Costar Group, Inc. SEC filings CSGP
Costar Group, Inc. has 1,000 filings in SEC EDGAR's recent list, going back to Jun 7, 2011. Its latest annual report, Form ARS, was filed on Apr 30, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Oct 28, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Oct 27, 2026 (material agreement, results of operations, regulation fd disclosure). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| DEFA14A | Additional proxy material | May 18, 2026 | — |
| DEFA14A | Additional proxy material | Apr 30, 2026 | — |
| DEF 14A | Proxy statement | Apr 30, 2026 | Jun 23, 2026 |
| DEFA14A | Additional proxy material | Jun 13, 2025 | — |
| DEFA14A | Additional proxy material | May 1, 2025 | — |
| DEF 14A | Proxy statement | Apr 30, 2025 | Jun 26, 2025 |
| DEFA14A | Additional proxy material | Apr 26, 2024 | — |
| DEF 14A | Proxy statement | Apr 26, 2024 | Jun 6, 2024 |
| DEFA14A | Additional proxy material | Apr 27, 2023 | — |
| DEF 14A | Proxy statement | Apr 27, 2023 | — |
| DEFA14A | Additional proxy material | Apr 25, 2022 | — |
| DEF 14A | Proxy statement | Apr 25, 2022 | Jun 9, 2022 |
| DEFA14A | Additional proxy material | Apr 26, 2021 | — |
| DEFA14A | Additional proxy material | Apr 19, 2021 | — |
| DEF 14A | Proxy statement | Apr 19, 2021 | Jun 2, 2021 |
| PRE 14A | Preliminary proxy statement | Apr 5, 2021 | Jun 2, 2021 |
| DEFA14A | Additional proxy material | Apr 24, 2020 | — |
| DEF 14A | Proxy statement | Apr 24, 2020 | Jun 3, 2020 |
| DEFA14A | Additional proxy material | Apr 24, 2019 | — |
| DEF 14A | Proxy statement | Apr 24, 2019 | Jun 5, 2019 |
| DEFA14A | Additional proxy material | Apr 24, 2018 | — |
| DEF 14A | Proxy statement | Apr 24, 2018 | Jun 6, 2018 |
| DEFA14A | Additional proxy material | Apr 24, 2017 | — |
| DEF 14A | Proxy statement | Apr 24, 2017 | Jun 6, 2017 |
| DEFA14A | Additional proxy material | Apr 26, 2016 | — |
| DEF 14A | Proxy statement | Apr 26, 2016 | Jun 9, 2016 |
| DEFA14A | Additional proxy material | Apr 20, 2015 | — |
| DEF 14A | Proxy statement | Apr 20, 2015 | Jun 3, 2015 |
| DEFA14A | Additional proxy material | Apr 11, 2014 | — |
| DEF 14A | Proxy statement | Apr 11, 2014 | Jun 2, 2014 |
| DEFA14A | Additional proxy material | Apr 25, 2013 | — |
| DEF 14A | Proxy statement | Apr 25, 2013 | Jun 4, 2013 |
| PRE 14A | Preliminary proxy statement | Apr 12, 2013 | Jun 4, 2013 |
| DEFA14A | Additional proxy material | Apr 25, 2012 | — |
| DEF 14A | Proxy statement | Apr 25, 2012 | Jun 5, 2012 |
| PRE 14A | Preliminary proxy statement | Apr 11, 2012 | Jun 5, 2012 |
Showing 36 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
Company profile
- Industry
- Services-Business Services, NEC (SIC 7389)
- Listed as
- CSGP (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Arlington, VA
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1057352
- Former names
- COSTAR GROUP, INC. (until Oct 28, 2026); COSTAR GROUP INC (until Jun 25, 2019); REALTY INFORMATION GROUP INC (until May 5, 1999)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.