Biggest Insider Buys: September 2025
The largest open-market insider purchases disclosed in SEC Form 4 filings, ranked by dollar value.
In September 2025, 6 open-market insider purchases of $50K or more were disclosed across 4 companies in SEC Form 4 filings, totaling $24.8M. The largest single purchase was $12.0M by Heron Patrick J at MBX Biosciences, Inc. (MBX).
← All monthly rankingsLargest purchases · September 2025
| Source | |||||||
|---|---|---|---|---|---|---|---|
| MBX | Director, 10% Owner | Purchase | 666,666 | $12.0M | Sep 30 | SEC ↗ | |
| GGZ.E | Control Person of Adviser | Purchase | 1,050,000 | $10.5M | Sep 30 | SEC ↗ | |
| OPEN | Director | Purchase | 300,752 | $2.0M | Sep 30 | SEC ↗ | |
| STRR | Chief Executive Officer | Purchase | 12,000 | $131K | Sep 17 | SEC ↗ | |
| STRR | Chief Executive Officer | Purchase | 11,395 | $113K | Sep 17 | SEC ↗ | |
| STRR | Chief Executive Officer | Purchase | 10,402 | $100K | Sep 17 | SEC ↗ |