Core & Main, Inc. (CNM) Insider Ownership

Historic Insider Ownership Trends

CNM's three largest insider shareholders as of April 22, 2026 are Stephen O Leclair (Executive Chair, 66.14K shares), Stephen O Leclair (Executive Chair, 66.14K shares), Mark R Witkowski (Chief Executive Officer, 51.12K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Stephen O Leclair Executive Chair 66,136 0 11 Mar, 2026
Stephen O Leclair Executive Chair 66,136 0 11 Mar, 2026
Stephen O Leclair Executive Chair 66,136 0 11 Mar, 2026
Mark R Witkowski Chief Executive Officer 51,119 0 13 Mar, 2026
Mark R Witkowski Chief Executive Officer 51,119 0 13 Mar, 2026
Mark R Witkowski Chief Executive Officer 51,119 0 13 Mar, 2026
Bradford A Cowles President 25,491 0 13 Mar, 2026
Bradford A Cowles President 25,491 0 13 Mar, 2026
Bradford A Cowles President 25,491 0 13 Mar, 2026
Michael G. Huebert President 25,337 0 13 Mar, 2026
Michael G. Huebert President 25,337 0 13 Mar, 2026
Michael G. Huebert President 25,337 0 13 Mar, 2026
John R Schaller Executive Vice President 19,689 0 30 May, 2025
John R Schaller Executive Vice President 19,689 0 30 May, 2025
John R Schaller Executive Vice President 19,689 0 30 May, 2025
John Weldon Stephens Chief Accounting Officer 17,374 0 13 Mar, 2026
John Weldon Stephens Chief Accounting Officer 17,374 0 13 Mar, 2026
John Weldon Stephens Chief Accounting Officer 17,374 0 13 Mar, 2026
Bhavani Amirthalingam - 15,156 0 26 Jun, 2025
Orvin T Kimbrough - 13,958 3 21 Jul, 2025
Orvin T Kimbrough - 13,958 3 21 Jul, 2025
Orvin T Kimbrough - 13,958 3 21 Jul, 2025
Margaret Newman - 13,958 0 26 Jun, 2025
Margaret Newman - 13,958 0 26 Jun, 2025
Dennis G Gipson - 13,958 0 26 Jun, 2025
Kathleen M Mazzarella - 13,958 0 26 Jun, 2025
Dennis G Gipson - 13,958 0 26 Jun, 2025
Margaret Newman - 13,958 0 26 Jun, 2025
Dennis G Gipson - 13,958 0 26 Jun, 2025
Kathleen M Mazzarella - 13,958 0 26 Jun, 2025
Carla D Harper Senior Vp, Human Resources 13,874 0 13 Mar, 2026
Carla D Harper Senior Vp, Human Resources 13,874 0 13 Mar, 2026
Carla D Harper Senior Vp, Human Resources 13,874 0 13 Mar, 2026
Robert M Buck - 13,050 0 26 Jun, 2025
Laura K Schneider Chief Human Resources Officer 12,873 0 05 Jun, 2025
Laura K Schneider Chief Human Resources Officer 12,873 0 05 Jun, 2025
Laura K Schneider Chief Human Resources Officer 12,873 0 05 Jun, 2025
Robyn L Bradbury Chief Financial Officer 12,500 0 21 Apr, 2026
Jeffrey D Giles Evp, Corporate Development 9,681 0 13 Mar, 2026
Jeffrey D Giles Evp, Corporate Development 9,681 0 13 Mar, 2026
Jeffrey D Giles Evp, Corporate Development 9,681 0 13 Mar, 2026
Mark G Whittenburg General Counsel And Secretary 8,525 0 13 Mar, 2026
Mark G Whittenburg General Counsel And Secretary 8,525 0 13 Mar, 2026
Mark G Whittenburg General Counsel And Secretary 8,525 0 13 Mar, 2026
James D Hope - 6,939 0 09 Apr, 2026
James G Castellano - 4,638 0 26 Jun, 2025
M Susan Hardwick - 580 0 02 Apr, 2026
M Susan Hardwick - 580 0 02 Apr, 2026
M Susan Hardwick - 580 0 02 Apr, 2026
John R Schaller President 0 553 17 Jul, 2023
John R Schaller President 0 553 17 Jul, 2023
John R Schaller President 0 553 17 Jul, 2023
Robyn L Bradbury Chief Financial Officer 0 22 03 Jul, 2025

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
17 Apr, 2026 Robyn L Bradbury Class A Common Stock A 5,000 $0.00 17,500 D C
17 Apr, 2026 Robyn L Bradbury Class A Common Stock D 1,647 $51.94 15,853 D S
17 Apr, 2026 Robyn L Bradbury Class A Common Stock D 3,353 $52.84 12,500 D S
17 Apr, 2026 Robyn L Bradbury Class B Common Stock and Limited Partnership Interests D 5,000 $0.00 152,447 I J
17 Apr, 2026 Robyn L Bradbury Class B Common Stock and Limited Partnership Interests A 5,000 $0.00 5,000 D J
17 Apr, 2026 Robyn L Bradbury Class B Common Stock and Limited Partnership Interests D 5,000 $0.00 0 D C
07 Apr, 2026 James D Hope Class A Common Stock A 1,972 $50.70 6,939 D P
01 Apr, 2026 M Susan Hardwick Class A Common Stock A 580 $0.00 580 D A
01 Apr, 2026 M Susan Hardwick Class A Common Stock A 580 $0.00 580 D A
01 Apr, 2026 M Susan Hardwick Class A Common Stock A 580 $0.00 580 D A
11 Mar, 2026 John Weldon Stephens Class A Common Stock D 107 $49.16 16,438 D F
11 Mar, 2026 Michael G. Huebert Class A Common Stock D 447 $49.16 14,837 D F
11 Mar, 2026 Mark G Whittenburg Class A Common Stock D 331 $49.16 8,525 D F
12 Mar, 2026 Jeffrey D Giles Class A Common Stock A 3,021 $0.00 9,681 D A
11 Mar, 2026 Mark G Whittenburg Class A Common Stock D 331 $49.16 8,525 D F
11 Mar, 2026 Bradford A Cowles Class A Common Stock D 607 $49.16 18,405 D F
11 Mar, 2026 Carla D Harper Class A Common Stock D 89 $49.16 11,411 D F
11 Mar, 2026 John Weldon Stephens Class A Common Stock D 107 $49.16 16,438 D F
11 Mar, 2026 Carla D Harper Class A Common Stock D 89 $49.16 11,411 D F
11 Mar, 2026 Mark R Witkowski Class A Common Stock D 1,685 $49.16 32,747 D F