Costco Wholesale Corp New (COST) SEC Filing 10-K Annual report for the fiscal year ending Sunday, September 1, 2013

Exhibit 99.1

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COSTCO WHOLESALE CORPORATION REPORTS FOURTH QUARTER AND

FISCAL YEAR 2013 OPERATING RESULTS AND SEPTEMBER SALES RESULTS

ISSAQUAH, Wash., October 9, 2013 - Costco Wholesale Corporation (“Costco” or the “Company”) (Nasdaq: COST) today announced its operating results for the 16-week fourth quarter and the 52-week fiscal year 2013 ended September 1, 2013, and its September sales results for the five weeks ended October 6, 2013.

Net sales for the 16-week fourth quarter were $31.77 billion, an increase of one percent from $31.52 billion in the 17-week fourth quarter of fiscal 2012 ended September 2, 2012. Net sales for the 52-week fiscal year 2013 were $102.87 billion, an increase of six percent from $97.06 billion in the prior 53-week fiscal year.

Comparable sales were as follows:

For the 16-week period, changes in foreign exchange rates had a negative impact on comparable sales. Excluding this impact, comparable sales were as follows:

Net income for the fourth quarter of fiscal 2013 was $617 million, or $1.40 per diluted share, compared to $609 million, or $1.39 per diluted share, during the fourth quarter of fiscal 2012.

Net income for fiscal 2013 was $2.04 billion, or $4.63 per diluted share, compared to $1.71 billion, or $3.89 per diluted share, in fiscal year 2012. Net income for fiscal 2013 was positively impacted by a second quarter $62 million ($.14 per diluted share) tax benefit in connection with the portion of the special cash dividend paid in December 2012 to the Company 401(k) plan participants.

For the five-week reporting month of September, ended October 6, 2013, the Company reported net sales of $9.86 billion, an increase of six percent from $9.33 billion during the similar five-week period last year.

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