Form4.ai tracks every SEC insider trade in real time. See every CMPX insider filing with a free account — no card.
See every CMPX insider filing — free account, no card.
Free accountCompass Therapeutics, Inc. (CMPX) has 2 SEC Form 4 insider filings on record in the last 90 days. That includes 2 insider purchases totalling $21K. Most recent filing: Oct. 2, 2026.
Open-market value, last 90 days
Form 4 filings by type, last 90 days
| Date | Insider | Trade | Value | Price since buy |
|---|---|---|---|---|
| Oct 2, 2026 SEC filing | Lerner Neil Chief Accounting Officer | Bought | $18,400 | -14.5% 30D |
| Sep 25, 2026 SEC filing | Lerner Neil Chief Accounting Officer | Bought | $2,850 | -33.3% 30D |
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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.