Washington, D.C. 20549FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIESEXCHANGE ACT OF 1934 For the quarterly period ended February 15, 2026orTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIESEXCHANGE ACT OF 1934 Costco Wholesale Corporation (Exact name of registrant as specified in its charter) 999 Lake Drive, Issaquah, WA 98027(Address of principal executive offices) (Zip Code)(Registrant’s telephone number, including area code):(425)313-8100 Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to besubmitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, asmaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transitionperiod for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).Yes☐No☒ The number of shares outstanding of the issuer's common stock as of March4, 2026, was 443,652,540. COSTCO WHOLESALE CORPORATIONINDEX TO FORM 10-Q PARTIFINANCIAL INFORMATION Item1.Financial Statements Condensed Consolidated Statements of Income PARTIIOTHER INFORMATION Item 1.Legal ProceedingsItem1A.Risk FactorsItem 2.Unregistered Sales of Equity Securities and Use of ProceedsItem 3.Defaults Upon Senior SecuritiesItem 4.Mine Safety DisclosuresItem 5.Other InformationItem 6.ExhibitsSignatures PART I—FINANCIAL INFORMATION COSTCO WHOLESALE CORPORATIONCONDENSED CONSOLIDATED STATEMENTS OF EQUITY COSTCO WHOLESALE CORPORATIONCONDENSED CONSOLIDATED STATEMENTS OF EQUITY COSTCO WHOLESALE CORPORATIONNOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS Note 1—Summary of Significant Accounting Policies Description of Business CostcoWholesale Corporation(Costco or the Company),a Washington corporation,and its subsidiaries operatemembership warehouses based on the concept that offering members low prices on a limited selection of nationally-branded and private-label products in a wide range of merchandise categories will produce high sales volumes and rapidinventory turnover. At February15, 2026, Costco operated924warehouses worldwide:634in the United States (U.S.) Basis of Presentation The condensed consolidated financial statements include the accounts of Costco and its wholly-owned subsidiaries. Allmaterial inter-company transactions among the Company and its consolidated subsidiaries have been eliminated in These unaudited condensed consolidated financial statements have been prepared in accordance with the instructions toForm10-Q for interim financial reporting pursuant to the rules and regulations of the Securities and ExchangeCommission(SEC).While these statements reflect all normal recurring adjustments that are,in the opinion ofmanagement, necessary for fair presentation of the results of the interim period, they do not include all of the information Fiscal Year End The Company operates on a52/53week fiscal year basis, with the fiscal year ending on the Sunday closest to August31.Fiscal2026is a 52-week year ending onAugust30, 2026. References to the second quarter of 2026 and 2025 relate tothe 12-week fiscal quarters ended February15, 2026, andFebruary16, 2025. References to the first half of 2026 and Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates andassumptions that affect: the reported amounts of assets and liabilities and the disclosure of contingent assets andliabilities at the date of the financial statements; and the reported amounts of revenues and expenses during the reporting Recent Accounting Pronouncements Not Yet Adopted By The Company In December 2023, the Financial Accounting Standards Board (FASB) issued ASU 2023-09, which requires publicbusiness entities on an annual basis to disclose specific categories in the income-tax rate reconciliation, provide certain information about income taxes paid. The standard is effective for annual periods beginning after December 15, In November 2024, the FASB issued ASU 2024-03, which requires disaggregated disclosures of certain costs andexpenses on the income statement on an annual and interim basis. The standard is effective for fiscal years beginning These standards should be applied on a prospective basis. Retrospective application is permitted. The Company isevaluating these standards. Note 2—Investments Gross unrealized holding gains and losses on available-for-sale securities were not material for the periods endedFebruary15, 2026, or Augus