Costco Wholesale Corp /new (COST) insider trading
Every open-market stock purchase and sale by Costco Wholesale Corp /new executives, directors, large shareholders and members of Congress, from SEC Form 4 filings. Sector: Consumer Staples.
Insider activity at a glance
- Claudine Adamo (President) and 2 others sold $3.8M in the last 90 days.
- Last insider buy: Mary Agnes Wilderotter (Director), $400K, 4 years ago.
- Congress: Richard W. Allen sold $1K to $15K, 5 weeks ago.
Last 12 months: insiders bought $0 (0 buys) and sold $18.3M (14 sales). Last close $998.31 on Oct 21, 2026.
Recent COST insider trades
| Date | Insider | Trade | Value |
|---|---|---|---|
| Oct 13, 2026 | William Richard Wilcox (President) | Sold | $1.1M |
| Sep 29, 2026 | Claudine Adamo (President) | Sold | $2M |
| Sep 29, 2026 | Caton Frates (President) | Sold | $733K |
| Sep 18, 2026 | Richard W. Allen (Representative) | Sold | $1K–15K |
| Sep 10, 2026 | William Richard Wilcox (President) | Sold (not open market) | $1.7M |
| Sep 10, 2026 | Yoram Rubanenko (President) | Sold (not open market) | $1.5M |
| Sep 10, 2026 | Caton Frates (President) | Sold (not open market) | $1.5M |
| Sep 10, 2026 | Pierre Riel (President) | Sold (not open market) | $1.4M |
| Sep 10, 2026 | Teresa A. Jones (President) | Sold (not open market) | $1.3M |
| Sep 10, 2026 | James C Klauer (President) | Sold (not open market) | $845K |
| Sep 10, 2026 | Claudine Adamo (President) | Sold (not open market) | $827K |
| Sep 10, 2026 | Claudine Adamo (President) | Bought (not open market) | — |
| Sep 10, 2026 | William Richard Wilcox (President) | Bought (not open market) | — |
| Sep 10, 2026 | Yoram Rubanenko (President) | Bought (not open market) | — |
| Sep 10, 2026 | Pierre Riel (President) | Bought (not open market) | — |
| Sep 10, 2026 | James C Klauer (President) | Bought (not open market) | — |
| Sep 10, 2026 | Teresa A. Jones (President) | Bought (not open market) | — |
| Sep 10, 2026 | Caton Frates (President) | Bought (not open market) | — |
| Jul 30, 2026 | Richard Dean McCormick (Representative) | Sold | $1K–15K |
| Jul 10, 2026 | Dan Newhouse (Representative) | Bought | $1K–15K |
| Jul 10, 2026 | Jeffrey S Raikes (Director) | Sold (not open market) | — |
| Jun 23, 2026 | Kenneth D Denman (Director) | Sold | $847K |
| Apr 1, 2026 | Caton Frates (President) | Sold | $695K |
| Mar 27, 2026 | Alan Armstrong (Senator) | Bought | $1K–15K |
| Mar 12, 2026 | Sarah Catherine George (President) | Sold (not open market) | $636K |
Who's trading COST
- William Richard Wilcox, President: sold $3.3M (2 sales), last Oct 13, 2026
- Claudine Adamo, President: sold $5.3M (3 sales), last Sep 29, 2026
- Caton Frates, President: sold $1.4M (2 sales), last Sep 29, 2026
- Richard W. Allen, Representative: sold $8K (1 sale), last Sep 18, 2026
- Teresa A. Jones, President: sold $838K (1 sale), last Sep 10, 2026
- James C Klauer, President: sold $1.4M (1 sale), last Sep 10, 2026
- Yoram Rubanenko, President: other filings, last Sep 10, 2026
- Pierre Riel, President: other filings, last Sep 10, 2026
- Richard Dean McCormick, Representative: bought $8K (1 buy), sold $8K (1 sale), last Jul 30, 2026
- Jeffrey S Raikes, Director: other filings, last Jul 10, 2026
- Dan Newhouse, Representative: bought $8K (1 buy), last Jul 10, 2026
- Kenneth D Denman, Director: sold $847K (1 sale), last Jun 23, 2026
- Alan Armstrong, Senator: bought $8K (1 buy), last Mar 27, 2026
- Sarah Catherine George, President: other filings, last Mar 12, 2026
- Gary Millerchip, President: other filings, last Mar 11, 2026
Get free alerts when an insider at Costco Wholesale Corp /new files a new trade →