Activist & passive stakes
Investors crossing the 5% ownership line, from SEC Schedule 13D (activist) and 13G (passive) filings. Newest first.
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New filings only, amendments hidden. Show all filings →1–3 of 3
- ActivistNewNov 10, 2026ARCH Venture Fund X, L.P.12.9% · 3,754,922 shSEC
- ActivistNewNov 6, 2026Orbimed Advisors Llc12.3% · 3,589,132 shSEC
- PassiveNewNov 6, 2026Fmr Llc11.2% · 3,250,000 shSEC
| Filing | Symbol | Holder | % Owned | Shares | Filed | SEC filing |
|---|---|---|---|---|---|---|
ActivistNew | ASPE | ARCH Venture Fund X, L.P. in Aspen Neuroscience, Inc. | 12.9% | 3,754,922 | Nov 10, 2026 | SEC |
ActivistNew | ASPE | Orbimed Advisors Llc in Aspen Neuroscience, Inc. | 12.3% | 3,589,132 | Nov 6, 2026 | SEC |
PassiveNew | ASPE | Fmr Llc in Aspen Neuroscience Inc | 11.2% | 3,250,000 | Nov 6, 2026 | SEC |