Tiffany Marie Barbre - Oct 22, 2025 Form 4 Insider Report for COSTCO WHOLESALE CORP /NEW (COST)

Role
Principal Accounting Officer
Signature
/s/ Alejandro Torres, Attorney-in-Fact
Stock symbol
COST
Transactions as of
Oct 22, 2025
Transactions value $
-$1,670,671
Form type
4
Date filed
10/24/2025, 07:50 PM
Previous filing
Jul 10, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Barbre Tiffany Marie Principal Accounting Officer 999 LAKE DRIVE, ISSAQUAH /s/ Alejandro Torres, Attorney-in-Fact 2025-10-24 0002076006

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction COST Common Stock Award $0 +2.12K +43.95% $0.00 6.94K Oct 22, 2025 Direct F1, F2
transaction COST Common Stock Tax liability -$107K -114 -1.64% $944.68 6.82K Oct 22, 2025 Direct F3
transaction COST Common Stock Tax liability -$85.2K -90.2 -1.32% $944.68 6.73K Oct 22, 2025 Direct F3
transaction COST Common Stock Tax liability -$112K -119 -1.76% $944.68 6.61K Oct 22, 2025 Direct F3
transaction COST Common Stock Tax liability -$128K -135 -2.05% $944.68 6.48K Oct 22, 2025 Direct F3
transaction COST Common Stock Tax liability -$79.9K -84.6 -1.31% $944.68 6.39K Oct 22, 2025 Direct F3
transaction COST Common Stock Sale -$1.16M -1.24K -19.38% $934.62 5.16K Oct 24, 2025 Direct F4
holding COST Common Stock 2.18 Oct 22, 2025 By 401(k) F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 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.
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 22, 2025.
F4 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.
F5 2.1788 shares inadvertently omitted from the reporting person's Form 3 filed on July 10, 2025.