X0306 4 2012-10-17 0 0000909832 COSTCO WHOLESALE CORP /NEW COST 0001278889 WALKER THOMAS KIRK 999 LAKE DRIVE ISSAQUAH WA 98027 0 1 0 0 Executive VP Common Stock 2012-10-17 4 F 0 1650 96.78 D 267695 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 17, 2012. Deanna K. Nakashima, attorney-in-fact 2012-10-19