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 | $65.47 | $774.1K | $0 | 13 | 2026-08-17 |
| SDRL | Director | 7,269 | $51.73 | $376.0K | $0 | 4 | 2026-06-05 |
| OKE | Director | 2,572 | $96.45 | $248.1K | $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 | $30.75 | $2.55M | $0 | 4 | 2018-04-27 |
| HAL | EVP - Chief Financial Officer | 204,993 | $35.49 | $7.28M | -$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 3 of 9
89 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2019-08-19 | WLK | Mixed | +1,409 | $0 | EDGAR |
| 2019-05-20 | WLK | Exer (M) | +987 | $0 | EDGAR |
| 2019-04-25 | Weatherford International plc (WFT) Delisted | Tax (F) | −125,892 | -$79.3K | EDGAR |
| 2019-02-04 | Weatherford International plc (WFT) Delisted | Tax (F) | −73,253 | -$46.9K | EDGAR |
| 2018-08-20 | WLK | Grant (A) | — | $0 | EDGAR |
| 2018-05-21 | WLK | Grant (A) | — | $0 | EDGAR |
| 2018-04-27 | AROC | Grant (A) | +2,800 | $0 | EDGAR |
| 2018-04-26 | Weatherford International plc (WFT) Delisted | Tax (F) | −77,903 | -$201.8K | EDGAR |
| 2018-03-05 | AROC | Grant (A) | +13,158 | $0 | EDGAR |
| 2018-02-02 | Weatherford International plc (WFT) Delisted | Grant (A) | +845,771 | $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.