X0306 4 2017-06-06 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 2017-06-06 4 S 0 5000 181.3196 D 28785.65 D The price shown is a weighted average sale price for shares sold in multiple transactions; the sale prices ranged from $181.31 to $181.34 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 2017-06-06