Company: COST
Filing Date: 2025-12-04
Form Type: DEF 14A
Source: 0000909832-25-000159
Chunk: 4

Company: COSTCO WHOLESALE CORP /NEW
Filing Date: 2025-12-04
Form: DEF 14A
Chunk 4
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 and employees of the Company may, without being additionally compensated, solicit proxies by mail, telephone, email or personal contact. All proxy-soliciting expenses will be paid by the Company in connection with the solicitation of votes for the Annual Meeting. Alliance Advisors may solicit proxies at a cost we anticipate will not exceed $15,000.

#### Participating in the Annual Meeting
We are conducting a virtual Annual Meeting. Shareholders can participate from any location with Internet connectivity.

• To participate in the Annual Meeting, including to vote and to view the list of registered shareholders as of the record date during the meeting, you must access the meeting website at www.virtualshareholdermeeting.com/COST2026 and 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 this Proxy Statement.

• Whether or not you plan to participate in the Annual Meeting, it is important that your shares be represented and voted. We encourage you to access www.proxyvote.com or call 1-800-690-6903 and vote in advance of the Annual Meeting.

• Shareholders are able to submit questions for the Annual Meeting’s question and answer session before and during the meeting through www.virtualshareholdermeeting.com/COST2026. When submitting questions shareholders must identify themselves and provide contact information. We will respond as practical to appropriate questions during the meeting. A recording of the event and responses to unanswered questions (consolidating repetitive questions) will be posted and available after the meeting at https://investor.costco.com. Additional information regarding the rules and procedures for participating in the Annual Meeting will be set forth in our meeting rules of conduct, which shareholders can view during the meeting at the meeting website and during the ten days prior to the meeting at www.proxyvote.com.

• We encourage you to access the Annual Meeting before it begins. Online check-in will be available approximately 15 minutes before the meeting starts. If you have difficulty accessing the meeting, please call 844-986-0822 (toll free) or 303-562-9302 (international).

• Closed captioning will be available for the meeting. For assistance with accommodations please email us at investor@costco.com by January 14, 2026.

#### Note about Forward-Looking Statements
Certain statements in this Proxy Statement, other than purely historical information, including estimates, projections, statements relating to our business plans, objectives and expected operating results, statements regarding our environmental and other sustainability plans and