SEC Form 3 · accession 0000947871-26-000874

Electra Therapeutics, Inc. · ETRA

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owners

ORBIMED ADVISORS LLC

Director

OrbiMed Capital GP VII LLC

Director

OrbiMed Genesis GP LLC

Director

Period of report

Sep 18, 2026

Accepted (ET)

Sep 18, 2026 · 4:47 pm EDT

Rule 10b5-1 plan

unknown — predates the checkbox

Issuer CIK

0002088082

Table I — non-derivative securities

No Table I lines on this filing.

Table II — derivative securities

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Series A Convertible Preferred Stock^F2,F4,F1	—	holding	—	—	—	—	—	Common Stock	2,002,310	—	I
Series B Convertible Preferred Stock^F2,F4,F1	—	holding	—	—	—	—	—	Common Stock	1,087,934	—	I
Series C Convertible Preferred Stock^F3,F4,F1	—	holding	—	—	—	—	—	Common Stock	758,279	—	I
Series C Convertible Preferred Stock^F2,F4,F1	—	holding	—	—	—	—	—	Common Stock	1,703,314	—	I

Explanation of responses

F1Each share of Series A Convertible Preferred Stock, Series B Convertible Preferred Stock and Series C Convertible Preferred Stock (collectively, the "Preferred Stock") will automatically convert into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock has no expiration date.
F2These securities are held directly by OrbiMed Private Investments VII, LP ("OPI VII"). OrbiMed Capital GP VII LLC ("GP VII") is the general partner of OPI VII. OrbiMed Advisors LLC ("OrbiMed Advisors") is the managing member of GP VII. By virtue of such relationships, GP VII and OrbiMed Advisors may be deemed to have voting power and investment power over the securities held by OPI VII and as a result, may be deemed to have beneficial ownership over such securities. OrbiMed Advisors exercises voting and investment power through a management committee comprised of Carl L. Gordon, W. Carter Neild, and Geoffrey C. Hsu, each of whom disclaims beneficial ownership of the shares held by OPI VII.
F3These securities are held directly by OrbiMed Genesis Master Fund, L.P. ("OrbiMed Genesis"). OrbiMed Genesis GP LLC ("Genesis GP") is the general partner of OrbiMed Genesis. OrbiMed Advisors is the managing member of Genesis GP. By virtue of such relationships, Genesis GP and OrbiMed Advisors may be deemed to have voting power and investment power over the securities held by OrbiMed Genesis and as a result, may be deemed to have beneficial ownership over such securities. OrbiMed Advisors exercises voting and investment power through a management committee comprised of Carl L. Gordon, W. Carter Neild, and Geoffrey C. Hsu, each of whom disclaims beneficial ownership of the shares held by OrbiMed Genesis.
F4This report on Form 3 is jointly filed by OrbiMed Advisors, GP VII and Genesis GP. Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of its pecuniary interest therein, if any. The Reporting Persons have designated Carl L. Gordon, a member of OrbiMed Advisors, to serve on the Issuer's board of directors. This report shall not be deemed an admission that any of such entity or person is a beneficial owner of such securities for purposes of Section 16 of the Exchange Act, or for any other purpose.