Who holds it, who is betting against it, and where the big money is moving
Net of large-order buying minus selling, in USD. Over this window: −$853.9K (8 inflow days, 12 outflow days).
Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.
The five largest holders on file together own 59.5% of shares outstanding.
Reported short interest has risen from 0.22% to 0.68% of float over the last 3 biweekly reports (14 Aug 2026 to 15 Sep 2026).
| Holder | Type | Period | Share change | New stake |
|---|---|---|---|---|
| Vanguard Capital Management, LLC | Mutual Fund | 2026/Q3 | +67,364 | 0.1% |
| Vanguard Portfolio Management, LLC | Mutual Fund | 2026/Q3 | +1,074 | 0.0% |
| Deep Track Capital, LP | VC/PE Fund | 2026/Q3 | +4,446,656 | 6.7% |
| Leonard Blavatnik | Individual/Insider | 2026/Q3 | +3,185,177 | 4.8% |
| Westlake Village BioPartners | VC/PE Fund | 2026/Q3 | +13,199,669 | 19.9% |
| Foresite Capital Management, LLC | VC/PE Fund | 2026/Q3 | +9,181,328 | 13.8% |
| 5AM Venture Management, LLC | VC/PE Fund | 2026/Q3 | +7,325,962 | 11.0% |
| RA Capital Management, L.P. | VC/PE Fund | 2026/Q3 | +5,295,690 | 8.0% |
| Sanofi | Public Company | 2026/Q3 | +672,788 | 1.0% |
| Blue Owl Credit Private Fund Advisors LLC | Hedge Fund | 2026/Q3 | +3,146,780 | 4.7% |
| Neil Singla | Individual/Insider | 2026/Q3 | +532,795 | 0.8% |
| Timothy Walbert | Individual/Insider | 2026/Q3 | +329,819 | 0.5% |
| Timothy Lugo | Individual/Insider | 2026/Q3 | +166,354 | 0.3% |
| Farzan Trust | Private Company | 2026/Q3 | +114,453 | 0.2% |
| Sara Bonstein | Individual/Insider | 2026/Q3 | +105,542 | 0.2% |
Institutional buy/sell activity by reporting period, largest moves first.
| Date | Insider | Title | Transaction | Shares | Price | Held after |
|---|---|---|---|---|---|---|
| 9 Aug 2026 | Sanofi | Derivative Exercise and Retained | +672,778 | – | 672,788 | |
| 9 Aug 2026 | 5AM Venture Management, LLC | Derivative Exercise and Retained | +7,325,962 | – | 7,325,962 | |
| 9 Aug 2026 | Foresite Capital Management, LLC | Open Market Acquisition | +140,000 | $18.00 | 9,181,328 | |
| 9 Aug 2026 | Foresite Capital Management, LLC | Derivative Exercise and Retained | +9,041,328 | – | 9,181,328 | |
| 9 Aug 2026 | Westlake Village BioPartners | Derivative Exercise and Retained | +12,695,305 | – | 13,199,669 | |
| 5 Aug 2026 | James Tananbaum | Independent Director | Initial Statement of Beneficial | +0 | – | 1,484,401 |
| 5 Aug 2026 | Sanofi | Initial Statement of Beneficial | +0 | – | 494,800 | |
| 5 Aug 2026 | Andrew Schwab | Initial Statement of Beneficial | +0 | – | 1,484,401 | |
| 5 Aug 2026 | Timothy Walbert | Independent Chairperson | Initial Statement of Beneficial | +0 | – | 329,819 |
| 5 Aug 2026 | Todd Smith | Independent Director | Other Derivative Acquisition | +105,542 | $18.00 | 105,542 |
| 5 Aug 2026 | Nima Farzan | Chief Executive Officer | Initial Statement of Beneficial | +0 | – | 2,787,966 |
| 5 Aug 2026 | Sara Bonstein | Independent Director | Initial Statement of Beneficial | +0 | – | 105,542 |
| 5 Aug 2026 | Westlake Village BioPartners | Initial Statement of Beneficial | +0 | – | 679,620 | |
| 5 Aug 2026 | Neha Krishnamohan | Chief Business Officer & CFO | Initial Statement of Beneficial | +0 | – | 686,026 |
From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.
| Report date | Shares short | % of float | Days to cover |
|---|---|---|---|
| 15 Sep 2026 | 449,962 | 0.7% | 2.1 |
| 31 Aug 2026 | 308,625 | 0.5% | 1.7 |
| 14 Aug 2026 | 134,468 | 0.2% | 1.0 |
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