John D Mckay

Insider

First SEC filing: Jan. 7, 2016 · Latest: Jan. 7, 2016

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.
Initial holdings The stakes this person held when they first started reporting.

Insider at

COST selling Nov. 13, 2017

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 79 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

79 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Oct. 22, 2018	COST	F	2,450	$229.06	$561,197	37,426 Direct	-6.14%	Disposed	309.3% (price as of 2026-08-20)
Oct. 22, 2018	COST	F	2,119	$229.06	$485,378	39,876 Direct	-5.05%	Disposed	309.3% (price as of 2026-08-20)
Oct. 22, 2018	COST	F	1,497	$229.06	$342,903	41,995 Direct	-3.44%	Disposed	309.3% (price as of 2026-08-20)
Oct. 22, 2018	COST	F	1,185	$229.06	$271,436	43,492 Direct	-2.65%	Disposed	309.3% (price as of 2026-08-20)
Oct. 22, 2018	COST	F	592	$229.06	$135,604	44,677 Direct	-1.31%	Disposed	309.3% (price as of 2026-08-20)
Oct. 2, 2018	COST	A	18,680	—	—	55,761 Direct	+50.38%	Acquired	(price as of 2026-08-20)
Oct. 2, 2018	COST	F	4,266	$236.35	$1,008,269	45,269 Direct	-8.61%	Disposed	296.7% (price as of 2026-08-20)
Oct. 2, 2018	COST	A	12,454	—	—	49,535 Direct	+33.59%	Acquired	(price as of 2026-08-20)
Nov. 13, 2017	COST	S	8,111	$172.78	$1,401,419	66,751 Direct	-10.83%	Disposed	442.6% (price as of 2026-08-20)
Oct. 22, 2017	COST	F	566	$160.77	$90,996	74,862 Direct	-0.75%	Disposed	483.1% (price as of 2026-08-20)
Oct. 22, 2017	COST	F	533	$160.77	$85,690	75,428 Direct	-0.70%	Disposed	483.1% (price as of 2026-08-20)
Oct. 22, 2017	COST	F	633	$160.77	$101,767	75,961 Direct	-0.83%	Disposed	483.1% (price as of 2026-08-20)
Oct. 22, 2017	COST	F	631	$160.77	$101,446	76,594 Direct	-0.82%	Disposed	483.1% (price as of 2026-08-20)
Oct. 22, 2017	COST	F	809	$160.77	$130,063	77,225 Direct	-1.04%	Disposed	483.1% (price as of 2026-08-20)
Oct. 2, 2017	COST	A	626	$165.89	$103,847	78,034 Direct	+0.81%	Acquired	465.1% (price as of 2026-08-20)
Oct. 2, 2017	COST	F	4,769	$165.89	$791,129	77,408 Direct	-5.80%	Disposed	465.1% (price as of 2026-08-20)
Oct. 2, 2017	COST	A	19,570	—	—	82,177 Direct	+31.26%	Acquired	(price as of 2026-08-20)
June 5, 2017	COST	S	3,000	$181.60	$544,800	62,607 Direct	-4.57%	Disposed	416.3% (price as of 2026-08-20)
May 24, 2017	COST	A	449	$173.01	$77,681	64,981 Direct	+0.70%	Acquired	441.9% (price as of 2026-08-20)
May 24, 2017	COST	A	1,075	$173.01	$185,986	65,607 Direct	+1.67%	Acquired	441.9% (price as of 2026-08-20)
Feb. 3, 2017	COST	S	4,948	$168.25	$832,501	64,532 Direct	-7.12%	Disposed	457.2% (price as of 2026-08-20)
Oct. 22, 2016	COST	F	516	$148.97	$76,869	69,480 Direct	-0.74%	Disposed	529.3% (price as of 2026-08-20)
Oct. 22, 2016	COST	F	613	$148.97	$91,319	69,996 Direct	-0.87%	Disposed	529.3% (price as of 2026-08-20)
Oct. 22, 2016	COST	F	613	$148.97	$91,319	70,609 Direct	-0.86%	Disposed	529.3% (price as of 2026-08-20)
Oct. 22, 2016	COST	F	784	$148.97	$116,792	71,222 Direct	-1.09%	Disposed	529.3% (price as of 2026-08-20)
Oct. 22, 2016	COST	F	784	$148.97	$116,792	72,006 Direct	-1.08%	Disposed	529.3% (price as of 2026-08-20)
Oct. 5, 2016	COST	F	4,185	$149.98	$627,666	72,790 Direct	-5.44%	Disposed	525.1% (price as of 2026-08-20)
Oct. 5, 2016	COST	A	18,440	—	—	76,975 Direct	+31.50%	Acquired	(price as of 2026-08-20)
July 11, 2016	COST	S	7,500	$166.58	$1,249,350	58,535 Direct	-11.36%	Disposed	462.8% (price as of 2026-08-20)
March 31, 2016	COST	S	4,455	$159.00	$708,345	66,035 Direct	-6.32%	Disposed	489.6% (price as of 2026-08-20)
Oct. 22, 2015	COST	F	613	$158.15	$96,946	70,465 Direct	-0.86%	Disposed	492.8% (price as of 2026-08-20)
Oct. 22, 2015	COST	F	614	$158.15	$97,104	71,078 Direct	-0.86%	Disposed	492.8% (price as of 2026-08-20)
Oct. 22, 2015	COST	F	786	$158.15	$124,306	71,692 Direct	-1.08%	Disposed	492.8% (price as of 2026-08-20)
Oct. 22, 2015	COST	F	784	$158.15	$123,990	72,478 Direct	-1.07%	Disposed	492.8% (price as of 2026-08-20)
Oct. 22, 2015	COST	F	784	$158.15	$123,990	73,262 Direct	-1.06%	Disposed	492.8% (price as of 2026-08-20)
Oct. 12, 2015	COST	S	6,779	$154.00	$1,043,966	74,046 Direct	-8.39%	Disposed	508.8% (price as of 2026-08-20)
Sept. 24, 2015	COST	F	5,119	$144.87	$741,590	81,725 Direct	-5.89%	Disposed	547.1% (price as of 2026-08-20)
Sept. 24, 2015	COST	A	21,000	—	—	86,844 Direct	+31.89%	Acquired	(price as of 2026-08-20)
Feb. 27, 2015	COST	A	1,599	$146.96	$234,989	64,944 Direct	+2.52%	Acquired	537.9% (price as of 2026-08-20)
Dec. 18, 2014	COST	S	3,648	$141.07	$514,623	63,345 Direct	-5.45%	Disposed	564.6% (price as of 2026-08-20)
Oct. 22, 2014	COST	F	376	$130.54	$49,083	69,840 Direct	-0.54%	Disposed	618.2% (price as of 2026-08-20)
Oct. 22, 2014	COST	F	753	$130.54	$98,297	69,087 Direct	-1.08%	Disposed	618.2% (price as of 2026-08-20)
Oct. 22, 2014	COST	F	753	$130.54	$98,297	68,334 Direct	-1.09%	Disposed	618.2% (price as of 2026-08-20)
Oct. 22, 2014	COST	F	753	$130.54	$98,297	67,581 Direct	-1.10%	Disposed	618.2% (price as of 2026-08-20)
Oct. 22, 2014	COST	F	588	$130.54	$76,758	66,993 Direct	-0.87%	Disposed	618.2% (price as of 2026-08-20)
Sept. 26, 2014	COST	F	4,725	$125.54	$593,176	70,216 Direct	-6.30%	Disposed	646.8% (price as of 2026-08-20)
Sept. 26, 2014	COST	A	21,000	—	—	74,941 Direct	+38.93%	Acquired	(price as of 2026-08-20)
Aug. 11, 2014	COST	S	12,000	$118.94	$1,427,280	53,941 Direct	-18.20%	Disposed	688.2% (price as of 2026-08-20)
March 14, 2014	COST	S	3,000	$114.00	$342,000	65,941 Direct	-4.35%	Disposed	722.4% (price as of 2026-08-20)
Jan. 2, 2014	COST	S	4,655	$118.40	$551,152	68,941 Direct	-6.33%	Disposed	691.8% (price as of 2026-08-20)
Nov. 1, 2013	COST	S	4,000	$118.93	$475,720	73,596 Direct	-5.15%	Disposed	688.3% (price as of 2026-08-20)
Oct. 22, 2013	COST	F	4,515	$117.81	$531,912	75,689 Direct	-5.63%	Disposed	695.8% (price as of 2026-08-20)
Oct. 22, 2013	COST	F	3,765	$117.81	$443,555	80,204 Direct	-4.48%	Disposed	695.8% (price as of 2026-08-20)
Oct. 22, 2013	COST	F	3,011	$117.81	$354,726	83,969 Direct	-3.46%	Disposed	695.8% (price as of 2026-08-20)
Oct. 22, 2013	COST	F	1,129	$117.81	$133,007	86,980 Direct	-1.28%	Disposed	695.8% (price as of 2026-08-20)
Oct. 22, 2013	COST	F	753	$117.81	$88,711	88,109 Direct	-0.85%	Disposed	695.8% (price as of 2026-08-20)
Sept. 20, 2013	COST	A	1,907	$117.94	$224,912	90,769 Direct	+2.15%	Acquired	694.9% (price as of 2026-08-20)
Sept. 20, 2013	COST	F	2,547	$117.94	$300,393	88,862 Direct	-2.79%	Disposed	694.9% (price as of 2026-08-20)
Sept. 20, 2013	COST	A	25,000	—	—	91,409 Direct	+37.65%	Acquired	(price as of 2026-08-20)
May 2, 2013	COST	S	3,000	$109.11	$327,330	66,409 Direct	-4.32%	Disposed	759.2% (price as of 2026-08-20)
Dec. 21, 2012	COST	S	2,000	$99.00	$198,000	69,409 Direct	-2.80%	Disposed	847.0% (price as of 2026-08-20)
Dec. 12, 2012	COST	A	2,160	$98.31	$212,350	71,409 Direct	+3.12%	Acquired	853.6% (price as of 2026-08-20)
Oct. 22, 2012	COST	F	1,215	$95.00	$115,425	69,249 Direct	-1.72%	Disposed	886.9% (price as of 2026-08-20)
Oct. 22, 2012	COST	F	1,215	$95.00	$115,425	70,464 Direct	-1.70%	Disposed	886.9% (price as of 2026-08-20)
Oct. 22, 2012	COST	F	608	$95.00	$57,760	71,679 Direct	-0.84%	Disposed	886.9% (price as of 2026-08-20)
Oct. 22, 2012	COST	F	608	$95.00	$57,760	72,287 Direct	-0.83%	Disposed	886.9% (price as of 2026-08-20)
Oct. 17, 2012	COST	F	751	$96.78	$72,682	72,895 Direct	-1.02%	Disposed	868.7% (price as of 2026-08-20)
Sept. 26, 2012	COST	F	2,205	$101.00	$222,705	73,646 Direct	-2.91%	Disposed	828.2% (price as of 2026-08-20)
Sept. 26, 2012	COST	A	25,000	—	—	75,851 Direct	+49.16%	Acquired	(price as of 2026-08-20)
July 27, 2012	COST	S	2,500	$96.79	$241,975	50,851 Direct	-4.69%	Disposed	868.6% (price as of 2026-08-20)
March 8, 2012	COST	S	4,000	$88.00	$352,000	53,351 Direct	-6.97%	Disposed	965.4% (price as of 2026-08-20)
Oct. 22, 2011	COST	F	1,215	$85.30	$103,640	57,351 Direct	-2.07%	Disposed	999.1% (price as of 2026-08-20)
Oct. 22, 2011	COST	F	608	$85.30	$51,862	58,566 Direct	-1.03%	Disposed	999.1% (price as of 2026-08-20)
Oct. 22, 2011	COST	F	608	$85.30	$51,862	59,174 Direct	-1.02%	Disposed	999.1% (price as of 2026-08-20)
Oct. 21, 2011	COST	M	26,800	$43.79	$1,173,572	0 Direct	-100.00%	Disposed	2040.9% (price as of 2026-08-20)
Oct. 21, 2011	COST	S	26,800	$84.91	$2,275,588	59,782 Direct	-30.95%	Disposed	1004.1% (price as of 2026-08-20)
Oct. 21, 2011	COST	M	26,800	$43.79	$1,173,572	86,582 Direct	+44.83%	Acquired	2040.9% (price as of 2026-08-20)
Oct. 20, 2011	COST	M	10,700	$43.79	$468,553	26,800 Direct	-28.53%	Disposed	2040.9% (price as of 2026-08-20)
Oct. 20, 2011	COST	S	10,700	—	—	49,082 Direct	-17.90%	Disposed	(price as of 2026-08-20)
Oct. 20, 2011	COST	M	10,700	$43.79	$468,553	59,782 Direct	+21.80%	Acquired	2040.9% (price as of 2026-08-20)
Oct. 20, 2011	COST	S	10,700	—	—	49,082 Direct	-17.90%	Disposed	(price as of 2026-08-20)
Oct. 19, 2011	COST	F	905	$84.38	$76,364	59,782 Direct	-1.49%	Disposed	1011.1% (price as of 2026-08-20)
Oct. 19, 2011	COST	F	905	$84.38	$76,364	59,782 Direct	-1.49%	Disposed	1011.1% (price as of 2026-08-20)
Oct. 17, 2011	COST	F	899	$82.36	$74,042	60,687 Direct	-1.46%	Disposed	1038.3% (price as of 2026-08-20)
Sept. 28, 2011	COST	F	2,852	$83.79	$238,969	36,586 Direct	-7.23%	Disposed	1018.9% (price as of 2026-08-20)
Sept. 28, 2011	COST	A	25,000	—	—	61,586 Direct	+68.33%	Acquired	(price as of 2026-08-20)
Sept. 28, 2011	COST	F	2,852	$83.79	$238,969	36,586 Direct	-7.23%	Disposed	1018.9% (price as of 2026-08-20)
April 26, 2011	COST	M	17,500	$37.35	$653,625	0 Direct	-100.00%	Disposed	2410.1% (price as of 2026-08-20)
April 26, 2011	COST	S	17,500	—	—	39,438 Direct	-30.74%	Disposed	(price as of 2026-08-20)
April 26, 2011	COST	M	17,500	$37.35	$653,625	56,938 Direct	+44.37%	Acquired	2410.1% (price as of 2026-08-20)
April 12, 2011	COST	S	25	$76.19	$1,905	39,438 Direct	-0.06%	Disposed	1130.5% (price as of 2026-08-20)
April 12, 2011	COST	F	317	$76.45	$24,235	39,463 Direct	-0.80%	Disposed	1126.3% (price as of 2026-08-20)
April 12, 2011	COST	F	317	$76.45	$24,235	39,463 Direct	-0.80%	Disposed	1126.3% (price as of 2026-08-20)
Oct. 22, 2010	COST	F	608	$64.03	$38,930	39,780 Direct	-1.51%	Disposed	1364.2% (price as of 2026-08-20)
Oct. 22, 2010	COST	F	608	$64.03	$38,930	40,388 Direct	-1.48%	Disposed	1364.2% (price as of 2026-08-20)
Oct. 19, 2010	COST	F	912	$62.21	$56,736	40,996 Direct	-2.18%	Disposed	1407.0% (price as of 2026-08-20)
Oct. 17, 2010	COST	F	912	$63.70	$58,094	41,908 Direct	-2.13%	Disposed	1371.8% (price as of 2026-08-20)
Oct. 8, 2010	COST	M	15,000	$38.79	$581,850	0 Direct	-100.00%	Disposed	2316.9% (price as of 2026-08-20)
Oct. 8, 2010	COST	M	22,500	$39.25	$883,125	0 Direct	-100.00%	Disposed	2288.6% (price as of 2026-08-20)
Oct. 8, 2010	COST	S	37,500	—	—	42,820 Direct	-46.69%	Disposed	(price as of 2026-08-20)

Showing latest 100 of 103 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
Oct. 21, 2011	COST	Stock Option	Common Stock (26,800)	$43.79	April 1, 2015	26,800	Disposed
Oct. 20, 2011	COST	Stock Option	Common Stock (10,700)	$43.79	April 1, 2015	10,700	Disposed
April 26, 2011	COST	Stock Option	Common Stock (17,500)	$37.35	April 1, 2014	17,500	Disposed
Oct. 8, 2010	COST	Stock Option	Common Stock (15,000)	$38.79	April 2, 2012	15,000	Disposed
Oct. 8, 2010	COST	Stock Option	Common Stock (22,500)	$39.25	April 2, 2012	22,500	Disposed

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

Initial ownership (Form 3) 6 holdings

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

Date	Ticker	Security	Shares	Ownership
Jan. 7, 2016	COST	Common Stock	43,176	Direct
March 15, 2010	COST	Common Stock	43,151	Direct
March 15, 2010	COST	Stock Option→ Common Stock (22,500)	22,500	Direct
March 15, 2010	COST	Stock Option→ Common Stock (15,000)	15,000	Direct
March 15, 2010	COST	Stock Option→ Common Stock (37,500)	37,500	Direct
March 15, 2010	COST	Stock Option→ Common Stock (37,500)	37,500	Direct