Insider · CIK 0001866738
Mark R Witkowski
Files at CNM (Core & Main, Inc.). First filing Jul 21, 2025, latest Aug 20, 2025.
Mark R Witkowski files SEC Form 4 as CFO, CEO and director at CNM (Core & Main, Inc.). Since Jul 21, 2025, Mark R Witkowski has reported 0 open-market buys worth $0 and 2 open-market sells worth $13M, the latest filed on Aug 20, 2025.
A track record needs three past buys with six months of prices behind them; Mark R Witkowski has 0, so none is measured yet.
The newest scored trade: sold $6.4M of CNM on Aug 18, 2025, filed Aug 20, 2025, scored 50 (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 |
|---|---|---|---|---|---|
| 50Moderate | Core & Main, Inc. | $6.4M 100,000 shares | -74% | +67% from low-1% from high | |
| 65Notable | Core & Main, Inc. | $6.1M 100,000 shares | -74% | +59% from low-1% from high |
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 |
|---|---|---|---|---|---|
| Jul 17, 2025 | CNM Core & Main, Inc. | 100,000 0.05% of outstanding | $6.0M | Jul 17, 2025 | none |
Transactions
Every row this insider has filed, 26 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 | -1,685 | $49.16 | $83k | 32,747 | Mar 13, 2026 |
| Mar 12, 2026 | CNM Core & Main, Inc. | AGrant or award Class A Common Stock | +18,372 | $0.00 | $0 | 51,119 | Mar 13, 2026 |
| Mar 12, 2026 | CNM Core & Main, Inc. | AGrant or award Options (Rights to Buy)derivative | +131,382 | $0.00 | $0 | 131,382 | Mar 13, 2026 |
| Mar 9, 2026 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock | -478 | $49.96 | $24k | 35,369 | Mar 11, 2026 |
| Mar 10, 2026 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock | -937 | $49.38 | $46k | 34,432 | Mar 11, 2026 |
| Aug 18, 2025 | CNM Core & Main, Inc. | CConversion Class A Common Stock10b5-1 | +100,000 | $0.00 | $0 | 135,847 | Aug 20, 2025 |
| Aug 18, 2025 | CNM Core & Main, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -100,000 | $64.08 | $6.4M | 35,847 | Aug 20, 2025 |
| Aug 18, 2025 | CNM Core & Main, Inc. | JOther Class B Common Stock and Limited Partnership Interestsderivativeindirect: By LLC10b5-1 | -100,000 | $0.00 | $0 | 616,250 | Aug 20, 2025 |
| Aug 18, 2025 | CNM Core & Main, Inc. | JOther Class B Common Stock and Limited Partnership Interestsderivative10b5-1 | +100,000 | $0.00 | $0 | 100,000 | Aug 20, 2025 |
| Aug 18, 2025 | CNM Core & Main, Inc. | CConversion Class B Common Stock and Limited Partnership Interestsderivative10b5-1 | -100,000 | $0.00 | $0 | 0 | Aug 20, 2025 |
| Jul 17, 2025 | CNM Core & Main, Inc. | CConversion Class A Common Stock10b5-1 | +100,000 | $0.00 | $0 | 135,847 | Jul 21, 2025 |
| Jul 17, 2025 | CNM Core & Main, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -72,331 | $61.12 | $4.4M | 63,516 | Jul 21, 2025 |
| Jul 17, 2025 | CNM Core & Main, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -27,669 | $61.63 | $1.7M | 35,847 | Jul 21, 2025 |
| Jul 17, 2025 | CNM Core & Main, Inc. | JOther Class B Common Stock and Limited Partnership Interestsderivativeindirect: By LLC10b5-1 | -100,000 | $0.00 | $0 | 716,250 | Jul 21, 2025 |
| Jul 17, 2025 | CNM Core & Main, Inc. | JOther Class B Common Stock and Limited Partnership Interestsderivative10b5-1 | +100,000 | $0.00 | $0 | 100,000 | Jul 21, 2025 |
| Jul 17, 2025 | CNM Core & Main, Inc. | CConversion Class B Common Stock and Limited Partnership Interestsderivative10b5-1 | -100,000 | $0.00 | $0 | 0 | Jul 21, 2025 |
| Mar 31, 2025 | CNM Core & Main, Inc. | AGrant or award Class A Common Stock | +10,092 | $0.00 | $0 | 35,847 | Apr 2, 2025 |
| Mar 31, 2025 | CNM Core & Main, Inc. | AGrant or award Options (Rights to Buy)derivative | +73,458 | $0.00 | $0 | 73,458 | Apr 2, 2025 |
| Mar 13, 2025 | CNM Core & Main, Inc. | AGrant or award Class A Common Stock | +7,296 | $0.00 | $0 | 25,755 | Mar 17, 2025 |
| Mar 13, 2025 | CNM Core & Main, Inc. | AGrant or award Options (Rights to Buy)derivative | +53,094 | $0.00 | $0 | 53,094 | Mar 17, 2025 |
| Mar 11, 2025 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock | -925 | $46.55 | $43k | 18,459 | Mar 13, 2025 |
| Mar 7, 2025 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock | -536 | $47.87 | $26k | 20,380 | Mar 11, 2025 |
| Mar 10, 2025 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock | -996 | $46.69 | $47k | 19,384 | Mar 11, 2025 |
| Mar 13, 2023 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock10b5-1 | -1,054 | $21.45 | $23k | 22,844 | Jan 17, 2025 |
| Mar 11, 2024 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock10b5-1 | -999 | $48.29 | $48k | 21,845 | Jan 17, 2025 |
| Mar 11, 2024 | CNM Core & Main, Inc. | FTax withholding Class A Common Stock10b5-1 | -929 | $48.29 | $45k | 20,916 | Jan 17, 2025 |
Questions about Mark R Witkowski
Answered from the filings on this page, as of the latest one.
Is Mark R Witkowski buying or selling?
Not in the last 12 months. Mark R Witkowski's latest open-market trade on SEC Form 4 was sold $6.4M of CNM on Aug 18, 2025.
How did Mark R Witkowski's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Mark R Witkowski has 0.
Where does Mark R Witkowski file Form 4?
Mark R Witkowski has filed Form 4 at CNM (Core & Main, Inc.) as Chief Executive Officer. 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.