X0303 4 2010-10-07 0 0000909832 COSTCO WHOLESALE CORP /NEW COST 0001184948 SINEGAL JAMES D 999 LAKE DRIVE ISSAQUAH WA 98027 1 1 0 0 CEO Common Stock 2010-10-07 4 A 0 50000 A 766825 D Common Stock 2010-10-07 4 F 0 6077 65.26 D 760748 D Common Stock 1280649 I By LLC Common Stock 39491 I By GRAT Common Stock 39491 I By Spouse's GRAT Grant was initially made in October 2009 subject to performance conditions concerning fiscal 2010, which have been deemed satisfied by the Compensation Committee of the Board of Directors. The shares of restricted stock subject to performance conditions vest ratably over a four year period from satisfaction based on continued employment with the Company. 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. Deanna K. Nakashima, attorney-in-fact 2010-10-13