Pierre Riel - 10 Sep 2026 Form 4 Insider Report for COSTCO WHOLESALE CORP /NEW (COST)

Reporting relationship: Executive Vice President
Issuer ticker: COST
Reported as of: 10 Sep 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 14 Sep 2026, 17:25:36 UTC
Prior SEC filing: 12 Sep 2025
Source filing: View source filing
Reporting owner signature: /s/ Alejandro Torres, Attorney-in-Fact

Filing notes and source

Key filing fact

Pierre Riel filed Form 4 for COSTCO WHOLESALE CORP /NEW (COST) on 14 Sep 2026.

Key facts

This page summarizes Pierre Riel's Form 4 filing for COSTCO WHOLESALE CORP /NEW (COST).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 14 Sep 2026, 17:25.

Change

Previous filing in this sequence was filed on 12 Sep 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001916969 Primary reporting owner

Riel Pierre

Relationship: Executive Vice President
Address: 999 LAKE DRIVE, ISSAQUAH
Signature: /s/ Alejandro Torres, Attorney-in-Fact
Signature date: 14 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

COST transaction

Common Stock

Award

Transaction value
Shares: +4,552
Change %: +40%
Price: $0.000000^*
Shares after: 15,808
Date: 10 Sep 2026
Ownership: Direct
Footnotes: F1, F2

COST transaction

Common Stock

Tax liability

Transaction value
Shares: -1,562
Change %: -9.9%
Price: $902.38^*
Shares after: 14,246
Date: 10 Sep 2026
Ownership: Direct

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Grant was initially made on October 22, 2025, subject to performance conditions concerning fiscal 2026, which have been deemed satisfied by the Compensation Committee of the Board of Directors. The earned awards vest 20% on the first anniversary of the grant date and an additional 20% vest over each of the ensuing four years based on continued employment with the Company. In addition, under the 2019 Incentive Plan, employees are eligible for accelerated vesting upon the anniversary of their 25th, 30th and 35th years of service.

Footnote F2

Not applicable. Grant of Restricted Stock Units.