Mark G. Whittenburg, General Counsel and Secretary of Core & Main, Inc. (CNM), made two open market sales of company shares over the past year, totaling about $3 million. His most recent sale occurred on June 9, 2025. These transactions rank 2,719th among 11,678 insiders by sale value, well below the average of $8.6 million across 6.4 sales per insider. He reported 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 11, 2026 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | F | Class A Common Stock | 331 | $49.16 | 8,525.0000 | 198,302,805 | 3.74% | 0.00% |
| March 9, 2026 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | F | Class A Common Stock | 278 | $49.96 | 9,413.0000 | 198,302,805 | 2.87% | 0.00% |
| March 10, 2026 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | F | Class A Common Stock | 557 | $49.38 | 8,856.0000 | 198,302,805 | 5.92% | 0.00% |
| Dec. 31, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | G | Class B Common Stock and Limited Partnership Interests | 25500 | $0.00 | 227,312.0000 | 198,302,805 | 10.09% | 0.01% |
| June 9, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class B Common Stock and Limited Partnership Interests | 49100 | $0.00 | 301,912.0000 | 201,442,750 | 19.42% | 0.02% |
| June 9, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | C | Class B Common Stock and Limited Partnership Interests | 49100 | $0.00 | 252,812.0000 | 201,442,750 | 16.26% | 0.02% |
| June 6, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class B Common Stock and Limited Partnership Interests | 900 | $0.00 | 253,712.0000 | 201,442,750 | 0.36% | 0.00% |
| June 6, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | C | Class B Common Stock and Limited Partnership Interests | 900 | $0.00 | 252,812.0000 | 201,442,750 | 0.35% | 0.00% |
| June 6, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | C | Class A Common Stock | 900 | $0.00 | 10,591.0000 | 201,442,750 | 9.29% | 0.00% |
| June 9, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class B Common Stock and Limited Partnership Interests | 49100 | $0.00 | 252,812.0000 | 201,442,750 | 16.26% | 0.02% |
| June 6, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | S | Class A Common Stock | 900 | $60.03 | 9,691.0000 | 201,442,750 | 8.50% | 0.00% |
| June 9, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | C | Class A Common Stock | 49100 | $0.00 | 58,791.0000 | 201,442,750 | 506.66% | 0.02% |
| June 9, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | S | Class A Common Stock | 49100 | $60.03 | 9,691.0000 | 201,442,750 | 83.52% | 0.02% |
| June 6, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class B Common Stock and Limited Partnership Interests | 900 | $0.00 | 301,912.0000 | 201,442,750 | 0.30% | 0.00% |
| March 13, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | A | Class A Common Stock | 3411 | $0.00 | 9,691.0000 | 201,442,750 | 54.32% | 0.00% |
| March 13, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | A | Options (Rights to Buy) | 24828 | $0.00 | 24,828.0000 | 201,442,750 | 9999.99% | 0.01% |
| March 11, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | F | Class A Common Stock | 510 | $46.55 | 6,280.0000 | 201,442,750 | 7.51% | 0.00% |
| March 10, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | F | Class A Common Stock | 599 | $46.69 | 6,790.0000 | 201,442,750 | 8.11% | 0.00% |
| March 7, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | F | Class A Common Stock | 278 | $47.87 | 7,389.0000 | 201,442,750 | 3.63% | 0.00% |
| Jan. 15, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class B Common Stock and Limited Partnership Interests | 1974 | $0.00 | 350,838.0000 | 202,146,712 | 0.56% | 0.00% |
| Jan. 15, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class B Common Stock and Limited Partnership Interests | 1974 | $0.00 | 304,786.0000 | 202,146,712 | 0.65% | 0.00% |
| Jan. 15, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | C | Class B Common Stock and Limited Partnership Interests | 1974 | $0.00 | 302,812.0000 | 202,146,712 | 0.65% | 0.00% |
| Jan. 16, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class B Common Stock and Limited Partnership Interests | 48026 | $0.00 | 302,812.0000 | 202,146,712 | 13.69% | 0.02% |
| Jan. 16, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class B Common Stock and Limited Partnership Interests | 48026 | $0.00 | 350,838.0000 | 202,146,712 | 15.86% | 0.02% |
| Jan. 16, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | C | Class B Common Stock and Limited Partnership Interests | 48026 | $0.00 | 302,812.0000 | 202,146,712 | 13.69% | 0.02% |
| Jan. 16, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | C | Class A Common Stock | 48026 | $0.00 | 55,693.0000 | 202,146,712 | 626.40% | 0.02% |
| Jan. 15, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | S | Class A Common Stock | 1974 | $55.29 | 7,667.0000 | 202,146,712 | 20.48% | 0.00% |
| Jan. 15, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | C | Class A Common Stock | 1974 | $0.00 | 9,641.0000 | 202,146,712 | 25.75% | 0.00% |
| Jan. 16, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | S | Class A Common Stock | 48026 | $55.13 | 7,667.0000 | 202,146,712 | 86.23% | 0.02% |
| Jan. 10, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class B Common Stock and Limited Partnership Interests | 46452 | $0.00 | 399,264.0000 | 202,146,712 | 13.17% | 0.02% |
| March 13, 2023 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | F | Class A Common Stock | 610 | $21.45 | 12,323.0000 | 246,217,004 | 4.72% | 0.00% |
| March 11, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | F | Class A Common Stock | 599 | $48.29 | 11,724.0000 | 227,818,077 | 4.86% | 0.00% |
| March 11, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | F | Class A Common Stock | 509 | $48.29 | 11,215.0000 | 227,818,077 | 4.34% | 0.00% |
| Jan. 10, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | C | Class A Common Stock | 46452 | $0.00 | 57,667.0000 | 202,146,712 | 414.20% | 0.02% |
| Jan. 10, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | S | Class A Common Stock | 50000 | $50.49 | 7,667.0000 | 202,146,712 | 86.70% | 0.02% |
| Jan. 10, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class B Common Stock and Limited Partnership Interests | 46452 | $0.00 | 352,812.0000 | 202,146,712 | 11.63% | 0.02% |
| Jan. 10, 2025 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | C | Class B Common Stock and Limited Partnership Interests | 46452 | $0.00 | 352,812.0000 | 202,146,712 | 11.63% | 0.02% |
| April 19, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | C | Class B Common Stock and Limited Partnership Interests | 50000 | $0.00 | 399,264.0000 | 227,818,077 | 11.13% | 0.02% |
| April 19, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class B Common Stock and Limited Partnership Interests | 50000 | $0.00 | 449,264.0000 | 227,818,077 | 12.52% | 0.02% |
| April 19, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class B Common Stock and Limited Partnership Interests | 50000 | $0.00 | 399,264.0000 | 227,818,077 | 11.13% | 0.02% |
| April 19, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | S | Class A Common Stock | 50000 | $54.08 | 12,933.0000 | 227,818,077 | 79.45% | 0.02% |
| April 19, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | C | Class A Common Stock | 50000 | $0.00 | 62,933.0000 | 227,818,077 | 386.61% | 0.02% |
| March 22, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class B Common Stock and Limited Partnership Interests | 49940 | $0.00 | 449,264.0000 | 227,818,077 | 10.00% | 0.02% |
| March 22, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class B Common Stock and Limited Partnership Interests | 49940 | $0.00 | 499,204.0000 | 227,818,077 | 11.12% | 0.02% |
| March 22, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | C | Class B Common Stock and Limited Partnership Interests | 49940 | $0.00 | 449,264.0000 | 227,818,077 | 10.00% | 0.02% |
| March 22, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | C | Class A Common Stock | 49940 | $0.00 | 62,933.0000 | 227,818,077 | 384.36% | 0.02% |
| March 22, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | S | Class A Common Stock | 50000 | $57.91 | 12,933.0000 | 227,818,077 | 79.45% | 0.02% |
| March 22, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class A Common Stock | 60 | $0.00 | 12,933.0000 | 227,818,077 | 0.46% | 0.00% |
| March 22, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | J | Class A Common Stock | 60 | $0.00 | 12,993.0000 | 227,818,077 | 0.46% | 0.00% |
| March 7, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | A | Class A Common Stock | 2421 | $0.00 | 12,993.0000 | 227,818,077 | 22.90% | 0.00% |
| March 7, 2024 | Core & Main, Inc. | $CNM | Whittenburg Mark G | General Counsel and Secretary | A | Options (Rights to Buy) | 18999 | $0.00 | 18,999.0000 | 227,818,077 | 9999.99% | 0.01% |