As of November 6, 2026, Electra Therapeutics, Inc. is a publicly traded company (Nasdaq: ETRA). The largest holder reporting an active stake on Schedule 13D is OrbiMed, at 11%. No bankruptcy or receivership appears in its SEC Form 8-K filings. Founder or officer holdings: Beth Seidenberg, M.D., a director (10.1%, reporting on Schedule 13G) (Schedule 13D, September 25, 2026).
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Is Electra Therapeutics, Inc. a real, registered company?
- Electra Therapeutics, Inc. files with the SEC under CIK 2088082 (its SEC filings).
- Its shares are listed under the ticker ETRA 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 Electra Therapeutics, Inc. 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 Dr. Beth C. Seidenberg (filed 2026-10-29).
Who are Electra Therapeutics, Inc.'s owners and officers?
Electra Therapeutics, Inc.: incorporated in Delaware; business address in South San Francisco, California; industry Biological Products, (No Diagnostic Substances) (Schedule 13G, 2026-10-29).
Officers and directors, each with the role and the filing that names them:
- : Director (Form D, 2025-10-30)
- : Director (Form D, 2025-10-30)
- : Director (Form D, 2025-10-30)
- : Director (Form D, 2025-10-30)
- : Director (Form D, 2025-10-30)
- : Executive Officer, Director (Form D, 2025-10-30)
| Report | Holder | Share |
|---|---|---|
| Schedule 13G, 2026-10-29 | Dr. Beth C. Seidenberg | 10.1% |
| Schedule 13G, 2026-09-28 | Lsp 7 Cooperatief U.A. | 6% |
| Schedule 13G, 2026-09-28 | Redmile Group, LLC | 8.7% |
| Schedule 13D, 2026-09-25 | Orbimed Advisors LLC | 11% |
Questions about who owns Electra Therapeutics, Inc.
Who owns Electra Therapeutics, Inc.?
On this page, 4 holders' latest ownership filings report 5% or more of Electra Therapeutics, Inc.: Orbimed Advisors LLC (11%, Schedule 13D, filed 2026-09-25), Dr. Beth C. Seidenberg (10.1%, Schedule 13G, filed 2026-10-29), Redmile Group, LLC (8.7%, Schedule 13G, filed 2026-09-28) and Lsp 7 Cooperatief U.A. (6%, Schedule 13G, filed 2026-09-28).
Who are the largest shareholders of Electra Therapeutics, Inc.?
By the share each holder's latest filing reports, the largest holders of Electra Therapeutics, Inc. on this page are Orbimed Advisors LLC (11%), Dr. Beth C. Seidenberg (10.1%) and Redmile Group, LLC (8.7%).
When did Orbimed Advisors LLC buy into Electra Therapeutics, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Orbimed Advisors LLC on this page is the Schedule 13D, filed 2026-09-25, reporting 11%.
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%); 4 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 the Full Report on Electra Therapeutics, Inc. covers
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Which insiders own Electra Therapeutics, 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.
- Westlake BioPartners Fund I, L.P., a 10% owner: 2,820,403 shares, held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 3, 2026-09-21).
- Westlake BioPartners Fund II, L.P., a 10% owner: 2,820,403 shares, held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 3, 2026-09-21).
- Westlake BioPartners GP II, LLC, a 10% owner: 2,820,403 shares, held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 3, 2026-09-21).
- Westlake BioPartners GP I, LLC, a 10% owner: 2,820,403 shares, held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 3, 2026-09-21).
- OrbiMed, a director and 10% owner: 2,136,979 shares, held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2026-11-05).
Shares only: the company's cover page does not give one share count for a single class, so no percentage is worked out.
How much has Electra Therapeutics, Inc. raised?
| Filed | Sold | Offered |
|---|---|---|
| Form D, 2025-10-30 | $134.19M | $184.13M |
Latest IPO step: Electra Therapeutics, Inc. filed its final IPO prospectus, ticker ETRA (424B4, 2026-09-18).
IPO filings: 424B4, 2026-09-18, S-1/A, 2026-09-14, S-1, 2026-08-28; ticker ETRA on Nasdaq Global Select Market.
Keep reading
More on Electra Therapeutics, Inc. and the records around it.
Electra Therapeutics, Inc. elsewhere on the record
- 5%+ stake filings Oct 2026
- Form D filing Oct 2025
Companies that share a holder
- Westlake BioPartners Fund I, L.P. also filed stake reports on 2 other companies: Latigo Biotherapeutics, Inc. (Oct 2026), Kyverna Therapeutics, Inc. (Feb 2026)
- LSP 7 Cooperatief U.A. also filed stake reports on 3 other companies: Oculis Holding AG (Apr 2026), Evommune, Inc. (Feb 2026), AgomAb Therapeutics NV (Feb 2026)
- Redmile Group, LLC also filed stake reports on 18 other companies: FATE THERAPEUTICS INC (Nov 2026), Neurogene Inc. (Aug 2026), Nurix Therapeutics, Inc. (Aug 2026)
Related pages
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https://mentionfox.com/who-owns/electra-therapeutics