Company: COST
Filing Date: 2025-12-04
Form Type: DEF 14A
Source: 0000909832-25-000159
Chunk: 1

Company: COSTCO WHOLESALE CORP /NEW
Filing Date: 2025-12-04
Form: DEF 14A
Chunk 1
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. Transact such other business as may properly come before the meeting or any adjournments thereof.

Our 2026 Annual Shareholders' Meeting will be held in a virtual format only, and shareholders can participate from any location with Internet connectivity. We believe this enhances accessibility and reduces our carbon footprint. Shareholders may view a live webcast of the Annual Meeting and submit questions digitally prior to and during the meeting at www.virtualshareholdermeeting.com/COST2026. Please refer to the "Participating in the Annual Meeting" section of the Proxy Statement for more details.

Shareholders can vote their shares before the meeting online at 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 www.virtualshareholdermeeting.com/COST2026.

Only shareholders of record at the close of business on November 7, 2025, are entitled to notice of and to vote at the meeting. All shareholders are requested to be present virtually or by proxy. Any shareholder giving a proxy may revoke it at any time before it is voted.

Important Notice Regarding the Availability of Proxy Materials for the 2026 Annual Meeting. We are mailing to many of our shareholders a Notice of Internet Availability of Proxy Materials, rather than a full paper set of the materials. The notice contains instructions on how to access our proxy materials online, as well as instructions on obtaining a paper copy by mail or electronic copy by email. All shareholders who do not receive such a notice, including shareholders who have previously requested to receive a paper copy, will receive a full set of paper proxy materials by U.S. mail or an electronic copy by email. This process reduces our carbon footprint and our costs to print and distribute materials.

Voting by the Internet or telephone is fast and convenient, and your vote is immediately confirmed and tabulated. If you receive a paper copy of the proxy materials, you may also vote by completing, signing, dating and returning the accompanying proxy card in the enclosed return envelope furnished for that purpose. By using the Internet or telephone you help the Company reduce postage and proxy tabulation costs.

<div align='center'>Please do not return the enclosed paper ballot if you are</div>

#### voting over the Internet or by telephone.
You may also vote online during the meeting at www.virtualshareholdermeeting.com/COST2026.

Your cooperation is