CoStar Group Ownership

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

Recent Insider Transactions

BIT:1CSGP Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Shares	Max Price
28 Aug 25	Sell€1,936,449	Frederick Saint	Individual	25,000	€77.46
28 Jul 25	Sell€162,450	Cynthia Cann	Individual	2,033	€79.91
28 Jul 25	Sell€2,005,843	Frederick Saint	Individual	25,000	€80.23
11 Jun 25	Sell€1,765,547	Frederick Saint	Individual	25,000	€70.62
10 Mar 25	Sell€308,420	Cynthia Cann	Individual	4,259	€73.72
10 Dec 24	Sell€199,820	John Hill	Individual	2,735	€73.06
27 Nov 24	Sell€127,973	Christopher Nassetta	Individual	1,681	€76.13
26 Nov 24	Sell€419,570	Michael Desmarais	Individual	5,500	€76.29

Insider Trading Volume

Insider Buying: 1CSGP insiders have only sold shares in the past 3 months.

Ownership Breakdown

What is the ownership structure of 1CSGP?
Owner Type	Number of Shares	Ownership Percentage
State or Government	415,773	0.0956%
Individual Insiders	5,250,497	1.21%
Institutions	429,134,067	98.7%

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

Top Shareholders

Top 25 shareholders own 67.88% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
16.2%	The Vanguard Group, Inc.	68,847,483	€4.0b	0.61%	0.06%
8.27%	BlackRock, Inc.	35,036,320	€2.0b	-6.46%	0.03%
4.64%	Baron Capital Group, Inc.	19,679,935	€1.1b	3.4%	3.2%
4.43%	Capital Research and Management Company	18,772,191	€1.1b	3.65%	0.05%
4.4%	Principal Global Investors, LLC	18,653,144	€1.1b	-0.12%	0.56%
4.18%	State Street Global Advisors, Inc.	17,732,968	€1.0b	0.9%	0.04%
2.92%	Geode Capital Management, LLC	12,357,840	€721.5m	2.41%	0.05%
2.2%	Akre Capital Management, LLC	9,309,232	€543.5m	-0.05%	5.41%
1.94%	Baillie Gifford & Co.	8,241,642	€481.2m	-3.5%	0.25%
1.81%	UBS Asset Management AG	7,689,632	€449.0m	5.47%	0.04%
1.81%	T. Rowe Price Group, Inc.	7,689,469	€448.9m	3.06%	0.04%
1.75%	Massachusetts Financial Services Company	7,406,788	€432.4m	12.5%	0.11%
1.63%	Polen Capital Management, LLC	6,923,828	€404.2m	0%	1.38%
1.25%	Norges Bank Investment Management	5,308,249	€309.9m	-2.75%	0.02%
1.22%	Mizuho Financial Group, Inc.	5,154,072	€300.9m	-12.4%	0.81%
1.12%	Macquarie Investment Management Business Trust	4,765,057	€278.2m	-21.9%	0.4%
1.11%	Morgan Stanley	4,725,287	€275.9m	-13.1%	0.03%
1.01%	BNY Asset Management	4,296,115	€250.8m	-10.2%	0.05%
0.95%	Janus Henderson Group plc	4,035,827	€235.6m	7,520%	0.1%
0.91%	Northern Trust Global Investments	3,866,232	€225.7m	-4%	0.03%
0.9%	Invesco Capital Management LLC	3,820,160	€223.0m	3.25%	0.08%
0.88%	Vulcan Value Partners, LLC	3,716,484	€217.0m	-23.1%	3.54%
0.77%	Tiger Global Management, LLC	3,245,109	€189.5m	0%	0.59%
0.76%	Viking Global Investors LP	3,218,568	€187.9m	0%	0.6%
0.75%	Amundi Asset Management SAS	3,198,575	€186.7m	-5.94%	0.04%

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2025/11/09 15:11
End of Day Share Price	2025/11/07 00:00
Earnings	2025/09/30
Annual Earnings	2024/12/31

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 26 analysts. 19 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
Curtis Nagle	BofA Global Research