$COST · Costco Wholesale Corporation

A Form 4 filing from Costco Wholesale Corporation reports changes in beneficial ownership for Mary Agnes Wilderotter, a director of the company. On October 22, 2026, she acquired 266 restricted stock units at no cost. Those units vest in three equal annual installments beginning on October 22, 2027. After the reported transaction, she directly held 8,526.936 shares of Costco common stock.

The filing also shows that Wilderotter indirectly held 4,696 shares through a grantor retained annuity trust called GRAT-1, for which she is the sole grantor, trustee, and annuity beneficiary. It further notes that on July 21, 2026, 5,056 shares of Costco common stock were distributed to her from that trust in payment of an annuity. The form was signed on her behalf by an attorney-in-fact on October 26, 2026.