Mark R. Witkowski, CEO of Core & Main, Inc. ($CNM), sold shares on the open market three times over the past year for a total of $12.5 million. His latest sale occurred on August 18, 2025. These transactions rank 948th among 11,700 insiders by sale value, trailing the average of $8.6 million across 6.4 trades per person. Witkowski made no open market purchases in this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 12, 2026 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | A | Options (Rights to Buy) | 131382 | $0.00 | 131,382.0000 | 198,302,805 | 9999.99% | 0.07% |
| March 12, 2026 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | A | Class A Common Stock | 18372 | $0.00 | 51,119.0000 | 198,302,805 | 56.10% | 0.01% |
| March 11, 2026 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | F | Class A Common Stock | 1685 | $49.16 | 32,747.0000 | 198,302,805 | 4.89% | 0.00% |
| March 10, 2026 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | F | Class A Common Stock | 937 | $49.38 | 34,432.0000 | 198,302,805 | 2.65% | 0.00% |
| March 9, 2026 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | F | Class A Common Stock | 478 | $49.96 | 35,369.0000 | 198,302,805 | 1.33% | 0.00% |
| Aug. 18, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | C | Class A Common Stock | 100000 | $0.00 | 135,847.0000 | 201,442,750 | 278.96% | 0.05% |
| Aug. 18, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | S | Class A Common Stock | 100000 | $64.08 | 35,847.0000 | 201,442,750 | 73.61% | 0.05% |
| Aug. 18, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | J | Class B Common Stock and Limited Partnership Interests | 100000 | $0.00 | 616,250.0000 | 201,442,750 | 13.96% | 0.05% |
| Aug. 18, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | J | Class B Common Stock and Limited Partnership Interests | 100000 | $0.00 | 716,250.0000 | 201,442,750 | 16.23% | 0.05% |
| Aug. 18, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | C | Class B Common Stock and Limited Partnership Interests | 100000 | $0.00 | 616,250.0000 | 201,442,750 | 13.96% | 0.05% |
| July 17, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | C | Class B Common Stock and Limited Partnership Interests | 100000 | $0.00 | 716,250.0000 | 201,442,750 | 12.25% | 0.05% |
| July 17, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | J | Class B Common Stock and Limited Partnership Interests | 100000 | $0.00 | 816,250.0000 | 201,442,750 | 13.96% | 0.05% |
| July 17, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | J | Class B Common Stock and Limited Partnership Interests | 100000 | $0.00 | 716,250.0000 | 201,442,750 | 12.25% | 0.05% |
| July 17, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | S | Class A Common Stock | 27669 | $61.63 | 35,847.0000 | 201,442,750 | 43.56% | 0.01% |
| July 17, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | S | Class A Common Stock | 72331 | $61.12 | 63,516.0000 | 201,442,750 | 53.24% | 0.04% |
| July 17, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | C | Class A Common Stock | 100000 | $0.00 | 135,847.0000 | 201,442,750 | 278.96% | 0.05% |
| March 31, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | A | Options (Rights to Buy) | 73458 | $0.00 | 73,458.0000 | 201,442,750 | 9999.99% | 0.04% |
| March 31, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Executive Officer | A | Class A Common Stock | 10092 | $0.00 | 35,847.0000 | 201,442,750 | 39.18% | 0.01% |
| March 13, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | A | Options (Rights to Buy) | 53094 | $0.00 | 53,094.0000 | 201,442,750 | 9999.99% | 0.03% |
| March 13, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | A | Class A Common Stock | 7296 | $0.00 | 25,755.0000 | 201,442,750 | 39.53% | 0.00% |
| March 11, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | F | Class A Common Stock | 925 | $46.55 | 18,459.0000 | 201,442,750 | 4.77% | 0.00% |
| March 7, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | F | Class A Common Stock | 536 | $47.87 | 20,380.0000 | 201,442,750 | 2.56% | 0.00% |
| March 10, 2025 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | F | Class A Common Stock | 996 | $46.69 | 19,384.0000 | 201,442,750 | 4.89% | 0.00% |
| March 13, 2023 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | F | Class A Common Stock | 1054 | $21.45 | 22,844.0000 | 246,217,004 | 4.41% | 0.00% |
| March 11, 2024 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | F | Class A Common Stock | 999 | $48.29 | 21,845.0000 | 227,818,077 | 4.37% | 0.00% |
| March 11, 2024 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | F | Class A Common Stock | 929 | $48.29 | 20,916.0000 | 227,818,077 | 4.25% | 0.00% |
| May 8, 2024 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | J | Class B Common Stock and Limited Partnership Interests | 50000 | $0.00 | 816,250.0000 | 227,818,077 | 5.77% | 0.02% |
| May 8, 2024 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | J | Class B Common Stock and Limited Partnership Interests | 50000 | $0.00 | 866,250.0000 | 227,818,077 | 6.13% | 0.02% |
| May 8, 2024 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | C | Class B Common Stock and Limited Partnership Interests | 50000 | $0.00 | 816,250.0000 | 227,818,077 | 5.77% | 0.02% |
| May 8, 2024 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | S | Class A Common Stock | 50000 | $59.50 | 23,898.0000 | 227,818,077 | 67.66% | 0.02% |
| May 8, 2024 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | C | Class A Common Stock | 50000 | $0.00 | 73,898.0000 | 227,818,077 | 209.22% | 0.02% |
| April 8, 2024 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | C | Class A Common Stock | 50000 | $0.00 | 73,898.0000 | 227,818,077 | 209.22% | 0.02% |
| April 8, 2024 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | J | Class B Common Stock and Limited Partnership Interests | 50000 | $0.00 | 916,250.0000 | 227,818,077 | 5.77% | 0.02% |
| April 8, 2024 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | C | Class B Common Stock and Limited Partnership Interests | 50000 | $0.00 | 866,250.0000 | 227,818,077 | 5.46% | 0.02% |
| April 8, 2024 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | S | Class A Common Stock | 50000 | $58.51 | 23,898.0000 | 227,818,077 | 67.66% | 0.02% |
| April 8, 2024 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | J | Class B Common Stock and Limited Partnership Interests | 50000 | $0.00 | 866,250.0000 | 227,818,077 | 5.46% | 0.02% |
| March 7, 2024 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | A | Options (Rights to Buy) | 36726 | $0.00 | 36,726.0000 | 227,818,077 | 9999.99% | 0.02% |
| March 7, 2024 | Core & Main, Inc. | $CNM | Witkowski Mark R | Chief Financial Officer | A | Class A Common Stock | 4677 | $0.00 | 23,898.0000 | 227,818,077 | 24.33% | 0.00% |