Mark R. Witkowski

Companies

• Core & MainBoard member Apr 2, 2025 to now¹
• Core & MainChief executive officer Apr 2, 2025 to now¹
• Core & MainChief financial officer Jul 23, 2021 to Apr 2, 2025²

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• Core & Main CNM51,119 shares³$2.1M at $41.99Mar 12, 2026

As of each latest filing. The line shows shares held over time.

Recent filings

• Mar 12, 2026Granted 18,372 shares of Core & Main³
• Mar 11, 2026Shares withheld for tax 1,685 shares at $49.16 of Core & Main³
• Mar 10, 2026Shares withheld for tax 937 shares at $49.38 of Core & Main⁴
• Mar 9, 2026Shares withheld for tax 478 shares at $49.96 of Core & Main⁴
• Aug 18, 2025Sold 100,000 shares at $64.08 of Core & Main⁵
• Aug 18, 2025Converted 100,000 shares of Core & Main⁵
• Jul 17, 2025Sold 27,669 shares at $61.63 of Core & Main⁶
• Jul 17, 2025Sold 72,331 shares at $61.12 of Core & Main⁶
• Jul 17, 2025Converted 100,000 shares of Core & Main⁶
• Mar 31, 2025Granted 10,092 shares of Core & Main⁷
• Mar 13, 2025Granted 7,296 shares of Core & Main⁸
• Mar 11, 2025Shares withheld for tax 925 shares at $46.55 of Core & Main⁹
• Mar 10, 2025Shares withheld for tax 996 shares at $46.69 of Core & Main¹⁰
• Mar 7, 2025Shares withheld for tax 536 shares at $47.87 of Core & Main¹⁰
• May 8, 2024Sold 50,000 shares at $59.50 of Core & Main¹¹
• May 8, 2024Converted 50,000 shares of Core & Main¹¹
• Apr 8, 2024Sold 50,000 shares at $58.51 of Core & Main¹²
• Apr 8, 2024Converted 50,000 shares of Core & Main¹²
• Mar 11, 2024Shares withheld for tax 929 shares at $48.29 of Core & Main¹³
• Mar 11, 2024Shares withheld for tax 999 shares at $48.29 of Core & Main¹³
• Mar 7, 2024Granted 4,677 shares of Core & Main¹⁴
• Nov 15, 2023Sold 40,000 shares at $34.01 of Core & Main¹⁵
• Nov 15, 2023Converted 40,000 shares of Core & Main¹⁵
• Nov 9, 2023Sold 20,000 shares at $32.10 of Core & Main¹⁶
• Nov 9, 2023Converted 20,000 shares of Core & Main¹⁶