Companies / CoStar Group Inc / Activity
Activity — CoStar Group Inc
53 moves.
Top impactInsider · CEO movesInsider · biggest buysInsider · biggest sellsInstitution · biggest movesInstitution · new positions
| Date | Actor | Action | Security | Value | Shares Δ | Position after | Impact |
|---|---|---|---|---|---|---|---|
| Jun 23, 2026 | Sams Louise S Director | Grant | Common Stock, par value $0.01 per share | $0 | +8K +40.48% | 28,671 <0.01% of shares | low |
| Jun 23, 2026 | Brunner Angelique G. Director | Grant | Common Stock, par value $0.01 per share | $0 | +8K +81.27% | 18,428 <0.01% of shares | low |
| Jun 23, 2026 | McCarthy Christine M Director | Grant | Common Stock, par value $0.01 per share | $0 | +8K +248.63% | 11,585 <0.01% of shares | low |
| Jun 23, 2026 | Glaser Rachel C Director | Grant | Common Stock, par value $0.01 per share | $0 | +8K +198.75% | 12,419 <0.01% of shares | low |
| Jun 23, 2026 | Berisford John L Director | Grant | Common Stock, par value $0.01 per share | $0 | +8K +277.90% | 11,235 <0.01% of shares | low |
| Jun 23, 2026 | Musslewhite Robert W Director | Grant | Common Stock, par value $0.01 per share | $0 | +8K +45.20% | 26,539 <0.01% of shares | low |
| Jun 23, 2026 | Hill John W Director | Grant | Common Stock, par value $0.01 per share | $0 | +8K +45.32% | 26,493 <0.01% of shares | low |
| Feb 19, 2026 | Ruggles Lisa Executive | Other | Common Stock, par value $0.01 per share | $0 | -18K -8.47% | 190,042 0.05% of shares | low |
| Feb 19, 2026 | Saint Frederick G. Executive | Other | Common Stock, par value $0.01 per share | $0 | -18K -6.05% | 273,096 0.07% of shares | low |
| Feb 19, 2026 | Florance Andrew C CEO | Other | Common Stock, par value $0.01 per share | $0 | -105K -6.34% | 1,550,367 0.38% of shares | low |
| Feb 19, 2026 | Simuro Frank Executive | Other | Common Stock, par value $0.01 per share | $0 | -31K -6.41% | 448,721 0.11% of shares | low |
| Jun 15, 2026 | Cann Cynthia Cammett Executive | Other | Common Stock, par value $0.01 per share | $14.8K | -461 -1.83% | 24,687 <0.01% of shares | low |
| Mar 15, 2026 | Boxer Gene Executive | Other | Common Stock, par value $0.01 per share | $18.7K | -428 -0.45% | 95,517 0.02% of shares | low |
| Mar 15, 2026 | Boxer Gene Executive | Other | Common Stock, par value $0.01 per share | $21.0K | -482 -0.50% | 95,463 0.02% of shares | low |
| Mar 2, 2026 | Glaser Rachel C Director | Buy | Common Stock, par value $0.01 per share | $44.9K | +1K +31.68% | 4,157 <0.01% of shares | low |
| Mar 6, 2026 | Sams Louise S Director | Buy | Common Stock, par value $0.01 per share | $48.4K | +1K +5.15% | 20,409 <0.01% of shares | low |
| Mar 15, 2026 | Cann Cynthia Cammett Executive | Other | Common Stock, par value $0.01 per share | $52.1K | -1K -4.53% | 25,148 <0.01% of shares | low |
| Mar 1, 2026 | Cann Cynthia Cammett Executive | Other | Common Stock, par value $0.01 per share | $61.8K | -1K -5.93% | 21,968 <0.01% of shares | low |
| Feb 19, 2026 | Saint Frederick G. Executive | Other | Common Stock, par value $0.01 per share | $105.5K | -2K -0.79% | 270,947 0.07% of shares | low |
| Feb 15, 2026 | Saint Frederick G. Executive | Other | Common Stock, par value $0.01 per share | $109.1K | -2K -0.83% | 290,679 0.07% of shares | low |
| May 1, 2026 | Florance Andrew C CEO | Buy | Common Stock, par value $0.01 per share | $111.0K | +3K +0.18% | 1,722,865 0.43% of shares | medium |
| Mar 15, 2026 | Desmarais Michael J Executive | Other | Common Stock, par value $0.01 per share | $125.3K | -3K -3.17% | 87,725 0.02% of shares | low |
| Mar 15, 2026 | Ruggles Lisa Executive | Other | Common Stock, par value $0.01 per share | $129.9K | -3K -1.67% | 174,915 0.04% of shares | low |
| Feb 19, 2026 | Ruggles Lisa Executive | Other | Common Stock, par value $0.01 per share | $158.0K | -3K -1.69% | 186,823 0.05% of shares | low |
| Feb 15, 2026 | Ruggles Lisa Executive | Other | Common Stock, par value $0.01 per share | $160.9K | -4K -1.69% | 207,625 0.05% of shares | low |
| Feb 15, 2026 | Simuro Frank Executive | Other | Common Stock, par value $0.01 per share | $186.8K | -4K -0.86% | 479,448 0.12% of shares | low |
| Mar 1, 2026 | Boxer Gene Executive | Other | Common Stock, par value $0.01 per share | $202.9K | -5K -5.79% | 74,025 0.02% of shares | low |
| Feb 19, 2026 | Simuro Frank Executive | Other | Common Stock, par value $0.01 per share | $216.9K | -4K -0.99% | 444,300 0.11% of shares | low |
| Mar 1, 2026 | Desmarais Michael J Executive | Other | Common Stock, par value $0.01 per share | $283.5K | -6K -8.01% | 72,922 0.02% of shares | low |
| Mar 1, 2026 | Lown Christian M. Executive | Other | Common Stock, par value $0.01 per share | $320.2K | -7K -5.51% | 122,982 0.03% of shares | low |
| Mar 1, 2026 | Ruggles Lisa Executive | Other | Common Stock, par value $0.01 per share | $398.6K | -9K -4.78% | 177,892 0.04% of shares | low |
| Mar 15, 2026 | Simuro Frank Executive | Other | Common Stock, par value $0.01 per share | $484.6K | -11K -2.61% | 414,491 0.10% of shares | low |
| Mar 1, 2026 | Saint Frederick G. Executive | Other | Common Stock, par value $0.01 per share | $495.2K | -11K -4.10% | 259,851 0.06% of shares | low |
| Feb 15, 2026 | Florance Andrew C CEO | Other | Common Stock, par value $0.01 per share | $786.5K | -17K -1.05% | 1,655,350 0.41% of shares | low |
| Mar 1, 2026 | Simuro Frank Executive | Other | Common Stock, par value $0.01 per share | $834.7K | -19K -4.21% | 425,598 0.11% of shares | low |
| Mar 2, 2026 | Saint Frederick G. Executive | Buy | Common Stock, par value $0.01 per share | $906.6K | +20K +7.70% | 279,851 0.07% of shares | high |
| Feb 19, 2026 | Florance Andrew C CEO | Other | Common Stock, par value $0.01 per share | $943.2K | -19K -1.24% | 1,531,146 0.38% of shares | low |
| May 1, 2026 | Florance Andrew C CEO | Buy | Common Stock, par value $0.01 per share | $2.40M | +68K +4.14% | 1,719,765 0.42% of shares | high |
| Feb 27, 2026 | Florance Andrew C CEO | Buy | Common Stock, par value $0.01 per share | $2.48M | +56K +3.64% | 1,586,866 0.39% of shares | high |
| Mar 1, 2026 | Florance Andrew C CEO | Other | Common Stock, par value $0.01 per share | $2.66M | -60K -3.76% | 1,527,273 0.38% of shares | low |
| Mar 10, 2026 | Boxer Gene Executive | Grant | Common Stock, par value $0.01 per share | — | +22K +29.61% | 95,945 0.02% of shares | low |
| Feb 27, 2026 | Boxer Gene Executive | Grant | Restricted Stock Units | — | +27K | 26,888 <0.01% of shares | low |
| Feb 27, 2026 | Ruggles Lisa Executive | Grant | Restricted Stock Units | — | +28K | 28,197 <0.01% of shares | low |
| Mar 10, 2026 | Lown Christian M. Executive | Grant | Common Stock, par value $0.01 per share | — | +12K +9.98% | 135,250 0.03% of shares | low |
| Feb 27, 2026 | Lown Christian M. Executive | Grant | Restricted Stock Units | — | +40K | 39,652 <0.01% of shares | low |
| Feb 27, 2026 | Saint Frederick G. Executive | Grant | Restricted Stock Units | — | +40K | 39,652 <0.01% of shares | low |
| Mar 10, 2026 | Cann Cynthia Cammett Executive | Grant | Common Stock, par value $0.01 per share | — | +4K +19.91% | 26,342 <0.01% of shares | low |
| Feb 27, 2026 | Cann Cynthia Cammett Executive | Grant | Restricted Stock Units | — | +7K | 6,834 <0.01% of shares | low |
| Mar 10, 2026 | Florance Andrew C CEO | Grant | Common Stock, par value $0.01 per share | — | +124K +8.13% | 1,651,435 0.41% of shares | low |
| Feb 27, 2026 | Florance Andrew C CEO | Grant | Restricted Stock Units | — | +84K | 83,708 0.02% of shares | low |