X0306 4 2022-12-15 0001941365 MasterBrand, Inc. MBC 0001661135 Horton Andrean ONE MASTERBRAND CABINETS DRIVE JASPER IN 47546 true EVP, CLO & Secretary Common Stock, par value $0.01 per share 2022-12-15 4 A 0 95178 0 A 95178 D In connection with the separation of the Issuer from Fortune Brands Home & Security, Inc., effective December 14, 2022, the Reporting Person was granted 95,178 Issuer RSUs that vest 50% on December 15, 2024 and 50% on December 15, 2025, subject to the Reporting Person's continued employment with the Issuer. Each Issuer RSU represents a contingent right to receive one share of Common Stock. /s/ Andrean Horton 2022-12-19