and the Press Release shall be considered “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, nor shall it be deemed incorporated by reference into any reports or filings with the Securities and Exchange Commission (the "SEC"), whether made before or after the date hereof, except as expressly set f…

Chief Financial Officer — Robin Rossmann: Robin Rossmann was promoted to Chief Financial Officer from Managing Director, Europe.

Approval of a new employee stock purchase plan.

Entry into a Material Definitive Agreement. On May 28, 2026, CoStar Group, Inc. (“CoStar Group” or the “Company”), through its wholly owned subsidiary, CoStar Realty Information, Inc., a Delaware corporation, entered into a Stock Purchase Agreement (the “Purchase Agreement”) with Bora Holdings Group, L.P., a Delaware limited partnership (the “Seller”), and Bora, Inc., a Delaware corporation (together with its subsidiaries, “Zonda”), to acquire Zonda, a leading provider of new home constructio…

and the Press Release shall be considered “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, nor shall it be deemed incorporated by reference into any reports or filings with the Securities and Exchange Commission (the "SEC"), whether made before or after the date hereof, except as expressly set f…

Director — Nana Banerjee: Appointment of a new director to the Board.

and the Press Release shall be considered “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, nor shall it be deemed incorporated by reference into any reports or filings with the Securities and Exchange Commission (the "SEC"), whether made before or after the date hereof, except as expressly set f…

The company amended its Executive Severance Plan to remove a clause related to the composition of the Board of Directors.

Regulation FD Disclosure. On January 7, 2026, the Company issued a press release (the “Press Release”) providing the Company’s full year 2026 financial outlook and medium-term targets as well as long-term financial targets for its net investment in Homes.com. The Press Release also announced a new $1.5 billion share repurchase program and a new executive compensation program responding to stockholder feedback. A copy of the Press Release is attached hereto as Exhibit 99.1 and is incorporated…

CEO — Andrew C. Florance: The filing discloses an amendment to the CEO's employment agreement and the adoption of a severance plan, which are compensatory arrangements rather than a change in personnel or management departure.

and the Press Release shall be considered “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, nor shall it be deemed incorporated by reference into any reports or filings with the Securities and Exchange Commission (the "SEC"), whether made before or after the date hereof, except as expressly set f…

Regulation FD Disclosure . On August 27, 2025, CoStar Group, Inc., a Delaware corporation (“CoStar Group” or the “Company”), issued a press release (the “Press Release”) announcing the completion of its acquisition of 100% of the issued capital of Domain Holdings Australia Limited (“Domain”). Pursuant to the binding Scheme Implementation Deed previously disclosed and entered into on May 9, 2025, the Company acquired the remaining approximately 83% of Domain's ordinary shares not previously ac…

and the Press Release shall be considered “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, nor shall it be deemed incorporated by reference into any reports or filings with the Securities and Exchange Commission (the "SEC"), whether made before or after the date hereof, except as expressly set f…

The filing discloses the approval of a new stock incentive plan, which is a compensatory arrangement rather than a change in management personnel.

and the Press Release shall be considered “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, nor shall it be deemed incorporated by reference into any reports or filings with the Securities and Exchange Commission (the “SEC”), whether made before or after the date hereof, except as expressly set f…

Entry into a Material Definitive Agreement. On May 9, 2025, CoStar Group, Inc. (“CoStar Group” or the “Company”) entered into a binding Scheme Implementation Deed (the “SID”) with Domain Holdings Australia Limited (ASX:DHG) (“Domain”) to acquire 100% of the issued capital of Domain not previously acquired by CoStar Group by way of Scheme of Arrangement (the “Domain Transaction”). Pursuant to the SID, Domain shareholders will be entitled to receive total cash consideration of $4.43 AUD per Dom…

and the Press Release shall be considered “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, nor shall it be deemed incorporated by reference into any reports or filings with the Securities and Exchange Commission, whether made before or after the date hereof, except as expressly set forth by spec…

and the Press Release shall be considered “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, nor shall it be deemed incorporated by reference into any reports or filings with the SEC, whether made before or after the date hereof, except as expressly set forth by specific reference in such a filing. Forward-Looking Statements Th…

Entry into a Material Definitive Agreement. Support Agreements On April 6, 2025, CoStar Group, Inc. (the “Company”) entered into (i) a Support Agreement (the “D. E. Shaw Support Agreement”) with D. E. Shaw & Co., L.P. and D. E. Shaw Oculus Portfolios, L.L.C. (collectively, “D. E. Shaw”) and (ii) a Support Agreement (the “Third Point Support Agreement” and together with the D. E. Shaw Support Agreement, the “Support Agreements”) with Third Point LLC and certain of its affiliates (collectively,…

Director — Michael R. Klein: The filing describes a routine board refreshment where three directors resigned to be replaced by three new independent appointees, with no indication of disagreement or executive officer departure.

Completion of Acquisition or Disposition of Assets. Merger Agreement On February 28, 2025, CoStar Group, Inc., a Delaware corporation (“CoStar Group”), completed the previously announced acquisition contemplated by the Agreement and Plan of Merger and Reorganization, dated as of April 21, 2024 (the “Merger Agreement”), by and among CoStar Group, Matterport, Inc., a Delaware corporation (“Matterport”), Matrix Merger Sub, Inc., a Delaware corporation and a wholly-owned subsidiary of CoStar Grou…

and the Press Release shall be considered “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended (the “Securities Act”), nor shall it be deemed incorporated by reference into any reports or filings with the Securities and Exchange Commission (the “SEC”), whether made before or afte…

and the Press Release shall be considered “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended (the "Securities Act"), nor shall it be deemed incorporated by reference into any reports or filings with the Securities and Exchange Commission (the "SEC"), whether made before or afte…

and the Press Release shall be considered “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, nor shall it be deemed incorporated by reference into any reports or filings with the Securities and Exchange Commission, whether made before or after the date hereof, except as expressly set forth by spec…

Chief Accounting Officer — Cynthia Eakin: The filing discloses the internal promotion of a long-tenured employee to the role of Chief Accounting Officer, which is a standard succession or role expansion event rather than a departure.