| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Klauer James C | Executive Vice President | 999 LAKE DRIVE, ISSAQUAH | /s/ Alejandro Torres, Attorney-in-Fact | 24 Oct 2025 | 0001729360 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | COST | Common Stock | Tax liability | -$227K | -240 | -0.51% | $944.68 | 47K | 22 Oct 2025 | Direct | F1 |
| transaction | COST | Common Stock | Tax liability | -$180K | -191 | -0.41% | $944.68 | 46.8K | 22 Oct 2025 | Direct | F1 |
| transaction | COST | Common Stock | Tax liability | -$188K | -199 | -0.42% | $944.68 | 46.6K | 22 Oct 2025 | Direct | F1 |
| transaction | COST | Common Stock | Tax liability | -$167K | -177 | -0.38% | $944.68 | 46.4K | 22 Oct 2025 | Direct | F1 |
| transaction | COST | Common Stock | Tax liability | -$105K | -111 | -0.24% | $944.68 | 46.3K | 22 Oct 2025 | Direct | F1 |
| holding | COST | Common Stock | 98.5 | 22 Oct 2025 | By Spouse |
| Id | Content |
|---|---|
| F1 | This transaction is a withholding by the Company for taxes in connection with the vesting of previously granted restricted stock units. The price represents the closing market price of Costco common stock on Nasdaq on October 22, 2025. |