CoStar Group filings document the regulatory record of a Delaware operating company that provides online real estate marketplaces, information, analytics, and 3D digital twin technology. Its 8-K reports commonly furnish quarterly and annual operating results, Regulation FD disclosures, investor presentation channels, and material corporate events tied to its property-market data and marketplace business.
Proxy and governance filings cover annual meeting matters, board composition, executive compensation arrangements, severance plans, and related employment agreements. Recent filings also document completed acquisition activity, capital actions, and formal disclosures connected to CoStar Group’s corporate structure and public-company governance.
Christine M. McCarthy, a director of CoStar Group, Inc. (CSGP), reported a purchase of 2,973 shares of the company's common stock on 09/09/2025 at a reported price of $0, resulting in direct beneficial ownership of 2,973 shares following the transaction. The Form 4 was signed by an attorney-in-fact on 09/11/2025. The filing documents an insider acquisition by a board member but does not disclose reason or additional holdings.
Insider purchase disclosed: Director Louise S. Sams acquired 3,291 shares of CoStar Group, Inc. (CSGP) on 09/09/2025 at no reported cash price and now beneficially owns 19,409 shares. The Form 4 was signed by an attorney-in-fact on 09/11/2025. The filing indicates the transaction was by the reporting person as a director and was filed individually.
CoStar Group, Inc. (CSGP) director John L. Berisford reported acquiring 2,973 shares of CoStar common stock on 09/09/2025. The transaction is coded "A" and shows a price of $0 per share, with 2,973 shares reported as beneficially owned following the transaction. The Form 4 was filed as a single reporting person filing and includes an electronic signature executed by Gene Boxer, Attorney-in-Fact, dated 09/11/2025. The reporting address is listed as C/O CoStar Group, Inc., 1201 Wilson Blvd., Arlington, VA 22209. No derivative securities or additional transactions are reported on this Form 4.
John W. Hill, a director of CoStar Group, Inc. (CSGP), reported acquiring 3,177 shares of the company's common stock on 09/09/2025. The reported transaction shows a price of $0 and brings his beneficial ownership to 20,481 shares following the transaction. The Form 4 was signed by Gene Boxer, Attorney-in-Fact, on 09/11/2025. The filing identifies Hill as a director and is a single-reporting-person Form 4. No derivative securities or other transactions are disclosed in this filing.
Robert W. Musslewhite, a director of CoStar Group, Inc. (CSGP), acquired 3,121 shares of CoStar common stock on 09/09/2025. The Form 4 reports the transaction as an acquisition (transaction code A) at a reported price of $0, and shows total beneficial ownership following the transaction of 18,277 shares. The filing indicates the report was submitted by one reporting person and is signed by an attorney-in-fact on 09/11/2025.
The filing shows that Rachel C. Glaser, a director of CoStar Group, Inc. (CSGP), acquired 3,143 shares of CoStar common stock on 09/09/2025 at a reported price of $0 (indicating a non‑cash award or gift reporting convention). After the transaction she beneficially owned 3,143 shares directly. The Form 4 was signed by an attorney‑in‑fact on 09/11/2025.
Angelique G. Brunner, a director of CoStar Group, Inc. (CSGP), acquired 3,143 shares of the company’s common stock on 09/09/2025 at no reported cash price, bringing her total beneficial ownership to 10,166 shares held directly. The Form 4 discloses this non-derivative purchase and indicates the filing was executed by an attorney-in-fact on behalf of the reporting person.
The filing shows a single, straightforward purchase of common stock by an insider rather than a sale or derivative transaction; no option grants, conversions, or other derivative activity are reported.
Saint Frederick G., identified as President, Marketplaces of CoStar Group, Inc. (CSGP), reported a sale of 25,000 shares of CoStar common stock on 08/28/2025 at an average price of $90.33 per share (sale prices ranged $90.30–$90.38). Following the transaction the reporting person beneficially owned 293,103 shares, held directly. The Form 4 was signed by attorney-in-fact Gene Boxer on 09/02/2025. The filing shows routine insider disposition with the required Section 16 disclosure and includes an explanatory remark on the average sale price.
CoStar Group Inc (CSGP) Form 144 summary: This Form 144 notifies a proposed sale of 25,000 shares of CoStar common stock through Morgan Stanley Smith Barney, scheduled approximately 08/28/2025, with an aggregate market value listed as $2,258,225.00 and total outstanding shares of 423,650,362.
The filing identifies the seller as Frederick Saint and discloses prior sales by the same person of 25,000 shares on 07/28/2025 for $2,330,827.51 and 25,000 shares on 06/11/2025 for $2,027,382.51. Acquisition details show the shares being sold were originally received as restricted stock on multiple dates in 2021 and 2022.
CoStar Group, Inc. filed a report describing the completion of its acquisition of 100% of the issued capital of Domain Holdings Australia Limited. On August 27, 2025, the company acquired the remaining approximately 83% of Domain’s ordinary shares it did not already own under a previously disclosed Scheme Implementation Deed. The shares were acquired by way of a Scheme of Arrangement at $4.43 AUD per Domain share, reduced by $0.088 AUD per share reflecting a special dividend declared by Domain and paid on August 19, 2025. The company furnished a press release with additional details as an exhibit.