Mark R. Witkowski - 11 Mar 2026 Form 4 Insider Report for Core & Main, Inc. (CNM)

Reporting relationship: Chief Executive Officer, Director
Issuer ticker: CNM
Reported as of: 11 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 13 Mar 2026, 19:24:06 UTC
Prior SEC filing: 11 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Mark Whittenburg, as Attorney-in-Fact for Mark R. Witkowski

Key filing fact

Mark R. Witkowski filed Form 4 for Core & Main, Inc. (CNM) on 13 Mar 2026.

Key facts

This page summarizes Mark R. Witkowski's Form 4 filing for Core & Main, Inc. (CNM).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 13 Mar 2026, 19:24.

Change

Previous filing in this sequence was filed on 11 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001866738 Primary reporting owner

Witkowski Mark R

Relationship: Chief Executive Officer, Director
Address: C/O CORE & MAIN, INC., 1830 CRAIG PARK COURT, ST. LOUIS
Signature: /s/ Mark Whittenburg, as Attorney-in-Fact for Mark R. Witkowski
Signature date: 13 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CNM transaction

Class A Common Stock

Tax liability

Transaction value
Shares: -1,685
Change %: -4.9%
Price: $49.16^*
Shares after: 32,747
Date: 11 Mar 2026
Ownership: Direct
Footnotes: F1

CNM transaction

Class A Common Stock

Award

Transaction value
Shares: +18,372
Change %: +56%
Price: $0.000000^*
Shares after: 51,119
Date: 12 Mar 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

CNM transaction Derivative

Options (Rights to Buy)

Award

Transaction value
Shares: +131,382
Change %
Price: $0.000000^*
Shares after: 131,382
Date: 12 Mar 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 131,382
Exercise price: $47.63
Footnotes: F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

Represents shares withheld by the Issuer for tax withholding purposes upon the vesting of a portion of restricted stock units ("RSUs") granted to the reporting person.

Footnote F2

Represents RSUs granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock of the Issuer. The RSUs vest in three equal annual installments on March 11, 2027, March 11, 2028 and March 11, 2029, subject to the terms of the associated Participant Restricted Stock Unit Agreement.

Footnote F3

The options vest in three equal installments on March 11, 2027, March 11, 2028 and March 11, 2029, subject to the terms of the associated Participant Stock Option Agreement.