$COST · Costco Wholesale Corporation

This Form 4 filing reports changes in beneficial ownership for James C. Klauer, an Executive Vice President of Costco Wholesale Corporation. On October 22, 2026, Mr. Klauer disposed of a total of 2,101.365 shares of Costco common stock in five separate transactions, all at a price of $1,018.21 per share.

According to the filing, these disposals were not open-market sales by the executive. Instead, they were withholdings by Costco to satisfy tax obligations triggered by the vesting of previously granted restricted stock units. The price listed is the closing market price of Costco common stock on Nasdaq on October 22, 2026.

Following the reported transactions, Mr. Klauer directly owned 45,928.514 shares of Costco common stock. The filing also notes that he indirectly holds an additional 98.5 shares through his spouse.