| 2025-12-17 | 10-Q | 10.4 | 2019 Stock Incentive Plan Restricted Stock Unit Award Agreement - Non-U.S. Employee (for awards granted beginning in October 2025) |
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| 2025-12-17 | 10-Q | 10.3 | 2019 Stock Incentive Plan Restricted Stock Unit Award Agreement - U.S. Employee (for awards granted beginning in October 2025) |
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| 2025-12-17 | 10-Q | 10.2 | Executive Employment Agreement effective January 1, 2026, between Ron Vachris and Costco Wholesale Corporation |
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| 2025-10-20 | 8-K | 10.1 | Fiscal 2026 Executive Bonus Plan |
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| 2025-03-13 | 10-Q | 10.2 | Citibank, N.A. Co-Branded Credit Card Agreement and amendments 1 through 13 |
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| 2024-12-19 | 10-Q | 10.3 | Thirteenth Amendment to Citi, N.A. Co-Branded Credit Card Agreement |
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| 2024-12-19 | 10-Q | 10.2 | Executive Employment Agreement effective January 1, 2025, between Ron Vachris and Costco Wholesale Corporation |
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| 2024-11-07 | 8-K | 10.1 | Fiscal 2025 Executive Bonus Plan |
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| 2023-12-20 | 10-Q | 10.2 | Executive Employment Agreement effective January 1, 2024, between Ron Vachris and Costco Wholesale Corporation |
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| 2023-10-11 | 10-K | 10.8 | Twelfth Amendment to Citi, N.A. Co-Branded Credit Card Agreement |
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| 2023-03-09 | 10-Q | 10.1 | Eleventh Amendment to Citi, N.A. Co-Branded Credit Card Agreement |
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| 2022-12-29 | 10-Q | 10.4 | Tenth Amendment to Citi, N.A. Co-Branded Credit Card Agreement |
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| 2022-12-29 | 10-Q | 10.3 | Ninth Amendment to Citi, N.A. Co-Branded Credit Card Agreement |
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| 2022-12-29 | 10-Q | 10.2 | Extension of the Term of the Executive Employment Agreement effective January 1, 2023, between W. Craig Jelinek and Costco Wholesale Corporation |
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| 2022-11-09 | 8-K | 10.1 | Fiscal 2023 Executive Bonus Plan |
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| 2022-03-10 | 10-Q | 10.1 | Eighth Amendment to Citi, N.A. Co-Branded Credit Card Agreement |
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| 2021-12-22 | 10-Q | 10.2 | Extension of the Term of the Executive Employment Agreement effective January 1, 2022, between W. Craig Jelinek and Costco Wholesale Corporation |
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| 2021-11-10 | 8-K | 10.1 | Fiscal 2021 Executive Bonus Plan |
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| 2021-03-10 | 10-Q | 10.1 | Seventh Amendment to Citi, N.A. Co-Branded Credit Card Agreement |
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| 2020-12-16 | 10-Q | 10.2 | Extension of the Term of the Executive Employment Agreement, effective January 1, 2021, between W. Craig Jelinek and Costco Wholesale Corporation |
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| 2020-10-15 | 8-K | 10.1 | Fiscal 2020 Executive Bonus Plan |
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| 2019-12-23 | 10-Q | 10.3.1 | Extension of the Term of the Executive Employment Agreement, effective January 1, 2020, between W. Craig Jelinek and Costco Wholesale Corporation |
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| 2019-12-23 | 10-Q | 10.2.4 | 2019 Stock Incentive Plan Letter Agreement for 2020 Performance-Based Restricted Stock Units-Executive |
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| 2019-12-23 | 10-Q | 10.2.3 | 2019 Stock Incentive Plan Restricted Stock Unit Award Agreement-Non-Executive Director |
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| 2019-12-23 | 10-Q | 10.2.2 | 2019 Stock Incentive Plan Restricted Stock Unit Award Agreement - Non-U.S. Employee |
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| 2019-12-23 | 10-Q | 10.2.1 | 2019 Stock Incentive Plan Restricted Stock Unit Award Agreement-Employee |
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| 2019-10-21 | 8-K | 10.1 | Fiscal 2020 Executive Bonus Plan |
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| 2019-10-11 | 10-K | 10.8.7 | Sixth Amendment to Citi, N.A. Co-Branded Credit Card Agreement |
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| 2019-03-13 | 10-Q | 10.2 | Fifth Amendment to Citi, N.A. Co-Branded Credit Card Agreement |
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| 2018-12-20 | 10-Q | 10.2 | Extension of the Term of the Executive Employment Agreement, effective January 1, 2019, between W. Craig Jelinek and Costco Wholesale Corporation |
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| 2018-10-26 | 8-K | 10.1 | Fiscal 2019 Executive Bonus Plan |
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| 2018-03-15 | 10-Q | 10.1 | Fourth Amendment to Citi, N.A. Co-Branded Credit Card Agreement |
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| 2017-12-21 | 10-Q | 10.2 | Letter dated December 18, 2017, Regarding an Extension of the Term of the Executive Employment Agreement, effective January 1, 2017, between W. Craig Jelinek and Costco Wholesale Corporation |
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| 2017-10-31 | 8-K | 10.1 | Fiscal 2018 Executive Bonus Plan |
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| 2016-12-16 | 10-Q | 10.1 | Executive Employment Agreement, effective January 1, 2017, between Craig Jelinek and Costco Wholesale Corporation |
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| 2016-11-03 | 8-K | 10.1 | Fiscal 2017 Executive Bonus Plan. |
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| 2016-10-12 | 10-K | 10.5.3 | Third Amendment to Citi, N.A. Co-Branded Credit Card Agreement |
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| 2016-10-12 | 10-K | 10.1.9 | Executive Employment Agreement, effective August 31, 2015, as amended, between Craig Jelinek and Costco Wholesale Corporation |
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| 2016-03-09 | 10-Q | 10.1 | Second Amendment to Citi, N.A. Co-Branded Credit Card Agreement |
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| 2015-12-18 | 10-Q | 10.2 | First Amendment to Citi, N.A. Co-Branded Credit Card Agreement |
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| 2015-12-18 | 10-Q | 10.1.14 | Seventh Restated 2002 Stock Incentive Plan Letter Agreement for 2016 Performance-Based Restricted Stock Units-Executive |
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| 2015-12-18 | 10-Q | 10.1.13 | Seventh Restated 2002 Stock Incentive Plan Restricted Stock Unit Award Agreement-Non-Executive Director |
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| 2015-12-18 | 10-Q | 10.1.12 | Seventh Restated 2002 Stock Incentive Plan Restricted Stock Unit Award Agreement-Non-U.S. Employee |
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| 2015-12-18 | 10-Q | 10.1.11 | Seventh Restated 2002 Stock Incentive Plan Restricted Stock Unit Award Agreement-U.S. Employee |
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| 2015-10-30 | 8-K | 10.1 | Fiscal 2016 Executive Bonus Plan. |
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| 2015-10-14 | 10-K | 10.1.15 | Executive Employment Agreement, effective August 31, 2015, between Craig Jelinek and Costco Wholesale Corporation |
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| 2015-08-31 | 10-Q/A | 10.1 | Citibank, N.A. Co-Branded Credit Card Agreement |
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| 2015-06-04 | 10-Q | 10.1 | Citibank, N.A. Co-Branded Credit Card Agreement |
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| 2014-12-18 | 10-Q | 10.1.10 | Sixth Restated 2002 Stock Incentive Plan Letter Agreement for 2015 Performance-Based Restricted Stock Units-Executive |
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| 2014-12-18 | 10-Q | 10.1.9 | Sixth Restated 2002 Stock Incentive Plan Restricted Stock Unit Award Agreement-Non-Executive Director |
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| 2014-12-18 | 10-Q | 10.1.8 | Sixth Restated 2002 Stock Incentive Plan Restricted Stock Unit Award Agreement-Employee |
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| 2014-11-28 | 8-K | 10.1 | Executive Employment Agreement, effective September 1, 2014, between Costco Wholesale Corporation and W. Craig Jelinek. |
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| 2014-10-29 | 8-K | 10.1 | Fiscal 2015 Executive Bonus Plan. |
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| 2014-10-15 | 10-K | 10.1.9 | Sixth Restated 2002 Stock Incentive Plan Restricted Stock Unit Award Agreement-Non-Executive Director |
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| 2014-10-15 | 10-K | 10.1.8 | Sixth Restated 2002 Stock Incentive Plan Restricted Stock Unit Award Agreement-Employee |
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| 2013-12-20 | 10-Q | 10.6.3 | EXECUTIVE EMPLOYMENT AGREEMENT |
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| 2013-10-30 | 8-K | 10.1 | Fiscal 2014 Executive Bonus Plan. |
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| 2013-10-16 | 10-K | 10.5 | Deferred Compensation Plan |
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| 2012-12-21 | 10-Q | 10.6.3 | EXECUTIVE EMPLOYMENT AGREEMENT |
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| 2012-11-01 | 8-K | 10.1 | FISCAL 2012 EXECUTIVE BONUS PLAN |
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| 2012-10-19 | 10-K | 10.5 | DEFERRED COMPENSATION PLAN |
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| 2012-10-19 | 10-K | 10.4 | STOCK PURCHASE AGREEMENT |
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| 2012-10-19 | 10-K | 10.1 | COSTCO WHOLESALE EXECUTIVE HEALTH PLAN |
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| 2011-12-16 | 10-Q | 10.6.3 | EXECUTIVE EMPLOYMENT AGREEMENT BETWEEN CRAIG JELINEK AND COSTCO WHOLESALE |
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| 2011-10-27 | 8-K | 10.1 | FISCAL 2012 EXECUTIVE BONUS PLAN |
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| 2011-10-14 | 10-K | 10.6.1 | EXECUTIVE EMPLOYMENT AGREEMENT BETWEEN JAMES D. SINEGAL AND COSTCO WHOLESALE |
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| 2011-10-14 | 10-K | 10.4.1 | AMENDMENT NO. 7 TO RESTATED CORPORATE JOINT VENTURE AGREEMENT |
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| 2010-11-15 | 8-K | 10.1 | FISCAL 2011 EXECUTIVE BONUS PLAN |
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| 2010-10-18 | 10-K | 10.6.1 | EXECUTIVE EMPLOYMENT AGREEMENT |
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| 2010-03-17 | 10-Q | 10.1.13 | FIFTH RESTATED 2002 STOCK INCENTIVE PLAN |
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| 2009-11-16 | 8-K | 10.1 | FISCAL 2010 EXECUTIVE BONUS PLAN |
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| 2009-10-16 | 10-K | 10.6.1 | EXECUTIVE EMPLOYMENT AGREEMENT |
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