# EDGAR Filing Document

**Accession Number:** 0000892538
**File Stem:** 0001193125-25-336460
**Filing Date:** 2025-12
**Character Count:** 4057
**Document Hash:** 3361185601cbee7d1b17570ac371f6eb
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-336460.hdr.sgml**: 20251230

**ACCESSION NUMBER**: 0001193125-25-336460

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251230

**DATE AS OF CHANGE**: 20251230

**EFFECTIVENESS DATE**: 20251230

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SUNAMERICA SERIES TRUST
- **CENTRAL INDEX KEY:** 0000892538

**ORGANIZATION NAME:**
- **EIN:** 137002445
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0131

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-52742
- **FILM NUMBER:** 251612927

**BUSINESS ADDRESS:**
- **STREET 1:** 21650 OXNARD STREET, 10TH FLOOR
- **CITY:** WOODLAND HILLS
- **STATE:** CA
- **ZIP:** 91367
- **BUSINESS PHONE:** 551-235-3560

**MAIL ADDRESS:**
- **STREET 1:** 30 HUDSON STREET
- **STREET 2:** 16TH FLOOR
- **CITY:** JERSEY CITY
- **STATE:** NJ
- **ZIP:** 07302

## Series and Classes Contracts Data

### SA MFS Large Cap Growth Portfolio (Series ID: S000008085)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021981 | Class 1      |  |
| C000021982 | Class 2      |  |
| C000021983 | Class 3      |  |

**Filed under Rule 497(e) and Rule 497(k)<br> Registration No. 033-52742** 

**SUNAMERICA SERIES TRUST** 

SA MFS Large Cap Growth Portfolio

(the "Portfolio")

Supplement dated December 30, 2025, to the Portfolio's

Summary Prospectus and Prospectus, each dated May 1, 2025, as supplemented to date

Effective January 1, 2026, the following changes are made to the Fund's Summary Prospectuses and Prospectus, as applicable:

*The section of the Summary Prospectus entitled "Investment Adviser****—****Portfolio Managers" is deleted in its entirety and replaced with the following:* 

---

| | |
|:---|:---|
| **Name and Title** | **Portfolio Manager<br>of the Fund Since** |
|  Matthew W. Krummell\*<br> Investment Officer, Lead Portfolio Manager | 2013 |
|  James C. Fallon<br> Investment Officer | 2015 |
|  John E. Stocks<br> Investment Officer | 2015 |
|  Jonathan W. Sage<br> Investment Officer | 2015 |
|  Nathan G. Bryant, CFA<br> Investment Officer | January 2026 |
|  Jenney Zhang, CFA<br> Investment Officer | January 2026 |

---

*\* Mr. Krummell has announced his retirement from MFS effective April 2027. Until his retirement, Mr. Krummell will continue to serve on the portfolio management team, and upon his retirement, Messrs. Fallon, Stocks, Sage, and Bryant and Ms. Zhang will continue to be responsible for the management of the Portfolio*.

*The third paragraph of the Prospectus, related to the SA MFS Large Cap Growth Portfolio, in the section entitled "Management—Information about the Subadvisers—Massachusetts Financial Services Company (MFS<sup>®</sup>)" are deleted in its entirety and replaced with the following:* 

The SA MFS Large Cap Growth Portfolio (formerly, SA MFS Blue Chip Growth Portfolio) is managed by Matthew W. Krummell, James C. Fallon, Jonathan W. Sage, John E. Stocks, Nathan G. Bryant, CFA, and Jenney Zhang, CFA. Mr. Krummell, Investment Officer and Lead Portfolio Manager, has been employed in the investment area of MFS since 2001. Effective April 7, 2027, Mr. Krummell will retire from MFS and relinquish his portfolio management responsibilities on the SA MFS Large Cap Growth Portfolio. Mr. Fallon, Investment Officer, has been employed in the investment area of MFS since 1999. Mr. Sage, Investment Officer, has been employed in the investment area of MFS since 2000. Mr. Stocks, Investment Officer, has been employed in the investment area of MFS since 2001. Nathan G. Bryant, CFA, Investment Officer, has been employed in the investment area of MFS since 2015. Jenney Zhang, CFA, Investment Officer, has been employed in the investment area of MFS since 2011.

------

*Capitalized terms used in this Supplement shall, unless otherwise defined herein, have the same meaning as given in the Prospectus and/or SAI.*

**PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE.** 

SCSP-86703T-BCG1 (12/25)