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NASDAQ: CSGP
Costar Group Inc Stock Ownership - Who owns Costar Group?

OverviewForecastEarningsRevenueDividendOwnership

Insider buying vs selling

Have Costar Group Inc insiders been buying or selling?

Buy
Sell
NameRoleDateSharesPriceValue
Andrew C. FlorancePresident and CEO2026-05-013,100$35.82
$111.04kBuy
Andrew C. FlorancePresident and CEO2026-05-0168,330$35.17
$2.40MBuy
Frank SimuroChief Technology Officer2026-03-1511,107$43.63
$484.60kSell
Gene BoxerGeneral Counsel and Secretary2026-03-15482$43.63
$21.03kSell
Michael J. DesmaraisChief Human Resources Officer2026-03-152,873$43.63
$125.35kSell
Cynthia Cammett CannChief Accounting Officer2026-03-151,194$43.63
$52.09kSell
Lisa RugglesSenior VP Global Operations2026-03-152,977$43.63
$129.89kSell
Gene BoxerGeneral Counsel and Secretary2026-03-15428$43.63
$18.67kSell
Louise S. SamsDirector2026-03-061,000$48.36
$48.36kBuy
Frederick G. SaintPresident Marketplaces2026-03-0220,000$45.33
$906.60kBuy

1 of 4

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Net Insider Buy/Sell (L12M) Ownership

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CSGP Shareholders

What type of owners hold Costar Group Inc stock?

Institutional
Insider
Retail
NameHoldSharesValueType
Vanguard Portfolio Management LLC9.36%38,234,133$1.30BInstitution
Blackrock Inc8.28%33,808,184$1.15BInstitution
Vanguard Capital Management LLC6.72%27,423,903$930.49MInstitution
State Street Corp4.57%18,650,975$632.83MInstitution
Principal Financial Group Inc4.33%17,696,192$600.43MInstitution
Bamco Inc4.00%16,314,175$553.54MInstitution
Capital International Investors3.80%15,513,753$526.38MInstitution
Baillie Gifford Co3.33%13,610,922$461.82MInstitution
Polen Capital Management LLC3.08%12,570,368$426.51MInstitution
Geode Capital Management LLC3.05%12,448,652$422.38MInstitution

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CSGP vs Real Estate Service Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
CSGP98.49%1.51%Net SellingNet Buying
JLL93.45%2.94%Net SellingNet Selling
BEKE4.11%5.07%Net SellingNet Selling
FSV69.09%0.00%
CIGI72.58%19.99%
View Top Real Estate Service Stocks

Costar Group Stock Ownership FAQ

Who owns Costar Group?

Costar Group (NASDAQ: CSGP) is owned by 99.65% institutional shareholders, 1.52% Costar Group insiders, and 0.00% retail investors. Vanguard Portfolio Management LLC is the largest individual Costar Group shareholder, owning 38.23M shares representing 9.36% of the company. Vanguard Portfolio Management LLC's Costar Group shares are currently valued at $1.31B.

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