Costco Wholesale : Shareholders' Meeting

About this update from Costco Wholesale Corporation

Costco Annual Meeting of Shareholders Thursday, January 15, 2026, 2:00 pm Pacific Time Virtual Event Rules of Conduct & FAQs Location: Our 2026 Annual Meeting will be held in a virtual format only. Shareholders can participate from any location with Internet connectivity. Time: The meeting begins at 2:00 pm PT. The on-line site will be available at 1:30 pm PT. The meeting and business presentation will last approximately one hour, including the period for questions following the official meeting. Instructions for accessing: Use this link: https://www.virtualshareholdermeeting.com/COST2026 . Recording of the Annual Meeting is prohibited. How do I cast my proxy vote? Shareholders can vote their shares before the meeting online at https://www.proxyvote.com , by calling 1-800-690-6903, by mailing a completed proxy card, or by mobile device by scanning the QR code on the proxy card or Notice of Internet Availability of Proxy Materials. Shareholders may also vote online during the virtual meeting at https://www.virtualshareholdermeeting.com/COST2026 . If you have voted your shares prior to the start of the Annual Meeting, your vote has been received by the Company's inspector of Elections, and there is no need to vote those shares during the Annual Meeting, unless you wish to revoke or change your vote. Where can I find the bylaws? o Our bylaws describe requirements for the meeting, and the Chair of the Annual Meeting will conduct the meeting consistent with those requirements. The bylaws are available here: https://www.sec.gov/Archives/edgar/data/909832/000090983224000039/costex3 28-k91624.htm What will the program be? Hamilton James, Chairman of the Board, will conduct the official business of the annual meeting: election of directors; ratification of the selection of KPMG as the Company's independent auditor; advisory vote concerning executive compensation; and, if properly presented, the shareholder proposal. Following adjournment of the formal business of the Annual Meeting, CEO and President Ron Vachris will give a presentation about the Company's business. At the conclusion of this presentation, he will address appropriate general questions from shareholders. Questions may be submitted in the field provided in the web portal during the Annual Meeting. How do I ask a question? Only our shareholders are permitted to ask questions during the Annual Meeting. You need to have held stock as of the close of business on the record date of November 7, 2025 to vote or submit questions while participating in the virtual Annual Meeting. Shareholders who wish to ask questions or make comments must enter the 16-digit control number found on the Notice of Internet Availability of Proxy Materials or on the proxy card or voting instruction form provided to you with the Proxy Statement. Please identify yourself when asking a question or making a comment. We will limit each shareholder to two questions. It will help us if questions are succinct and cover only one topic per question. Questions from multiple shareholders on the same topic or that are otherwise related may be grouped, summarized and answered together. In the judgment of the Chair, inappropriate questions will not be answered. Time constraints may not allow for all questions to be answered.

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