CNM (Core & Main, Inc.)
Insider Trading Activity
Every open-market purchase and sale reported by CNM officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-05 | Carla D Harper | Senior VP, Human Resources | F | — | — |
| 2026-07-23 | MICHAEL G. HUEBERT | President | F | — | — |
| 2026-07-08 | James D Hope | Director | Buy | — | — |
| 2026-06-24 | Carla D Harper | Senior VP, Human Resources | F | — | — |
| 2026-06-24 | M Susan Hardwick | Director | A | — | — |
| 2026-06-24 | Orvin T Kimbrough | Director | A | — | — |
| 2026-06-24 | Dennis G Gipson | Director | A | — | — |
| 2026-06-24 | Robert M Buck | Director | A | — | — |
| 2026-06-24 | James G Castellano | Director | A | — | — |
| 2026-06-24 | James D Hope | Director | A | — | — |
| 2026-06-24 | MARGARET NEWMAN | Director | A | — | — |
| 2026-06-24 | Bhavani Amirthalingam | Director | A | — | — |
| 2026-06-24 | KATHLEEN M MAZZARELLA | Director | A | — | — |
| 2026-04-21 | Robyn L Bradbury | Chief Financial Officer | MIXED | — | — |
| 2026-04-09 | James D Hope | Director | Buy | — | — |
| 2026-04-02 | M Susan Hardwick | Director | A | — | — |
| 2026-03-13 | Carla D Harper | Senior VP, Human Resources | MIXED | — | — |
| 2026-03-13 | MICHAEL G. HUEBERT | President | MIXED | — | — |
| 2026-03-13 | John Weldon Stephens | Chief Accounting Officer | MIXED | — | — |
| 2026-03-13 | Bradford A Cowles | President | MIXED | — | — |
| 2026-03-13 | Mark R Witkowski | Chief Executive Officer | MIXED | — | — |
| 2026-03-13 | Robyn L Bradbury | Chief Financial Officer | MIXED | — | — |
| 2026-03-13 | Mark G Whittenburg | General Counsel and Secretary | F | — | — |
| 2026-03-13 | Jeffrey D Giles | EVP, Corporate Development | A | — | — |
| 2026-03-11 | Robyn L Bradbury | Chief Financial Officer | F | — | — |
| 2026-03-11 | Stephen O LeClair | Executive Chair | F | — | — |
| 2026-03-11 | Mark R Witkowski | Chief Executive Officer | F | — | — |
| 2026-03-11 | Bradford A Cowles | President | F | — | — |
| 2026-03-11 | MICHAEL G. HUEBERT | President | F | — | — |
| 2026-03-11 | John Weldon Stephens | Chief Accounting Officer | F | — | — |
| 2026-03-11 | Carla D Harper | Senior VP, Human Resources | F | — | — |
| 2026-03-11 | Mark G Whittenburg | General Counsel and Secretary | F | — | — |
| 2026-01-28 | Jeffrey D Giles | EVP, Corporate Development | A | — | — |
| 2026-01-02 | Mark G Whittenburg | General Counsel and Secretary | G | — | — |
| 2025-09-16 | John Weldon Stephens | Chief Accounting Officer | M | — | — |
| 2025-09-05 | Carla D Harper | Senior VP, Human Resources | A | — | — |
| 2025-08-20 | Mark R Witkowski | Chief Executive Officer | MIXED | — | — |
| 2025-07-23 | Robyn L Bradbury | Chief Financial Officer | MIXED | — | — |
| 2025-07-23 | MICHAEL G. HUEBERT | President | F | — | — |
| 2025-07-21 | Mark R Witkowski | Chief Executive Officer | MIXED | — | — |
| 2025-07-21 | Orvin T Kimbrough | Director | MIXED | — | — |
| 2025-07-21 | James G Castellano | Director | MIXED | — | — |
| 2025-07-08 | Stephen O LeClair | Executive Chair | MIXED | — | — |
| 2025-07-03 | Robyn L Bradbury | Chief Financial Officer | MIXED | — | — |
| 2025-06-26 | KATHLEEN M MAZZARELLA | Director | A | — | — |
| 2025-06-26 | James D Hope | Director | A | — | — |
| 2025-06-26 | Bhavani Amirthalingam | Director | A | — | — |
| 2025-06-26 | Robert M Buck | Director | A | — | — |
| 2025-06-26 | Orvin T Kimbrough | Director | A | — | — |
| 2025-06-26 | Dennis G Gipson | Director | A | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | 10%+ Owner | 593,368 | — |
| — | 10%+ Owner | 284,871 | — |
| — | Director | 129,634 | — |
| — | 10%+ Owner | 113,429 | — |
| — | Executive Vice President | 79,483 | — |
| — | Executive Chair | 69,217 | — |
| — | Chief Human Resources Officer | 58,568 | — |
| — | Director | 51,431 | — |
| — | Chief Executive Officer | 51,119 | — |
| — | Director | 41,757 | — |
| — | President | 25,491 | — |
| — | President | 24,036 | — |
| — | Director | 17,955 | — |
| — | Director | 16,839 | — |
| — | Director | 16,760 | — |
| — | Director | 16,757 | — |
| — | Chief Accounting Officer | 16,438 | — |
| — | Director | 15,849 | — |
| — | Senior VP, Human Resources | 13,064 | — |
| — | Chief Financial Officer | 12,522 | — |
| — | Director | 11,805 | — |
| — | EVP, Corporate Development | 9,681 | — |
| — | General Counsel and Secretary | 8,525 | — |
| — | Director | 3,379 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the CNM quote page; the site-wide leaderboard is on the insider transactions hub.