CoStar Group (CSGP) - Market capitalization

Market cap: £18.66 Billion

As of January 2026 CoStar Group has a market cap of £18.66 Billion. This makes CoStar Group the world's 957th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.

Market cap history of CoStar Group from 1998 to 2026

End of year Market Cap

Year	Marketcap	Change
2026	£18.66 B	-11.51%
2025	£21.08 B	-10.62%
2024	£23.59 B	-15.77%
2023	£28.01 B	7.83%
2022	£25.97 B	12.35%
2021	£23.12 B	-13.49%
2020	£26.72 B	59.76%
2019	£16.73 B	72.73%
2018	£9.68 B	21.96%
2017	£7.94 B	59.51%
2016	£4.97 B	9.81%
2015	£4.53 B	18.95%
2014	£3.81 B	18.08%
2013	£3.22 B	105.94%
2012	£1.56 B	44.1%
2011	£1.08 B	40.52%
2010	£0.77 B	45.47%
2009	£0.53 B	19.99%
2008	£0.44 B	-4.24%
2007	£0.46 B	-11.23%
2006	£0.52 B	11.61%
2005	£0.46 B	6.18%
2004	£0.44 B	5.65%
2003	£0.41 B	129.08%
2002	£0.18 B	-30.11%
2001	£0.26 B	5.78%
2000	£0.24 B	-14.53%
1999	£0.28 B	332.32%
1998	£66.59 M

End of Day market cap according to different sources

On Jan 12th, 2026 the market cap of CoStar Group was reported to be:

£18.66 Billion

by Nasdaq

£18.66 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
TechTarget TTGT	£0.28 B	-98.46%	🇺🇸 USA
Movano MOVE	£4.5 M	-99.98%	🇺🇸 USA
Accenture ACN	£129.36 B	593.26%	🇮🇪 Ireland
Magellan Health MGLN	£1.85 B	-90.05%	🇺🇸 USA

What is the market capitalization of a company?

The market capitalization sometimes referred as Marketcap, is the value of a publicly listed company.
In most cases it can be easily calculated by multiplying the share price with the amount of outstanding shares.

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Market capitalization of CoStar Group (CSGP)

Market cap: £18.66 Billion