Company: COST
Filing Date: 2025-06-27
Form Type: 11-K
Source: 0000909832-25-000038
Chunk: 2

Company: COSTCO WHOLESALE CORP /NEW
Filing Date: 2025-06-27
Form: 11-K
Chunk 2
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 determining whether the information presented in the supplemental schedule reconciles to the financial statements or the underlying accounting and other records, as applicable, and performing procedures to test the completeness and accuracy of the information presented in the supplemental schedule. In forming our opinion on the supplemental schedule, we evaluated whether the supplemental schedule, including its form and content, is presented in conformity with the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. In our opinion, the supplemental schedule is fairly stated in all material respects in relation to the financial statements as a whole.

/s/ Crowe LLP

We have served as the Plan's auditor since 2023.

Oakbrook Terrace, Illinois

June 27, 2025

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#### COSTCO 401(k) RETIREMENT PLAN
<div align='center'>Statements of Net Assets Available for Benefits

December 31, 2024 and 2023

(in thousands)</div>

| Assets:                           |     |                                |     |                                               |     |                   |     | 2024 |            |     | 2023 |            |
|:----------------------------------|:----|:-------------------------------|:----|:----------------------------------------------|:----|:------------------|:----|:-----|-----------:|:----|:-----|-----------:|
|                                   |     | Investments at fair value      |     |                                               |     |                   |     | $    | 38,028,873 |     | $    | 30,435,735 |
|                                   |     | Investments at contract value: |     |                                               |     |                   |     |      |            |     |      |            |
|                                   |     |                                |     | Fully benefit-responsive investment contracts |     |                   |     |      |  1,797,653 |     |      |  1,780,521 |
|                                   |     |                                |     |                                               |     | Total investments |     |      | 39,826,526 |     |      | 32,216,256 |
|                                   |     | Receivables:                   |     |                                               |     |                   |     |      |            |     |      |            |
|                                   |     |                                |     | Notes receivable from participants            |     |                   |     |      |    587,174 |     |      |    559,994 |
|                                   |     |