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OrbiMed reports Q32 Bio (QTTB) ownership diluted to 15.4% stake

Filing Impact
(Moderate)
Filing Sentiment
(Neutral)
Form Type
SCHEDULE 13D/A

Rhea-AI Filing Summary

OrbiMed Advisors LLC and OrbiMed Capital GP VII LLC filed Amendment No. 1 to their Schedule 13D on Q32 Bio Inc., reporting beneficial ownership of 2,252,987 shares of common stock, or 15.4% of the outstanding shares.

The filing explains that their ownership percentage decreased by more than 1% because Q32 Bio’s total shares outstanding increased, not because OrbiMed changed its share count. The 15.4% figure is based on 14,629,463 shares outstanding as set forth in Q32 Bio’s Form 10‑K filed on March 1, 2026.

The shares are held by OrbiMed Private Investments VII, LP, with OrbiMed GP as its general partner and OrbiMed Advisors as managing member, giving them shared voting and dispositive power. OrbiMed indicates it may buy or sell Q32 Bio shares in the future depending on company performance, market conditions and other factors, but states it has no current plans for corporate control actions such as mergers, board changes or major asset sales.

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OrbiMed Advisors LLC
601 Lexington Avenue, 54th Floor,
New York, NY, 10022
(212) 739-6400


OrbiMed Capital GP VII LLC
601 Lexington Avenue, 54th Floor,
New York, NY, 10022
(212) 739-6400

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)
02/18/2026

(Date of Event Which Requires Filing of This Statement)


If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).






SCHEDULE 13D






SCHEDULE 13D






SCHEDULE 13D


ORBIMED ADVISORS LLC
Signature:/s/ Carl L. Gordon
Name/Title:Carl L. Gordon/Member
Date:03/12/2026
ORBIMED CAPITAL GP VII LLC
Signature:/s/ Carl L. Gordon
Name/Title:Carl L. Gordon/Member of OrbiMed Advisors LLC
Date:03/12/2026

FAQ

How large is OrbiMed’s current ownership stake in Q32 Bio (QTTB)?

OrbiMed reports beneficial ownership of 2,252,987 Q32 Bio common shares, representing 15.4% of the company’s outstanding stock. This percentage is calculated using 14,629,463 shares outstanding, as disclosed in Q32 Bio’s Form 10‑K filed on March 1, 2026.

Why did OrbiMed file Amendment No. 1 to its Schedule 13D on Q32 Bio (QTTB)?

The amendment was filed because OrbiMed’s percentage ownership in Q32 Bio decreased by more than 1% due to an increase in the number of shares outstanding. The filing clarifies that this change reflects dilution from new shares rather than a reduction in OrbiMed’s share count.

Did OrbiMed buy or sell Q32 Bio (QTTB) shares in connection with this amendment?

The amendment describes a lower ownership percentage caused by more Q32 Bio shares outstanding, not by OrbiMed changing its holdings. OrbiMed continues to beneficially own 2,252,987 shares and reports shared voting and dispositive power over that position through affiliated entities.

Who actually holds the Q32 Bio (QTTB) shares reported by OrbiMed?

The 2,252,987 Q32 Bio shares are held by OrbiMed Private Investments VII, LP (OPI VII). OrbiMed Capital GP VII LLC is OPI VII’s general partner, and OrbiMed Advisors LLC is managing member of OrbiMed GP, giving them shared authority over voting and disposition of these shares.

Does OrbiMed indicate any plans to influence control of Q32 Bio (QTTB)?

OrbiMed states it may buy or sell Q32 Bio shares based on business and market factors but does not currently have specific plans for mergers, major asset sales, board changes or other control transactions, beyond normal investment review and potential future trading activity.

What role does OrbiMed’s representative have at Q32 Bio (QTTB)?

Diyong Xu, an employee of OrbiMed Advisors, serves on Q32 Bio’s Board of Directors, giving OrbiMed potential influence. Under agreements with OrbiMed, any equity compensation Xu receives from Q32 Bio is transferred or economically allocated to OrbiMed entities and ultimately to OPI VII.

What registration rights does OrbiMed have for its Q32 Bio (QTTB) shares?

Through a Registration Rights Agreement, OrbiMed’s fund OPI VII and other investors are entitled to have certain Q32 Bio shares registered for resale. Q32 Bio agreed to file and maintain a shelf registration statement covering these shares and to bear specified expenses and indemnification obligations.

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