| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| George Sarah Catherine | Executive Vice President | 999 LAKE DRIVE, ISSAQUAH | /s/ Alejandro Torres, Attorney-in-Fact | 13 Mar 2026 | 0002112687 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | COST | Common Stock | Discretionary transaction in accordance with Rule 16b-3(f) resulting in acquisition or disposition of issuer securities | -642 | -100% | $991.21* | 0 | 12 Mar 2026 | By 401(k) | F1 | |
| holding | COST | Common Stock | 1,401 | 12 Mar 2026 | Direct |
| Id | Content |
|---|---|
| F1 | Reflects a transaction by which the reporting person through an intra-plan transfer disposed of the 642.1252 shares of common stock previously reported as beneficially owned under Costco's 401(k) plan, pursuant to the company's policy prohibiting executive officers from participating in the common stock fund. |