Core & Main, Inc.

Director and Officer Trading Arrangements

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 May 4, 2025, the following activity occurred requiring disclosure under Item 408(a) of Regulation S-K.

The James G. Castellano Revocable Trust, affiliated with James G. Castellano, Director, adopted a new trading arrangement on April 18, 2025 providing for the sale of up to 43,994 aggregate shares of the Company’s Class A common stock between July 18, 2025 and January 16, 2026.

Orvin T. Kimbrough, Director, adopted a new trading arrangement on April 18, 2025 providing for the sale of up to 23,962 aggregate shares of the Company’s Class A common stock between July 18, 2025 and January 16, 2026.

Mark R. Witkowski, Chief Executive Officer, adopted a new trading arrangement on April 17, 2025 providing for the sale of up to 200,000 aggregate shares of the Company’s Class A common stock between July 17, 2025 and January 16, 2026.

Robyn L. Bradbury, Chief Financial Officer, adopted a new trading arrangement on April 1, 2025 providing for the sale of up to 30,000 aggregate shares of the Company’s Class A common stock between July 1, 2025 and December 31, 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.