As of November 6, 2026, Anaptysbio, Inc. is a publicly traded company (Nasdaq: ANAB); its largest reported holder is Sirenia Capital Management LP, with 5% on Schedule 13G/A of August 14, 2026 (Schedule 13G/A, August 14, 2026).
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Is Anaptysbio, Inc. a real, registered company?
- Anaptysbio, Inc files with the SEC under CIK 1370053 (its SEC filings).
- Its shares are listed under the ticker ANAB on Nasdaq (SEC company record).
- Incorporated in Delaware; business address in San Diego, California, 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 ANAPTYSBIO, INC in our court records and SEC 8-K records (as of 2026-11-06).
- Leadership changes: the latest reported is Christopher M. Murphy, Chief Financial Officer (Form 8-K filed 2026-05-11). Check you are dealing with the people now in charge.
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Sirenia Capital Management LP (filed 2026-08-14).
Who are Anaptysbio, Inc.'s owners and officers?
Anaptysbio, Inc.: incorporated in Delaware; business address in San Diego, California; industry Pharmaceutical Preparations (Schedule 13G/A, 2026-08-14).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-08-14 | Sirenia Capital Management LP | 5% |
| Schedule 13G, 2026-05-15 | Sirenia Capital Management LP | 6.7% |
| Schedule 13G/A, 2026-05-15 | Point72 Asset Management, L.P. | 0.2% |
| Schedule 13G/A, 2026-03-26 | The Vanguard Group | 0% |
| Schedule 13G/A, 2026-02-11 | Morgan Stanley | 3.6% |
| Schedule 13G/A, 2026-01-16 | Millennium Management LLC | 2.9% |
| Schedule 13G/A, 2025-11-14 | Mathew P. Arens | 3.12% |
| Schedule 13G/A, 2025-11-12 | The Goldman Sachs Group, Inc. | 4.5% |
| Schedule 13G, 2025-09-23 | Millennium Management LLC | 5.1% |
| Schedule 13G/A, 2025-08-07 | Mathew P. Arens | 7.71% |
| Schedule 13G, 2025-08-05 | Morgan Stanley | 6.3% |
| Schedule 13G, 2025-07-29 | The Vanguard Group | 5.23% |
Questions about who owns Anaptysbio, Inc.
Who owns Anaptysbio, Inc.?
On this page, one holder's latest ownership filing reports 5% or more of Anaptysbio, Inc.: Sirenia Capital Management LP (5%, Schedule 13G/A, filed 2026-08-14).
When did Sirenia Capital Management LP buy into Anaptysbio, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Sirenia Capital Management LP on this page is the Schedule 13G, filed 2026-05-15, reporting 6.7%; its latest, Schedule 13G/A filed 2026-08-14, reports 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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| Filed | Person | Role | Change | Effective |
|---|---|---|---|---|
| Form 8-K, 2026-05-11 | Christopher M. Murphy | Chief Financial Officer | appointed | 2026-05-11 |
| Form 8-K, 2026-05-11 | Christopher M. Murphy | appointed | ||
| Form 8-K, 2026-05-11 | Owen Hughes | Director | appointed | 2026-05-11 |
Which insiders own Anaptysbio, Inc. 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.
- , a director and 10% owner: 7,880,094 shares (26.4% of shares outstanding), held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2025-01-02).
- EcoR1 Capital, LLC, a director and 10% owner: 7,880,094 shares (26.4% of shares outstanding), held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2025-01-02).
- , the chief executive and president: 495,965 shares (1.7% of shares outstanding) (Form 4, 2026-03-27).
- , the chief medical officer: 42,088 shares (0.14% of shares outstanding) (Form 4, 2026-01-09).
- , a director: 37,652 shares (0.13% of shares outstanding) (Form 4, 2026-06-17).
Shares outstanding: 29,895,244 as of 2026-09-16, from the company's latest SEC cover page.
How much has Anaptysbio, Inc. raised?
Acquisitions reported on Form 8-K, Item 2.01: completed an acquisition (2026-04-20).
Keep reading
More on Anaptysbio, Inc. and the records around it.
Anaptysbio, Inc. elsewhere on the record
- 5%+ stake filings Aug 2026
- Leadership changes May 2026
Companies that share a holder
- First Light Asset Management, LLC also filed stake reports on 12 other companies: NeuroPace Inc (Sep 2026), Neogenomics, Inc. (Aug 2026), PALVELLA THERAPEUTICS, INC. (Aug 2026)
- Sirenia Capital Management LP also filed stake reports on 19 other companies: Alto Neuroscience, Inc. (Aug 2026), CYBIN INC. (Aug 2026), Design Therapeutics, Inc. (Aug 2026)
- Point72 Asset Management, L.P. also filed stake reports on 90 other companies: Immunocore Holdings plc (Nov 2026), Target Hospitality Corp. (Nov 2026), E.W. SCRIPPS Co (Oct 2026)
Related pages
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