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COSTAR GROUP, INC. insider trading

CSGPNASDAQ
$27.38-0.34 (-1.23%)as of Oct 2, 2026

“Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise.” — Peter Lynch

Insider Trading vs Stock Price

Insider Trading vs Stock Price data

Showing the 1Y range: Oct 2, 2025 to Oct 2, 2026. Price (-67.4%). 0 insider transactions plotted in this window as 0 markers; nearby trades of the same kind are grouped.

Transactions plotted on the price chart
DateCategoryPersonRoleActionAmountChange in holding
Open market purchase
Open market sell
Marker size reflects transaction size.

Net dollar flow · Buy / Sell balance

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Key players

  • MRMichael R. KleinDirector0.4562%of company
  • ACAndrew C. FloranceFounder and CEO0.4457%of company
  • FSFrank SimuroChief Technology Officer0.1023%of company
  • GSG. Saint FrederickPresident, Marketplaces0.0687%of company
  • CJChristopher J. NassettaDirector0.068%of company
  • LRLisa RugglesSenior VP, Global Operations0.0432%of company
  • CMChristian M. LownChief Financial Officer0.032%of company
  • GBGene BoxerGeneral Counsel and Secretary0.0236%of company
  • MJMichael J. DesmaraisChief Human Resources Officer0.0217%of company
  • RJRobin Jack RossmannChief Financial Officer0.0214%of company

AI Activity Analysis

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Insider activity

Fromto
CompanyInsider / roleActionΔOwnAvg priceAmount
CSGPCynthia Cammett CannChief Accounting OfficerOpen market sell$147K-20.3%$30.78$147KAug 7, 2026Aug 10, 2026
CSGPJohn W. HillDirectorOpen market sell$106K-13.2%$30.21$106KAug 5, 2026Aug 10, 2026
CSGPAndrew C. FloranceFounder and CEOOpen market purchase$2.49M+4.8%$29.89$2.49MAug 4, 2026Aug 5, 2026
CSGPAndrew C. FlorancePresident and CEOOpen market purchase$111K+0.2%$35.82$111KMay 1, 2026May 4, 2026
CSGPAndrew C. FlorancePresident and CEOOpen market purchase$2.4M+4.1%$35.17$2.4MMay 1, 2026May 4, 2026
CSGPLouise S. SamsDirectorOpen market purchase$48.4K+5.2%$48.36$48.4KMar 6, 2026Mar 9, 2026
CSGPG. Saint FrederickPresident, MarketplacesOpen market purchase$907K+7.7%$45.33$907KMar 2, 2026Mar 3, 2026
CSGPRachel C. GlaserDirectorOpen market purchase$44.9K+31.7%$44.94$44.9KMar 2, 2026Mar 3, 2026
CSGPAndrew C. FlorancePresident and CEOOpen market purchase$2.48M+3.6%$44.52$2.48MFeb 27, 2026Mar 2, 2026
CSGPJohn W. HillDirectorOpen market sell$155K-11.0%$68.68$155KNov 13, 2025Nov 17, 2025
CSGPCynthia Cammett CannChief Accounting OfficerOpen market sell$127K-7.4%$68.79$127KNov 13, 2025Nov 17, 2025
End of history · 11 transactions
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