COSTCO WHOLESALE CORP /NEW (COST) Insider Transactions

Reported filing row; may be amended. Do not sum filings blindly.

F1 Grant of Restricted Stock Units. Vests one-third on October 22, 2027, and one-third annually on October 22 for the following two years.

F2 Not applicable. Grant of Restricted Stock Units.

References: F1, F2

Reported filing row; may be amended. Do not sum filings blindly.

F1 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, 2026.

References: F1

Reported filing row; may be amended. Do not sum filings blindly.

F1 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, 2026.

References: F1

Reported filing row; may be amended. Do not sum filings blindly.

F1 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, 2026.

References: F1

Reported filing row; may be amended. Do not sum filings blindly.

F1 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, 2026.

References: F1

Reported filing row; may be amended. Do not sum filings blindly.

F1 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, 2026.

References: F1

Reported filing row; may be amended. Do not sum filings blindly.

References:

Reported filing row; may be amended. Do not sum filings blindly.

References:

Reported filing row; may be amended. Do not sum filings blindly.

References:

Reported filing row; may be amended. Do not sum filings blindly.

F1 Grant was initially made on October 22, 2025, subject to performance conditions concerning fiscal 2026, 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, 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.

References:

Reported filing row; may be amended. Do not sum filings blindly.

F1 Grant was initially made on October 22, 2025, subject to performance conditions concerning fiscal 2026, 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, 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.

References: F1, F2

Reported filing row; may be amended. Do not sum filings blindly.

F1 Grant was initially made on October 22, 2025, subject to performance conditions concerning fiscal 2026, 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, 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.

References:

Reported filing row; may be amended. Do not sum filings blindly.

F1 Grant was initially made on October 22, 2025, subject to performance conditions concerning fiscal 2026, 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, 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.

References: F1, F2

Reported filing row; may be amended. Do not sum filings blindly.

F1 Grant was initially made on October 22, 2025, subject to performance conditions concerning fiscal 2026, 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, 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.

References:

Reported filing row; may be amended. Do not sum filings blindly.

F1 Grant was initially made on October 22, 2025, subject to performance conditions concerning fiscal 2026, 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, 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.

References: F1, F2

Reported filing row; may be amended. Do not sum filings blindly.

F1 Grant was initially made on October 22, 2025, subject to performance conditions concerning fiscal 2026, 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, 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.

References:

Reported filing row; may be amended. Do not sum filings blindly.

F1 Grant was initially made on October 22, 2025, subject to performance conditions concerning fiscal 2026, 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, 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.

References: F1, F2

Reported filing row; may be amended. Do not sum filings blindly.

F1 Grant was initially made on October 22, 2025, subject to performance conditions concerning fiscal 2026, 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, 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.

References:

Reported filing row; may be amended. Do not sum filings blindly.

F1 Grant was initially made on October 22, 2025, subject to performance conditions concerning fiscal 2026, 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, 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.

References: F1, F2

Reported filing row; may be amended. Do not sum filings blindly.

F1 Grant was initially made on October 22, 2025, subject to performance conditions concerning fiscal 2026, 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, 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.

References:

Reported filing row; may be amended. Do not sum filings blindly.

F1 Grant was initially made on October 22, 2025, subject to performance conditions concerning fiscal 2026, 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, 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.

References: F1, F2

Reported filing row; may be amended. Do not sum filings blindly.

F1 Grant was initially made on October 22, 2025, subject to performance conditions concerning fiscal 2026, 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, 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.

References:

Reported filing row; may be amended. Do not sum filings blindly.

F1 Grant was initially made on October 22, 2025, subject to performance conditions concerning fiscal 2026, 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, 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.

References: F1, F2

Reported filing row; may be amended. Do not sum filings blindly.

F1 Gift to a non-profit foundation.

References: F1

Reported filing row; may be amended. Do not sum filings blindly.

F1 The price shown is a weighted average price for shares sold in multiple transactions; the sale prices ranged from $957.44 to $957.63 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.

References: F1