SEC INSIDER TRANSACTIONS

COSTCO WHOLESALE CORP /NEW (COST) Insider Transactions

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COST · COSTCO WHOLESALE CORP /NEW

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OR within codes/roles; AND between categories. Roles apply to buyers and sellers. Owner predicates match the same owner. Missing values fail numeric/date filters. Value is quantity × reported price for non-derivative rows only; derivative values are unknown. Amendments stay separate; joint owners do not duplicate rows.

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Stale snapshot · Covered: filings 2026-10-15 to 2026-11-13 · 19 filings · fetched 2026-11-13T17:01:20Z

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Recent reported activity

0purchase rows on this page

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56matching filing rows

Purchases and sales count original non-derivative P and S rows. Awards, gifts, exercises, derivatives and amendments are shown separately and are not described as market purchases.

Transaction / filed	Reporting owner(s)	Code / security	Quantity	Price as filed	Ownership	Source
2026-10-22Filed 2026-10-26	Vachris Roland MichaelDirector · Officer · President and CEO Filing context 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. 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, 2026. References: F1, F2	A Award / grantCommon Stock · Non-derivative	13,973A	0	Direct	Form 4 ↗0000909832-26-000124
2026-10-22Filed 2026-10-26	MILLERCHIP GARYOfficer · Executive Vice President Filing context 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 one-third on the first anniversary of the grant date and an additional one-third vest over each of the ensuing two years based on continued employment with the Company. 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, 2026. References: F3	F WithholdingCommon Stock · Non-derivative	816.968D	1,018.21	Direct	Form 4 ↗0000909832-26-000125
2026-10-22Filed 2026-10-26	MILLERCHIP GARYOfficer · Executive Vice President Filing context 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 one-third on the first anniversary of the grant date and an additional one-third vest over each of the ensuing two years based on continued employment with the Company. 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, 2026. References: F3	F WithholdingCommon Stock · Non-derivative	500.323D	1,018.21	Direct	Form 4 ↗0000909832-26-000125
2026-10-22Filed 2026-10-26	MILLERCHIP GARYOfficer · Executive Vice President Filing context 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 one-third on the first anniversary of the grant date and an additional one-third vest over each of the ensuing two years based on continued employment with the Company. 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, 2026. References: F3	F WithholdingCommon Stock · Non-derivative	313.451D	1,018.21	Direct	Form 4 ↗0000909832-26-000125
2026-10-22Filed 2026-10-26	MILLERCHIP GARYOfficer · Executive Vice President Filing context 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 one-third on the first anniversary of the grant date and an additional one-third vest over each of the ensuing two years based on continued employment with the Company. 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, 2026. References: F1, F2	A Award / grantCommon Stock · Non-derivative	6,140A	0	Direct	Form 4 ↗0000909832-26-000125
2026-10-22Filed 2026-10-26	Adamo ClaudineOfficer · Executive Vice President Filing context 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	F WithholdingCommon Stock · Non-derivative	108.607D	1,018.21	Direct	Form 4 ↗0000909832-26-000103
2026-10-22Filed 2026-10-26	Adamo ClaudineOfficer · Executive Vice President Filing context 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	F WithholdingCommon Stock · Non-derivative	110.967D	1,018.21	Direct	Form 4 ↗0000909832-26-000103
2026-10-22Filed 2026-10-26	Adamo ClaudineOfficer · Executive Vice President Filing context 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	F WithholdingCommon Stock · Non-derivative	177.058D	1,018.21	Direct	Form 4 ↗0000909832-26-000103
2026-10-22Filed 2026-10-26	Adamo ClaudineOfficer · Executive Vice President Filing context 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	F WithholdingCommon Stock · Non-derivative	198.289D	1,018.21	Direct	Form 4 ↗0000909832-26-000103
2026-10-22Filed 2026-10-26	Adamo ClaudineOfficer · Executive Vice President Filing context 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	F WithholdingCommon Stock · Non-derivative	96.942D	1,018.21	Direct	Form 4 ↗0000909832-26-000103
2026-10-22Filed 2026-10-26	Barbre Tiffany MarieOther Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Grant of Restricted Stock Units. Vests one-fifth on October 22, 2027, and one-fifth annually on October 22 for the following four years. In addition, under the 2019 Stock Incentive Plan, this grant is eligible for accelerated vesting upon the anniversary of the reporting person's 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, 2026. References: F3	F WithholdingCommon Stock · Non-derivative	166.451D	1,018.21	Direct	Form 4 ↗0000909832-26-000105
2026-10-22Filed 2026-10-26	Barbre Tiffany MarieOther Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Grant of Restricted Stock Units. Vests one-fifth on October 22, 2027, and one-fifth annually on October 22 for the following four years. In addition, under the 2019 Stock Incentive Plan, this grant is eligible for accelerated vesting upon the anniversary of the reporting person's 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, 2026. References: F3	F WithholdingCommon Stock · Non-derivative	84.603D	1,018.21	Direct	Form 4 ↗0000909832-26-000105
2026-10-22Filed 2026-10-26	Barbre Tiffany MarieOther Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Grant of Restricted Stock Units. Vests one-fifth on October 22, 2027, and one-fifth annually on October 22 for the following four years. In addition, under the 2019 Stock Incentive Plan, this grant is eligible for accelerated vesting upon the anniversary of the reporting person's 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, 2026. References: F3	F WithholdingCommon Stock · Non-derivative	101.536D	1,018.21	Direct	Form 4 ↗0000909832-26-000105
2026-10-22Filed 2026-10-26	Barbre Tiffany MarieOther Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Grant of Restricted Stock Units. Vests one-fifth on October 22, 2027, and one-fifth annually on October 22 for the following four years. In addition, under the 2019 Stock Incentive Plan, this grant is eligible for accelerated vesting upon the anniversary of the reporting person's 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, 2026. References: F3	F WithholdingCommon Stock · Non-derivative	93.948D	1,018.21	Direct	Form 4 ↗0000909832-26-000105
2026-10-22Filed 2026-10-26	Barbre Tiffany MarieOther Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Grant of Restricted Stock Units. Vests one-fifth on October 22, 2027, and one-fifth annually on October 22 for the following four years. In addition, under the 2019 Stock Incentive Plan, this grant is eligible for accelerated vesting upon the anniversary of the reporting person's 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, 2026. References: F3	F WithholdingCommon Stock · Non-derivative	90.23D	1,018.21	Direct	Form 4 ↗0000909832-26-000105
2026-10-22Filed 2026-10-26	Barbre Tiffany MarieOther Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Grant of Restricted Stock Units. Vests one-fifth on October 22, 2027, and one-fifth annually on October 22 for the following four years. In addition, under the 2019 Stock Incentive Plan, this grant is eligible for accelerated vesting upon the anniversary of the reporting person's 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, 2026. References: F1, F2	A Award / grantCommon Stock · Non-derivative	1,965A	0	Direct	Form 4 ↗0000909832-26-000105
2026-10-22Filed 2026-10-26	DECKER SUSAN LDirector Filing context 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	A Award / grantCommon Stock · Non-derivative	266A	0	Direct	Form 4 ↗0000909832-26-000107
2026-10-22Filed 2026-10-26	DENMAN KENNETH DDirector Filing context 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	A Award / grantCommon Stock · Non-derivative	266A	0	Direct	Form 4 ↗0000909832-26-000109
2026-10-22Filed 2026-10-26	Foulkes HelenaDirector Filing context 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	A Award / grantCommon Stock · Non-derivative	266A	0	Direct	Form 4 ↗0000909832-26-000111
2026-10-22Filed 2026-10-26	George Sarah CatherineOfficer · Executive Vice President Filing context 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	F WithholdingCommon Stock · Non-derivative	46.711D	1,018.21	Direct	Form 4 ↗0000909832-26-000113
2026-10-22Filed 2026-10-26	George Sarah CatherineOfficer · Executive Vice President Filing context 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	F WithholdingCommon Stock · Non-derivative	34.821D	1,018.21	Direct	Form 4 ↗0000909832-26-000113
2026-10-22Filed 2026-10-26	George Sarah CatherineOfficer · Executive Vice President Filing context 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	F WithholdingCommon Stock · Non-derivative	55.774D	1,018.21	Direct	Form 4 ↗0000909832-26-000113
2026-10-22Filed 2026-10-26	George Sarah CatherineOfficer · Executive Vice President Filing context 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	F WithholdingCommon Stock · Non-derivative	62.467D	1,018.21	Direct	Form 4 ↗0000909832-26-000113
2026-10-22Filed 2026-10-26	George Sarah CatherineOfficer · Executive Vice President Filing context 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	F WithholdingCommon Stock · Non-derivative	59.988D	1,018.21	Direct	Form 4 ↗0000909832-26-000113
2026-10-22Filed 2026-10-26	JAMES HAMILTON EDirector Filing context 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	A Award / grantCommon Stock · Non-derivative	266A	0	Direct	Form 4 ↗0000909832-26-000115

Imported instruments only. Joint owners do not multiply transactions. Amendments are separate filing rows, not additional trades. No aggregate trade totals are implied.