# CoStar Group

> American technology company

**Wikidata**: [Q16988748](https://www.wikidata.org/wiki/Q16988748)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/CoStar_Group)  
**Source**: https://4ort.xyz/entity/costar-group

## Summary

CoStar Group is a business [1][2] founded in 1987 [3][4] with its headquarters in Washington, D.C. [1][5][3][6][7] Organized as a Delaware corporation [2], it operates in the information technology sector, specializing in services for the real estate industry, including residential and commercial property [6][3][8][4].The company provides data, analytics, and market information for real estate professionals, covering both residential and commercial property segments [6][3][8][4]. CoStar Group’s legal structure as a Delaware corporation [2] supports its operations across these industries. Its founding in 1987 [3][4] established its presence in the U.S. market.

## Summary
CoStar Group is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Founded in 1987 by Andy Florance, it is a publicly traded Delaware corporation listed on Nasdaq (CSGP) and is a member of the S&P 500.

## Key Facts
- Founded/inception: 1987; founded by Andy Florance.  
- CEO: Andy Florance (CEO since 1987).  
- Legal form: Delaware corporation (effective 1998-02-02).  
- Public company / stock: Listed on Nasdaq under ticker CSGP (public since 1998-07-01); ISIN US22160N1090.  
- S&P 500: Included in the S&P 500 index starting 2022-09-19.  
- Headquarters: Washington, D.C. (1331 L St NW; latitude 38.903875650814435, longitude -77.03104444605682) through 2025-01-31; Arlington County (1201 Wilson Blvd, Arlington, VA) starting 2025-02-01.  
- Major subsidiaries / operated marketplaces: LoopNet (acquired 2012), STR, Inc. (acquired 2019-10-22), Apartments.com, Homes.com, OnTheMarket, Domain Group.  
- Official website: https://www.costargroup.com/ (English).  
- Corporate identifiers: Central Index Key (CIK) 0001057352; EIN 52-2091509; CAGE code 1PMX8; D-U-N-S 188908909; ROR ID 04yp7fr64.  
- Trustpilot review score: 2.9 / 5 (point in time: 2022-09-17).

## FAQs
### Q: What does CoStar Group do?
A: CoStar Group provides commercial and residential real estate information, analytics, and online marketplaces. It operates multiple property marketplaces and data/analytics products for the real estate industry.

### Q: Who founded CoStar Group and who is the CEO?
A: CoStar Group was founded by Andy Florance in 1987. Andy Florance is listed as the company's CEO, with a start time of 1987.

### Q: Is CoStar Group a public company and where is it listed?
A: Yes. CoStar Group is a publicly traded Delaware corporation listed on the Nasdaq under the ticker CSGP (public since 1998-07-01) and was added to the S&P 500 on 2022-09-19.

### Q: What are CoStar Group’s major marketplaces or subsidiaries?
A: Major subsidiaries and marketplaces include LoopNet, Apartments.com, Homes.com, OnTheMarket, Domain Group, and STR, Inc.

### Q: Where are CoStar Group’s headquarters located?
A: The company’s headquarters were in Washington, D.C. (1331 L St NW) through 2025-01-31; the headquarters are listed as Arlington County (1201 Wilson Blvd, Arlington, VA) starting 2025-02-01.

## Why It Matters
CoStar Group aggregates property data, analytics, and online listing marketplaces for commercial and residential real estate, combining information services with transaction-oriented platforms. By operating major marketplaces (for example, Apartments.com and LoopNet) alongside analytics and data products, CoStar serves multiple parts of the real estate ecosystem — brokers, landlords, investors, and researchers — with centralized data and distribution channels. Its acquisitions of established property platforms (LoopNet in 2012 and STR, Inc. in 2019) expanded its dataset and market reach. Inclusion in the S&P 500 in 2022 marked its scale and presence in public markets. For users and businesses that depend on timely property listings, historical records, benchmarking, and market intelligence, CoStar functions as a consolidated supplier of data and marketplaces that reduce friction between information and transaction activity in the real estate sector.

## Notable For
- Inclusion in the S&P 500 index on 2022-09-19, signalling its scale among U.S. public companies.  
- Acquisitions that expanded its marketplace and data footprint, notably LoopNet (completed 2012) and STR, Inc. (completed 2019-10-22).  
- Founder-led leadership: Andy Florance is both founder and long-serving CEO (since 1987).  
- Wide portfolio of property marketplaces and information products, including Apartments.com, Homes.com, OnTheMarket, and Domain Group.  
- Dual classification in industry data: listed under both information technology and real estate industry categories.

## Body
### Corporate identity and legal structure
- Official name: CoStar Group, Inc.  
- Instance: Business; public company (public since 1998-07-01).  
- Legal form: Delaware corporation (start time 1998-02-02).  
- Founded/inception: 1987.  
- Founder: Andy Florance.  
- CEO: Andy Florance (start_time: 1987).  
- Owned_by: Andy Florance (listed in properties).  
- Employer Identification Number (EIN): 52-2091509.

### Market listing and identifiers
- Stock exchange: Nasdaq, ticker CSGP (start_time: 1998-07-01).  
- ISIN: US22160N1090.  
- Central Index Key (CIK): 0001057352.  
- PermID: 4295912984.  
- ROR ID: 04yp7fr64.  
- Bloomberg company ID: CSGP:US.  
- D-U-N-S number: 188908909.  
- CAGE code: 1PMX8.  
- Additional IDs: VIAF 128185348; Library of Congress authority no2003039882; KISTI K000230215; Golden IDs listed; Crunchbase organization id costar-group.

### Headquarters and offices
- Washington, D.C. headquarters: 1331 L St NW, Washington, DC 20005; coordinates lat 38.903875650814435, lon -77.03104444605682; listed with end_time 2025-01-31.  
- Arlington County headquarters: 1201 Wilson Blvd, Arlington, VA 22209; listed with start_time 2025-02-01.

### Industry and offerings
- Industry classifications: Information technology; real estate industry (commercial property, residential property).  
- Core offerings described: Real estate information, analytics, and online marketplaces.  
- Official website: https://www.costargroup.com/ (English).  
- Official jobs/careers URL: https://costar.wd1.myworkdayjobs.com/CoStarCareers.

### Subsidiaries and major assets
- LoopNet — listed as a subsidiary (business) with start_time 2012-04 (acquisition completed April 2012).  
- STR, Inc. — listed as a subsidiary with start_time 2019-10-22 (acquisition completed October 2019).  
- Apartments.com — owned/operated by CoStar Group; online rental marketplace in the United States.  
- Additional subsidiaries or operated sites: Homes.com, OnTheMarket, Domain Group.

### Public perception and social presence
- Trustpilot review score: 2.9 / 5 (point in time: 2022-09-17).  
- Twitter handles: primary preferred handle CoStarGroup (point_in_time: 2022-09-16); historical and regional handles include TheCoStarGroup, CoStarCanada, CoStarUS.  
- Facebook: CoStarGroup (start_time: 2010-03-09).  
- Instagram: costarcareers.  
- YouTube: channel id UCiR5npw9N4wBKCYaA5UWzIw (start_time: 2007-11-01); handle costargroup.  
- Social media followers: 46,500 (point in time: 2024-07-15).

### Notable dates and milestones
- 1987: Company founded and Andy Florance begins as CEO.  
- 1998-02-02: Converted / registered as a Delaware corporation.  
- 1998-07-01: Public company listing on Nasdaq (CSGP).  
- April 2012: Completion of LoopNet acquisition.  
- 2019-10-22: Completion of STR, Inc. acquisition.  
- 2022-09-12 / 2022-09-19: Announcement and inclusion in the S&P 500 index.

### External references and resources
- Official site and contact pages listed on company properties.  
- Public filings and identifiers (CIK 0001057352, ISIN US22160N1090) for market and regulatory lookup.  
- Public news references tied to acquisitions and index inclusion as cited in company and news sources (e.g., LoopNet deal coverage, S&P 500 inclusion announcement).

(End of entry.)

## References

1. EDGAR
2. Crunchbase
3. Thomson Reuters Open Perm ID
4. OpenCorporates
5. Google Maps
6. [Source](https://www.dnb.com/de-de/upik-profile-en/188908909/costar_group__inc_)
7. Virtual International Authority File
8. Library of Congress Name Authority File
9. [CoStar Group completes LoopNet deal. Washington Business Journal. 2012](https://www.bizjournals.com/washington/news/2012/04/30/costar-completes-loopnet-deal.html)
10. [Source](https://cage.dla.mil/Search/Details?id=435929)
11. [CoStar Group Completes STR Acquisition. 2019](https://lodgingmagazine.com/costar-group-completes-str-acquisition/)
12. [Source](https://www.bakerdonelson.com/str-inc)
13. [Source](https://www.yahoo.com/now/costar-group-selected-inclusion-p-130000026.html)
14. [CoStar Group is Selected for Inclusion in the S&P 500 Index, Joining a Premier Group of Some of the Largest and Most Successful Companies in the World. 2022](https://www.costargroup.com/costar-news/details/costar-group-is-selected-for-inclusion-in-the-s-p-500-index-joining-a-premier-group-of-some-of-the-largest-and-most-successful-companies-in-the-world)
15. Polygon.io
16. [Trustpilot](https://www.trustpilot.com/review/costar.com)
17. Google Knowledge Graph
18. [X](https://twitter.com/TheCoStarGroup)
19. [Source](https://www.costargroup.com/home/contact)
20. [Source](https://www.costar.com/)
21. Yelp
22. ROR release v1.51
23. [Source](https://golden.com/wiki/CoStar_Group_(company)-8AJWZDZ)
24. [Source](https://golden.com/wiki/CoStar_Group-ZGPNKP)
25. [Source](https://www.costargroup.com/careers)
26. YouTube API
27. Wikirate