Form 4 for CNM Core & Main, Inc.

Accepted 2026-03-13 00:00:00 ET · period of report 2026-03-11 · accession 0001856525-26-000023 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
D	2026-03-13	2026-03-11	CNM	Witkowski Mark R	CEO, Dir	F - Tax	$49.16	-1,685	32.7K	-5%	-$82.8K
D	2026-03-13	2026-03-12	CNM	Witkowski Mark R	CEO, Dir	A - Grant	$0.00	+18.4K	51.1K	+56%	$0
D	2026-03-13	2026-03-12	CNM	Witkowski Mark R	CEO, Dir	A - Grant	$0.00	+131.4K	131.4K	New	$0

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Class A Common Stock	2026-03-11	F	D	1,685	$49.16	32,747	D	—	—	(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.
2	Common	Class A Common Stock	2026-03-12	A	A	18,372	$0.00	51,119	D	—	—	(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.
3	Derivative	Options (Rights to Buy)	2026-03-12	A	A	131,382	$0.00	131,382	D	$47.63 · — to 2036-03-12	131,382 Class A Common Stock	(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.