Strategy. The Fund is a fund of funds that seeks to achieve its investment objective by principally investing in a combination of series of the American Funds Insurance Series (the American Underlying Funds), managed by Capital Research and Management Company (Capital Research), using a flexible asset allocation approach. The Funds investment adviser, MML Investment Advisers, LLC (the Adviser), invests the Funds assets in a combination of U.S. domestic and international American Underlying Funds. As of the date of this Prospectus, it is expected that the American Underlying Funds will include Class 1 shares of the American Funds Insurance Series - Washington Mutual Investors Fund, the American Funds Insurance Series - Growth-Income Fund, the American Insurance Series - Growth Fund, the American … Show more… The Fund is a fund of funds that seeks to achieve its investment objective by principally investing in a combination of series of the American Funds Insurance Series (the American Underlying Funds), managed by Capital Research and Management Company (Capital Research), using a flexible asset allocation approach. The Funds investment adviser, MML Investment Advisers, LLC (the Adviser), invests the Funds assets in a combination of U.S. domestic and international American Underlying Funds. As of the date of this Prospectus, it is expected that the American Underlying Funds will include Class 1 shares of the American Funds Insurance Series - Washington Mutual Investors Fund, the American Funds Insurance Series - Growth-Income Fund, the American Insurance Series - Growth Fund, the American Funds Insurance Series - Global Growth Fund, and the American Funds Insurance Series - The Bond Fund of America. The Adviser allocates the Funds assets among a variety of different asset classes through investing in American Underlying Funds in response to changing market, economic, and investment conditions. Through its investments in American Underlying Funds, the Fund may be exposed to U.S. and foreign equity securities (including both growth and value style equities and equities of any market capitalization), and U.S. and foreign fixed income securities of private or governmental issuers (including fixed income securities of any credit quality (including junk or high yield bonds) and having any maturity or duration). Issuers located outside the United States may include issuers in emerging and developing countries. Equity securities may include common stocks, preferred stocks, securities convertible into common or preferred stock, rights, and warrants. An American Underlying Fund may invest in mortgage-backed or other asset-backed securities and may invest in dollar rolls and to-be-announced (TBA) contracts. The American Underlying Funds may hold a portion of their assets in cash or cash equivalents. The Funds Adviser will rely on proprietary asset allocation models to adjust the amount of the Funds investments in the American Underlying Funds. Exposure to different asset classes and strategies and American Underlying Funds will vary over time, in response to changes in the Advisers assessment of changing market, economic, and political factors and events that the Adviser believes may impact the value of the Funds investments. The Adviser in its absolute discretion may modify the selection of American Underlying Funds from time to time, and may invest in other American Underlying Funds, including any American Underlying Funds that may be created in the future. The amount of the Funds investment in certain investment companies or investment pools is limited by law or by tax considerations. The table below shows the Funds approximate allocation to each of the identified asset classes and each American Underlying Fund as of November 17, 2025. It is possible that the allocations may be different from those shown in the table. Allocations and anticipated investment ranges will change over time. Information regarding the Funds actual allocations to American Underlying Funds is available in the Funds shareholder reports and at https://www.massmutual.com/funds from time to time. A brief description of the American Underlying Funds is included in Appendix F of the Statement of Additional Information (SAI). Asset Class and American Underlying Funds Allocation Equity 65.00% Large Cap Equity American Funds Insurance Series - Washington Mutual Investors Fund 7.50% American Funds Insurance Series - Growth-Income Fund 20.00% American Funds Insurance Series - Growth Fund ??17.50% International/Global American Funds Insurance Series - Global Growth Fund 20.00% Asset Class and American Underlying Funds Allocation Fixed Income 35.00% American Funds Insurance Series - The Bond Fund of America 35.00% Note: Above allocations may not sum up to 100% due to rounding. Show less