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 |
|---|---|---|---|
| 10-Q | Quarterly report | Oct 28, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Material agreement, Results of operations, Regulation FD disclosure
|
Oct 27, 2026 | Oct 27, 2026 |
| 4 | Insider transaction | Oct 16, 2026 | Oct 15, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 21, 2026 | Aug 21, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 14, 2026 | — |
| 4 | Insider transaction | Aug 10, 2026 | Aug 7, 2026 |
| 4 | Insider transaction | Aug 10, 2026 | Aug 5, 2026 |
| 144 | Notice of proposed sale | Aug 5, 2026 | — |
| 4 | Insider transaction | Aug 5, 2026 | Aug 4, 2026 |
| 4 | Insider transaction | Aug 4, 2026 | Jul 31, 2026 |
| 4 | Insider transaction | Aug 4, 2026 | Jul 31, 2026 |
| 4 | Insider transaction | Aug 4, 2026 | Aug 1, 2026 |
| 3 | Initial insider ownership | Aug 4, 2026 | Jul 31, 2026 |
| S-8 | Employee stock plan registration | Jul 29, 2026 | — |
| 10-Q | Quarterly report | Jul 29, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Jul 28, 2026 | Jul 28, 2026 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Jul 13, 2026 | Jul 7, 2026 |
| 4 | Insider transaction | Jul 6, 2026 | Jul 1, 2026 |
| 8-K |
Current report
Officer or director change, Shareholder vote results, Regulation FD disclosure
|
Jun 25, 2026 | Jun 23, 2026 |
| 4 | Insider transaction | Jun 24, 2026 | Jun 23, 2026 |
| 4 | Insider transaction | Jun 24, 2026 | Jun 23, 2026 |
| 4 | Insider transaction | Jun 24, 2026 | Jun 23, 2026 |
| 4 | Insider transaction | Jun 24, 2026 | Jun 23, 2026 |
| 4 | Insider transaction | Jun 24, 2026 | Jun 23, 2026 |
| 4 | Insider transaction | Jun 24, 2026 | Jun 23, 2026 |
| 4 | Insider transaction | Jun 24, 2026 | Jun 23, 2026 |
| 4 | Insider transaction | Jun 16, 2026 | Jun 15, 2026 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
May 29, 2026 | May 28, 2026 |
| SD | Specialized disclosure (conflict minerals) | May 20, 2026 | — |
| DEFA14A | Additional proxy material | May 18, 2026 | — |
| 4 | Insider transaction | May 4, 2026 | May 1, 2026 |
| ARS | Annual report to shareholders | Apr 30, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 30, 2026 | — |
| DEF 14A | Proxy statement | Apr 30, 2026 | Jun 23, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 29, 2026 | — |
| 10-Q | Quarterly report | Apr 29, 2026 | Mar 31, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 29, 2026 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Apr 28, 2026 | Apr 28, 2026 |
| 3/A | Form 3/a | Apr 2, 2026 | Mar 25, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 26, 2026 | — |
| 4/A | Form 4/a | Mar 17, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| 3 | Initial insider ownership | Mar 17, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Mar 16, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 11, 2026 | Mar 10, 2026 |
| 4 | Insider transaction | Mar 11, 2026 | Mar 10, 2026 |
| 4 | Insider transaction | Mar 11, 2026 | Mar 10, 2026 |
| 4 | Insider transaction | Mar 11, 2026 | Mar 10, 2026 |
| 4 | Insider transaction | Mar 11, 2026 | Mar 10, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 6, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Mar 2, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Mar 1, 2026 |
| 4 | Insider transaction | Mar 2, 2026 | Feb 27, 2026 |
| 10-K | Annual report | Feb 26, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 24, 2026 | Feb 24, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 15, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 15, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 15, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 15, 2026 |
| 8-K |
Current report
Officer or director change
|
Feb 13, 2026 | Feb 13, 2026 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Jan 7, 2026 | Jan 7, 2026 |
| 4 | Insider transaction | Nov 17, 2025 | Nov 13, 2025 |
| 4 | Insider transaction | Nov 17, 2025 | Nov 13, 2025 |
| 144 | Notice of proposed sale | Nov 13, 2025 | — |
| 10-Q | Quarterly report | Oct 29, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Oct 28, 2025 | Oct 28, 2025 |
| 4 | Insider transaction | Sep 11, 2025 | Sep 9, 2025 |
| 4 | Insider transaction | Sep 11, 2025 | Sep 9, 2025 |
| 4 | Insider transaction | Sep 11, 2025 | Sep 9, 2025 |
| 4 | Insider transaction | Sep 11, 2025 | Sep 9, 2025 |
| 4 | Insider transaction | Sep 11, 2025 | Sep 9, 2025 |
| 4 | Insider transaction | Sep 11, 2025 | Sep 9, 2025 |
| 4 | Insider transaction | Sep 11, 2025 | Sep 9, 2025 |
| 4 | Insider transaction | Sep 2, 2025 | Aug 28, 2025 |
| 144 | Notice of proposed sale | Aug 28, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 27, 2025 | Aug 27, 2025 |
| 4 | Insider transaction | Aug 5, 2025 | Aug 1, 2025 |
| 4 | Insider transaction | Aug 5, 2025 | Aug 1, 2025 |
| 4 | Insider transaction | Jul 29, 2025 | Jul 28, 2025 |
| 4 | Insider transaction | Jul 29, 2025 | Jul 28, 2025 |
| 144 | Notice of proposed sale | Jul 28, 2025 | — |
| S-8 | Employee stock plan registration | Jul 23, 2025 | — |
| 10-Q | Quarterly report | Jul 23, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 22, 2025 | Jul 22, 2025 |
| 4 | Insider transaction | Jul 2, 2025 | Jul 1, 2025 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jun 27, 2025 | Jun 26, 2025 |
| 4 | Insider transaction | Jun 17, 2025 | Jun 15, 2025 |
| DEFA14A | Additional proxy material | Jun 13, 2025 | — |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 144 | Notice of proposed sale | Jun 11, 2025 | — |
| 4 | Insider transaction | Jun 3, 2025 | Jun 1, 2025 |
| 144 | Notice of proposed sale | May 12, 2025 | — |
| 144 | Notice of proposed sale | May 9, 2025 | — |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
May 9, 2025 | May 9, 2025 |
| DEFA14A | Additional proxy material | May 1, 2025 | — |
| 10-Q | Quarterly report | May 1, 2025 | Mar 31, 2025 |
| ARS | Annual report to shareholders | Apr 30, 2025 | Dec 31, 2024 |
| DEF 14A | Proxy statement | Apr 30, 2025 | Jun 26, 2025 |
| 8-K |
Current report
Results of operations
|
Apr 29, 2025 | Apr 29, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 23, 2025 | — |
| 3 | Initial insider ownership | Apr 14, 2025 | Apr 6, 2025 |
| 3 | Initial insider ownership | Apr 14, 2025 | Apr 6, 2025 |
| 3 | Initial insider ownership | Apr 14, 2025 | Apr 6, 2025 |
| 8-K |
Current report
Material agreement, Officer or director change, Regulation FD disclosure
|
Apr 7, 2025 | Apr 6, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 15, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 15, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 15, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 15, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 15, 2025 |
| 4 | Insider transaction | Mar 14, 2025 | Jul 31, 2024 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Mar 1, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Mar 1, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Mar 1, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Mar 1, 2025 |
| S-8 | Employee stock plan registration | Feb 28, 2025 | — |
| 8-K |
Current report
Acquisition or sale of assets, Regulation FD disclosure
|
Feb 28, 2025 | Feb 28, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 13, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 13, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 13, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 13, 2025 |
| 10-K | Annual report | Feb 20, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Feb 19, 2025 | Feb 15, 2025 |
| 4 | Insider transaction | Feb 19, 2025 | Feb 15, 2025 |
| 4 | Insider transaction | Feb 19, 2025 | Feb 15, 2025 |
| 4 | Insider transaction | Feb 19, 2025 | Feb 15, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 18, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Dec 12, 2024 | Dec 10, 2024 |
| 4 | Insider transaction | Dec 12, 2024 | Dec 10, 2024 |
| 144 | Notice of proposed sale | Dec 10, 2024 | — |
| 4 | Insider transaction | Dec 2, 2024 | Nov 27, 2024 |
| 4 | Insider transaction | Nov 27, 2024 | Nov 26, 2024 |
| 144 | Notice of proposed sale | Nov 27, 2024 | — |
| 144 | Notice of proposed sale | Nov 26, 2024 | — |
| 4 | Insider transaction | Oct 28, 2024 | Oct 25, 2024 |
| 4 | Insider transaction | Oct 28, 2024 | Oct 25, 2024 |
| 144 | Notice of proposed sale | Oct 25, 2024 | — |
| 10-Q | Quarterly report | Oct 23, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Oct 22, 2024 | Oct 22, 2024 |
| 4 | Insider transaction | Aug 5, 2024 | Jul 17, 2024 |
| 4 | Insider transaction | Aug 5, 2024 | Jul 17, 2024 |
| 4 | Insider transaction | Aug 5, 2024 | Jul 17, 2024 |
| 4 | Insider transaction | Aug 5, 2024 | Jul 17, 2024 |
| 4 | Insider transaction | Aug 5, 2024 | Jul 17, 2024 |
| 4 | Insider transaction | Aug 5, 2024 | Jul 17, 2024 |
| 4/A | Form 4/a | Aug 5, 2024 | Jul 1, 2024 |
| 4 | Insider transaction | Aug 5, 2024 | Jul 17, 2024 |
| 4 | Insider transaction | Aug 1, 2024 | Jul 30, 2024 |
| 4 | Insider transaction | Jul 30, 2024 | Jul 26, 2024 |
| 4 | Insider transaction | Jul 30, 2024 | Jul 26, 2024 |
| 4 | Insider transaction | Jul 30, 2024 | Jul 27, 2024 |
| 144 | Notice of proposed sale | Jul 30, 2024 | — |
| 10-Q | Quarterly report | Jul 25, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 23, 2024 | Jul 23, 2024 |
| 3 | Initial insider ownership | Jul 18, 2024 | Jul 8, 2024 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Jul 11, 2024 | Jul 8, 2024 |
| 4 | Insider transaction | Jul 3, 2024 | Jul 1, 2024 |
| 3 | Initial insider ownership | Jul 3, 2024 | Jul 1, 2024 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Jun 18, 2024 | Jun 18, 2024 |
| EFFECT | Filing | Jun 10, 2024 | — |
| 424B3 | Prospectus | Jun 10, 2024 | — |
| S-4/A | Filing | Jun 10, 2024 | — |
| CORRESP | Letter to the SEC | Jun 7, 2024 | — |
| 8-K |
Current report
Shareholder vote results
|
Jun 7, 2024 | Jun 6, 2024 |
| 4 | Insider transaction | Jun 4, 2024 | Jun 1, 2024 |
| 8-K |
Current report
Material agreement, New debt
|
May 31, 2024 | May 24, 2024 |
| UPLOAD | Letter from the SEC | May 30, 2024 | — |
| S-4 | Registration for a merger or exchange | May 21, 2024 | — |
| 4 | Insider transaction | May 17, 2024 | May 16, 2024 |
| 144 | Notice of proposed sale | May 16, 2024 | — |
| 4 | Insider transaction | May 10, 2024 | May 9, 2024 |
| 144 | Notice of proposed sale | May 9, 2024 | — |
| 4 | Insider transaction | May 9, 2024 | May 7, 2024 |
| 4 | Insider transaction | Apr 30, 2024 | Apr 26, 2024 |
| 4 | Insider transaction | Apr 30, 2024 | Apr 26, 2024 |
| 144 | Notice of proposed sale | Apr 26, 2024 | — |
| 144 | Notice of proposed sale | Apr 26, 2024 | — |
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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.