Transamerica High Yield Bond

Summary Prospectus March 1, 2021, as revised April 1, 2021

Class I2 Ticker Symbol: None

Thank you for being a valued Transamerica shareholder. This Summary Prospectus will provide you with updated information about your investment in the fund.

Before you invest, you may want to review the fund’s prospectus, which contains more information about the fund and its risks. You can find the fund’s prospectus and other information about the fund, including the fund’s statement of additional information and most recent reports to shareholders, online at www.transamerica.com. 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 fund’s prospectus dated March 1, 2021, and statement of additional information, dated March 1, 2021, as supplemented from time to time, and the independent registered public accounting firm’s report and financial statements in the fund’s annual report to shareholders, dated October 31, 2020, are incorporated by reference into this summary prospectus.

Investment Objective: Seeks a high level of current income by investing in high-yield debt securities.

Fees and Expenses:

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Shareholder Fees (fees paid directly from your investment)

Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None
Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is lower)	None

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

Management fees1	0.55%
Distribution and service (12b-1) fees	None
Other expenses	0.05%
Total annual fund operating expenses	0.60%

Management fees have been restated to reflect a reduction in management fees effective January 6, 2020.

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

The Example assumes that you invest $10,000 in the fund 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 fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

	1 year	3 years	5 years	10 years
Class I2	$61	$192	$335	$750

Portfolio Turnover: The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares

are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the fund’s performance.

During the most recent fiscal year, the portfolio turnover rate for the fund was 37% of the average value of its portfolio.

Principal Investment Strategies: The fund's sub-adviser, Aegon USA Investment Management, LLC (the “sub-adviser”), seeks to achieve the fund's objective by investing, under normal circumstances, at least 80% of the fund's net assets (plus the amount of borrowings, if any, for investment purposes) in high-yield bonds (commonly known as “junk bonds”). The fund normally invests primarily in U.S. securities.

Junk bonds are high-risk debt securities rated below investment grade (that is, securities rated below BBB by Standard & Poor’s or Fitch or below Baa by Moody’s or, if unrated, determined to be of comparable quality by the sub-adviser). The sub-adviser seeks to achieve high returns for the fund while maintaining a reasonable risk profile.

The sub-adviser uses a combination of a global “top-down” analysis of the macroeconomic and interest rate environment and proprietary “bottom-up” research of corporate and sovereign debt, stressed and distressed securities, and other debt instruments. In the sub-adviser’s “top-down” approach, the sub-adviser analyzes various fundamental, technical, sentiment, and valuation factors that the sub-adviser believes affect the movement of markets and securities prices worldwide. This “top-down” analysis assists the sub-adviser in analyzing fund risk and allocating assets among sectors, industries, and credit quality categories. In its proprietary “bottom-up” research, the sub-adviser considers various fundamental and other factors, such as creditworthiness and capital structure. The sub-adviser’s research analysts integrate environmental, social and governance matters within their analytical process alongside traditional credit analysis.

The fund has no maturity or duration requirements or limitations. The fund may invest in foreign securities, including up to 10% of its net assets in emerging market securities.

To a lesser extent, the fund may invest in investment grade bonds, bank loans, asset backed and mortgage backed securities, preferred equity securities, common equity securities (received in connection

with exchanges or restructurings) and cash equivalents. The fund may also invest in hybrid instruments having both debt and equity characteristics.

Principal Risks: Risk is inherent in all investing. Many factors and risks affect the fund's performance, including those described below. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly day to day and over time. You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments. The following is a summary description of principal risks (in alphabetical order after certain key risks) of investing in the fund. An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You may lose money if you invest in this fund.

Market – The market values of the fund’s securities and other assets will fluctuate, sometimes sharply and unpredictably, due to changes in general market conditions, overall economic trends or events, governmental actions or interventions, actions taken by the U.S. Federal Reserve or foreign central banks, political developments, investor sentiment, public health emergencies such as a pandemic, and other factors that may or may not be related to the issuer of the security or other asset. The market prices of securities and other assets also may go down due to events or conditions that affect particular sectors, industries or issuers. Adverse market conditions may be prolonged and may not have the same impact on all types of securities or other assets.

Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading and tariff arrangements, public health events, terrorism, technology and data interruptions, natural disasters, and other 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 fund invests in securities of issuers located in or with significant exposure to the countries directly affected, the value and liquidity of the fund’s investments may go down.

The COVID-19 pandemic has caused substantial market disruption around the world, including the U.S. There have been periods of extreme volatility, and periods where there have been no buyers for certain securities, including U.S. Treasury securities. Some sectors of the economy and individual issuers have experienced particularly large losses. The pandemic has reduced liquidity of particular investments and asset classes; resulted in significant disruptions to business operations, including business closures; strained healthcare systems; disrupted supply chains, consumer demand and employee availability; and restricted travel. These conditions may continue for an extended period of time, or worsen. The pandemic may result in a sustained domestic or global economic downturn or recession. Developing or emerging market countries may be more adversely impacted. The ultimate economic fallout from the pandemic, and the long-term impact on economies, markets, industries and individual issuers, are not known.

The U.S. government and the Federal Reserve, as well as certain foreign governments and central banks, have taken extraordinary actions to support local and global economies and the financial markets in response to the COVID-19 pandemic. These

actions have resulted in significant expansion of public debt, including in the U.S. The long-term consequences of this level of public debt are not known. In addition, certain interest rates have been reduced to very low levels. This and other government intervention into the economy and financial markets to address the pandemic may not work as intended, particularly if the efforts are perceived by investors as being unlikely to achieve the desired results.

The COVID-19 pandemic could continue to adversely affect the value and liquidity of the fund’s investments, impair the fund’s ability to satisfy redemption requests, and negatively impact the fund’s performance.

High-Yield Debt Securities – High-yield debt securities, commonly referred to as “junk” bonds, are securities that are rated below “investment grade” or are of comparable quality. Changes in interest rates, the market’s perception of the issuers, the creditworthiness of the issuers and negative perceptions of the junk bond market generally may significantly affect the value of these bonds. Junk bonds are considered speculative, tend to be volatile, typically have a higher risk of default, tend to be less liquid and more difficult to value than higher grade securities, and may result in losses for the fund.

Credit – If an issuer or other obligor (such as a party providing insurance or other credit enhancement) of a security held by the fund or a counterparty to a financial contract with the fund is unable or unwilling to meet its financial obligations, or is downgraded or perceived to be less creditworthy (whether by market participants or otherwise), or if the value of any underlying assets declines, the value of your investment will typically decline. A decline may be significant, particularly in certain market environments. In addition, the fund may incur costs and may be hindered or delayed in enforcing its rights against an issuer, obligor or counterparty.

Interest Rate – Interest rates in the U.S. and certain foreign markets have been low relative to historic levels. The fund faces a risk that interest rates may rise. The value of fixed income securities generally goes down when interest rates rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. Changes in interest rates also may affect the liquidity of the fund’s investments. 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 generally and could also result in increased redemptions from the fund. Increased redemptions could cause the fund to sell securities at inopportune times or depressed prices and result in further losses.

Fixed-Income Securities – Fixed-income securities are subject to risks including 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 trade disruptions, 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 fund falls, the value of your investment will go down. The fund may lose its entire investment in the fixed-income securities of an issuer.

Liquidity – The fund 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. If the fund is forced to sell an illiquid investment to meet redemption requests or other cash needs, the fund 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 fund to sell. This may prevent the fund from limiting losses.

Distressed or Defaulted Securities – Investments in defaulted securities and obligations of distressed issuers, including securities that are, or may be, involved in reorganizations or other financial restructurings, either out of court or in bankruptcy, involve substantial risks in addition to the risks of investing in high-yield debt securities. These securities are considered speculative. The fund may incur costs to protect its investment, and the fund could lose its entire investment.

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

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

Prepayment or Call – Many issuers have a right to prepay their fixed income securities. If this happens, the fund will not benefit from the rise in the market price of the securities that normally accompanies a decline in interest rates and may be forced to reinvest the prepayment proceeds in securities with lower yields.

Focused Investing – To the extent the fund invests in a limited number of countries, regions, sectors, industries or market segments, in a limited number of issuers, or in issuers in related businesses or that are subject to related operating risks, the fund will be more susceptible to negative events affecting those countries, regions, sectors, industries, segments or issuers, and the value of its shares may be more volatile than if it invested more widely.

Valuation – The sales price the fund could receive for any particular portfolio investment may differ from the fund's valuation of the investment, particularly for securities that trade in thin or volatile markets, that are priced based upon valuations provided by third-party pricing services that use matrix or evaluated pricing systems, or that are valued using a fair value methodology. These differences may increase significantly and affect fund investments more broadly during periods of market volatility. Investors who purchase or redeem fund shares on days when the fund is holding fair-valued securities may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the fund had not fair-valued securities or had used a different valuation methodology.

Management – The value of your investment may go down if the investment manager’s or sub-adviser's judgments and decisions are incorrect or otherwise do not produce the desired results, or if the fund’s investment strategy does not work as intended. You may also suffer losses if there are imperfections, errors or limitations in the quantitative, analytic or other tools, resources, information and data used, investment techniques applied, or the analyses employed or relied on, by the investment manager or sub-adviser, if such tools, resources, information or data are used incorrectly or otherwise do not work as intended, or if the investment manager’s or sub-adviser's investment style is out of favor or otherwise fails to produce the desired results. Any of these things could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives.

Active Trading – The fund may purchase and sell securities without regard to the length of time held. Active trading may be more pronounced during periods of market volatility, may have a negative impact on performance by increasing transaction costs and may generate greater amounts of short-term capital gains.

Bank Obligations – Banks are sensitive to changes in money market and general economic conditions. Banks are highly regulated. Decisions by regulators may limit the loans banks make and the interest rates and fees they charge, and may reduce bank profitability.

Currency – The value of a fund’s investments in securities denominated in foreign currencies increases or decreases as the rates of exchange between those currencies and the U.S. dollar change. U.S. dollar-denominated securities of foreign issuers may also be affected by currency risk. Currency exchange rates can be volatile and may fluctuate significantly over short periods of time. Currency conversion costs and currency fluctuations could reduce or eliminate investment gains or add to investment losses. A fund may be unable or may choose not to hedge its foreign currency exposure.

Emerging Markets – Investments in securities of issuers located or doing business in emerging markets are subject to heightened foreign investments risks and may experience rapid and extreme changes in value. Emerging market countries tend to have less developed and less stable economic, political and legal systems and regulatory and accounting standards, may have policies that restrict investment by foreigners or that prevent foreign investors such as the fund from withdrawing their money at will, and are more likely to experience nationalization, expropriation and confiscatory taxation. In addition, emerging market securities may have low trading volumes and may be or become illiquid.

Energy Sector – Industries in the energy segment, such as those engaged in the development, production and distribution of energy resources, can be significantly affected by supply and demand both for their specific product or service and for energy products in general. The price of oil, gas and other consumable fuels, exploration and production spending, government regulation, world events and economic conditions likewise will affect the performance of companies in these industries.

Equity Securities – Equity securities generally have greater risk of loss than debt securities. Stock markets are volatile and the value of equity securities may go up or down sometimes rapidly and unpredictably. The value of equity securities fluctuates based on real or perceived changes in a company’s financial condition,

factors affecting a particular industry or industries, and overall market, economic and political conditions. If the market prices of the equity securities owned by the fund fall, the value of your investment in the fund will decline. The fund may lose its entire investment in the equity securities of an issuer.

Floating Rate Loans – Floating rate loans are often made to borrowers whose financial condition is troubled or highly leveraged. These loans frequently are rated below investment grade and are therefore subject to “High-Yield Debt Securities” risk. There is no public market for floating rate loans and the loans may trade infrequently and be subject to wide bid/ask spreads. Many floating rate loans are subject to restrictions on resale. Floating rate loans may have trade settlement periods in excess of seven days, which may result in the fund not receiving proceeds from the sale of a loan for an extended period. As a result, the fund may be subject to greater “Liquidity” risk than a fund that does not invest in floating rate loans and the fund may be constrained in its ability to meet its obligations (including obligations to redeeming shareholders). The lack of an active trading market may also make it more difficult to value floating rate loans. Rising interest rates can lead to increased default rates as payment obligations increase.

Foreign Investments – Investing in securities of foreign issuers or issuers with significant exposure to foreign markets involves additional risks. Foreign markets can be less liquid, less regulated, less transparent and more volatile than U.S. markets. The value of the fund’s foreign investments may decline, sometimes rapidly or unpredictably, because of factors affecting the particular issuer as well as foreign markets and issuers generally, such as unfavorable or unsuccessful government actions, reduction of government or central bank support, tariffs and trade disruptions, political or financial instability, social unrest or other adverse economic or political developments. Foreign investments may be more difficult to value than investments in U.S. issuers.

Hybrid Instruments – Investing in hybrid instruments involves a combination of risks, including risks of investing in securities, commodities, options, futures, and currencies. An investment in a hybrid instrument may entail significant risks in addition to those associated with traditional fixed-income or convertible securities.

Large Shareholder – A significant portion of the fund’s shares may be owned by other funds sponsored by Transamerica. Transactions by these funds may be disruptive to the management of the fund. For example, the fund 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 fund’s brokerage and/or other transaction costs. In addition, sizeable redemptions could cause the fund’s total expenses to increase.

Loans – Loans are subject to the credit risk of nonpayment of principal or interest. Economic downturns or increases in interest rates may cause an increase in defaults, interest rate risk and liquidity risk. Loans may or may not be collateralized at the time of acquisition, and any collateral may be relatively illiquid or lose all or substantially all of its value subsequent to investment. The fund's investments in loans are also subject to prepayment or call risk.

Preferred Stock – Preferred stock’s right to dividends and liquidation proceeds is junior to the rights of a company’s debt securities. The value of preferred stock may be subject to factors that affect fixed income and equity securities. The value of preferred

stock tends to vary more with fluctuations in the underlying common stock and less with fluctuations in interest rates and tends to exhibit greater volatility.

Privately Placed and Other Restricted Securities – Restricted securities, which include private placements of private and public companies, are subject to legal or contractual restrictions on their resale. Restricted securities may be difficult to sell at the time and price a fund prefers. Restricted securities may be difficult to value properly and may involve greater risks than securities that are not subject to restrictions on resale, both of which may result in substantial losses. An insufficient number of eligible buyers interested in purchasing restricted securities held by a fund could adversely affect the marketability of such securities and a fund might be unable to dispose of such securities promptly or at reasonable prices, adversely affecting a fund’s overall liquidity. Restricted securities may not be listed on an exchange and may have no active trading market. A fund may incur additional expense when disposing of restricted securities.

Sustainability and Environmental, Social and Governance (“ESG”) Considerations - Applying sustainability and/or ESG factors as part of the fund’s security selection process may impact the sub-adviser’s investment decisions. Sustainability and ESG factors are not uniformly defined and applying such factors involves subjective assessments. Sustainability and ESG ratings and assessments of issuers can vary across third party data providers and may change over time. Sustainability and ESG factors can be difficult to apply consistently across issuers, regions, countries, industries or sectors. The application of these factors could negatively impact the fund’s performance.

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

Performance: The bar chart and the table below provide some indication of the risks of investing in the fund. The bar chart shows how the fund’s performance has varied from year to year. The table shows how the fund’s average annual total returns for different periods compare to the returns of a broad measure of market performance.

As with all mutual funds, past performance (before and after taxes) is not a prediction of future results. Updated performance information is available on our website at www.transamerica.com/individual/products/mutual-funds/performance/ or by calling 1-888-233-4339.

Annual Total Returns (calendar years ended December 31) - Class I2

	Quarter Ended	Return
Best Quarter:	6/30/2020	9.16%
Worst Quarter:	3/31/2020	-15.02%

Average Annual Total Returns (periods ended December 31, 2020)

	1 Year	5 Years	10 Years	Inception Date
Class I2				11/8/2004
Return before taxes	4.15%	7.35%	6.36%
Return after taxes on distributions	1.89%	4.84%	3.77%
Return after taxes on distributions and sale of fund shares	2.34%	4.54%	3.78%
Bloomberg Barclays US Corporate High Yield 2% Issuer Capped Index (reflects no deduction for fees, expenses or taxes)	7.05%	8.57%	6.79%

The after-tax returns are calculated using the historic highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns may depend on the investor’s individual tax situation and may differ from those shown. After-tax returns may not be relevant if the investment is made through a tax-exempt or tax-deferred account, such as a 401(k) plan.

Management:

Investment Manager: Transamerica Asset Management, Inc. Sub-Adviser: Aegon USA Investment Management, LLC Portfolio Managers:
Kevin Bakker, CFA	Portfolio Manager	since 2007
Benjamin D. Miller, CFA	Portfolio Manager	since 2006
James K. Schaeffer, Jr.	Portfolio Manager	since 2011

Purchase and Sale of Fund Shares: Class I2 shares of the fund are currently primarily offered for investment by certain funds of funds (also referred to as “strategic asset allocation funds”). Class I2 shares of the fund are also made available to other investors, including institutional investors such as foreign insurers, domestic insurance companies and their separate accounts, and unaffiliated funds, high net worth individuals, and eligible retirement plans whose recordkeepers or financial service firm intermediaries have entered into agreements with Transamerica Funds or its agents. Investors who received Class I2 shares in connection with the reorganization of a Transamerica Premier Fund into a Transamerica

Fund may continue to invest in Class I2 shares of that Transamerica Fund, but may not open new accounts. You buy and redeem shares at the fund’s next-determined net asset value (“NAV”) after receipt of your request in good order. There is no investment minimum for investments in Class I2 shares of the fund.

Tax Information: Fund distributions may be taxable as ordinary income, qualified dividend income, or capital gains, except when your investment is in an IRA, 401(k) or other tax-advantaged investment plan. In that case, you may be taxed when you take a distribution from such plan, depending on the type of plan, the circumstances of your distribution and other factors.

Payments to Broker-Dealers and Other Financial Intermediaries: If you purchase the fund through a broker-dealer or other financial intermediary, the fund and/or its affiliates may pay the intermediary for the sale of fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the fund over another investment. Ask your salesperson or visit your financial intermediary’s website for more information.

In an effort to reduce paper mailings and conserve natural resources, we encourage you to visit our website, www.transamerica.com, to set up an account and enroll in eDelivery.

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