MBX: MBX Biosciences, Inc. insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
0 open-market buys totaling - and 0 sales totaling - in the last 180 days.
Activist and 5% holders
| Filed | What | Holder | Stake | Change | Filing |
|---|---|---|---|---|---|
| 2026-08-14 | Fell below 5% | Deep Track Capital, LP | 3.64% | SEC | |
| 2026-08-10 | 13D amendment | Frazier Life Sciences Public Fund, L.P. | 11.70% | SEC | |
| 2026-08-10 | 13D amendment | ORBIMED ADVISORS LLC | 6.40% | SEC |
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