CoStar Group Ownership | Who Owns CoStar Group?

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CoStar Group Ownership Summary

CoStar Group is owned by 98.15% institutional investors, 1.18% insiders, and 0.67% retail investors. Vanguard group is the largest institutional shareholder, holding 16.70% of CSGP shares. Vanguard Real Estate Index Investor is the top mutual fund, with 3.68% of its assets in CoStar Group shares.

CSGP Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	CoStar Group	98.15%	1.18%	0.67%
Sector	Real Estate Stocks	49.33%	9.10%	41.57%
Industry	Real Estate Services Stocks	37.73%	20.01%	42.26%
Idea	SaaS Stocks List	55.75%	6.52%	37.73%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	70.06M	16.70%	$5.91B
Blackrock	38.56M	9.51%	$2.86B
Blackrock funding, inc. /de	36.13M	8.61%	$3.05B
Bamco inc /ny/	19.26M	4.59%	$1.62B
Principal financial group	18.62M	4.44%	$1.57B
State street	18.28M	4.36%	$1.54B
Geode capital management	12.60M	3.00%	$1.06B
Akre capital management	9.31M	2.22%	$785.19M
Morgan stanley	8.54M	2.04%	$720.78M
Baillie gifford	8.24M	1.96%	$695.35B

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Visualize group lp	428.84K	12.12%	$36.18M
Caden capital partners, lp	349.50K	11.95%	$29.49M
Shawspring partners	896.03K	11.24%	$75.60M
Bares capital management	1.23M	9.54%	$103.46M
Mizuho markets americas	5.12M	8.14%	$432.25M
Akre capital management	9.31M	7.83%	$785.19M
Rgm capital	2.09M	7.43%	$176.56M
Thorntree capital partners lp	510.20K	6.59%	$43.05M
Vulcan value partners	3.83M	5.86%	$323.20M
Ion asset management	534.00K	4.95%	$45.05M

Top Buyers

Holder	Shares	% Assets	Change
Norges bank	5.46M	0.05%	5.46M
Nuveen	3.51M	0.08%	2.42M
D. e. shaw	1.43M	0.08%	1.36M
Vanguard group	70.06M	0.09%	1.21M
Morgan stanley	8.54M	0.04%	1.13M

Top Sellers

Holder	Shares	% Assets	Change
Capital investors	6.79M	0.09%	-8.03M
Janus henderson group	58.43K	0.00%	-6.57M
Artisan partners limited partnership	-	-	-5.64M
Toms capital investment management lp	-	-	-3.51M
T. rowe price investment management	3.51M	0.18%	-2.98M

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	5.46M	0.05%	5.46M	$390.75M
Jupiter asset management	383.23K	0.28%	383.23K	$32.33M
Axa investment managers	370.74K	0.08%	370.74K	$31.28M
Acadian asset management	162.51K	0.02%	162.51K	$13.70M
Hood river capital management	138.06K	0.14%	138.06K	$11.65M

Sold Out

Holder	Change
Millstone evans group	-1.00
Financial gravity asset management	-1.00
Bellwether advisors	-1.00
Westend advisors	-3.00
Goalvest advisory	-3.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Sep 30, 2025	899	1.12%	411,852,980	-0.11%	98	1.02%	450	-	306	-3.16%
Jun 30, 2025	878	-0.57%	423,827,379	0.20%	101	0.95%	446	-14.07%	311	19.16%
Mar 31, 2025	872	6.60%	422,553,425	4.90%	102	1.05%	513	19.03%	257	-7.89%
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%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Real Estate Index Investor	15.59M	3.68%	18.85K
Vanguard US Total Market Shares ETF	12.98M	3.17%	73.31K
Vanguard Total Stock Mkt Idx Inv	13.27M	3.13%	-308.16K
Vanguard Institutional 500 Index Trust	11.98M	2.84%	82.09K
Principal MidCap R5	10.84M	2.56%	-
Principal Aligned MidCap Equity	10.84M	2.56%	-103.39K
Vanguard 500 Index Investor	10.44M	2.46%	-1.53M
Vanguard Mid Cap Index Institutional	9.41M	2.22%	101.40K
Invesco QQQ Trust	8.70M	2.05%	60.34K
Akre Focus Instl	8.34M	1.98%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Nov 13, 2025	Hill John W	-	Sell	$154.53K
Nov 13, 2025	Cann Cynthia Cammett	Chief Accounting Officer	Sell	$126.64K
Aug 28, 2025	SAINT FREDERICK G.	President, Marketplaces	Sell	$2.26M
Jul 28, 2025	SAINT FREDERICK G.	President, Marketplaces	Sell	$2.33M
Jul 28, 2025	Cann Cynthia Cammett	Chief Accounting Officer	Sell	$188.76K

Insider Transactions Trends

Date	Buy	Sell
2025 Q3	-	3
2025 Q2	-	1
2025 Q1	-	1
2024 Q4	1	4
2024 Q3	-	1

CSGP Ownership FAQ

Who Owns CoStar Group?

CoStar Group shareholders are primarily institutional investors at 98.15%, followed by 1.18% insiders and 0.67% retail investors. The average institutional ownership in CoStar Group's industry, Real Estate Services Stocks , is 37.73%, which CoStar Group exceeds.

Who owns the most shares of CoStar Group?

CoStar Group’s largest shareholders are Vanguard group (70.06M shares, 16.70%), Blackrock (38.56M shares, 9.51%), and Blackrock funding, inc. /de (36.13M shares, 8.61%). Together, they hold 34.81% 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?

Visualize group lp is CoStar Group’s biggest shareholder by percentage of total assets invested, with 12.12% of its assets in 428.84K CoStar Group shares, valued at 36.18M$.

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 3.68% of its total shares outstanding invested in 15.59M CoStar Group shares.

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