CoStar Group Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

NasdaqGS:CSGP Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Shares	Max Price
13 Nov 25	SellUS$126,642	Cynthia Cann	Individual	1,841	US$68.79
13 Nov 25	SellUS$154,530	John Hill	Individual	2,250	US$68.68
28 Aug 25	SellUS$2,258,250	Frederick Saint	Individual	25,000	US$90.33
28 Jul 25	SellUS$188,764	Cynthia Cann	Individual	2,033	US$92.85
28 Jul 25	SellUS$2,330,750	Frederick Saint	Individual	25,000	US$93.23
11 Jun 25	SellUS$2,027,500	Frederick Saint	Individual	25,000	US$81.10
10 Mar 25	SellUS$334,259	Cynthia Cann	Individual	4,259	US$79.90

Insider Trading Volume

Insider Buying: Insufficient data to determine if insiders have bought more shares than they have sold in the past 3 months.

Ownership Breakdown

What is the ownership structure of CSGP?
Owner Type	Number of Shares	Ownership Percentage
Public Companies	64	0.000015%
Private Companies	1,088	0.000256%
State or Government	403,216	0.0947%
Individual Insiders	4,970,620	1.17%
Institutions	420,454,035	98.7%

Dilution of Shares: Shareholders have not been meaningfully diluted in the past year.

Top Shareholders

Top 25 shareholders own 67.11% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
16.7%	The Vanguard Group, Inc.	70,108,999	US$3.3b	0.08%	0.04%
8.09%	BlackRock, Inc.	33,968,986	US$1.6b	-5.98%	0.02%
4.64%	Baron Capital Group, Inc.	19,498,099	US$928.1m	1.26%	2.27%
4.44%	State Street Global Advisors, Inc.	18,632,352	US$886.9m	1.9%	0.03%
4.19%	Principal Global Investors, LLC	17,594,348	US$837.5m	-5.69%	0.34%
3.91%	Capital Research and Management Company	16,419,821	US$781.6m	39.2%	0.03%
3.08%	Baillie Gifford & Co.	12,933,185	US$615.6m	56.9%	0.29%
2.9%	Geode Capital Management, LLC	12,182,167	US$579.9m	-3.33%	0.03%
2.29%	Akre Capital Management, LLC	9,617,805	US$457.8m	3.35%	4.59%
1.78%	Janus Henderson Group plc	7,473,380	US$355.7m	20.2%	0.12%
1.69%	Norges Bank Investment Management	7,090,495	US$337.5m	33.6%	0.02%
1.17%	Polen Capital Management, LLC	4,890,936	US$232.8m	-23.4%	1.05%
1.12%	Invesco Capital Management LLC	4,699,728	US$223.7m	19.9%	0.06%
1.11%	T. Rowe Price Group, Inc.	4,663,626	US$222.0m	-2.33%	0.02%
1.08%	UBS Asset Management AG	4,544,107	US$216.3m	-35.7%	0.02%
1.07%	Vulcan Value Partners, LLC	4,485,021	US$213.5m	17.1%	3.06%
1.06%	Mizuho Financial Group, Inc.	4,446,976	US$211.7m	-13.7%	0.43%
1.01%	Amundi Asset Management SAS	4,259,814	US$202.8m	30.8%	0.03%
0.96%	BNY Asset Management	4,044,004	US$192.5m	-5.87%	0.03%
0.93%	Nomura Investment Management Business Trust	3,909,161	US$186.1m	-6.97%	0.22%
0.84%	Teachers Insurance and Annuity Association-College Retirement Equities Fund	3,512,143	US$167.2m	1.42%	0.03%
0.83%	Northern Trust Global Investments	3,466,062	US$165.0m	-7.63%	0.02%
0.75%	Third Point LLC	3,165,000	US$150.7m	4.91%	1.88%
0.75%	Massachusetts Financial Services Company	3,159,925	US$150.4m	-57.3%	0.03%
0.7%	Eaton Vance Management	2,945,895	US$140.2m	-12.7%	0.02%

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2026/03/05 11:59
End of Day Share Price	2026/03/05 00:00
Earnings	2025/12/31
Annual Earnings	2025/12/31

Data Sources

The data used in our company analysis is from S&P Global Market Intelligence LLC. The following data is used in our analysis model to generate this report. Data is normalised which can introduce a delay from the source being available.

Package	Data	Timeframe	Example US Source ^*
Company Financials	10 years	Income statement Cash flow statement Balance sheet	SEC Form 10-K SEC Form 10-Q
Analyst Consensus Estimates	+3 years	Forecast financials Analyst price targets	Analyst Research Reports Blue Matrix
Market Prices	30 years	Stock prices Dividends, Splits and Actions	ICE Market Data SEC Form S-1
Ownership	10 years	Top shareholders Insider trading	SEC Form 4 SEC Form 13D
Management	10 years	Leadership team Board of directors	SEC Form 10-K SEC Form DEF 14A
Key Developments	10 years	Company announcements	SEC Form 8-K

^* Example for US securities, for non-US equivalent regulatory forms and sources are used.

Unless specified all financial data is based on a yearly period but updated quarterly. This is known as Trailing Twelve Month (TTM) or Last Twelve Month (LTM) Data. Learn more.

Analysis Model and Snowflake

Details of the analysis model used to generate this report is available on our Github page, we also have guides on how to use our reports and tutorials on Youtube.

Learn about the world class team who designed and built the Simply Wall St analysis model.

Industry and Sector Metrics

Our industry and section metrics are calculated every 6 hours by Simply Wall St, details of our process are available on Github.

Analyst Sources

CoStar Group, Inc. is covered by 25 analysts. 20 of those analysts submitted the estimates of revenue or earnings used as inputs to our report. Analysts submissions are updated throughout the day.

Analyst	Institution
Jeffrey Meuler	Baird
Jeffrey Silber	BMO Capital Markets Equity Research
Nicholas Jones	BNP Paribas