Core & Main, Inc. (CNM) has 20 known insider and institutional holders on record. The largest holder is CD&R Investment Associates X, Ltd. with 26,969,558 shares. Other notable holders include LeClair Stephen O and Witkowski Mark R.
Over the last 12 months, insiders have made 62 transactions in CNM stock — 19 buys (valued at $318.36K) and 4 sells (valued at $11.04M). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
CNM Insider Ownership
Top Holder
CD&R Investment Associates X, Ltd.
26,969,558 shares
Buys (12 mo)
19
$318.36K value
Sells (12 mo)
4
$11.04M value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Cd&r Investment Associates X, Ltd. |
10 Percent Owner |
26,969,558 |
2023-11-15 |
|
| 2 |
Leclair Stephen O |
Executive Chair |
69,217 |
2026-03-11 |
|
| 3 |
Witkowski Mark R |
Chief Executive Officer |
32,747 |
2026-03-13 |
|
| 4 |
Schaller John R |
Executive Vice President |
19,588 |
2025-05-30 |
|
| 5 |
Cowles Bradford A |
President |
18,405 |
2026-03-13 |
|
| 6 |
Stephens John Weldon |
Chief Accounting Officer |
16,438 |
2026-03-13 |
|
| 7 |
Amirthalingam Bhavani |
Director |
15,156 |
2025-06-26 |
|
| 8 |
Huebert Michael G. |
President |
14,837 |
2026-03-13 |
|
| 9 |
Mazzarella Kathleen M |
Director |
13,958 |
2025-06-26 |
|
| 10 |
Gipson Dennis G |
Director |
13,958 |
2025-06-26 |
|
| 11 |
Newman Margaret |
Director |
13,958 |
2025-06-26 |
|
| 12 |
Kimbrough Orvin T |
Director |
13,958 |
2025-06-26 |
|
| 13 |
Buck Robert M |
Director |
13,050 |
2025-06-26 |
|
| 14 |
Schneider Laura K |
Chief Human Resources Officer |
12,873 |
2025-03-17 |
|
| 15 |
Harper Carla D |
Senior VP, Human Resources |
11,411 |
2026-03-13 |
|
| 16 |
Giles Jeffrey D |
EVP, Corporate Development |
9,681 |
2026-03-13 |
|
| 17 |
Whittenburg Mark G |
General Counsel and Secretary |
8,525 |
2026-03-13 |
|
| 18 |
Bradbury Robyn L |
Chief Financial Officer |
7,676 |
2026-03-13 |
|
| 19 |
Hope James D |
Director |
4,967 |
2025-06-26 |
|
| 20 |
Castellano James G |
Director |
4,638 |
2025-06-26 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-04-01 |
Burkhardt Jackie M |
General Counsel and Cco |
Unknown |
5,123 |
$3.24 |
$16.6K |
| 2026-04-01 |
Hardwick M Susan |
Director |
RSU Award |
580 |
- |
- |
| 2026-04-01 |
Hardwick M Susan |
Director |
Unknown |
- |
- |
- |
| 2026-03-12 |
Harper Carla D |
Senior VP, Human Resources |
RSU Award |
2,463 |
- |
- |
| 2026-03-11 |
Harper Carla D |
Senior VP, Human Resources |
Tax Withholding of RSU |
89 |
$49.16 |
$4.38K |
| 2026-03-12 |
Bradbury Robyn L |
Chief Financial Officer |
RSU Award |
4,824 |
- |
- |
| 2026-03-11 |
Bradbury Robyn L |
Chief Financial Officer |
Tax Withholding of RSU |
404 |
$49.16 |
$19.86K |
| 2026-03-12 |
Stephens John Weldon |
Chief Accounting Officer |
RSU Award |
6,684 |
$47.63 |
$318.36K |
| 2026-03-11 |
Stephens John Weldon |
Chief Accounting Officer |
Tax Withholding of RSU |
107 |
$49.16 |
$5.26K |
| 2026-03-12 |
Witkowski Mark R |
Chief Executive Officer |
RSU Award |
18,372 |
- |
- |
| 2026-03-11 |
Witkowski Mark R |
Chief Executive Officer |
Tax Withholding of RSU |
1,685 |
$49.16 |
$82.83K |
| 2026-03-11 |
Whittenburg Mark G |
General Counsel and Secretary |
Tax Withholding of RSU |
331 |
$49.16 |
$16.27K |
| 2026-03-12 |
Giles Jeffrey D |
EVP, Corporate Development |
RSU Award |
3,021 |
- |
- |
| 2026-03-12 |
Cowles Bradford A |
President |
RSU Award |
7,086 |
- |
- |
| 2026-03-11 |
Cowles Bradford A |
President |
Tax Withholding of RSU |
607 |
$49.16 |
$29.84K |
| 2026-03-12 |
Huebert Michael G. |
President |
RSU Award |
10,500 |
- |
- |
| 2026-03-11 |
Huebert Michael G. |
President |
Tax Withholding of RSU |
447 |
$49.16 |
$21.97K |
| 2026-03-10 |
Harper Carla D |
Senior VP, Human Resources |
Tax Withholding of RSU |
189 |
$49.38 |
$9.33K |
| 2026-03-09 |
Harper Carla D |
Senior VP, Human Resources |
Tax Withholding of RSU |
77 |
$49.96 |
$3.85K |
| 2026-03-10 |
Bradbury Robyn L |
Chief Financial Officer |
Tax Withholding of RSU |
205 |
$49.38 |
$10.12K |
| 2026-03-09 |
Bradbury Robyn L |
Chief Financial Officer |
Tax Withholding of RSU |
270 |
$49.96 |
$13.49K |
| 2026-03-10 |
Stephens John Weldon |
Chief Accounting Officer |
Tax Withholding of RSU |
198 |
$49.38 |
$9.78K |
| 2026-03-09 |
Stephens John Weldon |
Chief Accounting Officer |
Tax Withholding of RSU |
94 |
$49.96 |
$4.7K |
| 2026-03-10 |
Witkowski Mark R |
Chief Executive Officer |
Tax Withholding of RSU |
937 |
$49.38 |
$46.27K |
| 2026-03-09 |
Witkowski Mark R |
Chief Executive Officer |
Tax Withholding of RSU |
478 |
$49.96 |
$23.88K |
