| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Miller Russell D | Sr. Executive Vice President | 999 LAKE DRIVE, ISSAQUAH | /s/ Alejandro Torres, Attorney-in-Fact | 12 Jan 2026 | 0001729741 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | COST | Common Stock | Sale | $1,374,480 | -1,500 | -15% | $916.32 | 8,240 | 09 Jan 2026 | Miller Family Trust | |
| holding | COST | Common Stock | 1 | 09 Jan 2026 | Direct |