| 2026-05-29 | 8-K | 10.1 | Stock Purchase Agreement, dated May 28, 2026, by and among Bora Holdings Group, L.P., Bora, Inc. and CoStar Realty Information, Inc. |
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| 2026-02-26 | 10-K | 10.20 | Summary of Non-Employee Director Compensation (filed herewith). |
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| 2026-02-26 | 10-K | 10.19 | CoStar Group, Inc. Amended and Restated CoStar Group, Inc. Management Stock Purchase Plan (filed herewith). |
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| 2026-02-26 | 10-K | 10.16 | CoStar Group Inc. 2026 Cash Incentive Plan (filed herewith). |
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| 2026-02-26 | 10-K | 10.5 | Form of CoStar Group Inc. 2025 Stock Incentive Plan Performance Stock Unit Grant Agreement between the Registrant and certain of its officers (filed herewith). |
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| 2026-02-13 | 8-K | 10.1 | CoStar Group, Inc. Amended Executive Severance Plan, dated as of February 13, 2026. |
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| 2026-01-07 | 8-K | 10.2 | CoStar Group, Inc. Executive Severance Plan dated January 6, 2026 |
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| 2026-01-07 | 8-K | 10.1 | Second Amendment, dated January 6, 2026, to the Employment Agreement between CoStar Realty Information, Inc. and Andrew C. Florance |
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| 2025-10-29 | 10-Q | 10.4 | Form of CoStar Group, Inc. 2025 Stock Incentive Plan Restricted Stock Grant Agreement for Service Awards between the Registrant and certain of its officers, directors and employees (filed herewith). |
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| 2025-10-29 | 10-Q | 10.3 | Form of CoStar Group, Inc. 2025 Stock Incentive Plan Restricted Stock Unit Grant Agreement between the Registrant and certain of its officers, directors and employees (filed herewith). |
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| 2025-10-29 | 10-Q | 10.2 | Form of CoStar Group, Inc. 2025 Stock Incentive Plan Restricted Stock Grant Agreement between the Registrant and certain of its officers, directors and employees (filed herewith). |
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| 2025-05-09 | 8-K | 10.1 | Scheme Implementation Deed, dated May 9, 2025, by and between CoStar Group, Inc., Domain Holdings Australia Limited and Andromeda Australia SubCo Pty Limited. |
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| 2025-04-07 | 8-K | 10.2 | Support Agreement, dated as of April 6, 2025, among the Company and Third Point parties thereto. |
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| 2025-04-07 | 8-K | 10.1 | Support Agreement, dated as of April 6, 2025, among the Company, D. E. Shaw & Co., L.P. and D. E. Shaw Oculus Portfolios, L.L.C. |
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| 2025-02-20 | 10-K | 10.22 | Canadian Addendum to CoStar Group ESPP (filed herewith). |
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| 2024-05-31 | 8-K | 10.1 | Credit Agreement, dated as of May 24, 2024, by and among CoStar Group, Inc., as borrower, the lenders party thereto and Bank of America, N.A., as administrative agent. |
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| 2024-02-22 | 10-K | 10.22 | Canadian Addendum to CoStar Group ESPP (filed herewith). |
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| 2023-07-26 | 10-Q | 10 | First Amendment to the Second Amended and Restated Credit Agreement, dated as of May 8, 2023, among CoStar Group, Inc., as borrower, CoStar Realty Information, Inc., as co-borrower, the lenders from time to time party thereto and Bank of America, N.A., as administrative agent (filed herewith). |
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| 2020-07-01 | 8-K | 10.1 | Second Amended and Restated Credit Agreement, dated as of July 1, 2020, by and among CoStar Group, Inc., as borrower, CoStar Realty Information, Inc., as co-borrower, the lenders party thereto and Bank of America, N.A., as administrative agent |
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| 2020-05-14 | 8-K | 10.1 | Agreement and Plan of Merger, dated as of May 13, 2020, by and among Ten-X Holding Company, Inc., CoStar Realty Information, Inc., Crescendo Sub, Inc., and Thomas H. Lee Equity Fund VII, L.P., solely in its capacity as representative thereunder |
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| 2020-02-13 | 8-K | 10.1 | Asset Purchase Agreement, dated as of the Petition Date (on or about February 12, 2020), among CSGP Holdings, LLC, CoStar Group, Inc. (solely for the specified purposes), RentPath Holdings, Inc. and the other Sellers named therein. |
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| 2019-10-02 | 8-K | 10.1 | Securities Purchase Agreement, dated as of September 30, 2019, among CoStar Group, Inc., CoStar Realty Information, Inc., CoStar Portfolio Strategy, LLC, STR, Inc., STR Global, Ltd., the seller parties thereto, and Randell Smith, in his capacity as Sellers’ Representative. |
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| 2018-04-25 | 10-Q | 10.1 | First Amendment to the CoStar Group, Inc. 2016 Stock Incentive Plan (filed herewith) |
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| 2018-02-23 | 10-K | 10.21 | MANAGEMENT STOCK PURCHASE PLAN |
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| 2017-10-25 | 8-K | 10.1 | WHEREAS, the Borrower has requested that certain modifications be made to the Existing Credit Agreement; and |
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| 2017-09-13 | 8-K | 10.1 | Securities Purchase Agreement, dated as of September 11, 2017, among CoStar Realty Information, Inc., CoStar Group, Inc., LTM Company Dominion, LLC, Dominion Enterprises, and Landmark Media Enterprises, LLC. |
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| 2016-07-28 | 10-Q | 10.9 | CEO NONQUALIFIED STOCK OPTION AGREEMENT |
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| 2016-07-28 | 10-Q | 10.8 | NONQUALIFIED STOCK OPTION AGREEMENT |
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| 2016-07-28 | 10-Q | 10.7 | CEO INCENTIVE STOCK OPTION AGREEMENT |
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| 2016-07-28 | 10-Q | 10.6 | INCENTIVE STOCK OPTION AGREEMENT |
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| 2016-07-28 | 10-Q | 10.5 | RESTRICTED STOCK UNIT AGREEMENT |
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| 2016-07-28 | 10-Q | 10.4 | 2016 STOCK INCENTIVE PLAN (EMPLOYEE SERVICE AWARDS) |
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| 2016-07-28 | 10-Q | 10.3 | 2016 STOCK INCENTIVE PLAN |
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| 2016-07-28 | 10-Q | 10.2 | 2016 CASH INCENTIVE PLAN |
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| 2015-06-05 | 8-K | 10.1 | AMENDMENT NO 1 TO CREDIT AGREEMENT |
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| 2015-04-29 | 8-K | 10.1 | Form of Voting Agreement, by and among CoStar Realty Information, Inc. and the funds |
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| 2014-04-04 | 8-K | 10.1 | CREDIT AGREEMENT |
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| 2014-03-03 | 8-K | 10.1 | ASSET PURCHASE AGREEMENT |
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| 2014-02-20 | 10-K | 10.22 | SEPARATION AGREEMENT |
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| 2014-02-20 | 10-K | 10.8 | FORM OF RESTRICTED STOCK UNIT AGREEMENT |
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| 2013-10-24 | 10-Q | 10.1 | SUMMARY OF NON-EMPLOYEE DIRECTOR COMPENSATION |
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| 2013-03-01 | 10-K | 10.19 | LEAVING AGREEMENT |
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| 2012-06-08 | 8-K | 10.1 | COSTAR 2007 STOCK INCENTIVE PLAN |
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| 2012-04-30 | 8-K | 10.2 | CREDIT AGREEMENT AMENDMENT |
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| 2012-04-27 | 10-Q | 10.1 | CREDIT AGREEMENT |
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| 2012-02-23 | 8-K | 10.1 | CREDIT AGREEMENT |
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| 2011-04-29 | 10-Q | 10.2 | PURCHASE AND SALE AGREEMENT |
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| 2011-04-29 | 10-Q | 10.1 | LEASE FOR 1331 L STREET |
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| 2011-04-28 | 8-K | 10.1 | VOTING AGREEMENT |
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| 2011-02-25 | 10-K | 10.14 | EMPLOYEE STOCK PURCHASE PLAN |
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| 2010-06-08 | 8-K | 10.1 | 2007 STOCK PLAN |
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| 2010-04-23 | 10-Q | 10.1 | PURCHASE AND SALE AGREEMENT |
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| 2010-02-26 | 10-K | 10.28 | LONDON SUB-UNDERLEASE |
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| 2010-02-26 | 10-K | 10.27 | BETHESDA OFFICE LEASE ADDENDUM |
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| 2010-02-26 | 10-K | 10.26 | LONDON ORIGINAL LEASE |
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| 2009-02-24 | 10-K | 10.16 | FIRST AMD TO FLORANCE EMP AGRMT |
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| 2009-02-24 | 10-K | 10.12 | 2007 NQSO GRANT AGR B/T REG & FLORANCE |
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| 2009-02-24 | 10-K | 10.11 | 2007 NQSO GRANT AGR B/T REG & DIRECTORS |
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| 2009-02-24 | 10-K | 10.10 | 2007 NQSO GRANT AGR B/T REG & OFF/EMP |
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| 2009-02-24 | 10-K | 10.9 | 2007 ISO GRANT AGR B/T REG & FLORANCE |
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| 2009-02-24 | 10-K | 10.8 | 2007 ISO GRANT AGR B/T REG & OFF/EMP |
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| 2009-02-24 | 10-K | 10.2 | 2007 STOCK PLAN AS AMENDED 12-08 |
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