X0609 4 2026-06-23 0 0001856525 Core & Main, Inc. CNM 0001273233 MAZZARELLA KATHLEEN M false C/O CORE & MAIN, INC. 1830 CRAIG PARK COURT ST. LOUIS MO 63146 1 0 0 0 0 Class A Common Stock 2026-06-23 4 A 0 2799 0 A 16757 D Class A Common Stock 82 I By LLC Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of shareholders to be held in 2027 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer. Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of common units ("Units") of Management Feeder held directly by the reporting person. Pursuant to the Fourth Amended and Restated LLC Agreement of Management Feeder, dated as of February 13, 2024, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for shares of Class A common stock, on a one-for-one basis. /s/ Jackie Burkhardt, as Attorney-in-Fact for Kathleen M. Mazzarella 2026-06-24