CoStar Group Ownership | Who Owns CoStar Group?

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CoStar Group Ownership Summary

CoStar Group is owned by 65.83% institutional investors, 1.21% insiders, and 32.96% 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 3.89% of its assets in CoStar Group shares.

CSGP Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	CoStar Group	65.83%	1.21%	32.96%
Sector	Real Estate Stocks	49.59%	9.70%	40.71%
Industry	Real Estate Services Stocks	29.28%	19.69%	51.03%
Idea	SaaS Stocks List	59.32%	6.71%	33.97%

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	8.10%	$1.36B
State street	18.65M	4.47%	$752.38M
Principal financial group	17.70M	4.24%	$713.87M
Bamco inc /ny/	16.31M	3.91%	$658.11M
Capital investors	15.51M	3.72%	$625.82M
Baillie gifford	13.61M	3.26%	$549.06M
Polen capital management	12.57M	3.01%	$507.09M
Geode capital management	12.45M	2.98%	$500.45M

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
Tsai capital	226.73K	6.81%	$9.15M
Akre capital management	10.35M	6.80%	$417.45M
Shawspring partners	339.08K	5.11%	$13.68M
Meritage group lp	3.33M	5.07%	$134.29M
Ion asset management	534.00K	4.95%	$45.05M
Ivy lane capital management	59.00K	3.60%	$2.38M
Polen capital management	12.57M	3.51%	$507.09M
Landmark investment partners	119.97K	3.47%	$4.84M

Top Buyers

Holder	Shares	% Assets	Change
Polen capital management	12.57M	3.51%	7.68M
Norges bank	7.09M	0.05%	7.09M
Goldman sachs group	9.25M	0.04%	5.49M
D. e. shaw	5.91M	0.14%	5.00M
Capital investors	15.51M	0.15%	4.67M

Top Sellers

Holder	Shares	% Assets	Change
Artisan partners limited partnership	-	-	-5.64M
Vulcan value partners	-	-	-4.49M
Mizuho markets americas	275.88K	0.30%	-4.14M
Toms capital investment management lp	-	-	-3.51M
T. rowe price investment management	-	-	-3.46M

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	7.09M	0.05%	7.09M	$476.76M
Meritage group lp	3.33M	5.07%	3.33M	$134.29M
Vanguard fiduciary trust	2.39M	0.02%	2.39M	$96.46M
Greenhouse funds lllp	1.38M	2.49%	1.38M	$55.56M
Voloridge investment management	1.33M	0.21%	1.33M	$53.65M

Sold Out

Holder	Change
Millstone evans group	-1.00
Bellwether advisors	-1.00
Scarborough advisors	-1.00
Financial gravity asset management	-1.00
Parallax volatility advisers	-2.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Mar 31, 2025	872	6.60%	422,553,425	4.90%	102	1.05%	513	19.03%	257	-7.89%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Real Estate Index Investor	15.90M	3.89%	247.82K
Baron Partners Retail	15.49M	3.79%	8.24M
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	10.60M	2.60%	-492.92K
Principal Aligned MidCap Equity	10.62M	2.53%	-
Invesco QQQ Trust	8.98M	2.20%	66.06K
Akre Focus ETF	8.49M	2.08%	-
Akre Focus Instl	8.34M	1.98%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
May 01, 2026	FLORANCE ANDREW C	President and CEO	Buy	$111.04K
May 01, 2026	FLORANCE ANDREW C	President and CEO	Buy	$2.40M
Mar 06, 2026	Sams Louise S	-	Buy	$48.36K
Mar 02, 2026	Glaser Rachel C	-	Buy	$44.94K
Mar 02, 2026	SAINT FREDERICK G.	President, Marketplaces	Buy	$906.60K

Insider Transactions Trends

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

CSGP Ownership FAQ

Who Owns CoStar Group?

CoStar Group shareholders are primarily institutional investors at 65.83%, followed by 1.21% insiders and 32.96% retail investors. The average institutional ownership in CoStar Group's industry, Real Estate Services Stocks , is 29.28%, 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, 8.10%). Together, they hold 34.31% 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 3.89% of its total shares outstanding invested in 15.9M CoStar Group shares.

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