# EDGAR Filing Document

**Accession Number:** 0000927972
**File Stem:** 0001104659-23-008762
**Filing Date:** 2023-1
**Character Count:** 16547
**Document Hash:** f5f2d43623200050cc45a797c2a70c11
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-23-008762.hdr.sgml**: 20230131

**ACCESSION NUMBER**: 0001104659-23-008762

**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:** 23573556

**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 U.S. Government Money Market Fund (Series ID: S000003784)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000010511 | Class R5     | MKSXX           |

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

Summary Prospectus February 1, 2023

## MassMutual Funds

#### MassMutual U.S. Government Money Market Fund

#### Ticker: Class R5–MKSXX
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 current income consistent with preservation of capital and liquidity.

#### 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.

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

---

| | |
|:---|:---|
| | **Class R5**  |
| Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price) |  |
|  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 R5**  |
| Management Fees | 0.35%  |
| Distribution and Service (Rule 12b-1) Fees |  |
| Other Expenses | 0.19% |
| **Total Annual Fund Operating Expenses** | **0.54%**  |

---

#### 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 Class R5 shares 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 R5 | $55 | $173 | $302 | $677 |

---

#### INVESTMENTS, RISKS, AND PERFORMANCE

#### Principal Investment Strategies
The Fund normally invests at least 99.5% of its total assets in cash, U.S. Government securities, and/or repurchase agreements fully collateralized by cash or U.S. Government securities.

In managing the Fund, the Fund's subadviser, *Barings LLC* ("Barings"), intends to comply with Rule 2a-7 under the Investment Company Act of 1940, as amended (the "1940 Act"), which sets forth the requirements for money market funds regarding credit quality, diversification, liquidity, and maturity. The Fund seeks to maintain, but does not guarantee, a stable $1.00 share price.

------

Under normal circumstances, the Fund invests at least 80% of its net assets in U.S. Government securities and repurchase agreements that are fully collateralized by U.S. Government securities. U.S. Government securities are high-quality securities issued or guaranteed by the U.S. Treasury or by an agency or instrumentality of the U.S. Government. U.S. Government securities may be backed by the full faith and credit of the U.S. Treasury, the right to borrow from the U.S. Treasury, or the agency or instrumentality issuing or guaranteeing the security. Certain issuers of U.S. Government securities, including Fannie Mae, Freddie Mac, and the Federal Home Loan Banks, are sponsored or chartered by Congress but their securities are neither issued nor guaranteed by the U.S. Treasury.

#### Principal Risks
**You could lose money by investing in the Fund. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The Fund's sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time.** 

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.

***Money Market Instruments Risk*** The value of a money market instrument 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 changes in the financial condition of the issuer or borrower, specific 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 money market instruments.

***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.

***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.

***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.

***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.

***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 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.

***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.

***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 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. The Fund's name, investment objective, and investment strategy changed on May 1, 2016 when the Fund changed from a money market fund to a government money market fund. Performance results shown were achieved when the Fund could invest in types of securities that it is no longer able to hold. Future performance of the Fund may be lower as a result. 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: past-performance.jpg]](past-performance.jpg)

---

| | | | | |
|:---|:---|:---|:---|:---|
| Highest Quarter: | 4Q '22,  | 0.77% | Lowest <br>Quarter: | 1Q '13 thru<br>3Q '14; 1Q '15 thru<br>4Q '16; 2Q '20 thru<br>1Q '22, 0.00% |

---

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

---

| | | | | |
|:---|:---|:---|:---|:---|
|  |  | **One <br>Year**  | **Five <br>Years**  | **Ten <br>Years**  |
| Class R5 | Return Before <br> Taxes | 1.21% | 0.90% | 0.49% |
| FTSE 3 Month US T Bill Index <br> (reflects no deduction for fees, <br> expenses, or taxes) | FTSE 3 Month US T Bill Index <br> (reflects no deduction for fees, <br> expenses, or taxes) | 1.50% | 1.25% | 0.74% |

---

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

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

#### Portfolio Manager(s):
**Adam Cash** is an Associate Director and portfolio manager for Barings' Global Public Fixed Income Trading and Trading Solutions Group. He has managed the Fund since May 2022.

**Scott Simler** is a Director and portfolio manager for Barings' Global Public Fixed Income Trading and Trading Solutions Group. He has managed the Fund since July 2009.

#### PURCHASE AND SALE OF FUND SHARES
Shares of the Fund are generally available 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).

#### 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.

------