Joseph P Portera

Insider

First SEC filing: Sept. 15, 2020 · Latest: Sept. 15, 2020

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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.
Compensation Executive pay disclosed in company proxy statements.

Insider at

COST selling Aug. 13, 2021

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 78 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

78 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Sept. 14, 2021	COST	F	4,150	$458.41	$1,902,402	11,987 Direct	-25.72%	Disposed	105.8% (price as of 2026-08-21)
Sept. 14, 2021	COST	A	9,926	—	—	16,137 Direct	+159.81%	Acquired	(price as of 2026-08-21)
Aug. 13, 2021	COST	S	3,287	$445.50	$1,464,358	1,789 Indirect	-64.76%	Disposed	111.7% (price as of 2026-08-21)
Oct. 9, 2020	COST	G	750	—	—	5,076 Indirect	-12.87%	Disposed	(price as of 2026-08-21)
Sept. 29, 2020	COST	S	6,000	$348.00	$2,088,000	5,826 Indirect	-50.74%	Disposed	171.0% (price as of 2026-08-21)
Sept. 16, 2020	COST	J	6,937	—	—	11,826 Indirect	+141.89%	Acquired	(price as of 2026-08-21)
Sept. 16, 2020	COST	J	6,937	—	—	6,211 Direct	-52.76%	Disposed	(price as of 2026-08-21)
Sept. 14, 2020	COST	F	4,903	$342.96	$1,681,533	13,148 Direct	-27.16%	Disposed	175.0% (price as of 2026-08-21)
Sept. 14, 2020	COST	A	11,840	—	—	18,051 Direct	+190.63%	Acquired	(price as of 2026-08-21)
Oct. 30, 2019	COST	S	14,095	$299.52	$4,221,734	5,789 Indirect	-70.89%	Disposed	214.9% (price as of 2026-08-21)
Oct. 25, 2019	COST	J	9,637	—	—	19,884 Indirect	+94.05%	Acquired	(price as of 2026-08-21)
Oct. 25, 2019	COST	J	9,637	—	—	6,211 Direct	-60.81%	Disposed	(price as of 2026-08-21)
Oct. 22, 2019	COST	F	2,031	$299.97	$609,239	15,848 Direct	-11.36%	Disposed	214.4% (price as of 2026-08-21)
Oct. 22, 2019	COST	F	2,246	$299.97	$673,733	17,879 Direct	-11.16%	Disposed	214.4% (price as of 2026-08-21)
Oct. 22, 2019	COST	F	1,821	$299.97	$546,245	20,125 Direct	-8.30%	Disposed	214.4% (price as of 2026-08-21)
Oct. 22, 2019	COST	F	1,143	$299.97	$342,866	21,946 Direct	-4.95%	Disposed	214.4% (price as of 2026-08-21)
Oct. 22, 2019	COST	F	679	$299.97	$203,680	23,089 Direct	-2.86%	Disposed	214.4% (price as of 2026-08-21)
Sept. 18, 2019	COST	F	3,550	$292.43	$1,038,126	23,768 Direct	-13.00%	Disposed	222.6% (price as of 2026-08-21)
Sept. 18, 2019	COST	A	13,510	—	—	27,318 Direct	+97.84%	Acquired	(price as of 2026-08-21)
March 11, 2019	COST	S	2,864	$228.53	$654,510	13,808 Direct	-17.18%	Disposed	312.7% (price as of 2026-08-21)
March 11, 2019	COST	S	8,901	$228.50	$2,033,878	16,672 Direct	-34.81%	Disposed	312.8% (price as of 2026-08-21)
Oct. 25, 2018	COST	J	3,768	—	—	11,447 Indirect	+49.07%	Acquired	(price as of 2026-08-21)
Oct. 25, 2018	COST	J	3,768	—	—	25,573 Direct	-12.84%	Disposed	(price as of 2026-08-21)
Oct. 22, 2018	COST	F	562	$229.06	$128,732	23,116 Direct	-2.37%	Disposed	311.8% (price as of 2026-08-21)
Oct. 22, 2018	COST	F	608	$229.06	$139,268	23,678 Direct	-2.50%	Disposed	311.8% (price as of 2026-08-21)
Oct. 22, 2018	COST	F	572	$229.06	$131,022	24,286 Direct	-2.30%	Disposed	311.8% (price as of 2026-08-21)
Oct. 22, 2018	COST	F	679	$229.06	$155,532	24,858 Direct	-2.66%	Disposed	311.8% (price as of 2026-08-21)
Oct. 22, 2018	COST	F	678	$229.06	$155,303	25,537 Direct	-2.59%	Disposed	311.8% (price as of 2026-08-21)
Oct. 5, 2018	COST	J	7,472	—	—	7,679 Indirect	+3609.66%	Acquired	(price as of 2026-08-21)
Oct. 5, 2018	COST	J	7,472	—	—	26,215 Direct	-22.18%	Disposed	(price as of 2026-08-21)
Oct. 2, 2018	COST	A	18,680	—	—	44,895 Direct	+71.26%	Acquired	(price as of 2026-08-21)
Oct. 2, 2018	COST	F	4,983	$236.35	$1,177,732	33,687 Direct	-12.89%	Disposed	299.1% (price as of 2026-08-21)
Oct. 2, 2018	COST	A	12,455	—	—	38,670 Direct	+47.51%	Acquired	(price as of 2026-08-21)
Dec. 18, 2017	COST	S	10,000	$193.09	$1,930,900	207 Indirect	-97.97%	Disposed	388.5% (price as of 2026-08-21)
Oct. 27, 2017	COST	G	1,500	—	—	10,207 Indirect	-12.81%	Disposed	(price as of 2026-08-21)
Oct. 24, 2017	COST	J	3,947	—	—	11,707 Indirect	+50.86%	Acquired	(price as of 2026-08-21)
Oct. 24, 2017	COST	J	3,947	—	—	26,841 Direct	-12.82%	Disposed	(price as of 2026-08-21)
Oct. 22, 2017	COST	F	643	$160.77	$103,375	30,788 Direct	-2.05%	Disposed	486.7% (price as of 2026-08-21)
Oct. 22, 2017	COST	F	606	$160.77	$97,427	31,431 Direct	-1.89%	Disposed	486.7% (price as of 2026-08-21)
Oct. 22, 2017	COST	F	718	$160.77	$115,433	32,037 Direct	-2.19%	Disposed	486.7% (price as of 2026-08-21)
Oct. 22, 2017	COST	F	718	$160.77	$115,433	32,755 Direct	-2.15%	Disposed	486.7% (price as of 2026-08-21)
Oct. 22, 2017	COST	F	920	$160.77	$147,908	33,473 Direct	-2.67%	Disposed	486.7% (price as of 2026-08-21)
Oct. 2, 2017	COST	A	626	$165.89	$103,847	34,393 Direct	+1.85%	Acquired	468.6% (price as of 2026-08-21)
Oct. 2, 2017	COST	F	5,543	$165.89	$919,528	33,767 Direct	-14.10%	Disposed	468.6% (price as of 2026-08-21)
Oct. 2, 2017	COST	A	19,570	—	—	39,310 Direct	+99.14%	Acquired	(price as of 2026-08-21)
May 24, 2017	COST	A	448	$173.01	$77,508	19,114 Direct	+2.40%	Acquired	445.2% (price as of 2026-08-21)
May 24, 2017	COST	A	1,074	$173.01	$185,813	19,740 Direct	+5.75%	Acquired	445.2% (price as of 2026-08-21)
Jan. 10, 2017	COST	J	356	—	—	7,760 Indirect	+4.81%	Acquired	(price as of 2026-08-21)
Jan. 10, 2017	COST	J	356	—	—	18,666 Direct	-1.87%	Disposed	(price as of 2026-08-21)
Dec. 9, 2016	COST	S	16,921	$158.38	$2,679,948	19,022 Direct	-47.08%	Disposed	495.6% (price as of 2026-08-21)
Oct. 5, 2016	COST	F	4,893	$149.98	$733,852	47,111 Direct	-9.41%	Disposed	528.9% (price as of 2026-08-21)
Oct. 5, 2016	COST	A	18,440	—	—	52,004 Direct	+54.94%	Acquired	(price as of 2026-08-21)
Oct. 22, 2015	COST	F	697	$158.15	$110,231	19,218 Direct	-3.50%	Disposed	496.4% (price as of 2026-08-21)
Oct. 22, 2015	COST	F	698	$158.15	$110,389	19,915 Direct	-3.39%	Disposed	496.4% (price as of 2026-08-21)
Oct. 22, 2015	COST	F	893	$158.15	$141,228	20,613 Direct	-4.15%	Disposed	496.4% (price as of 2026-08-21)
Oct. 22, 2015	COST	F	893	$158.15	$141,228	21,506 Direct	-3.99%	Disposed	496.4% (price as of 2026-08-21)
Oct. 22, 2015	COST	F	892	$158.15	$141,070	22,399 Direct	-3.83%	Disposed	496.4% (price as of 2026-08-21)
Oct. 13, 2015	COST	S	10,000	$152.75	$1,527,500	23,291 Direct	-30.04%	Disposed	517.5% (price as of 2026-08-21)
Sept. 24, 2015	COST	F	5,960	$144.87	$863,425	70,945 Direct	-7.75%	Disposed	551.1% (price as of 2026-08-21)
Sept. 24, 2015	COST	A	21,000	—	—	76,905 Direct	+37.56%	Acquired	(price as of 2026-08-21)
Feb. 27, 2015	COST	A	1,599	$146.96	$234,989	55,005 Direct	+2.99%	Acquired	541.8% (price as of 2026-08-21)
Oct. 29, 2014	COST	S	15,000	$131.55	$1,973,250	53,406 Direct	-21.93%	Disposed	617.0% (price as of 2026-08-21)
Oct. 24, 2014	COST	J	17,645	—	—	29,645 Indirect	+147.04%	Acquired	(price as of 2026-08-21)
Oct. 24, 2014	COST	J	17,645	—	—	68,406 Direct	-20.51%	Disposed	(price as of 2026-08-21)
Oct. 22, 2014	COST	F	1,590	$130.54	$207,559	100,327 Direct	-1.56%	Disposed	622.6% (price as of 2026-08-21)
Oct. 22, 2014	COST	F	2,567	$130.54	$335,096	97,760 Direct	-2.56%	Disposed	622.6% (price as of 2026-08-21)
Oct. 22, 2014	COST	F	3,423	$130.54	$446,838	94,337 Direct	-3.50%	Disposed	622.6% (price as of 2026-08-21)
Oct. 22, 2014	COST	F	4,279	$130.54	$558,581	90,058 Direct	-4.54%	Disposed	622.6% (price as of 2026-08-21)
Oct. 22, 2014	COST	F	4,007	$130.54	$523,074	86,051 Direct	-4.45%	Disposed	622.6% (price as of 2026-08-21)
Oct. 9, 2014	COST	S	4,685	$130.13	$609,659	101,917 Direct	-4.39%	Disposed	624.9% (price as of 2026-08-21)
Sept. 26, 2014	COST	F	2,319	$125.54	$291,127	106,602 Direct	-2.13%	Disposed	651.4% (price as of 2026-08-21)
Sept. 26, 2014	COST	A	21,000	—	—	108,921 Direct	+23.89%	Acquired	(price as of 2026-08-21)
Oct. 29, 2013	COST	S	14,900	$118.29	$1,762,521	12,000 Indirect	-55.39%	Disposed	697.4% (price as of 2026-08-21)
Oct. 22, 2013	COST	F	1,711	$117.81	$201,573	112,914 Direct	-1.49%	Disposed	700.7% (price as of 2026-08-21)
Oct. 22, 2013	COST	F	1,712	$117.81	$201,691	114,625 Direct	-1.47%	Disposed	700.7% (price as of 2026-08-21)
Oct. 22, 2013	COST	F	1,711	$117.81	$201,573	116,337 Direct	-1.45%	Disposed	700.7% (price as of 2026-08-21)
Oct. 22, 2013	COST	F	1,711	$117.81	$201,573	118,048 Direct	-1.43%	Disposed	700.7% (price as of 2026-08-21)
Oct. 22, 2013	COST	F	1,711	$117.81	$201,573	119,759 Direct	-1.41%	Disposed	700.7% (price as of 2026-08-21)
Sept. 20, 2013	COST	F	3,059	$117.94	$360,778	121,470 Direct	-2.46%	Disposed	699.8% (price as of 2026-08-21)
Sept. 20, 2013	COST	A	25,000	—	—	124,529 Direct	+25.12%	Acquired	(price as of 2026-08-21)
Dec. 31, 2012	COST	S	16,000	$97.34	$1,557,440	99,529 Direct	-13.85%	Disposed	869.0% (price as of 2026-08-21)
Dec. 12, 2012	COST	A	2,541	$98.31	$249,806	115,529 Direct	+2.25%	Acquired	859.5% (price as of 2026-08-21)
Oct. 22, 2012	COST	F	1,407	$95.00	$133,665	112,988 Direct	-1.23%	Disposed	892.9% (price as of 2026-08-21)
Oct. 22, 2012	COST	F	1,407	$95.00	$133,665	114,395 Direct	-1.22%	Disposed	892.9% (price as of 2026-08-21)
Oct. 22, 2012	COST	F	1,407	$95.00	$133,665	115,802 Direct	-1.20%	Disposed	892.9% (price as of 2026-08-21)
Oct. 22, 2012	COST	F	1,407	$95.00	$133,665	117,209 Direct	-1.19%	Disposed	892.9% (price as of 2026-08-21)
Oct. 17, 2012	COST	F	1,943	$96.78	$188,044	118,616 Direct	-1.61%	Disposed	874.6% (price as of 2026-08-21)
Sept. 26, 2012	COST	F	2,685	$101.00	$271,185	120,559 Direct	-2.18%	Disposed	833.9% (price as of 2026-08-21)
Sept. 26, 2012	COST	A	25,000	—	—	123,244 Direct	+25.45%	Acquired	(price as of 2026-08-21)
Oct. 27, 2011	COST	S	11,745	$84.45	$991,865	46,991 Direct	-20.00%	Disposed	1016.9% (price as of 2026-08-21)
Oct. 22, 2011	COST	F	1,407	$85.30	$120,017	98,244 Direct	-1.41%	Disposed	1005.8% (price as of 2026-08-21)
Oct. 14, 2011	COST	S	2,309	$82.37	$190,192	66,987 Direct	-3.33%	Disposed	1045.1% (price as of 2026-08-21)
Oct. 12, 2011	COST	S	5,199	$81.95	$426,058	69,296 Direct	-6.98%	Disposed	1051.0% (price as of 2026-08-21)
Nov. 11, 2010	COST	S	15,000	$64.46	$966,900	52,959 Direct	-22.07%	Disposed	1363.3% (price as of 2026-08-21)
Nov. 10, 2010	COST	S	3,000	$64.34	$193,020	67,959 Direct	-4.23%	Disposed	1366.0% (price as of 2026-08-21)
May 6, 2010	COST	S	2,000	$55.17	$110,340	55,289 Direct	-3.49%	Disposed	1609.7% (price as of 2026-08-21)
Nov. 9, 2009	COST	S	2,000	$60.00	$120,000	58,058 Direct	-3.33%	Disposed	1472.1% (price as of 2026-08-21)
Nov. 4, 2009	COST	S	6,000	$58.59	$351,540	60,058 Direct	-9.08%	Disposed	1509.9% (price as of 2026-08-21)
Nov. 3, 2009	COST	S	2,000	$58.00	$116,000	66,058 Direct	-2.94%	Disposed	1526.3% (price as of 2026-08-21)
Oct. 30, 2009	COST	S	2,000	$57.00	$114,000	68,058 Direct	-2.85%	Disposed	1554.8% (price as of 2026-08-21)

Showing latest 100 of 191 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
April 30, 2010	COST	Stock Option	Common Stock (15,000)	$43.79	April 1, 2015	15,000	Disposed
Oct. 9, 2009	COST	Stock Option	Common Stock (15,000)	$43.79	April 1, 2015	15,000	Disposed
July 27, 2009	COST	Stock Option	Common Stock (15,000)	$37.35	April 1, 2014	15,000	Disposed
April 1, 2008	COST	Stock Option	Common Stock (15,000)	$33.75	April 1, 2013	15,000	Disposed
April 1, 2008	COST	Stock Option	Common Stock (15,000)	$43.79	April 1, 2015	15,000	Disposed
April 1, 2008	COST	Stock Option	Common Stock (15,000)	$37.35	April 1, 2014	15,000	Disposed
April 3, 2007	COST	Stock Option	Common Stock (15,000)	$33.75	April 1, 2013	15,000	Disposed
April 3, 2007	COST	Stock Option	Common Stock (15,000)	$39.25	April 2, 2012	15,000	Disposed
April 3, 2007	COST	Stock Option	Common Stock (15,000)	$43.79	April 1, 2015	15,000	Disposed
April 3, 2007	COST	Stock Option	Common Stock (15,000)	$37.35	April 1, 2014	15,000	Disposed
April 24, 2006	COST	Stock Option	Common Stock (15,000)	$34.28	April 24, 2011	15,000	Disposed
April 10, 2006	COST	Stock Option	Common Stock (15,000)	$43.79	April 1, 2015	15,000	Disposed
April 10, 2006	COST	Stock Option	Common Stock (15,000)	$37.35	April 1, 2014	15,000	Disposed
April 10, 2006	COST	Stock Option	Common Stock (15,000)	$30.41	April 1, 2013	15,000	Disposed
April 10, 2006	COST	Stock Option	Common Stock (15,000)	$38.79	April 2, 2012	15,000	Disposed
June 6, 2005	COST	Stock Option	Common Stock (75,000)	$43.00	March 13, 2010	75,000	Disposed
June 6, 2005	COST	Stock Option	Common Stock (15,000)	$38.79	April 1, 2012	15,000	Disposed
June 6, 2005	COST	Stock Option	Common Stock (15,000)	$37.35	March 31, 2014	15,000	Disposed
June 6, 2005	COST	Stock Option	Common Stock (15,000)	$34.28	April 24, 2011	15,000	Disposed
June 6, 2005	COST	Stock Option	Common Stock (15,000)	$30.41	April 1, 2013	15,000	Disposed
April 1, 2005	COST	Stock Option	Common Stock (75,000)	$43.79	April 1, 2015	75,000	Acquired
June 24, 2004	COST	Stock Option	Common Stock (30,000)	$38.79	April 1, 2012	30,000	Disposed
June 7, 2004	COST	Stock Option	Common Stock (40,000)	$36.91	Feb. 9, 2009	40,000	Disposed
June 7, 2004	COST	Stock Option	Common Stock (30,000)	$34.28	April 24, 2011	30,000	Disposed
June 7, 2004	COST	Stock Option	Common Stock (15,000)	$30.41	April 1, 2013	15,000	Disposed
April 1, 2004	COST	Stock Option	Common Stock (75,000)	$37.35	March 31, 2014	75,000	Acquired
April 1, 2004	COST	Stock Option	Common Stock (75,000)	$0.00	March 31, 2014	75,000	Acquired

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

Compensation (DEF 14A)

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

COST

Fiscal year	Salary	Bonus	Stock awards	Option awards	Non-equity incentive	Pension change	Other	Total
2021	$785,000	$8,000	—	—	$81,608	$50,352	$105,260	$4,689,043
2020	$765,000	$94,000	—	—	—	$65,605	$100,473	$4,620,412
2019	$737,046	$75,957	—	—	—	$63,418	$96,150	$4,147,856

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