Costco Wholesale EVP John Christopher Sullivan Acquires 4,552 Shares via Performance Grant

Insider Transaction Overview

On October 22, 2026, John Christopher Sullivan, Executive Vice President of Costco Wholesale Corp ($COST), reported transactions involving Common Stock pursuant to equity compensation plans:

1. Performance Share Award (Code A):

   • Shares Acquired: 4,552 shares
   • Price per Share: $0.00
   • Nature: Grant initially made on October 22, 2025, subject to fiscal 2026 performance conditions deemed satisfied by the Compensation Committee. Shares vest 20% on the first anniversary and an additional 20% over each of the following four years.

2. Tax Withholdings (Code F):

   • Across five separate vesting tranches, a cumulative total of 3,763.249 shares were withheld by the company to satisfy statutory tax obligations at the closing market price of $1,018.21 per share on October 22, 2026.
   • Total Withheld Value: ~$3,831,777

Ownership Impact

Following these transactions, Sullivan directly owns 48,459.895 shares of Costco common stock.

Market & Trading Significance

This filing reflects standard executive equity compensation settlement and routine tax withholding. Because there were no open-market purchases or sales, this filing carries Low trading significance.