Core & Main Executive Chair Stephen LeClair Retires; James Castellano Appointed Chair

Core & Main, Inc. (NYSE:CNM), a leading specialty distributor dedicated to advancing reliable infrastructure with local service, nationwide, today announced changes to its board of directors and executive chair, effective April 1, 2026, as part of the Company's long-term succession planning.

The board appointed M. Susan Hardwick as a director and as a member of the talent and compensation committee. Ms. Hardwick most recently served as chief executive officer of American Water Works Company, Inc. from 2022 to 2025, and previously served as its chief financial officer from 2019 to 2022. She brings to the board of directors extensive executive leadership experience in the regulated utility industry, with a strong background in finance, capital allocation and strategic transactions.

In connection with Ms. Hardwick's appointment, the company undertook additional governance transition actions. Specifically, Stephen LeClair retired from his role as executive chair and chair of the board, and James Castellano, previously the company's lead independent director, was appointed chair of the board. In addition, James Hope was named chair of the audit committee, and Robert Buck was appointed as a member of the audit committee.