Form4.ai tracks every SEC insider trade in real time. See every CSGP insider filing with a free account — no card.
See every CSGP insider filing — free account, no card.
Free accountCOSTAR GROUP, INC. (CSGP) has 3 SEC Form 4 insider filings on record in the last 90 days. No insider purchases were filed — 2 sales totalling $253K. Most recent filing: Oct. 16, 2026.
Open-market value, last 90 days
Form 4 filings by type, last 90 days
| Date | Insider | Trade | Value | Price since buy |
|---|---|---|---|---|
| Oct 16, 2026 SEC filing | Rossmann Robin Jack Chief Financial Officer | Tax withholding | $24,192 | — |
| Aug 10, 2026 SEC filing | Cann Cynthia Cammett Chief Accounting Officer | Sold | $147,375 | — |
| Aug 10, 2026 SEC filing | Hill John W Director | Sold | $105,735 | — |
Create a free account to see all 3 CSGP filings from the last 90 days. No card needed.
Create free accountWant CSGP insider buys the moment they're filed, with Telegram alerts? Try Pro free for 7 days
Form 4 is the filing company officers, directors and 10% shareholders must submit to the SEC within two business days of trading their own company's stock. Open-market purchases generally carry more signal than sales, which are often scheduled in advance. More on how this works.