# EDGAR Filing Document

**Accession Number:** 0000927972
**File Stem:** 0001104659-23-008763
**Filing Date:** 2023-1
**Character Count:** 35055
**Document Hash:** 2174382d5f6fc7cd0f779564b90b5df1
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-23-008763.hdr.sgml**: 20230131

**ACCESSION NUMBER**: 0001104659-23-008763

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20230131

**DATE AS OF CHANGE**: 20230131

**EFFECTIVENESS DATE**: 20230131

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MASSMUTUAL PREMIER FUNDS
- **CENTRAL INDEX KEY:** 0000927972
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0930

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-82366
- **FILM NUMBER:** 23573585

**BUSINESS ADDRESS:**
- **STREET 1:** 1295 STATE STREET
- **CITY:** SPRINGFIELD
- **STATE:** MA
- **ZIP:** 01111
- **BUSINESS PHONE:** 413-744-1000

**MAIL ADDRESS:**
- **STREET 1:** 1295 STATE STREET
- **CITY:** SPRINGFIELD
- **STATE:** MA
- **ZIP:** 01111

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** DLB FUND GROUP
- **DATE OF NAME CHANGE:** 19940804

## Series and Classes Contracts Data

### MassMutual Inflation-Protected and Income Fund (Series ID: S000003780)

| Class ID   | Class Name           | Ticker Symbol   |
|:---|:---|:---|
| C000010489 | Class A              | MPSAX           |
| C000010490 | Administrative Class | MIPLX           |
| C000010491 | Class R3             | MIPNX           |
| C000010492 | Class R5             | MIPSX           |
| C000010493 | Service Class        | MIPYX           |
| C000098421 | Class I              | MIPZX           |
| C000137071 | Class R4             | MIPRX           |
| C000241048 | Class Y              |  |

![[MISSING IMAGE: lg_massmutualdots-k.jpg]](lg_massmutualdots-k.jpg)

Summary Prospectus February 1, 2023

## MassMutual Funds

#### MassMutual Inflation-Protected and Income Fund
**Ticker:** Class I–MIPZX, Class R5–MIPSX, Service Class–MIPYX, Administrative Class–MIPLX,

Class R4–MIPRX, Class A–MPSAX, Class R3–MIPNX, Class Y–MMODX

Before you invest, you may want to review the Fund's prospectus, which contains more information about the Fund and its risks. You can find the Fund's prospectus and other information about the Fund online at https://www.massmutual.com/funds. You can also get this information at no cost by calling 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.

#### INVESTMENT OBJECTIVE
This Fund seeks to achieve as high a total rate of real return on an annual basis as is considered consistent with prudent investment risk and the preservation 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. You may pay brokerage commissions and other fees to financial intermediaries which are not reflected in the tables and examples below. For Class A shares, you may qualify for sales charge discounts if you invest, or agree to invest in the future, at least $25,000 in MassMutual funds. More information about these and other discounts is available in the section titled *Sales Charges by Class* beginning on page 114 of the Fund's Prospectus or from your financial professional.

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

---

| | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| | **Class I**  | **Class R5**  | **Service <br>Class**  | **Administrative <br>Class**  | **Class R4**  | **Class A**  | **Class R3**  | **Class Y**  |
|  Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)  |  |  |  |  |  | 4.25%  |  |  |
|  Maximum Deferred Sales Charge (Load) (as a % of the lower of the original offering price or redemption proceeds)  |  |  |  |  |  |  |  |  |

---

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

investment)

---

| | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| | **Class I**  | **Class R5**  | **Service <br>Class**  | **Admini- <br>strative Class**  | **Class R4**  | **Class A**  | **Class R3**  | **Class Y**  |
| Management Fees | 0.38%  | 0.38%  | 0.38%  | 0.38%  | 0.38%  | 0.38%  | 0.38%  | 0.38%  |
|  Distribution and Service (Rule 12b-1) Fees  |  |  |  |  | 0.25%  | 0.25%  | 0.50%  |  |
| Other Expenses | 0.09%  | 0.19%  | 0.29%  | 0.39%  | 0.29%  | 0.39%  | 0.29%  | 0.19%<sup>(1)</sup> |
|  **Total Annual Fund Operating Expenses**  | **0.47%**  | **0.57%**  | **0.67%**  | **0.77%**  | **0.92%**  | **1.02%**  | **1.17%**  | **0.57%**  |

---

(1) Other Expenses are based on estimated amounts for the current fiscal year of the Fund.

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#### 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. For Class A shares, the example includes the initial sales charge. 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:

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| | | | | |
|:---|:---|:---|:---|:---|
| | **1 Year**  | **3 Years**  | **5 Years**  | **10 Years**  |
| Class I | $48 | $151 | $263 | $591 |
| Class R5 | $58 | $183 | $318 | $714 |
| Service Class | $68 | $214 | $373 | $835 |
| Administrative Class  | $79 | $246 | $428 | $954 |
| Class R4 | $94 | $293 | $509 | $1131 |
| Class A | $525 | $736 | $964 | $1620 |
| Class R3 | $119 | $372 | $644 | $1420 |
| Class Y | $58 | $183 | $318 | $714 |

---

#### 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 77% 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 inflation-indexed bonds and other income-producing securities. Inflation-indexed bonds are instruments indexed or otherwise linked to general measures of inflation because their principal is typically adjusted to reflect general movements of inflation in the country of issue. The Fund may invest in securities of any maturity. The Fund may invest in inflation-indexed bonds issued by the U.S. and non-U.S. governments or their agencies or instrumentalities, by government-sponsored enterprises, or by corporations. The Fund expects to enter into total

return swaps based on one or more inflation indexes or on inflation-indexed bonds or other inflation derivatives, as a substitute for purchasing certain inflation-indexed bonds or otherwise to adjust the inflation-sensitivity of the portfolio. Use of total return swaps will create leverage in the Fund.

The Fund may also invest in other income-producing securities of any kind (including, but not limited to, corporate bonds and notes, Rule 144A securities, U.S. and non-U.S. government and agency or instrumentality bonds, money market instruments, and mortgage-related and asset-backed securities, including collateralized bond and loan obligations). The Fund may enter into repurchase agreement transactions. The Fund may at times have significant exposure to one or more industries or sectors. The Fund may hold a portion of its assets in cash or cash equivalents. The Fund may invest up to 15% of its total assets in securities that are not denominated in U.S. dollars. The Fund may purchase and sell securities on a when-issued, delayed delivery, to-be-announced, or forward commitment basis.

The Fund may invest in (i) securities denominated in currencies of emerging market countries, (ii) fixed income securities or debt instruments issued by emerging market entities or sovereign nations and/or (iii) debt instruments denominated in or based on the currencies, interest rates, or issues of emerging market countries. Emerging market countries are defined to include any country that did not become a member of the Organization for Economic Cooperation and Development (O.E.C.D.) prior to 1975 and Turkey.

The Fund may invest in other investment companies, including investment companies that are advised by the Fund's investment adviser, subadviser, sub-subadviser, or its affiliates, or by unaffiliated parties.

The Fund generally intends to maintain a dollar-weighted average credit quality of A or better (determined on the basis of the highest credit rating of the Fund's investments at the time of their purchase or, if unrated, determined to be of comparable quality by the Fund's subadviser, *Barings LLC* ("Barings"), or sub-subadviser, *Baring International Investment Limited* ("BIIL")). The Fund will invest primarily in assets rated investment grade at the time of purchase (rated Baa3 or higher by Moody's, BBB- or higher by Standard & Poor's or the equivalent by any nationally recognized statistical rating organization

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("NRSRO"), or, if unrated, determined to be of comparable quality by Barings or BIIL) but not in assets rated below Ba3 by Moody's, below BB- by Standard & Poor's and the equivalent by any NRSRO. In the event that a security is downgraded after its purchase by the Fund, the Fund may continue to hold the security if Barings or BIIL considers that doing so would be consistent with the Fund's investment objective. The Fund invests in a portfolio of securities that Barings or BIIL expects to provide an attractive rate of real return. Barings or BIIL defines "real return" as the portfolio's total return (before expenses) less the estimated rate of inflation, measured using the Consumer Price Index for All Urban Consumers (the "CPI-U").

In addition to the total return swaps and other derivatives referred to above, the Fund may (but is not obligated to) use a wide variety of exchange-traded and over-the-counter derivative transactions, including, but not limited to, total return swaps (for hedging purposes or to adjust various portfolio characteristics, including the duration (interest rate volatility) of the Fund's portfolio, or as a substitute for direct investments), interest rate swaps (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), credit default swaps (for hedging purposes or as a substitute for direct investments), and futures contracts, foreign currency futures and forward contracts, including derivatives thereof (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 or to gain market exposure). The Fund may also enter into forward commitment transactions. The Fund may invest in common stocks, exchange-traded funds ("ETFs"), or other equity securities and derivatives thereof for hedging purposes or to enhance total return. The use of such techniques may have the effect of creating investment leverage in the Fund.

In selecting investments for the Fund, Barings or BIIL seeks to construct a portfolio of inflation-indexed and other income-producing securities and other financial instruments, including derivatives, designed to meet the real return objective of the Fund. Barings or BIIL may choose to sell securities with deteriorating credit or limited upside potential compared to other securities.

#### 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.

***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.

***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

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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.

***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.

***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.

***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. 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

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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. 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.

***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.

***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.

***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 Risk*** Certain instruments in which the Fund may invest rely in some fashion upon the London-Interbank Offered Rate ("LIBOR"). On July 27, 2017, the head of the United Kingdom's Financial Conduct Authority announced a desire to phase out the use of LIBOR by the end of 2021. The administrator of LIBOR ceased publication of most LIBOR settings on a representative basis at the end of 2021 and is expected to cease publication of remaining U.S. dollar LIBOR settings on a representative basis after June 30, 2023. In addition, global regulators have announced that, with limited exceptions, no new LIBOR-based contracts should be entered into after 2021. Actions by regulators have resulted in the establishment of alternative reference rates to LIBOR in most major currencies. Market participants are focused on the transition mechanisms by which the reference rate in existing contracts or instruments may be amended, whether through market wide protocols, fallback contractual provisions, bespoke negotiations or amendments, or otherwise. Markets are developing in response to these new rates, and questions around liquidity in these rates and how to appropriately adjust these rates to eliminate any economic value transfer at the time of transition remain a significant concern for the Fund. Neither the effect of the transition process nor its ultimate

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success can yet be known. The transition process may involve, among other things, increased volatility or illiquidity in markets for instruments that rely on LIBOR. In addition, uncertainty and volatility arising from the transition may result in a reduction in the value of certain LIBOR-based instruments held by the Fund or reduce the effectiveness of related transactions such as hedges. Any such effects of the transition away from LIBOR, as well as other unforeseen effects, could result in losses to the Fund.

***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 Risk*** The Fund relies on the manager's investment analysis and its selection of investments to achieve its investment objective. There can be no assurance that the Fund will achieve the intended results and the Fund may incur significant losses.

***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.

***Repurchase Agreement Risk*** These transactions must be fully collateralized, but involve credit risk

to a Fund if the other party should default on its obligation and the Fund is delayed or prevented from recovering the collateral.

***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.

***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.

***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.

***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.

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#### 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 R5 shares. The table shows how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance. Performance for Class R4 shares of the Fund for periods prior to its inception date (04/01/14) and performance for Class Y shares of the Fund for periods prior to its inception date (02/01/23) is based on the performance of Class R5 shares, adjusted for Class R4 shares to reflect Class R4 expenses. Performance for Class A shares of the Fund reflects any applicable sales charge. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. More up-to-date performance information is available at https://www.massmutual.com/funds or by calling 1-888-309-3539.

#### Annual Performance

#### Class R5 Shares
![[MISSING IMAGE: tf6ff2rpmg2leac3p30109eo5f58.jpg]](tf6ff2rpmg2leac3p30109eo5f58.jpg)

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
| Highest Quarter:  | 2Q '20,  | 6.20%  | Lowest Quarter: | 2Q '13,  | –7.15% |

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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. After-tax returns are shown for Class R5 only. After-tax returns for other classes will vary.

#### Average Annual Total Returns
(for the periods ended December 31, 2022)

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| | | | | |
|:---|:---|:---|:---|:---|
|  |  | **One <br>Year**  | **Five <br>Years**  | **Ten <br>Years**  |
| Class R5  | Return Before <br> Taxes  | -13.42% | 1.80% | 1.00% |
| Class R5  | Return After Taxes on Distributions | -14.71% | 0.09% | -0.41% |
| Class R5  | Return After Taxes on Distributions and sales of Fund Shares | -7.93% | 0.72% | 0.20% |
| Class I | Return Before <br> Taxes | -13.34% | 1.90% | 1.10% |
| Service Class  | Return Before <br> Taxes | -13.49% | 1.69% | 0.90% |
| Administrative <br> Class | Return Before <br> Taxes | -13.59% | 1.59% | 0.80% |
| Class R4 | Return Before <br> Taxes | -13.62% | 1.46% | 0.67% |
| Class A | Return Before <br> Taxes | -17.40% | 0.47% | 0.13% |
| Class R3 | Return Before <br> Taxes | -13.89% | 1.20% | 0.39% |
| Class Y | Return Before <br> Taxes | -13.42% | 1.80% | 1.00% |
| Bloomberg U.S. Treasury <br> Inflation Protected Securities <br> (TIPS) Index (Series – L) <br> (reflects no deduction for fees, <br> expenses, or taxes) | Bloomberg U.S. Treasury <br> Inflation Protected Securities <br> (TIPS) Index (Series – L) <br> (reflects no deduction for fees, <br> expenses, or taxes) | -11.85% | 2.11% | 1.12% |

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#### MANAGEMENT
**Investment Adviser:** MML Investment Advisers, LLC ("MML Advisers")

**Subadviser(s):** Barings LLC ("Barings")

**Sub-subadviser(s):** Baring International Investment Limited ("BIIL")

#### Portfolio Manager(s):
**Yulia Alekseeva, CFA** is a Managing Director, the Head of Securitized Credit Research, and a portfolio manager for Barings' Investment Grade Fixed Income Group. She has managed the Fund since February 2020.

**Douglas Trevallion, II, CFA** is a Managing Director, the Head of Global Securitized Credit, and a portfolio manager for Barings' Investment Grade Fixed Income Group. He has managed the Fund since October 2008.

#### PURCHASE AND SALE OF FUND SHARES
Shares of the Fund are generally available through distribution channels, such as broker-dealers or

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financial institutions, and to retirement plans, other institutional investors, and individual retirement accounts. Fund shares are redeemable on any business day by written request, telephone, or internet (available to certain customers).

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| | |
|:---|:---|
| **Purchase Minimums\*** | **Purchase Minimums\*** |
| | **Class Y**  |
| **Initial Investment** | **$100000**  |
| **Subsequent Investment** | **$250**  |

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\*

The Fund reserves the right to change or waive the investment minimums. For retirement plans, the investment minimum is $250 for each of the initial investment and subsequent investments.

#### 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.

#### PAYMENTS TO BROKER-DEALERS AND OTHER FINANCIAL INTERMEDIARIES
If you purchase the Fund through a broker-dealer or other financial intermediary, the intermediary may receive a one-time or continuing payments from the Fund, MML Advisers or its affiliates, or others for the sale of Fund shares or continuing shareholder services provided by the intermediary. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary to recommend the Fund over another investment. You should contact your intermediary to obtain more information about the compensation it may receive in connection with your investment.

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