Q32 Bio Inc. (QTTB)
Nasdaq: QTTB · Pharmaceutical Preparations · Waltham, MA · filing with the SEC since 2016
Who owns Q32 Bio Inc.
As filed with the SECHolders of 5% or more
7
Orbimed Advisors LLC holds 13.9% of COMMON STOCK, as its SCHEDULE 13D/A filed Jul 20, 2026 says.
Directors and officers
14
report now, of 40 people on the record since 2018. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 7 named at left.
Holders of 5% or moreshare of the class, as filed
Orbimed Advisors LLC
SCHEDULE 13D/A · filed Jul 20, 2026 · COMMON STOCK · 17.4% in Jun 1, 2026
Boxer Capital Management, LLC
SCHEDULE 13G · filed Jul 10, 2026 · Common Stock, $0.0001 par value per share
Bvf Partners L P/il
SCHEDULE 13G · filed Jun 4, 2026 · Common Stock, par value $0.0001 per share
RA Capital Management, L.P.
SCHEDULE 13G · filed Jun 4, 2026 · Common Stock, par value $0.0001 per share
Frazier Life Sciences Public Fund, L.P.
SCHEDULE 13G · filed Oct 9, 2026 · Common Stock, $0.00001 par value
Opaleye Management Inc.
SCHEDULE 13G/A · filed Jul 31, 2026 · Common Stock, par value $0.0001 per share · 8.59% in May 6, 2026
ADAR1 Partners, LP
SCHEDULE 13G · filed Mar 14, 2024 · Common Stock, $0.0001 par value per share
Point72 Asset Management, L.P.
SCHEDULE 13G/A · filed Aug 14, 2026 · Common Stock, par value $0.0001 per share · reported falling below 5%, from 5.7% in May 15, 2026
The Carlyle Group Inc.
SCHEDULE 13G/A · filed Jul 6, 2026 · Common Stock, par value $0.0001 per share · reported falling below 5%
Atlas Venture Fund X, L.P.
SCHEDULE 13D/A · filed May 28, 2026 · Common Stock, par value $0.0001 per share · reported falling below 5%
Pfizer Inc.
SCHEDULE 13G/A · filed Feb 13, 2026 · Common Stock par value $0.0001 per share · reported falling below 5%
Bristol-Myers Squibb Co.
SCHEDULE 13G/A · filed Feb 14, 2025 · Common stock, par value $0.0001 per share · reported falling below 5%
Sirenia Capital Management LP
SCHEDULE 13G/A · filed Aug 14, 2026 · Common Stock, par value $0.0001 per share · reported falling below 5%, from 9.9% in May 15, 2026
Sio Capital Management, LLC
SCHEDULE 13G · filed Apr 8, 2025 · Common stock, par value $0.0001 per share · reported falling below 5%, from 5.73% in Feb 10, 2025
What QTTB reports owning in othersstakes of 5% or more, and other ties
Other ties the annual report names
Legacy Q32
An entity · consolidated entity · owns, named in the 10-K filed Mar 10, 2026
3 subsidiaries in 2 countries, from the list filed with the 10-K/A filed Apr 12, 2024.
Insider tradesForm 4
11sales
4purchases
0sales on a scheduled plan
3people selling
$500,000sold, in dollars
$30.0Mbought, in dollars
Open-market trades on Form 4 from Oct 14, 2025 to Oct 14, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Oct 14, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window5 of 60 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Morrison Jodie Pope | CEO | 4 | $300,000 | 0 | 0 | $0 |
| Kalowski Lee | CFO and President | 4 | $100,000 | 0 | 0 | $0 |
| Violette Shelia M. | Chief Scientific Officer | 3 | $100,000 | 0 | 0 | $0 |
| Xu Diyong | director | 0 | $0 | 0 | 2 | $15.0M |
| Orbimed Capital Gp Vii LLC | director | 0 | $0 | 0 | 2 | $15.0M |