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CoStar Group Ownership | Who Owns CoStar Group?

OverviewForecastRevenueFinancialsChartTranscripts

CoStar Group Ownership Summary

CoStar Group is owned by 101.01% institutional investors, 1.18% 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 3.68% of its assets in CoStar Group shares.

CSGP Ownership Benchmark

TypeName% Inst% Insiders% Retail
StockCoStar Group101.01%1.18%-2.19%
SectorReal Estate Stocks 69.85%9.10%21.05%
IndustryReal Estate Services Stocks 52.31%20.50%27.18%
IdeaSaaS Stocks List73.64%6.57%19.79%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Vanguard group65.72M16.15%$4.70B
Blackrock38.56M9.51%$2.86B
Blackrock funding, inc. /de35.04M8.35%$2.82B
Principal financial group19.19M4.72%$1.37B
Bamco inc /ny/19.68M4.69%$1.58B
State street17.03M4.19%$1.22B
Capital investors14.82M3.53%$1.19B
Geode capital management11.48M2.82%$819.68M
Akre capital management9.31M2.22%$748.46M
Baillie gifford7.91M1.94%$566.39M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Mizuho markets americas5.86M14.33%$470.93M
Shawspring partners1.36M13.76%$109.03M
Bares capital management1.21M9.48%$97.66M
Caden capital partners, lp387.86K8.47%$27.77M
Akre capital management9.31M7.33%$748.46M
Rgm capital2.12M6.91%$170.67M
Vulcan value partners3.72M5.45%$309.13M
Sg capital management940.15K5.22%$75.59M
Ion asset management1.17M5.17%$94.05M
Thorntree capital partners lp463.35K4.31%$33.17M

Top Buyers

HolderShares% AssetsChange
Norges bank5.46M0.05%5.46M
Viking global investors lp3.22M0.75%3.22M
D. e. shaw1.43M0.08%1.36M
Third point3.08M3.25%1.11M
Ion asset management1.17M5.17%1.03M

Top Sellers

HolderShares% AssetsChange
Janus henderson group58.43K0.00%-6.57M
Artisan partners limited partnership---5.64M
Toms capital investment management lp---3.51M
Farallon capital management---2.59M
Blackrock funding, inc. /de35.04M0.05%-2.42M

New Positions

HolderShares% AssetsChangeValue
Norges bank5.46M0.05%5.46M$390.75M
Sg capital management940.15K5.22%940.15K$75.59M
Thorntree capital partners lp463.35K4.31%463.35K$33.17M
Douglas lane & associates383.38K0.39%383.38K$27.45M
No street gp lp355.00K1.68%355.00K$25.41M

Sold Out

HolderChange
Financial gravity asset management-1.00
Aspect partners-2.00
Hm payson-2.00
Westend advisors-3.00
Goalvest advisory-3.00

Institutional Ownership Trends

DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Jun 30, 2025878-0.57%423,827,3790.20%1010.95%446-14.07%31119.16%
Mar 31, 20258726.60%422,553,4254.90%1021.05%51319.03%257-7.89%
Dec 31, 20247900.77%401,576,1802.36%981.06%4134.03%2751.10%
Sep 30, 2024780-0.13%392,212,657-0.72%961.02%3989.04%268-6.29%
Jun 30, 2024772-0.39%394,936,7430.38%971.03%362-6.94%2815.64%

Top Mutual Funds Shareholders

HolderShares% HoldingChange
Vanguard Real Estate Index Investor15.59M3.68%18.85K
Vanguard US Total Market Shares ETF12.98M3.17%73.31K
Vanguard Total Stock Mkt Idx Inv13.27M3.13%-308.16K
Vanguard Institutional 500 Index Trust11.98M2.84%82.09K
Principal MidCap R510.84M2.56%-
Principal Aligned MidCap Equity10.84M2.56%-103.39K
Vanguard 500 Index Investor10.44M2.46%-1.53M
Vanguard Mid Cap Index Institutional9.41M2.22%101.40K
Invesco QQQ Trust8.66M2.04%-5.42K
Akre Focus Instl8.34M1.98%-

Recent Insider Transactions

DateNameRoleActivityValue
Aug 28, 2025SAINT FREDERICK G. President, MarketplacesSell$2.26M
Jul 28, 2025SAINT FREDERICK G. President, MarketplacesSell$2.33M
Jul 28, 2025Cann Cynthia Cammett Chief Accounting OfficerSell$188.76K
Jun 11, 2025SAINT FREDERICK G. President, MarketplacesSell$2.03M
Mar 10, 2025Cann Cynthia Cammett Chief Accounting OfficerSell$139.75K

Insider Transactions Trends

DateBuySell
2025 Q3-3
2025 Q2-1
2025 Q1-1
2024 Q414
2024 Q3-1

CSGP Ownership FAQ

Who Owns CoStar Group?

CoStar Group shareholders are primarily institutional investors at 101.01%, followed by 1.18% insiders and -2.19% retail investors. The average institutional ownership in CoStar Group's industry, Real Estate Services Stocks , is 52.31%, 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 (35.04M shares, 8.35%). Together, they hold 34.01% 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?

Mizuho markets americas is CoStar Group’s biggest shareholder by percentage of total assets invested, with 14.33% of its assets in 5.86M CoStar Group shares, valued at 470.93M$.

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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