CoStar Group Ownership | Who Owns CoStar Group?

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CoStar Group Ownership Summary

CoStar Group is owned by 100.69% institutional investors, 1.26% insiders. Vanguard group is the largest institutional shareholder, holding 16.70% of CSGP shares. Vanguard Real Estate Index Investor is the top mutual fund, with 3.92% of its assets in CoStar Group shares.

CSGP Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	CoStar Group	100.69%	1.26%	-1.95%
Sector	Real Estate Stocks	73.68%	9.54%	16.78%
Industry	Real Estate Services Stocks	46.49%	18.61%	34.89%
Idea	SaaS Stocks List	75.83%	6.55%	17.62%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	70.11M	16.70%	$4.71B
Blackrock	38.56M	9.51%	$2.86B
Blackrock funding, inc. /de	33.81M	8.19%	$957.61M
Vanguard capital management	26.68M	6.46%	$755.68M
Bamco inc /ny/	21.63M	5.24%	$612.47M
State street	18.41M	4.46%	$521.40M
Capital investors	16.64M	4.03%	$471.33M
Baillie gifford	13.15M	3.19%	$372.53M
Geode capital management	12.17M	2.95%	$343.30M
Akre capital management	11.70M	2.83%	$331.33M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Bares capital management	1.23M	9.54%	$103.46M
Rgm capital	2.09M	7.43%	$176.56M
Akre capital management	11.70M	6.47%	$331.33M
Tsai capital	294.21K	6.16%	$8.33M
Meritage group lp	5.39M	5.89%	$152.76M
Ion asset management	534.00K	4.95%	$45.05M
Ivy lane capital management	105.00K	4.31%	$2.97M
Spyglass capital management	2.69M	4.13%	$76.31M
Ownership capital b.v.	50.82K	2.41%	$4.29M
Caden capital partners, lp	6.82K	2.33%	$193.17K

Top Buyers

Holder	Shares	% Assets	Change
Aqr capital management	8.45M	0.08%	7.18M
Edgepoint investment group	5.95M	1.27%	5.95M
Norges bank	5.95M	0.02%	5.95M
Bamco inc /ny/	21.63M	0.92%	5.31M
Qube research	3.22M	0.08%	3.22M

Top Sellers

Holder	Shares	% Assets	Change
Principal financial group	3.79M	0.05%	-13.91M
Artisan partners limited partnership	-	-	-5.64M
D. e. shaw	1.04M	0.01%	-4.87M
Vulcan value partners	-	-	-4.49M
Goldman sachs group	5.13M	0.01%	-4.12M

New Positions

Holder	Shares	% Assets	Change	Value
Edgepoint investment group	5.95M	1.27%	5.95M	$168.50M
Norges bank	5.95M	0.02%	5.95M	$168.50M
Qube research	3.22M	0.08%	3.22M	$91.14M
Sixth street partners management company	2.96M	0.01%	2.96M	$83.90M
United asset strategies	489.01K	0.98%	489.01K	$13.85M

Sold Out

Holder	Change
Bellwether advisors	-1.00
Financial gravity asset management	-1.00
Hollencrest capital management	-1.00
Scarborough advisors	-1.00
Rialto wealth management	-1.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	781	-6.02%	415,838,263	1.73%	100	1.03%	411	-6.38%	266	-4.66%
Mar 31, 2026	625	-29.22%	274,637,197	-33.49%	65	0.68%	316	-16.40%	217	-44.78%
Dec 31, 2025	735	-21.39%	358,209,909	-13.36%	85	0.88%	305	-33.98%	340	6.25%
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%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Real Estate Index Investor	15.90M	3.92%	-8.83K
Baron Partners Retail	15.49M	3.79%	8.24M
Vanguard MStar Total Stk Mkt Idx Invest	13.01M	3.21%	37.48K
Vanguard Morn Total Stk Mkt Idx Investor	12.97M	3.18%	-401.17K
Vanguard Total Stock Mkt Idx Inv	12.97M	3.18%	-401.17K
Vanguard US Total Market Shares ETF	12.98M	3.17%	73.31K
Vanguard Institutional 500 Index Trust	11.98M	2.84%	82.09K
Vanguard 500 Index Investor	10.71M	2.64%	112.71K
Principal Aligned MidCap Equity	10.62M	2.53%	-
Invesco QQQ Trust	8.98M	2.20%	66.06K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Aug 07, 2026	Cann Cynthia Cammett	Chief Accounting Officer	Sell	$147.37K
Aug 05, 2026	Hill John W	-	Sell	$105.73K
Aug 04, 2026	FLORANCE ANDREW C	Founder and CEO	Buy	$2.49M
May 01, 2026	FLORANCE ANDREW C	President and CEO	Buy	$2.40M
May 01, 2026	FLORANCE ANDREW C	President and CEO	Buy	$111.04K

Insider Transactions Trends

Date	Buy	Sell
2026 Q3	1	-
2026 Q2	2	-
2026 Q1	4	-
2025 Q4	-	2
2025 Q3	-	3

CSGP Ownership FAQ

Who Owns CoStar Group?

CoStar Group shareholders are primarily institutional investors at 100.69%, followed by 1.26% insiders and -1.95% retail investors. The average institutional ownership in CoStar Group's industry, Real Estate Services Stocks , is 46.49%, which CoStar Group exceeds.

Who owns the most shares of CoStar Group?

CoStar Group’s largest shareholders are Vanguard group (70.11M shares, 16.70%), Blackrock (38.56M shares, 9.51%), and Blackrock funding, inc. /de (33.81M shares, 8.19%). Together, they hold 34.39% 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?

Bares capital management is CoStar Group’s biggest shareholder by percentage of total assets invested, with 9.54% of its assets in 1.23M CoStar Group shares, valued at 103.46M$.

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 3.92% of its total shares outstanding invested in 15.9M CoStar Group shares.

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