X0508 4 2026-03-02 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 2026-03-02 4 F 0 7540 10.12 D 211757 D Reflects the withholding by the issuer of shares having a fair market value equal to the withholding taxes payable by the undersigned at the time the award vested and became payable, such transaction being exempt under Rule 16b-3(e). Includes 17,203 restricted stock units 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 2026-03-04