As of November 6, 2026, 8 holders' latest Schedule 13D or 13G filings report owning 5% or more of Equillium, Inc. The largest reported stake is Janus Henderson Group Plc's, at 9.99%. 12 filings are on record since November 13, 2025 (Schedule 13G/A, February 6, 2026).
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Key facts
- · Reporting person: Aberdeen Group plc · Sole voting: 0 · Shared voting: 4,458,351 · Sole dispositive: 0 · Shared dispositive: 4,458,351 · SCHEDULE 13G/A, 2026-11-04
- · Reporting person: Affinity Asset Advisors, LLC · Sole voting: 4,100,000 · Shared voting: 0 · Sole dispositive: 4,100,000 · Shared dispositive: 0 · SCHEDULE 13G, 2026-08-13
- · Reporting person: Adage Capital Management, L.P. · Sole voting: 0 · Shared voting: 4,832,767 · Sole dispositive: 0 · Shared dispositive: 4,832,767 · SCHEDULE 13G/A, 2026-08-12
- · Holder: ADAR1 Capital Management, LLC · Percent: 9.9% · SCHEDULE 13G/A
- · Holder: Xiangmin Cui · Percent: 8.9% · SCHEDULE 13G/A
Equillium, Inc. has 12 Schedule 13D or 13G filings on record since 2025-11-13. 8 holders' latest filing reports 5% or more of common stock, $0.0001 par value. 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 |
| 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 |
| Aberdeen Group plc | 7.03% | 4,458,351 | SCHEDULE 13G/A, 2026-11-04 | 2026-09-30 |
| 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 |
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More on Equillium, Inc. and the records around it.
Equillium, Inc. elsewhere on the record
Companies that share a holder
- Aberdeen Group plc also filed stake reports on 12 other companies: IMMUNIC, INC (Nov 2026), CODEXIS, INC. (Oct 2026), Corbus Pharmaceuticals Holdings, Inc. (Oct 2026)
- Affinity Asset Advisors, LLC also filed stake reports on 13 other companies: Amanat Acquisition Corp. (Aug 2026), Avalo Therapeutics, Inc. (Aug 2026), First Tracks Biotherapeutics, Inc (Aug 2026)
- Woodline Partners LP also filed stake reports on 19 other companies: Biohaven Ltd. (Aug 2026), Black Rock Coffee Bar, Inc. (Aug 2026), CalciMedica, Inc. (Aug 2026)
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What the Full Report on Equillium, Inc. covers
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Adage Capital Management, L.P. | 0 | 4,832,767 | 0 | 4,832,767 | SCHEDULE 13G/A, 2026-08-12 |
| Robert Atchinson | 0 | 4,832,767 | 0 | 4,832,767 | SCHEDULE 13G/A, 2026-08-12 |
| Phillip Gross | 0 | 4,832,767 | 0 | 4,832,767 | SCHEDULE 13G/A, 2026-08-12 |
| Aberdeen Group plc | 0 | 4,458,351 | 0 | 4,458,351 | SCHEDULE 13G/A, 2026-11-04 |
| abrdn Inc. | 0 | 4,458,351 | 0 | 4,458,351 | SCHEDULE 13G/A, 2026-11-04 |
| Affinity Asset Advisors, LLC | 4,100,000 | 0 | 4,100,000 | 0 | SCHEDULE 13G, 2026-08-13 |
| Michael Cho | 4,100,000 | 0 | 4,100,000 | 0 | SCHEDULE 13G, 2026-08-13 |
The latest filing identifies Equillium, Inc. by CUSIP 29446K106 and gives its principal executive office as 2223 AVENIDA DE LA PLAYA, SUITE 105, LA JOLLA, CALIFORNIA, CA 92037 (SCHEDULE 13G/A, 2026-11-04).
What the percentages are based on
As of June 30, 2026, the Reporting Persons beneficially own approximately 6.5% of the Common Stock outstanding. The percentages disclosed above are based on 63,226,556 shares of Common Stock of the Issuer outstanding as of May 8, 2026, as set forth in the Issuer's Form 10-Q filed with the Securities and Exchange Commission on May 13, 2026.Affinity Asset Advisors, LLC, SCHEDULE 13G, 2026-08-13
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 |
| 2026-11-04 | Aberdeen Group plc | 7.03% | SCHEDULE 13G/A |
Questions about who owns Equillium, Inc.
Who owns Equillium, Inc.?
On this page, 8 holders' latest ownership filings report 5% or more of Equillium, Inc.: Janus Henderson Group Plc (9.99%, Schedule 13G/A, filed 2026-02-06), ADAR1 Capital Management, LLC (9.9%, Schedule 13G/A, filed 2026-05-15), RA Capital Management, L.P. (9.9%, Schedule 13G, filed 2026-03-20), Xiangmin Cui (8.9%, Schedule 13G/A, filed 2026-05-15) and Adage Capital Management, L.P. (7.25%, Schedule 13G/A, filed 2026-08-12); 3 more are listed above.
Who are the largest shareholders of Equillium, Inc.?
By the share each holder's latest filing reports, the largest holders of Equillium, Inc. on this page are Janus Henderson Group Plc (9.99%), ADAR1 Capital Management, LLC (9.9%) and RA Capital Management, L.P. (9.9%).
When did Janus Henderson Group Plc buy into Equillium, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Janus Henderson Group Plc on this page is the Schedule 13G, filed 2025-12-08, reporting 9.99%; its latest, Schedule 13G/A filed 2026-02-06, reports 9.99%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 12 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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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.