X0609 4 2026-03-16 0 0001941365 MasterBrand, Inc. MBC 0001591630 Wanninger Kurt 3300 ENTERPRISE PARKWAY SUITE 300 BEACHWOOD OH 44122 0 1 0 0 EVP & Chief Operations Officer 0 Common Stock, par value $0.01 per share 2026-03-16 4 A 0 39442 0 A 251199 D Represents shares of restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of common stock of MasterBrand, Inc. The RSUs vest in equal one-third increments over three years beginning on February 28, 2027. Includes 56,645 RSUs that have not yet vested, 676 shares held in the issuer's 401(k) plan, and 40,348 shares, the receipt of which has been deferred under the issuer's deferred compensation plan. /s/ Andrean R. Horton, attorney-in-fact for Kurt Wanninger 2026-03-18