Transaction Details

Footnotes

Grant of Restricted Stock Units. Vests one-fifth on October 22, 2026, and one-fifth annually on October 22 for the following four years. In addition, under the Stock Incentive Plan, employees are eligible for accelerated vesting upon the anniversary of their 25th, 30th and 35th years of service. | Not applicable. Grant of Restricted Stock Units. | 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, 2025. | The price shown is a weighted average price for shares sold in multiple transactions; the sale prices ranged from $934.47 to $934.84 per share. The reporting person will provide the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range. | 2.1788 shares inadvertently omitted from the reporting person's Form 3 filed on July 10, 2025.