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Costar Group, Inc. SEC filings

In the twelve months since 23 September 2025 Costar Group, Inc. filed 21 documents with the SEC of the kinds listed here: 11 current reports (8-K), about 9 regulation fd disclosure; 5 officer or director change; 4 results of operations; 1 shareholder vote; 1 material agreement; 3 quarterly reports (10-Q), 2 additional proxy materials (DEFA14A), 1 employee share plan registration (S-8), 1 conflict minerals report (SD), 1 annual report to shareholders (ARS), 1 proxy statement (DEF 14A). The latest, filed 21 August 2026: 8-K, regulation fd disclosure.

FiledFormWhat it was aboutPeriod or event dateFiling
21 August 20268-KRegulation FD disclosure21 August 2026EDGAR
29 July 2026S-8employee share plan registrationEDGAR
29 July 202610-Qquarterly report30 June 2026EDGAR
28 July 20268-KResults of operations28 July 2026EDGAR
13 July 20268-KOfficer or director change, Regulation FD disclosure7 July 2026EDGAR
25 June 20268-KOfficer or director change, Shareholder vote, Regulation FD disclosure23 June 2026EDGAR
29 May 20268-KMaterial agreement, Regulation FD disclosure28 May 2026EDGAR
20 May 2026SDconflict minerals reportEDGAR
18 May 2026DEFA14Aadditional proxy materialEDGAR
30 April 2026ARSannual report to shareholders31 December 2025EDGAR
30 April 2026DEFA14Aadditional proxy materialEDGAR
30 April 2026DEF 14Aproxy statement23 June 2026EDGAR
29 April 202610-Qquarterly report31 March 2026EDGAR
28 April 20268-KResults of operations, Regulation FD disclosure28 April 2026EDGAR
16 March 20268-KOfficer or director change, Regulation FD disclosure15 March 2026EDGAR
26 February 202610-Kannual report31 December 2025EDGAR
24 February 20268-KResults of operations, Regulation FD disclosure24 February 2026EDGAR
13 February 20268-KOfficer or director change13 February 2026EDGAR
7 January 20268-KOfficer or director change, Regulation FD disclosure7 January 2026EDGAR
29 October 202510-Qquarterly report30 September 2025EDGAR
28 October 20258-KResults of operations, Regulation FD disclosure28 October 2025EDGAR

An 8-K is what a company files within four business days of a material event; the SEC numbers the events, and the words here are the SEC's own headings, shortened. Form 4, Form 144, 13F and Schedule 13D and 13G have their own pages. Prospectus supplements and correspondence are not listed.

Source

The company's filing index on EDGAR, read from the SEC's submissions feed.

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