| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Miller Russell D | Sr. Executive Vice President | 999 LAKE DRIVE, ISSAQUAH | /s/ Alejandro Torres, Attorney-in-Fact | 24 Sep 2025 | 0001729741 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | COST | Common Stock | Gift | $0 | -2,918 | -100% | $0.000000 | 2 | 23 Sep 2025 | Direct | |
| transaction | COST | Common Stock | Gift | $0 | +2,918 | +29% | $0.000000 | 13,120 | 23 Sep 2025 | Miller Family Trust |