Equillium Inc. has 11 Schedule 13D or 13G filings on record since 2025-11-13. 8 holders' latest filing reports 5% or more of common stock, par value $0.0001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Janus Henderson Group Plc | 9.99% | 6,083,239 | SCHEDULE 13G/A, 2026-02-06 | 2026-01-30 |
| ADAR1 Capital Management, LLC | 9.9% | 6,603,754 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| RA Capital Management, L.P. | 9.9% | 6,480,209 | SCHEDULE 13G, 2026-03-20 | 2026-03-13 |
| Xiangmin Cui | 8.9% | 5,733,021 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| Adage Capital Management, L.P. | 7.25% | 4,832,767 | SCHEDULE 13G/A, 2026-08-12 | 2026-06-30 |
| Affinity Asset Advisors, LLC | 6.5% | 4,100,000 | SCHEDULE 13G, 2026-08-13 | 2026-06-30 |
| Woodline Partners LP | 5.9% | 3,508,771 | SCHEDULE 13G, 2025-11-14 | 2025-09-30 |
| Aberdeen Group plc | 5.3% | 3,352,837 | SCHEDULE 13G, 2026-05-07 | 2026-04-01 |
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-11-13 | Adage Capital Management, L.P. | 9.99% | SCHEDULE 13G |
| 2025-11-14 | Woodline Partners LP | 5.9% | SCHEDULE 13G |
| 2025-11-14 | ADAR1 Capital Management, LLC | 9.9% | SCHEDULE 13G |
| 2025-12-08 | Janus Henderson Group Plc | 9.99% | SCHEDULE 13G |
| 2026-02-06 | Janus Henderson Group Plc | 9.99% | SCHEDULE 13G/A |
| 2026-03-20 | RA Capital Management, L.P. | 9.9% | SCHEDULE 13G |
| 2026-05-07 | Aberdeen Group plc | 5.3% | SCHEDULE 13G |
| 2026-05-15 | ADAR1 Capital Management, LLC | 9.9% | SCHEDULE 13G/A |
| 2026-05-15 | Xiangmin Cui | 8.9% | SCHEDULE 13G/A |
| 2026-08-12 | Adage Capital Management, L.P. | 7.25% | SCHEDULE 13G/A |
| 2026-08-13 | Affinity Asset Advisors, LLC | 6.5% | SCHEDULE 13G |
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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.