Biggest Insider Buys: October 2025
The largest open-market insider purchases disclosed in SEC Form 4 filings, ranked by dollar value.
In October 2025, 33 open-market insider purchases of $50K or more were disclosed across 27 companies in SEC Form 4 filings, totaling $36.3M. The largest single purchase was $16.2M by Novo Holdings A/S at MapLight Therapeutics, Inc. (MPLT).
← All monthly rankingsLargest purchases · October 2025
| Source | |||||||
|---|---|---|---|---|---|---|---|
| MPLT | 10% Owner | Purchase | 952,941 | $16.2M | Oct 30 | SEC ↗ | |
| EG | Director | Purchase | 11,385 | $3.5M | Oct 30 | SEC ↗ | |
| AMRZ | Chairman & CEO | Purchase | 55,000 | $2.9M | Oct 31 | SEC ↗ | |
| CLS | Director | Purchase | 6,000 | $2.1M | Oct 30 | SEC ↗ | |
| BAH | President and CEO | Purchase | 23,800 | $2.0M | Oct 30 | SEC ↗ | |
| BX | Director | Purchase | 13,170 | $2.0M | Oct 31 | SEC ↗ | |
| CGEM | 10% Owner | Purchase | 165,667 | $1.4M | Oct 30 | SEC ↗ | |
| AVTR | Director | Purchase | 100,000 | $1.1M | Oct 31 | SEC ↗ | |
| EG | Director | Purchase | 3,100 | $949K | Oct 30 | SEC ↗ | |
| SON | CFO | Purchase | 20,500 | $810K | Oct 30 | SEC ↗ | |
| ASA | 10% Owner | Purchase | 12,847 | $582K | Oct 30 | SEC ↗ | |
| ASA | 10% Owner | Purchase | 9,128 | $414K | Oct 30 | SEC ↗ | |
| WAL | Vice Chairman and CFO | Purchase | 4,000 | $308K | Oct 30 | SEC ↗ | |
| OPK | CEO & Chairman | Purchase | 150,000 | $213K | Oct 31 | SEC ↗ | |
| ITGR | President & CEO | Purchase | 3,127 | $203K | Oct 30 | SEC ↗ | |
| GAM | Chairman | Purchase | 7,394 | $185K | Oct 30 | SEC ↗ | |
| AFB | Director | Purchase | 13,500 | $150K | Oct 31 | SEC ↗ | |
| CHMG | Director | Purchase | 2,184 | $113K | Oct 30 | SEC ↗ | |
| TCBI | Director | Purchase | 5,000 | $104K | Oct 30 | SEC ↗ | |
| WDFC | Director | Purchase | 523 | $103K | Oct 30 | SEC ↗ | |
| UTG | Insider | Purchase | 2,700 | $102K | Oct 27 | SEC ↗ | |
| WSBC | Director | Purchase | 3,321.156 | $100K | Oct 31 | SEC ↗ | |
| SON | Director | Purchase | 2,506 | $100K | Oct 30 | SEC ↗ | |
| WDFC | Director | Purchase | 500 | $97K | Oct 30 | SEC ↗ | |
| GAM | Chairman | Purchase | 3,811 | $95K | Oct 30 | SEC ↗ |