Septerna, Inc.
A clinical-stage biotechnology company crafting oral small-molecule medicines aimed at G protein-coupled receptors (GPCRs), cell-surface proteins tied to many diseases that have historically been hard to drug. Its scientists use a 'Native Complex Platform' to isolate and study these receptors in a form that mimics the body's cell membranes. Founded in 2019 by Nobel laureate Robert Lefkowitz and colleagues, the company's name blends 'sept,' for the receptors' seven membrane-spanning domains, with 'terna,' from the model he developed for how they work.
| Holder | Schedule | % of class | Shares | Filed |
|---|---|---|---|---|
| RA Capital Management, L.P. | 13D/AActivist | 11.8% | 5.53M | Aug 14, 2026 |
| Peter Kolchinsky | 13D/AActivist | 11.8% | 5.53M | Aug 14, 2026 |
| Rajeev Shah | 13D/AActivist | 11.8% | 5.53M | Aug 14, 2026 |
| RA Capital Healthcare Fund, L.P. | 13D/AActivist | 10.2% | 4.78M | Aug 14, 2026 |
| DRIEHAUS CAPITAL MANAGEMENT LLC | 13G/APassive | 9.83% | 4.43M | Aug 14, 2026 |
| BVF PARTNERS L P/IL | 13G/APassive | 3.8% | 1.72M | Feb 17, 2026 |
| BVF INC/IL | 13G/APassive | 3.8% | 1.72M | Feb 17, 2026 |
| LAMPERT MARK N | 13G/APassive | 3.8% | 1.72M | Feb 17, 2026 |
| BVF GP HOLDINGS LLC | 13G/APassive | 3.6% | 1.59M | Feb 17, 2026 |
| BIOTECHNOLOGY VALUE FUND L P | 13G/APassive | 2% | 919.8K | Feb 17, 2026 |