Company: COST
Filing Date: 2025-06-27
Form Type: 11-K
Source: 0000909832-25-000038
Chunk: 22

Company: COSTCO WHOLESALE CORP /NEW
Filing Date: 2025-06-27
Form: 11-K
Chunk 22
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108 |
|                                                                        |     | Total fully benefit-responsive contracts |     |                                                 |     |                                                         |     |          |     |    |     |                   |  1,797,653 |
|                                                                        |     | * Costco Wholesale Corporation           |     |                                                 |     | Common stock                                            |     |          |     | ** |     |                   | 21,006,481 |
| Total investments                                                      |     |                                          |     |                                                 |     |                                                         |     |          |     |    |     |                   | 39,826,526 |
| * Participant loans                                                    |     |                                          |     |                                                 |     | Interest rates of 4.25% to 10.50% maturing through 2039 |     |          |     | __ |     |                   |    587,174 |
| Total                                                                  |     |                                          |     |                                                 |     |                                                         |     |          |     |    |     | $                 | 40,413,700 |
| _________________________                                              |     |                                          |     |                                                 |     |                                                         |     |          |     |    |     |                   |            |
| * Indicates a party-in-interest                                        |     |                                          |     |                                                 |     |                                                         |     |          |     |    |     |                   |            |
| ** Information is not required as investments are participant directed |     |                                          |     |                                                 |     |                                                         |     |          |     |    |     |                   |            |

<div align='center'>See accompanying report of independent registered public accounting firm.

23</div>

### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized.

| June 27, 2025 |     | By: | COSTCO401(k) RETIREMENTPLAN  
 /s/ PATRICKJ. CALLANS        |
|:--------------|:----|:----|:-----------------------------|
| Date          |     |     | Patrick J. Callans           
 Executive Vice President     
 Costco Wholesale Corporation |

<div align='center'>24</div>