CoStar Group Ownership | Who Owns CoStar Group?

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CoStar Group Ownership Summary

CoStar Group is owned by 85.31% institutional investors, 1.18% insiders, and 13.51% 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 3.75% of its assets in CoStar Group shares.

CSGP Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	CoStar Group	85.31%	1.18%	13.51%
Sector	Real Estate Stocks	42.56%	9.05%	48.39%
Industry	Real Estate Services Stocks	29.62%	20.29%	50.08%
Idea	SaaS Stocks List	48.24%	6.71%	45.05%

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	33.97M	8.09%	$2.28B
Bamco inc /ny/	19.26M	4.59%	$1.62B
State street	18.28M	4.36%	$1.54B
Principal financial group	17.57M	4.18%	$1.18B
Baillie gifford	12.93M	3.08%	$869.63M
Geode capital management	12.18M	2.90%	$816.24M
Capital investors	10.84M	2.58%	$729.02M
Akre capital management	9.62M	2.29%	$646.70M

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
Rgm capital	2.09M	7.43%	$176.56M
Akre capital management	9.62M	7.09%	$646.70M
Thorntree capital partners lp	510.20K	6.59%	$43.05M
Tradelink capital	11.36K	6.11%	$764.00K
Mizuho markets americas	4.42M	5.74%	$296.94M
Vulcan value partners	4.49M	5.54%	$301.53M

Top Buyers

Holder	Shares	% Assets	Change
Norges bank	7.09M	0.05%	7.09M
Baillie gifford	12.93M	0.72%	4.69M
Capital investors	10.84M	0.11%	4.05M
Goldman sachs group	3.75M	0.03%	1.56M
Jupiter asset management	1.86M	1.00%	1.48M

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/	3.16M	0.07%	-4.25M
Toms capital investment management lp	-	-	-3.51M
Morgan stanley	5.29M	0.02%	-3.25M

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	7.09M	0.05%	7.09M	$476.76M
Axa investment managers	370.74K	0.08%	370.74K	$31.28M
Cibc world markets	186.14K	0.06%	186.14K	$12.52M
Hood river capital management	138.06K	0.14%	138.06K	$11.65M
Fjarde ap-fonden (the fourth swedish national pensionfund)	63.47K	0.05%	63.47K	$4.71M

Sold Out

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

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Dec 31, 2024	790	0.77%	401,576,180	2.36%	98	1.06%	413	4.03%	275	1.10%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Real Estate Index Investor	15.73M	3.75%	47.22K
Vanguard Total Stock Mkt Idx Inv	13.31M	3.17%	29.10K
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	10.80M	2.57%	67.49K
Principal MidCap R5	10.62M	2.53%	5.43M
Principal Aligned MidCap Equity	10.62M	2.53%	-301.43K
Vanguard Mid Cap Index Institutional	9.18M	2.19%	-48.06K
Invesco QQQ Trust	9.06M	2.16%	-20.07K
Akre Focus ETF	8.32M	1.98%	-1.08M

Recent Insider Transactions

Date	Name	Role	Activity	Value
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
Feb 27, 2026	FLORANCE ANDREW C	President and CEO	Buy	$2.48M
Nov 13, 2025	Hill John W	-	Sell	$154.53K

Insider Transactions Trends

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

CSGP Ownership FAQ

Who Owns CoStar Group?

CoStar Group shareholders are primarily institutional investors at 85.31%, followed by 1.18% insiders and 13.51% retail investors. The average institutional ownership in CoStar Group's industry, Real Estate Services Stocks , is 29.62%, 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 (33.97M shares, 8.09%). Together, they hold 34.29% 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 3.75% of its total shares outstanding invested in 15.73M CoStar Group shares.

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