X0609 4 2026-06-01 0001941365 MasterBrand, Inc. MBC 0001660085 Banyard R David false 3300 ENTERPRISE PARKWAY SUITE 300 BEACHWOOD OH 44122 true true false false CEO & President false Common Stock, par value $0.01 per share 2026-06-01 4 P false 60000 8.43 A 1831788 D The shares were purchased in multiple transactions at prices ranging from $8.33 to $8.49 per share. The price reported reflects the volume weighted average price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased at each separate price. Includes 576,339 restricted stock units that have not yet vested and 446,819 shares, the receipt of which has been deferred under the issuer's deferred compensation plan. /s/ Andrean R. Horton, attorney-in-fact for R. David Banyard, Jr. 2026-06-02