Costco Wholesale Corp

COST · 8-K · Filed May 28 · 16:170000909832-26-000046Read the filing ›Open on SEC EDGAR

Exhibit 99.1

costex9918-k52826.htm

Document Exhibit 99.1

Press Release COSTCO WHOLESALE CORPORATION REPORTS THIRD QUARTER AND YEAR-TO-DATE OPERATING RESULTS FOR FISCAL 2026 ISSAQUAH, Wash., May 28, 2026 - Costco Wholesale Corporation (“Costco” or the “Company”) (Nasdaq: COST) today announced its operating results for the third quarter (twelve weeks) and the first 36 weeks of fiscal 2026, ended May 10, 2026.

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Net sales for the quarter increased 11.6 percent, to $69.15 billion, from $61.96 billion last year. Net sales for the first 36 weeks increased 9.6 percent, to $203.37 billion, from $185.48 billion last year.

Comparable sales for the third quarter and first 36 weeks of fiscal 2026 were as follows:

12 Weeks 12 Weeks 36 Weeks 36 Weeks Adjusted* Adjusted* U.S.

Total Company 9.8% 6.6% 7.9% 6.6%

Digitally-Enabled 21.5% 20.8% 21.6% 21.1% *Excluding the impacts from changes in gasoline prices and foreign exchange.

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Costco Wholesale Corp

Exhibit 99.1

Compared with earlier periods