Alto Neuroscience, Inc. has 20 Schedule 13D or 13G filings on record since 2025-07-16. 5 holders' latest filing reports 5% or more of common stock, $0.0001 par value per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Perceptive Advisors LLC | 9.99% | 4,176,711 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| Commodore Capital LP | 9.9% | 3,588,180 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| Sirenia Capital Management LP | 6.2% | 2,219,568 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| BlackRock, Inc. | 6% | 2,104,406 | SCHEDULE 13G, 2026-07-27 | 2026-06-30 |
| EcoR1 Capital, LLC | 5.8% | 2,232,000 | SCHEDULE 13G, 2026-07-20 | 2026-07-13 |
| Armistice Capital, LLC | 4.94% | 1,536,000 | SCHEDULE 13G/A, 2026-02-18 | 2025-12-31 |
| Steven A. Cohen | 3.7% | 1,170,865 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| K2 HealthVentures Equity Trust LLC | 2.4% | 788,995 | SCHEDULE 13G/A, 2026-02-17 | 2025-12-31 |
| Vestal Point Capital, LP | 2.2% | 785,000 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-16 | BlackRock, Inc. | 2.1% | SCHEDULE 13G/A |
| 2025-08-14 | Armistice Capital, LLC | 6% | SCHEDULE 13G/A |
| 2025-10-10 | Perceptive Advisors LLC | 7.3% | SCHEDULE 13G |
| 2025-10-27 | Commodore Capital LP | 9.8% | SCHEDULE 13G |
| 2026-02-17 | Vestal Point Capital, LP | 8% | SCHEDULE 13G |
| 2026-02-17 | Steven A. Cohen | 8.9% | SCHEDULE 13G/A |
| 2026-02-17 | K2 HealthVentures Equity Trust LLC | 2.4% | SCHEDULE 13G/A |
| 2026-02-17 | Armistice Capital, LLC | 6% | SCHEDULE 13G/A |
| 2026-02-17 | Perceptive Advisors LLC | 9.99% | SCHEDULE 13G/A |
| 2026-02-17 | Commodore Capital LP | 9.9% | SCHEDULE 13G/A |
| 2026-02-18 | Armistice Capital, LLC | 4.94% | SCHEDULE 13G/A |
| 2026-05-15 | Vestal Point Capital, LP | 6.5% | SCHEDULE 13G/A |
| 2026-05-15 | Sirenia Capital Management LP | 7.9% | SCHEDULE 13G |
| 2026-05-15 | Steven A. Cohen | 3.7% | SCHEDULE 13G/A |
| 2026-05-15 | Commodore Capital LP | 9.9% | SCHEDULE 13G/A |
| 2026-07-20 | EcoR1 Capital, LLC | 5.8% | SCHEDULE 13G |
| 2026-07-27 | BlackRock, Inc. | 6% | SCHEDULE 13G |
| 2026-08-14 | Vestal Point Capital, LP | 2.2% | SCHEDULE 13G/A |
| 2026-08-14 | Sirenia Capital Management LP | 6.2% | SCHEDULE 13G/A |
| 2026-08-14 | Perceptive Advisors LLC | 9.99% | SCHEDULE 13G/A |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.