$QTTB

$8.71 +$0.26 (3.08%) Close

$QTTB Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 29.8M shares outstanding

Who owns QTTB?

By type of holder

Institutions 74.4% Insiders 16.3% Everyone else 9.2%

Concentration Top 10 holders own 80.7%

Orbimed Advisors LLC 13.9% · Orbimed Capital GP Vii LLC 11.8%

Institutional ownership

74.4%

+42.8 pts vs last qtr

Institutional holders

+17 vs last qtr

Net shares bought

+12.7M

by institutions in Q2 2026

New / sold out

26 / 9

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Boxer Capital Management, LLC NEW +3.1M
BVF Inc/il NEW +2.4M

Biggest sellers in Q2 2026

Carlyle Group Inc. −1.0M
Opaleye Management Inc. −325.2K

Who is planning to sell?

Notices of proposed sale, last 12 months

$109K

2 notices from 2 people

Shares covered

31.6K

0.11% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Jodie Morrison Officer $77.9K
Lee Kalowski Officer $31.4K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2023–FY2025

+3428.0%

+493.97% a year

Each share's claim on the business

−97.2%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $11.1M

over 3 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years4% 3–5 years0% 1–3 years36% Under 1 year61%

Quarterly turnover

91.4%

of institutional shares changed hands

Top 10 managers, median time held

0 quarters

Super Investors

Investment managers reporting QTTB on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
OA Orbimed Advisors LLC 13D · 13.9%	4.1M	13.87%	+1.9M (+83.2%)	2024	1.0%
Shares held by quarter Peak holding4.1M (Q2'26) Change over 8 quarters+1.9M Share of the company13.870% Disclosed stake13D · 13.9% Orbimed Advisors LLC's full portfolio →
BC Boxer Capital Management, LLC	3.1M	10.58%	NEW	Q2 '26	3.0%
Shares held by quarter Peak holding3.1M (Q2'26) Change over 8 quarters+3.1M Share of the company10.580% Boxer Capital Management, LLC's full portfolio →

Orbimed Advisors LLC

13D · 13.9%

4.1M

% of company

13.87%

Change vs last qtr

+1.9M (+83.2%)

Held since

2024

Boxer Capital Management, LLC

3.1M

% of company

10.58%

Change vs last qtr

NEW

Held since

Q2 '26

28 more super investors behind a free account

See every manager holding Q32 Bio Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting QTTB on Form N-PORT; together they hold 2.8% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$4.96M	389.1K	1.31%	0.00%	June 30, 2026
VE Vanguard Extended Market Index Fund Vanguard Index Funds	$1.52M	119.3K	0.40%	0.00%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$4.96M

% of company

1.31%

% of the fund

0.00%

As of

June 30, 2026

Vanguard Extended Market Index Fund

Vanguard Index Funds

Position value

$1.52M

% of company

0.40%

% of the fund

0.00%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Q32 Bio Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
OC Orbimed Capital GP Vii LLC 5%+ holder 13D · 11.8%	3.5M	11.77%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company11.770% Disclosed stake13D · 11.8% View the 13D/G filing →
XD Xu Diyong Insider	2.9M	9.67%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company9.670% Xu Diyong's insider activity →

Orbimed Capital GP Vii LLC

5%+ holder13D · 11.8%

3.5M

% of company

11.77%

Change vs last qtr

—

Held since

—

Xu Diyong

Insider

2.9M

% of company

9.67%

Change vs last qtr

—

Held since

—

16 more holders behind a free account

See every insider and 5%+ holder of Q32 Bio Inc..

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