Roland Michael Vachris

Insider

First SEC filing: July 14, 2016 · Latest: July 14, 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.
Initial holdings The stakes this person held when they first started reporting.

Insider at

COST selling March 11, 2025

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 38 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

38 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Oct. 22, 2025	COST	F	1,160	$944.68	$1,095,829	52,258 Direct	-2.17%	Disposed	-0.2% (price as of 2026-08-21)
Oct. 22, 2025	COST	F	1,493	$944.68	$1,410,407	53,418 Direct	-2.72%	Disposed	-0.2% (price as of 2026-08-21)
Oct. 22, 2025	COST	A	13,834	—	—	54,911 Direct	+33.68%	Acquired	(price as of 2026-08-21)
March 11, 2025	COST	S	3,600	$931.00	$3,351,600	41,077 Direct	-8.06%	Disposed	1.3% (price as of 2026-08-21)
Oct. 22, 2024	COST	F	1,731	$893.49	$1,546,631	44,677 Direct	-3.73%	Disposed	5.6% (price as of 2026-08-21)
Oct. 22, 2024	COST	A	19,148	—	—	46,408 Direct	+70.24%	Acquired	(price as of 2026-08-21)
Sept. 15, 2023	COST	F	5,491	$556.36	$3,054,973	27,260 Direct	-16.77%	Disposed	69.5% (price as of 2026-08-21)
Sept. 15, 2023	COST	A	14,639	—	—	32,751 Direct	+80.82%	Acquired	(price as of 2026-08-21)
March 6, 2023	COST	S	4,100	$476.29	$1,952,789	18,112 Direct	-18.46%	Disposed	98.0% (price as of 2026-08-21)
Sept. 12, 2022	COST	F	4,461	$539.52	$2,406,799	22,212 Direct	-16.72%	Disposed	74.8% (price as of 2026-08-21)
Sept. 12, 2022	COST	A	12,042	—	—	26,673 Direct	+82.30%	Acquired	(price as of 2026-08-21)
Jan. 27, 2022	COST	S	3,318	$492.45	$1,633,949	14,631 Direct	-18.49%	Disposed	91.5% (price as of 2026-08-21)
Sept. 14, 2021	COST	F	3,579	$458.41	$1,640,649	17,949 Direct	-16.62%	Disposed	105.8% (price as of 2026-08-21)
Sept. 14, 2021	COST	A	9,926	—	—	21,528 Direct	+85.55%	Acquired	(price as of 2026-08-21)
July 12, 2021	COST	S	4,000	$409.40	$1,637,600	11,602 Direct	-25.64%	Disposed	130.4% (price as of 2026-08-21)
March 22, 2021	COST	S	4,300	$334.30	$1,437,490	15,602 Direct	-21.61%	Disposed	182.2% (price as of 2026-08-21)
Sept. 14, 2020	COST	F	4,222	$342.92	$1,447,808	19,902 Direct	-17.50%	Disposed	175.1% (price as of 2026-08-21)
Sept. 14, 2020	COST	A	11,840	—	—	24,124 Direct	+96.39%	Acquired	(price as of 2026-08-21)
June 19, 2020	COST	S	4,000	$300.95	$1,203,800	12,284 Direct	-24.56%	Disposed	213.4% (price as of 2026-08-21)
Dec. 17, 2019	COST	S	6,000	$295.22	$1,771,320	16,284 Direct	-26.93%	Disposed	219.5% (price as of 2026-08-21)
Sept. 18, 2019	COST	F	4,804	$292.43	$1,404,834	22,284 Direct	-17.73%	Disposed	222.6% (price as of 2026-08-21)
Sept. 18, 2019	COST	A	13,510	—	—	27,088 Direct	+99.50%	Acquired	(price as of 2026-08-21)
June 24, 2019	COST	S	3,700	$267.25	$988,825	13,578 Direct	-21.41%	Disposed	252.9% (price as of 2026-08-21)
Oct. 22, 2018	COST	F	2,450	$229.06	$561,197	11,052 Direct	-18.15%	Disposed	311.8% (price as of 2026-08-21)
Oct. 22, 2018	COST	F	2,119	$229.06	$485,378	13,502 Direct	-13.57%	Disposed	311.8% (price as of 2026-08-21)
Oct. 22, 2018	COST	F	762	$229.06	$174,544	15,621 Direct	-4.65%	Disposed	311.8% (price as of 2026-08-21)
Oct. 22, 2018	COST	F	599	$229.06	$137,207	16,383 Direct	-3.53%	Disposed	311.8% (price as of 2026-08-21)
Oct. 22, 2018	COST	F	300	$229.06	$68,718	16,982 Direct	-1.74%	Disposed	311.8% (price as of 2026-08-21)
Oct. 15, 2018	COST	S	6,600	$225.88	$1,490,808	17,282 Direct	-27.64%	Disposed	317.6% (price as of 2026-08-21)
Oct. 2, 2018	COST	A	18,680	—	—	34,374 Direct	+119.03%	Acquired	(price as of 2026-08-21)
Oct. 2, 2018	COST	F	4,266	$236.35	$1,008,269	23,882 Direct	-15.16%	Disposed	299.1% (price as of 2026-08-21)
Oct. 2, 2018	COST	A	12,454	—	—	28,148 Direct	+79.36%	Acquired	(price as of 2026-08-21)
Jan. 8, 2018	COST	S	5,200	$187.98	$977,496	15,694 Direct	-24.89%	Disposed	401.8% (price as of 2026-08-21)
Oct. 22, 2017	COST	F	566	$160.77	$90,996	21,520 Direct	-2.56%	Disposed	486.7% (price as of 2026-08-21)
Oct. 22, 2017	COST	F	272	$160.77	$43,729	22,086 Direct	-1.22%	Disposed	486.7% (price as of 2026-08-21)
Oct. 22, 2017	COST	F	320	$160.77	$51,446	22,358 Direct	-1.41%	Disposed	486.7% (price as of 2026-08-21)
Oct. 22, 2017	COST	F	320	$160.77	$51,446	22,678 Direct	-1.39%	Disposed	486.7% (price as of 2026-08-21)
Oct. 22, 2017	COST	F	404	$160.77	$64,951	22,998 Direct	-1.73%	Disposed	486.7% (price as of 2026-08-21)
Oct. 2, 2017	COST	A	626	$165.89	$103,847	23,402 Direct	+2.75%	Acquired	468.6% (price as of 2026-08-21)
Oct. 2, 2017	COST	F	4,769	$165.89	$791,129	22,776 Direct	-17.31%	Disposed	468.6% (price as of 2026-08-21)
Oct. 2, 2017	COST	A	19,570	—	—	27,545 Direct	+245.39%	Acquired	(price as of 2026-08-21)
May 24, 2017	COST	A	226	$173.01	$39,100	7,349 Direct	+3.17%	Acquired	445.2% (price as of 2026-08-21)
May 24, 2017	COST	A	852	$173.01	$147,405	7,975 Direct	+11.96%	Acquired	445.2% (price as of 2026-08-21)
Jan. 11, 2017	COST	S	3,180	$161.73	$514,301	7,123 Direct	-30.86%	Disposed	483.2% (price as of 2026-08-21)
Oct. 22, 2016	COST	F	172	$148.97	$25,623	10,303 Direct	-1.64%	Disposed	533.2% (price as of 2026-08-21)
Oct. 22, 2016	COST	F	202	$148.97	$30,092	10,475 Direct	-1.89%	Disposed	533.2% (price as of 2026-08-21)
Oct. 22, 2016	COST	F	202	$148.97	$30,092	10,677 Direct	-1.86%	Disposed	533.2% (price as of 2026-08-21)
Oct. 22, 2016	COST	F	256	$148.97	$38,136	10,879 Direct	-2.30%	Disposed	533.2% (price as of 2026-08-21)
Oct. 22, 2016	COST	F	256	$148.97	$38,136	11,135 Direct	-2.25%	Disposed	533.2% (price as of 2026-08-21)

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.

Initial ownership (Form 3) 1 holding

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

Date	Ticker	Security	Shares	Ownership
July 14, 2016	COST	Common Stock	—	Direct