Company: COST
Filing Date: 2025-12-04
Form Type: DEF 14A
Source: 0000909832-25-000159
Chunk: 7

Company: COSTCO WHOLESALE CORP /NEW
Filing Date: 2025-12-04
Form: DEF 14A
Chunk 7
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| Financial Expertise: Understanding of financial markets, accounting, and/or financial reporting processes                                                                                                                         |     | •                 |     | •               |     | •                 |     | •                 |     | •      |     |                   |     | •                |     | •               |     |         |     | •                  |
| Retail Industry Experience: Understanding of operational, financial, and strategic issues facing large retail companies                                                                                                           |     | •                 |     |                 |     |                   |     | •                 |     | •      |     |                   |     |                  |     |                 |     | •       |     | •                  |
| Technology or E-commerce: Leadership and expertise in technology, e-commerce and digital platforms                                                                                                                                |     |                   |     | •               |     | •                 |     |                   |     |        |     | •                 |     |                  |     | •               |     |         |     | •                  |
| Risk Management: Governmental public policy, legal and risk management experience and expertise, including data security and/or experience managing cybersecurity and information security risks                                  |     | •                 |     | •               |     | •                 |     | •                 |     | •      |     | •                 |     | •                |     | •               |     | •       |     | •                  |
| Global Operations: Experience at multinational companies or in international markets                                                                                                                                              |     | •                 |     | •               |     | •                 |     | •                 |     |        |     | •                 |     | •                |     | •               |     | •       |     | •                  |
| Marketing and Brand Management: Experience in consumer marketing, sales or brand management                                                                                                                                       |     |                   |     | •               |     |                   |     | •                 |     | •      |     | •                 |     |                  |     | •               |     | •       |     | •                  |

<div align='center'>4</div>

### DIRECTOR BIOGRAPHIES
<div align='center'>Set forth below is information with respect to each director of the Company.</div>

Hamilton E. James has been a director of the Company since August 1988. He was the Lead Independent Director from