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Summary Prospectus

May 1, 2025

SunAmerica Series Trust

SA American Funds® Global Growth Portfolio

(Class 1 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. 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 growth.

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 Expenses1 (expenses that you pay each year as a percentage of the value of your investment)

	Class 1	Class 3
Management Fees	1.42%	1.42%
Service (12b-1) Fees	None	0.25%
Other Expenses	0.08%	0.08%
Total Annual Portfolio Operating Expenses	1.50%	1.75%
Fee Waivers and/or Expense Reimbursements2,3	0.80%	0.80%
Total Annual Portfolio Operating Expenses After Fee Waivers and/or Expense Reimbursements2,3	0.70%	0.95%

Amounts reflect the total expenses of the Portfolio and the Master Global Growth Fund (as defined herein). The Total Annual Portfolio Operating Expenses do not correlate to the ratio of expenses appearing in the Financial Highlights table in the most recent shareholder report. The Financial Highlights table reflects only the operating expenses of the Portfolio and does not include the fees of the Master Global Growth Fund.

SunAmerica Asset Management, LLC (“SunAmerica”) has entered into a contractual agreement with SunAmerica Series Trust (the “Trust”) under which it will waive 0.70% of its advisory fee for such time as the Portfolio is operated as a feeder fund, because during that time it will not be providing the portfolio management portion of the advisory and management services to be provided under its investment advisory and management agreement with the Trust. This fee waiver will continue indefinitely as long as the Portfolio is part of a master-feeder fund structure and cannot be reduced or eliminated without approval of the Board of Trustees of the Trust.

Capital Research and Management Company (“Capital Research”) currently waives a portion of its management fee equal to 0.10% of the Master Global Growth Fund’s net assets. This waiver will be in effect through at least May 1, 2026, unless modified or terminated by the Master Global Growth Fund’s Board. The waiver may only be modified or terminated with the approval of the Master Global Growth Fund’s Board.

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. The Example reflects the aggregate expenses of both the Master Global Growth Fund (as defined below) and the Portfolio and assumes that the contractual waiver of SunAmerica’s advisory fee continues for all periods shown and that the contractual waiver of Capital Research’s management fee remains in effect through at least May 1, 2026. Although your actual costs may be

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higher or lower, based on these assumptions and the Total Annual Portfolio Operating Expenses After Fee Waivers and/or Expense Reimbursements shown in the fee table, your costs would be:

	1 Year	3 Years	5 Years	10 Years
Class 1	$72	$245	$434	$980
Class 3	97	324	570	1,274

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 5% of the average value of its portfolio.

Principal Investment Strategies of the Portfolio

The Portfolio described in this Prospectus operates as a “feeder fund” and attempts to achieve its investment goal by investing all or substantially all of its assets in Class 1 shares of the American Funds Insurance Series® Global Growth Fund (the “Master Global Growth Fund”), a portfolio offered by American Funds Insurance Series®, a registered open-end investment company. The Master Global Growth Fund invests primarily in common stocks of companies around the world that the Master Global Growth Fund’s investment adviser believes have the potential for growth. As a fund that seeks to invest globally, the Master Global Growth Fund will allocate its assets among securities of companies in various countries, including the United States and countries with emerging markets (but in no fewer than three countries). Under normal market conditions, the Master Global Growth Fund will invest a percentage of its net assets outside the United States. That percentage will represent at least (a) 40% of the Master Global Growth Fund’s net assets, unless market conditions are not deemed favorable by the Master Global Growth Fund’s investment adviser, in which case 30%, or (b) the percentage of the MSCI All Country World Index represented by companies outside the United States minus 5%, whichever is lower.

Capital Research, the investment adviser of the Master Global Growth Fund, may consider environmental, social and governance (“ESG”) factors that, depending on the facts and circumstances, are material to the value of an issuer or instrument. ESG factors may include, but are not limited to, environmental issues (e.g., water use, emission

levels, waste, environmental remediation), social issues (e.g., human capital, health and safety, changing customer behavior) or governance issues (e.g., board composition, executive compensation, shareholder dilution).

Investment of the Portfolio’s assets in the Master Global Growth Fund is not a fundamental policy of the Portfolio and a shareholder vote is not required for the Portfolio to withdraw its entire investment in the Master Global Growth Fund.

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.

Equity Securities Risk. The Portfolio invests primarily (through its investment in the Master Global Growth Fund) in equity securities. As with any equity fund, the value of your investment in the Portfolio may fluctuate in response to stock market movements. You should be aware that the performance of various types of equity stocks may rise or decline under varying market conditions — for example, “value” stocks may perform well in circumstances under which “growth” stocks in general have fallen, or vice versa. In addition, individual stocks selected for the Master Global Growth Fund may underperform the market generally, relevant indices or other funds with comparable investment objectives or strategies.

Risks of Investing in Growth Stocks. Growth stocks are historically volatile, which will affect the Master Global Growth Fund and the Portfolio. Growth stocks can be volatile for several reasons. Since the issuers of growth stocks usually reinvest a high portion of earnings in their own business, 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. However, the market frequently rewards growth stocks with price increases when expectations are met or exceeded.

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Foreign Exposure Risk. The Master Global Growth Fund may invest in foreign securities. Investors in foreign countries are subject to a number of risks. A principal risk is that fluctuations in the exchange rates between the U.S. dollar and foreign currencies may negatively affect an investment. In addition, there may be less publicly available information about a foreign company and it may not be subject to the same uniform accounting, auditing and financial reporting standards as U.S. companies. Foreign governments may not regulate securities markets and companies to the same degree as in the U.S. Foreign investments will also be affected by local political, social or economic developments and governmental actions. Consequently, foreign securities may be less liquid, more volatile and more difficult to price than U.S. securities. These risks may be heightened to the extent the Master Global Growth Fund invests in emerging markets.

Emerging Markets Risk. Investing in countries with developing economies and/or markets may involve risks in addition to and greater than those generally associated with investing in the securities markets of developed countries. Emerging and developing countries may have less developed legal and accounting systems than those in developed countries. The governments of these countries may be more unstable and more likely to impose capital controls, nationalize a company or industry, place restrictions on foreign ownership and on withdrawing sale proceeds of securities from the country, and/or impose punitive taxes that could adversely affect the prices of securities. In addition, the value of investments outside the United States may be reduced by foreign taxes, including foreign withholding taxes on interest and dividends. The economies of these countries may be dependent on relatively few industries, may have limited access to capital and may be more susceptible to local and global changes. Securities markets in these countries can also be relatively small and have substantially lower trading volumes. As a result, securities issued in these countries may be more volatile and less liquid, and may be more difficult to value, than securities issued in countries with more developed economies or markets. Because these markets may not be as mature, there may be increased settlement risks for transactions in local securities.

ESG Investment Risk. The Master Global Growth Fund’s adherence to its ESG criteria and application of related analyses when selecting investments may impact the Master Global Growth Fund’s performance, including relative to similar funds that do not adhere to such criteria or apply such analyses. Additionally, the Master Global Growth Fund’s adherence to its ESG criteria and application of related analyses in connection with identifying and selecting investments may require

subjective analysis and may be more difficult if data about a particular company or market is limited, such as with respect to issuers in emerging markets countries. The Master Global Growth Fund may invest in companies that do not reflect the beliefs and values of any particular investor. Socially responsible norms differ by country and region, and a company’s ESG practices or the subadviser’s assessment of such may change over time.

Market Risk. The Portfolio’s or the Master Global Growth Fund’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. The prospects for an industry or issuer may deteriorate because of a variety of factors, including disappointing earnings or changes in the competitive environment. In addition, the Master Global Growth Fund’s investment adviser’s assessment of issuers held in the Master Global Growth Fund may prove incorrect, resulting in losses or poor performance even in a rising market. Finally, the Master Global Growth Fund’s investment approach could fall out of favor with the investing public, resulting in lagging performance versus other comparable portfolios.

Master-Feeder Structure Risk. Other “feeder” funds may also invest in the Master Global Growth Fund. As shareholders of the Master Global Growth Fund, feeder funds, including the Portfolio, vote on matters pertaining to the Master Global Growth Fund. Feeder funds with a greater pro rata ownership in the Master Global Growth Fund could have effective voting control of the operations of the Master Global Growth Fund. Also, a large-scale redemption by another feeder fund may increase the proportionate share of the costs of the Master Global Growth Fund borne by the remaining feeder fund shareholders, including the Portfolio.

You should also refer to the Master Global Growth Fund’s prospectus and the statements of additional information for your Portfolio and the Master Global Growth Fund, which are available free of charge upon request.

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

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table compares the Portfolio’s average annual returns to those of the MSCI ACWI Index (net) (a broad-based securities market index), which is relevant to the Portfolio because it has characteristics similar to the Portfolio’s investment strategies. Fees and expenses incurred at the Variable 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.

(Class 3 Shares)

During the period shown in the bar chart:

Highest Quarterly Return:	June 30, 2020	24.24%
Lowest Quarterly Return:	June 30, 2022	-16.68%

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

	1 Year	5 Years	10 Years	Since Inception	Inception Date
Class 1 Shares	13.68%	9.74%	N/A	11.53%	9/26/2016
Class 3 Shares	13.25%	9.45%	10.43%
MSCI ACWI Index (net)	17.49%	10.06%	9.23%	10.70%

Investment Adviser

SunAmerica serves as investment adviser to the Portfolio pursuant to its investment advisory and management agreement with the Trust. Capital Research serves as investment adviser to the Master Global Growth Fund.

Portfolio Managers

Name and Title	Portfolio Manager of Master Global Growth Fund Since
Patrice Collette Partner - Capital World Investors	2015
Matt Hochstetler Partner - Capital World Investors	2023
Roz Hongsaranagon Partner - Capital World Investors	2019
Piyada Phanaphat Partner - Capital World Investors	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. 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.

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