Mark A Mccollum

Insider

First SEC filing: June 5, 2026 · Latest: June 5, 2026

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Insider at Companies where this person is a reporting insider.
Insider transactions Every share this person bought or sold, from Form 4 filings.
Derivatives Options and other derivative holdings reported by this person.
Initial holdings The stakes this person held when they first started reporting.
Compensation Executive pay disclosed in company proxy statements.

Insider at

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 84 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

84 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Aug. 14, 2026	WLK	A	2,184	—	—	2,184 Direct	—	Acquired	(price as of 2026-08-21)
Aug. 8, 2026	WLK	M	2,168	—	—	11,824 Direct	+22.45%	Acquired	(price as of 2026-08-21)
Aug. 8, 2026	WLK	M	2,168	—	—	2,168 Direct	-50.00%	Disposed	(price as of 2026-08-21)
June 3, 2026	SDRL	A	2,618	—	—	2,618 Direct	—	Acquired	(price as of 2026-08-21)
May 20, 2026	OKE	A	1,845	$92.15	$170,017	2,572 Direct	+253.78%	Acquired	2.8% (price as of 2026-08-21)
May 14, 2026	SDRL	M	4,860	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
May 14, 2026	SDRL	M	4,860	—	—	7,269 Direct	+201.74%	Acquired	(price as of 2026-08-21)
Jan. 23, 2026	OKE	A	727	$78.00	$56,706	727 Direct	—	Acquired	21.5% (price as of 2026-08-21)
Aug. 9, 2025	WLK	M	1,128	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Aug. 9, 2025	WLK	M	1,128	—	—	9,656 Direct	+13.23%	Acquired	(price as of 2026-08-21)
Aug. 8, 2025	WLK	A	2,168	—	—	2,168 Direct	—	Acquired	(price as of 2026-08-21)
May 14, 2025	SDRL	A	4,860	—	—	4,860 Direct	—	Acquired	(price as of 2026-08-21)
April 17, 2025	SDRL	M	2,409	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
April 17, 2025	SDRL	M	2,409	—	—	2,409 Direct	—	Acquired	(price as of 2026-08-21)
Aug. 11, 2024	WLK	M	1,136	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Aug. 11, 2024	WLK	M	1,136	—	—	8,528 Direct	+15.37%	Acquired	(price as of 2026-08-21)
Aug. 9, 2024	WLK	A	1,128	—	—	1,128 Direct	—	Acquired	(price as of 2026-08-21)
Aug. 12, 2023	WLK	M	1,446	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Aug. 12, 2023	WLK	M	1,446	—	—	7,392 Direct	+24.32%	Acquired	(price as of 2026-08-21)
Aug. 11, 2023	WLK	A	1,136	—	—	1,136 Direct	—	Acquired	(price as of 2026-08-21)
May 18, 2018	WLK	A	987	—	—	987 Direct	—	Acquired	(price as of 2026-08-21)
April 26, 2018	AROC	A	2,800	—	—	82,751 Direct	+3.50%	Acquired	(price as of 2026-08-21)
March 2, 2018	AROC	A	13,158	—	—	79,951 Direct	+19.70%	Acquired	(price as of 2026-08-21)
March 3, 2017	AROC	A	9,125	—	—	66,793 Direct	+15.82%	Acquired	(price as of 2026-08-21)
Feb. 27, 2017	HAL	M	44,100	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Feb. 27, 2017	HAL	M	33,200	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Feb. 27, 2017	HAL	M	12,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Feb. 27, 2017	HAL	S 10b5-1	44,100	$53.30	$2,350,530	204,993 Direct	-17.70%	Disposed	-33.3% (price as of 2026-08-21)
Feb. 27, 2017	HAL	M	44,100	$33.50	$1,477,350	249,093 Direct	+21.51%	Acquired	6.1% (price as of 2026-08-21)
Feb. 27, 2017	HAL	S 10b5-1	33,200	$53.30	$1,769,560	204,993 Direct	-13.94%	Disposed	-33.3% (price as of 2026-08-21)
Feb. 27, 2017	HAL	M	33,200	$35.57	$1,180,924	238,193 Direct	+16.20%	Acquired	-0.1% (price as of 2026-08-21)
Feb. 27, 2017	HAL	S 10b5-1	12,000	$53.30	$639,600	204,993 Direct	-5.53%	Disposed	-33.3% (price as of 2026-08-21)
Feb. 27, 2017	HAL	M	12,000	$36.90	$442,800	216,993 Direct	+5.85%	Acquired	-3.7% (price as of 2026-08-21)
Dec. 8, 2016	HAL	F	2,711	$54.02	$146,448	204,993 Direct	-1.31%	Disposed	-34.2% (price as of 2026-08-21)
Dec. 7, 2016	HAL	A	30,500	—	—	30,500 Direct	—	Acquired	(price as of 2026-08-21)
Dec. 7, 2016	HAL	A	18,400	$53.54	$985,136	207,704 Direct	+9.72%	Acquired	-33.6% (price as of 2026-08-21)
Dec. 7, 2016	HAL	F	2,677	$53.90	$144,290	189,304 Direct	-1.39%	Disposed	-34.1% (price as of 2026-08-21)
Dec. 6, 2016	HAL	F	6,512	$54.17	$352,755	191,981 Direct	-3.28%	Disposed	-34.4% (price as of 2026-08-21)
March 4, 2016	AROC	A	18,473	—	—	57,668 Direct	+47.13%	Acquired	(price as of 2026-08-21)
Dec. 8, 2015	HAL	D	7,427	$37.90	$281,483	198,493 Direct	-3.61%	Disposed	-6.3% (price as of 2026-08-21)
Dec. 7, 2015	HAL	D	2,098	$38.10	$79,934	205,920 Direct	-1.01%	Disposed	-6.7% (price as of 2026-08-21)
Dec. 3, 2015	HAL	D	2,098	$40.40	$84,759	208,018 Direct	-1.00%	Disposed	-12.1% (price as of 2026-08-21)
Dec. 2, 2015	HAL	A	50,400	—	—	50,400 Direct	—	Acquired	(price as of 2026-08-21)
Dec. 2, 2015	HAL	A	28,300	$38.95	$1,102,285	210,116 Direct	+15.57%	Acquired	-8.8% (price as of 2026-08-21)
March 4, 2015	AROC	A	3,915	—	—	39,195 Direct	+11.10%	Acquired	(price as of 2026-08-21)
Dec. 9, 2014	HAL	D	5,388	$40.37	$217,514	181,816 Direct	-2.88%	Disposed	-12.0% (price as of 2026-08-21)
Dec. 8, 2014	HAL	D	2,039	$40.74	$83,069	187,204 Direct	-1.08%	Disposed	-12.8% (price as of 2026-08-21)
Dec. 3, 2014	HAL	A	46,400	—	—	46,400 Direct	—	Acquired	(price as of 2026-08-21)
Dec. 3, 2014	HAL	D	4,884	$41.21	$201,270	189,243 Direct	-2.52%	Disposed	-13.8% (price as of 2026-08-21)
Dec. 3, 2014	HAL	A	25,000	$40.75	$1,018,750	194,127 Direct	+14.78%	Acquired	-12.8% (price as of 2026-08-21)
July 15, 2014	HAL	A	50,000	$70.26	$3,513,000	169,127 Direct	+41.97%	Acquired	-49.4% (price as of 2026-08-21)
June 20, 2014	HAL	M	40,600	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
June 20, 2014	HAL	S 10b5-1	1,398	$69.64	$97,357	119,127 Direct	-1.16%	Disposed	-49.0% (price as of 2026-08-21)
June 20, 2014	HAL	S 10b5-1	40,600	$69.36	$2,816,016	120,525 Direct	-25.20%	Disposed	-48.8% (price as of 2026-08-21)
June 20, 2014	HAL	M	40,600	$29.35	$1,191,610	161,125 Direct	+33.69%	Acquired	21.1% (price as of 2026-08-21)
May 23, 2014	HAL	S 10b5-1	6,189	$63.56	$393,373	120,525 Direct	-4.88%	Disposed	-44.1% (price as of 2026-08-21)
April 21, 2014	HAL	S 10b5-1	3,177	$61.51	$195,417	126,714 Direct	-2.45%	Disposed	-42.2% (price as of 2026-08-21)
April 3, 2014	HAL	G	4,300	—	—	129,891 Direct	-3.20%	Disposed	(price as of 2026-08-21)
March 21, 2014	HAL	S 10b5-1	4,895	$58.00	$283,910	134,191 Direct	-3.52%	Disposed	-38.7% (price as of 2026-08-21)
March 4, 2014	AROC	A	3,036	—	—	35,280 Direct	+9.42%	Acquired	(price as of 2026-08-21)
Feb. 25, 2014	HAL	S 10b5-1	4,992	$56.00	$279,552	139,086 Direct	-3.46%	Disposed	-36.6% (price as of 2026-08-21)
Dec. 6, 2013	HAL	D	2,711	$50.56	$137,068	144,078 Direct	-1.85%	Disposed	-29.7% (price as of 2026-08-21)
Dec. 5, 2013	HAL	D	2,677	$50.48	$135,135	146,789 Direct	-1.79%	Disposed	-29.6% (price as of 2026-08-21)
Dec. 4, 2013	HAL	A	35,400	$50.62	$1,791,948	35,400 Direct	—	Acquired	-29.8% (price as of 2026-08-21)
Dec. 4, 2013	HAL	A	24,300	$50.62	$1,230,066	149,466 Direct	+19.41%	Acquired	-29.8% (price as of 2026-08-21)
Dec. 2, 2013	HAL	D	4,086	$52.01	$212,513	125,166 Direct	-3.16%	Disposed	-31.7% (price as of 2026-08-21)
Nov. 29, 2013	HAL	D	3,409	$52.68	$179,586	129,252 Direct	-2.57%	Disposed	-32.6% (price as of 2026-08-21)
Sept. 16, 2013	HAL	M	13,400	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Sept. 16, 2013	HAL	M	7,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Sept. 16, 2013	HAL	S 10b5-1	13,400	$49.96	$669,464	132,661 Direct	-9.17%	Disposed	-28.9% (price as of 2026-08-21)
Sept. 16, 2013	HAL	M	13,400	$33.17	$444,478	146,061 Direct	+10.10%	Acquired	7.1% (price as of 2026-08-21)
Sept. 16, 2013	HAL	S 10b5-1	7,000	$49.88	$349,160	132,661 Direct	-5.01%	Disposed	-28.8% (price as of 2026-08-21)
Sept. 16, 2013	HAL	M	7,000	$32.39	$226,730	139,661 Direct	+5.28%	Acquired	9.7% (price as of 2026-08-21)
Sept. 16, 2013	HAL	S 10b5-1	32,000	$50.15	$1,604,800	132,661 Direct	-19.43%	Disposed	-29.2% (price as of 2026-08-21)
March 4, 2013	AROC	A	4,393	—	—	32,244 Direct	+15.77%	Acquired	(price as of 2026-08-21)
Feb. 13, 2013	HAL	D	580	$40.84	$23,687	164,661 Direct	-0.35%	Disposed	-13.0% (price as of 2026-08-21)
Dec. 6, 2012	HAL	D	2,355	$33.58	$79,081	165,241 Direct	-1.41%	Disposed	5.8% (price as of 2026-08-21)
Dec. 5, 2012	HAL	A	44,100	$33.50	$1,477,350	44,100 Direct	—	Acquired	6.1% (price as of 2026-08-21)
Dec. 5, 2012	HAL	D	802	$33.50	$26,867	167,596 Direct	-0.48%	Disposed	6.1% (price as of 2026-08-21)
Dec. 5, 2012	HAL	A	31,900	$33.50	$1,068,650	168,398 Direct	+23.37%	Acquired	6.1% (price as of 2026-08-21)
Nov. 30, 2012	HAL	D	7,795	$33.35	$259,963	136,498 Direct	-5.40%	Disposed	6.5% (price as of 2026-08-21)
May 14, 2012	HAL	M	16,800	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
May 14, 2012	HAL	S 10b5-1	7,600	$31.37	$238,412	144,293 Direct	-5.00%	Disposed	13.3% (price as of 2026-08-21)
May 14, 2012	HAL	S 10b5-1	9,200	$31.26	$287,592	151,893 Direct	-5.71%	Disposed	13.7% (price as of 2026-08-21)
May 14, 2012	HAL	M	16,800	$15.42	$259,056	161,093 Direct	+11.64%	Acquired	130.4% (price as of 2026-08-21)
March 4, 2012	AROC	A	7,660	—	—	27,851 Direct	+37.94%	Acquired	(price as of 2026-08-21)
Feb. 13, 2012	HAL	D	751	$36.14	$27,141	144,293 Direct	-0.52%	Disposed	-1.7% (price as of 2026-08-21)
Feb. 13, 2012	HAL	D	838	$36.14	$30,285	144,784 Direct	-0.58%	Disposed	-1.7% (price as of 2026-08-21)
Feb. 13, 2012	HAL	D	578	$36.14	$20,889	145,044 Direct	-0.40%	Disposed	-1.7% (price as of 2026-08-21)
Dec. 6, 2011	HAL	A	33,200	$35.57	$1,180,924	33,200 Direct	—	Acquired	-0.1% (price as of 2026-08-21)
Dec. 6, 2011	HAL	D	474	$35.57	$16,860	145,622 Direct	-0.32%	Disposed	-0.1% (price as of 2026-08-21)
Dec. 6, 2011	HAL	A	25,800	$35.57	$917,706	146,096 Direct	+21.45%	Acquired	-0.1% (price as of 2026-08-21)
Dec. 5, 2011	HAL	D	802	$37.02	$29,690	120,296 Direct	-0.66%	Disposed	-4.0% (price as of 2026-08-21)
Dec. 2, 2011	HAL	D	3,551	$36.58	$129,896	121,098 Direct	-2.85%	Disposed	-2.9% (price as of 2026-08-21)
Dec. 1, 2011	HAL	D	4,244	$36.41	$154,524	124,649 Direct	-3.29%	Disposed	-2.4% (price as of 2026-08-21)
March 31, 2011	HAL	S 10b5-1	10,000	$50.00	$500,000	128,893 Direct	-7.20%	Disposed	-28.9% (price as of 2026-08-21)
March 8, 2011	HAL	M	9,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
March 8, 2011	HAL	M	13,332	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
March 8, 2011	HAL	M	33,600	—	—	16,800 Direct	-66.67%	Disposed	(price as of 2026-08-21)
March 8, 2011	HAL	S 10b5-1	33,600	$45.50	$1,528,800	138,893 Direct	-19.48%	Disposed	-21.9% (price as of 2026-08-21)

Showing latest 100 of 160 transactions

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
Aug. 14, 2026	WLK	Restricted Stock Units	Common Stock (2,184)	—	—	2,184	Acquired
Aug. 8, 2026	WLK	Restricted Stock Units	Common Stock (2,168)	—	—	2,168	Disposed
June 3, 2026	SDRL	Restricted Stock Units	Common Shares (2,618)	—	—	2,618	Acquired
May 14, 2026	SDRL	Restricted Stock Units	Common Shares (4,860)	—	—	4,860	Disposed
Aug. 9, 2025	WLK	Restricted Stock Units	Common Stock (1,128)	—	—	1,128	Disposed
Aug. 8, 2025	WLK	Restricted Stock Units	Common Stock (2,168)	—	—	2,168	Acquired
May 14, 2025	SDRL	Restricted Stock Units	Common Shares (4,860)	—	—	4,860	Acquired
April 17, 2025	SDRL	Restricted Stock Units	Common Shares (2,409)	—	—	2,409	Disposed
Aug. 11, 2024	WLK	Restricted Stock Units	Common Stock (1,136)	—	—	1,136	Disposed
Aug. 9, 2024	WLK	Restricted Stock Units	Common Stock (1,128)	—	—	1,128	Acquired
Aug. 12, 2023	WLK	Restricted Stock Units	Common Stock (1,446)	—	—	1,446	Disposed
Aug. 11, 2023	WLK	Restricted Stock Units	Common Stock (1,136)	—	—	1,136	Acquired
May 18, 2018	WLK	Restricted Stock Units	Common Stock (987)	—	—	987	Acquired
Feb. 27, 2017	HAL	Option to Buy Common Stock	Common Stock (44,100)	$33.50	Dec. 5, 2022	44,100	Disposed
Feb. 27, 2017	HAL	Option to Buy Common Stock	Common Stock (33,200)	$35.57	Dec. 6, 2021	33,200	Disposed
Feb. 27, 2017	HAL	Option to Buy Common Stock	Common Stock (12,000)	$36.90	Dec. 5, 2017	12,000	Disposed
Dec. 7, 2016	HAL	Option to Buy Common Stock	Common Stock (30,500)	$53.54	Dec. 7, 2026	30,500	Acquired
Dec. 2, 2015	HAL	Option to Buy Common Stock	Common Stock (50,400)	$38.95	Dec. 2, 2025	50,400	Acquired
Dec. 3, 2014	HAL	Option to Buy Common Stock	Common Stock (46,400)	$40.75	Dec. 3, 2024	46,400	Acquired
June 20, 2014	HAL	Option to Buy Common Stock	Common Stock (40,600)	$29.35	Dec. 1, 2019	40,600	Disposed
Dec. 4, 2013	HAL	Option to Buy Common Stock	Common Stock (35,400)	$50.62	Dec. 4, 2023	35,400	Acquired
Sept. 16, 2013	HAL	Option to Buy Common Stock	Common Stock (13,400)	$33.17	Dec. 6, 2016	13,400	Disposed
Sept. 16, 2013	HAL	Option to Buy Common Stock	Common Stock (7,000)	$32.39	Dec. 7, 2015	7,000	Disposed
Dec. 5, 2012	HAL	Option to Buy Common Stock	Common Stock (44,100)	$33.50	Dec. 5, 2022	44,100	Acquired
May 14, 2012	HAL	Option to Buy Common Stock	Common Stock (16,800)	$15.42	Dec. 2, 2018	16,800	Disposed
Dec. 6, 2011	HAL	Option to Buy Common Stock	Common Stock (33,200)	$35.57	Dec. 6, 2021	33,200	Acquired
March 8, 2011	HAL	Option to Buy Common Stock	Common Stock (9,000)	$19.31	Dec. 2, 2014	9,000	Disposed
March 8, 2011	HAL	Option to Buy Common Stock	Common Stock (13,332)	$12.16	Sept. 10, 2013	13,332	Disposed
March 8, 2011	HAL	Option to Buy Common Stock	Common Stock (50,400)	$15.42	Dec. 2, 2018	33,600	Disposed
Dec. 1, 2010	HAL	Option to Buy Common Stock	Common Stock (28,100)	$39.19	Dec. 1, 2020	28,100	Acquired
Dec. 1, 2009	HAL	Option to Buy Common Stock	Common Stock (40,600)	$29.35	Dec. 1, 2019	40,600	Acquired
Dec. 2, 2008	HAL	Option to Buy Common Stock	Common Stock (50,400)	$15.42	Dec. 2, 2018	50,400	Acquired
Feb. 13, 2008	HAL	Option to Buy Common Stock	Common Stock (11,500)	$35.67	Feb. 13, 2018	11,500	Acquired
Dec. 5, 2007	HAL	Option to Buy Common Stock	Common Stock (12,000)	$36.90	Dec. 5, 2017	12,000	Acquired
Dec. 6, 2006	HAL	Option to Buy Common Stock	Common Stock (13,400)	$33.17	Dec. 6, 2016	13,400	Acquired
Dec. 7, 2005	HAL	Option to Buy Common Stock	Common Stock (3,500)	$64.78	Dec. 7, 2015	3,500	Acquired
Nov. 14, 2005	HAL	Option to Buy Common Stock	Common Stock (13,334)	$24.33	Sept. 10, 2013	13,334	Disposed
Dec. 2, 2004	HAL	Option to Buy Common Stock	Common Stock (4,500)	$38.61	Dec. 2, 2014	4,500	Acquired
Sept. 10, 2003	HAL	Option to Buy Common Stock	Common Stock (20,000)	$24.33	Sept. 10, 2013	20,000	Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Initial ownership (Form 3) 3 holdings

Securities held when first becoming an insider, per SEC Form 3.

Date	Ticker	Security	Shares	Ownership
Jan. 2, 2025	SDRL	Restricted Stock Units→ Common Shares (2,409)	2,409	Direct
April 25, 2017	WFRD	Ordinary Shares	0	Direct
Nov. 15, 2006	KBR	No securities are beneficially owned	0	Direct

Compensation (DEF 14A)

Matched by name from proxy statements (DEF 14A) — verify against the filing.

HAL

Fiscal year	Salary	Bonus	Stock awards	Option awards	Non-equity incentive	Pension change	Other	Total
2017	$150,000	$0	—	—	$0	$183,278	$124,867	$458,145
2014	$760,000	$0	—	—	$2,769,000	$43,427	$491,054	$9,162,703
2013	$732,000	$0	—	—	$2,679,877	$22,366	$470,366	$5,746,033

WFRD

Fiscal year	Salary	Bonus	Stock awards	Option awards	Non-equity incentive	Pension change	Other	Total
2019	$1,000,000	—	—	—	$5,367,875	—	$236,428	$6,604,303

Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.