Insider · CIK 0001866737
Mark G Whittenburg
Files at CNM (Core & Main, Inc.). First filing Jan 14, 2025, latest Jun 10, 2025.
Mark G Whittenburg files SEC Form 4 as officer at CNM (Core & Main, Inc.). Since Jan 14, 2025, Mark G Whittenburg has reported 0 open-market buys worth $0 and 3 open-market sells worth $8.3M, the latest filed on Jun 10, 2025.
A track record needs three past buys with six months of prices behind them; Mark G Whittenburg has 0, so none is measured yet.
The newest scored trade: sold $3.0M of CNM on Jun 6, 2025, filed Jun 10, 2025, scored 55 (moderate), under a 10b5-1 plan.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
CNM: Core & Main, Inc.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 55Moderate | Core & Main, Inc. | $3.0M 50,000 shares | -472% | +54% from low0% from high | |
| 55Moderate | Core & Main, Inc. | $2.8M 50,000 shares | -519% | - | |
| 55Moderate | Core & Main, Inc. | $2.5M 50,000 shares | -87% | - |
Planned sales
Form 144 notices this insider filed before selling restricted or control stock, newest first.
| Filed | Company | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| Jun 30, 2026 | CNM Core & Main, Inc. | 49,065 0.03% of outstanding | $2.4M | Jun 30, 2026 | $2.0M |
| May 29, 2026 | CNM Core & Main, Inc. | 18,814 0.01% of outstanding | $931k | May 29, 2026 | $1.1M |
| May 27, 2026 | CNM Core & Main, Inc. | 21,976 0.01% of outstanding | $1.1M | May 27, 2026 | none |
| Jun 6, 2025 | CNM Core & Main, Inc. | 50,000 0.03% of outstanding | $3.0M | Jun 6, 2025 | none |
| Jan 10, 2025 | CNM Core & Main, Inc. | 150,000 0.08% of outstanding | $7.6M | Jan 10, 2025 | none |
Transactions
Every row this insider has filed, 37 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Mar 11, 2026 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock | -331 | $49.16 | $16k | 8,525 | Mar 13, 2026 |
| Mar 9, 2026 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock | -278 | $49.96 | $14k | 9,413 | Mar 11, 2026 |
| Mar 10, 2026 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock | -557 | $49.38 | $28k | 8,856 | Mar 11, 2026 |
| Dec 31, 2025 | CNM Core & Main, Inc. | GGift Class B Common Stock and Limited Partnership Interestsderivativeindirect: By LLC | -25,500 | $0.00 | $0 | 227,312 | Jan 2, 2026 |
| Jun 6, 2025 | CNM Core & Main, Inc. | CConversion Class A Common Stock10b5-1 | +900 | $0.00 | $0 | 10,591 | Jun 10, 2025 |
| Jun 6, 2025 | CNM Core & Main, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -900 | $60.03 | $54k | 9,691 | Jun 10, 2025 |
| Jun 9, 2025 | CNM Core & Main, Inc. | CConversion Class A Common Stock10b5-1 | +49,100 | $0.00 | $0 | 58,791 | Jun 10, 2025 |
| Jun 9, 2025 | CNM Core & Main, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -49,100 | $60.03 | $2.9M | 9,691 | Jun 10, 2025 |
| Jun 6, 2025 | CNM Core & Main, Inc. | JOther Class B Common Stock and Limited Partnership Interestsderivativeindirect: By LLC10b5-1 | -900 | $0.00 | $0 | 301,912 | Jun 10, 2025 |
| Jun 6, 2025 | CNM Core & Main, Inc. | JOther Class B Common Stock and Limited Partnership Interestsderivative10b5-1 | +900 | $0.00 | $0 | 900 | Jun 10, 2025 |
| Jun 6, 2025 | CNM Core & Main, Inc. | CConversion Class B Common Stock and Limited Partnership Interestsderivative10b5-1 | -900 | $0.00 | $0 | 0 | Jun 10, 2025 |
| Jun 9, 2025 | CNM Core & Main, Inc. | JOther Class B Common Stock and Limited Partnership Interestsderivativeindirect: By LLC10b5-1 | -49,100 | $0.00 | $0 | 252,812 | Jun 10, 2025 |
| Jun 9, 2025 | CNM Core & Main, Inc. | JOther Class B Common Stock and Limited Partnership Interestsderivative10b5-1 | +49,100 | $0.00 | $0 | 49,100 | Jun 10, 2025 |
| Jun 9, 2025 | CNM Core & Main, Inc. | CConversion Class B Common Stock and Limited Partnership Interestsderivative10b5-1 | -49,100 | $0.00 | $0 | 0 | Jun 10, 2025 |
| Mar 13, 2025 | CNM Core & Main, Inc. | AGrant or award Class A Common Stock | +3,411 | $0.00 | $0 | 9,691 | Mar 17, 2025 |
| Mar 13, 2025 | CNM Core & Main, Inc. | AGrant or award Options (Rights to Buy)derivative | +24,828 | $0.00 | $0 | 24,828 | Mar 17, 2025 |
| Mar 11, 2025 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock | -510 | $46.55 | $24k | 6,280 | Mar 13, 2025 |
| Mar 7, 2025 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock | -278 | $47.87 | $13k | 7,389 | Mar 11, 2025 |
| Mar 10, 2025 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock | -599 | $46.69 | $28k | 6,790 | Mar 11, 2025 |
| Jan 15, 2025 | CNM Core & Main, Inc. | CConversion Class A Common Stock10b5-1 | +1,974 | $0.00 | $0 | 9,641 | Jan 17, 2025 |
| Jan 15, 2025 | CNM Core & Main, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -1,974 | $55.29 | $109k | 7,667 | Jan 17, 2025 |
| Jan 16, 2025 | CNM Core & Main, Inc. | CConversion Class A Common Stock10b5-1 | +48,026 | $0.00 | $0 | 55,693 | Jan 17, 2025 |
| Jan 16, 2025 | CNM Core & Main, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -48,026 | $55.13 | $2.6M | 7,667 | Jan 17, 2025 |
| Jan 15, 2025 | CNM Core & Main, Inc. | JOther Class B Common Stock and Limited Partnership Interestsderivativeindirect: By LLC10b5-1 | -1,974 | $0.00 | $0 | 350,838 | Jan 17, 2025 |
| Jan 15, 2025 | CNM Core & Main, Inc. | JOther Class B Common Stock and Limited Partnership Interestsderivative10b5-1 | +1,974 | $0.00 | $0 | 1,974 | Jan 17, 2025 |
| Jan 15, 2025 | CNM Core & Main, Inc. | CConversion Class B Common Stock and Limited Partnership Interestsderivative10b5-1 | -1,974 | $0.00 | $0 | 0 | Jan 17, 2025 |
| Jan 16, 2025 | CNM Core & Main, Inc. | JOther Class B Common Stock and Limited Partnership Interestsderivativeindirect: By LLC10b5-1 | -48,026 | $0.00 | $0 | 302,812 | Jan 17, 2025 |
| Jan 16, 2025 | CNM Core & Main, Inc. | JOther Class B Common Stock and Limited Partnership Interestsderivative10b5-1 | +48,026 | $0.00 | $0 | 48,026 | Jan 17, 2025 |
| Jan 16, 2025 | CNM Core & Main, Inc. | CConversion Class B Common Stock and Limited Partnership Interestsderivative10b5-1 | -48,026 | $0.00 | $0 | 0 | Jan 17, 2025 |
| Mar 13, 2023 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock10b5-1 | -610 | $21.45 | $13k | 12,323 | Jan 14, 2025 |
| Mar 11, 2024 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock10b5-1 | -599 | $48.29 | $29k | 11,724 | Jan 14, 2025 |
| Mar 11, 2024 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock10b5-1 | -509 | $48.29 | $25k | 11,215 | Jan 14, 2025 |
| Jan 10, 2025 | CNM Core & Main, Inc. | CConversion Class A Common Stock10b5-1 | +46,452 | $0.00 | $0 | 57,667 | Jan 14, 2025 |
| Jan 10, 2025 | CNM Core & Main, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -50,000 | $50.49 | $2.5M | 7,667 | Jan 14, 2025 |
| Jan 10, 2025 | CNM Core & Main, Inc. | JOther Class B Common Stock and Limited Partnership Interestsderivativeindirect: By LLC10b5-1 | -46,452 | $0.00 | $0 | 352,812 | Jan 14, 2025 |
| Jan 10, 2025 | CNM Core & Main, Inc. | JOther Class B Common Stock and Limited Partnership Interestsderivative10b5-1 | +46,452 | $0.00 | $0 | 46,452 | Jan 14, 2025 |
| Jan 10, 2025 | CNM Core & Main, Inc. | CConversion Class B Common Stock and Limited Partnership Interestsderivative10b5-1 | -46,452 | $0.00 | $0 | 0 | Jan 14, 2025 |
Questions about Mark G Whittenburg
Answered from the filings on this page, as of the latest one.
Is Mark G Whittenburg buying or selling?
Not in the last 12 months. Mark G Whittenburg's latest open-market trade on SEC Form 4 was sold $3.0M of CNM on Jun 6, 2025.
How did Mark G Whittenburg's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Mark G Whittenburg has 0.
Where does Mark G Whittenburg file Form 4?
Mark G Whittenburg has filed Form 4 at CNM (Core & Main, Inc.) as General Counsel and Secretary. A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.