# EDGAR Filing Document

**Accession Number:** 0000892538
**File Stem:** 0001193125-25-336466
**Filing Date:** 2025-12
**Character Count:** 5904
**Document Hash:** bf85ea33230c2693e9d967d60ead893c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-336466.hdr.sgml**: 20251230

**ACCESSION NUMBER**: 0001193125-25-336466

**CONFORMED SUBMISSION TYPE**: 497

**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:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-52742
- **FILM NUMBER:** 251612950

**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 Name | Class ID   |
| Class 1    | C000021981 |
| Class 2    | C000021982 |
| Class 3    | C000021983 |

---

## 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 Statement of Additional Information

("SAI") of the Portfolio, dated May 1, 2025, as supplemented to date

Effective January 1, 2026, the following changes are made to the Portfolio's SAI:

*The section entitled "Portfolio Managers—Other Accounts" is revised as follows:* 

*The sub-section entitled "MFS" is deleted in its entirety and replaced with the following:* 

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| &nbsp;&nbsp;&nbsp;**Advisers/ <br>Subadviser** | **Portfolio Manager** | **Other Accounts<br>(As of January 31, 2025)<br>Unless otherwise noted** | **Other Accounts<br>(As of January 31, 2025)<br>Unless otherwise noted** | **Other Accounts<br>(As of January 31, 2025)<br>Unless otherwise noted** | **Other Accounts<br>(As of January 31, 2025)<br>Unless otherwise noted** | **Other Accounts<br>(As of January 31, 2025)<br>Unless otherwise noted** | **Other Accounts<br>(As of January 31, 2025)<br>Unless otherwise noted** |
| &nbsp;&nbsp;&nbsp;**Advisers/ <br>Subadviser** | **Portfolio Manager** | **Registered**<br> **Investment**<br> **Companies** | **Registered**<br> **Investment**<br> **Companies** | **Pooled**<br> **Investment**<br> **Vehicles** | **Pooled**<br> **Investment**<br> **Vehicles** | **Other Accounts** | **Other Accounts** |
| &nbsp;&nbsp;&nbsp;**Advisers/ <br>Subadviser** | **Portfolio Manager** | **No. of <br>Accounts** | **Assets <br>($ millions)** | **No. of <br>Accounts** | **Assets <br>($ millions)** | **No. of <br>Accounts** | **Assets <br>($ millions)** |
| &nbsp;&nbsp;&nbsp; MFS | Fallon, James C.<br> Gorham, Steven R.<br> Krummell, Matthew W.\*<br> Mackey, Alexander M.<br> O'Neill Mackey, Alison<br> Marston, Joshua P.<br> Munko, Johnathan<br> Sage, Jonathan W.<br> Stocks, John E.<br> Jason, Jude<br> Bryant, Nathan<br> Zhang, Jenney | 14<br> 7<br> 14<br> 17<br> 3<br> 10<br> 6<br> 17<br> 15<br> 3<br> 0<br> 0 | $7,281.6<br> $19,034.9<br> $7,281.6<br> $38,560.5<br> $8,524.8<br> $27,237.4<br> $12,618.2<br> $10,876.9<br> $7,385.9<br> $8,524.8<br> $0<br> $0 | 13<br> 6<br> 13<br> 5<br> 2<br> 9<br> 5<br> 15<br> 13<br> 2<br> 0<br> 0 | $2,422.9<br> $2,373.9<br> $2,422.9<br> $3,311.1<br> $989.8<br> $3,891<br> $2,350.6<br> $3,819.6<br> $2,422.9<br> $989.8<br> $0<br> $0 | 27<br> 17<br> 25<br> 5<br> 6<br> 19<br> 17<br> 30<br> 28<br> 6<br> 0<br> 0 | $8,028<br> $14,190.7<br> $7,627.5<br> $459.1<br> $1,368.1<br> $2,106.6<br> $14,190.7<br> $10,908.2<br> $7,631<br> $1,368.1<br> $0<br> $0 |

---

*\* 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 section entitled "Portfolio Managers—Other Accounts" is revised as follows:* 

*In the sub-section entitled "MFS—Compensation" in the sixth paragraph the first row in the table referring to SA MFS Large Cap Growth Portfolio is deleted in its entirety and replaced with the following:* 

---

| | |
|:---|:---|
| **Portfolio** | **Portfolio Manager** |
|  SA MFS Large Cap Growth Portfolio | Matthew W. Krummell\* Russell<sup>®</sup> 1000 Growth Index |
|  SA MFS Large Cap Growth Portfolio | <br> James C. Fallon<br> Russell<sup>®</sup> 1000 Growth Index |
|  SA MFS Large Cap Growth Portfolio | <br> Jonathan W. Sage<br> Russell<sup>®</sup> 1000 Growth Index |
|  SA MFS Large Cap Growth Portfolio | <br> John E. Stocks<br> Russell<sup>®</sup> 1000 Growth Index |
|  | Nathan G. Bryant, CFA Russell<sup>®</sup> 1000 Growth Index |
|  | Jenney Zhang, CFA Russell<sup>®</sup> 1000 Growth Index |

---

------

*\* 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.* 

*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.** 

SASTSAI-SUP3 (12/25)