X0609 4 2026-06-03 0 0001941365 MasterBrand, Inc. MBC 0001699417 Crisci Robert false 3300 ENTERPRISE PARKWAY SUITE 300 BEACHWOOD OH 44122 1 0 0 0 0 Common Stock, par value $0.01 per share 2026-06-03 4 A 0 18824 0 A 98328 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 on June 3, 2027. Includes a total of 31,893 RSUs that have not vested. /s/ Andrean R. Horton, attorney-in-fact for Robert C. Crisci 2026-06-05