Massmutual Premier Funds N-CSRSCertified semi-annual shareholder report (management investment company)

The Fund seeks current income consistent with preservation of capital and liquidity. 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. 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. The Fund’s subadviser is Barings LLC (Barings). The Fund seeks to maintain, but does not guarantee, a stable $1.00 share price. 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 is not required to reimburse the Fund for losses, and you should not expect that the sponsor will provide financial support to the Fund at any time, including during periods of market stress.

The Fund seeks to achieve a high total rate of return primarily from current income while minimizing fluctuations in capital values by investing primarily in a diversified portfolio of short-term investment grade fixed income securities. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in investment grade fixed income securities (rated Baa3 or higher by Moody’s, BBB- or higher by Standard & Poor’s or the equivalent by any nationally recognized statistical rating organization, or, if unrated, determined to be of comparable quality by the Fund’s subadviser or sub-subadviser). The Fund’s subadviser is Barings LLC (Barings). In addition, Baring International Investment Limited serves as a sub-subadviser for the Fund.

The 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 by investing, under normal circumstances, 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. The Fund’s subadviser is Barings LLC (Barings). In addition, Baring International Investment Limited serves as a sub-subadviser for the Fund.

The Fund seeks to achieve a high total rate of return consistent with prudent investment risk and the preservation of capital by investing primarily in a diversified portfolio of investment grade fixed income securities. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in investment grade fixed income securities (rated Baa3 or higher by Moody’s, BBB- or higher by Standard & Poor’s or the equivalent by any other nationally recognized statistical rating organization, or, if unrated, determined to be of comparable quality by the Fund’s subadviser or sub-subadviser). The Fund’s portfolio dollar-weighted average duration generally matches (within 10%) the average duration of the Bloomberg U.S. Aggregate Bond Index. The Fund’s subadviser is Barings LLC (Barings). In addition, Baring International Investment Limited serves as a sub-subadviser for the Fund.

The Fund seeks a superior total rate of return by investing in fixed income instruments. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in fixed income securities. The Fund’s subadviser is Barings LLC (Barings). In addition, Baring International Investment Limited serves as a sub-subadviser for the Fund.

The Fund seeks to achieve a high level of total return, with an emphasis on current income, by investing primarily in high yield debt and related securities. The Fund invests primarily in lower rated U.S. debt securities (“junk” or “high yield” bonds), including securities in default. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in lower rated fixed income securities (rated below Baa3 by Moody’s, below BBB- by Standard & Poor’s or the equivalent by any nationally recognized statistical rating organization (using the lower rating) or, if unrated, determined to be of below investment grade quality by the Fund’s subadviser or sub-subadviser). The Fund’s subadviser is Barings LLC (Barings). In addition, Baring International Investment Limited serves as a sub-subadviser for the Fund.

The Fund seeks a high total return by investing across different asset classes (U.S. equity securities and fixed income securities) each represented by a different segment of the Fund’s portfolio. Under normal market conditions, the Fund’s subadviser and sub-subadviser expect that 55%-75% of the Fund’s net assets will be invested in U.S. equity securities (the “U.S. Equity Segment”) and 25%-45% of the Fund’s net assets will be invested in fixed income securities (the “Bond Segment”) that meet certain environmental, social, and governance (“ESG”) criteria. The Fund will target a long term strategic allocation of 65% to the U.S. Equity Segment and 35% to the Bond Segment. The Fund’s subadviser is Invesco Advisers, Inc., and its sub-subadviser is Invesco Capital Management LLC (together with Invesco Advisers, Inc., “Invesco”).

The Fund seeks long-term total return by investing primarily in equity securities of U.S. large- and mid-cap companies. The Fund currently invests substantially all of its assets in companies represented in the Russell 1000^® Value Index at the time of purchase, although the Fund is actively managed and is not an index fund or a passively managed investment. Constituents of the Russell 1000 Value Index are companies that exhibit certain value characteristics, as defined by the index providers, such as lower price-to-book ratios, lower prices relative to forecasted earnings, and higher dividend yields. The Fund’s subadviser is Wellington Management Company LLP (Wellington Management).

The Fund seeks a high total return by investing primarily in common stocks of U.S. companies of different capitalization ranges. The Fund’s subadviser currently focuses on “large capitalization” issuers, which are considered to be companies with market capitalizations at the time of purchase within the market capitalization range of companies included within the Russell 1000^® Index, although it may purchase stocks of companies with any market capitalization. The Fund’s subadviser is Invesco Advisers, Inc. (Invesco Advisers).

The Board of Trustees of the MassMutual Premier Funds has approved a Plan of Liquidation and Termination pursuant to which it is expected that the MassMutual Main Street Fund (the “Fund”) will be dissolved. Effective on or about August 23, 2024 (the “Termination Date”), shareholders of the various classes of shares of the Fund will receive proceeds in proportion to the number of shares of such class held by each of them on the Termination Date. 

The Fund seeks long-term total return by investing primarily in equity securities of U.S. large- and mid-cap companies. The Fund currently invests substantially all of its assets in companies represented in the Russell 1000^® Growth Index at the time of purchase, although the Fund is actively managed and is not an index fund or a passively managed investment. Constituents of the Russell 1000 Growth Index are companies that exhibit certain growth characteristics, as defined by the index providers, such as historical and predicted future earnings per share growth rates and trends, historical sales per share growth trends, and internal growth rate. The Fund’s subadviser is Wellington Management Company LLP (Wellington Management).

The Fund seeks capital appreciation by investing primarily in common stocks of small-capitalization U.S. companies that the Fund’s subadviser believes have favorable business trends or prospects based on fundamental analysis. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in securities of small-cap companies. The Fund’s subadviser is Invesco Advisers, Inc. (Invesco Advisers).

The Fund seeks long-term capital appreciation by investing primarily in common stocks of companies in the U.S. and foreign countries. The Fund can invest without limit in foreign securities, including American Depositary Receipts (ADRs), and can invest in any country, including developing or emerging market countries. However, the Fund currently emphasizes investments in developed markets such as the United States, Western European countries, and Japan. As a fundamental policy, the Fund normally will invest in at least three countries (one of which may be the United States). Typically, the Fund invests in a number of different countries. The Fund’s subadviser is Invesco Advisers, Inc. (Invesco Advisers).

The Fund seeks to achieve long-term capital appreciation by investing primarily in common stock of foreign companies. The Fund invests primarily in the common stock of companies that are domiciled or that have their primary operations outside of the United States. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in securities of foreign companies. The Fund may invest up to 100% of its total assets in such securities. The Fund may invest in emerging markets as well as in developed markets throughout the world. From time to time, the Fund may place greater emphasis on investing in one or more particular regions (such as Asia, Europe, or Latin America). The Fund’s subadvisers are Wellington Management Company LLP (Wellington Management), which managed approximately 74% of the Fund’s portfolio; and Thompson, Siegel & Walmsley LLC (TSW), which was responsible for approximately 26% of the Fund’s portfolio, as of March 31, 2024.

The Fund seeks long-term capital growth by investing mainly in common stocks of issuers in developing and emerging markets throughout the world and at times may invest up to 100% of its total assets in foreign securities. Under normal market conditions, the Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of issuers whose principal activities are in a developing (or emerging) market, i.e., are in a developing market or are economically tied to a developing market country. The Fund will invest in at least three developing markets. In general, countries may be considered developing or emerging markets if they are included in any one of the MSCI emerging markets indexes, classified as a developing or emerging market, or classified under a similar or corresponding classification, by organizations such as the World Bank and the International Monetary Fund, or have economies, industries, and stock markets with similar characteristics. The Fund’s subadviser is Invesco Advisers, Inc. (Invesco Advisers).