Form 4

Sullivan John Christopher

Officer (Executive VP)

Table I: shares of stock

Line	Security	Trade date	Shares	Price	Value	Owned after	Ownership	Notes
GrantedLine 1 · code A	Common Stock	10/22/23	7,429Acquired	—	— No price on filing	42,720	Direct	F1, F2
Withheld for taxesLine 2 · code F	Common Stock	10/22/23	361.842Disposed	$552.93	$200,073.30	42,358.158	Direct	F3
Withheld for taxesLine 3 · code F	Common Stock	10/22/23	503.305Disposed	$552.93	$278,292.43	41,854.853	Direct	F3
Withheld for taxesLine 4 · code F	Common Stock	10/22/23	505.254Disposed	$552.93	$279,370.09	41,349.599	Direct	F3
Withheld for taxesLine 5 · code F	Common Stock	10/22/23	413.963Disposed	$552.93	$228,892.56	40,935.636	Direct	F3
Withheld for taxesLine 6 · code F	Common Stock	10/22/23	562.705Disposed	$552.93	$311,136.48	40,372.931	Direct	F3

F1
Grant was initially made on October 22, 2022 subject to performance conditions concerning fiscal 2023, 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, long term employees are eligible for accelerated vesting upon the anniversary of their 25th, 30th and 35th years of service.
F2
Not applicable. Grant of Restricted Stock Units.
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 20, 2023.

Exhibit 24: Power of Attorney provided herewith.