Company: COST
Filing Date: 2025-12-04
Form Type: DEF 14A
Source: 0000909832-25-000159
Chunk: 18

Company: COSTCO WHOLESALE CORP /NEW
Filing Date: 2025-12-04
Form: DEF 14A
Chunk 18
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 encouraged to attend meetings of shareholders. All directors attended the meeting in 2025.

### PRINCIPAL SHAREHOLDERS
The following table sets forth information regarding ownership of the common stock by each person or group known to the Company to own more than 5% of the outstanding shares of the common stock on November 7, 2025.

| Name and Address of Beneficial Owner |     | Shares        |     | Percent1 |
| Vanguard Group, Inc.                 |     | 43,455,368(2) |     | 9.79%    |
| 100 Vanguard Blvd.,                  |     |               |     |          |
| Malvern, PA 19355                    |     |               |     |          |
| BlackRock, Inc.                      |     | 34,781,929(3) |     | 7.83%    |
| 50 Hudson Yards                      |     |               |     |          |
| New York, NY 10001                   |     |               |     |          |

_______________________

(1) Based on 443,957,682 shares of common stock outstanding. In accordance with SEC rules, percent of class as of this date is calculated for each person and group by dividing the number of shares beneficially owned by the sum of the total shares outstanding plus the number of shares subject to securities exercisable by that person or group within 60 days.

(2) Information based on Form 13F-HR filed with the SEC by Vanguard Group, Inc. on November 7, 2025.

(3) Information based on Form 13F-HR filed with the SEC by BlackRock, Inc. on November 12, 2025.

<div align='center'>11</div>

The following table sets forth the shares of the common stock owned on November 7, 2025 by each director, each nominee for election as a director, the executive officers named in the Summary Compensation Table, and all directors and executive officers as a group .

| Name of Beneficial Owner                                     |     | Shares Beneficially Owned1 |     | Percent of Class2 |
| Ron M. Vachris                                               |     |                     52,258 |     | *                 |
| Susan L. Decker                                              |     |                     11,817 |     | *                 |
| Kenneth D. Denman                                            |     |                      5,989 |     | *                 |
| Helena B. Foulkes