John Christopher Sullivan - 22 Oct 2026 Form 4 Insider Report for COSTCO WHOLESALE CORP /NEW (COST)

Reporting relationship: Executive VP
Issuer ticker: COST
Reported as of: 22 Oct 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 27 Oct 2026, 16:16:05 UTC
Prior SEC filing: 24 Oct 2025
Source filing: View source filing
Reporting owner signature: /s/ Alejandro Torres, Attorney-in-Fact

Filing notes and source

Key filing fact

John Christopher Sullivan filed Form 4 for COSTCO WHOLESALE CORP /NEW (COST) on 27 Oct 2026.

Key facts

This page summarizes John Christopher Sullivan's Form 4 filing for COSTCO WHOLESALE CORP /NEW (COST).
6 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 27 Oct 2026, 16:16.

Change

Previous filing in this sequence was filed on 24 Oct 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 0001902272 Primary reporting owner

Sullivan John Christopher

Relationship: Executive VP
Address: 999 LAKE DRIVE, ISSAQUAH
Signature: /s/ Alejandro Torres, Attorney-in-Fact
Signature date: 26 Oct 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 %: +9.5%
Price: $0.000000^*
Shares after: 52,223
Date: 22 Oct 2026
Ownership: Direct
Footnotes: F1, F2

COST transaction

Common Stock

Tax liability

Transaction value
Shares: -573
Change %: -1.1%
Price: $1018.21^*
Shares after: 51,650
Date: 22 Oct 2026
Ownership: Direct
Footnotes: F3

COST transaction

Common Stock

Tax liability

Transaction value
Shares: -647
Change %: -1.3%
Price: $1018.21^*
Shares after: 51,003
Date: 22 Oct 2026
Ownership: Direct
Footnotes: F3

COST transaction

Common Stock

Tax liability

Transaction value
Shares: -975
Change %: -1.9%
Price: $1018.21^*
Shares after: 50,028
Date: 22 Oct 2026
Ownership: Direct
Footnotes: F3

COST transaction

Common Stock

Tax liability

Transaction value
Shares: -732
Change %: -1.5%
Price: $1018.21^*
Shares after: 49,296
Date: 22 Oct 2026
Ownership: Direct
Footnotes: F3

COST transaction

Common Stock

Tax liability

Transaction value
Shares: -836
Change %: -1.7%
Price: $1018.21^*
Shares after: 48,460
Date: 22 Oct 2026
Ownership: Direct
Footnotes: F3

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 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, this grant is eligible for accelerated vesting upon the anniversary of the reporting person's 25th, 30th and 35th years of service.

Footnote F2

Not applicable. Grant of Restricted Stock Units.

Footnote F3

This transaction is a withholding by the Company for taxes in connection with the vesting of previously granted restricted stock units. The price represents the closing market price of Costco common stock on Nasdaq on October 22, 2026.