CMPX insider buying and SEC filings, explained
Compass Therapeutics, Inc. · CIK 1738021
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$94K
Insiders who bought
2
Sold (not marked 10b5-1)
$0
Planned sales (10b5-1)
$0
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Oct 1, 2026 | Purchase (code P) | Neil Lerner (Chief Accounting Officer) bought 20,000 shares at $0.9200 ($18K), reported as a purchase (code P). Holdings up 5% to 420,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Oct 2, 2026, 8:00 AM ET |
| Sep 24, 2026 | Purchase (code P) | Neil Lerner (Chief Accounting Officer) bought 2,500 shares at $1.14 ($3K), reported as a purchase (code P). Holdings up 1% to 400,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 25, 2026 |
| Apr 29, 2026 | Open-market purchase Amended filing | Neil Lerner (Chief Accounting Officer) bought 15,000 shares at $1.89 ($28K) in an open-market purchase. Holdings up 4% to 397,500 shares. Not marked as a 10b5-1 plan trade. This amends a filing from Apr 29. | SEC filing Filed Apr 30, 2026 |
| Apr 29, 2026 | Open-market purchase Amended filing | Jonathan Anderman (General Counsel) bought 25,000 shares at $1.89 ($47K) in an open-market purchase. Holdings up 15% to 196,000 shares. Not marked as a 10b5-1 plan trade. This amends a filing from Apr 29. | SEC filing Filed Apr 30, 2026 |
17 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
2 insiders bought in 30 days
$76K in purchases since Apr 29, 2026 · Purchases traded Apr 29, 2026 to Apr 29, 2026 · Closed
| Insider | Value | Traded | Source |
|---|---|---|---|
| Jonathan Anderman (General Counsel) | $47K | Apr 29, 2026 | SEC filing |
| Neil Lerner (Chief Accounting Officer) | $28K | Apr 29, 2026 | SEC filing |
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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