Mark G. Whittenburg is CLO & Secretary at Core & Main, Inc. (CNM). They have made 6 open-market trades across 1 company since 2022, most recently 2026-03-11.
CIK 0001866737
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 6 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| CNM | 8,525 | $358K |
Shares reported on the most recent Form 4, priced at the 2026-03-13 close.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| CNM | SELL · 10b5-1 | 2025-06-06 | 2025-06-10 | $60.03 | $3.0M | -0.4% | +6.4% | +13.7% |
| CNM | SELL · 10b5-1 | 2025-01-15 | 2025-01-17 | $55.14 | $5.5M | +1.7% | -2.6% | -11.5% |
| CNM | SELL · 10b5-1 | 2025-01-10 | 2025-01-14 | $50.49 | $2.5M | +1.0% | -2.7% | -11.1% |
| CNM | SELL · 10b5-1 | 2024-04-19 | 2024-04-23 | $54.08 | $2.7M | +3.6% | +4.5% | -7.7% |
| CNM | SELL | 2024-03-22 | 2024-03-26 | $57.91 | $2.9M | +1.7% | -1.5% | -12.4% |
| CNM | SELL · 10b5-1 | 2023-04-13 | 2023-04-17 | $25.06 | $1.6M | +5.5% | +10.1% | +26.8% |
| CNM | SELL | 2023-03-03 | 2023-03-07 | $24.02 | $1.5M | -12.0% | -7.1% | +14.9% |
| CNM | SELL | 2023-02-24 | 2023-02-28 | $23.04 | $1.1M | -4.7% | -1.3% | +17.2% |
| CNM | SELL | 2023-02-17 | 2023-02-22 | $23.06 | $296K | +5.0% | -7.5% | +18.3% |
| CNM | SELL | 2022-09-09 | 2022-09-13 | $24.78 | $978K | -13.4% | -10.6% | -19.5% |
| CNM | SELL | 2022-08-16 | 2022-08-18 | $24.79 | $569K | -2.6% | -2.9% | -13.7% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.