Atlas Venture Opportunity Fund Ill, L.P. - 26 May 2026 Form 3 Insider Report for Q32 Bio Inc. (QTTB)

Reporting relationship: Other*
Issuer ticker: QTTB
Reported as of: 26 May 2026
Net transaction value: $0
SEC form: 3
Accepted by SEC: 08 Jun 2026, 16:30:23 UTC
Source filing: View source filing
Reporting owner signature: Atlas Venture Opportunity Fund III, L.P., By: Atlas Venture Associates Opportunity III, L.P., its general partner, By: Atlas Venture Associates Opportunity III, LLC, its general partner, By: /s/ Ommer Chohan, Chief...

Open signature details

Atlas Venture Opportunity Fund III, L.P., By: Atlas Venture Associates Opportunity III, L.P., its general partner, By: Atlas Venture Associates Opportunity III, LLC, its general partner, By: /s/ Ommer Chohan, Chief Financial Officer

Key filing fact

Atlas Venture Opportunity Fund Ill, L.P. filed Form 3 for Q32 Bio Inc. (QTTB) on 08 Jun 2026.

Key facts

This page summarizes Atlas Venture Opportunity Fund Ill, L.P.'s Form 3 filing for Q32 Bio Inc. (QTTB).
0 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 08 Jun 2026, 16:30.

Change

No earlier filing in this sequence is available for direct comparison.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Official SEC source

Ownership activity is grounded in SEC Form 3 disclosures.

View source filing

Reporting Owners (3)

CIK 0002078188 Primary reporting owner

Atlas Venture Opportunity Fund Ill, L.P.

Relationship: Other*
Address: ATLAS VENTURE, 300 TECHNOLOGY SQUARE, 8TH FLOOR, CAMBRIDGE
Signature: Atlas Venture Opportunity Fund III, L.P., By: Atlas Venture Associates Opportunity III, L.P., its general partner, By: Atlas Venture Associates Opportunity III, LLC, its general partner, By: /s/ Ommer Chohan, Chief Financial Officer
Signature date: 08 Jun 2026

CIK 0002137711

Atlas Venture Associates Opportunity III, L.P.

Relationship: Other*
Address: 300 TECHNOLOGY SQ., 8TH FLOOR, CAMBRIDGE
Signature: Atlas Venture Associates Opportunity III, L.P., By: Atlas Venture Associates Opportunity III, LLC, its general partner, By: /s/ Ommer Chohan, Chief Financial Officer
Signature date: 08 Jun 2026

CIK 0002137715

Atlas Venture Associates Opportunity III, LLC

Relationship: Other*
Address: 300 TECHNOLOGY SQ., 8TH FLOOR, CAMBRIDGE
Signature: Atlas Venture Associates Opportunity III, LLC, By: /s/ Ommer Chohan, Chief Financial Officer
Signature date: 08 Jun 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

QTTB holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 625,000
Date: 26 May 2026
Ownership: Direct
Footnotes: F1

QTTB holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 625,000
Date: 26 May 2026
Ownership: Direct
Footnotes: F1

QTTB holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 625,000
Date: 26 May 2026
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

The shares are owned directly by Atlas Venture Opportunity Fund III, L.P. ("AVOF III"). Atlas Venture Associates Opportunity III, L.P. ("AVAO III LP") is the general partner of AVOF III. Atlas Venture Associates Opportunity III, LLC ("AVAO III LLC") is the general partner of AVAO III LP. Each of AVAO III LP and AVAO III LLC disclaims beneficial ownership of the securities held by AVOF III, except to the extent of its pecuniary interest therein, if any.

SEC remarks

The Reporting Persons are under common control with other entities affiliated with Atlas Venture who, together with the Reporting Persons, collectively beneficially own in the aggregate greater than 10% of the outstanding common stock of the Issuer. The Reporting Persons may be deemed to be members of a "group" with such other entities for purposes of Section 13 of the Exchange Act. However, the Reporting Persons disclaim such group membership, and this Form 3 shall not be deemed an admission that the Reporting Persons are members of a group for purposes of Section 13 of the Exchange Act or for any other purposes.