As of November 6, 2026, Rallybio Corp is a publicly traded company (Nasdaq: RLYB); its largest reported holder is ADAR1 Capital, with 17.5% on Schedule 13G of June 5, 2026, then Fidelity (FMR) (15%) (Schedule 13G, June 5, 2026).
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Is Rallybio Corp a real, registered company?
- Rallybio Corp files with the SEC under CIK 1739410 (its SEC filings).
- Its shares are listed under the ticker RLYB on Nasdaq (SEC company record).
- Incorporated in Delaware; business address in New Haven, Connecticut, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under Rallybio Corp in our court records and SEC 8-K records (as of 2026-11-06).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Fidelity (FMR) (filed 2026-08-06).
Who are Rallybio Corp's owners and officers?
Rallybio Corp: incorporated in Delaware; business address in New Haven, Connecticut; industry Pharmaceutical Preparations (Schedule 13G/A, 2026-08-14).
Officers and directors, each with the role and the filing that names them:
- : Executive Officer, Director (Form D, 2024-04-22)
- : Executive Officer (Form D, 2024-04-22)
- : Director (Form D, 2024-04-22)
- : Director (Form D, 2024-04-22)
- : Director (Form D, 2024-04-22)
- : Director (Form D, 2024-04-22)
- : Director (Form D, 2024-04-22)
- : Director (Form D, 2024-04-22)
- : Director (Form D, 2024-04-22)
- : Director (Form D, 2024-04-22)
- : Director (Form D, 2024-04-22)
- : Director (Form D, 2024-04-22)
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-08-14 | Nantahala Capital Management, LLC | 3.56% |
| Schedule 13G/A, 2026-08-14 | Balyasny Asset Management L.P. | 0% |
| Schedule 13G/A, 2026-08-14 | Cormorant Asset Management, LP | 0% |
| Schedule 13G/A, 2026-08-06 | Fmr LLC | 15% |
| Schedule 13G/A, 2026-08-04 | Laurion Capital Management LP | 0% |
| Schedule 13G, 2026-06-05 | Adar1 Capital Management, LLC | 17.5% |
| Schedule 13G, 2026-05-15 | Balyasny Asset Management L.P. | 7.12% |
| Schedule 13G/A, 2026-05-15 | Viking Global Investors LP | 9.99% |
| Schedule 13G, 2026-05-15 | Cormorant Asset Management, LP | 7.56% |
| Schedule 13G, 2026-05-15 | Nantahala Capital Management, LLC | 5.68% |
| Schedule 13D/A, 2026-05-06 | 5am Ventures V, L.P. | 0% |
| Schedule 13G, 2026-04-29 | Laurion Capital Management LP | 5.72% |
Questions about who owns Rallybio Corp
Who owns Rallybio Corp?
On this page, 3 holders' latest ownership filings report 5% or more of Rallybio Corp: Adar1 Capital Management, LLC (17.5%, Schedule 13G, filed 2026-06-05), Fmr LLC (15%, Schedule 13G/A, filed 2026-08-06) and Viking Global Investors LP (9.99%, Schedule 13G/A, filed 2026-05-15).
Who are the largest shareholders of Rallybio Corp?
By the share each holder's latest filing reports, the largest holders of Rallybio Corp on this page are Adar1 Capital Management, LLC (17.5%), Fmr LLC (15%) and Viking Global Investors LP (9.99%).
When did Adar1 Capital Management, LLC buy into Rallybio Corp?
The filings give report dates, not purchase dates. The earliest filing from Adar1 Capital Management, LLC on this page is the Schedule 13G, filed 2026-06-05, reporting 17.5%.
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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What They Do, And How The Money Works
Who Runs It, And How To Reach Them
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Who Pays Them, And Who They Are Up Against
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Which insiders own Rallybio Corp shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- ADAR1 Capital, a 10% owner: 926,352 shares (17.2% of shares outstanding), held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2026-05-20).
- , a 10% owner: 926,352 shares (17.2% of shares outstanding), held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2026-05-20).
- Fidelity (FMR), a 10% owner: 211,798 shares (3.9% of shares outstanding), held indirectly through F-Prime Capital Partners Life Sciences Fund VI LP (Form 3, 2026-03-10).
- , the chief executive and a director: 148,864 shares (2.8% of shares outstanding) (Form 4, 2026-10-29).
- , a director: 125,032 shares (2.3% of shares outstanding) (Form 4, 2026-11-05).
Shares outstanding: 5,383,937 as of 2026-10-20, from the company's latest SEC cover page.
How much has Rallybio Corp raised?
| Filed | Sold | Offered |
|---|---|---|
| Form D, 2024-04-22 | $6.60M | $6.60M |
Latest IPO step: Rallybio Corp withdrew its IPO registration (RW, 2026-05-05).
IPO filings: RW, 2026-05-05.
Keep reading
More on Rallybio Corp and the records around it.
Rallybio Corp elsewhere on the record
- 5%+ stake filings Aug 2026
Companies that share a holder
- 5AM Ventures V, L.P. also filed stake reports on 1 other company: ENTRADA THERAPEUTICS, INC. (Nov 2025)
- Johnson & Johnson also filed stake reports on 2 other companies: CVRx, Inc. (Jan 2026), Rapport Therapeutics, Inc. (Oct 2025)
- Laurion Capital Management LP also filed stake reports on 2 other companies: Pyxis Oncology, Inc. (Nov 2026), IMMUNIC, INC. (Aug 2026)
Related pages
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https://mentionfox.com/who-owns/rallybio