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Summary Prospectus

May 1, 2025

SunAmerica Series Trust

SA JPMorgan Emerging Markets Portfolio

(Class 1, Class 2 and Class 3 Shares)

SunAmerica Series Trust’s Statutory Prospectus and Statement of Additional Information, each dated May 1, 2025, as amended and supplemented from time to time, and the most recent shareholder reports are incorporated into and made part of this Summary Prospectus by reference. The Portfolio is offered only to the separate accounts of certain affiliated and unaffiliated life insurance companies and to other mutual funds. This Summary Prospectus is not intended for use by other investors.

Before you invest, you may want to review SunAmerica Series Trust’s Statutory Prospectus, which contains more information about the Portfolio and its risks. You can find the Statutory Prospectus and the above-incorporated information online at https://www.corebridgefinancial.com/getprospectus. You can also get this information at no cost by calling (800) 445-7862 or by sending an e-mail request to fundprospectus@corebridgefinancial.com.

The Securities and Exchange Commission has not approved or disapproved these securities, nor has it determined that this Summary Prospectus is accurate or complete. It is a criminal offense to state otherwise.

Investment Goal

The Portfolio’s investment goal is long-term capital appreciation.

Fees and Expenses of the Portfolio

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Portfolio. The table and the example below do not reflect the separate account fees charged in the variable annuity or variable life insurance policy (“Variable Contracts”) in which the Portfolio is offered. If separate account fees were shown, the Portfolio’s annual operating expenses would be higher. Please see your Variable Contract prospectus for more details on the separate account fees.

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

	Class 1	Class 2	Class 3
Management Fees	1.12%	1.12%	1.12%
Service (12b-1) Fees	None	0.15%	0.25%
Other Expenses	0.21%	0.21%	0.21%
Total Annual Portfolio Operating Expenses Before Fee Waivers and/ or Expense Reimbursements	1.33%	1.48%	1.58%
Fee Waivers and/or Expense Reimbursements1	0.12%	0.12%	0.12%

	Class 1	Class 2	Class 3
Total Annual Portfolio Operating Expenses After Fee Waivers and/ or Expense Reimbursements1	1.21%	1.36%	1.46%

Pursuant to an Amended and Restated Advisory Fee Waiver Agreement, effective through April 30, 2026, SunAmerica Asset Management, LLC (“SunAmerica”) is contractually obligated to waive its advisory fee with respect to the Portfolio so that the advisory fee payable by the Portfolio to SunAmerica equals 1.00% of average daily net assets. This agreement will continue in effect through April 30, 2026 and year to year thereafter, unless terminated by the Board of Trustees of SunAmerica Series Trust (the “Trust”), including a majority of the trustees who are not “interested persons” of the Trust as defined in the Investment Company Act of 1940, as amended.

Expense Example

This Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated and then redeem or hold 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 Portfolio’s operating expenses remain the same (except that the Example incorporates any applicable fee waiver and/or expense limitation arrangements for only the first year). The Example does not reflect charges imposed by the Variable Contract. If the Variable Contract fees were reflected, the expenses would be higher. See the Variable Contract prospectus for information on such charges. Although your actual costs may be higher or lower, based

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on these assumptions and the net expenses shown in the fee table, your costs would be:

	1 Year	3 Years	5 Years	10 Years
Class 1	$123	$410	$717	$1,591
Class 2	138	456	797	1,758
Class 3	149	487	849	1,868

Portfolio Turnover

The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual portfolio operating expenses or in the Example, affect the Portfolio’s performance.

During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 64% of the average value of its portfolio.

Principal Investment Strategies of the Portfolio

The Portfolio attempts to achieve its goal by investing, under normal circumstances, at least 80% of its net assets in common stocks, depositary receipts and other equity securities of companies primarily in emerging markets outside the U.S., which the subadviser believes, when compared to developed markets, have above average-growth prospects.

Emerging markets include most countries in the world except Australia, Canada, Japan, New Zealand, the United Kingdom, the United States, and most of the countries of Western Europe. An emerging market company is one: that is organized under the laws of, or has a principal place of business in an emerging market; where the principal securities market is in an emerging market; that derives at least 50% of its total revenues or profits from goods that are produced or sold, investments made, or services performed in an emerging market; or at least 50% of the assets of which are located in an emerging market. The Portfolio is not required to allocate its investments in any set percentages to any particular country. The Portfolio is not constrained by capitalization or style limits and will invest across sectors. The Portfolio will invest in securities across all market capitalizations, although the Portfolio may invest a significant portion of its assets in companies of one particular market capitalization category.

The Portfolio may overweight or underweight countries relative to its benchmark, the Morgan Stanley Capital International (“MSCI”) Emerging Markets Index (net). In managing the Portfolio, the subadviser adheres to a disciplined process for stock selection and portfolio

construction. A proprietary multi-factor model is used to quantitatively rank securities in the Portfolio’s investment universe which the subadviser uses to select securities. The Portfolio emphasizes securities that are ranked as undervalued, while underweighting or avoiding securities that appear overvalued.

The Portfolio may invest in securities denominated in U.S. dollars, major reserve currencies and currencies of other countries in which it is permitted to invest. The Portfolio typically maintains full currency exposure to those markets in which it invests. However, the Portfolio may hedge a portion of its foreign currency exposure into the U.S. dollar.

Principal Risks of Investing in the Portfolio

As with any mutual fund, there can be no assurance that the Portfolio’s investment goal will be met or that the net return on an investment in the Portfolio will exceed what could have been obtained through other investment or savings vehicles. Shares of the Portfolio are not bank deposits and are not guaranteed or insured by any bank, government entity or the Federal Deposit Insurance Corporation. If the value of the assets of the Portfolio goes down, you could lose money.

The following is a summary of the principal risks of investing in the Portfolio.

Emerging Markets Risk. Risks associated with investments in emerging markets may include: delays in settling portfolio securities transactions; currency and capital controls; greater sensitivity to interest rate changes; pervasive corruption and crime; exchange rate volatility; inflation, deflation or currency devaluation; violent military or political conflicts; confiscations and other government restrictions by the United States or other governments; and government instability. As a result, investments in emerging market securities tend to be more volatile than investments in developed countries.

Foreign Investment Risk. The Portfolio’s investments in the securities of foreign issuers or issuers with significant exposure to foreign markets involve additional risk. Foreign countries in which the Portfolio invests may have markets that are less liquid, less regulated and more volatile than U.S. markets. The value of the Portfolio’s investments may decline because of factors affecting the particular issuer as well as foreign markets and issuers generally, such as unfavorable government actions, and political or financial instability and other conditions or events (including, for example, military confrontations, war, terrorism, sanctions, disease/virus, outbreaks and epidemics). Lack of relevant data and reliable public

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information may also affect the value of these securities. The risks of foreign investments are heightened when investing in issuers in emerging market countries.

Equity Securities Risk. The Portfolio invests principally in equity securities and is therefore subject to the risk that stock prices will fall and may underperform other asset classes. Individual stock prices fluctuate from day-to-day and may decline significantly.

Growth Stock Risk. Growth stocks may lack the dividend yield associated with value stocks that can cushion total return in a bear market. Also, growth stocks normally carry a higher price/earnings ratio than many other stocks. Consequently, if earnings expectations are not met, the market price of growth stocks will often decline more than other stocks.

Small- and Mid-Cap Companies Risk. Companies with smaller market capitalizations (particularly under $1 billion depending on the market) tend to be at early stages of development with limited product lines, operating histories, market access for products, financial resources, access to new capital, or depth in management. It may be difficult to obtain reliable information and financial data about these companies. Consequently, the securities of smaller companies may not be as readily marketable and may be subject to more abrupt or erratic market movements than companies with larger capitalizations. Securities of medium-sized companies are also subject to these risks to a lesser extent.

Foreign Currency Risk. The value of the Portfolio’s foreign investments may fluctuate due to changes in currency exchange rates. A decline in the value of foreign currencies relative to the U.S. dollar generally can be expected to depress the value of the Portfolio’s non-U.S. dollar-denominated securities.

Depositary Receipts Risk.Depositary receipts, such as American Depositary Receipts, are generally subject to the same risks as the foreign securities that they evidence or into which they may be converted. The issuers of unsponsored depositary receipts are not obligated to disclose information that is considered material in the United States. Therefore, there may be less information available regarding the issuers and there may not be a correlation between such information and the market value of the depositary receipts. Certain depositary receipts are not listed on an exchange and therefore are subject to illiquidity risk.

Value Investing Risk. The subadviser’s judgment that a particular security is undervalued in relation to the company’s fundamental economic value may prove incorrect.

Issuer Risk. The value of a security may decline for a number of reasons directly related to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods and services.

Management Risk. The Portfolio is subject to management risk because it is an actively-managed investment portfolio. The Portfolio’s portfolio managers apply investment techniques and risk analyses in making investment decisions, but there can be no guarantee that these decisions or the individual securities selected by the portfolio managers will produce the desired results.

Market Risk. The Portfolio’s share price or the market as a whole can decline for many reasons or be adversely affected by a number of factors, including, without limitation: weakness in the broad market, a particular industry, or specific holdings; adverse political, regulatory or economic developments in the United States or abroad; changes in investor psychology; heavy institutional selling; military confrontations, war, terrorism and other armed conflicts, disease/virus outbreaks and epidemics; recessions; taxation and international tax treaties; currency, interest rate and price fluctuations; and other conditions or events. In addition, the subadviser’s assessment of securities held in the Portfolio may prove incorrect, resulting in losses or poor performance even in a rising market.

Active Trading Risk. The Portfolio may engage in frequent trading of securities to achieve its investment goal. Active trading may result in high portfolio turnover and correspondingly greater brokerage commissions and other transaction costs, which will be borne directly by the Portfolio and could affect its performance. During periods of increased market volatility, active trading may be more pronounced.

Affiliated Fund Rebalancing Risk. The Portfolio may be an investment option for other mutual funds for which SunAmerica serves as investment adviser that are managed as “funds of funds.” From time to time, the Portfolio may experience relatively large redemptions or investments due to the rebalancing of a fund of funds. In the event of such redemptions or investments, the Portfolio could be required to sell securities or to invest cash at a time when it is not advantageous to do so.

Performance Information

The following bar chart illustrates the risks of investing in the Portfolio by showing changes in the Portfolio’s performance from calendar year to calendar year and the table compares the Portfolio’s average annual returns to those of the MSCI ACWI ex-U.S. Index (net) (a broad-

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based securities market index) and the MSCI Emerging Markets Index (net), which is relevant to the Portfolio because it has characteristics similar to the Portfolio’s investment strategies. Fees and expenses incurred at the contract level are not reflected in the bar chart or table. If these amounts were reflected, returns would be less than those shown. Of course, past performance is not necessarily an indication of how the Portfolio will perform in the future.

Effective January 14, 2013, J.P. Morgan Investment Management, Inc. (“JPMorgan”) assumed subadvisory duties of the Portfolio. Prior to January 14, 2013, Putnam Investment Management, LLC served as subadviser.

(Class 1 Shares)

During the period shown in the bar chart:

Highest Quarterly Return:	December 31, 2020	18.76%
Lowest Quarterly Return:	March 31, 2020	-24.01%
Year to Date Most Recent Quarter:	March 31, 2025	4.80%

Average Annual Total Returns (For the periods ended December 31, 2024)

	1 Year	5 Years	10 Years
Class 1 Shares	10.63%	1.39%	3.52%
Class 2 Shares	10.50%	1.25%	3.36%
Class 3 Shares	10.23%	1.12%	3.24%
MSCI ACWI ex-U.S. Index (net)	5.53%	4.10%	4.80%
MSCI Emerging Markets Index (net)	7.50%	1.70%	3.64%

Investment Adviser

The Portfolio’s investment adviser is SunAmerica.

The Portfolio is subadvised by JPMorgan.

Portfolio Managers

Name and Title	Portfolio Manager of the Portfolio Since
Joyce Weng, CFA Executive Director and Lead Portfolio Manager	2017
Anuj Arora Managing Director and Back-Up Portfolio Manager	2013
Harold Yu Executive Director and Back-up Portfolio Manager	2022

Purchases and Sales of Portfolio Shares

Shares of the Portfolios may only be purchased or redeemed through Variable Contracts offered by the separate accounts of participating life insurance companies and by other portfolios of the Trust and Seasons Series Trust. Shares of a Portfolio may be purchased and redeemed each day the New York Stock Exchange is open, at the Portfolio’s net asset value determined after receipt of a request in good order.

The Portfolios do not have any initial or subsequent investment minimums. However, your insurance company may impose investment or account minimums. Please consult the prospectus (or other offering document) for your Variable Contract which may contain additional information about purchases and redemptions of Portfolio shares.

Tax Information

The Portfolios will not be subject to U.S. federal income tax so long as they qualify as regulated investment companies and distribute their income and gains each year to their shareholders. However, contractholders may be subject to U.S. federal income tax (and a U.S. federal Medicare tax of 3.8% that applies to net investment income, including taxable annuity payments, if applicable) upon withdrawal from a Variable Contract. Contractholders should consult the prospectus (or other offering document) for the Variable Contract for additional information regarding taxation.

Payments to Broker-Dealers and
Other Financial Intermediaries

The Portfolios are not sold directly to the general public but instead are offered as an underlying investment option for Variable Contracts and to other portfolios of the Trust and Seasons Series Trust. A Portfolio and its related

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