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 1, 2026, the following activity occurred requiring disclosure under Item 408(a) of Regulation S-K.

Robyn L. Bradbury, Chief Financial Officer, adopted a new trading arrangement on January 16, 2026 providing for the sale of up to 35,000 aggregate shares of the Company’s Class A common stock between April 17, 2026 and October 16, 2026.

Bradford A. Cowles, President, adopted a new trading arrangement on January 16, 2026 providing for the sale of up to 100,000 aggregate shares of the Company’s Class A common stock between April 17, 2026 and October 16, 2026.

S.O. LeClair Revocable Trust, DTD 5/12/2023, affiliated with Stephen O. LeClair, Chair of the Board and Executive Chair, adopted a new trading arrangement on January 16, 2026 providing for the sale of up to 800,000 aggregate shares of the Company’s Class A common stock between April 20, 2026 and October 20, 2026.

The Irrevocable Trust FBO D. G. Gipson, affiliated with Dennis G. Gipson, Director, adopted a new trading arrangement on January 16, 2026, providing for the sale of up to 25,000 aggregate shares of the Company’s Class A common stock between April 17, 2026 and October 19, 2026.

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.