Costco Wholesale Corporation reported net sales of $4.09 billion for the four weeks ended August 28, 2005, an increase of 12% from $3.64 billion in the same four-week period of the prior fiscal year.
For the 16-week fiscal fourth quarter ended August 28, 2005, the Company reported net sales of $16.37 billion, an increase of 10 percent from $14.83 billion during last year's fiscal fourth quarter.

For the 52-week fiscal year ended August 28, 2005, the Company reported net sales of $51.87 billion, an increase of 10 percent from $47.15 billion during the prior fiscal year.

Comparable sales for the 4-week, 16-week and 52-week periods ended August 28, 2005, were as follows:

                          4 Weeks         16 Weeks        52 Weeks
                      ---------------- --------------- ---------------
US                           9%              6%              6%
International               11%              12%             11%

Total Company                9%              7%              7%
                      ================ =============== ===============

Reported net sales were reduced by the implementation of Emerging Issues Task Force Issue No. 03-10 (“EITF 03-10”), “Application of Issue No. 02-16 by Resellers to Sales Incentives Offered to Consumers by Manufacturers,” which was effective at the beginning of the Company's fiscal 2004 third quarter, February 16, 2004. Sales for the 4-week and 16-week reporting periods are on a comparable after-coupon basis; however, had sales for the 52-week fiscal year 2004 been reported under EITF 03-10, the total Company comparable sales increase would have been 8%.