X0607 3/A 2026-08-31 2026-09-10 0 0000909832 COSTCO WHOLESALE CORP /NEW COST 0002150337 Self Adam Webb false 999 LAKE DRIVE ISSAQUAH WA 98027 1 Executive Vice President Common Stock 3529.352 D 2.52 shares were inadvertently omitted from the reporting person's Form 3 filed on September 10, 2026. /s/ Alejandro Torres, Attorney-in-Fact 2026-09-30