X0306 4 2019-10-22 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 2019-10-22 4 F 0 186 299.97 D 22276.65 D Common Stock 2019-10-22 4 F 0 236 299.97 D 22040.65 D Common Stock 2019-10-22 4 F 0 334 299.97 D 21706.65 D Common Stock 2019-10-22 4 F 0 465 299.97 D 21241.65 D Common Stock 2019-10-22 4 F 0 361 299.97 D 20880.65 D Common Stock 2019-10-22 4 A 0 5470 A 26350.65 D Common Stock 2019-10-22 4 F 0 719 299.97 D 25631.65 D Common Stock 2019-10-23 4 S 0 5000 298.4568 D 20631.65 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 22, 2019. Grant of Restricted Stock Units. Vests one-fifth on October 22, 2019, 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. The price shown is a weighted average sale price for shares sold in multiple transactions; the sale prices ranged from $298.4558 to $298.5036 per share. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range. Deanna K. Nakashima, attorney-in-fact 2019-10-24