X0306 4 2022-10-22 0 0000909832 COSTCO WHOLESALE CORP /NEW COST 0001688921 Hines Daniel M. 999 LAKE DRIVE ISSAQUAH WA 98027 0 0 0 1 Principal Acctg Officer Common Stock 2022-10-22 4 A 0 3784 A 16891.65 D Common Stock 2022-10-22 4 F 0 158 478.18 D 16733.65 D Common Stock 2022-10-22 4 F 0 114 478.18 D 16619.65 D Common Stock 2022-10-22 4 F 0 91 478.18 D 16528.65 D Common Stock 2022-10-22 4 F 0 75 478.18 D 16453.65 D Common Stock 2022-10-22 4 F 0 60 478.18 D 16393.65 D Common Stock 2022-10-22 4 F 0 985 478.18 D 15408.65 D Grant of Restricted Stock Units. Vests one-fifth on October 22, 2022, and one-fifth annually on October 22 for the following four years. In addition, under the Stock Incentive Plan, long term employees are eligible for accelerated vesting upon the anniversary of their 25th, 30th and 35th years of service. Not applicable. Grant of Restricted Stock Units. 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