Core & Main, Inc.

Item 408(a) of Regulation S-K requires the Company to disclose whether any of its directors or officers have adopted orterminated (i) any trading arrangement that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c); and/or (ii) any written trading arrangement that meets the requirements of a “non-Rule 10b5-1 trading arrangement” as defined in Item 408(c) of Regulation S-K. During the quarter ended February 2, 2025, the following activity occurred requiring disclosure under Item 408(a) of Regulation S-K.

Laura K. Schneider, Chief Human Resources Officer, adopted a new trading arrangement on January 3, 2025 providing for the sale of up to 195,695 aggregate shares of the Company’s Class A common stock between April 14, 2025 and October 14, 2025.

The Jeffrey D. Giles Revocable Trust dated May 18, 2022, affiliated with Jeffrey D. Giles, EVP Corporate Development, adopted a new trading arrangement on December 31, 2024 providing for the sale of up to 40,000 aggregate shares of the Company’s Class A common stock between April 4, 2025 and October 3, 2025.

John W. Stephens, Vice President, Corporate Controller, adopted a new trading arrangement on December 18, 2024 providing for the sale of up to 83,927 aggregate shares of the Company’s Class A common stock between March 20, 2025 and September 19, 2025.

Each of the above trading arrangements is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act and the Company’s Policy on Trading in Securities.