X0306 4 2022-10-22 0 0000909832 COSTCO WHOLESALE CORP /NEW COST 0001902272 Sullivan John Christopher 999 LAKE DRIVE ISSAQUAH WA 98027 0 1 0 0 Executive VP Common Stock 2022-10-22 4 F 0 473 478.18 D 37305 D Common Stock 2022-10-22 4 F 0 529 478.18 D 36776 D Common Stock 2022-10-22 4 F 0 506 478.18 D 36270 D Common Stock 2022-10-22 4 F 0 414 478.18 D 35856 D Common Stock 2022-10-22 4 F 0 565 478.18 D 35291 D 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 21, 2022. Gail E. Tsuboi, Attorney-In-Fact 2022-10-25