Whittenburg Mark G 4

What Happened

• Mark G. Whittenburg, General Counsel and Secretary of Core & Main (CNM), had 331 shares withheld by the company to satisfy tax withholding related to the vesting of restricted stock units. The withholding was recorded at $49.16 per share for a total value of $16,272. This is a routine tax-withholding disposition, not an open-market sale.

Key Details

• Transaction date: 2026-03-11 (reported on Form 4 filed 2026-03-13)
• Action: Shares withheld for tax withholding upon RSU vesting (transaction code F)
• Shares involved: 331 shares withheld at $49.16 per share; total value ~$16,272
• Footnote: F1 — shares were withheld by the issuer for tax withholding on vested RSUs
• Shares owned after transaction: Not provided in the supplied filing excerpt
• Filing timeliness: Filed 2026-03-13 for a 2026-03-11 transaction (appears timely within the usual two-business-day window)

Context

• This was a tax-withholding event (issuer withheld shares to cover taxes on vested restricted stock units), which is administrative and does not necessarily indicate buying or selling intent in the market.
• Such withholding transactions are common when equity awards vest and are treated as dispositions on Form 4 even though the insider did not execute an open-market sale.