Underwriter: MML Distributors, LLC (MMLD), Member FINRA and SIPC (www.FINRA.org and www.SIPC.org), 1295 State Street, Springfield, MA 01111-0001. Investment advisory services are provided to the Funds by MML Investment Advisers, LLC (MML Advisers). MMLD and MML Advisers are subsidiaries of Massachusetts Mutual Life Insurance Company (MassMutual), Springfield, MA 01111-0001.

This material must be preceded or accompanied by a current prospectus (or summary prospectus, if available) for the applicable MassMutual Funds. Investors should consider a Fund’s investment objective, risks, and charges and expenses carefully before investing. This and other information about the investment company is available in the prospectus (or summary prospectus, if available). Read it carefully before investing.

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The Fund seeks current income exempt from U.S. federal income tax. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in municipal debt securities, the income from which is exempt from U.S. federal income tax. The Fund invests, under normal circumstances, its net assets primarily in municipal debt securities that are, at the time of purchase, rated investment grade by at least one credit rating agency (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). The Fund’s subadviser intends for the Fund’s portfolio dollar-weighted average duration generally to match (within 30%) the average duration of the Bloomberg 5-Year Municipal Bond Index. The Fund’s subadviser is Clinton Investment Management, LLC (Clinton).

The Fund seeks current income exempt from U.S. federal income tax. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in municipal debt securities, the income from which is exempt from U.S. federal income tax. The Fund invests, under normal circumstances, its net assets primarily in municipal debt securities that are, at the time of purchase, rated investment grade by at least one credit rating agency (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). The Fund’s subadviser intends for the Fund’s portfolio dollar-weighted average duration generally to match (within 30%) the average duration of the Bloomberg Municipal Bond Index. The Fund’s subadviser is Clinton Investment Management, LLC (Clinton).

The Fund seeks high current income exempt from U.S. federal income tax. The Fund’s secondary investment objective is total return. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in municipal debt securities, the income from which is exempt from U.S. federal income tax. The Fund invests, under normal circumstances, at least 35% of its net assets in municipal debt securities that are, at the time of purchase, rated by at least one credit rating agency as follows: rated Baa or lower by Moody’s, BBB or lower by Standard & Poor’s, or the equivalent by any other nationally recognized statistical rating organization (using the lower rating), or, if unrated, determined to be of comparable quality by the Fund’s subadviser. The Fund may invest up to 45% of its net assets in municipal debt securities rated below investment grade (e.g., below Baa3 by Moody’s or below BBB- by Standard & Poor’s), which are commonly referred to as “junk” or “high yield” bonds. The Fund's subadviser intends for the Fund's portfolio dollar-weighted average duration generally to match (within 30%) the average duration of the Bloomberg Municipal 65% High Grade/35% High Yield Index. The Fund’s subadviser is Clinton Investment Management, LLC (Clinton).

This Fund seeks a high level of current income with preservation of capital as a secondary goal. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in income-producing floating rate debt securities, consisting of floating rate loans, bonds, and notes, issued primarily by North American and Western European companies. The Fund’s subadviser is Barings LLC (Barings). In addition, Baring International Investment Limited serves as a sub-subadviser for the Fund.

This Fund seeks an absolute return, primarily through current income and secondarily through capital appreciation. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in debt instruments (consisting of loans, bonds, and notes). The Fund may invest in a wide range of debt instruments of issuers based in U.S. and non-U.S. markets, including emerging markets, as well as over-the-counter and exchange-traded derivatives. The Fund’s subadviser is Barings LLC (Barings). In addition, Baring International Investment Limited serves as a sub-subadviser for the Fund.

This Fund seeks to achieve maximum total return, consistent with preservation of capital and prudent investment management, through high current income generation and, where appropriate, capital appreciation. The Fund invests in debt securities, derivatives, and other instruments that are economically tied to emerging market countries or countries with relatively low gross national product per capita and with the potential for rapid economic growth. Under normal circumstances, the Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in (i) securities denominated in currencies of the 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. The Fund focuses its investments in Asia, Africa, the Middle East, Latin America, and the developing countries of Europe. The Fund’s subadviser is Barings LLC (Barings). In addition, Baring International Investment Limited serves as a sub-subadviser for the Fund.