Costco Wholesale Corporation reported net sales of $4.53 billion for the month of September, the five weeks ended October 3, 2004, an increase of 11% from $4.07 billion in the same five-week period of the prior fiscal year. On a comparable warehouse basis sales increased 8% during this five-week period. U.S. comp store sales increased 8% and International comp store sales increased 9% in September.

Reported net sales were reduced by the implementation of EITF 03-10. Had sales for the 5-week period last year been reported under EITF 03-10, the total Company reported net sales increase would have been 12 percent and the Company comparable sales increase would have been 9 percent.

Net sales for fiscal 2004, the 52 weeks ended August 29, 2004, were $47.15 billion, an increase of 13% from $41.69 billion during the prior 52-week fiscal year ended August 31, 2003. Comparable warehouse sales increased 10% over the comparable 52-week period of fiscal 2003.