Costco · Insider Trading

Last 365 days · Open-market buys and sells by officers and directors · Same-day, same-person, same-direction trades combined · Amounts in USD millions← COST

Buy

0 · $0.00M

Sell

5 · $5.3M

Net

−$5.3M

By Insider

Name	Title	Buy	Sell	Latest Trade
Adamo Claudine	Executive Vice President	—	2,200 shares · $2.0M	2026-09-29
Frates Caton	Sr. Executive Vice President	—	1,500.638 shares · $1.4M	2026-09-29
Wilcox William Richard	Executive Vice President	—	1,100 shares · $1.1M	2026-10-13
DENMAN KENNETH D	—	—	885 shares · $0.85M	2026-06-23

All Trades

Date	Name	Title	Side	Shares	Trades	Avg Price	Value
2026-10-13	Wilcox William Richard	Executive Vice President	Sell	1,100	1	958.21	$1.1M
2026-09-29	Adamo Claudine	Executive Vice President	Sell	2,200	1	915.93	$2.0M
2026-09-29	Frates Caton	Sr. Executive Vice President	Sell	800.638	1	915.93	$0.73M
2026-06-23	DENMAN KENNETH D	Director	Sell	885	1	957.45	$0.85M
2026-04-01	Frates Caton	Executive Vice President	Sell	700	1	993.00	$0.70M

Data comes from insiders' SEC ownership filings (Form 4). Only open-market purchases (P) and sales (S) are counted; option exercises, grants, tax withholding and other non-trading changes are excluded.