CoStar Group Ownership | Who Owns CoStar Group?

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CoStar Group Ownership Summary

CoStar Group is owned by 98.72% institutional investors, 1.29% insiders. Vanguard group is the largest institutional shareholder, holding 16.15% of CSGP shares. Vanguard Real Estate Index Investor is the top mutual fund, with 3.71% of its assets in CoStar Group shares.

CSGP Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	CoStar Group	98.72%	1.29%	-0.01%
Sector	Real Estate Stocks	55.70%	8.24%	36.06%
Industry	Real Estate Services Stocks	42.06%	20.19%	37.75%
Idea	SaaS Stocks List	57.10%	6.98%	35.92%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	65.72M	16.15%	$4.70B
Blackrock	38.56M	9.51%	$2.86B
Blackrock funding, inc. /de	38.12M	9.37%	$2.73B
Bamco inc /ny/	19.20M	4.72%	$1.37B
Principal financial group	19.19M	4.72%	$1.37B
State street	17.03M	4.19%	$1.22B
Capital investors	14.03M	3.45%	$1.00B
Geode capital management	11.48M	2.82%	$819.68M
Akre capital management	9.31M	2.29%	$666.78M
Baillie gifford	7.91M	1.94%	$566.39M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Shawspring partners	909.80K	8.63%	$65.13M
Caden capital partners, lp	387.86K	8.47%	$27.77M
Rgm capital	2.21M	6.52%	$157.92M
Vulcan value partners	5.10M	6.10%	$364.96M
Akre capital management	9.31M	5.77%	$666.78M
Spyglass capital management	1.22M	4.92%	$87.45M
Thorntree capital partners lp	463.35K	4.31%	$33.17M
Bares capital management	649.21K	4.18%	$46.48M
Quantum capital management, llc / nj	538.05K	4.13%	$38.52M
Vantage investment partners	614.01K	3.83%	$43.96M

Top Buyers

Holder	Shares	% Assets	Change
Polen capital management	6.50M	1.26%	6.50M
Norges bank	5.46M	0.05%	5.46M
Capital investors	14.03M	0.19%	4.35M
Tiger global management	3.25M	0.88%	3.25M
D. e. shaw	1.43M	0.08%	1.36M

Top Sellers

Holder	Shares	% Assets	Change
Janus henderson group	58.43K	0.00%	-6.57M
Artisan partners limited partnership	-	-	-5.64M
Massachusetts financial services co /ma/	7.09M	0.16%	-4.29M
Farallon capital management	-	-	-2.59M
Westfield capital management co lp	75.08K	0.02%	-1.29M

New Positions

Holder	Shares	% Assets	Change	Value
Polen capital management	6.50M	1.26%	6.50M	$465.13M
Norges bank	5.46M	0.05%	5.46M	$390.75M
Tiger global management	3.25M	0.88%	3.25M	$232.32M
Shawspring partners	909.80K	8.63%	909.80K	$65.13M
Kensico capital management	715.80K	1.17%	715.80K	$51.24M

Sold Out

Holder	Change
Financial gravity asset management	-1.00
Hm payson	-2.00
Westend advisors	-3.00
Colonial trust advisors	-4.00
Tfo-tdc	-4.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2024	790	0.77%	401,576,180	2.36%	98	1.06%	413	4.03%	275	1.10%
Sep 30, 2024	780	-0.13%	392,212,657	-0.72%	96	1.02%	398	9.04%	268	-6.29%
Jun 30, 2024	772	-0.39%	394,936,743	0.38%	97	1.03%	362	-6.94%	281	5.64%
Mar 31, 2024	775	2.24%	393,422,705	-0.21%	96	1.03%	389	0.52%	266	1.92%
Dec 31, 2023	758	7.37%	394,254,902	0.66%	97	1.04%	387	13.49%	261	3.98%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Real Estate Index Investor	15.67M	3.71%	-189.15K
Vanguard US Total Market Shares ETF	12.98M	3.17%	73.31K
Vanguard Total Stock Mkt Idx Inv	12.99M	3.08%	-188.19K
Vanguard Institutional 500 Index Trust	11.37M	2.70%	76.17K
Principal Aligned MidCap Equity	11.03M	2.69%	2.70K
Principal MidCap R5	10.98M	2.60%	-15.31K
Vanguard Mid Cap Index Institutional	9.10M	2.16%	288.14K
Invesco QQQ Trust	8.44M	2.00%	-7.33K
Akre Focus Instl	8.34M	1.98%	-
Baron Partners Retail	7.02M	1.71%	-140.00K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Nov 11, 2024	Cann Cynthia Cammett	Chief Accounting Officer	Sell	$100.67K
Jul 31, 2024	Cann Cynthia Cammett	Chief Accounting Officer	Sell	$93.84K
Mar 10, 2025	Cann Cynthia Cammett	Chief Accounting Officer	Sell	$139.75K
Dec 10, 2024	Hill John W	-	Sell	$209.94K
Nov 27, 2024	NASSETTA CHRISTOPHER J	-	Sell	$135.14K

Insider Transactions Trends

Date	Buy	Sell
2025 Q1	-	-
2024 Q4	1	4
2024 Q3	-	1
2024 Q2	-	4
2024 Q1	-	-

CSGP Ownership FAQ

Who Owns CoStar Group?

CoStar Group shareholders are primarily institutional investors at 98.72%, followed by 1.29% insiders and -0.01% retail investors. The average institutional ownership in CoStar Group's industry, Real Estate Services Stocks , is 42.06%, which CoStar Group exceeds.

Who owns the most shares of CoStar Group?

CoStar Group’s largest shareholders are Vanguard group (65.72M shares, 16.15%), Blackrock (38.56M shares, 9.51%), and Blackrock funding, inc. /de (38.12M shares, 9.37%). Together, they hold 35.03% of CoStar Group’s total shares outstanding.

Does Blackrock own CoStar Group?

Yes, BlackRock owns 9.51% of CoStar Group, totaling 38.56M shares as of Jun 2024. This represents 0.06% of BlackRock's total assets, with a market value of 2.86B$. In the last quarter, BlackRock decreased its holdings by -325K shares, a -0.84% change.

Who is CoStar Group’s biggest shareholder by percentage of total assets invested?

Shawspring partners is CoStar Group’s biggest shareholder by percentage of total assets invested, with 8.63% of its assets in 909.8K CoStar Group shares, valued at 65.13M$.

Who is the top mutual fund holder of CoStar Group shares?

Vanguard Real Estate Index Investor is the top mutual fund holder of CoStar Group shares, with 3.71% of its total shares outstanding invested in 15.67M CoStar Group shares.

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