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Summary Prospectus

May 1, 2025

SunAmerica Series Trust

SA JPMorgan Mid-Cap Growth 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 growth of capital.

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	0.76%	0.76%	0.76%
Service (12b-1) Fees	None	0.15%	0.25%
Other Expenses	0.03%	0.03%	0.03%
Total Annual Portfolio Operating Expenses	0.79%	0.94%	1.04%
Fee Waivers and/or Expense Reimbursements1	0.04%	0.04%	0.04%
Total Annual Portfolio Operating Expenses After Fee Waivers and/ or Expense Reimbursements1	0.75%	0.90%	1.00%

Pursuant to an Advisory Fee Waiver Agreement, effective through April 30, 2026, SunAmerica Asset Management, LLC (“SunAmerica”)

is contractually obligated to waive a portion of its advisory fee with respect to the Portfolio so that the net advisory fee rate payable by the Portfolio to SunAmerica under the Investment Advisory and Management Agreement with the Trust is equal to 0.79% of the Portfolio’s average daily net assets on the first $100 million, 0.75% of the Portfolio’s average daily net assets on the next $400 million, and 0.73% of the Portfolio’s average daily net assets over $500 million. SunAmerica may not recoup any advisory fees waived with respect to the Portfolio pursuant to the Advisory Fee Waiver Agreement. This agreement may be modified or discontinued prior to April 30, 2026 only with the approval of 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 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	$77	$248	$435	$974
Class 2	92	296	516	1,151
Class 3	102	327	570	1,267

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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 59% 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 equity securities (common stocks, preferred stocks and convertible securities) of medium-sized companies that the subadviser believes have above-average growth potential. Medium-sized companies will generally include companies whose market capitalizations, at the time of purchase, range from the market capitalization of the smallest company included in the Russell Midcap® Index to the market capitalization of the largest company in the Russell Midcap® Index during the most recent 12-month period.

The Portfolio may invest up to 20% of its net assets in foreign securities, including securities of issuers located in emerging markets. The Portfolio may invest in fixed income securities, principally corporate securities.

In managing the Portfolio, the subadviser employs a process that combines research, valuation and stock selection to identify companies that have a history of above-average growth or which the subadviser believes will achieve above-average growth in the future. Growth companies purchased for the Portfolio include those with leading competitive positions, predictable and durable business models and management that can achieve sustained growth. The subadviser makes specific purchase decisions based on a number of quantitative factors, including valuation and improving fundamentals, as well as the stock and industry insights of the subadviser’s research and portfolio management teams. Finally, a disciplined, systematic portfolio construction process is employed to minimize uncompensated risks relative to the benchmark.

The subadviser sells a security for several reasons. The subadviser may sell a security due to a change in the company’s fundamentals, a change in the original reason for purchase of an investment, or new investment

opportunities with higher expected returns emerge to displace existing portfolio holdings with lower expected returns. Finally, the subadviser may also sell a security which the subadviser no longer considers reasonably valued.

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 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.

Convertible Securities Risk. The values of the convertible securities in which the Portfolio may invest will be affected by market interest rates, the risk that the issuer may default on interest or principal payments and the value of the underlying common stock into which these securities may be converted. Specifically, certain types of convertible securities may pay fixed interest and dividends; their values may fall if market interest rates rise and rise if market interest rates fall. Additionally, an issuer may have the right to buy back or “call” certain of the convertible securities at a time unfavorable to the Portfolio.

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.

Preferred Stock Risk. Preferred stockholders’ liquidation rights are subordinate to the company’s debt holders and creditors. If interest rates rise, the fixed dividend on preferred stocks may be less attractive and the price of preferred stocks may decline. Deferred dividend

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payments by an issuer of preferred stock could have adverse tax consequences for the Portfolio and may cause the preferred stock to lose substantial value.

Mid-Cap Companies Risk. Securities of mid-cap companies are usually more volatile and entail greater risks than securities of large companies.

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.

Growth Stock Risk. The Portfolio invests substantially in growth style stocks. 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.

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

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.

Bonds Risk. The value of your investment in the Portfolio may go up or down in response to changes in interest

rates or defaults (or even the potential for future defaults) by bond issuers.

Interest Rate Risk. Fixed income securities may be subject to volatility due to changes in interest rates. The value of fixed-income securities may decline when interest rates go up or increase when interest rates go down. The interest earned on fixed-income securities may decline when interest rates go down or increase when interest rates go up. Duration is a measure of interest rate risk that indicates how price-sensitive a bond is to changes in interest rates. Longer-term and lower coupon bonds tend to be more sensitive to changes in interest rates. For example, a bond with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%. Changing interest rates may have unpredictable effects on markets, may result in heightened market volatility, and could negatively impact the Portfolio’s performance. Any future changes in monetary policy made by central banks and/or their governments are likely to affect the level of interest rates.

Credit Risk. Credit risk applies to most debt securities, but is generally not a factor for obligations backed by the “full faith and credit” of the U.S. Government. The Portfolio could lose money if the issuer of a debt security is unable or perceived to be unable to pay interest or to repay principal when it becomes due.

An issuer with a lower credit rating will be more likely than a higher rated issuer to default or otherwise become unable to honor its financial obligations. Issuers with low credit ratings typically issue junk bonds. In addition to the risk of default, junk bonds may be more volatile, less liquid, more difficult to value and more susceptible to adverse economic conditions or investor perceptions than other bonds.

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.

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

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assessment of securities held in the Portfolio may prove incorrect, resulting in losses or poor performance even in a rising market.

Affiliated Fund Rebalancing Risk. The Portfolio may be an investment option for other mutual funds for which SunAmerica Asset Management, LLC (“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 Russell 3000® Index (a broad-based securities market index) and the Russell Midcap® Growth Index, 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.

(Class 1 Shares)

During the period shown in the bar chart:

Highest Quarterly Return:	June 30, 2020	32.53%
Lowest Quarterly Return:	June 30, 2022	-20.73%
Year to Date Most Recent Quarter:	March 31, 2025	-9.28%

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

	1 Year	5 Years	10 Years
Class 1 Shares	14.26%	11.09%	11.63%
Class 2 Shares	14.02%	10.92%	11.46%
Class 3 Shares	13.93%	10.81%	11.35%
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)	23.81%	13.86%	12.55%
Russell Midcap® Growth Index (reflects no deduction for fees, expenses or taxes)	22.10%	11.47%	11.54%

Investment Adviser

The Portfolio’s investment adviser is SunAmerica.

The Portfolio is subadvised by J.P. Morgan Investment Management Inc.

Portfolio Managers

Name and Title	Portfolio Manager of the Portfolio Since
Felise Agranoff, CFA Managing Director and Co-Portfolio Manager	2016
Daniel Bloomgarden, CFA Managing Director and Co-Portfolio Manager	July 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

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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 companies may make payments to the sponsoring insurance company (or its affiliates) for distribution and/or other services. These payments may create a conflict of interest as they may be a factor that the insurance company considers in including a Portfolio as an underlying investment option in the Variable Contract. The prospectus (or other offering document) for your Variable Contract may contain additional information about these payments.

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