Mark A McCollum
CIK 1215888 · President and CEO · last filed 2026-08-17
"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.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
HAL price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
HOUSTON, TX 77002
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| WLK | Director | 11,824 | $65.31 | $772.2K | $0 | 13 | 2026-08-17 |
| SDRL | Director | 7,269 | $51.95 | $377.6K | $0 | 4 | 2026-06-05 |
| OKE | Director | 2,572 | $96.36 | $247.8K | $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 | $29.97 | $2.48M | $0 | 4 | 2018-04-27 |
| HAL | EVP - Chief Financial Officer | 204,993 | $35.44 | $7.26M | -$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 · Page 2 of 9
89 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2024-08-12 | WLK | Mixed | +1,136 | $0 | EDGAR |
| 2024-03-05 | MARATHON OIL CORP (MRO) Delisted | Grant (A) | +8,130 | $0 | EDGAR |
| 2023-08-14 | WLK | Mixed | +1,446 | $0 | EDGAR |
| 2023-03-03 | MARATHON OIL CORP (MRO) Delisted | Grant (A) | +7,754 | $0 | EDGAR |
| 2022-12-02 | MARATHON OIL CORP (MRO) Delisted | Grant (A) | +415 | $0 | EDGAR |
| 2022-08-15 | WLK | Mixed | +1,763 | $0 | EDGAR |
| 2022-03-04 | WLK | Gift (G) | −3,000 | $0 | EDGAR |
| 2021-08-16 | WLK | Mixed | +2,400 | $0 | EDGAR |
| 2020-08-17 | WLK | Mixed | +2,387 | $0 | EDGAR |
| 2019-12-17 | — | Mixed | −1,663,874 | $13.2K |
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.