MASSMUTUAL FUNDS

This Prospectus describes the following Funds:

Fund Name			Class I
MM Equity Asset Fund			MSEJX
MassMutual Select T. Rowe Price Bond Asset Fund			MMBEX
MassMutual Select T. Rowe Price Emerging Markets Bond Fund			MMEMX
MassMutual Select T. Rowe Price Large Cap Blend Fund			MMLRX
MassMutual Select T. Rowe Price Limited Duration Inflation Focused Bond Fund			MMLDX
MassMutual Select T. Rowe Price Real Assets Fund			MMRFX
MassMutual Select T. Rowe Price Small and Mid Cap Blend Fund			MMBUX
MassMutual Select T. Rowe Price U.S. Treasury Long-Term Index Fund			MMUTX

The Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any statement to the contrary is a crime.

PROSPECTUS

February 1, 2024

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Table Of Contents

	Page
About the Funds
MM Equity Asset Fund		3
MassMutual Select T. Rowe Price Bond Asset Fund		7
MassMutual Select T. Rowe Price Emerging Markets Bond Fund		15
MassMutual Select T. Rowe Price Large Cap Blend Fund		21
MassMutual Select T. Rowe Price Limited Duration Inflation Focused Bond Fund		27
MassMutual Select T. Rowe Price Real Assets Fund		33
MassMutual Select T. Rowe Price Small and Mid Cap Blend Fund		39
MassMutual Select T. Rowe Price U.S. Treasury Long-Term Index Fund		45
Additional Information Regarding Investment Objectives and Principal Investment Strategies		50
Disclosure of Portfolio Holdings		52
Additional Information Regarding Principal Risks		52
Management of the Funds
Investment Adviser		72
Subadvisers and Portfolio Managers		72
About the Class of Shares – I Shares		76
Buying, Redeeming, and Exchanging Shares		76
Frequent Trading Policies		79
Determining Net Asset Value		80
Taxation and Distributions		81
Financial Highlights		84
Index Descriptions		92

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MM Equity Asset Fund

INVESTMENT OBJECTIVE

The Fund seeks to provide a consistently high total return from a broadly diversified portfolio of equity securities with risk characteristics similar to the Standard and Poor’s 500 Composite Stock Price Index (S&P 500® Index*).

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund.

Shareholder Fees (fees paid directly from your investment)

			Class I
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)			None
Maximum Deferred Sales Charge (Load) (as a % of the lower of the original offering price or redemption proceeds)			None

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

			Class I
Management Fees			0.18%
Distribution and Service (Rule 12b-1) Fees			None
Other Expenses			0.10%
Total Annual Fund Operating Expenses			0.28%

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. It assumes that you invest $10,000 in each share class of the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment earns a 5% return each year and that the Fund’s operating expenses are exactly as described in the preceding table. 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 I			$29			$90			$157			$356

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 Fund’s portfolio turnover rate was 27% of the average value of its portfolio.

INVESTMENTS, RISKS, AND PERFORMANCE

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities. Equity securities may include common stocks, preferred stocks, securities convertible into common or preferred stocks, rights, and warrants. The Fund typically invests most of its assets in the common stocks of U.S. companies in the S&P 500 Index (the “Index”). The Fund may also invest in securities not included within the Index. As of December 31, 2023, the market capitalization range of companies included in the Index was $6.50 billion to $2.99 trillion. Sector by sector, the Fund’s weightings are similar to those of the Index. Within each sector, the Fund’s subadviser, J.P. Morgan Investment Management Inc. (“J.P. Morgan”), modestly overweights equity securities that it considers undervalued or fairly valued while modestly underweighting or not holding equity securities that appear overvalued. By owning a large number of equity securities within the Index, with an emphasis on those that appear undervalued or fairly valued, the Fund seeks returns that modestly exceed those of the Index over the long term with a modest level of volatility as compared to the Index.

The Fund may use derivatives as substitutes for securities in which the Fund can invest. To the extent the Fund uses derivatives, the Fund will primarily use futures contracts to more effectively gain targeted equity exposure from its cash

The “S&P 500 Index” is a product of S&P Dow Jones Indices LLC or its affiliates (“SPDJI”), and has been licensed for use by MassMutual. S&P®, S&P 500®, US 500, The 500, iBoxx®, iTraxx® and CDX® are trademarks of S&P Global, Inc. or its affiliates (“S&P”); Dow Jones® is a registered trademark of Dow Jones Trademark Holdings LLC (“Dow Jones”); and these trademarks have been licensed for use by SPDJI and sublicensed for certain purposes by MassMutual. The Fund is not sponsored, endorsed, sold or promoted by SPDJI, Dow Jones, S&P, or their respective affiliates, and none of such parties make any representation regarding the advisability of investing in such product(s) nor do they have any liability for any errors, omissions, or interruptions of the S&P 500 Index.

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positions. Use of derivatives by the Fund may create investment leverage.

In managing the investments of the Fund, J.P. Morgan employs a three-step process that combines research, valuation, and stock selection. J.P. Morgan takes an in-depth look at company prospects over a period as long as five years, which is designed to provide insight into a company’s real growth potential. The research findings allow J.P. Morgan to rank the companies in each sector group according to their relative values. As a part of its investment process, J.P. Morgan seeks to assess the impact of environmental, social, and governance factors (including accounting and tax policies, disclosure and investor communication, shareholder rights, and remuneration policies) on the cash flows of many companies in which it may invest to identify issuers that J.P. Morgan believes will be negatively impacted by such factors relative to other issuers. These determinations may not be conclusive and securities of such issuers may be purchased and retained by the Fund.

J.P. Morgan buys and sells equity securities, using the research and valuation rankings as a basis. Along with attractive valuation, J.P. Morgan often considers a number of other criteria:

•

catalysts that could trigger a rise in a stock’s price;

•

impact on the overall risk of the portfolio relative to the Index;

•

high perceived potential reward compared to perceived potential risk; and

•

possible temporary mispricings caused by apparent market overreactions.

J.P. Morgan may sell a security as its valuation or ranking changes or if more attractive investments become available.

Principal Risks

The following are the Principal Risks of the Fund. The value of your investment in the Fund could go down as well as up. You can lose money by investing in the Fund. Certain risks relating to instruments and strategies used in the management of the Fund are placed first. The significance of any specific risk to an investment in the Fund will vary over time, depending on the composition of the Fund’s portfolio, market conditions, and other factors. You should read all of the risk information presented below carefully, because any one or more of these risks may result in losses to the Fund.

Equity Securities Risk Although stocks may have the potential to outperform other asset classes

over the long term, their prices tend to fluctuate more dramatically over the shorter term. These movements may result from factors affecting individual companies, or from broader influences like changes in interest rates, market conditions, or investor confidence, or announcements of economic, political, or financial information.

Derivatives Risk Derivatives can be highly volatile and involve risks different from, and potentially greater than, direct investments, including risks of imperfect correlation between the value of derivatives and underlying assets, counterparty default, potential losses that partially or completely offset gains, and illiquidity. Derivatives can create investment leverage. Losses from derivatives can be substantially greater than the derivatives’ original cost and can sometimes be unlimited. If the value of a derivative does not correlate well with the particular market or asset class the derivative is designed to provide exposure to, the derivative may not have the effect or benefit anticipated. Derivatives can also reduce the opportunity for gains or result in losses by offsetting positive returns in other investments. Many derivatives are traded in the over-the-counter market and not on exchanges.

Growth Company Risk The prices of growth securities are often highly sensitive to market fluctuations because of their heavy dependence on future earnings or cash flow expectations, and can be more volatile than the market in general.

Indexing Risk The Fund’s performance may not track the performance of the index due to a number of factors, including fees and expenses of the Fund, the Fund’s cash positions, and differences between securities held by the Fund and the securities comprising the index which may result from legal restrictions, costs, or liquidity constraints, especially during times when a sampling methodology is used.

Large Company Risk Large-capitalization stocks as a group could fall out of favor with the market, causing the Fund’s investments in large-capitalization stocks to underperform investments that focus on small- or medium-capitalization stocks. Larger, more established companies may be slow to respond to challenges and may grow more slowly than smaller companies.

Small and Mid-Cap Company Risk Market risk and liquidity risk are particularly pronounced for securities of small and medium-sized companies, which may trade less frequently and in smaller

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volumes than more widely-held securities, and may fluctuate in price more than other securities. Their shares can be less liquid than those of larger companies, especially during market declines. Small and medium-sized companies may have limited product lines, markets, or financial resources and may be dependent on a limited management group; they may have been recently organized and have little or no track record of success.

Value Company Risk The value investment approach entails the risk that the market will not recognize a security’s intrinsic value for a long time, or that a stock the investment adviser or subadviser judges to be undervalued may actually be appropriately priced.

Cash Position Risk If the Fund holds a significant portion of its assets in cash or cash equivalents, its investment returns may be adversely affected and the Fund may not achieve its investment objective.

Liquidity Risk Certain securities may be difficult (or impossible) to sell or certain positions may be difficult to close out at a desirable time and price, and the Fund may be required to hold an illiquid investment that is declining in value, or it may be required to sell certain illiquid investments at a price or time that is not advantageous in order to meet redemptions or other cash needs. Some securities may be subject to restrictions on resale. There can be no assurance that there will be a liquid market for instruments held by the Fund at any time. The Fund may not receive the proceeds from the sale of certain investments for an extended period.

Management and Operational Risk The Fund relies on the manager’s investment analysis and its selection of investments to achieve its investment objective, and the Fund is subject to the risk that the manager’s assessment of an investment is wrong. There can be no assurance that the Fund will achieve the intended results and the Fund may incur significant losses. The Fund also runs the risk that deficiencies in the investment adviser’s, subadviser’s, or another service provider’s internal systems or controls will cause losses for the Fund or impair Fund operations.

economic, industry, political, regulatory, geopolitical, public health, and other conditions, as well as investor perceptions of these conditions. The Fund is subject to risks affecting issuers, such as management performance, financial leverage, industry problems, and reduced demand for goods or services.

Sector Risk The Fund may allocate more of its assets to particular industries or to particular economic, market, or industry sectors than to others. This could increase the volatility of the Fund’s portfolio, and the Fund’s performance may be more susceptible to developments affecting issuers in those industries or sectors than if the Fund invested more broadly.

Valuation Risk The Fund is subject to the risk of mispricing or improper valuation of its investments, in particular to the extent that its securities are fair valued.

Performance Information

Annual Performance

Class I Shares

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Highest
Quarter:

2Q ’20,

21.97%

Lowest
Quarter:

1Q ’20,

–19.51%

After-tax returns are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts.

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Average Annual Total Returns

(for the periods ended December 31, 2023)

		One Year			Five Years			Since Inception (09/15/16)
Class I	Return Before Taxes		28.23	%		16.81	%		13.20	%
	Return After Taxes on Distributions		24.42	%		13.18	%		8.97	%
	Return After Taxes on Distributions and Sales of Fund Shares		19.36	%		13.08	%		9.58	%
S&P 500 Index (reflects no deduction for fees, expenses, or taxes)			26.29	%		15.69	%		13.75	%

MANAGEMENT

Investment Adviser: MML Investment Advisers, LLC (“MML Advisers”)

Subadviser(s): J.P. Morgan Investment Management Inc. (“J.P. Morgan”)

Portfolio Manager(s):

Tim Snyder, CFA, CMT is an Executive Director and a portfolio manager at J.P. Morgan. He has managed the Fund since September 2018.

Raffaele Zingone, CFA is a Managing Director and a portfolio manager at J.P. Morgan. He has managed the Fund since September 2018.

PURCHASE AND SALE OF FUND SHARES

Currently, shares of the Fund are only available to other MassMutual Funds, although, at the discretion of the Trust, shares of the Fund may be offered to a broader range of investors at any time. Fund shares are redeemable on any business day by written request.

TAX INFORMATION

The Fund intends to make distributions that may be taxed as ordinary income, qualified dividend income, or capital gains, unless you are an investor eligible for preferential tax treatment.

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MassMutual Select T. Rowe Price Bond Asset Fund

INVESTMENT OBJECTIVE

The Fund seeks a regular level of income consistent with the preservation of capital over time.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund.

Shareholder Fees (fees paid directly from your investment)

			Class I
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)			None
Maximum Deferred Sales Charge (Load) (as a % of the lower of the original offering price or redemption proceeds)			None

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

			Class I
Management Fees			0.00%
Distribution and Service (Rule 12b-1) Fees			None
Other Expenses			0.11%
Total Annual Fund Operating Expenses			0.11%
Expense Reimbursement			(0.11%)
Total Annual Fund Operating Expenses after Expense Reimbursement(1)			0.00%

(1)

The expenses in the above table reflect a written agreement by MML Advisers to cap the fees and expenses of the Fund (other than extraordinary legal and other expenses, Acquired Fund Fees and Expenses, interest expense, expenses related to borrowings, securities lending, leverage, taxes, and brokerage, short sale dividend and loan expense, or other non-recurring or unusual expenses such as organizational expenses and shareholder meeting expenses, as applicable) through January 31, 2025, to the extent that Total Annual Fund Operating Expenses after Expense Reimbursement would otherwise exceed 0.00% for Class I. The Total Annual Fund Operating Expenses after Expense Reimbursement shown in the above table may exceed these amounts, because, as noted in the previous sentence, certain fees and expenses are excluded from the cap. The agreement can only be terminated by mutual consent of the Board of Trustees on behalf of the Fund and MML Advisers.

Example

preceding table. 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 I			$0			$24			$51			$130

Portfolio Turnover

INVESTMENTS, RISKS, AND PERFORMANCE

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in bonds. The Fund’s investments may include, but are not limited to, obligations issued by U.S. and foreign governments and their agencies, bonds issued by U.S. and foreign corporations, U.S. and non-U.S. dollar denominated foreign securities (including securities of emerging market issuers), mortgage- and asset-backed securities, Treasury inflation protected securities, and bank loans (which represent interests in amounts loaned to companies by banks and other lenders). Debt securities in which the Fund invests may pay interest at fixed, variable, or floating rates. The Fund may purchase and sell securities (including mortgage-backed securities) on a when-issued, delayed delivery, to-be-announced (“TBA”), or forward commitment basis, and may enter into dollar roll transactions. These may include so-called “short” TBA transactions, where the Fund attempts to hedge existing exposures or to increase its return by selling forward mortgages or mortgage-related assets it owns.

The Fund may invest up to 30% of its total assets in below investment grade debt securities (“junk” or “high yield” bonds), including securities in default. These “junk” or “high yield” bonds include those that are at the time of investment rated BB+ or equivalent, or lower by each of the rating

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agencies that has assigned a rating to the bond or are unrated and considered by the Fund’s subadviser, T. Rowe Price Associates, Inc. (“T. Rowe Price”), to be of comparable quality. In the event that a security is downgraded after its purchase by the Fund, the Fund may continue to hold the security if T. Rowe Price considers that doing so would be consistent with the Fund’s investment objective. If a bond is split-rated (i.e., assigned different ratings by different credit ratings agencies), the higher rating will be used.

The Fund may (but is not obligated to) use a wide variety of exchange-traded and over-the-counter derivatives, for hedging purposes, to adjust various portfolio characteristics, including the duration (interest rate volatility) of the Fund’s portfolio, or as a substitute for direct investments in securities. Such derivatives may include futures contracts, interest rate swaps, total return swaps, credit default swaps, and options. The Fund may also, but will not necessarily, engage in foreign currency transactions, including forward contracts, options on currencies, futures contracts, and swap contracts, to seek to hedge or to attempt to protect against adverse changes in currency exchange rates or otherwise to adjust the currency exposures within the Fund’s portfolio. Use of derivatives by the Fund may create investment leverage. The Fund may hold a portion of its assets in cash or cash equivalents.

T. Rowe Price has the flexibility to invest the Fund’s assets across the global fixed income universe without constraints tied to particular benchmarks or asset classes in an effort to create a portfolio with low overall volatility and consistent income even in a rising interest rate environment. T. Rowe Price expects that the Fund will normally maintain a relatively concentrated portfolio.

T. Rowe Price has considerable flexibility in seeking income on behalf of the Fund and may invest in bonds with varying maturities. Because the Fund does not have any maturity restrictions, T. Rowe Price can purchase long-term bonds, which tend to have higher yields than shorter-term bonds. The maturities of the Fund’s holdings generally reflect T. Rowe Price’s outlook for interest rates. In addition, when there is a large yield difference between securities of various quality levels, T. Rowe Price may choose to move down the credit scale and purchase lower-rated bonds with higher yields. When the difference is small or the outlook warrants, T. Rowe Price may choose to concentrate investments in higher-rated issues. When deciding whether to adjust duration (which means the

Fund’s price sensitivity to interest rate changes) or allocations among the various sectors and asset classes, T. Rowe Price weighs such factors as expected interest rate movements and currency valuations, the outlook for inflation and the economy, and the yield advantage that lower rated bonds may offer over investment-grade bonds.

T. Rowe Price may sell assets for a variety of reasons, including in response to a change in the original investment considerations or to limit losses, adjust the characteristics of the overall portfolio, or redeploy assets into different opportunities.

The Fund expects that it will engage in active and frequent trading and so will typically have a relatively high portfolio turnover rate.

Principal Risks

The following are the Principal Risks of the Fund. The value of your investment in the Fund could go down as well as up. You can lose money by investing in the Fund. References in this section to the Fund’s subadviser may include any sub-subadvisers as applicable. Certain risks relating to instruments and strategies used in the management of the Fund are placed first. The significance of any specific risk to an investment in the Fund will vary over time, depending on the composition of the Fund’s portfolio, market conditions, and other factors. You should read all of the risk information presented below carefully, because any one or more of these risks may result in losses to the Fund.

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that the value of a fixed income security will fall when interest rates rise), extension risk (the risk that the average life of a security will be extended through a slowing of principal payments), prepayment risk (the risk that a security will be prepaid and the Fund will be required to reinvest at a less favorable rate), duration risk (the risk that longer-term securities may be more sensitive to interest rate changes), inflation risk (the risk that as inflation increases, the present value of the Fund’s fixed income investment typically will decline), and credit risk.

Bank Loans Risk Many of the risks associated with bank loans are similar to the risks of investing in below investment grade debt securities. Changes in the financial condition of the borrower or economic conditions or other circumstances may reduce the capacity of the borrower to make principal and interest payments on such instruments and may lead to defaults. Senior secured bank loans are typically supported by collateral; however the value of the collateral may be insufficient to cover the amount owed to the Fund, or the Fund may be prevented or delayed from realizing on the collateral. Some loans may be unsecured; unsecured loans generally present a greater risk of loss to the Fund if the issuer defaults. If the Fund relies on a third party to administer a loan, the Fund is subject to the risk that the third party will fail to perform its obligations. In addition, if the Fund holds only a participation interest in a loan made by a third party, the Fund’s receipt of payments on the loan will depend on the third party’s willingness and ability to make those payments to the Fund. The settlement time for certain loans is longer than the settlement time for many other types of investments, and the Fund may not receive the payment for a loan sold by it until well after the sale; that cash would be unavailable for payment of redemption proceeds or for reinvestment. Interests in some bank loans may not be readily marketable and may be subject to restrictions on resale. In some cases, negotiations involved in disposing of indebtedness may require weeks to complete. Consequently, some indebtedness may be difficult or impossible to dispose of readily at what the Fund believes to be a fair price. Some loans may not be considered “securities” for certain purposes under the federal securities laws, and purchasers, such as the Fund, therefore may not be entitled to rely on the anti-fraud protections of the federal securities laws.

Below Investment Grade Debt Securities Risk Below investment grade debt securities, commonly known

as “junk” or “high yield” bonds, have speculative characteristics and involve greater volatility of price and yield, greater risk of loss of principal and interest, and generally reflect a greater possibility of an adverse change in financial condition that could affect an issuer’s ability to honor its obligations.

Credit Risk Credit risk is the risk that an issuer, guarantor, or liquidity provider of a fixed income security held by the Fund may be unable or unwilling, or may be perceived (whether by market participants, ratings agencies, pricing services or otherwise) as unable or unwilling, to make timely principal and/or interest payments, or to otherwise honor its obligations. The Fund may also be exposed to the credit risk of its counterparty to repurchase agreements, reverse repurchase agreements, swap transactions, and other derivatives transactions, and to the counterparty’s ability or willingness to perform in accordance with the terms of the transaction. The value of such transactions to the Fund will depend on the willingness and ability of the counterparty to perform its obligations, including among other things the obligation to return collateral or margin to the Fund. If a counterparty becomes bankrupt or otherwise fails to perform its obligations under a derivative contract due to financial difficulties, the Fund may experience significant delays in obtaining any recovery under the derivative contract in a bankruptcy or other reorganization proceeding. The Fund may obtain only a limited recovery or may obtain no recovery in such circumstances.

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Foreign Investment Risk; Emerging Markets Risk; Currency Risk Investments in securities of foreign issuers, securities of companies with significant foreign exposure, and foreign currencies can involve additional risks relating to market, industry, political, regulatory, public health, and other conditions. Political, social, diplomatic, and economic developments, U.S. and foreign government action, or threat thereof, such as the imposition of currency or capital blockages, controls, or tariffs, economic and trade sanctions or embargoes, security trading suspensions, entering or exiting trade or other intergovernmental agreements, or the expropriation or nationalization of assets in a particular country, can cause dramatic declines in certain or all securities with exposure to that country and other countries. Sanctions, or the threat of sanctions, may cause volatility in regional and global markets and may negatively impact the performance of various sectors and industries, as well as companies in other countries, which could have a negative effect on the performance of the Fund. In the event of nationalization, expropriation, confiscation, or other government action, intervention, or restriction, the Fund could lose its entire investment in a particular foreign issuer or country. There may be quotas or other limits on the ability of the Fund (or clients of the Fund’s investment adviser or subadviser) to invest or maintain investments in securities of issuers in certain countries. Enforcing legal rights can be more difficult, costly, and limited in certain foreign countries and with respect to certain types of investments, and can be particularly difficult against foreign governments. Because non-U.S. securities are normally denominated and traded in currencies other than the U.S. dollar, the value of the Fund’s assets may be affected favorably or unfavorably by changes in currency exchange rates, exchange control regulations, and restrictions or prohibitions on the repatriation of non-U.S. currencies. Income and gains with respect to investments in certain countries may be subject to withholding and other taxes. There may be less information publicly available about a non-U.S. company than about a U.S. company, and many non-U.S. companies are not subject to accounting, auditing, and financial reporting standards, regulatory framework and practices comparable to those in the U.S. The securities of some non-U.S. companies, especially those in emerging markets, are less liquid and at times more volatile than securities of comparable U.S. companies. Emerging markets securities are subject to greater risks than

securities issued in developed foreign markets, including less liquidity, less stringent investor protection and disclosure standards, less reliable settlement practices, greater price volatility, higher relative rates of inflation, greater political, economic, and social instability, greater custody and operational risks, greater risk of new or inconsistent government treatment of or restrictions on issuers and instruments, and greater volatility in currency exchange rates, and are more susceptible to environmental problems. Many emerging market countries are highly reliant on international trade and exports, including the export of commodities. Their economies may be significantly impacted by fluctuations in commodity prices and the global demand for certain commodities. In addition, pandemics and outbreaks of contagious diseases may exacerbate pre-existing problems in emerging market countries with less established health care systems. Frontier markets, a subset of emerging markets, generally have smaller economies and less mature capital markets than emerging markets. As a result, the risks of investing in emerging market countries are magnified in frontier market countries. Frontier markets are more susceptible to having abrupt changes in currency values, less mature markets and settlement practices, and lower trading volumes that could lead to greater price volatility and illiquidity. Non-U.S. transaction costs, such as brokerage commissions and custody costs, may be higher than in the United States. In addition, foreign markets can react differently to market, economic, industry, political, regulatory, geopolitical, public health, and other conditions than the U.S. market.

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the servicing of mortgage loans secured by real estate properties. During periods of difficult economic conditions, delinquencies and losses on commercial mortgage-backed investments in particular generally increase, including as a result of the effects of those conditions on commercial real estate markets, the ability of commercial tenants to make loan payments, and the ability of a property to attract and retain commercial tenants. Investments that receive only the interest portion or the principal portion of payments on the underlying assets may be highly volatile. Litigation with respect to the representations and warranties given in connection with the issuance of mortgage-backed securities can be an important consideration in investing in such securities, and the outcome of any such litigation could significantly impact the value of the Fund’s mortgage-backed investments.

Defaulted and Distressed Securities Risk Because the issuer of such securities is in default and is likely to be in distressed financial condition, repayment of defaulted securities and obligations of distressed issuers (including insolvent issuers or issuers in payment or covenant default, in workout or restructuring, or in bankruptcy or insolvency proceedings) is uncertain. To the extent the Fund is invested in distressed securities, its ability to achieve current income for its shareholders may be diminished.

Dollar Roll Transaction Risk Dollar roll transactions generally create leverage and subject the Fund to the credit risk of the counterparty.

Frequent Trading/Portfolio Turnover Risk Portfolio turnover generally involves some expense to the Fund and may result in the realization of taxable capital gains (including short-term gains). The trading costs and tax effects associated with portfolio turnover may adversely affect the Fund’s performance.

Geographic Focus Risk When the Fund focuses investments on a particular country, group of countries, or geographic region, its performance will be closely tied to the market, currency, economic, political, or regulatory conditions and developments in those countries or that region, and could be more volatile than the performance of more geographically diversified funds.

Hedging Risk The Fund’s attempts at hedging and taking long and short positions in currencies may not be successful and could cause the Fund to lose money or fail to get the benefit of a gain on a hedged position. If expected changes to securities prices, interest rates, currency values, and exchange rates, or the creditworthiness of an issuer are not accurately predicted, the Fund could be in a worse position than if it had not entered into such transactions.

Inflation Risk The value of assets or income from the Fund’s investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Fund’s assets can decline as can the value of the Fund’s distributions. Inflation rates may change frequently and drastically as a result of various factors, including unexpected shifts in the domestic or global economy (or expectations that such policies will change), and the Fund’s investments may not keep pace with inflation, which may result in losses to the Fund’s investors.

Leveraging Risk Instruments and transactions, including derivatives transactions, that create leverage may cause the value of an investment in the Fund to be more volatile, could result in larger losses than if they were not used, and tend to compound the effects of other risks.

LIBOR Transition and Other Reference Benchmarks Risk The London Interbank Offered Rate (“LIBOR”) was the offered rate for short-term Eurodollar deposits between major international banks. The terms of investments, financings, or other transactions (including certain derivatives transactions) to which the Fund may be a party have historically been tied to LIBOR. In connection with the global transition away from LIBOR led by regulators and market participants, LIBOR was last published on a representative basis at the end of June 2023. Alternative reference rates to LIBOR have been established in most major currencies and the transition to new reference rates continues. Markets in these new rates are developing, but questions around liquidity and how to appropriately mitigate any economic value transfer as a result of the transition remain a concern. The transition away from LIBOR and the use of replacement rates may adversely affect transactions that used LIBOR as a reference rate, financial institutions, funds, and other market participants that engaged in such transactions, and the financial markets generally. The impact of the transition away from LIBOR on the Fund or

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the financial instruments in which the Fund invests cannot yet be fully determined. In addition, interest rates or other types of rates and indexes which are classed as “benchmarks” have been the subject of ongoing national and international regulatory reform, including under the European Union regulation on indexes used as benchmarks in financial instruments and financial contracts (known as the “Benchmarks Regulation”). The Benchmarks Regulation has been enacted into United Kingdom law by virtue of the European Union (Withdrawal) Act 2018 (as amended), subject to amendments made by the Benchmarks (Amendment and Transitional Provision) (EU Exit) Regulations 2019 (SI 2019/657) and other statutory instruments. Following the implementation of these reforms, the manner of administration of benchmarks has changed and may further change in the future, with the result that relevant benchmarks may perform differently than in the past, the use of benchmarks that are not compliant with the new standards set by certain supervised entities may be restricted, and certain benchmarks may be eliminated entirely. Additionally, there could be other consequences which cannot be predicted.

Market Risk The value of the Fund’s portfolio securities may decline, at times sharply and

unpredictably, as a result of unfavorable market-induced changes affecting particular industries, sectors, or issuers. Stock and bond markets can decline significantly in response to issuer, market, economic, industry, political, regulatory, geopolitical, public health, and other conditions, as well as investor perceptions of these conditions. The Fund is subject to risks affecting issuers, such as management performance, financial leverage, industry problems, and reduced demand for goods or services.

Reinvestment Risk Income from the Fund’s portfolio will decline if and when the Fund invests the proceeds from matured, traded, or called debt obligations at market interest rates that are below the portfolio’s current earnings rate. A decline in income could affect the Fund’s overall return.

Short Sales Risk If the Fund sells a security short, it will make money if the security’s price goes down (in an amount greater than any transaction costs) and will lose money if the security’s price goes up. There is no limit on the amount of money the Fund may lose on a short sale. The Fund may not be able to close out a short sale when it might wish to do so, or may only do so at an unfavorable price. Short sales can involve leverage. If the Fund invests the proceeds from short positions in other securities the Fund could lose money both on the short positions and on the securities in which it has invested the short proceeds.

Sovereign Debt Obligations Risk Investments in debt securities issued by governments or by government agencies and instrumentalities involve the risk that the governmental entities responsible for repayment may be unable or unwilling to pay interest and repay principal when due. Many sovereign debt obligations may be rated below investment grade (“junk” or “high yield” bonds). Any restructuring of a sovereign debt obligation held by the Fund will likely have a significant adverse effect on the value of the obligation. In the event of default of sovereign debt, the Fund may be unable to pursue legal action against the sovereign issuer or to realize on collateral securing the debt.

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U.S. Government Securities Risk Obligations of certain U.S. Government agencies and instrumentalities are not backed by the full faith and credit of the U.S. Government, and there can be no assurance that the U.S. Government would provide financial support to such agencies and instrumentalities.

Valuation Risk The Fund is subject to the risk of mispricing or improper valuation of its investments, in particular to the extent that its securities are fair valued.

When-Issued, Delayed Delivery, TBA, and Forward Commitment Transaction Risk These transactions may create leverage and involve a risk of loss if the value of the securities declines prior to settlement.

Performance Information

Annual Performance

Class I Shares

[MISSING IMAGE: ampibl6p7crjffu1ai4cvp5knsai.jpg]

Highest
Quarter:

4Q ’23,

6.46%

Lowest
Quarter:

2Q ’22,

–5.73%

Average Annual Total Returns

(for the periods ended December 31, 2023)

		One Year			Five Years			Since Inception (02/09/18)
Class I	Return Before Taxes		6.59	%		1.25	%		1.16	%
	Return After Taxes on Distributions		5.63	%		-0.19	%		-0.30	%
	Return After Taxes on Distributions and Sales of Fund Shares		3.89	%		0.41	%		0.32	%
Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)			5.53	%		1.10	%		1.28	%

MANAGEMENT

Investment Adviser: MML Investment Advisers, LLC (“MML Advisers”)

Subadviser(s): T. Rowe Price Associates, Inc. (“T. Rowe Price”)

Sub-subadviser(s): T. Rowe Price International Ltd (“T. Rowe Price International”)

T. Rowe Price Hong Kong Limited (“T. Rowe Price Hong Kong”)

Portfolio Manager(s):

Steve Bartolini, CFA is a Vice President and Portfolio Manager at T. Rowe Price. He has managed the Fund since its inception (February 2018).

Andrew J. Keirle is a Vice President at and Portfolio Manager at T. Rowe Price International. He has managed the Fund since February 2023.

Ken Orchard, CFA is a Vice President and Portfolio Manager at T. Rowe Price International. He has managed the Fund since its inception (February 2018).

Saurabh Sud, CFA is a Vice President and Portfolio Manager at T. Rowe Price. He has managed the Fund since May 2023.

PURCHASE AND SALE OF FUND SHARES

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TAX INFORMATION

The Fund intends to make distributions that may be taxed as ordinary income, qualified dividend income, or capital gains, unless you are an investor eligible for preferential tax treatment.

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MassMutual Select T. Rowe Price Emerging Markets Bond Fund

INVESTMENT OBJECTIVE

The Fund seeks to provide high income and capital appreciation.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund.

Shareholder Fees (fees paid directly from your investment)

			Class I
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)			None
Maximum Deferred Sales Charge (Load) (as a % of the lower of the original offering price or redemption proceeds)			None

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

			Class I
Management Fees			0.00%
Distribution and Service (Rule 12b-1) Fees			None
Other Expenses			0.25%
Total Annual Fund Operating Expenses			0.25%
Expense Reimbursement			(0.25%)
Total Annual Fund Operating Expenses after Expense Reimbursement(1)			0.00%

(1)

Example

preceding table. 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 I			$0			$55			$115			$293

Portfolio Turnover

INVESTMENTS, RISKS, AND PERFORMANCE

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in debt securities of emerging market governments or companies located in emerging market countries (including so-called “frontier markets”). The Fund’s investments in debt securities typically consist of corporate and sovereign bonds. Debt securities in which the Fund invests may pay interest at fixed, variable, or floating rates. The Fund relies on a classification by either J.P. Morgan or the International Monetary Fund to determine which countries are considered emerging markets. The Fund may invest in securities denominated in U.S.-dollar or foreign currencies, including emerging market currencies. The Fund normally will invest in at least three countries.

The Fund may invest in debt securities of any credit quality and may invest without limit in below investment grade debt securities (“junk” or “high yield” bonds), including securities in default. These “junk” or “high yield” bonds include those that are at the time of investment rated BB+ or lower by S&P or Ba1 or lower by Moody’s or the equivalent by any other nationally recognized statistical rating organization or are unrated and considered by the Fund’s subadviser, T. Rowe Price Associates, Inc. (“T. Rowe Price”), to be of comparable quality. Although the Fund expects to maintain an intermediate- to long-term weighted

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average maturity, there are no maturity restrictions on the overall portfolio or on individual securities.

In selecting securities, T. Rowe Price relies heavily on research, which analyzes political and economic trends as well as creditworthiness of particular issuers. T. Rowe Price tends to favor bonds it expects will be upgraded. T. Rowe Price may sell assets for a variety of reasons, including in response to a change in the original investment considerations or to limit losses, adjust the characteristics of the overall portfolio, or redeploy assets into different opportunities.

Principal Risks

security or issuer or fixed income securities generally. Certain events, such as market or economic developments, regulatory or government actions, natural disasters, pandemics, terrorist attacks, war, and other geopolitical events can have a dramatic adverse effect on the debt market and the overall liquidity of the market for fixed income securities. During those periods, the Fund may experience high levels of shareholder redemptions, and may have to sell securities at times when the Fund would otherwise not do so, and potentially at unfavorable prices. Certain securities may be difficult to value during such periods. Fixed income securities are subject to interest rate risk (the risk that the value of a fixed income security will fall when interest rates rise), extension risk (the risk that the average life of a security will be extended through a slowing of principal payments), prepayment risk (the risk that a security will be prepaid and the Fund will be required to reinvest at a less favorable rate), duration risk (the risk that longer-term securities may be more sensitive to interest rate changes), inflation risk (the risk that as inflation increases, the present value of the Fund’s fixed income investment typically will decline), and credit risk.

Below Investment Grade Debt Securities Risk Below investment grade debt securities, commonly known as “junk” or “high yield” bonds, have speculative characteristics and involve greater volatility of price and yield, greater risk of loss of principal and interest, and generally reflect a greater possibility of an adverse change in financial condition that could affect an issuer’s ability to honor its obligations.

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or otherwise fails to perform its obligations under a derivative contract due to financial difficulties, the Fund may experience significant delays in obtaining any recovery under the derivative contract in a bankruptcy or other reorganization proceeding. The Fund may obtain only a limited recovery or may obtain no recovery in such circumstances.

There may be quotas or other limits on the ability of the Fund (or clients of the Fund’s investment adviser or subadviser) to invest or maintain investments in securities of issuers in certain countries. Enforcing legal rights can be more difficult, costly, and limited in certain foreign countries and with respect to certain types of investments, and can be particularly difficult against foreign governments. Because non-U.S. securities are normally denominated and traded in currencies other than the U.S. dollar, the value of the Fund’s assets may be affected favorably or unfavorably by changes in currency exchange rates, exchange control regulations, and restrictions or prohibitions on the repatriation of non-U.S. currencies. Income and gains with respect to investments in certain countries may be subject to withholding and other taxes. There may be less information publicly available about a non-U.S. company than about a U.S. company, and many non-U.S. companies are not subject to accounting, auditing, and financial reporting standards, regulatory framework and practices comparable to those in the U.S. The securities of some non-U.S. companies, especially those in emerging markets, are less liquid and at times more volatile than securities of comparable U.S. companies. Emerging markets securities are subject to greater risks than securities issued in developed foreign markets, including less liquidity, less stringent investor protection and disclosure standards, less reliable settlement practices, greater price volatility, higher relative rates of inflation, greater political, economic, and social instability, greater custody and operational risks, greater risk of new or inconsistent government treatment of or restrictions on issuers and instruments, and greater volatility in currency exchange rates, and are more susceptible to environmental problems. Many emerging market countries are highly reliant on international trade and exports, including the export of commodities. Their economies may be significantly impacted by fluctuations in commodity prices and the global demand for certain commodities. In addition, pandemics and outbreaks of contagious diseases may exacerbate pre-existing problems in emerging market countries with less established health care systems. Frontier markets, a subset of emerging markets, generally have smaller economies and less mature capital markets than emerging markets. As a result, the risks of investing in emerging market countries are magnified in frontier market countries. Frontier markets are more susceptible to having abrupt changes in currency values, less mature markets and

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settlement practices, and lower trading volumes that could lead to greater price volatility and illiquidity. Non-U.S. transaction costs, such as brokerage commissions and custody costs, may be higher than in the United States. In addition, foreign markets can react differently to market, economic, industry, political, regulatory, geopolitical, public health, and other conditions than the U.S. market.

will change), and the Fund’s investments may not keep pace with inflation, which may result in losses to the Fund’s investors.

Market Risk The value of the Fund’s portfolio securities may decline, at times sharply and unpredictably, as a result of unfavorable market-induced changes affecting particular industries, sectors, or issuers. Stock and bond markets can decline significantly in response to issuer, market, economic, industry, political, regulatory, geopolitical, public health, and other conditions, as well as investor perceptions of these conditions. The Fund is subject to risks affecting issuers, such as management performance, financial leverage, industry problems, and reduced demand for goods or services.

Reinvestment Risk Income from the Fund’s portfolio will decline if and when the Fund invests the proceeds from matured, traded, or called debt obligations at market interest rates that are below

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the portfolio’s current earnings rate. A decline in income could affect the Fund’s overall return.

Valuation Risk The Fund is subject to the risk of mispricing or improper valuation of its investments, in particular to the extent that its securities are fair valued.

Performance Information

The following bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance from year to year for Class I shares. The table shows how the Fund’s average annual returns for 1 and 5 years, and since inception, compare with those of a broad measure of market performance and an additional index that has characteristics similar to those of the Fund (J.P. Morgan Emerging Markets Bond Index Global Diversified). Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Annual Performance

Class I Shares

[MISSING IMAGE: t1850ktk3c1lp6pk01iivmp2c7p8.jpg]

Highest
Quarter:

2Q ’20,

13.51%

Lowest
Quarter:

1Q ’20,

–16.08%

Average Annual Total Returns

(for the periods ended December 31, 2023)

		One Year			Five Years			Since Inception (02/09/18)
Class I	Return Before Taxes		13.50	%		2.21	%		0.84	%
	Return After Taxes on Distributions		10.75	%		-0.14	%		-1.37	%
	Return After Taxes on Distributions and Sales of Fund Shares		7.94	%		0.72	%		-0.27	%
Bloomberg Emerging Markets Hard Currency (USD) Aggregate Index (reflects no deduction for fees, expenses, or taxes)			9.63	%		1.36	%		0.79	%
J.P. Morgan Emerging Markets Bond Index Global Diversified (reflects no deduction for fees, expenses, or taxes)			11.09	%		1.67	%		1.10	%

MANAGEMENT

Investment Adviser: MML Investment Advisers, LLC (“MML Advisers”)

Subadviser(s): T. Rowe Price Associates, Inc. (“T. Rowe Price”)

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Sub-subadviser(s): T. Rowe Price International Ltd (“T. Rowe Price International”)

T. Rowe Price Hong Kong Limited (“T. Rowe Price Hong Kong”)

Portfolio Manager(s):

Samy Muaddi is a Vice President and Portfolio Manager at T. Rowe Price. He has managed the Fund since June 2020.

PURCHASE AND SALE OF FUND SHARES

Currently, shares of the Fund are only available to other MassMutual Funds, although, at the discretion of the Trust, shares of the Fund may be

offered to a broader range of investors at any time. Fund shares are redeemable on any business day by written request.

TAX INFORMATION

The Fund intends to make distributions that may be taxed as ordinary income, qualified dividend income, or capital gains, unless you are an investor eligible for preferential tax treatment.

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MassMutual Select T. Rowe Price Large Cap Blend Fund

INVESTMENT OBJECTIVE

The Fund seeks long-term capital appreciation through investments in common stock.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund.

Shareholder Fees (fees paid directly from your investment)

			Class I
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)			None
Maximum Deferred Sales Charge (Load) (as a % of the lower of the original offering price or redemption proceeds)			None

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

			Class I
Management Fees			0.00%
Distribution and Service (Rule 12b-1) Fees			None
Other Expenses			0.03%
Total Annual Fund Operating Expenses			0.03%
Expense Reimbursement			(0.03%)
Total Annual Fund Operating Expenses after Expense Reimbursement(1)			0.00%

(1)

Example

preceding table. 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 I			$0			$7			$14			$36

Portfolio Turnover

INVESTMENTS, RISKS, AND PERFORMANCE

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of large cap companies. The Fund’s subadviser, T. Rowe Price Associates, Inc. (“T. Rowe Price”), currently defines “large cap” companies as those whose market capitalizations at the time of purchase are within the market capitalization range of companies included in the S&P 500® Index or the Russell 1000® Index (as of December 31, 2023, between $270.19 million and $2.99 trillion). The Fund may invest up to 20% of its net assets in companies whose market capitalizations at the time of investment are outside of that capitalization range. Equity securities may include common stocks, preferred stocks, securities convertible into common or preferred stock, rights, warrants, and real estate investment trusts (“REITs”). The Fund typically invests most of its assets in common stocks of U.S. companies, but may invest up to 30% of its total assets in foreign securities and American Depositary Receipts (“ADRs”), including emerging market securities. The Fund may at times invest a substantial portion of its assets in obligations of issuers in one or more market, economic, or industry sectors such as information technology companies. The Fund may (but is not obligated to) use a wide variety of exchange-traded and over-the-counter derivatives, for hedging purposes, to adjust various

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portfolio characteristics, or as a substitute for direct investments in securities. Such derivatives may include futures contracts, swaps, and options. The Fund may also, but will not necessarily, engage in foreign currency transactions, including forward contracts, options on currencies, futures contracts, and swap contracts, to seek to hedge or to attempt to protect against adverse changes in currency exchange rates or otherwise to adjust the currency exposures within the Fund’s portfolio. Use of derivatives by the Fund may create investment leverage. The Fund’s investments may include holdings in privately held companies and companies that only recently began to trade publicly. The Fund may hold a portion of its assets in cash or cash equivalents.

The Fund’s holdings will be widely diversified by industry and issuer. T. Rowe Price may employ a growth or value approach in selecting investments. For example, T. Rowe Price may seek to identify companies whose price/earnings ratios are attractive relative to the underlying earnings growth rates (e.g., emerging growth companies) and/or companies that appear to be undervalued by various measures and may be temporarily out of favor but have good prospects for capital appreciation.

T. Rowe Price generally looks for companies with one or more of the following: strong cash flow; an above-average rate of earnings growth; the ability to sustain earnings momentum during economic downturns; occupation of a lucrative niche in the economy and the ability to expand even during times of slow economic growth; low price/earnings, price/book value, price/sales, or price/cash flow ratios relative to the S&P 500 Index, a company’s peers, or a company’s own historical norm; low stock price relative to a company’s underlying asset values; companies that may benefit from restructuring activity and/or a sound balance sheet and other positive financial characteristics; and a seasoned management team with a track record of providing superior financial results.

In pursuing the Fund’s investment objective, T. Rowe Price has the discretion to purchase some securities that do not meet its normal investment criteria described above, when it believes there is an opportunity for substantial appreciation (such as, for example, T. Rowe Price believes a security could increase in value as a result of a change in management, an extraordinary corporate event, a new product introduction or innovation, or a favorable competitive development).

The Fund expects that it will engage in active and frequent trading and so will typically have a relatively high portfolio turnover rate.

Principal Risks

Equity Securities Risk Although stocks may have the potential to outperform other asset classes over the long term, their prices tend to fluctuate more dramatically over the shorter term. These movements may result from factors affecting individual companies, or from broader influences like changes in interest rates, market conditions, or investor confidence, or announcements of economic, political, or financial information.

Foreign Investment Risk; Emerging Markets Risk; Currency Risk Investments in securities of foreign issuers, securities of companies with significant

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foreign exposure, and foreign currencies can involve additional risks relating to market, industry, political, regulatory, public health, and other conditions. Political, social, diplomatic, and economic developments, U.S. and foreign government action, or threat thereof, such as the imposition of currency or capital blockages, controls, or tariffs, economic and trade sanctions or embargoes, security trading suspensions, entering or exiting trade or other intergovernmental agreements, or the expropriation or nationalization of assets in a particular country, can cause dramatic declines in certain or all securities with exposure to that country and other countries. Sanctions, or the threat of sanctions, may cause volatility in regional and global markets and may negatively impact the performance of various sectors and industries, as well as companies in other countries, which could have a negative effect on the performance of the Fund. In the event of nationalization, expropriation, confiscation, or other government action, intervention, or restriction, the Fund could lose its entire investment in a particular foreign issuer or country. There may be quotas or other limits on the ability of the Fund (or clients of the Fund’s investment adviser or subadviser) to invest or maintain investments in securities of issuers in certain countries. Enforcing legal rights can be more difficult, costly, and limited in certain foreign countries and with respect to certain types of investments, and can be particularly difficult against foreign governments. Because non-U.S. securities are normally denominated and traded in currencies other than the U.S. dollar, the value of the Fund’s assets may be affected favorably or unfavorably by changes in currency exchange rates, exchange control regulations, and restrictions or prohibitions on the repatriation of non-U.S. currencies. Income and gains with respect to investments in certain countries may be subject to withholding and other taxes. There may be less information publicly available about a non-U.S. company than about a U.S. company, and many non-U.S. companies are not subject to accounting, auditing, and financial reporting standards, regulatory framework and practices comparable to those in the U.S. The securities of some non-U.S. companies, especially those in emerging markets, are less liquid and at times more volatile than securities of comparable U.S. companies. Emerging markets securities are subject to greater risks than securities issued in developed foreign markets, including less liquidity, less stringent investor protection and disclosure standards, less reliable

settlement practices, greater price volatility, higher relative rates of inflation, greater political, economic, and social instability, greater custody and operational risks, greater risk of new or inconsistent government treatment of or restrictions on issuers and instruments, and greater volatility in currency exchange rates, and are more susceptible to environmental problems. Many emerging market countries are highly reliant on international trade and exports, including the export of commodities. Their economies may be significantly impacted by fluctuations in commodity prices and the global demand for certain commodities. In addition, pandemics and outbreaks of contagious diseases may exacerbate pre-existing problems in emerging market countries with less established health care systems. Frontier markets, a subset of emerging markets, generally have smaller economies and less mature capital markets than emerging markets. As a result, the risks of investing in emerging market countries are magnified in frontier market countries. Frontier markets are more susceptible to having abrupt changes in currency values, less mature markets and settlement practices, and lower trading volumes that could lead to greater price volatility and illiquidity. Non-U.S. transaction costs, such as brokerage commissions and custody costs, may be higher than in the United States. In addition, foreign markets can react differently to market, economic, industry, political, regulatory, geopolitical, public health, and other conditions than the U.S. market.

Small and Mid-Cap Company Risk Market risk and liquidity risk are particularly pronounced for securities of small and medium-sized companies, which may trade less frequently and in smaller volumes than more widely-held securities, and may fluctuate in price more than other securities. Their shares can be less liquid than those of larger

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companies, especially during market declines. Small and medium-sized companies may have limited product lines, markets, or financial resources and may be dependent on a limited management group; they may have been recently organized and have little or no track record of success.

Convertible Securities Risk Convertible securities are subject to the risks of both debt instruments and equity securities. The price of a convertible security may change in response to changes in price of the underlying equity security, the credit quality of the issuer, and interest rates. In general, the values of convertible securities tend to decline as interest rates rise and to rise when interest rates fall. A convertible security generally has less potential for gain or loss than the underlying equity security.

to meet redemptions or other cash needs. Some securities may be subject to restrictions on resale. There can be no assurance that there will be a liquid market for instruments held by the Fund at any time. The Fund may not receive the proceeds from the sale of certain investments for an extended period.

Preferred Stock Risk Like other equity securities, preferred stock is subject to the risk that its value may decrease based on actual or perceived changes in the business or financial condition of the issuer. In addition, changes in interest rates may adversely affect the value of a preferred stock that pays a fixed dividend. Preferred stocks are also subject to additional risks, such as potentially greater volatility and risks related to deferral, non-cumulative dividends, subordination, liquidity, limited voting rights, and special redemption rights.

REIT Risk Investments in REITs may be subject to risks similar to those associated with direct investment in real estate, as well as additional risks associated with equity investments. As a shareholder in a REIT, the Fund, and indirectly the Fund’s shareholders, would bear its ratable share of the REIT’s expenses and would at the same time continue to pay its own fees and expenses.

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Restricted Securities Risk The Fund may hold securities that are restricted as to resale under the U.S. federal securities laws, such as securities in certain privately held companies. Such securities may be highly illiquid and their values may experience significant volatility. Restricted securities may be difficult to value.

Valuation Risk The Fund is subject to the risk of mispricing or improper valuation of its investments, in particular to the extent that its securities are fair valued.

Performance Information

Annual Performance

Class I Shares

[MISSING IMAGE: c9ufj563igvrspiprgu1eib7f04u.jpg]

Highest
Quarter:

2Q ’20,

22.13%

Lowest
Quarter:

1Q ’20,

–19.88%

Average Annual Total Returns

(for the periods ended December 31, 2023)

		One Year			Five Years			Since Inception (02/09/18)
Class I	Return Before Taxes		28.22	%		14.39	%		11.17	%
	Return After Taxes on Distributions		27.32	%		12.47	%		9.55	%
	Return After Taxes on Distributions and Sales of Fund Shares		17.14	%		11.25	%		8.69	%
Russell 1000 Index (reflects no deduction for fees, expenses, or taxes)			26.53	%		15.52	%		12.76	%

MANAGEMENT

Investment Adviser: MML Investment Advisers, LLC (“MML Advisers”)

Subadviser(s): T. Rowe Price Associates, Inc. (“T. Rowe Price”)

Portfolio Manager(s):

Shawn T. Driscoll is a Vice President and Portfolio Manager at T. Rowe Price. He has managed the Fund since April 2022.

Joe Fath, CPA is a Vice President and Portfolio Manager at T. Rowe Price. He has managed the Fund since its inception (February 2018).

Ryan S. Hedrick is a Vice President and Portfolio Manager at T. Rowe Price. He has managed the Fund since January 2023.

Ann M. Holcomb, CFA is a Vice President and Portfolio Manager at T. Rowe Price. She has managed the Fund since October 2021.

Jason Nogueira, CFA is a Vice President and Portfolio Manager at T. Rowe Price. He has managed the Fund since October 2021.

Jason Benjamin Polun, CFA is a Vice President and Portfolio Manager at T. Rowe Price. He has managed the Fund since October 2021.

PURCHASE AND SALE OF FUND SHARES

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TAX INFORMATION

The Fund intends to make distributions that may be taxed as ordinary income, qualified dividend income, or capital gains, unless you are an investor eligible for preferential tax treatment.

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MassMutual Select T. Rowe Price Limited Duration Inflation Focused Bond Fund

INVESTMENT OBJECTIVE

The Fund seeks a level of income that is consistent with the current rate of inflation.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund.

Shareholder Fees (fees paid directly from your investment)

			Class I
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)			None
Maximum Deferred Sales Charge (Load) (as a % of the lower of the original offering price or redemption proceeds)			None

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

			Class I
Management Fees			0.00%
Distribution and Service (Rule 12b-1) Fees			None
Other Expenses			0.10%
Total Annual Fund Operating Expenses			0.10%
Expense Reimbursement			(0.10)%
Total Annual Fund Operating Expenses after Expense Reimbursement(1)			0.00%

(1)

Example

preceding table. 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 I			$0			$22			$46			$118

Portfolio Turnover

INVESTMENTS, RISKS, AND PERFORMANCE

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in bonds. The Fund invests in a diversified portfolio of short- and intermediate-term investment-grade bonds. The Fund’s investments may include inflation-linked securities, including Treasury Inflation Protected Securities, as well as corporate, government, mortgage-backed, and asset-backed securities. The Fund may also invest in money market securities, bank obligations, collateralized mortgage obligations, and foreign securities. The Fund will invest at least 20% of its net assets in inflation-linked securities, although normally the Fund expects to invest 50% or more of its net assets in inflation-linked securities. Although the Fund may invest in debt securities of any maturity or duration, the Fund will normally maintain a weighted average duration within plus (+) or minus (-) two years of the duration of the Bloomberg U.S. 1-5 Year Treasury TIPS Index. As of December 31, 2023, the duration of the Bloomberg U.S. 1-5 Year Treasury TIPS Index was approximately 2.64 years and its duration ranged from 0.09 years to 5.24 years over the past three years. Duration, which is expressed in years, is a calculation that attempts to measure the price sensitivity of a bond or bond fund to changes in interest rates. The longer a bond fund’s duration, the more sensitive that fund should be to changes

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in interest rates. For example, if interest rates rise by 1% and a fixed-rate bond has a duration of 5 years, it is estimated that the principal value of the bond will decrease by approximately 5%.

The Fund will only purchase securities that are rated within the four highest credit rating categories (AAA, AA, A, BBB, or equivalent) at the time of purchase by at least one major credit rating agency or, if unrated, determined to be of comparable quality by the Fund’s subadviser, T. Rowe Price Associates, Inc. (“T. Rowe Price”). In the event that a security is downgraded after its purchase by the Fund, the Fund may continue to hold the security if T. Rowe Price considers that doing so would be consistent with the Fund’s investment objective. The Fund may invest up to 20% of its total assets in non-U.S. dollar-denominated securities and may invest without limitation in U.S. dollar-denominated securities of foreign issuers; any such securities may include investments in emerging markets. The Fund may hold a portion of its assets in cash or cash equivalents.

The Fund may (but is not obligated to) use a wide variety of exchange-traded and over-the-counter derivatives, for hedging purposes, to manage inflation risk, to adjust various portfolio characteristics, including the duration (interest rate volatility) of the Fund’s portfolio, or as a substitute for direct investments in securities. Such derivatives may include futures contracts, interest rate swaps, including inflation swaps, total return swaps, credit default swaps, and options. The Fund may also, but will not necessarily, engage in foreign currency transactions, including forward contracts, options on currencies, futures contracts, and swap contracts, to seek to hedge or to attempt to protect against adverse changes in currency exchange rates or otherwise to adjust the currency exposures within the Fund’s portfolio. Use of derivatives by the Fund may create investment leverage.

In making investment decisions for the Fund, T. Rowe Price considers that investments in inflation-linked securities should provide some protection against the impact of inflation. T. Rowe Price bases its investment decisions on the outlooks for inflation, interest rates, and the overall economy, as well as the prices and yields of the various securities in which the Fund may invest. For example, if T. Rowe Price’s outlook is one of high or rising inflation, the Fund may hold more than 50% of its assets in inflation-linked securities and, if T. Rowe Price believes inflation will be low or

falling, the Fund may focus more on securities that are not indexed to inflation (within the Fund’s investment program). If interest rates are expected to fall, T. Rowe Price may purchase securities with longer maturities in an attempt to seek higher yields and/or capital appreciation. Conversely, if interest rates are expected to rise, T. Rowe Price may seek securities with shorter maturities.

The Fund expects that it will engage in active and frequent trading and so will typically have a relatively high portfolio turnover rate.

Principal Risks

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securities are subject to interest rate risk (the risk that the value of a fixed income security will fall when interest rates rise), extension risk (the risk that the average life of a security will be extended through a slowing of principal payments), prepayment risk (the risk that a security will be prepaid and the Fund will be required to reinvest at a less favorable rate), duration risk (the risk that longer-term securities may be more sensitive to interest rate changes), inflation risk (the risk that as inflation increases, the present value of the Fund’s fixed income investment typically will decline), and credit risk.

Inflation-Linked Securities Risk Such securities may change in value in response to actual or anticipated changes in inflation rates in a manner unanticipated by the Fund’s portfolio manager or investors generally. Inflation-linked securities are subject to fixed income securities risks. When inflation is low, declining, or negative, the Fund’s performance could lag the performance of more conventional bond funds. Inflation rates may change frequently and drastically as a result of various factors, including unexpected shifts in the domestic or global economy (or expectations that such policies will change), and the Fund’s investments may not keep pace with inflation, which may result in losses to the Fund’s investors.

Inflation Protection Risk The Fund’s investments may not provide protection against the adverse effects of an increase in inflation over certain periods or at all. In addition, investments in companies that offer protection from accelerating inflation may underperform other investments. Any inflation protection provided by the Fund may not be sufficient to offset any adverse effects of an increase in inflation on the economy or companies generally. Inflation rates may change frequently and drastically as a result of various factors, including unexpected shifts in the domestic or global economy (or expectations that such policies will change), and the Fund’s investments may not keep pace with inflation, which may result in losses to the Fund’s investors.

repurchase agreements, reverse repurchase agreements, swap transactions, and other derivatives transactions, and to the counterparty’s ability or willingness to perform in accordance with the terms of the transaction. The value of such transactions to the Fund will depend on the willingness and ability of the counterparty to perform its obligations, including among other things the obligation to return collateral or margin to the Fund. If a counterparty becomes bankrupt or otherwise fails to perform its obligations under a derivative contract due to financial difficulties, the Fund may experience significant delays in obtaining any recovery under the derivative contract in a bankruptcy or other reorganization proceeding. The Fund may obtain only a limited recovery or may obtain no recovery in such circumstances.

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Sanctions, or the threat of sanctions, may cause volatility in regional and global markets and may negatively impact the performance of various sectors and industries, as well as companies in other countries, which could have a negative effect on the performance of the Fund. In the event of nationalization, expropriation, confiscation, or other government action, intervention, or restriction, the Fund could lose its entire investment in a particular foreign issuer or country. There may be quotas or other limits on the ability of the Fund (or clients of the Fund’s investment adviser or subadviser) to invest or maintain investments in securities of issuers in certain countries. Enforcing legal rights can be more difficult, costly, and limited in certain foreign countries and with respect to certain types of investments, and can be particularly difficult against foreign governments. Because non-U.S. securities are normally denominated and traded in currencies other than the U.S. dollar, the value of the Fund’s assets may be affected favorably or unfavorably by changes in currency exchange rates, exchange control regulations, and restrictions or prohibitions on the repatriation of non-U.S. currencies. Income and gains with respect to investments in certain countries may be subject to withholding and other taxes. There may be less information publicly available about a non-U.S. company than about a U.S. company, and many non-U.S. companies are not subject to accounting, auditing, and financial reporting standards, regulatory framework and practices comparable to those in the U.S. The securities of some non-U.S. companies, especially those in emerging markets, are less liquid and at times more volatile than securities of comparable U.S. companies. Emerging markets securities are subject to greater risks than securities issued in developed foreign markets, including less liquidity, less stringent investor protection and disclosure standards, less reliable settlement practices, greater price volatility, higher relative rates of inflation, greater political, economic, and social instability, greater custody and operational risks, greater risk of new or inconsistent government treatment of or restrictions on issuers and instruments, and greater volatility in currency exchange rates, and are more susceptible to environmental problems. Many emerging market countries are highly reliant on international trade and exports, including the export of commodities. Their economies may be significantly impacted by fluctuations in commodity prices and the global demand for certain commodities. In addition, pandemics and

outbreaks of contagious diseases may exacerbate pre-existing problems in emerging market countries with less established health care systems. Frontier markets, a subset of emerging markets, generally have smaller economies and less mature capital markets than emerging markets. As a result, the risks of investing in emerging market countries are magnified in frontier market countries. Frontier markets are more susceptible to having abrupt changes in currency values, less mature markets and settlement practices, and lower trading volumes that could lead to greater price volatility and illiquidity. Non-U.S. transaction costs, such as brokerage commissions and custody costs, may be higher than in the United States. In addition, foreign markets can react differently to market, economic, industry, political, regulatory, geopolitical, public health, and other conditions than the U.S. market.

Mortgage- and Asset-Backed Securities Risk Investments in mortgage- and asset-backed securities subject the Fund to credit risk, interest rate risk, extension risk, and prepayment risk, among other risks. Mortgage-backed and asset-backed securities not issued by a government agency generally involve greater credit risk than securities issued by government agencies. Payment of principal and interest generally depends on the cash flows generated by the underlying assets and the terms of the security. The types of mortgages (for example, residential or commercial mortgages) underlying securities held by the Fund may differ and be affected differently by market factors. The Fund’s investments in mortgage-backed securities may make the Fund’s net asset value more susceptible to economic, market, political, and other developments affecting the residential and commercial real estate markets and the servicing of mortgage loans secured by real estate properties. During periods of difficult economic conditions, delinquencies and losses on commercial mortgage-backed investments in particular generally increase, including as a result of the effects of those conditions on commercial real estate markets, the ability of commercial tenants to make loan payments, and the ability of a property to attract and retain commercial tenants. Investments that receive only the interest portion or the principal portion of payments on the underlying assets may be highly volatile. Litigation with respect to the representations and warranties given in connection with the issuance of mortgage-backed securities can be an important consideration in investing in such securities, and the outcome of any such litigation could

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significantly impact the value of the Fund’s mortgage-backed investments.

incur significant losses. The Fund also runs the risk that deficiencies in the investment adviser’s, subadviser’s, or another service provider’s internal systems or controls will cause losses for the Fund or impair Fund operations.

Valuation Risk The Fund is subject to the risk of mispricing or improper valuation of its investments, in particular to the extent that its securities are fair valued.

Performance Information

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Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Annual Performance

Class I Shares

[MISSING IMAGE: okchnd0pa03pcdl86tagj5tv81ed.jpg]

Highest
Quarter:

2Q ’20,

4.21%

Lowest
Quarter:

3Q ’22,

–3.90%

Average Annual Total Returns

(for the periods ended December 31, 2023)

		One Year			Five Years			Since Inception (02/09/18)
Class I	Return Before Taxes		3.39	%		3.19	%		2.84	%
	Return After Taxes on Distributions		1.73	%		1.18	%		0.99	%
	Return After Taxes on Distributions and Sales of Fund Shares		2.00	%		1.64	%		1.43	%
Bloomberg U.S. 1-5 Year Treasury TIPS Index (reflects no deduction for fees, expenses, or taxes)			4.45	%		3.29	%		2.96	%

MANAGEMENT

Investment Adviser: MML Investment Advisers, LLC (“MML Advisers”)

Subadviser(s): T. Rowe Price Associates, Inc. (“T. Rowe Price”)

Sub-subadviser(s): T. Rowe Price International Ltd (“T. Rowe Price International”)

T. Rowe Price Hong Kong Limited (“T. Rowe Price Hong Kong”)

Portfolio Manager(s):

Michael K. Sewell, CFA is a Vice President and Portfolio Manager at T. Rowe Price. He has managed the Fund since February 2020.

PURCHASE AND SALE OF FUND SHARES

TAX INFORMATION

The Fund intends to make distributions that may be taxed as ordinary income, qualified dividend income, or capital gains, unless you are an investor eligible for preferential tax treatment.

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MassMutual Select T. Rowe Price Real Assets Fund

INVESTMENT OBJECTIVE

The Fund seeks to provide long-term growth of capital.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund.

Shareholder Fees (fees paid directly from your investment)

			Class I
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)			None
Maximum Deferred Sales Charge (Load) (as a % of the lower of the original offering price or redemption proceeds)			None

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

			Class I
Management Fees			0.00%
Distribution and Service (Rule 12b-1) Fees			None
Other Expenses			0.13%
Acquired Fund Fees and Expenses			0.01%
Total Annual Fund Operating Expenses(1)			0.14%
Expense Reimbursement			(0.13%)
Total Annual Fund Operating Expenses after Expense Reimbursement(2)			0.01%

(1)

Because Total Annual Fund Operating Expenses include Acquired Fund Fees and Expenses, they may not correspond to the ratios of expenses to average daily net assets shown in the “Financial Highlights” tables in the Prospectus, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

(2)

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. It assumes that you invest $10,000 in each share class of the Fund

for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment earns a 5% return each year and that the Fund’s operating expenses are exactly as described in the preceding table. 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 I			$1			$32			$66			$166

Portfolio Turnover

INVESTMENTS, RISKS, AND PERFORMANCE

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in “real assets” and securities of companies that derive at least 50% of their profits or revenues from, or commit at least 50% of assets to, real assets and activities related to real assets. The Fund’s subadviser, T. Rowe Price Associates, Inc. (“T. Rowe Price”), currently defines real assets broadly and considers them to include any assets that have physical properties, such as energy and natural resources, real estate, basic materials, equipment, utilities and infrastructure, and commodities. Real assets may produce cash flows and subsequent valuations that increase when the overall price level in the economy is rising. The Fund may also invest in companies whose revenues and earnings are expected to rise if the prices of certain real assets rise during a period of general inflation.

The Fund typically invests most of its assets in common stocks and seeks to hold a portfolio of securities and other investments that, over time, should provide some protection against the impact of inflation.The Fund may use both growth and value approaches in selecting investments, and may

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invest in securities issued by companies of any market capitalization. The Fund is likely to maintain a significant portion of its exposure to the real estate industry through investments in real estate investment trusts (“REITs”), which are pooled investment vehicles that typically invest directly in real estate, in mortgages and loans collateralized by real estate, or in a combination of the two. REITs usually specialize in a particular type of property and may concentrate their investments in particular geographical areas. Investments in REITs may provide the Fund with an efficient means of diversifying among various types of property in different regions. The Fund will normally invest in both U.S. and non-U.S. companies, including companies located in emerging markets, and in securities denominated in both U.S. dollars and foreign currencies. There is no limit on the Fund’s investments in non-U.S. companies. The Fund may (but is not obligated to) use a wide variety of exchange-traded and over-the-counter derivatives, for hedging purposes, to manage inflation risk, to adjust various portfolio characteristics, or as a substitute for direct investments in securities. Such derivatives may include futures contracts, interest rate swaps, total return swaps, and options. The Fund may also, but will not necessarily, engage in foreign currency transactions, including forward contracts, options on currencies, futures contracts, and swap contracts, to seek to hedge or to attempt to protect against adverse changes in currency exchange rates or otherwise to adjust the currency exposures within the Fund’s portfolio. Use of derivatives by the Fund may create investment leverage. The Fund may hold a portion of its assets in cash or cash equivalents.

In selecting securities, T. Rowe Price seeks sectors in equity markets across the globe that are expected to have a low correlation with the overall global equity market in an effort to outperform the market during periods of high or rising inflation. T. Rowe Price invests with an awareness of the global economic backdrop and inflation, as well as its outlook for certain industry sectors and geographic areas. Security selection is based on fundamental, bottom-up analysis that seeks to identify high-quality companies with good appreciation prospects. T. Rowe Price generally favors companies with characteristics such as an attractive industry position, a compelling business model, strong management, and reasonable stock price valuation.

In pursuing the Fund’s investment objective, T. Rowe Price has the discretion to purchase some securities that do not meet its normal investment criteria described above, when it believes there

is an opportunity for substantial appreciation (such as, for example, T. Rowe Price believes a security could increase in value as a result of a change in management, an extraordinary corporate event, a new product introduction or innovation, or a favorable competitive development).

Principal Risks

Real Asset Industry Risk Because the Fund focuses its investments in certain industries that involve activities related to energy, natural resources, real estate, commodities, infrastructure, and other real assets, the Fund is more susceptible to adverse developments affecting one or more of these industries than a Fund that invests more broadly, and may perform poorly during a downturn affecting issuers generally in those industries.

Real Estate Risk; REIT Risk Real estate-related investments may decline in value as a result of factors affecting the real estate industry, such as the supply of real property in certain markets, changes in zoning laws, environmental regulations and other governmental action, delays in completion of construction, changes in real estate values, changes

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in property taxes, levels of occupancy, losses due to natural disasters, and local and regional market conditions. Investments in REITs may be subject to risks similar to those associated with direct investment in real estate, as well as additional risks associated with equity investments. As a shareholder in a REIT, the Fund, and indirectly the Fund’s shareholders, would bear its ratable share of the REIT’s expenses and would at the same time continue to pay its own fees and expenses.

Commodities-Related Investments Risk Commodity prices (including precious metals) can be extremely volatile and exposure to commodities can cause the net asset value of the Fund’s shares to decline or fluctuate in a rapid and unpredictable manner. The values of physical commodities or commodity-linked derivative instruments may be affected by changes in overall market movements, real or perceived inflationary trends, commodity index volatility, changes in interest rates or currency exchange rates, population growth and changing demographics, international economic, political, and regulatory developments, or factors affecting a particular region, industry, or commodity. A liquid secondary market may not exist for certain commodity investments, which may make it difficult for the Fund to sell them at a desirable price or at the price at which it is carrying them.

political, regulatory, public health, and other conditions. Political, social, diplomatic, and economic developments, U.S. and foreign government action, or threat thereof, such as the imposition of currency or capital blockages, controls, or tariffs, economic and trade sanctions or embargoes, security trading suspensions, entering or exiting trade or other intergovernmental agreements, or the expropriation or nationalization of assets in a particular country, can cause dramatic declines in certain or all securities with exposure to that country and other countries. Sanctions, or the threat of sanctions, may cause volatility in regional and global markets and may negatively impact the performance of various sectors and industries, as well as companies in other countries, which could have a negative effect on the performance of the Fund. In the event of nationalization, expropriation, confiscation, or other government action, intervention, or restriction, the Fund could lose its entire investment in a particular foreign issuer or country. There may be quotas or other limits on the ability of the Fund (or clients of the Fund’s investment adviser or subadviser) to invest or maintain investments in securities of issuers in certain countries. Enforcing legal rights can be more difficult, costly, and limited in certain foreign countries and with respect to certain types of investments, and can be particularly difficult against foreign governments. Because non-U.S. securities are normally denominated and traded in currencies other than the U.S. dollar, the value of the Fund’s assets may be affected favorably or unfavorably by changes in currency exchange rates, exchange control regulations, and restrictions or prohibitions on the repatriation of non-U.S. currencies. Income and gains with respect to investments in certain countries may be subject to withholding and other taxes. There may be less information publicly available about a non-U.S. company than about a U.S. company, and many non-U.S. companies are not subject to accounting, auditing, and financial reporting standards, regulatory framework and practices comparable to those in the U.S. The securities of some non-U.S. companies, especially those in emerging markets, are less liquid and at times more volatile than securities of comparable U.S. companies. Emerging markets securities are subject to greater risks than securities issued in developed foreign markets, including less liquidity, less stringent investor protection and disclosure standards, less reliable settlement practices, greater price volatility, higher relative rates of inflation, greater political,

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economic, and social instability, greater custody and operational risks, greater risk of new or inconsistent government treatment of or restrictions on issuers and instruments, and greater volatility in currency exchange rates, and are more susceptible to environmental problems. Many emerging market countries are highly reliant on international trade and exports, including the export of commodities. Their economies may be significantly impacted by fluctuations in commodity prices and the global demand for certain commodities. In addition, pandemics and outbreaks of contagious diseases may exacerbate pre-existing problems in emerging market countries with less established health care systems. Frontier markets, a subset of emerging markets, generally have smaller economies and less mature capital markets than emerging markets. As a result, the risks of investing in emerging market countries are magnified in frontier market countries. Frontier markets are more susceptible to having abrupt changes in currency values, less mature markets and settlement practices, and lower trading volumes that could lead to greater price volatility and illiquidity. Non-U.S. transaction costs, such as brokerage commissions and custody costs, may be higher than in the United States. In addition, foreign markets can react differently to market, economic, industry, political, regulatory, geopolitical, public health, and other conditions than the U.S. market.

product lines, markets, or financial resources and may be dependent on a limited management group; they may have been recently organized and have little or no track record of success.

Liquidity Risk Certain securities may be difficult (or impossible) to sell or certain positions may be

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difficult to close out at a desirable time and price, and the Fund may be required to hold an illiquid investment that is declining in value, or it may be required to sell certain illiquid investments at a price or time that is not advantageous in order to meet redemptions or other cash needs. Some securities may be subject to restrictions on resale. There can be no assurance that there will be a liquid market for instruments held by the Fund at any time. The Fund may not receive the proceeds from the sale of certain investments for an extended period.

Valuation Risk The Fund is subject to the risk of mispricing or improper valuation of its investments, in particular to the extent that its securities are fair valued.

Performance Information

Annual Performance

Class I Shares

[MISSING IMAGE: oejg4cad3lrudvrjfvuc2r2rd8od.jpg]

Highest
Quarter:

2Q ’20,

19.49%

Lowest
Quarter:

1Q ’20,

–27.26%

Average Annual Total Returns

(for the periods ended December 31, 2023)

		One Year			Five Years			Since Inception (02/09/18)
Class I	Return Before Taxes		7.43	%		9.28	%		6.81	%
	Return After Taxes on Distributions		6.77	%		7.92	%		5.58	%
	Return After Taxes on Distributions and Sales of Fund Shares		4.75	%		7.11	%		5.14	%
MSCI ACWI (reflects no deduction for fees or expenses)			22.20	%		11.72	%		8.47	%

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MANAGEMENT

Investment Adviser: MML Investment Advisers, LLC (“MML Advisers”)

Subadviser(s): T. Rowe Price Associates, Inc. (“T. Rowe Price”)

Sub-subadviser(s): T. Rowe Price Australia Limited (“T. Rowe Price Australia”)

Portfolio Manager(s):

Richard A. Coghlan is a Vice President and Portfolio Manager at T. Rowe Price Australia. He has managed the Fund since August 2018.

Christopher Faulkner-MacDonagh is a Portfolio Manager at T. Rowe Price. He has managed the Fund since August 2018.

PURCHASE AND SALE OF FUND SHARES

TAX INFORMATION

The Fund intends to make distributions that may be taxed as ordinary income, qualified dividend income, or capital gains, unless you are an investor eligible for preferential tax treatment.

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MassMutual Select T. Rowe Price Small and Mid Cap Blend Fund

INVESTMENT OBJECTIVE

The Fund seeks long-term capital appreciation by investing primarily in common stocks of small and mid cap companies.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund.

Shareholder Fees (fees paid directly from your investment)

			Class I
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)			None
Maximum Deferred Sales Charge (Load) (as a % of the lower of the original offering price or redemption proceeds)			None

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

			Class I
Management Fees			0.00%
Distribution and Service (Rule 12b-1) Fees			None
Other Expenses			0.06%
Total Annual Fund Operating Expenses			0.06%
Expense Reimbursement			(0.06%)
Total Annual Fund Operating Expenses after Expense Reimbursement(1)			0.00%

(1)

Example

operating expenses are exactly as described in the preceding table. 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 I			$0			$13			$28			$71

Portfolio Turnover

INVESTMENTS, RISKS, AND PERFORMANCE

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of small and mid cap companies. The Fund’s subadviser, T. Rowe Price Associates, Inc. (“T. Rowe Price”), and sub-subadviser, T. Rowe Price Investment Management, Inc. (“T. Rowe Price Investment Management”), currently consider small and mid cap companies to include companies with market capitalizations at the time of purchase that are within the market capitalization range of companies included in either the Russell 2000® Index or the Russell Midcap® Index (as of December 31, 2023, between $16.95 million and $73.32 billion). Equity securities may include common stocks, preferred stocks, securities convertible into common or preferred stock, rights, and warrants.

The Fund typically invests most of its assets in equity securities of U.S. companies, but may invest up to 25% of its total assets in foreign securities and American Depositary Receipts (“ADRs”), including emerging market securities.

The Fund may invest in real estate investment trusts (“REITs”) and exchange-traded funds. The Fund may, to a limited extent, invest in privately held companies and companies that only recently began to trade publicly. The Fund may at times invest

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a substantial portion of its assets in obligations of issuers in one or more market, economic, or industry sectors such as information technology companies. The Fund may (but is not obligated to) use a wide variety of exchange-traded and over-the-counter derivatives, for hedging purposes, to adjust various portfolio characteristics, or as a substitute for direct investments in securities. Such derivatives may include futures contracts, swaps, and options. The Fund may also, but will not necessarily, engage in foreign currency transactions, including forward contracts, options on currencies, futures contracts, and swap contracts, to seek to hedge or to attempt to protect against adverse changes in currency exchange rates or otherwise to adjust the currency exposures within the Fund’s portfolio. Use of derivatives by the Fund may create investment leverage. The Fund may hold a portion of its assets in cash or cash equivalents.

The Fund’s holdings will be widely diversified by industry and issuer. T. Rowe Price and T. Rowe Price Investment Management may employ a growth or value approach in selecting investments. For example, T. Rowe Price or T. Rowe Price Investment Management may seek to identify companies whose price/earnings ratios are attractive relative to the underlying earnings growth rates (e.g., emerging growth companies) and/or companies that appear to be undervalued by various measures and may be temporarily out of favor but have good prospects for capital appreciation.

T. Rowe Price and T. Rowe Price Investment Management generally look for companies with one or more of the following: capable management or plan to improve the business through restructuring; management/employee stock ownership; proven products or services; demonstrated innovative research, product development, and/or marketing; attractive business niches; pricing flexibility; sound financial and accounting practices; a potential or demonstrated ability to grow revenues, earnings, and cash flow consistently; stock price that appears to undervalue growth prospects; low stock price relative to a company’s underlying asset values; above-average dividend yield relative to a company’s peers or a company’s own historical norm; low price/earnings, price/book value, or price/cash flow ratios relative to the Russell 2500 Index, the company’s peers, or its own historical norm; the potential for a catalyst (such as connection to an industry experiencing increasing demand, increased investor

attention, asset sales, strong business prospects, or a change in management) to cause the stock’s price to rise.

In pursuing the Fund’s investment objective, T. Rowe Price and T. Rowe Price Investment Management have the discretion to purchase some securities that do not meet their normal investment criteria described above, when they believe there is an opportunity for substantial appreciation (such as, for example, T. Rowe Price or T. Rowe Price Investment Management believes a security could increase in value as a result of a change in management, an extraordinary corporate event, a new product introduction or innovation, or a favorable competitive development).

T. Rowe Price or T. Rowe Price Investment Management may sell assets for a variety of reasons, including in response to a change in the original investment considerations or to limit losses, adjust the characteristics of the overall portfolio, or redeploy assets into different opportunities.

Principal Risks

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shares can be less liquid than those of larger companies, especially during market declines. Small and medium-sized companies may have limited product lines, markets, or financial resources and may be dependent on a limited management group; they may have been recently organized and have little or no track record of success.

of the Fund (or clients of the Fund’s investment adviser or subadviser) to invest or maintain investments in securities of issuers in certain countries. Enforcing legal rights can be more difficult, costly, and limited in certain foreign countries and with respect to certain types of investments, and can be particularly difficult against foreign governments. Because non-U.S. securities are normally denominated and traded in currencies other than the U.S. dollar, the value of the Fund’s assets may be affected favorably or unfavorably by changes in currency exchange rates, exchange control regulations, and restrictions or prohibitions on the repatriation of non-U.S. currencies. Income and gains with respect to investments in certain countries may be subject to withholding and other taxes. There may be less information publicly available about a non-U.S. company than about a U.S. company, and many non-U.S. companies are not subject to accounting, auditing, and financial reporting standards, regulatory framework and practices comparable to those in the U.S. The securities of some non-U.S. companies, especially those in emerging markets, are less liquid and at times more volatile than securities of comparable U.S. companies. Emerging markets securities are subject to greater risks than securities issued in developed foreign markets, including less liquidity, less stringent investor protection and disclosure standards, less reliable settlement practices, greater price volatility, higher relative rates of inflation, greater political, economic, and social instability, greater custody and operational risks, greater risk of new or inconsistent government treatment of or restrictions on issuers and instruments, and greater volatility in currency exchange rates, and are more susceptible to environmental problems. Many emerging market countries are highly reliant on international trade and exports, including the export of commodities. Their economies may be significantly impacted by fluctuations in commodity prices and the global demand for certain commodities. In addition, pandemics and outbreaks of contagious diseases may exacerbate pre-existing problems in emerging market countries with less established health care systems. Frontier markets, a subset of emerging markets, generally have smaller economies and less mature capital markets than emerging markets. As a result, the risks of investing in emerging market countries are magnified in frontier market countries. Frontier markets are more susceptible to having abrupt changes in currency values, less mature markets and settlement practices, and lower trading volumes

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that could lead to greater price volatility and illiquidity. Non-U.S. transaction costs, such as brokerage commissions and custody costs, may be higher than in the United States. In addition, foreign markets can react differently to market, economic, industry, political, regulatory, geopolitical, public health, and other conditions than the U.S. market.

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Risk of Investment in Other Funds or Pools The Fund is indirectly exposed to all of the risks of the underlying funds, including ETFs, in which it invests, including the risk that the underlying funds will not perform as expected. ETFs are subject to additional risks, including secondary market trading risks and the risk that an ETF’s shares may trade above or below net asset value. The Fund indirectly pays a portion of the expenses incurred by the underlying funds.

Valuation Risk The Fund is subject to the risk of mispricing or improper valuation of its investments, in particular to the extent that its securities are fair valued.

Performance Information

Annual Performance

Class I Shares

[MISSING IMAGE: ca2od4f0bnta4fm0o8i2fqq3ap5j.jpg]

Highest
Quarter:

2Q ’20,

26.81%

Lowest
Quarter:

1Q ’20,

–24.29%

Average Annual Total Returns

(for the periods ended December 31, 2023)

		One Year			Five Years			Since Inception (02/09/18)
Class I	Return Before Taxes		19.07	%		13.16	%		10.43	%
	Return After Taxes on Distributions		17.75	%		11.27	%		8.73	%
	Return After Taxes on Distributions and Sales of Fund Shares		12.02	%		10.29	%		8.07	%
Russell 2500 Index (reflects no deduction for fees, expenses, or taxes)			17.42	%		11.67	%		8.78	%

MANAGEMENT

Investment Adviser: MML Investment Advisers, LLC (“MML Advisers”)

Subadviser(s): T. Rowe Price Associates, Inc. (“T. Rowe Price”)

Sub-subadviser(s): T. Rowe Price Investment Management, Inc. (“T. Rowe Price Investment Management”)

Portfolio Manager(s):

Brian W. H. Berghuis, CFA is a Vice President and Equity Portfolio Manager at T. Rowe Price Investment Management. He has managed the Fund since its inception (February 2018).

Vincent DeAugustino is a Portfolio Manager at T. Rowe Price. He has managed the Fund since June 2022.

Alex Roik, CFA is a Vice President and Associate Portfolio Manager at T. Rowe Price Investment Management. He has managed the Fund since July 2023.

Joshua K. Spencer, CFA is a Vice President, Portfolio Manager, and Research Analyst at T. Rowe Price. He has managed the Fund since March 2019.

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J. David Wagner, CFA is a Vice President and Equity Portfolio Manager at T. Rowe Price Investment Management. He has managed the Fund since its inception (February 2018).

PURCHASE AND SALE OF FUND SHARES

Currently, shares of the Fund are only available to other MassMutual Funds, although, at the discretion of the Trust, shares of the Fund may be offered to a broader range of investors at any

time. Fund shares are redeemable on any business day by written request.

TAX INFORMATION

The Fund intends to make distributions that may be taxed as ordinary income, qualified dividend income, or capital gains, unless you are an investor eligible for preferential tax treatment.

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MassMutual Select T. Rowe Price U.S. Treasury Long-Term Index Fund

INVESTMENT OBJECTIVE

The Fund seeks a high level of income consistent with capital preservation.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund.

Shareholder Fees (fees paid directly from your investment)

			Class I
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)			None
Maximum Deferred Sales Charge (Load) (as a % of the lower of the original offering price or redemption proceeds)			None

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

			Class I
Management Fees			0.00%
Distribution and Service (Rule 12b-1) Fees			None
Other Expenses			0.12%
Total Annual Fund Operating Expenses			0.12%
Expense Reimbursement			(0.12%)
Total Annual Fund Operating Expenses after Expense Reimbursement(1)			0.00%

(1)

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. It assumes that you invest $10,000 in each share class of the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.The example also assumes that your investment earns a 5% return each year and that the Fund’s operating expenses are exactly as described in the

preceding table. 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 I			$0			$26			$56			$142

Portfolio Turnover

INVESTMENTS, RISKS, AND PERFORMANCE

Principal Investment Strategies

The Fund seeks to track the investment returns of its benchmark index, the Bloomberg U.S. Long Treasury Bond Index*.

Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in securities that are held in its benchmark index and at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in U.S. Treasury securities, which are backed by the full faith and credit of the U.S. Government. The Fund’s subadviser, T. Rowe Price Associates, Inc. (“T. Rowe Price”), invests the remainder of the Fund’s assets in other securities backed by the full faith and credit of the U.S. Government and in shares of a T. Rowe Price internal money fund or short-term bond fund that invests exclusively in securities backed by the full faith and credit of the U.S. Government. Securities backed by the full faith and credit of the U.S. Government include, without limitation, securities issued by Government

“Bloomberg®” and Bloomberg U.S. Long Treasury Bond Index are service marks of Bloomberg Finance L.P. and its affiliates, including Bloomberg Index Services Limited (“BISL”), the administrator of the index (collectively, “Bloomberg”) and have been licensed for use for certain purposes by MassMutual. Bloomberg is not affiliated with MassMutual, and Bloomberg does not approve, endorse, review, or recommend the Fund. Bloomberg does not guarantee the timeliness, accuracy, or completeness of any data or information relating to the Fund.

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National Mortgage Association and other government agencies and certain corporate debt securities guaranteed by U.S. Government agencies.

The dollar-weighted average maturity of the Fund’s portfolio will normally exceed 10 years, and it will vary consistent with the dollar-weighted average maturity of the benchmark index.

The Bloomberg U.S. Long Treasury Bond Index is an index consisting of U.S. dollar-denominated, fixed rate nominal debt issued by the U.S. Treasury with maturities of 10 years or more. The Fund does not attempt to fully replicate the index by holding each of the bonds represented in the index. Instead, the Fund seeks to track the returns of the index and more efficiently replicate the key risk factors of the index (such as maturity, duration, and credit quality) by attempting to capitalize on market inefficiencies through structural portfolio positioning and via small tactical bets on inflation, duration, and yield curve positioning.

U.S. Treasury securities in which the Fund may invest include Treasury bills, notes, and bonds (which includes Treasury STRIPS), as well as Treasury inflation protected securities. The Fund buys and sells U.S. Treasury futures, which are futures contracts on U.S. Treasury bonds or notes, and options on such instruments, to gain efficient exposure to U.S. Treasury security prices, help realign the portfolio with the benchmark index, adjust its sensitivity to interest rate changes, and/or manage cash flows into and out of the Fund. Interest rate futures are also used to manage the Fund’s exposure to interest rate changes or to adjust portfolio duration. Use of derivatives by the Fund may create investment leverage.

The Fund may purchase and sell securities on a when-issued, delayed delivery, to-be-announced, or forward commitment basis.

The Fund may sell securities to better align its portfolio with the characteristics of the Bloomberg U.S. Long Treasury Bond Index and will generally seek to sell securities that have been removed from the index within a reasonable timeframe taking into consideration market conditions.

The Fund expects that it will engage in active and frequent trading and so will typically have a relatively high portfolio turnover rate.

Principal Risks

Fixed Income Securities Risk The values of fixed income securities typically will decline during periods of rising interest rates, and can also decline in response to changes in the financial condition of the issuer, borrower, counterparty, or underlying collateral assets, or changes in market, economic, industry, political, regulatory, public health, and other conditions affecting a particular type of security or issuer or fixed income securities generally. Certain events, such as market or economic developments, regulatory or government actions, natural disasters, pandemics, terrorist attacks, war, and other geopolitical events can have a dramatic adverse effect on the debt market and the overall liquidity of the market for fixed income securities. During those periods, the Fund may experience high levels of shareholder redemptions, and may have to sell securities at times when the Fund would otherwise not do so, and potentially at unfavorable prices. Certain securities may be difficult to value during such periods. Fixed income securities are subject to interest rate risk (the risk that the value of a fixed income security will fall when interest rates rise), extension risk (the risk that the average life of a security will be extended through a slowing of principal payments), prepayment risk (the risk that a security will be prepaid and the Fund will be required to reinvest at a less favorable rate), duration risk (the risk that longer-term securities may be more sensitive to interest rate changes), inflation risk (the risk that as inflation increases, the present value of the Fund’s fixed income investment typically will decline), and credit risk.

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otherwise) as unable or unwilling, to make timely principal and/or interest payments, or to otherwise honor its obligations. The Fund may also be exposed to the credit risk of its counterparty to repurchase agreements, reverse repurchase agreements, swap transactions, and other derivatives transactions, and to the counterparty’s ability or willingness to perform in accordance with the terms of the transaction. The value of such transactions to the Fund will depend on the willingness and ability of the counterparty to perform its obligations, including among other things the obligation to return collateral or margin to the Fund. If a counterparty becomes bankrupt or otherwise fails to perform its obligations under a derivative contract due to financial difficulties, the Fund may experience significant delays in obtaining any recovery under the derivative contract in a bankruptcy or other reorganization proceeding. The Fund may obtain only a limited recovery or may obtain no recovery in such circumstances.

Leveraging Risk Instruments and transactions, including derivatives, that create leverage may cause the value of an investment in the Fund to be more volatile, could result in larger losses than if they were not used, and tend to compound the effects of other risks.

Reinvestment Risk Income from the Fund’s portfolio will decline if and when the Fund invests

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the proceeds from matured, traded, or called debt obligations at market interest rates that are below the portfolio’s current earnings rate. A decline in income could affect the Fund’s overall return.

Valuation Risk The Fund is subject to the risk of mispricing or improper valuation of its investments, in particular to the extent that its securities are fair valued.

Performance Information

The following bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance from year to year for Class I shares. The table shows how the Fund’s average annual returns for 1 and 5 years, and since inception, compare with those of a broad measure of market performance. The Fund’s name and investment strategy changed on October 5, 2020. The performance results shown below would not necessarily have been achieved had the Fund’s current investment strategy been in effect for the entire period for which performance results are presented. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Annual Performance

Class I Shares

[MISSING IMAGE: e8ne99d5rr2n7d8uerjg1uhb8tfq.jpg]

Highest
Quarter:

1Q ’20,

20.98%

Lowest
Quarter:

1Q ’21,

–13.70%

Average Annual Total Returns

(for the periods ended December 31, 2023)

		One Year			Five Years			Since Inception (02/09/18)
Class I	Return Before Taxes		1.65	%		-1.84	%		-0.84	%
	Return After Taxes on Distributions		0.28	%		-5.07	%		-3.74	%
	Return After Taxes on Distributions and Sales of Fund Shares		0.95	%		-1.58	%		-0.85	%
Bloomberg U.S. Long Treasury Bond Index (reflects no deduction for fees, expenses, or taxes)			3.06	%		-1.24	%		-0.26	%

MANAGEMENT

Investment Adviser: MML Investment Advisers, LLC (“MML Advisers”)

Subadviser(s): T. Rowe Price Associates, Inc. (“T. Rowe Price”)

Portfolio Manager(s):

Michael K. Sewell, CFA is a Vice President and Portfolio Manager at T. Rowe Price. He has managed the Fund since January 2022.

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PURCHASE AND SALE OF FUND SHARES

TAX INFORMATION

The Fund intends to make distributions that may be taxed as ordinary income, qualified dividend income, or capital gains, unless you are an investor eligible for preferential tax treatment.

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Additional Information Regarding Investment Objectives and Principal Investment Strategies

Changes to Investment Objectives and Strategies.

Each Fund’s investment objective and strategies are non-fundamental and may be changed by the Board of Trustees (the “Trustees”) of the MassMutual Select Funds (the “Trust”) without shareholder approval.

Note Regarding Percentage Limitations.

All percentage limitations on investments in this Prospectus will apply at the time of investment, and will not be considered violated unless an excess or deficiency occurs or exists immediately after and as a result of the investment, except as may be otherwise specified in the Statement of Additional Information (“SAI”). (As a result, the actual investments making up a Fund’s portfolio may not at a particular time comport with any such limitation due to increases or decreases in the values of securities held by the Fund.) However, if, through a change in values, net assets, or other circumstances, a Fund were in a position where more than 15% of its net assets was invested in illiquid securities, the Fund would take appropriate orderly steps, as deemed necessary, to protect liquidity. With respect to a Fund whose name suggests that the Fund focuses its investments in a particular type of investment or investments, or in investments in a particular industry or group of industries, and that has adopted a policy under Rule 35d-1 under the Investment Company Act of 1940, as amended (the “1940 Act”), such Fund’s policy to invest at least 80% of its net assets in certain investments may be changed by the Trustees upon at least 60 days’ prior written notice to shareholders.

Credit Ratings.

Security ratings are determined at the time of investment based on ratings published by nationally recognized statistical rating organizations; if a security is not rated, it will be deemed to have the same rating as a security determined by the investment adviser or subadviser to be of comparable quality. Unless otherwise stated, if a security is rated by more than one nationally recognized statistical rating organization, the highest rating is used. The Fund may retain any security whose rating has been downgraded after purchase.

Duration.

Duration is a measure of the expected life of a debt security that is used to determine the sensitivity of the security’s value to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates. For example, if interest rates rise by 1%, the value of a debt security with a duration of two years would be expected to decline 2% and the value of a debt security with a duration of four years would be expected to decline 4%. Unlike the maturity of a debt security, which measures only the time until final payment is due, duration takes into account the time until all payments of interest and principal on a security are expected to be made, including how these payments are affected by prepayments and by changes in interest rates. Determining duration may involve estimates of future economic parameters, which may vary from actual future values.

Leverage.

Leverage generally has the effect of increasing the amount of loss or gain a Fund might realize, and may increase volatility in the value of a Fund’s investments. Adverse changes in the value or level of the underlying asset, rate, or index may result in a loss substantially greater than the amount invested in the derivative itself.

Temporary Defensive Positions.

At times, a Fund’s investment adviser or subadviser may determine that market conditions make pursuing a Fund’s basic investment strategy inconsistent with the best interests of its shareholders. At such times, the investment adviser or subadviser may (but will not necessarily), without notice, temporarily use alternative strategies primarily designed to reduce fluctuations in the values of a Fund’s assets. In implementing these defensive strategies, a Fund may hold assets without limit in cash and cash equivalents and in other investments that the investment adviser or subadviser believes to be consistent with the Fund’s best interests. If such a temporary defensive strategy is implemented, a Fund may not achieve its investment objective.

Portfolio Turnover.

Changes are made in a Fund’s portfolio whenever the investment adviser or subadviser believes such changes are desirable. Portfolio turnover rates are generally not a factor in making buy and sell

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decisions. A high portfolio turnover rate will result in higher costs from brokerage commissions, dealer-mark-ups, bid-ask spreads, and other transaction costs and may also result in a higher percentage of short-term capital gains and a lower percentage of long-term capital gains as compared to a fund that trades less frequently (short-term capital gains generally receive less favorable tax treatment in the hands of shareholders than do long-term capital gains). Such costs are not reflected in the Funds’ Total Annual Fund Operating Expenses set forth in the fee tables but do have the effect of reducing a Fund’s investment return.

Non-Principal Investments; Use of Derivatives; Securities Loans; Repurchase Agreements.

A Fund may hold investments that are not included in its principal investment strategies. These non-principal investments are described in the SAI or below under “Additional Information Regarding Principal Risks.” A Fund also may choose not to invest in certain securities described in this Prospectus and in the SAI, even though it has the ability to do so. Certain Funds may engage in transactions involving derivatives as part of their principal investment strategies; the disclosures of the principal investment strategies of those Funds include specific references to those derivatives transactions. Any of the other Funds may engage in derivatives transactions not as part of their principal investment strategies, and Funds that may use certain derivatives as part of their principal investment strategies may use other derivatives (not as part of their principal investment strategies), as well. A Fund may use derivatives for hedging purposes, as a substitute for direct investment, to earn additional income, to adjust portfolio characteristics, including duration (interest rate volatility), to gain exposure to securities or markets in which it might not be able to invest directly, to provide asset/liability management, or to take long or short positions on one or more indexes, securities, or foreign currencies. If a Fund takes a short position with respect to a particular index, security, or currency, it will lose money if the index, security, or currency appreciates in value, or an expected credit or other event that might affect the value of the index, security, or currency fails to occur. Losses could be significant. Derivatives transactions may include, but are not limited to, foreign currency exchange transactions, options, futures contracts, interest rate swaps, interest rate futures contracts, forward contracts, total return swaps, credit default swaps,

and hybrid instruments. A Fund may use derivatives to create investment leverage. See “Additional Information Regarding Principal Risks,” below, and the SAI for more information regarding those transactions.

A Fund may make loans of portfolio securities to broker-dealers and other financial intermediaries of up to 33% of its total assets, and may enter into repurchase agreements. These transactions must be fully collateralized at all times, but involve some risk to a Fund if the other party should default on its obligation and the Fund is delayed or prevented from recovering the collateral, or if the Fund is required to return collateral to a borrower at a time when it may realize a loss on the investment of that collateral. Any losses from the investment of cash collateral received by the Fund will be for the Fund’s account and may exceed any income the Fund receives from its securities lending activities. A repurchase agreement is a transaction in which a Fund purchases a security from a seller, subject to the obligation of the seller to repurchase that security from the Fund at a higher price. A Fund may enter into securities loans and repurchase agreements as a non-principal investment strategy.

Foreign Securities.

The globalization and integration of the world economic system and related financial markets have made it increasingly difficult to define issuers geographically. Accordingly, the Funds intend to construe geographic terms such as “foreign,” “non-U.S.,” “European,” “Latin American,” “Asian,” and “emerging markets” in the manner that affords to the Funds the greatest flexibility in seeking to achieve the investment objective(s) of the relevant Fund. Specifically, unless otherwise stated, in circumstances where the investment objective and/or strategy is to invest (a) exclusively in “foreign securities,” “non-U.S. securities,” “European securities,” “Latin American securities,” “Asian securities,” or “emerging markets” (or similar directions) or (b) at least some percentage of the Fund’s assets in foreign securities, etc., the Fund will take the view that a security meets this description so long as the issuer of a security is tied economically to the particular country or geographic region indicated by words of the relevant investment objective and/or strategy (the “Relevant Language”). For these purposes the issuer of a security is deemed to have that tie if:

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(i) the issuer is organized under the laws of the country or a country within the geographic region suggested by the Relevant Language or maintains its principal place of business in that country or region; or

(ii) the securities are traded principally in the country or region suggested by the Relevant Language; or

(iii) the issuer, during its most recent fiscal year, derived at least 50% of its revenues or profits from goods produced or sold, investments made, or services performed in the country or region

suggested by the Relevant Language or has at least 50% of its assets in that country or region.

In addition, the Funds intend to treat derivative securities (e.g., call options) for this purpose by reference to the underlying security. Conversely, if the investment objective and/or strategy of a Fund limits the percentage of assets that may be invested in “foreign securities,” etc. or prohibits such investments altogether, a Fund intends to categorize securities as “foreign,” etc. only if the security possesses all of the attributes described above in clauses (i), (ii), and (iii).

Disclosure of Portfolio Holdings

A description of the Funds’ policies and procedures with respect to the disclosure of each Fund’s portfolio securities is available in the Funds’ SAI.

Additional Information Regarding Principal Risks

A Fund, by itself, generally is not intended to provide a complete investment program. Investment in the Funds is intended to serve as part of a diversified portfolio of investments. An investment in a Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The value of your investment in a Fund changes with the values of the investments in the Fund’s portfolio. Many things can affect those values. Factors that may have an important or significant effect on a particular Fund’s portfolio as a whole are called “Principal Risks.” The Principal Risks of each Fund are identified in the foregoing Fund Summaries and are described in this section. Certain Funds may be more susceptible to some risks than others. Although the Funds strive to reach their stated goals, they cannot offer guaranteed results. The value of your investment in a Fund could go down as well as up. You can lose money by investing in the Funds. References in this section to a Fund’s subadviser may include any sub-subadvisers as applicable.

The SAI contains further information about the Funds, their investments and their related risks.

•

Bank Loans Risk

Many of the risks associated with bank loans are similar to the risks of investing in below investment grade debt securities, although

bank loans are typically (though not always) senior and secured, while below investment grade debt securities or investments are often subordinated and unsecured. Senior loans are subject to the risk that a court could subordinate a senior loan, which typically holds the most senior position in the issuer’s capital structure, to presently existing or future indebtedness or take other action detrimental to the holders of senior loans. Changes in the financial condition of the borrower or economic conditions or other circumstances may reduce the capacity of the borrower to make principal and interest payments on such instruments and may lead to defaults. The value of any collateral securing a bank loan may decline after a Fund invests, and there is a risk that the value of the collateral may not be sufficient to cover the amount owed to the Fund. In addition, collateral securing a loan may be found invalid, may be used to pay other outstanding obligations of the borrower under applicable law, or may be difficult to sell. In the event that a borrower defaults, a Fund’s access to the collateral may be limited by bankruptcy and other insolvency laws. There is also the risk that the collateral may be difficult to liquidate, or that a majority of the collateral may be illiquid. In addition, some loans may be unsecured. Unsecured loans generally present a greater risk of loss to the Fund if the issuer defaults. In some cases, the Fund may rely on a third party to administer its interest in a loan, and so is subject to the risk that the third party will be unwilling or unable to perform its obligations. The Fund may invest in a loan by purchasing an indirect interest in the loan held by a third party. In that case, the Fund will be subject to both the

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credit risk of the borrower and of the third party, and the Fund may be unable to realize some or all of the value of its interest in the loan in the event of the insolvency of the third party. The settlement time for certain loans is longer than the settlement time for many other types of investments, and the Fund may not receive the payment for a loan sold by it until well after the sale; that cash would be unavailable for payment of redemption proceeds or for reinvestment. Interests in some bank loans may not be readily marketable and may be subject to restrictions on resale. In some cases, negotiations involved in disposing of indebtedness may require weeks to complete. Consequently, some indebtedness may be difficult or impossible to dispose of readily at what the Fund believes to be a fair price. Some bank loans may be illiquid, and bank loans generally tend to be less liquid than many other debt securities. The lack of a liquid secondary market may make it more difficult for the Fund to assign a value to such instruments for purposes of valuing the Fund’s portfolio and calculating its net asset value (“NAV”). Some loans may not be considered “securities” for certain purposes under the federal securities laws, and purchasers, such as the Fund, therefore may not be entitled to rely on the anti-fraud protections of the federal securities laws.

•

Below Investment Grade Debt Securities Risk

Below investment grade debt securities, which are also known as “junk” or “high yield” bonds, and comparable unrated securities in which a Fund may invest, have speculative characteristics, and changes in economic conditions, the financial condition of the issuer, and/or an unanticipated rise in interest rates or other circumstances are more likely to lead to a weakened capacity to make principal and interest payment than in the case of higher grade securities. Below investment grade debt securities involve greater volatility of price and yield and greater risk of loss of principal and interest than do higher quality securities. In the past, economic downturns or increases in interest rates have, under certain circumstances, resulted in a higher incidence of default by the issuers of these instruments and are likely to do so in the future, especially in the case of highly leveraged issuers. The prices for these instruments may be affected by

legislative and regulatory developments. Some below investment grade debt securities are issued in connection with management buy-outs and other highly leveraged transactions, and may entail substantial risk of delays in payments of principal or interest or of defaults. The inability (or perceived inability) of issuers to make timely payment of interest and principal would likely make the values of securities held by the Fund more volatile and could limit the Fund’s ability to sell its securities at prices approximating the values the Fund has placed on such securities. In the absence of a liquid trading market for securities held by it, a Fund at times may be unable to establish the fair value of such securities. To the extent a Fund invests in securities in the lower rating categories, the achievement of the Fund’s goals is more dependent on the Fund investment adviser’s or subadviser’s investment analysis than would be the case if the Fund were investing in securities in the higher rating categories. Securities that are rated CCC or below by Standard & Poor’s or Caa or below by Moody’s Investors Service, Inc. are generally regarded by the rating agencies as having extremely poor prospects of ever attaining any real investment standing.

•

Cash Position Risk

A Fund may hold a significant portion of its assets in cash or cash equivalents at the sole discretion of the Fund’s investment adviser or subadviser, based on such factors as it may consider appropriate under the circumstances. The portion of a Fund’s assets invested in cash and cash equivalents may at times exceed 25% of the Fund’s net assets. To the extent a Fund holds a significant portion of its assets in cash or cash equivalents, its investments returns may be adversely affected and the Fund may not achieve its investment objective.

•

Commodities-Related Investments Risk

Commodity prices (including precious metals) can be extremely volatile and exposure to commodities can cause the NAV of the Fund’s shares to decline or fluctuate in a rapid and unpredictable manner. The values of physical commodities or commodity-linked derivative investments may be affected by changes in overall market movements, real or perceived inflationary trends, commodity index volatility,

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changes in interest rates or currency exchange rates, population growth and changing demographics, international economic, political and regulatory developments, or factors affecting a particular region, industry, or commodity, such as drought, floods, weather, embargoes, tariffs, and international economic, political, and regulatory developments. The price of a commodity may be affected by demand/supply imbalances in the market for the commodity. Also, a liquid secondary market may not exist for certain commodity investments, which may make it difficult for the Fund to sell them at a desirable price or the price at which it is carrying them. A Fund’s investments in commodities and commodity-related instruments may bear on or be limited by the Fund’s intention or ability to qualify as a “regulated investment company” for U.S. federal income tax purposes. See “Taxation and Distributions” below.

•

Convertible Securities Risk

Convertible securities are bonds, debentures, notes or other debt securities that may be converted at either a stated price or stated rate into shares of common or preferred stock (or cash or other securities of equivalent value), and so are subject to the risks of investments in both debt securities and equity securities. The price of a convertible security may change in response to changes in price of the underlying equity security, the credit quality of the issuer, and interest rates. Due to the conversion feature, convertible debt securities generally yield less than non-convertible securities of similar credit quality and maturity. The values of convertible securities may be interest-rate sensitive and tend to decline as interest rates rise and to rise when interest rates fall. A Fund may invest at times in securities that have a mandatory conversion feature, pursuant to which the securities convert automatically into stock at a specified date and conversion ratio, or that are convertible at the option of the issuer. When conversion is not at the option of the holder, a Fund may be required to convert the security into the underlying stock even at times when the value of the underlying common stock has declined substantially or it would otherwise be disadvantageous to do so.

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Credit Risk

Credit risk is the risk that an issuer, guarantor, or liquidity provider of a fixed income security held by a Fund may be unable or unwilling, or may be perceived (whether by market participants, ratings agencies, pricing services or otherwise) as unable or unwilling, to make timely principal and/or interest payments, or to otherwise honor its obligations. It includes the risk that the security will be downgraded by a credit rating agency; generally, lower credit quality issuers present higher credit risks. An actual or perceived decline in creditworthiness of an issuer of a fixed income security held by the Fund may result in a decrease in the value of the security. It is possible that the ability of an issuer to meet its obligations will decline substantially during the period when the Fund owns securities of the issuer or that the issuer will default on its obligations or that the obligations of the issuer will be limited or restructured. The credit rating assigned to any particular investment does not necessarily reflect the issuer’s current financial condition and does not reflect an assessment of an investment’s volatility or liquidity. Securities rated in the lowest category of investment grade are considered to have speculative characteristics. In addition, below investment grade debt securities (i.e., “junk” or “high yield” bonds) involve greater credit risk, are more volatile, involve greater risk of price declines and may be more susceptible to economic downturn than investment grade securities. If a security held by the Fund loses its rating or its rating is downgraded, the Fund may nonetheless continue to hold the security in the discretion of the investment adviser or subadviser. In the case of asset-backed or mortgage-related securities, changes in the actual or perceived ability of the obligors on the underlying assets or mortgages may affect the values of those securities.

The Fund may also be exposed to the credit risk of its counterparty to repurchase agreements, reverse repurchase agreements, swap transactions, and other derivatives transactions, and to the counterparty’s ability or willingness to perform in accordance with the terms of the transaction. The value of such transactions to the Fund will depend on the willingness and ability of the counterparty to

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perform its obligations, including among other things the obligation to return collateral or margin to the Fund. If a counterparty becomes bankrupt or otherwise fails to perform its obligations under a derivative contract due to financial difficulties, the Fund may experience significant delays in obtaining any recovery under the derivative contract in a bankruptcy or other reorganization proceeding. The Fund may obtain only a limited recovery or may obtain no recovery in such circumstances. In the event of a counterparty’s (or its affiliate’s) insolvency, the possibility exists that a Fund’s ability to exercise remedies, such as the termination of transactions, netting of obligations, and realization on collateral, could be stayed or eliminated under special resolution regimes adopted in the United States, the European Union, the United Kingdom, and various other jurisdictions. Among other things, such regimes provide government authorities with broad authority to intervene when a financial institution is experiencing financial difficulty.

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Currency Risk

Because foreign securities normally are denominated and traded in foreign currencies, the value of a Fund’s assets may be affected favorably or unfavorably by changes in currency exchange rates, currency exchange control regulations, intervention (or failure to intervene) by the U.S. or foreign governments in currency markets, foreign withholding taxes, and restrictions or prohibitions on the repatriation of foreign currencies. A Fund may, but will not necessarily, engage in foreign currency transactions in order to protect against fluctuations in the values of holdings denominated in or exposed to other currencies, or, for certain Funds, to generate additional returns. Derivatives transactions providing exposure to foreign currencies may create investment leverage. A Fund’s investment in foreign currencies may increase the amount of ordinary income recognized by the Fund.

Officials in foreign countries may from time to time take actions in respect of their currencies which could significantly affect the value of a Fund’s assets denominated in those currencies or the liquidity of such investments. For example, a foreign government may unilaterally devalue its currency against other currencies, which would typically have the

effect of reducing the U.S. dollar value of investments denominated in that currency. A foreign government may also limit the convertibility or repatriation of its currency or assets denominated in its currency, which would adversely affect the U.S. dollar value and liquidity of investments denominated in that currency. In addition, although at times most of a Fund’s income may be received or realized in foreign currencies, the Fund will be required to compute and distribute its income in U.S. dollars. As a result, if the exchange rate for any such currency declines after the Fund’s income has been earned and translated into U.S. dollars but before payment to shareholders, the Fund could be required to sell portfolio investments to make such distributions. Similarly, if a Fund incurs an expense in a foreign currency and the exchange rate changes adversely to the Fund before the expense is paid, the Fund would have to convert a greater amount of U.S. dollars to pay for the expense at that time than it would have had to convert at the time the Fund incurred the expense. Investments in foreign currencies themselves (directly or through derivatives transactions) may be highly volatile and may create investment leverage.

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Cyber Security and Technology Risk

The Funds and their service providers (including the Funds’ investment adviser, subadviser, custodian, and transfer agent) are subject to operational and information security risks, including those resulting from cyber-attacks and other technological issues. Technological issues or failures, or interference or attacks by “hackers” or others, may have the effect of disabling or hindering the Funds’ operations or the operations of a service provider to the Funds. There are inherent limitations in business continuity plans and technology systems designed to prevent cyber-attacks and avoid operational incidents, including the possibility that certain risks have not been identified. The Funds’ investment adviser does not control the cyber security plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Funds’ investment adviser or the Funds, each of whom could be negatively impacted as a result. Any problems relating to the performance and effectiveness of

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security procedures used by a Fund or its service providers to protect a Fund’s assets, such as algorithms, codes, passwords, multiple signature systems, encryption, and telephone call-backs, may have an adverse impact on an investment in a Fund. Similar risks also are present for issuers of securities in which the Funds invest, which could result in material adverse consequences for such issuers, and may cause a Fund’s investment in such securities to lose value. Furthermore, geopolitical tensions may have increased the scale and sophistication of deliberate cyber-attacks, particularly those from nation-states or from entities with nation-state backing.

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Defaulted and Distressed Securities Risk

Defaulted securities risk refers to the uncertainty of repayment of defaulted securities and obligations of distressed issuers. Because the issuer of such securities is in default and is likely to be in distressed financial condition, repayment of defaulted securities and obligations of distressed issuers (including insolvent issuers or issuers in payment or covenant default, in workout or restructuring, or in bankruptcy or insolvency proceedings) is subject to significant uncertainties. The market will likely be less liquid for distressed or defaulted securities than for other types of securities. Reduced liquidity can affect the valuations of distressed or defaulted securities, make their valuation and sale more difficult, and result in greater volatility. Insolvency laws and practices in foreign countries are different than those in the U.S. and the effect of these laws and practices cannot be predicted with certainty. Investments in defaulted securities and obligations of distressed issuers are considered speculative. To the extent a Fund is invested in distressed securities, its ability to achieve current income for its shareholders may be diminished.

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Derivatives Risk

Derivatives are financial contracts whose values depend upon, or are derived from, the value of an underlying asset, reference rate, or index. Derivatives may relate to stocks, bonds, interest rates, currencies, credit exposures, currency exchange rates, commodities, related indexes, or other assets. The use of derivative instruments may involve risks different from, or greater than, the risks

associated with investing directly in securities and other more traditional investments. Derivatives can be highly volatile and are subject to a number of potential risks described in this Prospectus, including market risk, credit risk, management risk, liquidity risk, and leveraging risk. Derivative products are highly specialized instruments that may require investment techniques and risk analyses different from those associated with stocks and bonds. The use of a derivative requires an understanding not only of the underlying instrument or index but also of the derivative itself, often without the benefit of observing the performance of the derivative under all possible market conditions. (For example, successful use of a credit default swap may require, among other things, an understanding of both the credit of the company to which it relates and of the way the swap is likely to respond to changes in various market conditions and to factors specifically affecting the company.) The use of derivatives involves the risk that a loss may be sustained as a result of the failure of another party to the contract (typically referred to as a “counterparty”) to make required payments or otherwise to comply with the contract’s terms. Derivative transactions can create investment leverage. Losses from derivatives can be substantially greater than the derivatives’ original cost and can sometimes be unlimited. Since the values of derivatives are calculated and derived from the values of other assets, reference rates, or indexes, there is greater risk that derivatives will be improperly valued. Derivatives also involve the risk that changes in the value of a derivative may not correlate perfectly with changes in the value of its underlying asset, rate, or index, and the risk that a derivative transaction may not have the effect or benefit the Fund’s investment adviser or subadviser anticipated. Also, suitable derivative transactions may not be available in all circumstances, and there can be no assurance that a Fund will engage in these transactions when that would be beneficial. A liquid secondary market may not always exist for a Fund’s derivative positions at any time. If a derivative transaction is particularly large or if the relevant market is illiquid (as is the case with many privately negotiated derivatives), it may not be possible to initiate a transaction

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or liquidate a position at an advantageous price or at all. Although the use of derivatives is intended to enhance a Fund’s performance, it may instead reduce returns and increase volatility.

U.S. and non-U.S. legislative and regulatory reforms, including those related to the Dodd-Frank Wall Street Reform and Consumer Protection Act, have resulted in, and may in the future result in, significant regulation of derivative instruments and the Funds’ use of such instruments. Such regulations can, among other things, restrict a Fund’s ability to engage in derivative transactions (for example, by making certain types of derivative instruments or transactions no longer available to a Fund), establish additional margin requirements and/or increase the costs of derivatives transactions, and a Fund may as a result be unable to execute its investment strategies in a manner its investment adviser or subadviser might otherwise choose. Counterparty risk with respect to derivatives has been and may continue to be affected by rules and regulations concerning the derivatives market. Some derivatives transactions are centrally cleared, and a party to a cleared derivatives transaction is subject to the credit risk of the clearing house and the clearing member through which it holds the position. Credit risk of market participants with respect to derivatives that are centrally cleared is concentrated in a few clearing houses and clearing members, and it is not clear how an insolvency proceeding of a clearing house or clearing member would be conducted, what effect the insolvency proceeding would have on any recovery by a Fund, and what impact an insolvency of a clearing house or clearing member would have on the financial system more generally.

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Futures Contract Risk. A Fund may enter into futures contracts, in which the Fund agrees to buy or sell certain financial instruments or index units or other assets on a specified future date at a specified price or rate. A Fund may also enter into contracts to deliver in the future an amount of one currency in return for an amount of another currency. If a Fund’s investment adviser or subadviser misjudges the direction of interest rates, markets, or foreign exchange rates, a Fund’s overall performance could suffer. The risk of loss could be far

greater than the investment made because a futures contract requires only a small deposit to take a large position. A small change in a futures contract could have a substantial impact on a Fund, favorable or unfavorable. An investor could also suffer losses if it is unable to close out a futures contract because of an illiquid market. Futures are subject to the creditworthiness of the futures commission merchants or brokers and clearing organizations involved in the transactions. In the event of the insolvency of its futures commission merchant or broker, a Fund may be delayed or prevented from recovering some or all of the margin it has deposited with the merchant or broker, or any increase in the value of its futures positions held through that merchant or broker.

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Dollar Roll Transaction Risk

In a dollar roll transaction, a Fund sells mortgage-backed securities for delivery to the buyer in the current month and simultaneously contracts to purchase similar securities on a specified future date from the same party. These types of transactions generally create leverage (see “Leveraging Risk” below). It may be difficult or impossible for a Fund to exercise its rights under a dollar roll transaction in the event of the insolvency or bankruptcy of the counterparty, and the Fund may not be able to purchase the securities or other assets subject to the transaction and may be required to return any collateral it holds.

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Emerging Markets Risk

Investing in emerging market securities poses risks different from, and/or greater than, risks of investing in domestic securities or in the securities of foreign, developed countries. These risks may include, for example, smaller market-capitalizations of securities markets; significant price volatility; illiquidity; limits on foreign investment; and possible limits on repatriation of investment income and capital. Future economic or political events or crises could lead to price controls, forced mergers, expropriation or confiscatory taxation, seizure, nationalization, or the creation of government monopolies. The currencies of emerging market countries may experience significant declines against the U.S. dollar, and devaluation may occur subsequent to investments in those currencies by a Fund.

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Inflation and rapid fluctuations in inflation rates have had, and may continue to have, negative effects on the economies and securities markets of certain emerging market countries. Although many of the emerging market securities in which a Fund may invest are traded on securities exchanges, they may trade in limited volume, and the exchanges may not provide all of the conveniences or protections provided by securities exchanges in more developed markets.

Additional risks of emerging market securities may include greater social, economic, and political uncertainty and instability; more substantial governmental involvement in the economy; less governmental supervision and regulation; greater custody and operational risks; unavailability of currency hedging techniques; less stringent investor protection and disclosure standards; less reliable settlement practices; companies that are newly organized and small; differences in auditing and financial reporting standards, which may result in unavailability or unreliability of material information about issuers or instruments; less developed legal, regulatory, and accounting systems; and greater environmental risk. Many emerging market countries are highly reliant on international trade and exports, including the export of commodities. Their economies may be significantly impacted by fluctuations in commodity prices and the global demand for certain commodities. In addition, pandemics and outbreaks of contagious diseases may exacerbate pre-existing problems in emerging market countries with less established health care systems. In addition, emerging securities markets may have different clearance and settlement procedures, which may be unable to keep pace with the volume of securities transactions or otherwise make it difficult to engage in such transactions. Settlement of securities transactions in emerging markets may be subject to risk of loss and may be delayed more often than transactions settled in the United States, in part because a Fund will need to use brokers and counterparties that are less well capitalized, and custody and registration of assets in some countries may be unreliable compared to more developed countries. Settlement problems may cause a Fund to miss attractive investment opportunities, hold a portion of its assets in

cash pending settlement, or be delayed in disposing of a portfolio security. It may be more difficult to obtain and/or enforce a judgment in a court outside the U.S., and a judgment against a foreign government may be unenforceable.

Frontier markets, a subset of emerging markets, generally have smaller economies and less mature capital markets than emerging markets. As a result, the risks of investing in emerging market countries are magnified in frontier market countries. Frontier markets are more susceptible to having abrupt changes in currency values, less mature markets and settlement practices, and lower trading volumes that could lead to greater price volatility and illiquidity.

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Equity Securities Risk

Although stocks may have the potential to outperform other asset classes over the long term, their prices tend to fluctuate more dramatically over the shorter term. These movements may result from factors affecting individual companies, or from broader influences like changes in interest rates, market conditions, or investor confidence, or announcements of economic, political, or financial information.

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Fixed Income Securities Risk

The values of debt securities change in response to interest rate changes. In general, as interest rates rise, the value of a debt security is likely to fall. This risk is generally greater for obligations with longer maturities or for debt securities that do not pay current interest (such as zero-coupon securities). Debt securities with variable and floating interest rates can be less sensitive to interest rate changes, although, to the extent a Fund’s income is based on short-term interest rates that fluctuate over short periods of time, income received by the Fund may decrease as a result of a decline in interest rates. The value of a debt security also depends on the issuer’s actual or perceived credit quality or ability to pay principal and interest when due. The value of a debt security is likely to fall if an issuer or the guarantor of a security is unable or unwilling (or is perceived to be unable or unwilling) to make timely principal and/or interest payments or otherwise to honor its obligations or if the debt security’s

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rating is downgraded by a credit rating agency. The value of a debt security can also decline in response to changes in market, economic, industry, political, regulatory, public health, and other conditions that affect a particular type of debt security or issuer or debt securities generally. Certain events, such as market or economic developments, regulatory or government actions, natural disasters, pandemics, terrorist attacks, war, and other geopolitical events can have a dramatic adverse effect on the debt market and the overall liquidity of the market for fixed income securities.

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Extension Risk. During periods of rising interest rates, the average life of certain types of securities may be extended because of slower than expected principal payments. This may lock in a below-market interest rate, increase the security’s duration, and reduce the value of the security.

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Prepayment Risk. Prepayment risk is the risk that principal of a debt obligation will be repaid at a faster rate than anticipated. In such a case, a Fund may lose the benefit of a favorable interest rate for the remainder of the term of the security in question, and may only be able to reinvest the amount of the prepayment at a less favorable rate.

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Interest Rate Risk. The values of bonds and other debt instruments usually rise and fall in response to changes in interest rates. The values of debt instruments generally increase in response to declines in interest rates and decrease in response to rises in interest rates. Interest rates can also change in response to the supply and demand for credit, government and/or central bank monetary policy and action, inflation rates, and other factors. Interest rate risk is generally greater for fixed-rate instruments than floating-rate instruments and for investments with longer durations or maturities. Some investments give the issuer the option to call or redeem an investment before its maturity date. If an issuer calls or redeems an investment during a time of declining interest rates, a Fund might have to reinvest the proceeds in an investment offering a lower yield, and therefore might not benefit from any increase in value as a result of declining interest rates. Negative or very low interest rates could magnify the risks associated

with changes in interest rates. In general, changing interest rates, including rates that fall below zero, could have unpredictable effects on markets and may expose fixed income and related markets to heightened levels of interest rate volatility and liquidity risk. The risks associated with rising interest rates may be particularly acute in the current market environment because the U.S. Federal Reserve Board has been raising interest rates and may continue to do so.

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Foreign Investment Risk

Investments in securities of foreign issuers, securities of companies with significant foreign exposure, and foreign currencies can involve additional risks relating to market, industry, political, regulatory, public health, and other conditions. Political, social, diplomatic, and economic developments, U.S. and foreign government action, or threat thereof, such as the imposition of currency or capital blockages, controls, or tariffs, economic and trade sanctions or embargoes, security trading suspensions, entering or exiting trade or other intergovernmental agreements, or the expropriation or nationalization of assets in a particular country, can cause dramatic declines in certain or all securities with exposure to that country and other countries. Sanctions, or the threat of sanctions, may cause volatility in regional and global markets and may negatively impact the performance of various sectors and industries, as well as companies in other countries, which could have a negative effect on the performance of a Fund. Economic or other sanctions imposed on a foreign country or issuer by the U.S., or on the U.S. by a foreign country, could impair a Fund’s ability to buy, sell, hold, receive, deliver, or otherwise transact in certain securities. In the event of nationalization, expropriation, confiscation, or other government action, intervention, or restriction, a Fund could lose its entire investment in a particular foreign issuer or country. Civil unrest, geopolitical tensions, wars, and acts of terrorism are other potential risks that could adversely affect an investment in a foreign security or in foreign markets or issuers generally. There may be quotas or other limits on the ability of a Fund (or clients of a Fund’s investment adviser or subadviser) to invest or maintain investments in securities of issuers in certain countries.

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Enforcing legal rights can be more difficult, costly, and limited in certain foreign countries and with respect to certain types of investments, and can be particularly difficult against foreign governments. Because non-U.S. securities are normally denominated and traded in currencies other than the U.S. dollar, the value of a Fund’s assets may be affected favorably or unfavorably by changes in currency exchange rates, exchange control regulations, and restrictions or prohibitions on the repatriation of non-U.S. currencies.

Income and gains with respect to investments in certain countries may be subject to withholding and other taxes. There may be less information publicly available about a non-U.S. company than about a U.S. company, and many non-U.S. companies are not subject to accounting, auditing, and financial reporting standards, regulatory framework and practices comparable to those in the United States. The securities of some non-U.S. companies are less liquid and at times more volatile than securities of comparable U.S. companies. Non-U.S. transaction costs, such as brokerage commissions and custody costs may be higher than in the United States. In addition, foreign markets can perform differently from U.S. markets and can react differently to market, economic, industry, political, regulatory, geopolitical, public health, and other conditions than the U.S. market.

The willingness and ability of foreign governmental entities to pay principal and interest on government securities depends on various economic factors, including for example the issuer’s balance of payments, overall debt level, and cash-flow considerations related to the availability of tax or other revenues to satisfy the issuer’s obligations. If a foreign governmental entity defaults on its obligations on the securities, a Fund may have limited recourse available to it. The laws of some foreign countries may limit a Fund’s ability to invest in securities of certain issuers located in those countries. Special tax considerations apply to a Fund’s investments in foreign securities. A Fund’s investments in foreign securities or foreign currencies may increase or accelerate the Fund’s recognition of ordinary income and may affect the amount, timing, or character of the Fund’s distributions.

A Fund may invest in foreign securities known as depositary receipts, in the form of American Depositary Receipts (“ADRs”), European Depositary Receipts (“EDRs”), Global Depositary Receipts (“GDRs”), or other similar securities. An ADR is a U.S. dollar-denominated security issued by a U.S. bank or trust company that represents, and may be converted into, a foreign security. An EDR or a GDR is generally similar but is issued by a non-U.S. bank. Depositary receipts are subject to the same risks as direct investment in foreign securities. Depositary receipts may not necessarily be denominated in the same currency as the underlying securities into which they may be converted, and changes in currency exchange rates may affect the value of an ADR investment in ways different from direct investments in foreign securities. Funds may invest in both sponsored and unsponsored depositary receipts. Unsponsored depositary receipts are organized independently and without the cooperation of the issuer of the underlying securities. As a result, available information concerning the issuers may not be as current for unsponsored depositary receipts and the prices of unsponsored depositary receipts may be more volatile than if such instruments were sponsored by the issuer. In addition, the underlying issuers of certain depositary receipts, particularly unsponsored or unregistered depositary receipts, are under no obligation to distribute shareholder communications to the holders of such receipts or to pass through to them any voting rights with respect to the deposited securities. A Fund may therefore receive less timely information or have less control than if it invested directly in the foreign issuer. An investment in an ADR is subject to the credit risk of the issuer of the ADR.

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Frequent Trading/Portfolio Turnover Risk

The length of time a Fund has held a particular security is not generally a consideration in investment decisions. The investment policies of a Fund may lead to frequent changes in the Fund’s investments, particularly in periods of volatile market movements, in order to take advantage of what the Fund’s investment adviser or subadviser believes to be temporary investment opportunities. A change in the securities held by a Fund is known as “portfolio turnover.”

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Portfolio turnover generally involves some expense to a Fund, including brokerage commissions, bid-asked spreads, dealer mark-ups, and other transaction costs on the sale of securities and reinvestments in other securities, and may result in the realization of taxable capital gains (including short-term gains, which are generally treated as ordinary income when distributed to shareholders). The trading costs and tax effects associated with portfolio turnover may adversely affect a Fund’s performance. Consult your tax adviser regarding the effect of a Fund’s portfolio turnover rate on your investments.

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Geographic Focus Risk

When a Fund invests a relatively large percentage of its assets in issuers located in a single country, a small number of countries, or a particular geographic region, the Fund’s performance could be closely tied to the market, currency, economic, political, or regulatory conditions and developments in those countries or that region, and could be more volatile than the performance of more geographically diversified funds.

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Growth Company Risk

Growth company securities tend to be more volatile in terms of price swings and trading volume than many other types of equity securities. Growth companies, especially technology related companies, have seen dramatic rises and falls in stock valuations. Funds that invest in growth companies are subject to the risk that the market may deem these companies’ stock prices over-valued, which could cause steep and/or volatile price swings. Also, since investors buy these stocks because of their expected superior earnings growth, earnings disappointments often result in sharp price declines.

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Hedging Risk

There can be no assurance that a Fund’s hedging transactions will be effective. If a Fund takes a short position in a particular currency, security, or bond market, it will lose money if the currency, security, or bond market appreciates in value, or an expected credit event fails to occur. Any efforts at buying or selling currencies could result in significant losses for the Fund. Further, foreign currency transactions that are intended to hedge the

currency risk associated with investing in foreign securities and minimize the risk of loss that would result from a decline in the value of the hedged currency may also limit any potential gain that might result should the value of such currency increase.

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Indexing Risk

There are several reasons why an index Fund’s performance may not track the performance of the relevant index. For example, the Fund incurs a number of operating expenses not applicable to the index, and incurs costs in buying and selling securities. A Fund may not be fully invested at times, either as a result of cash flows into the Fund or reserves of cash held by the Fund to meet redemptions. The return on the sample of securities purchased by the investment adviser or subadviser, or futures or other derivative positions taken by the investment adviser or subadviser, to replicate the performance of the index may not correlate precisely with the return on the index. Differences between securities held by a Fund and the securities comprising the index may result from legal restrictions, costs, or liquidity constraints, especially during times when a sampling methodology is used.

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Inflation Risk

The value of assets or income from a Fund’s investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of a Fund’s assets can decline as can the value of the Fund’s distributions. Inflation rates may change frequently and drastically as a result of various factors, including unexpected shifts in the domestic or global economy (or expectations that such policies will change), and a Fund’s investments may not keep pace with inflation, which may result in losses to the Fund’s investors. The market prices of debt securities generally fall as inflation increases because the purchasing power of the future income and repaid principal is expected to be worth less when received by the Fund. Debt securities that pay a fixed rather than variable interest rate are especially vulnerable to inflation risk because variable-rate debt securities may be able to participate, over the long term, in rising interest rates which have historically accompanied long-term inflationary trends.

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Inflation-Linked Securities Risk

Inflation-linked securities are typically fixed income securities whose principal values are periodically adjusted according to a measure of inflation. Inflation rates may change frequently and drastically as a result of various factors, including unexpected shifts in the domestic or global economy (or expectations that such policies will change), and a Fund’s investments may not keep pace with inflation, which may result in losses to the Fund’s investors. If the index measuring inflation falls, the principal value of an inflation-linked security will be adjusted downward, and consequently the interest payable on the security (calculated with respect to a smaller principal amount) will be reduced. Repayment of the original principal of the security upon maturity (as adjusted for inflation) is guaranteed in the case of U.S. Treasury inflation-linked securities. For securities that do not provide a similar guarantee, the adjusted principal value of the security repaid at maturity may be less than the original principal.

Alternatively, the interest rates payable on certain inflation-linked securities may be adjusted according to a measure of inflation. As a result, the principal values of such securities do not adjust according to the rate of inflation, although the interest payable on such securities may decline during times of falling inflation.

The values of inflation-linked securities are expected to change in response to changes in real interest rates. Real interest rates are tied to the relationship between nominal interest rates and the rate of inflation. If nominal interest rates increase at a faster rate than inflation, real interest rates may rise, leading to a decrease in value of inflation-linked securities. Inflation-linked securities may cause a potential cash flow mismatch to investors, because an increase in the principal amount of an inflation-linked security will be treated as interest income currently subject to tax at ordinary income rates even though investors will not receive repayment of principal until maturity. If a Fund invests in such securities, it will be required to distribute such interest income in order to qualify for treatment as a regulated investment company and eliminate the Fund-level tax, without a corresponding receipt of cash, and therefore may be required

to dispose of portfolio securities at a time when it may not be advantageous to do so in order to make such distributions.

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Inflation Protection Risk

During periods of low inflation, the MassMutual Select T. Rowe Price Limited Duration Inflation Focused Bond Fund’s and MassMutual Select T. Rowe Price Real Assets Fund’s attempts to invest in companies that may offer some protection from accelerating inflation could lessen relative returns and cause the Fund to underperform other Funds. Even if the MassMutual Select T. Rowe Price Limited Duration Inflation Focused Bond Fund’s and MassMutual Select T. Rowe Price Real Assets Fund’s investments respond well to changes in long-term inflation rates, they may not respond quickly to short-term changes in inflation rates. Further, a period of high inflation may place other strains on the economy that depress the prices of all stocks, even those of companies that typically benefit from high or rising inflation. Inflation rates may change frequently and drastically as a result of various factors, including unexpected shifts in the domestic or global economy (or expectations that such policies will change), and a Fund’s investments may not keep pace with inflation, which may result in losses to the Fund’s investors.

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Large Company Risk

Large-capitalization stocks as a group could fall out of favor with the market, causing a Fund’s investments in large-capitalization stocks to underperform investments that focus on small- or medium-capitalization stocks. Larger, more established companies may be slow to respond to challenges, including changes to technology or consumer tastes, and may grow more slowly than smaller companies, especially during market cycles corresponding to periods of economic expansion. Market capitalizations of companies change over time.

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Leveraging Risk

The use of leverage has the potential to increase returns to shareholders, but also involves additional risks. A Fund may create leverage by borrowing money (through traditional borrowings or by means of so-called reverse repurchase agreements); certain transactions, including, for example,

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when-issued, delayed-delivery, to-be-announced, and forward commitment purchases, loans of portfolio securities, dollar roll transactions, and the use of some derivatives, can also result in leverage. Leverage will increase the volatility of the Fund’s investment portfolio and could result in larger losses than if it were not used. The use of leverage is considered to be a speculative investment practice and may result in losses to a Fund. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. A Fund will typically pay interest or incur other borrowing costs in connection with leverage transactions.

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LIBOR Transition and Other Reference Benchmarks Risk

The London Interbank Offered Rate (“LIBOR”) was the offered rate for short-term Eurodollar deposits between major international banks. The terms of investments, financings, or other transactions (including certain derivatives transactions) to which the Fund may be a party have historically been tied to LIBOR. In connection with the global transition away from LIBOR led by regulators and market participants, LIBOR was last published on a representative basis at the end of June 2023. Alternative reference rates to LIBOR have been established in most major currencies and the transition to new reference rates continues. Markets in these new rates are developing, but questions around liquidity and how to appropriately mitigate any economic value transfer as a result of the transition remain a concern. The transition away from LIBOR and the use of replacement rates may adversely affect transactions that used LIBOR as a reference rate, financial institutions, funds, and other market participants that engaged in such transactions, and the financial markets generally. The impact of the transition away from LIBOR on the Fund or the financial instruments in which the Fund invests cannot yet be fully determined. In addition, interest rates or other types of rates and indexes which are classed as “benchmarks” have been the subject of ongoing national and international regulatory reform, including under the European Union regulation on indexes used as benchmarks in financial instruments and financial contracts (known as the “Benchmarks Regulation”).

The Benchmarks Regulation has been enacted into United Kingdom law by virtue of the European Union (Withdrawal) Act 2018 (as amended), subject to amendments made by the Benchmarks (Amendment and Transitional Provision) (EU Exit) Regulations 2019 (SI 2019/657) and other statutory instruments. Following the implementation of these reforms, the manner of administration of benchmarks has changed and may further change in the future, with the result that relevant benchmarks may perform differently than in the past, the use of benchmarks that are not compliant with the new standards set by certain supervised entities may be restricted, and certain benchmarks may be eliminated entirely. Additionally, there could be other consequences which cannot be predicted.

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Liquidity Risk

Liquidity risk is the risk that particular investments may be difficult to sell or terminate at approximately the price at which the Fund is carrying the investments. The ability of a Fund to dispose of illiquid positions at advantageous prices may be greatly limited, and a Fund may have to continue to hold such positions during periods when the investment adviser or subadviser otherwise would have sold them. Some securities held by a Fund may be restricted as to resale, may trade in the over-the-counter (“OTC”) market, or may not have an active trading market due to adverse market, economic, industry, political, regulatory, geopolitical, public health, or other conditions, including trading halts, sanctions, or wars. In addition, a Fund, by itself or together with other accounts managed by the investment adviser or subadviser, may hold a position in a security that is large relative to the typical trading volume for that security, which can make it difficult for the Fund to dispose of the position at an advantageous time or price.

Market values for illiquid securities may not be readily available, and there can be no assurance that any fair value assigned to an illiquid security at any time will accurately reflect the price a Fund might receive upon the sale of that security. It is possible that, during periods of extreme market volatility or unusually high and unanticipated levels of redemptions or in the case of a liquidation of

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a Fund, a Fund may be forced to sell large amounts of securities or terminate outstanding transactions at a price or time that is not advantageous in order to meet redemptions or other cash needs or to pay liquidation proceeds. In such a case, the sale proceeds received by a Fund may be substantially less than if the Fund had been able to sell the securities or terminate the transactions in more orderly transactions, and the sale price may be substantially lower than the price previously used by the Fund to value the securities for purposes of determining the Fund’s NAV. To the extent a Fund holds illiquid securities, it may be more likely to pay redemption proceeds in kind.

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Management and Operational Risk

Each Fund is subject to management risk because it relies on the investment adviser’s and/or subadviser’s investment analysis and its selection of investments to achieve its investment objective, and each Fund is subject to the risk that the manager’s assessment of an investment is wrong. A Fund’s investment adviser or subadviser manages the Fund based on its assessment of economic, financial, and market factors and its investment judgment. The investment adviser or subadviser may fail to ascertain properly the appropriate mix of securities for any particular economic cycle. A Fund’s investment adviser or subadviser applies its investment techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that they will produce the intended result. Management risk includes the risk that poor security selection will cause a Fund to underperform relative to other funds with similar investment objectives, or that the timing of movements from one type of security to another could have a negative effect on the overall investment performance of the Fund. There can be no assurance that there will be a liquid market for instruments held by the Fund at any time. The Funds are also subject to operational risks resulting from other services provided by the a Fund’s investment adviser, subadviser, and other service providers, including pricing, administrative, accounting, tax, legal, custody, transfer agency, and other operational services. Examples of such operational risks include the possibility of loss caused by inadequate procedures and controls,

human error, and system failures by a service provider. For example, trading delays or errors could prevent a Fund from benefiting from investment gains or avoiding losses. In addition, a service provider may be unable to provide an NAV for a Fund or share class on a timely basis.

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Market Risk

The values of a Fund’s portfolio securities may decline, at times sharply and unpredictably, as a result of unfavorable broad market developments, which may affect securities markets generally or particular industries, sectors, or issuers. The values of a Fund’s investments may decline as a result of a number of such factors, including actual or perceived changes in general economic and market conditions, industry, political, regulatory, geopolitical, public health, and other developments, including the imposition of tariffs or other protectionist actions, changes in interest rates, currency rates, or other rates of exchange, and changes in economic and competitive industry conditions. Likewise, terrorism, war, natural and environmental disasters, and epidemics or pandemics may be highly disruptive to economies and markets. For example, the global pandemic outbreak of the novel coronavirus known as COVID-19 and efforts to contain its spread produced, and may continue to produce, substantial market volatility, severe market dislocations and liquidity constraints in many markets, exchange trading suspensions and closures, higher default rates, and global business disruption, and they may result in future significant adverse effects. Such factors, and the effects of other infectious illness outbreaks, epidemics, or pandemics, may have a significant adverse effect on a Fund’s performance and have the potential to impair the ability of a Fund’s investment adviser, subadviser, or other service providers to serve the Fund and could lead to disruptions that negatively impact the Fund. Different parts of the market and different types of securities can react differently to these conditions. The possibility that security prices in general will decline over short or even extended periods subjects a Fund to unpredictable declines in the value of its shares, as well as potentially extended periods of poor performance. In

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addition, the increasing popularity of passive index-based investing may have the potential to increase security price correlations and volatility. As passive strategies generally buy or sell securities based simply on inclusion and representation in an index, securities’ prices will have an increasing tendency to rise or fall based on whether money is flowing into or out of passive strategies rather than based on an analysis of the prospects and valuation of individual securities. This may result in increased market volatility as more money is invested through passive strategies.

Federal, state, and other governments, their regulatory agencies, or self-regulatory organizations may take actions that affect the regulation of the securities in which a Fund invests or the issuers of such securities in ways that are unforeseeable. The uncertainty surrounding the sovereign debt of a significant number of European Union countries, as well as the status of the Euro, the European Monetary Union, and the European Union itself, has disrupted and may continue to disrupt markets in the U.S. and around the world. The risks associated with investments in Europe may be heightened due to the United Kingdom’s exit from the European Union on January 31, 2020. An agreement between the United Kingdom and the European Union governing their future trade relationship became effective on January 1, 2021. Significant uncertain