# EDGAR Filing Document

**Accession Number:** 0000778207
**File Stem:** 0001410368-25-027177
**Filing Date:** 2025-11
**Character Count:** 31366
**Document Hash:** 194650981e783d17b522d30d46ca1e2a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-25-027177.hdr.sgml**: 20251120

**ACCESSION NUMBER**: 0001410368-25-027177

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20250930

**FILED AS OF DATE**: 20251120

**DATE AS OF CHANGE**: 20251120

**PERIOD START**: 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:** NPORT-P
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-04419
- **FILM NUMBER:** 251501198

**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 Market Participation Strategy VP (Series ID: S000036845)

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

## Nport-Ex

**Transamerica Market Participation Strategy VP**

------

**SCHEDULE OF INVESTMENTS**

**At September 30, 2025**

**(unaudited)**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

---

| | | |
|:---|:---|:---|
|  | **Principal** | **Value** |
| **U.S. GOVERNMENT OBLIGATIONS - 23.8%**  | **U.S. GOVERNMENT OBLIGATIONS - 23.8%**  | **U.S. GOVERNMENT OBLIGATIONS - 23.8%**  |
| **U.S. Treasury - 23.8%**  | **U.S. Treasury - 23.8%**  | **U.S. Treasury - 23.8%**  |
| U.S. Treasury Bonds, Principal Only <br> STRIPS |  |  |
| 02/15/2027 | $18000000 | $17139668 |
| U.S. Treasury Notes |  |  |
| 1.63%, 10/31/2026 | 41000000 | 40103125 |
| 3.63%, 09/30/2031 | 12000000 | 11859375 |
| &nbsp;&nbsp; **Total U.S. Government Obligations** <br>**(Cost $70,679,611)**<br>|  | 69102168 |
| **U.S. GOVERNMENT AGENCY OBLIGATIONS - 16.3%**  | **U.S. GOVERNMENT AGENCY OBLIGATIONS - 16.3%**  | **U.S. GOVERNMENT AGENCY OBLIGATIONS - 16.3%**  |
| Federal Home Loan Banks |  |  |
| 3.25%, 11/16/2028 <sup>(A)</sup> <br>| 29000000 | 28743232 |
| Federal National Mortgage Association |  |  |
| 6.25%, 05/15/2029 <sup>(A)</sup> <br>| 6500000 | 7066455 |
| 7.25%, 05/15/2030 | 10000000 | 11480527 |
| &nbsp;&nbsp; **Total U.S. Government Agency Obligations** <br>**(Cost $48,843,176)** | &nbsp;&nbsp; **Total U.S. Government Agency Obligations** <br>**(Cost $48,843,176)** | 47290214 |
| **FOREIGN GOVERNMENT OBLIGATIONS - 10.6%**  | **FOREIGN GOVERNMENT OBLIGATIONS - 10.6%**  | **FOREIGN GOVERNMENT OBLIGATIONS - 10.6%**  |
| **Supranational - 10.6%**  | **Supranational - 10.6%**  | **Supranational - 10.6%**  |
| European Investment Bank |  |  |
| 3.88%, 03/15/2028 | 7000000 | 7035052 |
| Inter-American Development Bank |  |  |
| 4.00%, 01/12/2028 | 7000000 | 7047838 |
| &nbsp;&nbsp; International Bank for Reconstruction & <br> Development<br>|  |  |
| 0.88%, 07/15/2026 | 17000000 | 16607892 |
| &nbsp;&nbsp; **Total Foreign Government Obligations** <br>**(Cost $31,012,626)**<br>|  | 30690782 |
| **SHORT-TERM U.S. GOVERNMENT OBLIGATIONS - 22.9%**  | **SHORT-TERM U.S. GOVERNMENT OBLIGATIONS - 22.9%**  | **SHORT-TERM U.S. GOVERNMENT OBLIGATIONS - 22.9%**  |
| U.S. Treasury Bills |  |  |
| 3.92% <sup>(B)</sup>, 12/02/2025 | 35000000 | 34765218 |
| 4.34% <sup>(B)</sup>, 11/04/2025 <sup>(C)</sup> <br>| 32000000 | 31878678 |
| &nbsp;&nbsp; **Total Short-Term U.S. Government Obligations** <br>**(Cost $66,630,567)** | &nbsp;&nbsp; **Total Short-Term U.S. Government Obligations** <br>**(Cost $66,630,567)** | 66643896 |

---

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

---

| | | |
|:---|:---|:---|
|  | **Shares** | **Value** |
| **OTHER INVESTMENT COMPANY - 11.9%**  | **OTHER INVESTMENT COMPANY - 11.9%**  | **OTHER INVESTMENT COMPANY - 11.9%**  |
| **Securities Lending Collateral - 11.9%**  | **Securities Lending Collateral - 11.9%**  | **Securities Lending Collateral - 11.9%**  |
| &nbsp;&nbsp; State Street Navigator Securities Lending <br> Trust - Government Money Market Portfolio, <br> 4.13% <sup>(B)</sup> <br>| 34486481 | $34486481 |
| &nbsp;&nbsp; **Total Other Investment Company** <br>**(Cost $34,486,481)** | &nbsp;&nbsp; **Total Other Investment Company** <br>**(Cost $34,486,481)** | 34486481 |

---

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

---

| | | |
|:---|:---|:---|
|  | **Principal** | **Value** |
| **REPURCHASE AGREEMENT - 4.1%**  | **REPURCHASE AGREEMENT - 4.1%**  | **REPURCHASE AGREEMENT - 4.1%**  |
| &nbsp;&nbsp; Fixed Income Clearing Corp., <br>1.65% <sup>(B)</sup>, dated 09/30/2025, to be <br> repurchased at $11,843,480 on 10/01/2025. <br> Collateralized by a U.S. Government <br> Obligation, 2.50%, due 03/31/2027, and <br> with a value of $12,079,852.<br>| $11842938 | 11842938 |
| &nbsp;&nbsp; **Total Repurchase Agreement** <br>**(Cost $11,842,938)** | &nbsp;&nbsp; **Total Repurchase Agreement** <br>**(Cost $11,842,938)** | 11842938 |
| &nbsp;&nbsp; **Total Investments Excluding Options Purchased** <br>**(Cost $263,495,399)** | &nbsp;&nbsp; **Total Investments Excluding Options Purchased** <br>**(Cost $263,495,399)** | 260056479 |
| &nbsp;&nbsp; **Total Options Purchased - 22.1%** <br>**(Cost $45,747,563)** | &nbsp;&nbsp; **Total Options Purchased - 22.1%** <br>**(Cost $45,747,563)** | 64184892 |
| &nbsp;&nbsp; **Total Investments** <br>**(Cost $309,242,962)** | &nbsp;&nbsp; **Total Investments** <br>**(Cost $309,242,962)** | 324241371 |
| **Net Other Assets (Liabilities) - (11.7)%** | **Net Other Assets (Liabilities) - (11.7)%** | (33891873) |
| **Net Assets - 100.0%** | **Net Assets - 100.0%** | **$290349498** |

---

**OVER-THE-COUNTER OPTIONS PURCHASED:**

------

---

| | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| **Description** | **Counterparty** | &nbsp;&nbsp; **Exercise** <br>**Price** | &nbsp;&nbsp; **Exercise** <br>**Price** | **Expiration** <br>**Date**<br>| &nbsp;&nbsp; **Notional** <br>**Amount** | &nbsp;&nbsp; **Notional** <br>**Amount** | **Number of** <br>**Contracts**<br>| **Premiums** <br>**Paid**<br>| **Value** |
| Call – S&P 500<sup>®</sup> Index | UBS | USD | &nbsp;&nbsp; 5450.00 | &nbsp;&nbsp; 06/11/2029 | USD | &nbsp;&nbsp; 90294210 | &nbsp;&nbsp; 135 | &nbsp;&nbsp; $17955068 | &nbsp;&nbsp; $28913080 |
| Call – S&P 500<sup>®</sup> Index | GSC | USD | &nbsp;&nbsp; 6100.00 | &nbsp;&nbsp; 01/31/2030 | USD | &nbsp;&nbsp; 127080740 | &nbsp;&nbsp; 190 | &nbsp;&nbsp; 27792495 | &nbsp;&nbsp; 35271812 |
| **Total** |  |  |  |  |  |  |  | &nbsp;&nbsp; **$45747563** | &nbsp;&nbsp; **$64184892** |

---

**FUTURES CONTRACTS:**

------

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| **Long Futures Contracts**  | **Long Futures Contracts**  | **Long Futures Contracts**  | **Long Futures Contracts**  | **Long Futures Contracts**  | **Long Futures Contracts**  | **Long Futures Contracts**  |
| **Description** | **Number of** <br>**Contracts**<br>| &nbsp;&nbsp; **Expiration** <br>**Date**<br>| &nbsp;&nbsp; **Notional** <br>**Amount**<br>| **Value** | &nbsp;&nbsp; **Unrealized** <br>**Appreciation**<br>| &nbsp;&nbsp; **Unrealized** <br>**Depreciation**<br>|
| 2-Year U.S. Treasury Notes | 10 | &nbsp;&nbsp;&nbsp;&nbsp; 12/31/2025 | &nbsp;&nbsp;&nbsp;&nbsp; $2084313 | &nbsp;&nbsp;&nbsp;&nbsp; $2083984 | &nbsp;&nbsp;&nbsp;&nbsp; $— | &nbsp;&nbsp;&nbsp;&nbsp; $(329)<br>|
| 5-Year U.S. Treasury Notes | 249 | &nbsp;&nbsp;&nbsp;&nbsp; 12/31/2025 | &nbsp;&nbsp;&nbsp;&nbsp; 27193934 | &nbsp;&nbsp;&nbsp;&nbsp; 27189633 | &nbsp;&nbsp;&nbsp;&nbsp; — | &nbsp;&nbsp;&nbsp;&nbsp; (4301)<br>|
| 10-Year U.S. Treasury Notes | 285 | &nbsp;&nbsp;&nbsp;&nbsp; 12/19/2025 | &nbsp;&nbsp;&nbsp;&nbsp; 31983106 | &nbsp;&nbsp;&nbsp;&nbsp; 32062500 | &nbsp;&nbsp;&nbsp;&nbsp; 79394 | &nbsp;&nbsp;&nbsp;&nbsp; — |
| 30-Year U.S. Treasury Bonds | 64 | &nbsp;&nbsp;&nbsp;&nbsp; 12/19/2025 | &nbsp;&nbsp;&nbsp;&nbsp; 7339792 | &nbsp;&nbsp;&nbsp;&nbsp; 7462000 | &nbsp;&nbsp;&nbsp;&nbsp; 122208 | &nbsp;&nbsp;&nbsp;&nbsp; — |
| **Total** | **Total** | **Total** | **Total** | **Total** | &nbsp;&nbsp;&nbsp; **$201602** | &nbsp;&nbsp;&nbsp; **$(4630)**<br>|

---

**Transamerica Series Trust**

**Page 1**

------

**Transamerica Market Participation Strategy VP**

------

**SCHEDULE OF INVESTMENTS (continued)**

**At September 30, 2025**

**(unaudited)**

**FUTURES CONTRACTS (continued):**

------

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| **Short Futures Contracts**  | **Short Futures Contracts**  | **Short Futures Contracts**  | **Short Futures Contracts**  | **Short Futures Contracts**  | **Short Futures Contracts**  | **Short Futures Contracts**  |
| **Description** | **Number of** <br>**Contracts**<br>| &nbsp;&nbsp; **Expiration** <br>**Date**<br>| &nbsp;&nbsp; **Notional** <br>**Amount**<br>| **Value** | &nbsp;&nbsp; **Unrealized** <br>**Appreciation**<br>| &nbsp;&nbsp; **Unrealized** <br>**Depreciation**<br>|
| S&P 500<sup>®</sup> E-Mini Index | (10)<br>| &nbsp;&nbsp;&nbsp;&nbsp; 12/19/2025 | &nbsp;&nbsp;&nbsp;&nbsp; $(3375507)<br>| &nbsp;&nbsp;&nbsp;&nbsp; $(3369375)<br>| &nbsp;&nbsp;&nbsp;&nbsp; $6132 | &nbsp;&nbsp;&nbsp;&nbsp; $— |
| **Total Futures Contracts** | **Total Futures Contracts** | **Total Futures Contracts** | **Total Futures Contracts** | **Total Futures Contracts** | &nbsp;&nbsp;&nbsp; **$207734** | &nbsp;&nbsp;&nbsp; **$(4630)**<br>|

---

**INVESTMENT VALUATION:**

------

---

| | | | | |
|:---|:---|:---|:---|:---|
| **Valuation Inputs** <sup>(D)</sup> <br>|  |  |  |  |
|  | **Level 1 -** <br>**Unadjusted** <br>**Quoted Prices**<br>| **Level 2 -** <br>**Other Significant** <br>**Observable Inputs**<br>| **Level 3 -** <br>**Significant** <br>**Unobservable Inputs**<br>| **Value** |
| **ASSETS** |  |  |  |  |
| **Investments** |  |  |  |  |
| U.S. Government Obligations | $— | &nbsp;&nbsp; $69102168 | &nbsp;&nbsp; $— | &nbsp;&nbsp; $69102168 |
| U.S. Government Agency Obligations |  | &nbsp;&nbsp; 47290214 | &nbsp;&nbsp; — | &nbsp;&nbsp; 47290214 |
| Foreign Government Obligations |  | &nbsp;&nbsp; 30690782 | &nbsp;&nbsp; — | &nbsp;&nbsp; 30690782 |
| Short-Term U.S. Government Obligations |  | &nbsp;&nbsp; 66643896 | &nbsp;&nbsp; — | &nbsp;&nbsp; 66643896 |
| Other Investment Company | 34486481 | &nbsp;&nbsp; — | &nbsp;&nbsp; — | &nbsp;&nbsp; 34486481 |
| Repurchase Agreement |  | &nbsp;&nbsp; 11842938 | &nbsp;&nbsp; — | &nbsp;&nbsp; 11842938 |
| Over-the-Counter Options Purchased |  | &nbsp;&nbsp; 64184892 | &nbsp;&nbsp; — | &nbsp;&nbsp; 64184892 |
| **Total Investments** | **$34486481** | &nbsp;&nbsp; **$289754890** | &nbsp;&nbsp; **$—** | &nbsp;&nbsp; **$324241371** |
| **Other Financial Instruments** |  |  |  |  |
| Futures Contracts <sup>(E)</sup> <br>| $207734 | &nbsp;&nbsp; $— | &nbsp;&nbsp; $— | &nbsp;&nbsp; $207734 |
| **Total Other Financial Instruments** | **$207734** | &nbsp;&nbsp; **$—** | &nbsp;&nbsp; **$—** | &nbsp;&nbsp; **$207734** |
| **LIABILITIES** |  |  |  |  |
| **Other Financial Instruments** |  |  |  |  |
| Futures Contracts <sup>(E)</sup> <br>| $(4630)<br>| &nbsp;&nbsp; $— | &nbsp;&nbsp; $— | &nbsp;&nbsp; $(4630)<br>|
| **Total Other Financial Instruments** | **$(4630)**<br>| &nbsp;&nbsp; **$—** | &nbsp;&nbsp; **$—** | &nbsp;&nbsp; **$(4630)**<br>|

---

**FOOTNOTES TO SCHEDULE OF INVESTMENTS:** 

<sup>(A)</sup> *All or a portion of the security is on loan. The total value of the securities on loan is $33,806,907, collateralized by cash collateral of $34,486,481. The* *amount on loan indicated may not correspond with the securities on loan identified because a security with pending sales are in the process of recall* *from the brokers.* 

<sup>(B)</sup> *Rate disclosed reflects the yield at September 30, 2025.*

<sup>(C)</sup> *All or a portion of the security has been segregated by the custodian as collateral to cover margin requirements for open futures contracts. The total* *value of the securities is $1,992,416.* 

<sup>(D)</sup> *There were no transfers in or out of Level 3 during the period ended September 30, 2025. Please reference the Investment Valuation section of the* *Notes to Schedule of Investments for more information regarding investment valuation and pricing inputs.* 

<sup>(E)</sup> *Derivative instruments are valued at unrealized appreciation (depreciation).*

**COUNTERPARTY ABBREVIATION(S):** 

*GSC* *Goldman Sachs & Co.* <br> *UBS* *UBS AG*

**PORTFOLIO ABBREVIATION(S):** 

*STRIPS* *Separate Trading of Registered Interest and Principal of Securities*

**Transamerica Series Trust**

**Page 2**

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**Transamerica Market Participation Strategy VP**

------

**NOTES TO SCHEDULE OF INVESTMENTS**

**At September 30, 2025**

**(unaudited)**

**INVESTMENT VALUATION**

Transamerica Market Participation Strategy VP (the "Portfolio") is a series of the Transamerica Series Trust.

Transamerica Asset Management, Inc. ("TAM") has been designated as the Portfolio's valuation designee pursuant to Rule 2a-5 under the Investment Company Act of 1940, as amended, with responsibility for fair valuation subject to oversight by the Portfolio's Board of Trustees. The net asset value of the Portfolio is computed as of the official close of the New York Stock Exchange ("NYSE") each day the NYSE is open for business.

TAM utilizes various methods to measure the fair value of its investments on a recurring basis. Generally Accepted Accounting Principles in the United States of America establishes a hierarchy that prioritizes inputs to valuation methods. The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities. The three levels ("Levels") of inputs of the fair value hierarchy are defined as follows:

Level 1—Unadjusted quoted prices in active markets for identical securities.

Level 2—Inputs, other than quoted prices included in Level 1, which are observable, either directly or indirectly. These inputs may include quoted prices for the identical instrument on an inactive market, prices for similar instruments, interest rates, prepayment speeds, credit risk, yield curves, default rates, and similar data.

Level 3—Unobservable inputs based on the best information available in the circumstances, to the extent observable inputs are not available, which may include TAM's own assumptions used in determining the fair value of the Portfolio's investments and derivative instruments.

The inputs used to measure fair value may fall into different Levels of the fair value hierarchy. In such cases, for disclosure purposes, the Level in the fair value hierarchy that is assigned to the fair value measurement of a security is determined based on the lowest Level input that is significant to the fair value measurement in its entirety. Certain investments that are measured at fair value using Net Asset Value ("NAV") per share, or its equivalent, using the "practical expedient" have not been classified in the fair value Levels. The hierarchy classification of inputs used to value the Portfolio's investments at September 30, 2025, is disclosed within the Investment Valuation section of the Schedule of Investments.

The availability of observable inputs can vary from security to security and is affected by a wide variety of factors, including, but not limited to, the type of security, whether the security is new and not yet established in the marketplace, the liquidity of markets, and other characteristics particular to the security. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised in determining fair value is generally greatest for instruments categorized in Level 3. Due to the inherent uncertainty of valuation, the determination of values may differ significantly from values that would have been realized had a ready market for investments existed, and the differences could be material.

**Fair value measurements:** Descriptions of the valuation techniques applied to the Portfolio's significant categories of assets and liabilities measured at fair value on a recurring basis are as follows:

*Foreign government obligations:* Foreign government obligations are normally valued using a model that incorporates market observable data such as reported sales of similar securities, broker quotes, yields, bids, offers, and reference data. Certain securities are valued by principally using dealer quotations. Foreign government obligations generally are categorized in Level 2 of the fair value hierarchy, or Level 3 if inputs are unobservable.

*U.S. government agency obligations:* U.S. government agency obligations are comprised of two main categories consisting of agency issued debt and mortgage pass-throughs. Generally, agency issued debt securities are valued in a manner similar to U.S. government obligations. Mortgage pass-throughs include to be announced ("TBA") securities and mortgage pass-through certificates. Generally, TBA securities and mortgage pass-throughs are valued using dealer quotations. Depending on market activity levels and whether quotations or other observable data are used, these securities are typically categorized in Level 2 of the fair value hierarchy; otherwise they would be categorized in Level 3.

**Transamerica Series Trust**

**Page 3**

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**Transamerica Market Participation Strategy VP**

------

**NOTES TO SCHEDULE OF INVESTMENTS (continued)**

**At September 30, 2025**

**(unaudited)**

*U.S. government obligations:* U.S. government obligations are normally valued using a model that incorporates market observable data such as reported sales of similar securities, broker quotes, yields, bids, offers, and reference data. Certain securities are valued by principally using dealer quotations. U.S. government obligations generally are categorized in Level 2 of the fair value hierarchy, or Level 3 if inputs are unobservable.

*Short-term notes:* The Portfolio normally values short-term government and U.S. government agency securities using a model that incorporates market observable data such as reported sales of similar securities, broker quotes, yields, bids, offers and reference data. Certain securities are valued by principally using dealer quotations. Short-term government and U.S. government agency securities generally are categorized in Level 2 of the fair value hierarchy, or Level 3 if inputs are unobservable.

*Securities lending collateral:* Securities lending collateral is invested in a money market fund which is valued at the actively traded NAV and no valuation adjustments are applied. Securities lending collateral is categorized in Level 1 of the fair value hierarchy.

*Repurchase agreements:* Repurchase agreements are valued at cost, which approximates fair value. To the extent the inputs are observable and timely, the values are generally categorized in Level 2 of the fair value hierarchy.

*Derivative instruments:* Centrally cleared or listed derivatives that are actively traded are valued based on quoted prices from the exchange and are categorized in Level 1 of the fair value hierarchy. Over-the-counter ("OTC") derivative contracts include forward, swap, swaption, and option contracts related to interest rates, foreign currencies, credit standing of reference entities, equity prices, or commodity prices. Depending on the product and the terms of the transaction, the fair value of the OTC derivative products are modeled taking into account the counterparties' creditworthiness and using a series of techniques, including simulation models. Many pricing models do not entail material subjectivity because the methodologies employed do not necessitate significant judgments and the pricing inputs are observed from actively quoted markets, as is the case of interest rate swap and option contracts. The majority of OTC derivative products valued by the Portfolio using pricing models fall into this category and are categorized within Level 2 of the fair value hierarchy or Level 3 if inputs are unobservable.

**Transamerica Series Trust**

**Page 4**

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## Form NPORT-P: Monthly Portfolio Investments Report

### NPORT-P: Part A: General Information

**Item A.1. Information about the Registrant.**

- **a. Name of Registrant:** TRANSAMERICA SERIES TRUST

- **b. Investment Company Act file number:** 811-04419

- **c. CIK number of Registrant:** 0000778207

- **d. LEI of Registrant:** 5493000QR1WGXIM5V222

- **e. Address and telephone number of Registrant.**

  - **Street Address 1:** 1801 CALIFORNIA STREET

  - **City:** DENVER

  - **State:** CO

  - **Foreign country:** US

  - **Zip / Postal Code:** 80202

  - **Telephone number:** 720-493-4256

**Item A.2. Information about the Series.**

- **a. Name of Series:** Transamerica Market Participation Strategy VP

- **b. EDGAR series identifier (if any):** S000036845

- **c. LEI of Series:** 549300ZQ8NH1BMKMLA21

**Item A.3. Reporting period.**

- **a. Date of fiscal year-end:** 2025-12-31

- **b. Date as of which information is reported:** 2025-09-30

**Item A.4. Final filing**

Does the Fund anticipate that this will be its final filing on Form N-PORT? **No**

### Fund Information

**Total Assets:** $359746256.42

**Total Liabilities:** $69129344.03

**Net Assets:** $290616912.39

**Currency Risk Metrics (dv01):**

- 

**Credit Spread Risk - Investment Grade (dv01):**

- **3-Month:** -419.50000000 | **1-Year:** -8786.30000000 | **5-Year:** -10962.52000000 | **10-Year:** 0.00000000 | **30-Year:** 0.00000000

**Credit Spread Risk - Non-Investment Grade (dv01):**

- **3-Month:** 0.00000000 | **1-Year:** 0.00000000 | **5-Year:** 0.00000000 | **10-Year:** 0.00000000 | **30-Year:** 0.00000000

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000112680 | 1.20%                | 1.28%                | 2.72%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $-284566.25              | $-44440.28                                 |
| Month 2  | $-418115.37              | $1600480.35                                |
| Month 3  | $0.00                    | $197229.63                                 |

**Designated Index Information**

- **Index Name:** Securities Portfolio VaR

- **Index Identifier:** Designated Reference Portfolio is the Fund's Securities Portfolio

### Schedule of Portfolio Investments

| Name                         | Title                                                                       | Identifiers                                   | Payoff Profile   | Asset Category   | Issuer Category   | Country   |   Balance | Units   | Value (USD)   | % of Net Assets   | Maturity Date   | Coupon Type   | Annualized Rate (%)   | Restricted?   |   Fair Value Level | Lending Status   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| EUROPEAN INVESTMENT BANK     | European Investment Bank                                                    | CUSIP: 298785JU1<br>LEI: 5493006YXS1U5GIHE750 | Long             | DBT              | NUSS              | XX        |   7000000 | PA      | $7035052.15   | 2.42%             | 2028-03-15      | Fixed         | 3.88%                 | No            |                  2 | On Loan: No      |
| State Street Global Advisors | State Street Navigator Securities Lending Government Money Market Portfolio | CUSIP: 857509301<br>LEI: 5493008BJIBKQ5KTIF74 | Long             | STIV             | RF                | US        |  34426025 | NS      | $34426025.00  | 11.85%            |  |  |  | No            |                  1 | On Loan: No      |
| Chicago Board of Trade       | Future                                                                      | CUSIP: 000000000<br>LEI: 549300EX04Q2QBFQTQ27 | N/A              | DIR              |  | US        |        10 | NC      | $-328.98      | -0.00%            |  |  |  | No            |                  1 | On Loan: No      |
| INTER-AMERICAN DEVEL BK      | Inter-American Development Bank                                             | CUSIP: 4581X0EH7<br>LEI: VKU1UKDS9E7LYLMACP54 | Long             | DBT              | NUSS              | XX        |   7000000 | PA      | $7047837.72   | 2.43%             | 2028-01-12      | Fixed         | 4.00%                 | No            |                  2 | On Loan: No      |
| UBS Securities LLC           | Option                                                                      | CUSIP: 000000000<br>LEI: T6FIZBDPKLYJKFCRVK44 | N/A              | DE               |  | US        |       135 | NC      | $28913079.98  | 9.95%             |  |  |  | No            |                  2 | On Loan: No      |
| Goldman Sachs & Co. LLC      | Option                                                                      | CUSIP: 000000000<br>LEI: FOR8UP27PHTHYVLBNG30 | N/A              | DE               |  | US        |       190 | NC      | $35271812.44  | 12.14%            |  |  |  | No            |                  2 | On Loan: No      |
| United States Treasury       | U.S. Treasury Notes                                                         | CUSIP: 91282CLM1<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  12000000 | PA      | $11859375.00  | 4.08%             | 2031-09-30      | Fixed         | 3.63%                 | No            |                  2 | On Loan: No      |
| United States Treasury       | U.S. Treasury Bonds, Principal Only STRIPS                                  | CUSIP: 912833PC8<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  18000000 | PA      | $17139667.86  | 5.90%             | 2027-02-15      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| Chicago Board of Trade       | Future                                                                      | CUSIP: 000000000<br>LEI: 549300EX04Q2QBFQTQ27 | N/A              | DIR              |  | US        |        64 | NC      | $122207.80    | 0.04%             |  |  |  | No            |                  1 | On Loan: No      |
| Chicago Board of Trade       | Future                                                                      | CUSIP: 000000000<br>LEI: 549300EX04Q2QBFQTQ27 | N/A              | DIR              |  | US        |       249 | NC      | $-4301.22     | -0.00%            |  |  |  | No            |                  1 | On Loan: No      |
| Fannie Mae                   | Federal National Mortgage Association                                       | CUSIP: 31359MEU3<br>LEI: B1V7KEBTPIMZEU4LTD58 | Long             | DBT              | USGSE             | US        |   6500000 | PA      | $7066455.31   | 2.43%             | 2029-05-15      | Fixed         | 6.25%                 | No            |                  2 | On Loan: —       |
| Fixed Income Clearing Corp   | FIXED INC CLEARING CORP.REPO                                                | CUSIP: 000000000<br>LEI: 549300H47WTHXPU08X20 | Long             | RA               | CORP              | US        |  11842938 | PA      | $11842937.65  | 4.08%             |  |  |  | No            |                  2 | On Loan: No      |
| INTL BK RECON & DEVELOP      | International Bank for Reconstruction & Development                         | CUSIP: 459058JX2<br>LEI: ZTMSNXROF84AHWJNKQ93 | Long             | DBT              | NUSS              | XX        |  17000000 | PA      | $16607892.28  | 5.71%             | 2026-07-15      | Fixed         | 0.88%                 | No            |                  2 | On Loan: No      |
| Fannie Mae                   | Federal National Mortgage Association                                       | CUSIP: 31359MFP3<br>LEI: B1V7KEBTPIMZEU4LTD58 | Long             | DBT              | USGSE             | US        |  10000000 | PA      | $11480526.60  | 3.95%             | 2030-05-15      | Fixed         | 7.25%                 | No            |                  2 | On Loan: No      |
| Chicago Mercantile Exchange  | Future                                                                      | CUSIP: 000000000<br>LEI: SNZ2OJLFK8MNNCLQOF39 | N/A              | DE               |  | US        |       -10 | NC      | $6132.00      | 0.00%             |  |  |  | No            |                  1 | On Loan: No      |
| Chicago Board of Trade       | Future                                                                      | CUSIP: 000000000<br>LEI: 549300EX04Q2QBFQTQ27 | N/A              | DIR              |  | US        |       285 | NC      | $79394.39     | 0.03%             |  |  |  | No            |                  1 | On Loan: No      |
| United States Treasury       | U.S. Treasury Bills                                                         | CUSIP: 912797RR0<br>LEI: 254900HROIFWPRGM1V77 | Long             | STIV             | UST               | US        |  35000000 | PA      | $34765217.90  | 11.96%            | 2025-12-02      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| FEDERAL HOME LOAN BANK       | Federal Home Loan Banks                                                     | CUSIP: 3130AFFX0<br>LEI: 2549001DPIFGXC1TOL40 | Long             | DBT              | USGSE             | US        |  29000000 | PA      | $28743231.68  | 9.89%             | 2028-11-16      | Fixed         | 3.25%                 | No            |                  2 | On Loan: —       |
| United States Treasury       | U.S. Treasury Notes                                                         | CUSIP: 912828YQ7<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  41000000 | PA      | $40103125.00  | 13.80%            | 2026-10-31      | Fixed         | 1.63%                 | No            |                  2 | On Loan: No      |
| United States Treasury       | U.S. Treasury Bills                                                         | CUSIP: 912797RM1<br>LEI: 254900HROIFWPRGM1V77 | Long             | STIV             | UST               | US        |  32000000 | PA      | $31878678.40  | 10.97%            | 2025-11-04      | None          | 0.00%                 | No            |                  2 | On Loan: No      |

### Signature

**Date Signed:** 2025-10-28

**Name of Applicant:** TRANSAMERICA SERIES TRUST

**Signature:** Kari Seabrands

**Name of Signer:** Kari Seabrands

**Title:** Treasurer