David K Lockett

Insider

First SEC filing: June 27, 2008 · Latest: June 27, 2008

On this page

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.

Insider at

CRK selling May 17, 2010

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 33 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

33 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 7, 2016	CRK	A	25,000	—	—	119,255 Direct	+26.52%	Acquired	(price as of 2026-08-20)
May 7, 2015	CRK	A	27,412	—	—	94,255 Direct	+41.01%	Acquired	(price as of 2026-08-20)
May 8, 2014	CRK	A	4,887	—	—	66,843 Direct	+7.89%	Acquired	(price as of 2026-08-20)
May 7, 2013	CRK	A	8,820	—	—	61,956 Direct	+16.60%	Acquired	(price as of 2026-08-20)
May 8, 2012	CRK	A	10,100	—	—	53,136 Direct	+23.47%	Acquired	(price as of 2026-08-20)
May 3, 2012	CRK	J	10,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 17, 2011	CRK	A	6,500	—	—	43,036 Direct	+17.79%	Acquired	(price as of 2026-08-20)
May 10, 2011	CRK	J	10,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 18, 2010	CRK	A	9,000	—	—	36,536 Direct	+32.68%	Acquired	(price as of 2026-08-20)
May 17, 2010	CRK	S	5,000	$30.23	$151,150	27,536 Direct	-15.37%	Disposed	-90.8% (price as of 2026-08-20)
May 16, 2010	CRK	M	5,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 16, 2010	CRK	M	5,000	$20.92	$104,600	32,536 Direct	+18.16%	Acquired	-86.7% (price as of 2026-08-20)
May 19, 2009	CRK	A	24,000	—	—	27,536 Direct	+678.73%	Acquired	(price as of 2026-08-20)
June 27, 2008	CRK	M	5,000	—	—	5,000 Direct	-50.00%	Disposed	(price as of 2026-08-20)
June 27, 2008	CRK	M	5,000	$78.34	$391,700	3,536 Direct	-58.58%	Disposed	-96.4% (price as of 2026-08-20)
June 27, 2008	CRK	M	5,000	$20.92	$104,600	8,536 Direct	+141.40%	Acquired	-86.7% (price as of 2026-08-20)
June 6, 2008	CRK	M	10,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
June 6, 2008	CRK	M	10,000	$63.50	$635,000	3,536 Direct	-73.88%	Disposed	-95.6% (price as of 2026-08-20)
June 6, 2008	CRK	M	10,000	$18.17	$181,700	13,536 Direct	+282.81%	Acquired	-84.7% (price as of 2026-08-20)
May 13, 2008	CRK	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-20)
May 3, 2007	CRK	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-20)
Dec. 18, 2006	CRK	M	10,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Dec. 18, 2006	CRK	M	10,000	$32.54	$325,400	3,536 Direct	-73.88%	Disposed	-91.5% (price as of 2026-08-20)
Dec. 18, 2006	CRK	M	10,000	$12.15	$121,500	13,536 Direct	+282.81%	Acquired	-77.1% (price as of 2026-08-20)
May 10, 2006	CRK	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-20)
Sept. 12, 2005	CRK	M	10,000	$7.40	$74,000	13,536 Direct	+282.81%	Acquired	-62.4% (price as of 2026-08-20)
Sept. 12, 2005	CRK	M	10,000	$8.70	$87,000	23,536 Direct	+73.88%	Acquired	-68.0% (price as of 2026-08-20)
Sept. 12, 2005	CRK	M	20,000	$30.65	$613,000	3,536 Direct	-84.98%	Disposed	-90.9% (price as of 2026-08-20)
Sept. 12, 2005	CRK	M	10,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Sept. 12, 2005	CRK	M	10,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 16, 2005	CRK	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-20)
Nov. 1, 2004	CRK	P	100	$21.98	$2,198	3,536 Direct	+2.91%	Acquired	-87.3% (price as of 2026-08-20)
Sept. 22, 2004	CRK	P	200	$20.09	$4,018	3,436 Direct	+6.18%	Acquired	-86.2% (price as of 2026-08-20)
Aug. 26, 2004	CRK	P	900	$17.02	$15,318	3,236 Direct	+38.53%	Acquired	-83.7% (price as of 2026-08-20)
May 10, 2004	CRK	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-20)
Dec. 20, 2003	CRK	M	10,000	$19.16	$191,600	2,336 Direct	-81.06%	Disposed	-85.5% (price as of 2026-08-20)
Dec. 20, 2003	CRK	M	10,000	—	—	— Direct	—	Disposed	(price as of 2026-08-20)

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
May 3, 2012	CRK	Directors Stock Options - 2007	Common Stock (10,000)	$29.49	May 3, 2012	10,000	Disposed
May 10, 2011	CRK	Directors Stock Options - 2006	Common Stock (0)	$32.44	May 10, 2011	10,000	Disposed
May 16, 2010	CRK	Directors Stock Options - 2005	Common Stock (5,000)	$20.92	May 16, 2010	5,000	Disposed
June 27, 2008	CRK	Directors Stock Options - 2005	Common Stock (5,000)	$20.92	May 16, 2010	5,000	Disposed
June 6, 2008	CRK	Directors Stock Options - 2004	Common Stock (10,000)	$18.17	June 1, 2009	10,000	Disposed
May 13, 2008	CRK	Directors Stock Options - 2008	Common Stock (10,000)	$54.36	May 13, 2013	10,000	Acquired
May 3, 2007	CRK	Directors Stock Options - 2007	Common Stock (10,000)	$29.49	May 3, 2012	10,000	Acquired
Dec. 18, 2006	CRK	Directors Stock Options - 2003	Common Stock (10,000)	$12.15	June 1, 2008	10,000	Disposed
May 10, 2006	CRK	Directors Stock Options - 2006	Common Stock (10,000)	$32.44	May 10, 2012	10,000	Acquired
Sept. 12, 2005	CRK	Directors Stock Options - 2001	Common Stock (10,000)	$7.40	Aug. 1, 2006	10,000	Disposed
Sept. 12, 2005	CRK	Directors Stock Options - 2002	Common Stock (10,000)	$8.70	June 1, 2007	10,000	Disposed
May 16, 2005	CRK	Directors Stock Options - 2005	Common Stock (10,000)	$20.92	May 16, 2010	10,000	Acquired
May 10, 2004	CRK	Directors Stock Options - 2004	Common Stock (10,000)	$18.17	June 1, 2009	10,000	Acquired
Dec. 20, 2003	CRK	—	Common Stock (10,000)	$7.40	Aug. 1, 2006	10,000	Disposed

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