WallStreetZenWallStreetZen

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
Christian M. LownChief Financial Officer2026-07-015,597$29.36
$164.33kSell
Cynthia Cammett CannChief Accounting Officer2026-06-15461$32.04
$14.77kSell
Andrew C. FlorancePresident and CEO2026-05-013,100$35.82
$111.04kBuy
Andrew C. FlorancePresident and CEO2026-05-0168,330$35.17
$2.40MBuy
Gene BoxerGeneral Counsel and Secretary2026-03-15428$43.63
$18.67kSell
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
Lisa RugglesSenior VP Global Operations2026-03-152,977$43.63
$129.89kSell
Cynthia Cammett CannChief Accounting Officer2026-03-151,194$43.63
$52.09kSell

1 of 4

CSGP insiders have sold more... subscribe to Premium to read more.
Net Insider Buy/Sell (L12M) Ownership

Be the first to know when CSGP insiders and whales buy or sell their stock.

CSGP Shareholders

What type of owners hold Costar Group Inc stock?

Institutional
Insider
Retail
NameHoldSharesValueType
Vanguard Portfolio Management LLC9.36%38,234,133$1.06BInstitution
Blackrock Inc8.28%33,808,184$935.13MInstitution
Vanguard Capital Management LLC6.72%27,423,903$758.55MInstitution
State Street Corp4.57%18,650,975$515.89MInstitution
Principal Financial Group Inc4.33%17,696,192$489.48MInstitution
Bamco Inc4.00%16,314,175$451.25MInstitution
Capital International Investors3.80%15,513,753$429.11MInstitution
Baillie Gifford Co3.33%13,610,922$376.48MInstitution
Polen Capital Management LLC3.08%12,570,368$347.70MInstitution
Geode Capital Management LLC3.05%12,448,652$344.33MInstitution

1 of 3

CSGP vs Real Estate Service Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
CSGP98.48%1.52%Net SellingNet Buying
JLL93.46%2.94%Net SellingNet Selling
FSV70.07%0.00%
CIGI72.58%19.99%
BEKE4.11%5.07%Net Selling
View Top Real Estate Service Stocks

Costar Group Stock Ownership FAQ

Who owns Costar Group?

Costar Group (NASDAQ: CSGP) is owned by 99.66% institutional shareholders, 1.54% 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 $1.06B.

If you're new to stock investing, here's how to buy Costar Group stock.
©2026 WallStreetZen
Company
AboutNewsBlogStock Investing FAQPlansPrivacy PolicyTerms of ServiceCancellation & RefundsPerformanceHelp GuidesContactTwitterYouTubeNewsletter
Stock Tools
Top Performing AnalystsStock ScreenerStock ForecastTrending StocksStrong Buy StocksHighest Earnings StocksBest Dividend Paying StocksStatisticsStock Market SectorsStock Market IndustriesHow to Buy Stocks Online
Stock Ideas
Buy The DipBiggest Stock Gainers TodayBiggest Stock Losers Today52 Week High Stocks52 Week Low StocksMost Active Stocks TodayMost Undervalued StocksBest Penny Stocks to Buy NowBest Stocks Under $5Best Stocks Under $10
WallStreetZen does not provide financial advice and does not issue recommendations or offers to buy stock or sell any security.

Information is provided 'as-is' and solely for informational purposes and is not advice. WallStreetZen does not bear any responsibility for any losses or damage that may occur as a result of reliance on this data.