As of November 10, 2026, Septerna, Inc. is a publicly traded company (Nasdaq: SEPN). The largest holder reporting an active stake on Schedule 13D is RA Capital, at 11.8%. No bankruptcy or receivership appears in its SEC Form 8-K filings. Passive holders reporting on Schedule 13G include Driehaus Capital Management LLC (9.83%) (Schedule 13D/A, August 14, 2026).
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Is Septerna, Inc. a real, registered company?
- Septerna, Inc. files with the SEC under CIK 1984086 (its SEC filings).
- Its shares are listed under the ticker SEPN on Nasdaq (SEC company record).
- Incorporated in Delaware; business address in South San Francisco, 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 Septerna, Inc. in our court records and SEC 8-K records (as of 2026-11-10).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Driehaus Capital Management LLC (filed 2026-08-14).
Who are Septerna, Inc.'s owners and officers?
Septerna, Inc.: incorporated in Delaware; business address in South San Francisco, California; 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, 2023-07-13)
- : Director (Form D, 2023-07-13)
- : Director (Form D, 2023-07-13)
- : Director (Form D, 2023-07-13)
- : Director (Form D, 2023-07-13)
- : Executive Officer (Form D, 2023-07-13)
- : Executive Officer (Form D, 2023-07-13)
- : Executive Officer (Form D, 2023-07-13)
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-08-14 | Driehaus Capital Management LLC | 9.83% |
| Schedule 13D/A, 2026-08-14 | Ra Capital Management, L.P. | 11.8% |
| Schedule 13G/A, 2026-02-17 | Bvf Partners L P/Il | 3.8% |
Questions about who owns Septerna, Inc.
Who owns Septerna, Inc.?
On this page, 2 holders' latest ownership filings report 5% or more of Septerna, Inc.: Ra Capital Management, L.P. (11.8%, Schedule 13D/A, filed 2026-08-14) and Driehaus Capital Management LLC (9.83%, Schedule 13G/A, filed 2026-08-14).
Who are the largest shareholders of Septerna, Inc.?
By the share each holder's latest filing reports, the largest holders of Septerna, Inc. on this page are Ra Capital Management, L.P. (11.8%) and Driehaus Capital Management LLC (9.83%).
When did Ra Capital Management, L.P. buy into Septerna, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Ra Capital Management, L.P. on this page is the Schedule 13D/A, filed 2026-08-14, reporting 11.8%. That earliest filing is itself an amendment, which updates an earlier report.
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%); 3 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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Which insiders own Septerna, 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.
- Third Rock Ventures V, L.P., a 10% owner: 10,280,050 shares (21.6% of shares outstanding), 6,068,391 held directly and 4,211,659 indirectly, on a joint filing (Form 4, 2026-08-14).
- TRV GP VI, LLC, a 10% owner: 10,280,050 shares (21.6% of shares outstanding), 6,068,391 held directly and 4,211,659 indirectly, on a joint filing (Form 4, 2026-08-14).
- TRV GP V, LLC, a 10% owner: 10,280,050 shares (21.6% of shares outstanding), 6,068,391 held directly and 4,211,659 indirectly, on a joint filing (Form 4, 2026-08-14).
- Third Rock Ventures GP V, LP, a 10% owner: 10,280,050 shares (21.6% of shares outstanding), 6,068,391 held directly and 4,211,659 indirectly, on a joint filing (Form 4, 2026-08-14).
- Third Rock Ventures GP VI, L.P., a 10% owner: 10,280,050 shares (21.6% of shares outstanding), 6,068,391 held directly and 4,211,659 indirectly, on a joint filing (Form 4, 2026-08-14).
Shares outstanding: 47,549,223 as of 2026-11-04, from the company's latest SEC cover page.
How much has Septerna, Inc. raised?
| Filed | Sold | Offered |
|---|---|---|
| Form D, 2023-07-13 | $73.50M | $150M |
Latest IPO step: Septerna, Inc. filed its final IPO prospectus (424B4, 2024-10-25).
IPO filings: 424B4, 2024-10-25, S-1/A, 2024-10-24, S-1/A, 2024-10-21, S-1, 2024-10-02.
Keep reading
More on Septerna, Inc. and the records around it.
Septerna, Inc. elsewhere on the record
- 5%+ stake filings Aug 2026
- IPO filing Oct 2024
Companies that share a holder
- DRIEHAUS CAPITAL MANAGEMENT LLC also filed stake reports on 16 other companies: Cardinal Infrastructure Group Inc. (Aug 2026), Cue Biopharma, Inc. (Aug 2026), Definium Therapeutics, Inc. (Aug 2026)
- BIOTECHNOLOGY VALUE FUND L P also filed stake reports on 55 other companies: Frazier Life Sciences Acquisition Corp. II (Oct 2026), Olema Pharmaceuticals, Inc. (Oct 2026), Foghorn Therapeutics Inc. (Oct 2026)
- RA Capital Management, L.P. also filed stake reports on 100 other companies: Climb Bio, Inc. (Nov 2026), Bambusa Therapeutics, Inc. (Nov 2026), SOLID BIOSCIENCES INC. (Nov 2026)
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