Mark G Whittenburg
CIK 1866737 · General Counsel and Secretary · last filed 2026-03-13
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
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Disclosed Exposure
$358.6K
Companies
1
Total Filings
26
Lifetime Open-Market Net
-$16.91M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| CNM | General Counsel and Secretary | 8,525 | $42.07 | $358.6K | -$16.91M | 20 | 2026-03-13 |
Recent Filings · Page 2 of 3
26 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2025-03-11 | CNM | Tax (F) | −877 | -$41.3K | EDGAR |
| 2025-01-17 | CNM | Mixed | — | -$2.76M | EDGAR |
| 2025-01-14 | CNM | Mixed | −5,266 | -$2.59M | EDGAR |
| 2025-01-10 | CNM | Notice (144) | −150,000 | -$7.63M | EDGAR |
| 2024-04-23 | CNM | Mixed | — | -$2.70M | EDGAR |
| 2024-03-26 | CNM | Mixed | −60 | -$2.90M | EDGAR |
| 2024-03-22 | CNM | Notice (144) | −100,000 | -$5.79M | EDGAR |
| 2024-03-11 | CNM | Grant (A) | +2,421 | $0 | EDGAR |
| 2023-04-17 | CNM | Mixed | — | -$781.8K | EDGAR |
| 2023-03-14 | CNM | Grant (A) | +5,226 | $0 | EDGAR |
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.