MARK A MCCOLLUM
CIK 1215888 · President and CEO · last filed 2026-08-17
MARK A MCCOLLUM is a President and CEO who has filed 89 SEC Form 4 insider transactions across 9 companies since 2007. The most recent filing, for WLK, was dated Aug 17, 2026. Across all open-market trades the lifetime net is −$12.0M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $11.5M across reported positions. 53 SEC filings were submitted jointly with CO HALLIBURTON.
"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.
$11.49M
9
89
-$11.99M
Filer Profile
HOUSTON, TX 77002
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| WLK | Director | 11,824 | $70.81 | $837.3K | $0 | 13 | 2026-08-17 |
| SDRL | Director | 7,269 | $47.90 | $348.2K | $0 | 4 | 2026-06-05 |
| OKE | Director | 2,572 | $96.62 | $248.5K | $0 | 2 | 2026-05-22 |
| MARATHON OIL CORP (MRO) Delisted | Director | 0 | $28.55 | $0 | $0 | 4 | 2024-11-22 |
| Weatherford International plc (WFT) Delisted | President and CEO | 1,665,615 | — | — | $0 | 5 | 2019-04-25 |
| AROC | Director | 82,751 | $32.77 | $2.71M | $0 | 4 | 2018-04-27 |
| HAL | EVP - Chief Financial Officer | 204,993 | $35.84 | $7.35M | -$11.99M | 45 | 2017-03-01 |
| Archrock, Inc. (EXH) Delisted | Director | 39,195 | — | — | $0 | 7 | 2015-03-05 |
| Archrock Partners, L.P. (EXLP) Delisted | Director | 2,000 | — | — | $0 | 4 | 2009-06-01 |
Recent Filings
89 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-08-17 | WLK | Grant (A) | — | $0 | EDGAR |
| 2026-08-10 | WLK | Exer (M) | +2,168 | $0 | EDGAR |
| 2026-06-05 | SDRL | Grant (A) | — | $0 | EDGAR |
| 2026-05-22 | OKE | Grant (A) | +1,845 | $170.0K | EDGAR |
| 2026-05-18 | SDRL | Exer (M) | +4,860 | $0 | EDGAR |
| 2026-01-27 | OKE | Grant (A) | +727 | $56.7K | EDGAR |
| 2025-08-11 | WLK | Mixed | +1,128 | $0 | EDGAR |
| 2025-05-16 | SDRL | Grant (A) | — | $0 | EDGAR |
| 2025-04-21 | SDRL | Exer (M) | +2,409 | $0 | EDGAR |
| 2024-11-22 | MARATHON OIL CORP (MRO) Delisted | Disp (D) | −16,299 | $0 | EDGAR |
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.