CSGP CoStar Group, Inc.
CoStar Group, Inc. (CSGP) Insider Activity
What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.
How much of that selling was preplanned? 0% planned / 100% discretionary
Largest single sale: $154.5K.
Where they traded
Last open-market purchase: August 4, 2026 , by FLORANCE ANDREW C .
Recent open-market activity
| Date | Insider | Role | Action | Shares | Price | Value | Held after |
|---|---|---|---|---|---|---|---|
| Cann Cynthia Cammett | Chief Accounting Officer | Sell | 4,788 | $30.78 | $147.4K | 18,822 −20.3% of holding | |
| Hill John W | Director | Sell | 3,500 | $30.21 | $105.7K | 22,993 −13.2% of holding | |
| FLORANCE ANDREW C | Founder and CEO | Buy | 83,300 | $29.89 | $2.5M | 1,806,165 | |
| FLORANCE ANDREW C 2 fills | President and CEO | Buy | 71,430 | $35.20 | $2.5M | 1,722,865 | |
| Sams Louise S | Director | Buy | 1,000 | $48.36 | $48.4K | 20,409 | |
| SAINT FREDERICK G. | President, Marketplaces | Buy | 20,000 | $45.33 | $906.6K | 279,851 | |
| Glaser Rachel C | Director | Buy | 1,000 | $44.94 | $44.9K | 4,157 | |
| FLORANCE ANDREW C | President and CEO | Buy | 55,720 | $44.52 | $2.5M | 1,586,866 | |
| Hill John W | Director | Sell | 2,250 | $68.68 | $154.5K | 18,231 −11% of holding | |
| Cann Cynthia Cammett | Chief Accounting Officer | Sell | 1,841 | $68.79 | $126.6K | 23,211 −7.3% of holding |
Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.