Company: COST
Filing Date: 2025-12-04
Form Type: DEF 14A
Source: 0000909832-25-000159
Chunk: 0

Company: COSTCO WHOLESALE CORP /NEW
Filing Date: 2025-12-04
Form: DEF 14A
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549
#### _____________________________

#### SCHEDULE 14A

#### Proxy Statement Pursuant to Section 14(a) of the

#### Securities Exchange Act of 1934
<div align='center'>(Amendment No. )</div>

#### _____________________________

Filed by the Registrant ☒ Filed by a party other than the Registrant ☐

Check the appropriate box:

| ☐ |     | Preliminary Proxy Statement |

| ☐ |     | Confidential, for Use of the Commission Only (as Permitted by Rule 14a-6(e)(2)) |

| ☒ |     | Definitive Proxy Statement |

| ☐ |     | Definitive Additional Materials |

| ☐ |     | Soliciting Material under §240.14a-12 |

#### Costco Wholesale Corporation
<div align='center'>(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

Payment of Filing Fee (Check all boxes that apply):

| ☒ |     | No fee required |

| ☐ |     | Fee paid previously with preliminary materials |

| ☐ |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

#### 999 Lake Drive
<div align='center'>Issaquah, Washington 98027</div>

<div align='center'>NOTICE OF ANNUAL MEETING OF SHAREHOLDERS</div>

TO OUR SHAREHOLDERS:

The Annual Meeting of the Shareholders of Costco Wholesale Corporation (the “Company”) will be held by live webcast, on Thursday, January 15, 2026, at 2:00 p.m. Pacific time, to:

1. Elect the ten directors nominated by the Board of Directors to hold office until the 2027 Annual Meeting of Shareholders and until their successors are elected and qualified;

2. Ratify the selection of KPMG LLP ("KPMG") as the Company’s independent auditors for fiscal 2026;

3. Approve, on an advisory basis, the compensation of the Company’s named executive officers for fiscal 2025 as disclosed in these materials;

4. Vote on the shareholder proposal described in the accompanying proxy statement, if properly presented at the meeting; and

5