X0306 4 2022-03-11 0 0001856525 Core & Main, Inc. CNM 0001659312 LeClair Stephen O C/O CORE & MAIN, INC. 1830 CRAIG PARK COURT ST. LOUIS MO 63146 1 1 0 0 Chief Executive Officer Class A Common Stock 2022-03-11 4 A 0 35742 0.00 A 35742 D Class A Common Stock 1393 I By LLC Options (Rights to Buy) 20.81 2022-03-11 4 A 0 260877 0.00 A 2032-03-10 Class A Common Stock 260877 260877 D Represents restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal annual installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the issuer through each vesting date. Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of common units of Management Feeder (the "Common Units") held by the reporting person. Pursuant to the terms of the Third Amended and Restated LLC Agreement of Management Feeder, dated as of July 22, 2021 (as amended, the "LLC Agreement"), vested Common Units held by the reporting person are redeemable at the discretion of the reporting person for shares of Class B common stock of the Issuer and limited partnership interests of Core & Main Holdings, LP, on a one-for-one basis (together, a "Paired Interest"). The options vest in three equal annual installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the issuer through each vesting date. /s/ Mark Whittenburg, as Attorney-in-Fact for Stephen O. LeClair 2022-03-15