# EDGAR Filing Document

**Accession Number:** 0000778207
**File Stem:** 0001193125-26-197215
**Filing Date:** 2026-4
**Character Count:** 27938
**Document Hash:** 7622ab68d851f1161c99d07d7f68df46
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-197215.hdr.sgml**: 20260430

**ACCESSION NUMBER**: 0001193125-26-197215

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 4

**FILED AS OF DATE**: 20260430

**DATE AS OF CHANGE**: 20260430

**EFFECTIVENESS DATE**: 20260430

**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:** 26925218

**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 BlackRock Government Money Market VP (Series ID: S000007924)

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

![](g29247tf_blacknotrust.jpg)

**Transamerica BlackRock Government Money Market VP**

**Summary Prospectus May 1, 2026**

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Class Initial & Service (No Ticker)

This summary prospectus is designed to provide shareholders with key portfolio information in a clear and concise format. Before you invest, you may want to review the portfolio's prospectus, which contains more information about the portfolio and its risks. You can find the portfolio's prospectus, reports to shareholders, and other information about the portfolio, including the portfolio's statement of additional information, online at https://www.transamerica.com/financial-pro/annuities/prospectus. You can also get this information at no cost by calling 866-414-6349 or by sending an e-mail request to orders@mysummaryprospectus.com, or from your financial professional. The portfolio's prospectus and statement of additional information, both dated May 1, 2026, as supplemented from time to time, are incorporated by reference into this summary prospectus.

**Investment Objective:** Seeks as high a level of current income as is consistent with preservation of capital and liquidity.

**Fees and Expenses:** This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the portfolio, but it does not reflect any charges that are, or may be, imposed under your variable life insurance policy or variable annuity contract. If such charges were reflected, fees would be higher.

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**Shareholder Fees (fees paid directly from your investment)** 

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| | | |
|:---|:---|:---|
| **Class:** | **Initial**  | **Service**  |
| Maximum sales charge (load) imposed on purchases <br> (as a percentage of offering price)<br>| None | None |
| Maximum deferred sales charge (load) (as a <br> percentage of purchase price or redemption <br> proceeds, whichever is lower)<br>| None | None |

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**Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)** 

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| | | |
|:---|:---|:---|
| **Class:** | **Initial** | **Service** |
| Management fees | 0.24% | 0.24% |
| Distribution and service (12b-1) fees |  | 0.25% |
| Other expenses | 0.05% | 0.05% |
| Total annual fund operating expenses | 0.29% | 0.54% |

---

**Example:** This Example is intended to help you compare the cost of investing in the portfolio with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in the portfolio for the time periods indicated and then redeem all shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the portfolio's operating expenses remain the same. The Example does not reflect charges that are, or may be, imposed under your variable life insurance policy or variable annuity contract. If such charges were reflected, costs would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

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| | | | | |
|:---|:---|:---|:---|:---|
|  | **1 year** | **3 years** | **5 years** | **10 years** |
| Initial Class | &nbsp;&nbsp; $30 | &nbsp;&nbsp; $93 | &nbsp;&nbsp; $163 | &nbsp;&nbsp; $368 |
| Service Class | &nbsp;&nbsp; $55 | &nbsp;&nbsp; $173 | &nbsp;&nbsp; $302 | &nbsp;&nbsp; $677 |

---

**Principal Investment Strategies:** The portfolio is a government money market fund. The portfolio seeks to maintain a stable net asset value of $1.00 per share by investing in:

• high-quality, U.S. dollar-denominated short-term money market securities issued or guaranteed as to principal or interest by the U.S. government or its agencies or instrumentalities;

• repurchase agreements that are fully collateralized by U.S. government securities or cash; and

• cash.

The portfolio's sub-adviser, BlackRock Investment Management, LLC (the "sub-adviser"), invests at least 99.5% of the portfolio's total assets (plus the amount of borrowings, if any, for investment purposes) in cash, U.S. Treasury bills, notes and other obligations issued or guaranteed as to principal and interest by the U.S. Government, its agencies or instrumentalities, and repurchase agreements fully collateralized by such obligations or cash. Under normal circumstances, the portfolio invests at least 80% of its net assets (plus the amount of borrowings, if any, for investment purposes) in U.S. Treasury bills, notes and other obligations issued or guaranteed as to principal and interest by the U.S. Government, its agencies or instrumentalities, and repurchase agreements fully collateralized by such obligations.

The portfolio will enter into repurchase agreements only with financial institutions that the sub-adviser determines are creditworthy. A financial institution must furnish collateral to the portfolio at least equal in value to the amount of its repurchase obligation. This collateral must consist of U.S. government securities or cash. The sub-adviser is responsible for ensuring that each repurchase agreement is eligible for purchase by the portfolio.

The portfolio invests in accordance with the quality, maturity, liquidity and diversification requirements of Rule 2a-7 under the Investment Company Act of 1940 and other rules of the Securities and Exchange Commission.

The portfolio may invest in variable and floating rate instruments, and transact in securities on a when-issued, delayed delivery or forward commitment basis. The portfolio may invest in other government money market funds to the extent permitted by law.

If the portfolio takes a temporary defensive position, it will be more difficult for the portfolio to achieve its investment objective. Although the sub-adviser has the ability to take temporary defensive positions, it may choose not to do so for a variety of reasons, including during volatile market conditions.

**Principal Risks: You could lose money by investing in the portfolio.** Although the portfolio seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do

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so. An investment in the portfolio is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The portfolio's sponsor is not required to reimburse the portfolio for losses, and you should not expect that the sponsor will provide financial support to the portfolio at any time, including during periods of market stress.

You should be aware that money market funds have, in the past, "broken the buck," which means that investors did not receive $1.00 per share for their investment in those funds, and this could happen again. If a money market fund breaks the buck or if money market funds are perceived to be likely to do so, there could be significant redemptions from money market funds, driving market prices of securities down and making it more difficult for the fund to maintain a $1.00 per share net asset value.

If one or more money market funds were to incur a sizeable loss or impose fees on redemptions or suspend redemptions, there could be significant redemptions from money market funds in general, potentially driving the market prices of money market instruments down and adversely affecting market liquidity.

There is no assurance that the portfolio will meet its investment objective. The portfolio could underperform short-term debt instruments, other money market funds or similar investments, or you could lose money. The following is a summary description of principal risks (in alphabetical order after certain key risks) of investing in the portfolio. The relative significance of the key risks below may change over time and you should review each risk factor carefully.

**Market** – Factors such as economic events, inflation, changes in interest rates, governmental actions or interventions, actions taken by the U.S. Federal Reserve or foreign central banks, market disruptions caused by tariffs, trade disputes, labor strikes, supply chain disruptions or other factors, government shutdowns, political developments, civil unrest, acts of terrorism, armed conflicts, economic sanctions, countermeasures in response to sanctions, cybersecurity events, technological developments (such as artificial intelligence and machine learning), investor sentiment, the global and domestic effects of widespread or local health, weather or climate events, lack of liquidity or other disruptions in the bond markets, or other adverse market events and conditions could cause the value of your investment in the portfolio, or its yield, to decline. While the portfolio seeks to maintain a $1.00 share price, when market prices fall, the value of your investment in the portfolio could go down.

Economies and financial markets throughout the world are increasingly interconnected. Events or circumstances in one or more countries or regions could be highly disruptive to, and have profound impacts on, global economies or markets. As a result, whether or not the portfolio invests in securities of issuers located in or with significant exposure to the countries directly affected, the value and liquidity of the portfolio's investments may go down.

The long-term consequences to the U.S. economy of the continued expansion of U.S. government debt and deficits are not known. Also, raising the ceiling on U.S. government debt and periodic legislation to fund the government have become increasingly politicized. Any failure to do either could lead to a default on U.S. government obligations, with unpredictable consequences

for the portfolio's investments and the portfolio's ability to preserve the value of your investment at $1.00 per share, and generally for economies and markets in the U.S. and elsewhere.

**Government Money Market Fund –** The portfolio operates as a "government" money market fund under applicable federal regulations and invests in U.S. government securities. Circumstances could arise that would prevent the payment of interest or principal on U.S. government securities, which could adversely affect their value and the portfolio's ability to preserve the value of your investment at $1.00 per share. An increased demand for U.S. government securities could affect the availability of such instruments for investment and the portfolio's ability to pursue its investment strategies. The portfolio does not currently intend to avail itself of the ability to impose "liquidity fees" on portfolio redemptions, as permitted under Rule 2a-7. However, the Board reserves the right, with notice to shareholders, to change this policy.

**Interest Rate –** The interest rates on short-term obligations held in the portfolio will vary, rising or falling with short-term interest rates generally. The portfolio's yield will tend to lag behind general changes in interest rates. Changes in interest rates can be sudden and unpredictable and may expose the markets to significant volatility, which also may affect the liquidity of the portfolio's investments and detract from portfolio performance. A variety of factors can impact interest rates, including central bank monetary policies and inflation rates. A general rise in interest rates may cause investors to sell fixed-income securities on a large scale, which could adversely affect the price and liquidity of fixed-income securities and could also result in increased redemptions from the portfolio. Inflation and interest rates have been volatile and may increase in the future. Interest rate increases in the future may cause the value of fixed-income securities to decrease and, conversely, interest rate reductions may cause the value of fixed-income securities to increase. During periods of extremely low or negative short-term interest rates, the portfolio may not be able to maintain a positive yield or total return or be able to preserve the value of your investment at $1.00 per share.

**U.S. Government Securities** – U.S. government securities are subject to market risk, interest rate risk and credit risk. Securities backed by the Treasury or the full faith and credit of the U.S. government are guaranteed only as to the timely payment of interest and principal when held to maturity. Accordingly, the current market values for these securities will fluctuate with changes in interest rates and the financial condition or credit rating of the U.S. government. Notwithstanding that these securities are backed by the full faith and credit of the U.S. government, circumstances could arise that would prevent the payment of interest or principal. Securities issued by U.S. government-sponsored entities and federal agencies and instrumentalities that are not backed by the full faith and credit of the U.S. government are not funded by congressional appropriations and the securities issued by them are neither issued nor guaranteed by the U.S. government.

**Fixed-Income Securities** – Risks of fixed-income securities include credit risk, interest rate risk, counterparty risk, prepayment risk, extension risk, valuation risk, and liquidity risk. The value of fixed-income securities may go up or down, sometimes rapidly and unpredictably, due to general market conditions, such as real or perceived adverse economic or political conditions, tariffs and

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trade disruptions, wars, social unrest, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. In addition, the value of a fixed-income security may decline if the issuer or other obligor of the security fails to pay principal and/or interest, otherwise defaults or has its credit rating downgraded or is perceived to be less creditworthy, or the credit quality or value of any underlying assets declines. If the value of fixed-income securities owned by the portfolio falls, the value of your investment will go down. The portfolio may lose its entire investment in the fixed-income securities of an issuer.

**Credit –** An issuer or other obligor (such as a party providing insurance or other credit enhancement) of a security held by the portfolio or a counterparty to a financial contract with the portfolio may be unable or unwilling to meet its financial obligations or may be perceived (whether by market participants, ratings agencies, pricing services or otherwise) to be less creditworthy, or the value of assets underlying a security may decline. A decline may be rapid and/or significant, particularly in certain market environments. In addition, the portfolio may incur costs and may be hindered or delayed in enforcing its rights against an issuer, obligor or counterparty.

**Counterparty** – The portfolio could lose money if the counterparties to derivatives, repurchase agreements and/or other financial contracts entered into for the portfolio do not fulfill their contractual obligations. In addition, the portfolio may incur costs and may be hindered or delayed in enforcing its rights against a counterparty. These risks may be greater to the extent the portfolio has more contractual exposure to a counterparty.

**Repurchase Agreements –** In a repurchase agreement, the portfolio purchases securities from a broker-dealer or a bank, called the counterparty, upon the agreement of the counterparty to repurchase the securities from the portfolio at a later date, and at a specified price. The securities purchased serve as the portfolio's collateral for the obligation of the counterparty to repurchase the securities. If the counterparty does not repurchase the securities, the portfolio is entitled to sell the securities, but the portfolio may not be able to sell them for the price at which they were purchased, thus causing a loss. If the counterparty becomes insolvent, there is some risk that the portfolio will not have a right to the securities, or the immediate right to sell the securities.

**Extension** – When interest rates rise, payments of fixed-income securities, including asset- and mortgage-backed securities, may occur more slowly than anticipated, causing their market prices to decline.

**Management** – The portfolio is subject to the risk that the investment manager's or sub-adviser's judgments and decisions may be incorrect or otherwise may not produce the desired results. The sub-adviser's judgment about the quality, relative yield or value of, or market trends affecting, a particular security or issuer, industry or sector, or about the economy or interest rates, may be incorrect. The portfolio is also subject to the risk of imperfections, errors or limitations in the quantitative, analytic or other tools, resources, information and data used, or the analyses employed or relied on, by the sub-adviser, if such tools, resources, information or data are used incorrectly, fail to produce the desired results or otherwise do not work as intended, or if the sub-adviser's investment style fails to produce the desired results. Any of these things could cause the portfolio to lag relevant benchmarks or other funds with similar objectives.

**Active Trading** – The portfolio may engage in active trading of its portfolio. Active trading will increase transaction costs and could detract from performance. Active trading may be more pronounced during periods of market volatility.

**Cybersecurity** – Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain access to portfolio assets, portfolio or shareholder data (including private shareholder information), or proprietary information, cause the portfolio or its service providers (including, but not limited to, the portfolio's investment manager, any sub-adviser(s), transfer agent, distributor, custodian, fund accounting agent and financial intermediaries) to suffer data breaches, data corruption or loss of operational functionality, or prevent portfolio investors from purchasing, redeeming or exchanging shares, receiving distributions or receiving timely information regarding the portfolio or their investment in the portfolio. Cybersecurity incidents may render records of portfolio assets and transactions, shareholder ownership of portfolio shares, and other data integral to the functioning of the portfolio inaccessible, inaccurate or incomplete. The use of artificial intelligence and machine learning could exacerbate these risks. Cybersecurity incidents may result in financial losses to the portfolio and its shareholders, and substantial costs may be incurred in order to prevent or mitigate any future cybersecurity incidents.

**Large Shareholder –** A significant portion of the portfolio's shares may be owned by one or more investment vehicles or institutional investors. Transactions by these large shareholders may be disruptive to the management of the portfolio. For example, the portfolio may experience large redemptions and could be required to sell securities at a time when it may not otherwise desire to do so. Such transactions may increase the portfolio's brokerage and/or other transaction costs. In addition, sizeable redemptions could cause the portfolio's total expenses to increase.

**Liquidity** – The portfolio may make investments that are illiquid or that become illiquid after purchase. Illiquid investments can be difficult to value, may trade at a discount from comparable, more liquid investments, and may be subject to wide fluctuations in value. Liquidity risk may be magnified in rising interest rate or volatile environments. If the portfolio is forced to sell an illiquid investment to meet redemption requests or other cash needs, the portfolio may be forced to sell at a substantial loss or may not be able to sell at all. Liquidity of particular investments, or even entire asset classes, including U.S. Treasury securities, can deteriorate rapidly, particularly during times of market turmoil, and those investments may be difficult or impossible for the portfolio to sell. This may prevent the portfolio from limiting losses.

**Redemption –** The portfolio may experience periods of heavy redemptions that could cause the portfolio to liquidate its assets at inopportune times or at a loss or depressed value. Redemption risk is greater to the extent that the portfolio has investors with large shareholdings, short investment horizons, or unpredictable cash flow needs. The redemption by one or more large shareholders of their holdings in the portfolio could have an adverse impact on the remaining shareholders in the portfolio. In addition, the portfolio may suspend redemptions when permitted by applicable regulations.

**Underlying Government Money Market Funds –** The portfolio may invest in other government money market funds. Each of the underlying government money market funds in which

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the portfolio may invest has its own investment risks. There can be no assurance that the investment objective of any underlying government money market fund will be achieved. In addition, the portfolio will bear a pro rata portion of the operating expenses of the underlying government money market funds in which it invests.

**Yield –** The amount of income received by the portfolio will go up or down depending on day-to-day variations in short-term interest rates, and the portfolio's expenses could absorb all or a significant portion of the portfolio's income. If interest rates increase, the portfolio's yield may not increase proportionately.

**Performance:** The bar chart and the table below provide some indication of the risks of investing in the portfolio. The bar chart shows how the portfolio's performance has varied from year to year. The table shows the portfolio's average annual total returns for different periods.

The performance calculations do not reflect any charges that are, or may be, imposed under your variable life insurance policy or variable annuity contract. If such charges were reflected, performance would be lower.

Absent any applicable fee waivers and/or expense limitations, performance would be lower.

As with all mutual funds, past performance is not a prediction of future results. Updated performance information is available on our website at www.transamerica.com/annuities-performance-center or by calling 1-800-851-9777.

Prior to May 1, 2016, the portfolio operated as a "prime" money market portfolio and invested in certain types of securities that the portfolio is no longer permitted to hold. Consequently, the performance information below might have been different if the current investment limitations had been in effect prior to the conversion to a government money market portfolio. Performance shown for periods prior to May 1, 2016 reflects the portfolio's former investment strategy.

Prior to November 1, 2018, the portfolio was named Transamerica Aegon Government Money Market VP, had a different sub-adviser, and used different investment strategies. The performance set forth prior to that date is attributable to the previous sub-adviser and the investment strategies then in effect.

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**Annual Total Returns (calendar years ended December 31) - Initial Class**

![](g29247brgmmvp.jpg)

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| | | |
|:---|:---|:---|
|  | **Quarter Ended** | **Return** |
| Best Quarter: | 12/31/2023 | 1.31% |
| Worst Quarter: | 3/31/2017 | 0.00% |

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**7-DAY YIELD (as of December 31, 2025)**

**Initial Class = 3.43%**

**Service Class = 3.17%**

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**Average Annual Total Returns (periods ended December 31, 2025)** 

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| | | | | |
|:---|:---|:---|:---|:---|
|  | **1 Year** | **5 Years** | **10 Years** | **Inception**<br> **Date**<br>|
| Initial Class  | 4.07% | 3.05% | 1.91% | 10/2/1986 |
| Service Class  | 3.81% | 2.91% | 1.72% | &nbsp;&nbsp; 5/1/2003 |

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**Management:** 

*Investment Manager:* Transamerica Asset Management, Inc.<br> *Sub-Adviser:* BlackRock Investment Management, LLC<br>

**Purchase and Sale of Portfolio Shares:** Shares of the portfolio may only be purchased or redeemed through variable life insurance policies and variable annuity contracts offered by the separate accounts of participating life insurance companies. Please refer to the corresponding prospectus of the policy or annuity contract that you have chosen for more information about the terms of the offering. Shares of the portfolio may also be sold to the asset allocation portfolios and to other funds of funds.

The portfolio does not have any initial or subsequent investment minimums. However, your insurance company may impose investment minimums.

The portfolio will not be charged and does not intend to pay any 12b-1 fees on Initial Class shares through May 1, 2027. The maximum 12b-1 fee on Initial Class shares is 0.15%. The portfolio reserves the right to pay such fees after that date.

**Tax Information:** Distributions made by the portfolio to an insurance company separate account, and exchanges and redemptions of portfolio shares made by the separate account, ordinarily do not cause the owners of insurance policies and annuity contracts invested in the separate account to recognize income or gain for federal income tax purposes. Please refer to the corresponding prospectus of the policy or annuity contract that you have chosen for more information regarding the tax consequences of your investment.

**Payments to Broker-Dealers and Other Financial Intermediaries:** The portfolio is generally only available as an underlying investment option for separate accounts of Transamerica life insurance companies to fund benefits under variable life insurance policies and variable annuity contracts. The portfolio and/or its affiliates may make payments to a Transamerica insurance company (or its affiliates) and to broker-dealers and other financial intermediaries for the sale of variable contracts (and thus, indirectly, the portfolio's shares) and related services. These payments may create a conflict of interest by influencing the Transamerica insurance company or other intermediary to recommend the variable contracts that invest in the portfolio. Ask your salesperson or visit your financial intermediary's website for more information.

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SPST0526BRGMM

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