Prospectus by Investment Company (Form 497)

MML SERIES INVESTMENT FUND
MML SERIES INVESTMENT FUND II
MML Dynamic Bond Fund
MML Equity Rotation Fund
MML Fundamental Value Fund
MML High Yield Fund
MML Strategic Emerging Markets Fund
Supplement dated March 24, 2025 to the
Prospectuses dated May 1, 2024

This supplement provides new and additional information beyond that contained in the Prospectuses and any previous supplements. It should be retained and read in conjunction with the Prospectuses and any previous supplements.

The Boards of Trustees of the MML Series Investment Fund and MML Series Investment Fund II have approved a Plan of Liquidation and Termination pursuant to which it is expected that each of the MML Dynamic Bond Fund, MML Equity Rotation Fund, MML Fundamental Value Fund, MML High Yield Fund, and MML Strategic Emerging Markets Fund (each a "Fund") will be liquidated and dissolved. The variable products invested in the Funds are separately announcing fund substitutions pursuant to which shares attributable to underlying variable insurance contract holders are expected to be replaced with shares of certain replacement funds, as described in that separate announcement. Effective on or about April 28, 2025 (the "Termination Date"), any remaining shareholders of a Fund, following the fund substitutions, will receive a liquidating distribution equal to the net asset value of the shares they hold on the Termination Date.

Please note that prior to the Termination Date, each Fund may hold most or all of its assets in cash or cash equivalents and therefore may not be able to meet its investment objective.

Effective on and after April 25, 2025, the Funds will not be available for purchase by new investors.

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

L7352-24-12
L8063-24-10​