# EDGAR Filing Document

**Accession Number:** 0000778207
**File Stem:** 0001193125-25-337418
**Filing Date:** 2025-12
**Character Count:** 28701
**Document Hash:** 05eaeb22ccf7f7f6ada376cde4b64f7c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-337418.hdr.sgml**: 20251231

**ACCESSION NUMBER**: 0001193125-25-337418

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251231

**DATE AS OF CHANGE**: 20251230

**EFFECTIVENESS DATE**: 20251231

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** TRANSAMERICA SERIES TRUST
- **CENTRAL INDEX KEY:** 0000778207

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-00507
- **FILM NUMBER:** 251615508

**BUSINESS ADDRESS:**
- **STREET 1:** 1801 CALIFORNIA STREET
- **STREET 2:** SUITE 5200
- **CITY:** DENVER
- **STATE:** CO
- **ZIP:** 80202
- **BUSINESS PHONE:** 720-482-8836

**MAIL ADDRESS:**
- **STREET 1:** 1801 CALIFORNIA STREET
- **STREET 2:** SUITE 5200
- **CITY:** DENVER
- **STATE:** CO
- **ZIP:** 80202

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AEGON/TRANSAMERICA SERIES TRUST
- **DATE OF NAME CHANGE:** 20050511

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AEGON/TRANSAMERICA SERIES FUND INC
- **DATE OF NAME CHANGE:** 20010501

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** WRL SERIES FUND INC
- **DATE OF NAME CHANGE:** 19920703

## Series and Classes Contracts Data

### Transamerica Aegon Core Bond VP (Series ID: S000007896)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021437 |
| Service    | C000021438 |

---

### Transamerica BlackRock Real Estate Securities VP (Series ID: S000007898)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021441 |
| Service    | C000021442 |

---

### Transamerica JPMorgan Tactical Allocation VP (Series ID: S000007899)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021443 |
| Service    | C000021444 |

---

### Transamerica JPMorgan Enhanced Index VP (Series ID: S000007902)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021449 |
| Service    | C000021450 |

---

### Transamerica TSW Mid Cap Value Opportunities VP (Series ID: S000007903)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021451 |
| Service    | C000021452 |

---

### Transamerica Aegon Sustainable Equity Income VP (Series ID: S000007908)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021461 |
| Service    | C000021462 |

---

### Transamerica AEGON High Yield Bond VP (Series ID: S000007909)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021463 |
| Service    | C000021464 |

---

### Transamerica Aegon Bond VP (Series ID: S000007911)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021467 |
| Service    | C000021468 |

---

### Transamerica Morgan Stanley Capital Growth VP (Series ID: S000007912)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021469 |

---

### Transamerica T. Rowe Price Small Cap VP (Series ID: S000007915)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021475 |
| Service    | C000021476 |

---

### Transamerica International Focus VP (Series ID: S000007918)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021481 |
| Service    | C000021482 |

---

### Transamerica Multi-Managed Balanced VP (Series ID: S000007919)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021483 |
| Service    | C000021484 |

---

### Transamerica BlackRock iShares Edge 40 VP (Series ID: S000007920)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021485 |
| Service    | C000021486 |

---

### Transamerica WMC US Growth VP (Series ID: S000007921)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021487 |
| Service    | C000021488 |

---

### Transamerica BlackRock Government Money Market VP (Series ID: S000007924)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021493 |
| Service    | C000021494 |

---

### Transamerica Small/Mid Cap Value VP (Series ID: S000007925)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021495 |
| Service    | C000021496 |

---

### Transamerica AEGON U.S. Government Securities VP (Series ID: S000007926)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021497 |
| Service    | C000021498 |

---

### Transamerica TSW International Equity VP (Series ID: S000007928)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021501 |
| Service    | C000021502 |

---

### Transamerica JPMorgan Asset Allocation - Conservative VP (Series ID: S000007929)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021503 |
| Service    | C000021504 |

---

### Transamerica Janus Mid-Cap Growth VP (Series ID: S000007930)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021505 |
| Service    | C000021506 |

---

### Transamerica JPMorgan Asset Allocation - Growth VP (Series ID: S000007932)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021509 |
| Service    | C000021510 |

---

### Transamerica JPMorgan Asset Allocation - Moderate VP (Series ID: S000007933)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021511 |
| Service    | C000021512 |

---

### Transamerica JPMorgan Asset Allocation - Moderate Growth VP (Series ID: S000007934)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000021513 |
| Service    | C000021514 |

---

### Transamerica JPMorgan International Moderate Growth VP (Series ID: S000012821)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000034664 |
| Service    | C000034665 |

---

### Transamerica Goldman Sachs Managed Risk-Balanced ETF VP (Series ID: S000021746)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000062365 |
| Service    | C000062366 |

---

### Transamerica Goldman Sachs Managed Risk-Growth ETF VP (Series ID: S000021747)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000062367 |
| Service    | C000062368 |

---

### Transamerica Janus Balanced VP (Series ID: S000025012)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Service    | C000074409 |
| Initial    | C000074410 |

---

### Transamerica BlackRock iShares Tactical - Balanced VP (Series ID: S000025013)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Service    | C000074411 |
| Initial    | C000074412 |

---

### Transamerica BlackRock iShares Tactical - Growth VP (Series ID: S000025014)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Service    | C000074413 |
| Initial    | C000074414 |

---

### Transamerica BlackRock iShares Tactical - Conservative VP (Series ID: S000025015)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Service    | C000074415 |
| Initial    | C000074416 |

---

### Transamerica ProFund UltraBear VP (Series ID: S000025331)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000075537 |
| Service    | C000075538 |

---

### Transamerica BlackRock Tactical Allocation VP (Series ID: S000025458)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000076203 |
| Service    | C000076204 |

---

### Transamerica Morgan Stanley Global Allocation VP (Series ID: S000025459)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000076205 |
| Service    | C000076206 |

---

### Transamerica Goldman Sachs Managed Risk-Conservative ETF VP (Series ID: S000026902)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000080975 |
| Service    | C000080976 |

---

### Transamerica BlackRock iShares Active Asset Allocation - Conservative VP (Series ID: S000031950)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000099459 |
| Service    | C000099460 |

---

### Transamerica BlackRock iShares Active Asset Allocation - Moderate Growth VP (Series ID: S000031951)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000099461 |
| Service    | C000099462 |

---

### Transamerica BlackRock iShares Active Asset Allocation - Moderate VP (Series ID: S000031952)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000099463 |
| Service    | C000099464 |

---

### Transamerica Madison Diversified Income VP (Series ID: S000031955)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000099469 |
| Service    | C000099470 |

---

### Transamerica PineBridge Inflation Opportunities VP (Series ID: S000031958)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000099475 |
| Service    | C000099476 |

---

### Transamerica BlackRock iShares Dynamic Allocation - Balanced VP (Series ID: S000036843)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000112675 |
| Service    | C000112676 |

---

### Transamerica BlackRock iShares Dynamic Allocation - Moderate Growth VP (Series ID: S000036844)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000112677 |
| Service    | C000112678 |

---

### Transamerica Market Participation Strategy VP (Series ID: S000036845)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000112679 |
| Service    | C000112680 |

---

### Transamerica Morgan Stanley Global Allocation Managed Risk - Balanced VP (Series ID: S000047203)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000147920 |
| Service    | C000147921 |

---

### Transamerica American Funds Managed Risk VP (Series ID: S000049122)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Service    | C000154895 |

---

### Transamerica BlackRock iShares Edge 50 VP (Series ID: S000053165)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Service    | C000167272 |

---

### Transamerica BlackRock iShares Edge 75 VP (Series ID: S000053166)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Service    | C000167273 |

---

### Transamerica BlackRock iShares Edge 100 VP (Series ID: S000053167)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Service    | C000167274 |

---

### Transamerica MSCI EAFE Index VP (Series ID: S000057298)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Service    | C000182874 |
| Initial    | C000197833 |

---

### Transamerica S&P 500 Index VP (Series ID: S000057299)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Service    | C000182875 |
| Initial    | C000197834 |

---

### Transamerica Great Lakes Advisors Large Cap Value VP (Series ID: S000059116)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Initial    | C000193818 |
| Service    | C000193819 |

---

### Transamerica 60/40 Allocation VP (Series ID: S000060985)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Service    | C000197832 |

---

### Transamerica Goldman Sachs 70/30 Allocation VP (Series ID: S000067836)

---

|  |  |
|:---|:---|
| Class Name | Class ID   |
| Service    | C000217588 |

---

## Series and Classes Contracts Data

### Transamerica Aegon Core Bond VP (Series ID: S000007896)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021437 | Initial      |  |
| C000021438 | Service      |  |

### Transamerica BlackRock Real Estate Securities VP (Series ID: S000007898)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021441 | Initial      |  |
| C000021442 | Service      |  |

### Transamerica JPMorgan Tactical Allocation VP (Series ID: S000007899)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021443 | Initial      |  |
| C000021444 | Service      |  |

### Transamerica JPMorgan Enhanced Index VP (Series ID: S000007902)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021449 | Initial      |  |
| C000021450 | Service      |  |

### Transamerica TSW Mid Cap Value Opportunities VP (Series ID: S000007903)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021451 | Initial      |  |
| C000021452 | Service      |  |

### Transamerica Aegon Sustainable Equity Income VP (Series ID: S000007908)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021461 | Initial      |  |
| C000021462 | Service      |  |

### Transamerica AEGON High Yield Bond VP (Series ID: S000007909)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021463 | Initial      |  |
| C000021464 | Service      |  |

### Transamerica Aegon Bond VP (Series ID: S000007911)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021467 | Initial      |  |
| C000021468 | Service      |  |

### Transamerica Morgan Stanley Capital Growth VP (Series ID: S000007912)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021469 | Initial      |  |

### Transamerica T. Rowe Price Small Cap VP (Series ID: S000007915)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021475 | Initial      |  |
| C000021476 | Service      |  |

### Transamerica International Focus VP (Series ID: S000007918)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021481 | Initial      |  |
| C000021482 | Service      |  |

### Transamerica Multi-Managed Balanced VP (Series ID: S000007919)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021483 | Initial      |  |
| C000021484 | Service      |  |

### Transamerica BlackRock iShares Edge 40 VP (Series ID: S000007920)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021485 | Initial      |  |
| C000021486 | Service      |  |

### Transamerica WMC US Growth VP (Series ID: S000007921)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021487 | Initial      |  |
| C000021488 | Service      |  |

### Transamerica BlackRock Government Money Market VP (Series ID: S000007924)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021493 | Initial      |  |
| C000021494 | Service      |  |

### Transamerica Small/Mid Cap Value VP (Series ID: S000007925)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021495 | Initial      |  |
| C000021496 | Service      |  |

### Transamerica AEGON U.S. Government Securities VP (Series ID: S000007926)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021497 | Initial      |  |
| C000021498 | Service      |  |

### Transamerica TSW International Equity VP (Series ID: S000007928)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021501 | Initial      |  |
| C000021502 | Service      |  |

### Transamerica JPMorgan Asset Allocation - Conservative VP (Series ID: S000007929)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021503 | Initial      |  |
| C000021504 | Service      |  |

### Transamerica Janus Mid-Cap Growth VP (Series ID: S000007930)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021505 | Initial      |  |
| C000021506 | Service      |  |

### Transamerica JPMorgan Asset Allocation - Growth VP (Series ID: S000007932)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021509 | Initial      |  |
| C000021510 | Service      |  |

### Transamerica JPMorgan Asset Allocation - Moderate VP (Series ID: S000007933)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021511 | Initial      |  |
| C000021512 | Service      |  |

### Transamerica JPMorgan Asset Allocation - Moderate Growth VP (Series ID: S000007934)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000021513 | Initial      |  |
| C000021514 | Service      |  |

### Transamerica JPMorgan International Moderate Growth VP (Series ID: S000012821)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000034664 | Initial      |  |
| C000034665 | Service      |  |

### Transamerica Goldman Sachs Managed Risk-Balanced ETF VP (Series ID: S000021746)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000062365 | Initial      |  |
| C000062366 | Service      |  |

### Transamerica Goldman Sachs Managed Risk-Growth ETF VP (Series ID: S000021747)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000062367 | Initial      |  |
| C000062368 | Service      |  |

### Transamerica Janus Balanced VP (Series ID: S000025012)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000074409 | Service      |  |
| C000074410 | Initial      |  |

### Transamerica BlackRock iShares Tactical - Balanced VP (Series ID: S000025013)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000074411 | Service      |  |
| C000074412 | Initial      |  |

### Transamerica BlackRock iShares Tactical - Growth VP (Series ID: S000025014)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000074413 | Service      |  |
| C000074414 | Initial      |  |

### Transamerica BlackRock iShares Tactical - Conservative VP (Series ID: S000025015)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000074415 | Service      |  |
| C000074416 | Initial      |  |

### Transamerica ProFund UltraBear VP (Series ID: S000025331)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000075537 | Initial      |  |
| C000075538 | Service      |  |

### Transamerica BlackRock Tactical Allocation VP (Series ID: S000025458)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000076203 | Initial      |  |
| C000076204 | Service      |  |

### Transamerica Morgan Stanley Global Allocation VP (Series ID: S000025459)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000076205 | Initial      |  |
| C000076206 | Service      |  |

### Transamerica Goldman Sachs Managed Risk-Conservative ETF VP (Series ID: S000026902)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000080975 | Initial      |  |
| C000080976 | Service      |  |

### Transamerica BlackRock iShares Active Asset Allocation - Conservative VP (Series ID: S000031950)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000099459 | Initial      |  |
| C000099460 | Service      |  |

### Transamerica BlackRock iShares Active Asset Allocation - Moderate Growth VP (Series ID: S000031951)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000099461 | Initial      |  |
| C000099462 | Service      |  |

### Transamerica BlackRock iShares Active Asset Allocation - Moderate VP (Series ID: S000031952)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000099463 | Initial      |  |
| C000099464 | Service      |  |

### Transamerica Madison Diversified Income VP (Series ID: S000031955)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000099469 | Initial      |  |
| C000099470 | Service      |  |

### Transamerica PineBridge Inflation Opportunities VP (Series ID: S000031958)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000099475 | Initial      |  |
| C000099476 | Service      |  |

### Transamerica BlackRock iShares Dynamic Allocation - Balanced VP (Series ID: S000036843)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000112675 | Initial      |  |
| C000112676 | Service      |  |

### Transamerica BlackRock iShares Dynamic Allocation - Moderate Growth VP (Series ID: S000036844)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000112677 | Initial      |  |
| C000112678 | Service      |  |

### Transamerica Market Participation Strategy VP (Series ID: S000036845)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000112679 | Initial      |  |
| C000112680 | Service      |  |

### Transamerica Morgan Stanley Global Allocation Managed Risk - Balanced VP (Series ID: S000047203)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000147920 | Initial      |  |
| C000147921 | Service      |  |

### Transamerica American Funds Managed Risk VP (Series ID: S000049122)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000154895 | Service      |  |

### Transamerica BlackRock iShares Edge 50 VP (Series ID: S000053165)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000167272 | Service      |  |

### Transamerica BlackRock iShares Edge 75 VP (Series ID: S000053166)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000167273 | Service      |  |

### Transamerica BlackRock iShares Edge 100 VP (Series ID: S000053167)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000167274 | Service      |  |

### Transamerica MSCI EAFE Index VP (Series ID: S000057298)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000182874 | Service      |  |
| C000197833 | Initial      |  |

### Transamerica S&P 500 Index VP (Series ID: S000057299)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000182875 | Service      |  |
| C000197834 | Initial      |  |

### Transamerica Great Lakes Advisors Large Cap Value VP (Series ID: S000059116)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000193818 | Initial      |  |
| C000193819 | Service      |  |

### Transamerica 60/40 Allocation VP (Series ID: S000060985)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000197832 | Service      |  |

### Transamerica Goldman Sachs 70/30 Allocation VP (Series ID: S000067836)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000217588 | Service      |  |

**TRANSAMERICA SERIES TRUST** 

**Supplement to the Currently Effective Statement of Additional Information** 

**\* \* \*** 

*Effective December 31, 2025, Patricia L. Sawyer will retire as a member of the Board of Trustees of Transamerica Series Trust (the "Trust").* 

*Effective January 1, 2026, Kevin A. Simonoff will be appointed as an Independent Member of the Board of Trustees of the Trust and Kathleen T. Ives will be appointed as Chairperson of the Nominating Committee of the Board of Trustees of the Trust.* 

\*\*\*

*Effective January 1, 2026, the following information appearing in the Statement of Additional Information will be updated.* 

*The following information is added to the "Independent Board Members" table contained in the "Board Members and Officers" sub-section of the Statement of Additional Information under the heading "Management of the Trust" and the information in the table regarding Ms. Sawyer is removed:* 

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; **Name and**<br> **Year of Birth**<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | **Position(s) Held<br>with Trust**<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | <br> **Term of<br>Office and<br>Length<br>of Time<br>Served\***<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | **Principal Occupation(s) During Past**<br> **Five Years**<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | **Number of Funds in<br>Complex<br>Overseen by Board** <br> **Member**<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | <br> **Other<br>Directorships<br>Held By Board<br>Member During<br>Part Five Years**<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |
| &nbsp;&nbsp;&nbsp;Kevin A. Simonoff <br>(1973) | Board Member | Since 2026 | Board Member, TF and TST (January 2026 - present);<br> President & CEO, Voya Funds (2023-2024); <br>Chief Strategy & Transformation Officer (2022-2024), Head of Business Management (2019-2022), Head of Fixed Income Business Management (2015-2019), Head of Product Management (2007-2015), Voya Investment Management;<br> Board Member, Voya Investment Management (UK) and Voya Investment Management Services (UK) Ltd (2018-2023).<br>| 94 | McIntire Alumni Advisory Board Member (2024 – present), UVA McIntire School of Commerce |

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**\* \* \*** 

*The following replaces in its entirety the second paragraph after the "Officers" table contained in the "Board Members and Officers" sub-section of the Statement of Additional Information under the heading "Management of the Trust":* 

The Board believes that each Board Member's experience, qualifications, attributes or skills on an individual basis and in combination with those of the other Board Members lead to the conclusion that the Board possesses the requisite skills and attributes. The Board believes that the Board Members' ability to review critically, evaluate, question and discuss information provided to them, to interact effectively with TAM, the sub-advisers, other services providers, counsel and independent auditors, and to exercise effective business judgment in the performance of their duties, support this conclusion. The following sets forth information about each Board Member's specific experience, qualifications, attributes and/or skills that serve as the basis for the person's continued service in that capacity: Ms. Bane has experience as a certified public accountant and as a board member of multiple organizations; Mr. Callahan has financial services industry experience as an executive and consultant with various TAM affiliates and other entities; Mr. Hill has financial and entrepreneurial experience as an executive, owner and consultant as well as experience as a board member of multiple organizations; Ms. Ives has audit, securities industry, compliance and legal experience, including as a fund executive; Ms. Kloppenburg has investment management experience as an executive and experience as a board member of multiple organizations; Mr. Nelson has investment management experience as well as other business, securities industry and fund executive experience; Mr. Pelletier has securities industry and fund legal and operations experience, entrepreneurial experience as an executive, owner and consultant, and board experience; Mr. Simonoff has securities industry and investment management experience, including as a fund executive; Mr. Smit has investment management and insurance experience as an executive and in leadership roles with TAM and affiliated entities; and Mr. Waechter has experience as a certified public accountant and a board member of multiple organizations as well as securities industry, compliance and legal experience. References to the qualifications, attributes and skills of Board Members does not constitute an assertion by the Board or any individual Board Member that a Board Member has any special expertise or experience that would impose any greater responsibility or liability on such Board Member than would exist otherwise.

**\* \* \*** 

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*The following replaces in its entirety the first paragraph under the "Board Committees" sub-section of the Statement of Additional Information under the heading "Management of the Trust":* 

The Board has two standing committees: the Audit Committee and Nominating Committee. Both the Audit Committee and Nominating Committee are chaired by an Independent Board Member and composed of all of the Independent Board Members. Mr. Waechter serves as the Audit Committee Chairperson and Ms. Ives serves as the Nominating Committee Chairperson. Through the portfolios' board committees, the Independent Board Members consider and address important matters involving the portfolios, including those presenting conflicts or potential conflicts of interest for management, and they believe they can act independently and effectively.

*\* \* \** 

*The following is added as a footnote to the table in the "Trustee Ownership of Equity Securities" sub-section and the "Compensation Table" contained in the "Trustee Compensation" sub-section in the Statement of Additional Information under the heading "Management of the Trust."* 

Information is not shown for Mr. Simonoff as he became a Board Member on January 1, 2026.

Effective as of December 31, 2025, Ms. Sawyer retired as a Board Member.

**\* \* \*** 

*Thomas R. Wald and Sean Ryan are hereby removed from the "Officers" table contained in the "Board Members and Officers" sub-section of the Statement of Additional Information under the heading "Management of the Trust."* 

**\* \* \*** 

**Investors Should Retain this Supplement for Future Reference** 

**December 31, 2025**