As of September 29, 2026, the three largest insider holders of CNM are Stephen O Leclair (Executive Chair, 66.14K shares), Mark R Witkowski (Chief Executive Officer, 51.12K shares), Bradford A Cowles (President, 25.49K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Stephen O Leclair | Executive Chair | 66,136 | 0 | 66,136 | 17.2% | 11 Mar, 2026 |
| 2 | Mark R Witkowski | Chief Executive Officer | 51,119 | 0 | 51,119 | 13.3% | 13 Mar, 2026 |
| 3 | Bradford A Cowles | President | 25,491 | 0 | 25,491 | 6.6% | 13 Mar, 2026 |
| 4 | Michael G. Huebert | President | 24,036 | 0 | 24,036 | 6.3% | 23 Jul, 2026 |
| 5 | John R Schaller | Executive Vice President | 19,689 | 0 | 19,689 | 5.1% | 30 May, 2025 |
| 6 | Bhavani Amirthalingam | Director | 17,955 | 0 | 17,955 | 4.7% | 24 Jun, 2026 |
| 7 | John Weldon Stephens | Chief Accounting Officer | 17,374 | 0 | 17,374 | 4.5% | 13 Mar, 2026 |
| 8 | Margaret Newman | Director | 16,757 | 0 | 16,757 | 4.4% | 24 Jun, 2026 |
| 9 | Kathleen M Mazzarella | Director | 16,757 | 0 | 16,757 | 4.4% | 24 Jun, 2026 |
| 10 | Dennis G Gipson | Director | 16,757 | 0 | 16,757 | 4.4% | 24 Jun, 2026 |
| 11 | Orvin T Kimbrough | Director | 16,757 | 0 | 16,757 | 4.4% | 24 Jun, 2026 |
| 12 | Robert M Buck | Director | 15,849 | 0 | 15,849 | 4.1% | 24 Jun, 2026 |
| 13 | Carla D Harper | Senior Vp, Human Resources | 13,064 | 0 | 13,064 | 3.4% | 05 Aug, 2026 |
| 14 | Laura K Schneider | Chief Human Resources Officer | 12,873 | 0 | 12,873 | 3.4% | 05 Jun, 2025 |
| 15 | Robyn L Bradbury | Chief Financial Officer | 12,500 | 0 | 12,500 | 3.3% | 21 Apr, 2026 |
| 16 | James D Hope | Director | 11,805 | 0 | 11,805 | 3.1% | 08 Jul, 2026 |
| 17 | Jeffrey D Giles | Evp, Corporate Development | 9,681 | 0 | 9,681 | 2.5% | 13 Mar, 2026 |
| 18 | Mark G Whittenburg | General Counsel And Secretary | 8,525 | 0 | 8,525 | 2.2% | 13 Mar, 2026 |
| 19 | James G Castellano | Director | 7,437 | 0 | 7,437 | 1.9% | 24 Jun, 2026 |
| 20 | M Susan Hardwick | Director | 3,379 | 0 | 3,379 | 0.9% | 24 Jun, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 04 Aug, 2026 | Carla D Harper | Senior Vp, Human Resources | Disposed F | 242 | $46.32 | $11.21K | 13,064 | Direct |
| 22 Jul, 2026 | Michael G. Huebert | President | Disposed F | 1,301 | $43.75 | $56.92K | 24,036 | Direct |
| 06 Jul, 2026 | James D Hope | Director | Acquired P | 2,067 | $46.01 | $95.11K | 11,805 | Direct |
| 23 Jun, 2026 | Dennis G Gipson | Director | Acquired A | 2,799 | $0.00 | $0 | 16,757 | Direct |
| 23 Jun, 2026 | Bhavani Amirthalingam | Director | Acquired A | 2,799 | $0.00 | $0 | 17,955 | Direct |
| 22 Jun, 2026 | Carla D Harper | Senior Vp, Human Resources | Disposed F | 568 | $47.25 | $26.84K | 13,306 | Direct |
| 23 Jun, 2026 | Margaret Newman | Director | Acquired A | 2,799 | $0.00 | $0 | 16,757 | Direct |
| 23 Jun, 2026 | Robert M Buck | Director | Acquired A | 2,799 | $0.00 | $0 | 15,849 | Direct |
| 23 Jun, 2026 | Kathleen M Mazzarella | Director | Acquired A | 2,799 | $0.00 | $0 | 16,757 | Direct |
| 23 Jun, 2026 | James G Castellano | Director | Acquired A | 2,799 | $0.00 | $0 | 7,437 | Direct |
| 23 Jun, 2026 | James D Hope | Director | Acquired A | 2,799 | $0.00 | $0 | 9,738 | Direct |
| 23 Jun, 2026 | Orvin T Kimbrough | Director | Acquired A | 2,799 | $0.00 | $0 | 16,757 | Direct |
| 23 Jun, 2026 | M Susan Hardwick | Director | Acquired A | 2,799 | $0.00 | $0 | 3,379 | Direct |
| 17 Apr, 2026 | Robyn L Bradbury | Chief Financial Officer | Acquired C | 5,000 | $0.00 | $0 | 17,500 | Direct |
| 17 Apr, 2026 | Robyn L Bradbury | Chief Financial Officer | Disposed S | 1,647 | $51.94 | $85.55K | 15,853 | Direct |
| 17 Apr, 2026 | Robyn L Bradbury | Chief Financial Officer | Disposed S | 3,353 | $52.84 | $177.18K | 12,500 | Direct |
| 17 Apr, 2026 | Robyn L Bradbury | Chief Financial Officer | Disposed J | 5,000 | $0.00 | $0 | 152,447 | Indirect |
| 17 Apr, 2026 | Robyn L Bradbury | Chief Financial Officer | Acquired J | 5,000 | $0.00 | $0 | 5,000 | Direct |
| 17 Apr, 2026 | Robyn L Bradbury | Chief Financial Officer | Disposed C | 5,000 | $0.00 | $0 | 0 | Direct |
| 07 Apr, 2026 | James D Hope | Director | Acquired P | 1,972 | $50.70 | $99.97K | 6,939 | Direct |