# EDGAR Filing Document

**Accession Number:** 0000778207
**File Stem:** 0001193125-26-121498
**Filing Date:** 2026-3
**Character Count:** 7985
**Document Hash:** 3ed9ba99eb37da697503efae9eb7ca05
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-121498.hdr.sgml**: 20260324

**ACCESSION NUMBER**: 0001193125-26-121498

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260324

**DATE AS OF CHANGE**: 20260324

**EFFECTIVENESS DATE**: 20260324

**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:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-00507
- **FILM NUMBER:** 26785588

**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 High Yield Bond VP (Series ID: S000007909)

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

**TRANSAMERICA SERIES TRUST** 

**Supplement to the Currently Effective Prospectus, Summary Prospectus** 

**and Statement of Additional Information** 

**Transamerica Aegon High Yield Bond VP** 

\* \* \*

*Effective April 1, 2026, Andrew Maslan will be added as a portfolio manager of the portfolio. Effective on or about April 28, 2026, Benjamin D. Miller, CFA, will no longer serve as a portfolio manager of the portfolio.* 

\* \* \*

*Effective April 1, 2026, the following will replace the corresponding information for the portfolio in the "Management" section of the Prospectus and Summary Prospectus:* 

---

| | | |
|:---|:---|:---|
|  **Management:** |  |  |
|  *Investment Manager:* Transamerica Asset Management, Inc.  | *Investment Manager:* Transamerica Asset Management, Inc.  | *Investment Manager:* Transamerica Asset Management, Inc.  |
|  *Sub-Adviser:* Aegon USA Investment Management, LLC | *Sub-Adviser:* Aegon USA Investment Management, LLC | *Sub-Adviser:* Aegon USA Investment Management, LLC |
|  *Portfolio Managers:* |  |  |
| Kevin Bakker, CFA | Portfolio Manager | since November 2009 |
| Benjamin D. Miller, CFA<sup>1</sup> | Portfolio Manager | since November 2009 |
| Andrew Maslan | Portfolio Manager | since April 2026 |
| James K. Schaeffer, Jr. | Portfolio Manager | since March 2011 |

---

<sup>1</sup> Effective April 28, 2026, Mr. Miller will no longer serve as a Portfolio Manager of the portfolio.

*Effective April 1, 2026, the following will replace the corresponding information for the portfolio in the "Shareholder Information – Portfolio Manager(s)" section of the Prospectus:* 

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; **Name** | **Sub-Adviser** | **Positions Over Past Five Years** |
| &nbsp;&nbsp;&nbsp;Kevin Bakker, CFA | Aegon USA Investment Management, LLC | Portfolio Manager of the portfolio since 2009; Employee with Aegon USA Investment Management, LLC since 2003, initially as a research analyst and became a portfolio manager in 2007; Head of U.S. High Yield |
| &nbsp;&nbsp;&nbsp;Benjamin D. Miller, CFA\* | Aegon USA Investment Management, LLC | Portfolio Manager of the portfolio since 2009; Employee with Aegon USA Investment Management, LLC since 1993, initially as a research analyst and became a portfolio manager in 2006 |
| &nbsp;&nbsp;&nbsp;Andrew Maslan | Aegon USA Investment Management, LLC | Portfolio Manager of the fund since 2026; Employee with Aegon USA Investment Management, LLC since 2024; Currently a portfolio manager and research team leader on the Distressed Credit team; Director, M&G Investments from 2020 to 2024; previously employed at Aegon USA Investment Management, LLC from 2015 to 2020 |
| &nbsp;&nbsp;&nbsp;James K. Schaeffer, Jr. | Aegon USA Investment Management, LLC | Portfolio Manager of the portfolio since 2011; Employee with Aegon USA Investment Management, LLC since 2004 and held various investment management roles; Currently Head of US Leveraged Finance and Global CLOs |

---

\* Effective April 28, 2026, Mr. Miller will no longer serve as a Portfolio Manager of the portfolio.

\* \* \*

------

*Effective April 1, 2026, the following will replace the corresponding information for the portfolio in the "Portfolio Managers - Aegon USA Investment Management, LLC ("AUIM")" section of Appendix B of the Statement of Additional Information:* 

**Transamerica Aegon High Yield Bond VP** 

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| &nbsp;&nbsp;&nbsp;**Portfolio Manager** | **Registered Investment <br>Companies** | **Registered Investment <br>Companies** | **Other Pooled Investment<br>Vehicles** | **Other Pooled Investment<br>Vehicles** | **Other Accounts** | **Other Accounts** |
| &nbsp;&nbsp;&nbsp;**Portfolio Manager** | **Number** | **Assets <br>Managed** | **Number** | **Assets <br>Managed** | **Number** | **Assets <br>Managed** |
| &nbsp;&nbsp;&nbsp;Kevin Bakker, CFA\* | 1 | $844 million | 2 | $345 million | 6 | $935 million |
| &nbsp;&nbsp;&nbsp;Benjamin D. Miller, CFA\*<sup>√</sup> | 1 | $844 million | 2 | $345 million | 6 | $935 million |
| &nbsp;&nbsp;&nbsp;Andrew Maslan\* | 0 | $0 | 0 | $0 | 1 | $99 million |
| &nbsp;&nbsp;&nbsp;James K. Schaeffer, Jr.\* | 1 | $844 million | 2 | $345 million | 9 | $1.1 billion |
| &nbsp;&nbsp;&nbsp;**Fee Based Accounts<br>(The number of accounts and the total assets in the accounts managed by each portfolio manager with<br>respect to which the advisory fee is based on the performance of the account.)** | &nbsp;&nbsp;&nbsp;**Fee Based Accounts<br>(The number of accounts and the total assets in the accounts managed by each portfolio manager with<br>respect to which the advisory fee is based on the performance of the account.)** | &nbsp;&nbsp;&nbsp;**Fee Based Accounts<br>(The number of accounts and the total assets in the accounts managed by each portfolio manager with<br>respect to which the advisory fee is based on the performance of the account.)** | &nbsp;&nbsp;&nbsp;**Fee Based Accounts<br>(The number of accounts and the total assets in the accounts managed by each portfolio manager with<br>respect to which the advisory fee is based on the performance of the account.)** | &nbsp;&nbsp;&nbsp;**Fee Based Accounts<br>(The number of accounts and the total assets in the accounts managed by each portfolio manager with<br>respect to which the advisory fee is based on the performance of the account.)** | &nbsp;&nbsp;&nbsp;**Fee Based Accounts<br>(The number of accounts and the total assets in the accounts managed by each portfolio manager with<br>respect to which the advisory fee is based on the performance of the account.)** | &nbsp;&nbsp;&nbsp;**Fee Based Accounts<br>(The number of accounts and the total assets in the accounts managed by each portfolio manager with<br>respect to which the advisory fee is based on the performance of the account.)** |
| &nbsp;&nbsp;&nbsp;Kevin Bakker, CFA\* | 0 | $0 | 0 | $0 | 2 | $527 million |
| &nbsp;&nbsp;&nbsp;Benjamin D. Miller, CFA\*<sup>√</sup> | 0 | $0 | 0 | $0 | 2 | $527 million |
| &nbsp;&nbsp;&nbsp;Andrew Maslan\* | 0 | $0 | 0 | $0 | 0 | $0 |
| &nbsp;&nbsp;&nbsp;James K. Schaeffer, Jr.\* | 0 | $0 | 0 | $0 | 1 | $490 million |

---

\* As of December 31, 2025

<sup>√</sup> Effective April 28, 2026, Mr. Miller will no longer serve as a Portfolio Manager of the portfolio.

**\* \* \*** 

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

**March 24, 2026**