Richard M Libenson

Insider

First SEC filing: Oct. 1, 2018 · Latest: Oct. 1, 2018

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

COST selling Oct. 30, 2019

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 65 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

65 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Oct. 22, 2021	COST	A	561	—	—	3,561 Direct	+18.70%	Acquired	(price as of 2026-08-20)
Dec. 11, 2020	COST	A	34	—	—	3,000 Direct	+1.15%	Acquired	(price as of 2026-08-20)
Oct. 22, 2020	COST	A	719	—	—	2,966 Direct	+32.00%	Acquired	(price as of 2026-08-20)
Oct. 30, 2019	COST	S	1,703	$298.25	$507,920	38,682 Indirect	-4.22%	Disposed	214.3% (price as of 2026-08-20)
Oct. 25, 2019	COST	J	1,703	—	—	40,385 Indirect	+4.40%	Acquired	(price as of 2026-08-20)
Oct. 25, 2019	COST	J	1,703	—	—	2,247 Direct	-43.11%	Disposed	(price as of 2026-08-20)
Oct. 22, 2019	COST	A	901	—	—	3,950 Direct	+29.55%	Acquired	(price as of 2026-08-20)
Oct. 25, 2018	COST	S	2,049	$224.00	$458,976	38,682 Indirect	-5.03%	Disposed	318.5% (price as of 2026-08-20)
Oct. 22, 2018	COST	J	2,049	—	—	40,731 Indirect	+5.30%	Acquired	(price as of 2026-08-20)
Oct. 22, 2018	COST	J	2,049	—	—	3,049 Direct	-40.19%	Disposed	(price as of 2026-08-20)
Oct. 22, 2018	COST	A	1,179	—	—	5,098 Direct	+30.08%	Acquired	(price as of 2026-08-20)
Dec. 18, 2017	COST	S	20,000	$193.03	$3,860,600	38,317 Indirect	-34.30%	Disposed	385.7% (price as of 2026-08-20)
Oct. 24, 2017	COST	S	2,350	$162.00	$380,700	36,928 Indirect	-5.98%	Disposed	478.7% (price as of 2026-08-20)
Oct. 24, 2017	COST	J	2,350	—	—	39,278 Indirect	+6.36%	Acquired	(price as of 2026-08-20)
Oct. 24, 2017	COST	J	2,350	—	—	4,109 Direct	-36.38%	Disposed	(price as of 2026-08-20)
Oct. 24, 2017	COST	S	2,350	$162.00	$380,700	4,109 Direct	-36.38%	Disposed	478.7% (price as of 2026-08-20)
Oct. 22, 2017	COST	A	1,680	—	—	6,269 Direct	+36.61%	Acquired	(price as of 2026-08-20)
Oct. 22, 2017	COST	A	1,870	—	—	6,459 Direct	+40.75%	Acquired	(price as of 2026-08-20)
May 24, 2017	COST	A	140	$173.01	$24,221	4,589 Direct	+3.15%	Acquired	441.9% (price as of 2026-08-20)
Oct. 25, 2016	COST	J	2,385	—	—	60,702 Indirect	+4.09%	Acquired	(price as of 2026-08-20)
Oct. 25, 2016	COST	J	2,385	—	—	4,449 Direct	-34.90%	Disposed	(price as of 2026-08-20)
Oct. 25, 2016	COST	S	2,385	$151.00	$360,135	58,317 Indirect	-3.93%	Disposed	520.9% (price as of 2026-08-20)
Oct. 22, 2016	COST	A	2,182	—	—	6,834 Direct	+46.90%	Acquired	(price as of 2026-08-20)
Oct. 26, 2015	COST	S	2,790	$154.00	$429,660	36,488 Indirect	-7.10%	Disposed	508.8% (price as of 2026-08-20)
Oct. 23, 2015	COST	S	5,000	$155.50	$777,500	58,317 Indirect	-7.90%	Disposed	502.9% (price as of 2026-08-20)
Oct. 22, 2015	COST	A	2,150	—	—	7,442 Direct	+40.63%	Acquired	(price as of 2026-08-20)
Feb. 27, 2015	COST	A	216	$146.96	$31,743	5,292 Direct	+4.26%	Acquired	537.9% (price as of 2026-08-20)
Oct. 24, 2014	COST	S	20,889	$129.67	$2,708,677	39,278 Indirect	-34.72%	Disposed	623.0% (price as of 2026-08-20)
Oct. 24, 2014	COST	J	20,889	—	—	60,167 Indirect	+53.18%	Acquired	(price as of 2026-08-20)
Oct. 24, 2014	COST	J	20,889	—	—	5,076 Direct	-80.45%	Disposed	(price as of 2026-08-20)
Oct. 22, 2014	COST	A	2,400	—	—	25,965 Direct	+10.18%	Acquired	(price as of 2026-08-20)
Oct. 28, 2013	COST	S	11,376	$116.65	$1,327,010	39,278 Indirect	-22.46%	Disposed	703.7% (price as of 2026-08-20)
Oct. 24, 2013	COST	S	9,791	$116.67	$1,142,316	50,654 Indirect	-16.20%	Disposed	703.6% (price as of 2026-08-20)
Oct. 24, 2013	COST	J	21,167	—	—	60,445 Indirect	+53.89%	Acquired	(price as of 2026-08-20)
Oct. 24, 2013	COST	J	21,167	—	—	23,565 Direct	-47.32%	Disposed	(price as of 2026-08-20)
Oct. 22, 2013	COST	A	2,400	—	—	44,732 Direct	+5.67%	Acquired	(price as of 2026-08-20)
Dec. 20, 2012	COST	S	6,000	$99.00	$594,000	39,278 Indirect	-13.25%	Disposed	847.0% (price as of 2026-08-20)
Dec. 12, 2012	COST	A	2,999	$98.31	$294,832	42,332 Direct	+7.62%	Acquired	853.6% (price as of 2026-08-20)
Oct. 24, 2012	COST	S	19,667	$94.83	$1,865,022	45,278 Indirect	-30.28%	Disposed	888.6% (price as of 2026-08-20)
Oct. 24, 2012	COST	J	19,667	—	—	64,945 Indirect	+43.44%	Acquired	(price as of 2026-08-20)
Oct. 24, 2012	COST	J	19,667	—	—	39,333 Direct	-33.33%	Disposed	(price as of 2026-08-20)
Oct. 24, 2012	COST	S	19,667	$94.83	$1,865,022	25,611 Indirect	-43.44%	Disposed	888.6% (price as of 2026-08-20)
Oct. 22, 2012	COST	A	3,000	—	—	59,000 Direct	+5.36%	Acquired	(price as of 2026-08-20)
Oct. 22, 2012	COST	A	3,000	—	—	59,000 Direct	+5.36%	Acquired	(price as of 2026-08-20)
April 13, 2012	COST	A	50,000	—	—	56,000 Direct	+833.33%	Acquired	(price as of 2026-08-20)
Oct. 22, 2011	COST	A	3,000	—	—	12,000 Direct	+33.33%	Acquired	(price as of 2026-08-20)
April 11, 2011	COST	S	7,525	$76.16	$573,104	39,278 Indirect	-16.08%	Disposed	1131.0% (price as of 2026-08-20)
April 11, 2011	COST	S	7,715	—	—	63,317 Indirect	-10.86%	Disposed	(price as of 2026-08-20)
Oct. 22, 2010	COST	A	3,000	—	—	9,000 Direct	+50.00%	Acquired	(price as of 2026-08-20)
Oct. 8, 2010	COST	M	12,000	$37.35	$448,200	0 Direct	-100.00%	Disposed	2410.1% (price as of 2026-08-20)
Oct. 8, 2010	COST	M	12,000	$30.41	$364,920	0 Direct	-100.00%	Disposed	2982.9% (price as of 2026-08-20)
Oct. 8, 2010	COST	M	12,000	$39.65	$475,800	0 Direct	-100.00%	Disposed	2264.5% (price as of 2026-08-20)
Oct. 8, 2010	COST	M	12,000	$36.19	$434,280	0 Direct	-100.00%	Disposed	2490.5% (price as of 2026-08-20)
Oct. 8, 2010	COST	S	48,000	—	—	6,000 Direct	-88.89%	Disposed	(price as of 2026-08-20)
Oct. 8, 2010	COST	M	12,000	$37.35	$448,200	54,000 Direct	+28.57%	Acquired	2410.1% (price as of 2026-08-20)
Oct. 8, 2010	COST	M	12,000	$30.41	$364,920	42,000 Direct	+40.00%	Acquired	2982.9% (price as of 2026-08-20)
Oct. 8, 2010	COST	M	12,000	$39.65	$475,800	30,000 Direct	+66.67%	Acquired	2264.5% (price as of 2026-08-20)
Oct. 8, 2010	COST	M	12,000	$36.19	$434,280	18,000 Direct	+200.00%	Acquired	2490.5% (price as of 2026-08-20)
Oct. 22, 2009	COST	A	3,000	—	—	12,000 Direct	+33.33%	Acquired	(price as of 2026-08-20)
Oct. 22, 2008	COST	A	3,000	—	—	9,000 Direct	+50.00%	Acquired	(price as of 2026-08-20)
Feb. 15, 2008	COST	M	12,000	$43.79	$525,480	46,025 Direct	+35.27%	Acquired	2040.9% (price as of 2026-08-20)
Feb. 15, 2008	COST	M	12,000	$52.50	$630,000	34,025 Direct	+54.48%	Acquired	1685.8% (price as of 2026-08-20)
Feb. 15, 2008	COST	M	16,000	$44.97	$719,520	22,025 Direct	+265.56%	Acquired	1984.8% (price as of 2026-08-20)
Feb. 15, 2008	COST	M	12,000	$43.79	$525,480	0 Direct	-100.00%	Disposed	2040.9% (price as of 2026-08-20)
Feb. 15, 2008	COST	M	12,000	$52.50	$630,000	0 Direct	-100.00%	Disposed	1685.8% (price as of 2026-08-20)
Feb. 15, 2008	COST	M	16,000	$44.97	$719,520	0 Direct	-100.00%	Disposed	1984.8% (price as of 2026-08-20)
Feb. 15, 2008	COST	S	40,000	—	—	6,025 Direct	-86.91%	Disposed	(price as of 2026-08-20)
Feb. 15, 2008	COST	M	12,000	$43.79	$525,480	0 Direct	-100.00%	Disposed	2040.9% (price as of 2026-08-20)
Feb. 15, 2008	COST	M	12,000	$52.50	$630,000	0 Direct	-100.00%	Disposed	1685.8% (price as of 2026-08-20)
Feb. 15, 2008	COST	M	16,000	$44.97	$719,520	0 Direct	-100.00%	Disposed	1984.8% (price as of 2026-08-20)
Feb. 15, 2008	COST	J	25	—	—	71,057 Indirect	+0.04%	Acquired	(price as of 2026-08-20)
Feb. 15, 2008	COST	J	25	—	—	46,778 Direct	-0.05%	Disposed	(price as of 2026-08-20)
Feb. 15, 2008	COST	S	40,000	—	—	46,803 Direct	-46.08%	Disposed	(price as of 2026-08-20)
Feb. 15, 2008	COST	M	12,000	$43.79	$525,480	86,803 Direct	+16.04%	Acquired	2040.9% (price as of 2026-08-20)
Feb. 15, 2008	COST	M	12,000	$52.50	$630,000	74,803 Direct	+19.11%	Acquired	1685.8% (price as of 2026-08-20)
Feb. 15, 2008	COST	M	16,000	$44.97	$719,520	62,803 Direct	+34.19%	Acquired	1984.8% (price as of 2026-08-20)
Jan. 2, 2008	COST	J	25	—	—	40,803 Indirect	+0.06%	Acquired	(price as of 2026-08-20)
Jan. 2, 2008	COST	J	25	—	—	6,000 Direct	-0.41%	Disposed	(price as of 2026-08-20)
Oct. 17, 2007	COST	A	3,000	—	—	46,803 Direct	+6.85%	Acquired	(price as of 2026-08-20)
Oct. 23, 2006	COST	A	25	—	—	43,803 Direct	+0.06%	Acquired	(price as of 2026-08-20)
Oct. 19, 2006	COST	A	3,000	—	—	43,780 Direct	+7.36%	Acquired	(price as of 2026-08-20)
June 12, 2006	COST	A	1,500	—	—	40,780 Direct	+3.82%	Acquired	(price as of 2026-08-20)
March 29, 2006	COST	S	19,000	$54.54	$1,036,260	71,632 Indirect	-20.96%	Disposed	1619.0% (price as of 2026-08-20)
April 1, 2005	COST	A	12,000	—	—	12,000 Direct	—	Acquired	(price as of 2026-08-20)
April 16, 2004	COST	S	35,870	$38.03	$1,364,136	93,532 Indirect	-27.72%	Disposed	2365.2% (price as of 2026-08-20)
April 16, 2004	COST	S	2,900	$38.04	$110,316	90,632 Indirect	-3.10%	Disposed	2364.6% (price as of 2026-08-20)
April 6, 2004	COST	S	34,230	$38.03	$1,301,767	129,402 Indirect	-20.92%	Disposed	2365.2% (price as of 2026-08-20)
April 1, 2004	COST	A	12,000	—	—	12,000 Direct	—	Acquired	(price as of 2026-08-20)
April 6, 2003	COST	S	34,230	$38.03	$1,301,767	129,402 Indirect	-20.92%	Disposed	2365.2% (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
Oct. 8, 2010	COST	Stock Option	Common Stock (12,000)	$37.35	April 1, 2014	12,000	Disposed
Oct. 8, 2010	COST	Stock Option	Common Stock (12,000)	$30.41	April 1, 2013	12,000	Disposed
Oct. 8, 2010	COST	Stock Option	Common Stock (12,000)	$39.65	April 1, 2012	12,000	Disposed
Oct. 8, 2010	COST	Stock Option	Common Stock (12,000)	$36.19	April 2, 2011	12,000	Disposed
Feb. 15, 2008	COST	Stock Option	Common Stock (12,000)	$43.79	April 1, 2015	12,000	Disposed
Feb. 15, 2008	COST	Stock Option	Common Stock (12,000)	$52.50	April 3, 2010	12,000	Disposed
Feb. 15, 2008	COST	Stock Option	Common Stock (16,000)	$44.97	April 1, 2009	16,000	Disposed
Feb. 15, 2008	COST	Stock Option	Common Stock (12,000)	$43.79	April 1, 2015	12,000	Disposed
Feb. 15, 2008	COST	Stock Option	Common Stock (12,000)	$52.50	April 3, 2010	12,000	Disposed
Feb. 15, 2008	COST	Stock Option	Common Stock (16,000)	$44.97	April 1, 2009	16,000	Disposed
April 1, 2005	COST	Stock Option	Common Stock (12,000)	$43.79	April 1, 2015	12,000	Acquired
April 1, 2004	COST	Stock Option	Common Stock (12,000)	$37.35	March 31, 2014	12,000	Acquired

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