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CoStar Group Inc

All insider transactions

45 transactions

Date ↓MoveSecurityInsiderΔ sharesPriceValueHeld afterImpact
Jun 23, 2026Other
Grant / award ⓘ
Common Stock, par value $0.01 pe…Sams Louise S
Director
+8,262$0.00$028,671low
Jun 23, 2026Other
Grant / award ⓘ
Common Stock, par value $0.01 pe…Brunner Angelique G.
Director
+8,262$0.00$018,428low
Jun 23, 2026Other
Grant / award ⓘ
Common Stock, par value $0.01 pe…McCarthy Christine M
Director
+8,262$0.00$011,585low
Jun 23, 2026Other
Grant / award ⓘ
Common Stock, par value $0.01 pe…Glaser Rachel C
Director
+8,262$0.00$012,419low
Jun 23, 2026Other
Grant / award ⓘ
Common Stock, par value $0.01 pe…BERISFORD JOHN L
Director
+8,262$0.00$011,235low
Jun 23, 2026Other
Grant / award ⓘ
Common Stock, par value $0.01 pe…Musslewhite Robert W
Director
+8,262$0.00$026,539low
Jun 23, 2026Other
Grant / award ⓘ
Common Stock, par value $0.01 pe…Hill John W
Director
+8,262$0.00$026,493low
Jun 15, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…Cann Cynthia Cammett
Executive
-461$32.04$14.8K24,687low
May 1, 2026Buy
ⓘ
Common Stock, par value $0.01 pe…FLORANCE ANDREW C
CEO
+3,100$35.82$111.0K1,722,865medium
May 1, 2026Buy
ⓘ
Common Stock, par value $0.01 pe…FLORANCE ANDREW C
CEO
+68,330$35.17$2.40M1,719,765high
Mar 15, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…Boxer Gene
Executive
-428$43.63$18.7K95,517low
Mar 15, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…Boxer Gene
Executive
-482$43.63$21.0K95,463low
Mar 15, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…Ruggles Lisa
Executive
-2,977$43.63$129.9K174,915low
Mar 15, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…Cann Cynthia Cammett
Executive
-1,194$43.63$52.1K25,148low
Mar 15, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…SIMURO FRANK
Executive
-11,107$43.63$484.6K414,491low
Mar 15, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…DESMARAIS MICHAEL J
Executive
-2,873$43.63$125.3K87,725low
Mar 10, 2026Other
Grant / award
Common Stock, par value $0.01 pe…Boxer Gene
Executive
+21,920——95,945low
Mar 10, 2026Other
Grant / award
Common Stock, par value $0.01 pe…LOWN CHRISTIAN M.
Executive
+12,268——135,250low
Mar 10, 2026Other
Grant / award
Common Stock, par value $0.01 pe…Cann Cynthia Cammett
Executive
+4,374——26,342low
Mar 10, 2026Other
Grant / award
Common Stock, par value $0.01 pe…FLORANCE ANDREW C
CEO
+124,162——1,651,435low
Mar 10, 2026Other
Grant / award
Common Stock, par value $0.01 pe…DESMARAIS MICHAEL J
Executive
+17,676——90,598low
Mar 6, 2026BuyCommon Stock, par value $0.01 pe…Sams Louise S
Director
+1,000$48.36$48.4K20,409low
Mar 2, 2026BuyCommon Stock, par value $0.01 pe…SAINT FREDERICK G.
Executive
+20,000$45.33$906.6K279,851high
Mar 2, 2026BuyCommon Stock, par value $0.01 pe…Glaser Rachel C
Director
+1,000$44.94$44.9K4,157low
Mar 1, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…Boxer Gene
Executive
-4,547$44.63$202.9K74,025low
Mar 1, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…Ruggles Lisa
Executive
-8,931$44.63$398.6K177,892low
Mar 1, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…LOWN CHRISTIAN M.
Executive
-7,175$44.63$320.2K122,982low
Mar 1, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…SAINT FREDERICK G.
Executive
-11,096$44.63$495.2K259,851low
Mar 1, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…Cann Cynthia Cammett
Executive
-1,385$44.63$61.8K21,968low
Mar 1, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…FLORANCE ANDREW C
CEO
-59,593$44.63$2.66M1,527,273low
Mar 1, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…SIMURO FRANK
Executive
-18,702$44.63$834.7K425,598low
Mar 1, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…DESMARAIS MICHAEL J
Executive
-6,353$44.63$283.5K72,922low
Feb 27, 2026BuyCommon Stock, par value $0.01 pe…FLORANCE ANDREW C
CEO
+55,720$44.52$2.48M1,586,866high
Feb 19, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…Ruggles Lisa
Executive
-3,219$49.07$158.0K186,823low
Feb 19, 2026Other
Disposition to issuer
Common Stock, par value $0.01 pe…Ruggles Lisa
Executive
-17,583$0.00$0190,042low
Feb 19, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…SAINT FREDERICK G.
Executive
-2,149$49.07$105.5K270,947low
Feb 19, 2026Other
Disposition to issuer
Common Stock, par value $0.01 pe…SAINT FREDERICK G.
Executive
-17,583$0.00$0273,096low
Feb 19, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…FLORANCE ANDREW C
CEO
-19,221$49.07$943.2K1,531,146low
Feb 19, 2026Other
Disposition to issuer
Common Stock, par value $0.01 pe…FLORANCE ANDREW C
CEO
-104,983$0.00$01,550,367low
Feb 19, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…SIMURO FRANK
Executive
-4,421$49.07$216.9K444,300low
Feb 19, 2026Other
Disposition to issuer
Common Stock, par value $0.01 pe…SIMURO FRANK
Executive
-30,727$0.00$0448,721low
Feb 15, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…Ruggles Lisa
Executive
-3,576$44.99$160.9K207,625low
Feb 15, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…SAINT FREDERICK G.
Executive
-2,424$44.99$109.1K290,679low
Feb 15, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…FLORANCE ANDREW C
CEO
-17,482$44.99$786.5K1,655,350low
Feb 15, 2026Other
Tax withholding
Common Stock, par value $0.01 pe…SIMURO FRANK
Executive
-4,151$44.99$186.8K479,448low
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