Transactions
4
Insider / Core & Main, Inc.
Whittenburg Mark G
General Counsel and Secretary at Core & Main, Inc.
- Company
- Core & Main, Inc.
- Ticker
- CNM
- First filing on record
- January 2, 2026
- Latest trade on record
- March 11, 2026
- SEC filings
- EDGAR ↗
Whittenburg Mark G, General Counsel and Secretary at Core & Main, Inc., has disclosed 4 transactions in CNM since January 2, 2026: 0 purchases (0 open-market buys) and 3 sales, worth about $58K at the reported prices. The latest was filed March 13, 2026, 2 days after the trade.
Open-market buys
0
Sales
3
Avg. disclosure lag
1.8d
Trading in charts
Trade timeline
When does this person trade, how big, and in which direction? Every trade in the last 12 months.
Bought (above the line)Sold (below the line)Other transaction
In the last 12 months Whittenburg Mark G made no purchases and 3 sales worth $58K, plus 1 other transaction. Dot size is the dollar amount.
Portfolio mix
Which stocks does this person trade most? Tile size is dollars traded, all time on record.
Whittenburg Mark G has traded 1 stock on record; the largest by dollars is CNM.
Reporting lag
Does this person report on time? One bar per filing against the Form 4 deadline.
On timeLate
0 of 3 filings on record were reported after the Form 4 deadline (two business days, counted here as 4 calendar days).
What kind of transactions
Most Form 4 rows are pay arriving or tax being withheld, not a decision to buy or sell. Only code P is an open-market purchase and code S an open-market sale. What each code means: Form 4 transaction codes.
| Code | Meaning | Rows | Shares | Value |
|---|---|---|---|---|
| F | Shares withheld for tax | 3 | 1,166 | $58K |
| G | Gift | 1 | 25,500 | — |
| Year | Rows | Bought | Sold |
|---|---|---|---|
| 2026 | 3 | 0 | 3 · $58K |
| 2025 | 1 | 0 | 0 |
Transactions
| Security | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|
| CNM | Sell F | March 11, 2026 | March 13, 2026 | 2d | 331 | $49 | $16K | Form 4 ↗ | ||
| CNM | Sell F | March 10, 2026 | March 11, 2026 | 1d | 557 | $49 | $28K | Form 4 ↗ | ||
| CNM | Sell F | March 9, 2026 | March 11, 2026 | 2d | 278 | $50 | $14K | Form 4 ↗ | ||
| CNM | Other G | December 31, 2025 | January 2, 2026 | 2d | 25,500 | — | — | indirectderivative | Form 4 ↗ |
Filings
| Filed | Form | Accession | Rows | Status | Source |
|---|---|---|---|---|---|
| March 13, 2026 | Form 4 | 0001856525-26-000025 | 1 | published | EDGAR ↗ |
| March 11, 2026 | Form 4 | 0001856525-26-000010 | 2 | published | EDGAR ↗ |
| January 2, 2026 | Form 4 | 0001866737-26-000002 | 1 | published | EDGAR ↗ |
Other insiders at Core & Main, Inc.
- Bradbury Robyn L Chief Financial Officer 11 rows
- Harper Carla D Senior VP, Human Resources 7 rows
- LeClair Stephen O Director 7 rows
- Witkowski Mark R Chief Executive Officer 6 rows
- Cowles Bradford A President 5 rows
- HUEBERT MICHAEL G. President 5 rows
- Stephens John Weldon Chief Accounting Officer 5 rows
- Giles Jeffrey D EVP, Corporate Development 4 rows
- Hope James D Director 4 rows
- Hardwick M Susan Director 3 rows
Everyone on file, with contracts and lobbying under the company's name: Core & Main, Inc..
Guides for this page
- What is SEC Form 4? Who files: officers, directors and owners of more than 10% of a class of the company's shares.
- Form 4 transaction codes P = purchase. S = sale. These are the two market trades.
- Insider buying vs insider selling Selling outweighs buying by a wide margin in normal times.
- Options and derivatives on Form 4 Table I = shares. Table II = options and other derivatives.
- What disclosure data cannot tell you Filings are late by design: up to 45 days for Congress, two business days for insiders.
Sources and method
| Source | Filings | Rows | First filed | Newest filed | Read the originals |
|---|---|---|---|---|---|
| SEC EDGAR, Form 4 | 3 | 4 | January 2, 2026 | March 13, 2026 | Form 4 list on EDGAR |
Site built October 22, 2026. Every row in the tables above links to its own filing. To quote a figure, use the Cite button at the top of the page; see how to cite and reuse.
Every row comes from the reporting owner's Form 4 as filed with the SEC (EDGAR ownership XML), read daily. "Value" is shares × the reported price; code P is an open-market purchase, S a sale, M an option exercise, A a grant. The lag is the filing date minus the trade date; Form 4 is due within two business days. Amendments (4/A) are not merged. Details on the methodology page; report an error on corrections.
Not investment advice. Figures are public disclosures shown as filed; they may lag the trade and may be amended later. No recommendation is made or implied.