Anaptysbio, Inc has 12 Schedule 13D or 13G filings on record since 2025-07-29. 1 holder's latest filing reports 5% or more of common stock, par value $0.001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Sirenia Capital Management LP | 5% | 1,491,959 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| The Goldman Sachs Group, Inc. | 4.5% | 1,251,295 | SCHEDULE 13G/A, 2025-11-12 | 2025-09-30 |
| Morgan Stanley | 3.6% | 1,006,063 | SCHEDULE 13G/A, 2026-02-11 | 2025-12-31 |
| Mathew P. Arens | 3.12% | 864,618 | SCHEDULE 13G/A, 2025-11-14 | 2025-09-30 |
| Millennium Management LLC | 2.9% | 813,571 | SCHEDULE 13G/A, 2026-01-16 | 2025-12-31 |
| Point72 Asset Management, L.P. | 0.2% | 55,303 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-29 | The Vanguard Group | 5.23% | SCHEDULE 13G |
| 2025-08-05 | Morgan Stanley | 6.3% | SCHEDULE 13G |
| 2025-08-07 | Mathew P. Arens | 7.71% | SCHEDULE 13G/A |
| 2025-09-23 | Millennium Management LLC | 5.1% | SCHEDULE 13G |
| 2025-11-12 | The Goldman Sachs Group, Inc. | 4.5% | SCHEDULE 13G/A |
| 2025-11-14 | Mathew P. Arens | 3.12% | SCHEDULE 13G/A |
| 2026-01-16 | Millennium Management LLC | 2.9% | SCHEDULE 13G/A |
| 2026-02-11 | Morgan Stanley | 3.6% | SCHEDULE 13G/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-05-15 | Sirenia Capital Management LP | 6.7% | SCHEDULE 13G |
| 2026-05-15 | Point72 Asset Management, L.P. | 0.2% | SCHEDULE 13G/A |
| 2026-08-14 | Sirenia Capital Management LP | 5% | 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.