be considered economically tied to a non-U.S. country if the issuer of such money market instrument is organized under the laws of a non-U.S. country. In the case of commercial paper and certificates of deposit, such instruments will be considered economically tied to a non-U.S. country if the “country of exposure” of such instrument is a non-U.S. country, as determined by the criteria set forth below. With respect to derivative instruments, which each Fund (except the PIMCO Prime Limited Maturity Active Exchange-Traded Fund and PIMCO Ultra Short Government Active Exchange-Traded Fund) may utilize, PIMCO generally considers such instruments to be economically tied to non-U.S. countries if the underlying assets are foreign currencies (or baskets or indexes of such currencies), instruments or securities that are issued by foreign governments, or issuers organized under the laws of a non-U.S. country (or if the underlying assets are money market instruments other than commercial paper and certificates of deposit, if the issuer of such money market instrument is organized under the laws of a non-U.S. country or, in the case of underlying assets that are commercial paper or certificates of deposit, if the “country of exposure” of such money market instrument is a non-U.S. country). A security’s “country of exposure” is determined by PIMCO using certain factors provided by a third-party analytical service provider. The factors are applied in order such that the first factor to result in the assignment of a country determines the “country of exposure.” Both the factors and the order in which they are applied may change in the discretion of PIMCO. The current factors, listed in the order in which they are applied, are: (i) if an asset-backed or other collateralized security, the country in which the collateral backing the security is located; (ii) the “country of risk” of the issuer; (iii) if the security is guaranteed by the government of a country (or any political subdivision, agency, authority or instrumentality of such government), the country of the government or instrumentality providing the guarantee; (iv) the “country of risk” of the issuer’s ultimate parent; or (v) the country where the issuer is organized or incorporated under the laws thereof. “Country of risk” is a separate four-part test determined by the following factors, listed in order of

importance: (i) management location; (ii) country of primary listing; (iii) sales or revenue attributable to the country; and (iv) reporting currency of the issuer.

Investing in foreign (non-U.S.) securities involves special risks and considerations not typically associated with investing in U.S. securities. Investors should consider carefully the substantial risks involved for funds that invest in securities issued by foreign companies and governments of foreign countries. These risks include: differences in accounting, auditing and financial reporting standards; generally higher commission rates on foreign portfolio transactions; the possibility of the imposition of sanctions and other similar measures, nationalization, expropriation or confiscatory taxation; adverse changes in investment or exchange control regulations; market disruptions; the possibility of security suspensions; and political instability. Individual foreign (non-U.S.) economies may differ favorably or unfavorably from the U.S. economy in such respects as growth of gross domestic product, rates of inflation, capital reinvestment, resources, self-sufficiency and balance of payments position. Other countries’ financial infrastructure or settlement systems may be less developed than those of the United States. The securities markets, values of securities, yields and risks associated with foreign (non-U.S.) securities markets may change independently of each other. Also, foreign (non-U.S.) securities and dividends and interest payable on those securities may be subject to foreign taxes, including taxes withheld from payments on those securities. Foreign (non-U.S.) securities often trade with less frequency and volume than domestic securities and therefore may exhibit greater price volatility. Investments in foreign (non-U.S.) securities may also involve higher custodial costs than domestic investments and additional transaction costs with respect to foreign currency conversions. Changes in, or uncertainty concerning, foreign exchange rates also will affect the value of securities denominated or quoted in foreign currencies and in some cases could lead to uncertainty regarding the reliability of issuers’ financial reporting.

Certain Funds also may invest in sovereign debt issued by governments, their agencies or instrumentalities, or other government-related entities.

Holders of sovereign debt may be requested to participate in the rescheduling of such debt and to extend further loans to governmental entities. In addition, there is no bankruptcy proceeding by which defaulted sovereign debt may be collected.

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Emerging Market Securities. The PIMCO Active Bond Exchange-Traded Fund may invest up to 15% of its total assets in securities and instruments that are economically tied to emerging market countries. The PIMCO Commodity Strategy Active Exchange- Traded Fund and PIMCO Multisector Bond Active Exchange-Traded Fund may invest in securities and instruments that are economically tied to emerging market countries. The PIMCO Enhanced Low Duration Active Exchange-Traded Fund may invest up to 10% of its total assets in securities and instruments that are economically tied to emerging market countries. The PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund and PIMCO Enhanced Short Maturity Active Exchange-Traded Fund may invest up to 5% of their total

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assets in U.S. dollar-denominated securities and instruments that are economically tied to developing (or “emerging market”) countries. The PIMCO Preferred and Capital Securities Active Exchange-Traded Fund may invest without limit in securities and instruments that are economically tied to emerging market countries, but will normally limit its emerging markets exposure to 10% of its total assets. The PIMCO Senior Loan Active Exchange-Traded Fund may invest up to 5% of its total assets in securities and instruments that are economically tied to emerging market countries (this limitation does not apply to investment grade sovereign debt denominated in the local currency with less than 1 year remaining to maturity, which means the Fund may invest, together with any other investments denominated in foreign currencies, up to 20% of its total assets in such instruments). PIMCO generally considers an instrument to be economically tied to an emerging market country if: the issuer is organized under the laws of an emerging market country; the currency of settlement of the security is a currency of an emerging market country; the security is guaranteed by the government of an emerging market country (or any political subdivision, agency, authority or instrumentality of such government); for an asset-backed or other collateralized security, the country in which the collateral backing the security is located is an emerging market country; or the security’s “country of exposure” is an emerging market country, as determined by the criteria set forth below. With respect to derivative instruments for each Fund (except the PIMCO Prime Limited Maturity Active Exchange-Traded Fund and PIMCO Ultra Short Government Active Exchange-Traded Fund), PIMCO generally considers such instruments to be economically tied to emerging market countries if the underlying assets are currencies of emerging market countries (or baskets or indexes of such currencies), or instruments or securities that are issued or guaranteed by governments of emerging market countries or by entities organized under the laws of emerging market countries or if an instrument’s “country of exposure” is an emerging market country. A security’s “country of exposure” is determined by PIMCO using certain factors provided by a third-party analytical service provider. The factors are applied in order such that the first factor to result in the assignment of a country determines the “country of exposure.” Both the factors and the order in which they are applied may change in the discretion of PIMCO. The current factors, listed in the order in which they are applied, are: (i) if an asset-backed or other collateralized security, the country in which the collateral backing the security is located; (ii) the “country of risk” of the issuer; (iii) if the security is guaranteed by the government of a country (or any political subdivision, agency, authority or instrumentality of such government), the country of the government or instrumentality providing the guarantee; (iv) the “country of risk” of the issuer’s ultimate parent; or (v) the country where the issuer is organized or incorporated under the laws thereof. “Country of risk” is a separate four-part test determined by the following factors, listed in order of importance:

(i) management location; (ii) country of primary listing; (iii) sales or revenue attributable to the country; and (iv) reporting currency of the issuer. PIMCO has broad discretion to identify countries that it considers to qualify as emerging markets. In making investments in emerging market securities, a Fund emphasizes those countries with relatively low gross national product per capita and with the potential for rapid economic growth. Emerging market countries are generally located in Asia, Africa, the Middle East, Latin America and Eastern Europe. PIMCO will select the country and currency composition based on its evaluation of relative interest rates, inflation rates, exchange rates, monetary and fiscal policies, trade and current account balances, legal and political developments and any other specific factors it believes to be relevant.

Investing in emerging market securities imposes risks different from, or greater than, risks of investing in domestic securities or in foreign, developed countries. These risks include: smaller market capitalization of securities markets, which may suffer periods of relative illiquidity; significant price volatility; restrictions on foreign investment; possible repatriation of investment income and capital. In addition, foreign investors may be required to register the proceeds of sales; future economic or political crises could lead to the imposition of sanctions and other similar measures, price controls, forced mergers, expropriation or confiscatory taxation, seizure, nationalization, or creation of government monopolies. The currencies of emerging market countries may experience significant declines against the U.S. dollar, and devaluation may occur subsequent to investments in these currencies by a Fund. Many emerging market countries 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 and securities markets of certain emerging market countries.

Additional risks of emerging market securities may include: greater social, economic and political uncertainty and instability; more substantial governmental involvement in the economy; less governmental supervision and regulation; unavailability of currency hedging techniques; companies that are newly organized and small; differences in auditing and financial reporting standards, which may result in unavailability of material information about issuers; and less developed legal systems. In addition, emerging securities markets may have different clearance and settlement procedures, which may be unable to keep pace with the volume of securities transactions or otherwise make it difficult to engage in such transactions. Settlement problems may cause a Fund to miss attractive investment opportunities, hold a portion of its assets in cash pending investment, or be delayed in disposing of a portfolio security. Such a delay could result in possible liability to a purchaser of the security.

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Investments in Russia. Certain Funds may have investments in securities and instruments that are economically tied to Russia. Investments in Russia are subject to various risks such as, but not limited to, political, economic, legal, market and currency risks, as discussed in the preceding “Emerging Market Securities” sub-section and in the “Investments in Russia” sub-section in the SAI. The risks include uncertain political and economic policies, short-term market volatility, poor accounting standards, corruption and crime, an inadequate regulatory system, regional armed conflict and unpredictable taxation. Investments in Russia are particularly subject to the risk that further economic sanctions, export and import controls, and other similar measures may be imposed by the United States and/or other countries. Other similar measures may include, but are not limited to, banning or expanding bans on Russia or certain persons or entities associated with Russia from global payment systems that facilitate cross-border payments, restricting the settlement of securities transactions by certain investors and freezing Russian assets or those of particular countries, entities or persons with ties to Russia (e.g., Belarus). Such sanctions and other similar measures – which may impact companies in many sectors, including energy, financial services, technology, accounting, quantum computing, shipping, aviation, metals and mining, defense, architecture, engineering, construction, manufacturing, and transportation, among others – and Russia’s countermeasures may negatively impact the Fund’s performance and/or ability to achieve its investment objective. For example, certain investments may be prohibited and/or existing investments may become illiquid (e.g., in the event that transacting in certain existing investments is prohibited securities markets close, or market participants cease transacting in certain investments in light of geopolitical events, sanctions or related considerations), which could render any such securities held by a Fund unmarketable for an indefinite period of time and/or cause the Fund to sell portfolio holdings at a disadvantageous time or price or continue to hold investments that Fund no longer seeks to hold. In addition, such sanctions or other similar measures, and the Russian government's response, could result in a downgrade of Russia's credit rating or of securities of issuers located in or economically tied to Russia, devaluation of Russia's currency and/or increased volatility with respect to Russian securities and the ruble. Moreover, disruptions caused by Russian military action or other actions (including cyberattacks, espionage or other asymmetric measures) or resulting actual or threatened responses to such activity may impact Russia's economy and Russian and other issuers of securities in which a Fund is invested. Such resulting actual or threatened responses may include, but are not limited to, purchasing and financing restrictions, withdrawal of financial intermediaries, boycotts or changes in consumer or purchaser preferences, sanctions, export and import controls, tariffs or cyberattacks on the Russian government, Russian companies or Russian individuals, including politicians. Any actions by Russia made in response to such sanctions or

retaliatory measures could further impair the value and liquidity of Fund investments. Sanctions and other similar measures have resulted in defaults on debt obligations by certain corporate issuers and the Russian Federation that could lead to cross-defaults or cross-accelerations on other obligations of these issuers.

The Russian securities market is characterized by limited volume of trading, resulting in difficulty in obtaining accurate prices and trading. These issues can be magnified as a result of sanctions and other similar measures that may be imposed and the Russian government's response. The Russian securities market, as compared to U.S. markets, has significant price volatility, less liquidity, a smaller market capitalization and a smaller number of traded securities. There may be little publicly available information about issuers. Settlement, clearing and registration of securities transactions are subject to risks. Prior to the implementation of the National Settlement Depository (“NSD”), a recognized central securities depository, there was no central registration system for equity share registration in Russia, and registration was carried out by either the issuers themselves or by registrars located throughout Russia. Title to Russian equities held through the NSD is now based on the records of the NSD and not the registrars. Although the implementation of the NSD has enhanced the efficiency and transparency of the Russian securities market, issues resulting in loss can still occur. In addition, sanctions by the European Union against the NSD, as well as the potential for sanctions by other governments, could make it more difficult to conduct or confirm transactions involving Russian securities Ownership of securities issued by Russian companies that are not held through depositories such as the NSD may be recorded by companies themselves and by registrars. Moreover, changes in Russian laws and regulations could require the transfer of securities from the NSD to registrars or other parties outside of standard custodial arrangements. In such cases, the risk is increased that a Fund could lose ownership rights through fraud, negligence or oversight. While applicable Russian regulations impose liability on registrars for losses resulting from their errors, it may be difficult for the Fund to enforce any rights it may have against the registrar or issuer of the securities in the event of loss of share registration. In addition, issuers and registrars are still prominent in the validation and approval of documentation requirements for corporate action processing in Russia. Because the documentation requirements and approval criteria vary between registrars and issuers, there remain unclear and inconsistent market standards in the Russian market with respect to the completion and submission of corporate action elections. In addition, sanctions or Russian countermeasures may prohibit or limit a Fund's ability to participate in corporate actions, and therefore require the Fund to forego voting on or receiving funds that would otherwise be beneficial to the Fund. To the extent that a Fund suffers a loss relating to title or corporate actions relating to its portfolio securities, it may be difficult for the Fund to enforce

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its rights or otherwise remedy the loss. Russian securities laws may not recognize foreign nominee accounts held with a custodian bank, and therefore the custodian may be considered the ultimate owner of securities they hold for their clients. Adverse currency exchange rates are a risk and there may be a lack of available currency hedging instruments. Investments in Russia may be subject to the risk of nationalization or expropriation of assets. Oil, natural gas, metals, minerals and timber account for a significant portion of Russia’s exports, leaving the country vulnerable to swings in world prices, and to sanctions or other actions that may be directed at the Russian economy as a whole or at Russian oil, natural gas, metals, minerals or timber industries.

Foreign (Non-U.S.) Currencies

Direct investments in foreign (non-U.S.) currencies or in securities that trade in, or receive revenues in, foreign (non-U.S.) currencies and will be subject to currency risk. Foreign currency exchange rates may fluctuate significantly over short periods of time. They generally are determined by supply and demand in the foreign exchange markets and the relative merits of investments in different countries, actual or perceived changes in interest rates and other complex factors. Currency exchange rates also can be affected unpredictably by intervention (or the failure to intervene) by U.S. or foreign (non-U.S.) governments or central banks, or by currency controls or political developments. Currencies in which a Fund’s assets are denominated may be devalued against the U.S. dollar, resulting in a loss to the Fund.

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Foreign Currency Transactions. The PIMCO Active Bond Exchange-Traded Fund, PIMCO Commodity Strategy Active Exchange-Traded Fund, PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund, PIMCO Multisector Bond Active Exchange-Traded Fund, PIMCO Preferred and Capital Securities Active Exchange-Traded Fund and PIMCO Senior Loan Active Exchange-Traded Fund may invest in securities denominated in foreign (non-U.S.) currencies, engage in foreign currency transactions on a spot (cash) basis and enter into forward foreign currency exchange contracts. The PIMCO Active Bond Exchange-Traded Fund, PIMCO Commodity Strategy Active Exchange-Traded Fund, PIMCO Multisector Bond Active Exchange-Traded Fund, PIMCO Preferred and Capital Securities Active Exchange-Traded Fund and PIMCO Senior Loan Active Exchange-Traded Fund may invest in foreign currency futures contracts and options on foreign currencies and futures. A forward foreign currency exchange contract, which involves an obligation to purchase or sell a specific currency at a future date at a price set at the time of the contract, reduces a Fund’s exposure to changes in the value of the currency it will deliver and increases its exposure to changes in the value of the currency it will receive for the duration of the contract. Certain foreign currency transactions may also be settled in cash rather than the actual delivery of the relevant currency. The effect on the value of a Fund is similar to selling securities denominated in one currency and purchasing securities denominated in another currency. Foreign currency transactions, like currency exchange rates, can be

affected unpredictably by intervention (or the failure to intervene) by U.S. or foreign governments or central banks, or by currency controls or political developments. Such events may prevent or restrict a Fund’s ability to enter into foreign currency transactions, force the Fund to exit a foreign currency transaction at a disadvantageous time or price or result in penalties for the Fund, any of which may result in a loss to the Fund. A contract to sell a foreign currency would limit any potential gain that might be realized if the value of the hedged currency increases. A Fund may enter into these contracts to hedge against foreign exchange risk, to increase exposure to a foreign currency or to shift exposure to foreign currency fluctuations from one currency to another. Suitable hedging transactions may not be available in all circumstances and there can be no assurance that a Fund will engage in such transactions at any given time or from time to time. Also, such transactions may not be successful and may eliminate any chance for a Fund to benefit from favorable fluctuations in relevant foreign currencies. A Fund may use one currency (or a basket of currencies) to hedge against adverse changes in the value of another currency (or a basket of currencies) when exchange rates between the two currencies are positively correlated.

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Redenomination. Uncertainty as to the status of the euro and the European Monetary Union (the “EMU”) has at times created significant volatility in currency and financial markets generally. Any partial or complete dissolution of the EMU could have significant adverse effects on currency and financial markets and on the values of a Fund’s portfolio investments. If one or more EMU countries were to stop using the euro as its primary currency, a Fund’s investments in such countries may be redenominated into a different or newly adopted currency. As a result, the value of those investments could decline significantly and unpredictably. In addition, securities or other investments that are redenominated may be subject to currency risk, liquidity risk and risk of improper valuation to a greater extent than similar investments currently denominated in euros. To the extent a currency used for redenomination purposes is not specified in respect of certain EMU-related investments, or should the euro cease to be used entirely, the currency in which such investments are denominated may be unclear, making such investments particularly difficult to value or dispose of. A Fund may incur additional expenses to the extent it is required to seek judicial or other clarification of the denomination or value of such securities. There can be no assurance that if a Fund earns income or capital gains in a non-U.S. country or PIMCO otherwise seeks to withdraw the Fund’s investments from a given country, capital controls imposed by such country will not prevent, or cause significant expense, or delay in, doing so.

Repurchase Agreements

Each Fund may enter into repurchase agreements, in which the Fund purchases a security from a bank or broker-dealer that agrees to repurchase the security at the Fund’s cost plus interest within a specified

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time. If the party agreeing to repurchase should default, the Fund will seek to sell the securities which it holds. This could involve procedural costs or delays in addition to a loss on the securities if their value should fall below their repurchase price. The security subject to a repurchase agreement may be or become illiquid. These events could also trigger adverse tax consequences for the Fund.

Reverse Repurchase Agreements, Dollar Rolls and Other Borrowings

Each Fund may enter into reverse repurchase agreements and dollar rolls, subject to the Fund’s limitations on borrowings. A reverse repurchase agreement involves the sale of a security by a Fund and its agreement to repurchase the instrument at a specified time and price. A dollar roll is similar except that the counterparty is not obligated to return the same securities as those originally sold by the Fund but only securities that are “substantially identical.” Reverse repurchase agreements and dollar rolls may be considered borrowing for some purposes. Reverse repurchase agreements, dollar rolls and other forms of borrowings may create leveraging risk for a Fund.

Each Fund may borrow money to the extent permitted under the 1940 Act. This means that, in general, a Fund may borrow money from banks for any purpose in an amount up to 1∕3 of the Fund’s total assets, less all liabilities and indebtedness not represented by senior securities. A Fund may also borrow money for temporary administrative purposes in an amount not to exceed 5% of the Fund’s total assets. In addition, a Fund may borrow from certain other PIMCO funds in inter-fund lending transactions to the extent permitted by an exemptive order from the SEC.

Derivatives

Each Fund (except the PIMCO Prime Limited Maturity Active Exchange-Traded Fund and PIMCO Ultra Short Government Active Exchange-Traded Fund) may, but is not required to, use derivatives and other similar instruments (referred to collectively as “derivatives”) for risk management purposes or as part of its investment strategies. Additionally, a Fund may invest in futures and other derivatives that provide equity exposures, including for equitization and hedging purposes using derivatives that provide exposure that is not identical to the instruments or markets in which the Fund seeks to invest at least 80% of its assets, as applicable. Investments in derivatives may take the form of buying and/or writing (selling) derivatives. Generally, derivatives are financial contracts whose value depends upon, or is derived from, the value of an underlying asset, reference rate or index, and may relate to stocks, bonds, interest rates, spreads between different interest rates, currencies or currency exchange rates, commodities, and related indexes. Examples of derivative instruments include options contracts, futures contracts, options on futures contracts and swap agreements (including, but not limited to, credit default swaps and swaps on ETFs). Each Fund may invest some or all of its assets in derivative instruments, subject to the Fund’s objective and policies. A portfolio manager may decide not to employ any of these strategies and there is no assurance

that any derivatives strategy used by a Fund will succeed. A description of these and other derivative instruments that the Funds may use are described under “Investment Objectives and Policies” in the SAI.

A Fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other more traditional investments. Certain derivative transactions may have a leveraging effect on a Fund. For example, a small investment in a derivative instrument may have a significant impact on a Fund’s exposure to interest rates, currency exchange rates or other investments. As a result, a relatively small price movement in a derivative instrument may cause an immediate and substantial loss or gain. A Fund may engage in such transactions regardless of whether the Fund owns the asset, instrument or components of the index underlying the derivative instrument. A Fund may invest a significant portion of its assets in these types of instruments. If it does, the Fund’s investment exposure could far exceed the value of its portfolio securities and its investment performance could be primarily dependent upon securities it does not own. A description of various risks associated with particular derivative instruments is included in “Investment Objectives and Policies” in the SAI. The following provides a more general discussion of important risk factors relating to all derivative instruments that may be used by the Funds.

CPI Swap. A CPI swap is a fixed maturity, OTC derivative transaction in which the investor receives the “realized” rate of inflation as measured by the CPI over the life of the swap. The investor in turn pays a fixed annualized rate over the life of the swap. This fixed rate is often referred to as the “breakeven inflation” rate and is generally representative of the difference between treasury yields and TIPS yields of similar maturities at the initiation of the swap. CPI swaps are typically in “bullet” format, where all cash flows are exchanged at maturity. In addition to counterparty risk, CPI swaps are also subject to inflation risk, where the swap can potentially lose value if the realized rate of inflation over the life of the swap is less than the fixed market implied inflation rate (fixed breakeven rate) that the investor agrees to pay at the initiation of the swap.

Management Risk. Derivative products are highly specialized instruments that require investment techniques and risk analyses different from those associated with stocks and bonds. The use of a derivative requires an understanding not only of the underlying instrument but also of the derivative itself, without the benefit of observing the performance of the derivative under all possible market conditions.

Counterparty Risk (including Credit Risk). The use of certain derivative instruments involves the risk that a loss may be sustained as a result of the failure of another party to the contract (usually referred to as a “counterparty”) to make required payments or otherwise comply with the contract’s terms. Additionally, a short position in a credit default swap could result in losses if the Fund does not correctly evaluate the creditworthiness of the company on which the credit default swap is based. Counterparty risk also refers to the risks of having concentrated exposure to a counterparty.

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Market and Fund Liquidity Risk. Liquidity risk exists when a particular derivative instrument is difficult to purchase or sell. If a derivative transaction is particularly large or if the relevant market is illiquid (as is the case with many privately negotiated derivatives), it may not be possible to initiate a transaction or liquidate a position at an advantageous time or price. Liquidity risk also refers to the risk that a Fund may be required to hold additional cash or sell other investments in order to obtain cash to close out derivatives or meet the liquidity demands that derivatives can create to make payments of margin, collateral, or settlement payments to counterparties. A Fund may have to sell a security at a disadvantageous time or price to meet such obligations.

Leverage Risk. Because many derivatives have a leverage component, adverse changes in the value or level of the underlying asset, reference rate or index could result in a loss substantially greater than the amount invested in the derivative itself. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. When a Fund uses derivatives for leverage, investments in that Fund will tend to be more volatile, resulting in larger gains or losses in response to market changes. Leveraging transactions pursued by a Fund may increase its duration and sensitivity to interest rate movements.

Lack of Availability. Because the markets for certain derivative instruments (including markets located in foreign countries) are relatively new and still developing, suitable derivatives transactions may not be available in all circumstances for risk management or other purposes. Upon the expiration of a particular contract, a portfolio manager may wish to retain a Fund’s position in the derivative instrument by entering into a similar contract, but may be unable to do so if the counterparty to the original contract is unwilling to enter into the new contract and no other appropriate counterparty can be found. There is no assurance that a Fund will engage in derivatives transactions at any time or from time to time. A Fund’s ability to use derivatives may also be limited by certain regulatory and tax considerations.

Correlation Risk. In certain cases, the value of derivatives may not correlate perfectly, or at all, with the value of the assets, reference rates or indexes they are designed to closely track. For example, a swap agreement on an ETF would not correlate perfectly with the index upon which the ETF is based because the fund's return is net of fees and expenses. In this regard, many of the Funds offered in this prospectus seek to achieve their investment objectives, in part, by investing in derivatives positions that are designed to closely track the performance (or inverse performance) of an index on a daily basis. However, the overall investment strategies of these Funds are not designed or expected to produce returns which replicate the performance (or inverse performance) of the particular index, and the degree of variation could be substantial, particularly over longer periods. There are a number of factors which may prevent a Fund, or derivatives or other strategies used by a Fund, from achieving a desired correlation (or inverse correlation) with an index. These may include, but are not limited to: (i) the impact of fund fees, expenses and transaction costs, including borrowing and brokerage costs/bid-ask spreads, which are not reflected in index returns; (ii) differences in the timing of daily calculations of the

value of an index and the timing of the valuation of derivatives, securities and other assets held by a Fund and the determination of the NAV of Fund shares; (iii) disruptions or illiquidity in the markets for derivative instruments or securities in which a Fund invests; (iv) a Fund having exposure to or holding less than all of the securities in the underlying index and/or having exposure to or holding securities not included in the underlying index; (v) large or unexpected movements of assets into and out of a Fund (due to share purchases or redemptions, for example), potentially resulting in the Fund being over- or under-exposed to the index; (vi) the impact of accounting standards or changes thereto; (vii) changes to the applicable index that are not disseminated in advance; (viii) a possible need to conform a Fund’s portfolio holdings to comply with investment restrictions or policies or regulatory or tax law requirements; and (ix) fluctuations in currency exchange rates.

For the PIMCO Commodity Strategy Active Exchange-Traded Fund, these factors include the possibility that the Fund’s commodity derivatives positions may have different roll dates, reset dates or contract months than those specified in a particular commodity index.

A Note on the PIMCO Commodity Strategy Active Exchange-Traded Fund.
In light of certain revenue rulings and private letter rulings issued by the IRS, as discussed above under “Tax Consequences—A Note on the PIMCO Commodity Strategy Active Exchange-Traded Fund,“ the Fund will seek to gain exposure to the commodity markets primarily through investments in leveraged or unleveraged commodity index-linked notes, which are derivative debt instruments with principal and/or coupon payments linked to the performance of commodity indices, and through investments in their respective Subsidiary (as discussed below). The Funds may also invest in commodity-linked notes with principal and/or coupon payments linked to the value of particular commodities or commodity futures contracts, or a subset of commodities and commodities futures contracts. These notes are sometimes referred to as “structured notes” because the terms of these notes may be structured by the issuer and the purchaser of the note. The value of these notes will rise or fall in response to changes in the underlying commodity, commodity futures contract, subset of commodities, subset of commodities futures contracts or commodity index. These notes expose the Funds economically to movements in commodity prices. The Fund may also invest in futures contracts on carbon offset credits. A carbon offset credit represents the reduction or removal of a specific amount of carbon dioxide or other greenhouse gas (“GHG”) from the atmosphere.

Market and Other Risks. Like most other investments, derivative instruments are subject to the risk that the market value of the instrument will change in a way detrimental to a Fund’s interest. If a portfolio manager incorrectly forecasts the values of securities, currencies or interest rates or other economic factors in using derivatives for a Fund, the Fund might have been in a better position if it had not entered into the transaction at all. While some strategies involving derivative instruments can reduce the risk of loss, they can also reduce the opportunity for gain or even result in losses by offsetting favorable price movements in other Fund investments. The regulation of the

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derivatives markets has increased over the past several years, and additional future regulation of the derivatives markets may make derivatives more costly, may limit the availability or reduce the liquidity of derivatives, or may otherwise adversely affect the value or performance of derivatives. Any such adverse future developments could impair the effectiveness or raise the costs of a Fund's derivative transactions, or impede the employment of a Fund's derivatives strategies, or adversely affect a Fund's performance. Other risks in using derivatives include the risk of mispricing and/or improper valuation of derivatives. Many derivatives, in particular privately negotiated derivatives, are complex and often valued subjectively. Improper valuations can result in increased cash payment requirements to counterparties or a loss of value to a Fund. Also, the value of derivatives may not correlate perfectly, or at all, with the value of the assets reference rates or indexes they are designed to closely track. For example, a swap agreement on an exchange-traded fund would not correlate perfectly with the index upon which the exchange-traded fund is based because the fund's return is net of fees and expenses. In addition, a Fund's use of derivatives may cause the Fund to realize higher amounts of short-term capital gains (generally taxed at ordinary income tax rates) than if the Fund had not used such instruments.

Operational and Legal Risks. Using derivatives is also subject to operational and legal risks. Operational risk generally refers to risk related to potential operational issues, including documentation issues, settlement issues, systems failures, inadequate controls, and human error. Legal risk generally refers to insufficient documentation, insufficient capacity or authority of counterparty, or legality or enforceability of a contract.

Investments in a Wholly Owned Subsidiary

Investments in its Subsidiary are expected to provide the PIMCO Commodity Strategy Active Exchange-Traded Fund with exposure to the commodity markets within the limitations of the Subchapter M of the Code and IRS revenue rulings, as discussed above under “Tax Consequences—A Note on the PIMCO Commodity Strategy Active Exchagne-Traded ETF” It is expected that the Subsidiary will invest primarily in commodity-linked derivative instruments, including swap agreements, commodity options, futures and options on futures, backed by a portfolio of inflation-indexed securities and/or other Fixed Income Instruments. Although the Fund may enter into these commodity-linked derivative instruments directly, the Fund will likely gain exposure to these derivative instruments indirectly by investing in its Subsidiary.

To the extent that PIMCO believes that these commodity-linked derivative instruments are better suited to provide exposure to the commodities market than commodity index-linked notes, the Fund’s investment in its Subsidiary will likely increase. The Subsidiary will also invest in inflation-indexed securities and/or other Fixed Income Instruments, which are intended to serve as margin or collateral for the Subsidiary’s derivatives position, common and preferred securities as well as convertible securities of issuers in commodity-related industries, collateralized debt obligations, event-linked bonds and event-linked swaps.

To the extent that the Fund invests in its Subsidiary, it may be subject to the risks associated with those derivative instruments and other securities, which are discussed elsewhere in this prospectus. While the Subsidiary may be considered similar to an investment company, it is not registered under the 1940 Act and, unless otherwise noted in the prospectus, is not subject to all of the investor protections of the 1940 Act.

In addition, changes in the laws of the United States and/or the Cayman Islands could result in the inability of the Fund and/or the Subsidiary to operate as described in this prospectus and the SAI and could adversely affect the Fund. Changes in the laws of the United States and/or the Cayman Islands could adversely affect the performance of the Fund and/or the Subsidiary and result in the Fund underperforming its benchmark index(es)

Exchange-Traded Notes (ETNs)

ETNs are senior, unsecured, unsubordinated debt securities whose returns are linked to the performance of a particular market benchmark or strategy minus applicable fees. ETNs are traded on an exchange (e.g., the NYSE) during normal trading hours. However, investors can also hold the ETN until maturity. At maturity, the issuer pays to the investor a cash amount equal to the principal amount, subject to the day’s market benchmark or strategy factor.

Delayed Funding Loans and Revolving Credit Facilities

The PIMCO Active Bond Exchange-Traded Fund, PIMCO Commodity Strategy Active Exchange-Traded Fund, PIMCO Enhanced Low Duration Active Exchange-Traded Fund, PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund, PIMCO Enhanced Short Maturity Active Exchange-Traded Fund, PIMCO Municipal Income Opportunities Active Exchange-Traded Fund, PIMCO Multisector Bond Active Exchange-Traded Fund, PIMCO Preferred and Capital Securities Active Exchange-Traded Fund and PIMCO Senior Loan Active Exchange-Traded Fund may also enter into, or acquire participations in, delayed funding loans and revolving credit facilities, in which a lender agrees to make loans up to a maximum amount upon demand by the borrower during a specified term. These commitments may have the effect of requiring the PIMCO Active Bond Exchange-Traded Fund, PIMCO Commodity Strategy Active Exchange-Traded Fund, PIMCO Enhanced Low Duration Active Exchange-Traded Fund, PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund, PIMCO Enhanced Short Maturity Active Exchange-Traded Fund, PIMCO Municipal Income Opportunities Active Exchange-Traded Fund, PIMCO Multisector Bond Active Exchange-Traded Fund, PIMCO Preferred and Capital Securities Active Exchange-Traded Fund and PIMCO Senior Loan Active Exchange-Traded Fund to increase their respective investments in a company at a time when it might not otherwise decide to do so (including at a time when the company’s financial condition makes it unlikely that such amounts will be repaid). Delayed funding loans and revolving credit facilities are subject to credit, interest rate and liquidity risk and the risks of being a lender.

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When-Issued, Delayed Delivery and Forward Commitment Transactions

Each Fund may purchase or sell securities that it is eligible to purchase or sell on a when-issued basis, may purchase or sell such securities for delayed delivery and may make contracts to purchase or sell such securities for a fixed price at a future date beyond normal settlement time (forward commitments). When-issued transactions, delayed delivery purchases and forward commitments involve a risk of loss if the value of the securities declines prior to the settlement date. This risk is in addition to the risk that the Fund’s other assets will decline in value. Therefore, these transactions may result in a form of leverage and increase a Fund’s overall investment exposure. Typically, no income accrues on securities a Fund has committed to purchase prior to the time delivery of the securities is made. When a Fund has sold a security on a when-issued, delayed delivery, or forward commitment basis, the Fund does not participate in future gains or losses with respect to the security. If the other party to a transaction fails to pay for the securities, a Fund could suffer a loss. Additionally, when selling a security on a when-issued, delayed delivery or forward commitment basis without owning the security, a Fund will incur a loss if the security’s price appreciates in value such that the security’s price is above the agreed-upon price on the settlement date.

Investment in Other Funds

Each Fund may invest in securities of other investment companies, such as open-end or closed-end management investment companies, including ETFs, which may include investment companies advised by PIMCO or another investment adviser, or in pooled accounts or other unregistered accounts or investment vehicles to the extent permitted by the 1940 Act, the rules and regulations thereunder or any exemptive relief therefrom. A Fund may invest in other investment companies to gain broad market or sector exposure, including during periods when it has large amounts of uninvested cash or when PIMCO believes share prices of other investment companies offer attractive values. The limitation described in the foregoing sentence shall not apply to the PIMCO Commodity Strategy Active Exchange-Traded Fund’s investment in its Subsidiary. As a shareholder of an investment company or other pooled vehicle, a Fund may indirectly bear investment advisory fees, supervisory and administrative fees, service fees and other fees which are in addition to the fees the Fund pays its service providers. Although the PIMCO Ultra Short Government Active Exchange-Traded Fund has adopted a policy to invest 100% of its total assets in cash, U.S. Government Securities, and repurchase agreements secured by U.S. Government Securities or cash, this policy does not preclude the Fund from investing in “government money market funds,” which are money market funds that invest at least 99.5% of their total assets in cash, U.S. Government Securities, and/or repurchase agreements that are collateralized fully. To the extent a Fund invests in other investment companies that are advised by PIMCO, PIMCO expects to select such investments without considering or canvassing the universe of available unaffiliated investment companies.

Subject to the restrictions and limitations of the 1940 Act, and the rules and regulations thereunder and any exemptive relief therefrom, each Fund may, in the future, elect to pursue its investment objective either by investing directly in securities or by investing in one or more underlying investment vehicles or companies that have substantially similar investment objectives and policies as the Fund.

Participation in a cash sweep program where the Fund's uninvested cash balance is used to purchase shares of affiliated or unaffiliated money market funds or cash management pooled investment vehicles at the end of each day subjects the Fund to the risks associated with the underlying money market funds or cash management pooled investment vehicles, including liquidity risk. As a shareholder of a money market fund or cash management pooled investment vehicle, a Fund would indirectly bear the fees and expenses of the underlying fund or account which are in addition to the fees the Fund pays its service providers.

SEC regulations concerning investments by registered investment companies in the securities of other registered investment companies may, among other things, limit a Fund’s investment flexibility. This could adversely impact the Fund’s investment strategies and operations. The“Investment Objectives and Policies – Regulatory Risk” section in the SAI discusses these changes in further detail.

Small-Cap and Mid-Cap Companies

The PIMCO Active Bond Exchange-Traded Fund, PIMCO Commodity Strategy Active Exchange-Traded Fund, PIMCO Enhanced Low Duration Active Exchange-Traded Fund, PIMCO Multisector Bond Active Exchange-Traded Fund, PIMCO Preferred and Capital Securities Active Exchange-Traded Fund and PIMCO Senior Loan Active Exchange-Traded Fund may invest in equity securities of small-capitalization and mid-capitalization companies. The Funds consider a small-cap company to be a company with a market capitalization of up to $1.5 billion and a mid-cap company to be a company with a market capitalization of between $1.5 billion and $10 billion. Investments in small-cap and mid-cap companies involve greater risk than investments in large-capitalization companies. Small- and mid-cap companies may not have an established financial history, which can present valuation challenges. The equity securities of small- and mid-cap companies may be subject to increased market fluctuations, due to less liquid markets and more limited managerial and financial resources. A Fund’s investment in small- and mid-cap companies may increase the volatility of a Fund’s portfolio.

Short Sales

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Prospectus

other institution to complete the sale. Short sales expose a Fund to the risk that it will be required to acquire, convert or exchange securities to replace the borrowed securities (also known as “covering” the short position) at a time when the securities sold short have appreciated in value, thus resulting in a loss to the Fund. A short sale is ”against the box“ to the extent that a Fund contemporaneously owns, or has the right to obtain at no added cost, securities identical to those sold short. A Fund may engage in short selling to the extent permitted by the 1940 Act and rules and interpretations thereunder and other federal securities laws. To the extent a Fund engages in short selling in foreign (non-U.S.) jurisdictions, the Fund will do so to the extent permitted by the laws and regulations of such jurisdiction.

Additional Information Regarding Certain Screens Used by PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund

As noted above, the PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund will not invest in the securities of any non-governmental issuer determined by PIMCO to be engaged principally in (1) manufacture of alcoholic beverages, tobacco products or military equipment, (2) operation of gambling casinos, (3) production or distribution of adult entertainment materials, (4) oil industry, including extraction, production, and refining or (5) production or distribution of coal and coal-fired generation. In analyzing whether an issuer meets any of the criteria described above, PIMCO intends to predominantly rely upon, among other things, information provided by an independent third party. PIMCO may also apply additional screens and exclusions. For example, where an issuer is not covered by a third-party, PIMCO may conduct additional reviews to determine whether an investment is consistent with the philosophy of these screens and/or exclusions.

Illiquid Investments

Each Fund may invest up to 15% of its net assets (taken at the time of investment) in illiquid investments that are assets. Certain illiquid investments may require pricing at fair value as determined in good faith under the supervision of the Board of Trustees. A portfolio manager may be subject to significant delays in disposing of illiquid investments and transactions in illiquid investments may entail registration expenses and other transaction costs that are higher than those for transactions in liquid investments. The term “illiquid investments” for this purpose means investments that a Fund reasonably expects cannot be sold or disposed of in current market conditions in seven calendar days or less without the sale or disposition significantly changing the market value of the investment. Restricted securities, i.e., securities subject to legal or contractual restrictions on resale, may be illiquid. However, some restricted securities (such as securities issued pursuant to Rule 144A under the Securities Act of 1933, as amended, and certain commercial paper) may be treated as liquid (i.e., classified by the Fund in a liquidity category other than “illiquid” pursuant to the Fund's liquidity risk management procedures), although they may be relatively less liquid than registered securities traded on established secondary markets.

Additional discussion of illiquid investments and related regulatory limits and requirements is available under “Investment Objectives and Policies” in the SAI.

Fund Distribution Rates

Although certain Funds may seek to maintain level distributions, such Funds’ distribution rates may be affected by numerous factors, including but not limited to changes in realized and projected market returns, fluctuations in market interest rates, Fund performance, and other factors. There can be no assurance that a change in market conditions or other factors will not result in a change in a Fund’s distribution rate or that the rate will be sustainable in the future.

For instance, during periods of low or declining interest rates, a Fund’s distributable income and dividend levels may decline for many reasons. For example, the Fund may have to deploy uninvested assets (whether from purchases of Fund shares, proceeds from matured, traded or called debt obligations or other sources) in new, lower yielding instruments.

Additionally, payments from certain instruments that may be held by the Fund (such as variable and floating rate securities) may be negatively impacted by declining interest rates, which may also lead to a decline in the Fund’s distributable income and dividend levels.

Loans of Portfolio Securities

For the purpose of achieving income, each Fund may lend its portfolio securities to brokers, dealers, and other financial institutions provided that a number of conditions are satisfied, including that the loan is fully collateralized. Please see “Investment Objectives and Policies” in the SAI for details. When a Fund lends portfolio securities, its investment performance will continue to reflect changes in the value of the securities loaned, and the Fund will also receive a fee or interest on the collateral. Securities lending involves the risk of loss of rights in the collateral or delay in recovery of the collateral if the borrower fails to return the security loaned or becomes insolvent. A Fund may pay lending fees to a party arranging the loan, which may be an affiliate of the Fund. Cash collateral received by a Fund in securities lending transactions may be invested in short-term liquid fixed income instruments or in money market or short-term mutual funds, or similar investment vehicles, including affiliated money market or short-term mutual funds. As a shareholder of an investment company or other pooled vehicle, a Fund may indirectly bear investment advisory fees, supervisory and administrative fees, service fees and other fees which are in addition to the fees the Fund pays its service providers. To the extent such cash collateral is invested in an affiliated money market or short-term mutual fund, such fees generally will not be waived, and PIMCO expects to select such an investment without considering or canvassing the universe of available unaffiliated investment companies. A Fund bears the risk of such investments.

Portfolio Turnover

The length of time a Fund has held a particular security is not generally a consideration in investment decisions. A change in the securities held by a Fund is known as “portfolio turnover.” When the portfolio

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managers deem it appropriate and particularly during periods of volatile market movements, a Fund may engage in frequent and active trading of portfolio securities to achieve its investment objective. To the extent that Creation Unit purchases from and redemptions by a Fund are effected in cash, frequent purchases and redemptions may increase the rate of portfolio turnover. Higher portfolio turnover (e.g., an annual rate greater than 100% of the average value of a Fund’s portfolio) involves correspondingly greater expenses to a Fund, including brokerage commissions or dealer markups and other transaction costs on the sale of securities and reinvestments in other securities. Such sales may also result in realization of taxable capital gains, including short-term capital gains (which are generally taxed at ordinary income tax rates). The trading costs and tax effects associated with portfolio turnover may adversely affect a Fund’s performance. Please see a Fund's “Fund Summary—Portfolio Turnover” or the “Financial Highlights” in this prospectus for the portfolio turnover rates of the Funds that were operational during the last fiscal year. In addition, large movements of cash into or out of a Fund may negatively impact the Fund’s ability to achieve its investment objective or maintain a consistent level of operating expenses.

Temporary Defensive Positions

For temporary defensive purposes, each Fund may invest without limit in U.S. debt securities, including taxable securities and short-term money market securities in attempting to respond to adverse market, economic, political, or other conditions, as determined by PIMCO. When a Fund engages in such strategies, it may not achieve its investment objective.

From time to time, as the prevailing market and interest rate environments warrant, and at the discretion of its portfolio manager, some portion of the PIMCO Ultra Short Government Active Exchange-Traded Fund's total net assets may be uninvested. Such a strategy may be deemed advisable during periods where the interest rate on newly issued U.S. Treasury securities is extremely low, or where no interest rate is paid at all. In such cases, Fund assets will be held in cash in the Fund’s custody account. Cash assets are generally not income-generating and would impact a Fund’s performance.

Changes in Investment Objectives and Policies

The investment objective of each Fund is non-fundamental and may be changed by the Board of Trustees without shareholder approval. Unless otherwise stated, all other investment policies of the Funds may be changed by the Board of Trustees without shareholder approval. In addition, the Trust may determine to cease operating any Fund as an “exchange-traded” fund and cause the Fund's shares to stop trading on a securities exchange.

Percentage Investment Limitations

Unless otherwise stated, all percentage limitations on Fund investments listed in this prospectus will apply at the time of investment. A Fund would not violate these limitations unless an excess or deficiency occurs or exists immediately after and as a result of an investment. Each of the PIMCO Active Bond Exchange-Traded Fund, PIMCO Preferred and Capital Securities Active Exchange-Traded Fund, PIMCO Multisector

Bond Active Exchange-Traded Fund, PIMCO Senior Loan Active Exchange-Traded Fund and PIMCO Ultra Short Government Active Exchange-Traded Fund has adopted a non-fundamental investment policy, and each of the PIMCO Intermediate Municipal Bond Active Exchange-Traded, PIMCO Short Term Municipal Bond Active Exchange-Traded and PIMCO Municipal Income Opportunities Active Exchange-Traded Funds has adopted a fundamental investment policy, to invest at least 80% of its assets in investments suggested by its name. For purposes of this policy, the term “assets” means net assets plus the amount of any borrowings for investment purposes.

Credit Ratings and Unrated Securities

Rating agencies are private services that provide ratings of the credit quality of fixed income securities, including convertible securities. Appendix A to this Prospectus describes the various ratings assigned to fixed income securities by Moody’s, S&P and Fitch. Ratings assigned by a rating agency are not absolute standards of credit quality and do not evaluate market risks. Rating agencies may fail to make timely changes in credit ratings and an issuer’s current financial condition may be better or worse than a rating indicates. A Fund will not necessarily sell a security when its rating is reduced below its rating at the time of purchase. The ratings of a fixed income security may change over time. Moody’s, S&P and Fitch monitor and evaluate the ratings assigned to securities on an ongoing basis. As a result, debt instruments held by a Fund could receive a higher rating or a lower rating during the period in which they are held by a Fund. PIMCO does not rely solely on credit ratings, and develops its own analysis of issuer credit quality.

A Fund may purchase unrated securities (which are not rated by a rating agency) if PIMCO determines, in its sole discretion, that the security is of comparable quality to a rated security that the Fund may purchase. In making ratings determinations, PIMCO may take into account different factors than those taken into account by rating agencies, and PIMCO’s rating of a security may differ from the rating that a rating agency may have given the same security. Unrated securities may be less liquid than comparable rated securities and involve the risk that the portfolio manager may not accurately evaluate the security’s comparative credit rating. Analysis of the creditworthiness of issuers of high yield securities may be more complex than for issuers of higher-quality fixed income securities. To the extent that a Fund invests in high yield and/or unrated securities, the Fund's success in achieving its investment objective may depend more heavily on the portfolio manager's creditworthiness analysis than if the Fund invested exclusively in higher-quality and higher-rated securities.

Other Investments and Techniques

The Funds may invest in other types of securities and use a variety of investment techniques and strategies that are not described in this Prospectus. These securities and techniques may subject the Funds to additional risks. Please see the SAI for additional information about the securities and investment techniques described in this Prospectus and about additional securities and techniques that may be used by the Funds.

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Prospectus

Geopolitical Conflicts

The occurrence of geopolitical conflicts, war or terrorist activities could have adverse impacts on markets in various and unpredictable ways. For example, following Russia’s large-scale invasion of Ukraine in February 2022, Russia, and other countries, persons and entities that were viewed as having provided material aid to Russia’s aggression against Ukraine, became the subject of economic sanctions and import and export controls imposed by countries throughout the world, including the United States. Such measures have had and may continue to have an adverse effect on the Russian, Belarusian and other securities and economies. The extent, duration and impact of geopolitical conflicts and related market impacts are difficult to ascertain, but could be significant and could have significant adverse effects on regional and global economies and the markets for certain securities and commodities, such as oil and natural gas, as well as other sectors, and on a Fund’s investments.

Cyber Security

As the use of technology, including cloud-based technology, has become more prevalent and interconnected in the course of business, the Funds have become potentially more susceptible to operational and information security risks resulting from breaches in cyber security. A breach in cyber security refers to both intentional and unintentional cyber events that may, among other things, cause a Fund to lose proprietary information, suffer data corruption and/or destruction or lose operational capacity, result in the unauthorized release or other misuse of confidential information, or otherwise disrupt normal business operations. Geopolitical tensions can increase the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing, who may desire to use cybersecurity attacks to cause damage or create leverage against geopolitical rivals. Cyber security breaches may involve unauthorized access to the digital information systems that support a Fund (e.g., through “hacking,” ransomware or malicious software coding) or outside attacks such as denial-of-service attacks (i.e., efforts to make network services unavailable to intended users), but may also result from intentionally or unintentionally harmful acts of PIMCO personnel. In addition, cyber security breaches involving third party service providers that provide services to PIMCO or a Fund (including but not limited to vendors, advisers, sub-advisers, administrators, transfer agents, regulatory authorities, custodians, registry operators, distributors and other third parties), trading counterparties and issuers in which a Fund invests can also subject a Fund to many of the same risks associated with direct cyber security breaches. Recently, geopolitical tensions may have increased the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing. PIMCO's use of cloud-based service providers could heighten or change these risks. In addition, work-from-home arrangements by a Fund, PIMCO and its service providers could increase all of the above risks, create additional data and information accessibility concerns, and make a Fund, PIMCO or its service providers susceptible to operational disruptions, any of which could adversely impact their operations.

Cyber security failures or breaches may result in financial losses to a Fund and its shareholders. For example, cyber security failures or breaches involving trading counterparties or issuers in which a Fund invests could adversely impact such counterparties or issuers and cause the Fund’s investments to lose value. These failures or breaches may also result in disruptions to business operations, potentially resulting in financial losses; interference with a Fund’s ability to calculate its NAV, process shareholder transactions or otherwise transact business with shareholders; impediments to trading; violations of applicable privacy and other laws; regulatory fines; penalties; third party claims in litigation; reputational damage; reimbursement or other compensation costs; additional compliance and cyber security risk management costs and other adverse consequences. In addition, substantial costs may be incurred in order to prevent any cyber incidents in the future.

Like with operational risk in general, the Funds have established business continuity plans and risk management systems designed to reduce the risks associated with cyber security. However, there are inherent limitations in these plans and systems, including that certain risks may not have been identified, in large part because different or unknown threats may emerge in the future. As such, there is no guarantee that such efforts will succeed, especially because the Funds do not directly control the cyber security systems of issuers in which a Fund may invest, trading counterparties or third party service providers to the Funds. Such entities have experienced cyber attacks and other attempts to gain unauthorized access to systems from time to time, and there is no guarantee that efforts to prevent or mitigate the effects of such attacks or other attempts to gain unauthorized access will be successful. There is also a risk that cyber security breaches may not be detected. The Funds and their shareholders may suffer losses as a result of a cyber security breach related to the Funds, their service providers, trading counterparties or the issuers in which a Fund invests.

Regulatory Changes Risk

Financial entities, such as investment companies and investment advisers, are generally subject to extensive government regulation and intervention. Government regulation and/or intervention may change the way a Fund is regulated, affect the expenses incurred directly by a Fund and the value of its investments, and limit and/or preclude a Fund’s ability to achieve its investment objective. Government regulation may change frequently and may have significant adverse consequences. The Funds and the investment adviser have historically been eligible for exemptions from certain regulations. However, there is no assurance that the Funds and the investment adviser will continue to be eligible for such exemptions. Actions by governmental entities may also impact certain instruments in which a Fund invests.

Moreover, government regulation may have unpredictable and unintended effects. Legislative or regulatory actions to address perceived liquidity or other issues in fixed income markets generally, or in particular markets such as the municipal securities market, may alter or impair a Fund’s ability to pursue its investment objectives or utilize certain investment strategies and techniques.

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Financial Highlights

The financial highlights table is intended to help a shareholder understand each Fund’s financial performance for the last five fiscal years or, if shorter, the period since a Fund commenced operations. Certain information reflects financial results for a single Fund share. Because the PIMCO Prime Limited Maturity Active Exchange-Traded Fund had not commenced operations during the periods shown, financial performance information is not provided for this Fund. The total returns in the table represent the rate that an investor would have earned or lost on an investment in shares of a Fund (assuming reinvestment of all dividends and distributions). This information has been audited by PricewaterhouseCoopers LLP, whose report, along with each Fund’s financial statements, are included in Form N-CSR filed with the SEC. The financial statements are available free of charge by calling the Trust at the phone number on the back of this prospectus. The financial statements are also available for download free of charge on the Trust’s website at www.pimcoetfs.com. Note: All footnotes to the financial highlights tables appear at the end of the tables.

		Investment Operations			Less Distributions(c)

Selected Per Share Data for the Year or Period Ended^:	Net Asset Value Beginning of Year or Period(a)	Net Investment Income (Loss)(b)	Net Realized/ Unrealized Gain (Loss)	Total	From Net Investment Income	From Net Realized Capital Gains	Tax Basis Return of Capital	Total
PIMCO Active Bond Exchange-Traded Fund
06/30/2024	$91.62	$4.40	$(0.88)	$3.52	$(4.11)	$0.00	$0.00	$(4.11)
06/30/2023	95.16	3.65	(3.80)	(0.15)	(3.39)	0.00	0.00	(3.39)
06/30/2022	111.01	2.52	(15.52)	(13.00)	(2.85)	0.00	0.00	(2.85)
06/30/2021	111.39	2.27	0.16	2.43	(2.81)	0.00	0.00	(2.81)
06/30/2020	107.54	2.88	4.42	7.30	(3.45)	0.00	0.00	(3.45)
PIMCO Enhanced Low Duration Active Exchange-Traded Fund
06/30/2024	$93.86	$4.60	$0.68	$5.28	$(4.15)	$0.00	$(0.20)	$(4.35)
06/30/2023	96.16	3.30	(2.83)	0.47	(2.77)	0.00	0.00	(2.77)
06/30/2022	101.78	1.43	(5.87)	(4.44)	(1.18)	0.00	0.00	(1.18)
06/30/2021	101.79	1.16	0.43	1.59	(1.60)	0.00	0.00	(1.60)
06/30/2020	100.15	2.61	2.06	4.67	(3.03)	0.00	0.00	(3.03)
PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund
06/30/2024	$97.94	$5.10	$0.77	$5.87	$(5.07)	$0.00	$0.00	$(5.07)
06/30/2023	98.43	3.15	0.27	3.42	(3.91)	0.00	0.00	(3.91)
06/30/2022	100.66	0.67	(2.11)	(1.44)	(0.71)	(0.08)	0.00	(0.79)
06/30/2021	100.64	0.74	0.26	1.00	(0.98)	0.00	0.00	(0.98)
12/10/2019 - 06/30/2020	100.00	1.04	0.49	1.53	(0.89)	0.00	0.00	(0.89)
PIMCO Enhanced Short Maturity Active Exchange-Traded Fund
06/30/2024	$99.78	$5.33	$0.81	$6.14	$(5.28)	$0.00	$0.00	$(5.28)
06/30/2023	99.13	3.48	0.49	3.97	(3.32)	0.00	0.00	(3.32)
06/30/2022	101.99	0.67	(2.90)	(2.23)	(0.62)	(0.01)	0.00	(0.63)
06/30/2021	101.65	0.52	0.39	0.91	(0.57)	0.00	0.00	(0.57)
06/30/2020	101.75	2.06	0.15	2.21	(2.31)	0.00	0.00	(2.31)
PIMCO Intermediate Municipal Bond Active Exchange-Traded Fund
06/30/2024	$51.82	$1.78	$0.25	$2.03	$(1.74)	$0.00	$0.00	$(1.74)
06/30/2023	51.56	1.48	0.17	1.65	(1.39)	0.00	0.00	(1.39)
06/30/2022	56.72	0.92	(5.19)	(4.27)	(0.89)	0.00	0.00	(0.89)
06/30/2021	55.73	0.97	1.00	1.97	(0.98)	0.00	0.00	(0.98)
06/30/2020	54.77	1.24	0.96	2.20	(1.24)	0.00	0.00	(1.24)
PIMCO Multisector Bond Active Exchange-Traded Fund
06/30/2024	$25.02	$1.40	$0.46	$1.86	$(1.30)	$0.00	$0.00	$(1.30)
06/21/2023 - 06/30/2023	25.00	0.04	(0.02)	0.02	0.00	0.00	0.00	0.00
PIMCO Municipal Income Opportunities Active Exchange-Traded Fund
06/30/2024	$44.58	$1.85	$0.77	$2.62	$(1.76)	$0.00	$0.00	$(1.76)
06/30/2023	44.06	1.69	0.40	2.09	(1.57)	0.00	0.00	(1.57)
09/08/2021 - 06/30/2022	50.00	0.66	(6.07)	(5.41)	(0.53)	0.00	0.00	(0.53)
PIMCO Preferred and Capital Securities Active Exchange-Traded Fund
06/30/2024	$46.61	$2.71	$3.09	$5.80	$(2.79)	$0.00	$0.00	$(2.79)
01/18/2023 - 06/30/2023	50.00	1.11	(3.69)	(2.58)	(0.81)	0.00	0.00	(0.81)

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Prospectus

		Ratios/Supplemental Data
			Ratios to Average Net Assets(f)
Net Asset Value End of Year or Period(a)	Total Return(d)	Net Assets End of Year or Period (000s)	Expenses	Expenses Excluding Waivers	Expenses Excluding Interest Expense	Expenses Excluding Interest Expense and Waivers	Net Investment Income (Loss)	Portfolio Turnover Rate(e)

$91.03	3.98 %	$4,326,761	0.69 %	0.70 %	0.54 %	0.55 %	4.90 %	351 %
91.62	(0.13 )	3,478,849	0.58	0.58	0.55	0.55	3.93	352
95.16	(11.96 )	3,224,915	0.56	0.56	0.55	0.55	2.37	368
111.01	2.20	4,282,895	0.55	0.55	0.55	0.55	2.04	273
111.39	6.92	3,400,704	0.57	0.57	0.55	0.55	2.65	146

$94.79	5.76 %	$870,154	0.50 %	0.50 %	0.46 %	0.46 %	4.90 %	183 %
93.86	0.51	1,041,832	0.51	0.51	0.46	0.46	3.47	133
96.16	(4.38 )	1,444,341	0.53	0.53	0.46	0.46	1.44	269
101.78	1.57	1,129,706	0.47	0.49	0.44	0.46	1.13	73
101.79	4.77	496,743	0.49	0.56	0.39	0.46	2.61	378

$98.74	6.16 %	$166,877	0.24 %	0.36 %	0.24 %	0.36 %	5.22 %	73 %
97.94	3.56	150,823	0.24	0.36	0.24	0.36	3.20	53
98.43	(1.43 )	184,071	0.25	0.37	0.24	0.36	0.67	75
100.66	0.99	153,000	0.25	0.37	0.25	0.37	0.74	120
100.64	1.54	87,553	0.27 *	0.51 *	0.24 *	0.48 *	1.87 *	102

$100.64	6.33 %	$12,049,316	0.35 %	0.35 %	0.35 %	0.35 %	5.35 %	57 %
99.78	4.09	9,257,897	0.35	0.35	0.35	0.35	3.49	35
99.13	(2.20 )	11,757,526	0.36	0.36	0.35	0.35	0.67	100
101.99	0.89	14,024,433	0.35	0.35	0.35	0.35	0.51	71
101.65	2.21	13,914,440	0.37	0.37	0.35	0.35	2.03	81

$52.11	3.99 %	$1,505,332	0.35 %	0.35 %	0.35 %	0.35 %	3.46 %	29 %
51.82	3.26	981,032	0.35	0.35	0.35	0.35	2.86	47
51.56	(7.63 )	847,128	0.35	0.35	0.35	0.35	1.68	50
56.72	3.56	647,152	0.35	0.35	0.35	0.35	1.72	16
55.73	4.06	468,662	0.35	0.35	0.35	0.35	2.25	34

$25.58	7.66 %	$1,005,834	0.69 %	0.79 %	0.55 %	0.65 %	5.57 %	398 %
25.02	0.08	65,053	0.55 *	0.82 *	0.55 *	0.82 *	4.29 *	20

$45.44	6.05 %	$158,121	0.39 %	0.49 %	0.39 %	0.49 %	4.16 %	39 %
44.58	4.87	74,899	0.39	0.49	0.39	0.49	3.80	84
44.06	(10.89 )	42,296	0.40 *	0.68 *	0.40 *	0.68 *	1.71 *	238

$49.62	12.91 %	$116,116	0.74 %	0.89 %	0.69 %	0.84 %	5.73 %	64 %
46.61	(5.18 )	93,214	0.74 *	1.04 *	0.69 *	0.99 *	5.18 *	22

October 31, 2024 (as supplemented November 20, 2024) | Prospectus 103

PIMCO ETF Trust

		Investment Operations			Less Distributions(c)

Selected Per Share Data for the Year or Period Ended^:	Net Asset Value Beginning of Year or Period(a)	Net Investment Income (Loss)(b)	Net Realized/ Unrealized Gain (Loss)	Total	From Net Investment Income	From Net Realized Capital Gains	Tax Basis Return of Capital	Total
PIMCO Senior Loan Active Exchange-Traded Fund
06/30/2024	$49.87	$4.42	$0.88	$5.30	$(4.08)	$0.00	$0.00	$(4.08)
06/30/2023	48.18	3.93	1.18	5.11	(3.42)	0.00	0.00	(3.42)
06/08/2022 - 06/30/2022	50.00	0.06	(1.88)	(1.82)	0.00	0.00	0.00	0.00
PIMCO Short Term Municipal Bond Active Exchange-Traded Fund
06/30/2024	$49.57	$1.50	$0.31	$1.81	$(1.51)	$0.00	$0.00	$(1.51)
06/30/2023	49.56	1.12	(0.06)	1.06	(1.05)	0.00	0.00	(1.05)
06/30/2022	51.41	0.34	(1.89)	(1.55)	(0.30)	0.00	0.00	(0.30)
06/30/2021	51.04	0.42	0.42	0.84	(0.47)	0.00	0.00	(0.47)
06/30/2020	50.53	0.81	0.51	1.32	(0.81)	0.00	0.00	(0.81)
PIMCO Ultra Short Government Active Exchange-Traded Fund
06/30/2024	$100.15	$5.28	$0.04	$5.32	$(4.36)	$0.00	$0.00	$(4.36)
06/21/2023 - 06/30/2023	100.00	0.18	(0.03)	0.15	0.00	0.00	0.00	0.00
PIMCO Commodity Strategy Active Exchange-Traded Fund (Consolidated)
06/30/2024	$25.23	$1.21	$1.78	$2.99	$(0.94)	$(0.03)	$0.00	$(0.97)
05/09/2023 - 06/30/2023	25.00	0.18	0.05	0.23	0.00	0.00	0.00	0.00

A zero balance may reflect actual amounts rounding to less than $0.01 or 0.01%.

Annualized, except for organizational expense, if any.

(a)

Includes adjustments required by U.S. GAAP and may differ from net asset values and performance reported elsewhere by the Funds.

(b)

Per share amounts based on average number of shares outstanding during the year or period.

(c)

The tax characterization of distributions is determined in accordance with Federal income tax regulations. See Note 2, Distributions to Shareholders, in the Notes to Financial Statements for more information.

(d)

Includes adjustments required by U.S. GAAP and may differ from net asset values and performance reported elsewhere by the Funds. Additionally, excludes initial sales charges and contingent deferred sales charges.

(e)

Portfolio turnover rate excludes securities received or delivered from in-kind processing of creation or redemptions.

(f)

Ratios shown do not include expenses of the investment companies in which a Fund may invest. See Note 9, Fees and Expenses, in the Notes to Financial Statements for more information regarding the expenses and any applicable fee waivers associated with these investments.

104 Prospectus | PIMCO ETF Trust

PIMCO ETF Trust

Appendix A

Description of Securities Ratings

The Fund’s investments may range in quality from securities rated in the lowest category in which the Fund is permitted to invest to securities rated in the highest category (as rated by Moody’s, Standard & Poor’s or Fitch, or, if unrated, determined by PIMCO to be of comparable quality). The percentage of the Fund’s assets invested in securities in a particular rating category will vary. The following terms are generally used to describe the credit quality of fixed income securities:

High Quality Debt Securities are those rated in one of the two highest rating categories (the highest category for commercial paper) or, if unrated, deemed comparable by PIMCO.

Investment Grade Debt Securities are those rated in one of the four highest rating categories, or, if unrated, deemed comparable by PIMCO.

Below Investment Grade High Yield Securities (“Junk Bonds”), are those rated lower than Baa by Moody’s, BBB by Standard & Poor’s or Fitch, and comparable securities. They are deemed predominantly speculative with respect to the issuer’s ability to repay principal and interest.

The following is a description of Moody’s, Standard & Poor’s and Fitch’s rating categories applicable to fixed income securities.

Moody’s Investors Service, Inc.

Global Long-Term Rating Scale

Ratings assigned on Moody’s global long-term rating scales are forward-looking opinions of the relative credit risks 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 eleven months 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.

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 judged to be upper-medium grade and are subject to low credit risk.

Baa: Obligations rated Baa are judged to be medium-grade and subject to moderate credit risk 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 and are typically in default, with little prospect for recovery of principal or interest.

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, insurers, finance 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 with 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.

Medium-Term Note Program Ratings

Moody’s assigns provisional ratings to medium-term note (MTN) or similar programs and definitive ratings to the individual debt securities issued from them (referred to as drawdowns or notes).

MTN program ratings are intended to reflect the ratings likely to be assigned to drawdowns issued from the program with the specified priority of claim (e.g., senior or subordinated). To capture the contingent nature of a program rating, Moody’s assigns provisional ratings to MTN programs. A provisional rating is denoted by a (P) in front of the rating.

The rating assigned to a drawdown from a rated MTN or bank/deposit note program is definitive in nature, and may differ from the program rating if the drawdown is exposed to additional credit risks besides the issuer’s default, such as links to the defaults of other issuers, or has other structural features that warrant a different rating. In some circumstances, no rating may be assigned to a drawdown.

Moody’s encourages market participants to contact Moody’s Ratings Desks or visit www.moodys.com directly if they have questions regarding ratings for specific notes issued under a medium-term note program. Unrated notes issued under an MTN program may be assigned an NR (not rated) symbol.

Global Short-Term Rating Scale

Ratings assigned on Moody’s global short-term rating scales are forward-looking opinions of the relative credit risks of financial obligations issued by non-financial corporates, financial institutions, structured finance vehicles, project finance vehicles, and public sector entities. Short-term ratings are assigned to obligations with an original maturity of thirteen months or less 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.

Moody’s employs the following designations to indicate the relative repayment ability of rated issuers:

A-1 Prospectus | PIMCO ETF Trust

Prospectus

P-1: Ratings of Prime-1 reflect a superior ability to repay short-term obligations.

P-2: Ratings of Prime-2 reflect a strong ability to repay short-term obligations.

P-3: Ratings of Prime-3 reflect an acceptable ability to repay short-term obligations.

NP: Issuers (or supporting institutions) rated Not Prime do not fall within any of the Prime rating categories.

National Scale Long-Term Ratings

Moody’s long-term National Scale Ratings (NSRs) are opinions of the relative creditworthiness of issuers and financial obligations within a particular country. NSRs are not designed to be compared among countries; rather, they address relative credit risk within a given country. Moody’s assigns national scale ratings in certain local capital markets in which investors have found the global rating scale provides inadequate differentiation among credits or is inconsistent with a rating scale already in common use in the country.

In each specific country, the last two characters of the rating indicate the country in which the issuer is located or the financial obligation was issued (e.g., Aaa.ke for Kenya).

Aaa.n: Issuers or issues rated Aaa.n demonstrate the strongest creditworthiness relative to other domestic issuers and issuances.

Aa.n: Issuers or issues rated Aa.n demonstrate very strong creditworthiness relative to other domestic issuers and issuances.

A.n: Issuers or issues rated A.n present above-average creditworthiness relative to other domestic issuers and issuances.

Baa.n: Issuers or issues rated Baa.n represent average creditworthiness relative to other domestic issuers and issuances.

Ba.n: Issuers or issues rated Ba.n demonstrate below-average creditworthiness relative to other domestic issuers and issuances.

B.n: Issuers or issues rated B.n demonstrate weak creditworthiness relative to other domestic issuers and issuances.

Caa.n: Issuers or issues rated Caa.n demonstrate very weak creditworthiness relative to other domestic issuers and issuances.

Ca.n: Issuers or issues rated Ca.n demonstrate extremely weak creditworthiness relative to other domestic issuers and issuances.

C.n: Issuers or issues rated C.n demonstrate the weakest creditworthiness relative to other domestic issuers and issuances.

National Scale Short-Term Ratings

Moody’s short-term NSRs are opinions of the ability of issuers or issuances in a given country, relative to other domestic issuers or issuances, to repay debt obligations that have an original maturity not

exceeding thirteen months. Short-term NSRs in one country should not be compared with short-term NSRs in another country, or with Moody’s global ratings. There are four categories of short-term national scale ratings, generically denoted N-1 through N-4 as defined below.

In each specific country, the first two letters indicate the country in which the issuer is located (e.g., KE-1 through KE-4 for Kenya).

N-1: N-1 issuers or issuances represent the strongest likelihood of repayment of short-term debt obligations relative to other domestic issuers or issuances.

N-2: N-2 issuers or issuances represent an above average likelihood of repayment of short-term debt obligations relative to other domestic issuers or issuances.

N-3: N-3 issuers or issuances represent an average likelihood of repayment of short-term debt obligations relative to other domestic issuers or issuances.

N-4: N-4 issuers or issuances represent a below average likelihood of repayment of short-term debt obligations relative to other domestic issuers or issuances.

The short-term rating symbols P-1.za, P-2.za, P-3.za and NP.za are used in South Africa.

Short-Term Obligation Ratings

The Municipal Investment Grade (MIG) scale is used for US municipal cash flow notes, bond anticipation notes and certain other short-term obligations, which typically mature in three years or less. Under certain circumstances, the MIG scale is used for bond anticipation notes with maturities of up to five years.

MIG 1: This designation denotes superior credit quality. Excellent protection is afforded by established cash flows, highly reliable liquidity support, or demonstrated broad-based access to the market for refinancing.

MIG 2: This designation denotes strong credit quality. Margins of protection are ample, although not as large as in the preceding group.

MIG 3: This designation denotes acceptable credit quality. Liquidity and cash-flow protection may be narrow, and market access for refinancing is likely to be less well-established.

SG: This designation denotes speculative-grade credit quality. Debt instruments in this category may lack sufficient margins of protection.

Demand Obligation Ratings

In the case of variable rate demand obligations (VRDOs), a two-component rating is assigned. The components are a long-term rating and a short-term demand obligation rating. The long-term rating addresses the issuer’s ability to meet scheduled principal and interest payments. The short-term demand obligation rating addresses the ability of the issuer or the liquidity provider to make payments associated with the purchase-price-upon-demand feature (“demand feature”) of the VRDO. The short-term demand obligation rating uses the Variable Municipal Investment Grade (VMIG) scale.

October 31, 2024 (as supplemented November 20, 2024) | Prospectus A-2

PIMCO ETF Trust

VMIG 1: This designation denotes superior credit quality. Excellent protection is afforded by the superior short-term credit strength of the liquidity provider and structural and legal protections.

VMIG 2: This designation denotes strong credit quality. Good protection is afforded by the strong short-term credit strength of the liquidity provider and structural and legal protections.

VMIG 3: This designation denotes acceptable credit quality. Adequate protection is afforded by the satisfactory short-term credit strength of the liquidity provider and structural and legal protections.

SG: This designation denotes speculative-grade credit quality. Demand features rated in this category may be supported by a liquidity provider that does not have a sufficiently strong short-term rating or may lack the structural or legal protections.

Standard & Poor’s Ratings Services

Long-Term Issue Credit Ratings

Issue credit ratings are based, in varying degrees, on S&P Global Ratings’ (“S&P”) analysis of the following considerations:

■

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

■

Nature and provisions of the financial obligation and the promise S&P imputes; and

■

Protection afforded by, and relative position of, the financial obligation in the event of a bankruptcy, reorganization, or other arrangement under the laws of bankruptcy and other laws affecting creditors’ rights.

Issue ratings are an assessment of default risk, but may incorporate an assessment of relative seniority or ultimate recovery in the event of default. Junior obligations are typically rated lower than senior obligations, to reflect lower priority in bankruptcy, as noted above. (Such differentiation may apply when an entity has both senior and subordinated obligations, secured and unsecured obligations, or operating company and holding company obligations.)

Investment Grade

AAA: An obligation rated ‘AAA’ has the highest rating assigned by S&P. The obligor’s capacity to meet its financial commitments on the obligation is extremely strong.

AA: An obligation rated ‘AA’ differs from the highest-rated obligations only to a small degree. The obligor’s capacity to meet its financial commitments on the obligation is very strong.

A: An obligation rated ‘A’ is somewhat more susceptible to the adverse effects of changes in circumstances and economic conditions than obligations in higher-rated categories. However, the obligor’s capacity to meet its financial commitments on the obligation is still strong.

BBB: An obligation rated ‘BBB’ exhibits adequate protection parameters. However, adverse economic conditions or changing circumstances are more likely to weaken the obligor’s capacity to meet its financial commitments on the obligation.

Speculative Grade

Obligations rated ‘BB’, ‘B’, ‘CCC’, ‘CC’, and ‘C’ are regarded as having significant speculative characteristics. ‘BB’ indicates the least degree of speculation and ‘C’ the highest. While such obligations will likely have some quality and protective characteristics, these may be outweighed by large uncertainties or major exposure to adverse conditions.

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

B: An obligation rated ‘B’ is more vulnerable to nonpayment than obligations rated ‘BB’, but the obligor currently has the capacity to meet its financial commitments on the obligation. Adverse business, financial, or economic conditions will likely impair the obligor’s capacity or willingness to meet its financial commitments on the obligation.

CCC: An obligation rated ‘CCC’ is currently vulnerable to nonpayment, and is dependent upon favorable business, financial, and economic conditions for the obligor to meet its financial commitments on the obligation. In the event of adverse business, financial, or economic conditions, the obligor is not likely to have the capacity to meet its financial commitments on the obligation.

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

C: An obligation rated ‘C’ is currently highly vulnerable to nonpayment, and the obligation is expected to have lower relative seniority or lower ultimate recovery compared with obligations that are rated higher.

D: An obligation rated ‘D’ is 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 believes that such payments will be made within the next five business days in the absence of a stated grace period or within the earlier of the stated grace period or the next 30 calendar days. The ‘D’ rating also will be used upon the filing of a bankruptcy petition or the taking of similar action and where default on an obligation is a virtual certainty, for example due to automatic stay provisions. A rating on an obligation is lowered to ‘D’ if it is subject to a distressed debt restructuring.

NR: This indicates that a rating has not been assigned or is no longer assigned.

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 rating categories.

A-3 Prospectus | PIMCO ETF Trust

Prospectus

Short-Term Issue Credit Ratings

A-1: A short-term obligation rated ‘A-1’ is rated in the highest category by S&P. The obligor’s capacity to meet its financial commitments 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 commitments on these obligations is extremely strong.

A-2: A short-term obligation rated ‘A-2’ is somewhat more susceptible to the adverse effects of changes in circumstances and economic conditions than obligations in higher rating categories. However, the obligor’s capacity to meet its financial commitments on the obligation is satisfactory.

A-3: A short-term obligation rated ‘A-3’ exhibits adequate protection parameters. However, adverse economic conditions or changing circumstances are more likely to weaken an obligor’s capacity to meet its financial commitments on the obligation.

B: A short-term obligation rated ‘B’ is regarded as vulnerable and has significant speculative characteristics. The obligor currently has the capacity to meet its financial commitments; however, it faces major ongoing uncertainties that could lead to the obligor’s inadequate capacity to meet its financial commitments.

C: A short-term obligation rated ‘C’ is currently vulnerable to nonpayment and is dependent upon favorable business, financial, and economic conditions for the obligor to meet its financial commitments on the obligation.

D: A short-term obligation rated ‘D’ is 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 believes that such payments will be made within any stated grace period. However, any stated grace period longer than five business days will be treated as five business days. The ‘D’ rating also will be used upon the filing of a bankruptcy petition or the taking of a similar action and where default on an obligation is a virtual certainty, for example due to automatic stay provisions. A rating on an obligation is lowered to ‘D’ if it is subject to a distressed debt restructuring.

Dual Ratings: Dual ratings may be assigned to debt issues that have a put option or demand feature. The first component of the rating addresses the likelihood of repayment of principal and interest as due, and the second component of the rating addresses only the demand feature. The first component of the rating can relate to either a short-term or long-term transaction and accordingly use either short-term or long-term rating symbols. The second component of the rating relates to the put option and is assigned a short-term rating symbol (for example, ‘AAA/A-1+‘ or ‘A-1+/ A-1’). With U.S. municipal short-term demand debt, the U.S. municipal short-term note rating symbols are used for the first component of the rating (for example, ‘SP-1+/A-1+‘).

Active Qualifiers

S&P uses the following qualifiers that limit the scope of a rating. The structure of the transaction can require the use of a qualifier such as a ‘p’ qualifier, which indicates the rating addresses the principal portion of the obligation only. A qualifier appears as a suffix and is part of the rating.

L: Ratings qualified with ‘L’ apply only to amounts invested up to federal deposit insurance limits.

p: This suffix is used for issues in which the credit factors, the terms, or both, that determine the likelihood of receipt of payment of principal are different from the credit factors, terms or both that determine the likelihood of receipt of interest on the obligation. The ‘p’ suffix indicates that the rating addresses the principal portion of the obligation only and that the interest is not rated.

prelim: Preliminary ratings, with the ‘prelim’ suffix, may be assigned to obligors or obligations, including financial programs, in the circumstances described below. Assignment of a final rating is conditional on the receipt by S&P of appropriate documentation. S&P reserves the right not to issue a final rating. Moreover, if a final rating is issued, it may differ from the preliminary rating.

■

Preliminary ratings may be assigned to obligations, most commonly structured and project finance issues, pending receipt of final documentation and legal opinions.

■

Preliminary ratings may be assigned to obligations that will likely be issued upon the obligor’s emergence from bankruptcy or similar reorganization, based on late-stage reorganization plans, documentation, and discussions with the obligor. Preliminary ratings may also be assigned to the obligors. These ratings consider the anticipated general credit quality of the reorganized or post-bankruptcy issuer as well as attributes of the anticipated obligation(s).

■

Preliminary ratings may be assigned to entities that are being formed or that are in the process of being independently established when, in S&P’s opinion, documentation is close to final. Preliminary ratings may also be assigned to the obligations of these entities.

■

Preliminary ratings may be assigned when a previously unrated entity is undergoing a well-formulated restructuring, recapitalization, significant financing or other transformative event, generally at the point that investor or lender commitments are invited. The preliminary rating may be assigned to the entity and to its proposed obligation(s). These preliminary ratings consider the anticipated general credit quality of the obligor, as well as attributes of the anticipated obligation(s), assuming successful completion of the transformative event. Should the transformative event not occur, S&P would likely withdraw these preliminary ratings.

■

A preliminary recovery rating may be assigned to an obligation that has a preliminary issue credit rating.

October 31, 2024 (as supplemented November 20, 2024) | Prospectus A-4

PIMCO ETF Trust

t: This symbol indicates termination structures that are designed to honor their contracts to full maturity or, should certain events occur, to terminate and cash settle all their contracts before their final maturity date.

cir: This symbol indicates a Counterparty Instrument Rating (CIR), which is a forward-looking opinion about the creditworthiness of an issuer in a securitization structure with respect to a specific financial obligation to a counterparty (including interest rate swaps, currency swaps, and liquidity facilities). The CIR is determined on an ultimate payment basis; these opinions do not take into account timeliness of payment.

Inactive Qualifiers (no longer applied or outstanding)

*: This symbol indicated that the rating was contingent upon S&P receipt of an executed copy of the escrow agreement or closing documentation confirming investments and cash flows. Discontinued use in August 1998.

c: This qualifier was used to provide additional information to investors that the bank may terminate its obligation to purchase tendered bonds if the long-term credit rating of the issuer was lowered to below an investment-grade level and/or the issuer’s bonds were deemed taxable. Discontinued use in January 2001.

G: The letter ‘G’ followed the rating symbol when a fund’s portfolio consisted primarily of direct U.S. government securities.

i: This suffix was used for issues in which the credit factors, terms, or both that determine the likelihood of receipt of payment of interest are different from the credit factors, terms, or both that determine the likelihood of receipt of principal on the obligation. The 'i' suffix indicated that the rating addressed the interest portion of the obligation only. The 'i' suffix was always used in conjunction with the 'p' suffix, which addresses likelihood of receipt of principal. For example, a rated obligation could have been assigned a rating of 'AAApNRi' indicating that the principal portion was rated 'AAA' and the interest portion of the obligation was not rated.

pi: This qualifier was used to indicate ratings that were based on an analysis of an issuer’s published financial information, as well as additional information in the public domain. Such ratings did not, however, reflect in-depth meetings with an issuer’s management and therefore, could have been based on less comprehensive information than ratings without a ‘pi’ suffix. Discontinued use as of December 2014 and as of August 2015 for Lloyd’s Syndicate Assessments.

pr: The letters ‘pr’ indicate that the rating was provisional. A provisional rating assumed the successful completion of a project financed by the debt being rated and indicates that payment of debt service requirements was largely or entirely dependent upon the successful, timely completion of the project. This rating, however, while addressing credit quality subsequent to completion of the project, made no comment on the likelihood of or the risk of default upon failure of such completion.

q: A ‘q’ subscript indicates that the rating is based solely on quantitative analysis of publicly available information. Discontinued use in April 2001.

r: The ‘r’ modifier was assigned to securities containing extraordinary risks, particularly market risks, that are not covered in the credit rating. The absence of an ‘r’ modifier should not be taken as an indication that an obligation would not exhibit extraordinary noncredit-related risks. S&P discontinued the use of the ‘r’ modifier for most obligations in June 2000 and for the balance of obligations (mainly structured finance transactions) in November 2002.

Fitch Ratings

Long-Term Credit Ratings
Investment Grade

Rated entities in a number of sectors, including financial and non-financial corporations, sovereigns, insurance companies and certain sectors within public finance, are generally assigned Issuer Default Ratings (“IDRs”). IDRs are also assigned to certain entities or enterprises in global infrastructure, project finance, and public finance. IDRs opine on an entity’s relative vulnerability to default (including by way of a distressed debt exchange) on financial obligations. The threshold default risk addressed by the IDR is generally that of the financial obligations whose non-payment would best reflect the uncured failure of that entity. As such, IDRs also address relative vulnerability to bankruptcy, administrative receivership or similar concepts.

In aggregate, IDRs provide an ordinal ranking of issuers based on the agency’s view of their relative vulnerability to default, rather than a prediction of a specific percentage likelihood of default.

AAA: Highest credit quality. ‘AAA’ ratings denote the lowest expectation of default risk. They are assigned only in cases of exceptionally strong capacity for payment of financial commitments. This capacity is highly unlikely to be adversely affected by foreseeable events.

AA: Very high credit quality. ‘AA’ ratings denote expectations of very low default risk. They indicate very strong capacity for payment of financial commitments. This capacity is not significantly vulnerable to foreseeable events.

A: High credit quality. ‘A’ ratings denote expectations of low default risk. The capacity for payment of financial commitments is considered strong. This capacity may, nevertheless, be more vulnerable to adverse business or economic conditions than is the case for higher ratings.

BBB: Good credit quality. ‘BBB’ ratings indicate that expectations of default risk are currently low. The capacity for payment of financial commitments is considered adequate, but adverse business or economic conditions are more likely to impair this capacity.

Speculative Grade

BB: Speculative. ‘BB’ ratings indicate an elevated vulnerability to default risk, particularly in the event of adverse changes in business or economic conditions over time; however, business or financial flexibility exists that supports the servicing of financial commitments.

A-5 Prospectus | PIMCO ETF Trust

Prospectus

B: Highly speculative. ‘B’ ratings indicate that material default risk is present, but a limited margin of safety remains. Financial commitments are currently being met; however, capacity for continued payment is vulnerable to deterioration in the business and economic environment.

CCC: Substantial credit risk. Very low margin for safety. Default is a real possibility.

CC: Very high levels of credit risk. Default of some kind appears probable.

C: Near default.

A default or default-like process has begun, or for a closed funding vehicle, payment capacity is irrevocably impaired. Conditions that are indicative of a ‘C’ category rating for an issuer include:

a. the issuer has entered into a grace or cure period following non-payment of a material financial obligation;

b. the formal announcement by the issuer or their agent of a distressed debt exchange;

c. a closed financing vehicle where payment capacity is irrevocably impaired such that it is not expected to pay interest and/or principal in full during the life of the transaction, but where no payment default is imminent.

RD: Restricted default. ‘RD’ ratings indicate an issuer that in Fitch’s opinion has experienced an uncured payment default or distressed debt exchange on a bond, loan or other material financial obligation but has not entered into bankruptcy filings, administration, receivership, liquidation or other formal winding-up procedure, and has not otherwise ceased operating. This would include:

i. the selective payment default on a specific class or currency of debt;

ii. the uncured expiry of any applicable original grace period, cure period or default forbearance period following a payment default on a bank loan, capital markets security or other material financial obligation.

D: Default. ‘D’ ratings indicate an issuer that in Fitch’s opinion has entered into bankruptcy filings, administration, receivership, liquidation or other formal winding-up procedure or that has otherwise ceased business and debt is still outstanding. Default ratings are not assigned prospectively to entities or their obligations; within this context, non-payment on an instrument that contains a deferral feature or grace period will generally not be considered a default until after the expiration of the deferral or grace period, unless a default is otherwise driven by bankruptcy or other similar circumstance, or by a distressed debt exchange.

In all cases, the assignment of a default rating reflects the agency’s opinion as to the most appropriate rating category consistent with the rest of its universe of ratings, and may differ from the definition of default under the terms of an issuer’s financial obligations or local commercial practice.

The modifiers “+” or “-” may be appended to a rating to denote relative status within major rating categories. For example, the rating category ‘AA’ has three notch-specific rating levels (’AA+‘; ’AA’; ‘AA-’; each a rating level). Such suffixes are not added to ‘AAA’ ratings and ratings below the ‘CCC’ category.

Recovery Ratings

Recovery Ratings are assigned to selected individual securities and obligations, most frequently for individual obligations of corporate finance issuers with IDRs in speculative grade categories.

Among the factors that affect recovery rates for securities are the collateral, the seniority relative to other obligations in the capital structure (where appropriate), and the expected value of the company or underlying collateral in distress.

The Recovery Rating scale is based on the expected relative recovery characteristics of an obligation upon the curing of a default, emergence from insolvency or following the liquidation or termination of the obligor or its associated collateral.

Recovery Ratings are an ordinal scale and do not attempt to precisely predict a given level of recovery. As a guideline in developing the rating assessments, the agency employs broad theoretical recovery bands in its ratings approach based on historical averages and analytical judgment, but actual recoveries for a given security may deviate materially from historical averages.

RR1: Outstanding recovery prospects given default. ‘RR1’ rated securities have characteristics consistent with securities historically recovering 91%-100% of current principal and related interest.

RR2: Superior recovery prospects given default. ‘RR2’ rated securities have characteristics consistent with securities historically recovering 71%-90% of current principal and related interest.

RR3: Good recovery prospects given default. ‘RR3’ rated securities have characteristics consistent with securities historically recovering 51%-70% of current principal and related interest.

RR4: Average recovery prospects given default. ‘RR4’ rated securities have characteristics consistent with securities historically recovering 31%-50% of current principal and related interest.

RR5: Below average recovery prospects given default. ‘RR5’ rated securities have characteristics consistent with securities historically recovering 11%-30% of current principal and related interest.

RR6: Poor recovery prospects given default. ‘RR6’ rated securities have characteristics consistent with securities historically recovering 0%-10% of current principal and related interest.

Short-Term Credit Ratings

A short-term issuer or obligation rating is based in all cases on the short-term vulnerability to default of the rated entity and relates to the capacity to meet financial obligations in accordance with the documentation governing the relevant obligation. Short-term deposit ratings may be adjusted for loss severity. Short-Term Ratings are assigned to obligations whose initial maturity is viewed as “short term” based on market convention (a long-term rating can also be used to rate

October 31, 2024 (as supplemented November 20, 2024) | Prospectus A-6

PIMCO ETF Trust
650 Newport Center Drive
Newport Beach, CA 92660

The Trust’s SAI, Form N-CSR and annual and semi-annual reports to shareholders include additional information about the Funds. The SAI is incorporated by reference into this prospectus, which means it is part of this prospectus for legal purposes. The Funds' annual report discusses the market conditions and investment strategies that significantly affected each Fund’s performance during its last fiscal year. In Form N-CSR, you will find the Funds' annual and semi-annual financial statements.

You may get free copies of any of these materials or request other information about a Fund by calling the Trust at 1.888.400.4ETF (1.888.400.4383), by visiting www.pimcoetfs.com or by writing to:

PIMCO ETF Trust
650 Newport Center Drive
Newport Beach, CA 92660

You may access reports and other information about the Trust on the EDGAR Database on the Commission’s web site at www.sec.gov. You may get copies of additional information about the Trust, including its SAI, with payment of a duplication fee, by e-mailing your request to publicinfo@sec.gov.

You can also visit our web site at www.pimcoetfs.com for additional information about the Funds, including the SAI, the annual and semi-annual reports to shareholders, and other information such as Fund financial statements, which are available for download free of charge.

Reference the Trust’s Investment Company Act file number in your correspondence.

Investment Company Act File Number: 811-22250

ETF0002_112024

	TICKER	EXCHANGE
SHORT DURATION
PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund	EMNT	NYSE Arca
PIMCO Enhanced Short Maturity Active Exchange-Traded Fund	MINT	NYSE Arca
PIMCO Prime Limited Maturity Active Exchange-Traded Fund	PPRM
PIMCO Ultra Short Government Active Exchange-Traded Fund	BILZ	NYSE Arca
CORE
PIMCO Active Bond Exchange-Traded Fund	BOND	NYSE
PIMCO Enhanced Low Duration Active Exchange-Traded Fund	LDUR	NYSE Arca
TAX-EXEMPT MUNICIPAL
PIMCO Short Term Municipal Bond Active Exchange-Traded Fund	SMMU	NYSE Arca
PIMCO Intermediate Municipal Bond Active Exchange-Traded Fund	MUNI	NYSE Arca
PIMCO Municipal Income Opportunities Active Exchange-Traded Fund	MINO	NYSE Arca
SENIOR LOANS
PIMCO Senior Loan Active Exchange-Traded Fund	LONZ	NYSE Arca
CREDIT
PIMCO Multisector Bond Active Exchange-Traded Fund	PYLD	NYSE Arca
COMMODITIES
PIMCO Commodity Strategy Active Exchange-Traded Fund	CMDT	NYSE Arca
CREDIT BONDS
PIMCO Preferred and Capital Securities Active Exchange-Traded Fund	PRFD	NYSE Arca

	Page
Fund Summaries	1
PIMCO Active Bond Exchange-Traded Fund	1
PIMCO Commodity Strategy Active Exchange-Traded Fund	5
PIMCO Enhanced Low Duration Active Exchange-Traded Fund	10
PIMCO Enhanced Short Maturity Active ESG Exchange-Traded Fund	14
PIMCO Enhanced Short Maturity Active Exchange-Traded Fund	18
PIMCO Intermediate Municipal Bond Active Exchange-Traded Fund	21
PIMCO Multisector Bond Active Exchange-Traded Fund	24
PIMCO Municipal Income Opportunities Active Exchange-Traded Fund	28
PIMCO Preferred and Capital Securities Active Exchange-Traded Fund	32
PIMCO Prime Limited Maturity Active Exchange-Traded Fund	36
PIMCO Senior Loan Active Exchange-Traded Fund	38
PIMCO Short Term Municipal Bond Active Exchange-Traded Fund	42
PIMCO Ultra Short Government Active Exchange-Traded Fund	45
Summary of Other Important Information Regarding Fund Shares	47
Summary Information About the Funds	47
Description of Principal Risks	49
Disclosure of Portfolio Holdings	68
Management of the Funds	69
Buying and Selling Shares	75
How Net Asset Value Is Determined	78
Fund Distributions	79
Tax Consequences	79
Characteristics and Risks of Securities and Investment Techniques	81
Financial Highlights	102
Appendix A - Description of Securities Ratings	A-1