Insider · CIK 0001215888
Mark A McCollum
Files at: WLK, SDRL, WFRD, AROC, HAL. On EDGAR ↗
Reported trades — common stock
| Trade | Reported (ET) | Company | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Aug 8, 2026 MForm 4 → | Aug 10, 1:52 pm EDT | WESTLAKE CORPWLK | 2,168 | — | — | 11,824 | — | |
| Jan 31, 2019 FForm 4 → | Feb 4, 4:49 pm EST | Weatherford International plcWFT | 73,253 | $0.64 | $46,882 | 1,791,507 | — | plan? |
| Apr 26, 2018 AForm 4 → | Apr 27, 10:44 am EDT | Archrock, Inc.AROC | 2,800 | — | — | 82,751 | — | plan? |
| Apr 24, 2018 FForm 4 → | Apr 26, 4:11 pm EDT | Weatherford International plcWFT | 77,903 | $2.59 | $201,769 | 1,864,760 | — | plan? |
| Mar 2, 2018 AForm 4 → | Mar 5, 6:18 pm EST | Archrock, Inc.AROC | 13,158 | — | — | 79,951 | — | plan? |
| Jan 31, 2018 AForm 4 → | Feb 2, 4:43 pm EST | Weatherford International plcWFT | 845,771 | — | — | 1,942,663 | — | plan? |
| Apr 24, 2017 AForm 4 → | Apr 25, 4:31 pm EDT | Weatherford International plcWFT | 1,096,892 | — | — | 1,096,892 | — | plan? |
| Mar 3, 2017 AForm 4 → | Mar 6, 11:07 am EST | Archrock, Inc.AROC | 9,125 | — | — | 66,793 | — | plan? |
| Feb 27, 2017 SForm 4 → | Mar 1, 3:08 pm EST | HALLIBURTON COHAL | 89,300 | $53.30 | $4,760,047 | 204,993 | −30.3% | plan? |
| Feb 27, 2017 MForm 4 → | Mar 1, 3:08 pm EST | HALLIBURTON COHAL | 89,300 | $34.73 | $3,101,074 | 249,093 | — | plan? |
| Dec 7, 2016 AFForm 4 → | Dec 9, 3:26 pm EST | HALLIBURTON COHAL | 21,111 | $53.60 | $1,131,584 | 204,993 | — | plan? |
| Dec 6, 2016 FForm 4 → | Dec 8, 4:02 pm EST | HALLIBURTON COHAL | 9,189 | $54.09 | $497,045 | 189,304 | — | plan? |
| Mar 4, 2016 AForm 4 → | Mar 7, 6:32 pm EST | Archrock, Inc.AROC | 18,473 | — | — | 57,668 | — | plan? |
| Dec 8, 2015 DForm 4 → | Dec 10, 11:56 am EST | HALLIBURTON COHAL | 7,427 | $37.90 | $281,483 | 198,493 | — | plan? |
| Dec 7, 2015 DForm 4 → | Dec 9, 3:33 pm EST | HALLIBURTON COHAL | 2,098 | $38.10 | $79,934 | 205,920 | — | plan? |
| Dec 3, 2015 DForm 4 → | Dec 7, 3:19 pm EST | HALLIBURTON COHAL | 2,098 | $40.40 | $84,759 | 208,018 | — | plan? |
| Dec 2, 2015 AForm 4 → | Dec 4, 4:56 pm EST | HALLIBURTON COHAL | 28,300 | $38.95 | $1,102,285 | 210,116 | — | plan? |
| Mar 4, 2015 AForm 4 → | Mar 5, 2:13 pm EST | EXTERRAN HOLDINGS INC.EXH | 3,915 | — | — | 39,195 | — | plan? |
Reported trades — derivatives (options, RSUs, warrants)
| Trade | Reported (ET) | Company | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Aug 14, 2026 AForm 4 → | Aug 17, 12:27 pm EDT | WESTLAKE CORPWLK | 2,184 | — | — | 2,184 | — | |
| Aug 8, 2026 MForm 4 → | Aug 10, 1:52 pm EDT | WESTLAKE CORPWLK | 2,168 | — | — | 2,168 | — | |
| Jun 3, 2026 AForm 4 → | Jun 5, 11:54 am EDT | SEADRILL LtdSDRL | 2,618 | — | — | 2,618 | — | |
| Aug 17, 2018 AForm 4 → | Aug 20, 10:52 am EDT | WESTLAKE CHEMICAL CORPWLK | 1,409 | — | — | 1,409 | — | |
| May 18, 2018 AForm 4 → | May 21, 9:57 am EDT | WESTLAKE CHEMICAL CORPWLK | 987 | — | — | 987 | — | |
| Apr 24, 2017 AForm 4 → | Apr 25, 4:31 pm EDT | Weatherford International plcWFT | 548,446 | — | — | 548,446 | — | |
| Feb 27, 2017 MForm 4 → | Mar 1, 3:08 pm EST | HALLIBURTON COHAL | 89,300 | — | — | 0 | — | |
| Dec 7, 2016 AForm 4 → | Dec 9, 3:26 pm EST | HALLIBURTON COHAL | 30,500 | — | — | 30,500 | — | |
| Dec 2, 2015 AForm 4 → | Dec 4, 4:56 pm EST | HALLIBURTON COHAL | 50,400 | — | — | 50,400 | — |