Company · Ownership research

Q32 Bio Inc. QTTB

CIK 0001661998 · CUSIP 746964105

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 746964105 (QTTB), not CUSIP 746964955 (QTTB), CUSIP 746964905 (QTTB), and does not merge CUSIPs.

This page lists the top 20 of 53 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	ORBIMED ADVISORS LLC CIK 1055951 · View history	$4.46M 2,252,987 shares	0.11%	0(0.00%)Unchanged	SEC filing ↗ Nov 14, 2025	▾
02	Atlas Venture Life Science Advisors, LLC CIK 1917529 · View history	$4.14M 2,092,106 shares	0.55%	0(0.00%)Unchanged	SEC filing ↗ Nov 13, 2025	▾
03	Carlyle Group Inc. CIK 1527166 · View history	$2.13M 1,102,741 shares	0.05%	0(0.00%)Unchanged	SEC filing ↗ Nov 7, 2025	▾
04	ACORN CAPITAL ADVISORS, LLC CIK 2054410 · View history	$1.59M 803,425 shares	0.81%	0(0.00%)Unchanged	SEC filing ↗ Nov 17, 2025	▾
05	ARCH Venture Management, LLC CIK 1274403 · View history	$634.55K 320,482 shares	0.13%	0(0.00%)Unchanged	SEC filing ↗ Nov 14, 2025	▾
06	Monaco Asset Management SAM CIK 1803593 · View history	$616.05K 311,137 shares	0.23%	-280.80K(-47.40%)Reduced	SEC filing ↗ Nov 10, 2025	▾
07	VANGUARD GROUP INC CIK 102909 · View history	$584.91K 295,409 shares	0.00%	+25.98K(+9.60%)Added	SEC filing ↗ Nov 7, 2025	▾
08	Pfizer Inc CIK 78003 · View history	$550.00K 277,777 shares	0.13%	0(0.00%)Unchanged	SEC filing ↗ Nov 13, 2025	▾
09	Sanofi CIK 1121404 · View history	$483.28K 244,083 shares	0.19%	0(0.00%)Unchanged	SEC filing ↗ Nov 4, 2025	▾
10	Trustees of Columbia University in the City of New York CIK 1420995 · View history	$265.13K 133,903 shares	0.04%	0(0.00%)Unchanged	SEC filing ↗ Nov 14, 2025	▾
11	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$207.45K 104,772 shares	0.00%	-25.61K(-19.60%)Reduced	SEC filing ↗ Nov 14, 2025	▾
12	BlackRock, Inc. CIK 2012383 · View history	$184.15K 93,005 shares	0.00%	-85.67K(-47.90%)Reduced	SEC filing ↗ Nov 12, 2025	▾
13	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$175.28K 88,496 shares	0.00%	+26.90K(+43.70%)Added	SEC filing ↗ Nov 12, 2025	▾
14	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$93.65K 47,300 shares	0.00%	-29.70K(-38.60%)Reduced	SEC filing ↗ Nov 13, 2025	▾
15	NORTHERN TRUST CORP CIK 73124 · View history	$63.27K 31,953 shares	0.00%	+5.89K(+22.60%)Added	SEC filing ↗ Nov 14, 2025	▾
16	TWO SIGMA INVESTMENTS, LP CIK 1179392 · View history	$62.38K 31,506 shares	0.00%	+31.51KNew	SEC filing ↗ Nov 14, 2025	▾
17	ACADIAN ASSET MANAGEMENT LLC CIK 916542 · View history	$58.00K 29,739 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Nov 13, 2025	▾
18	Affinity Asset Advisors, LLC CIK 1773195 · View history	$55.00K 27,777 shares	0.01%	0(0.00%)Unchanged	SEC filing ↗ Nov 13, 2025	▾
19	STATE STREET CORP CIK 93751 · View history	$42.05K 21,237 shares	0.00%	-5.70K(-21.20%)Reduced	SEC filing ↗ Nov 14, 2025	▾
20	FMR LLC CIK 315066 · View history	$31.42K 15,867 shares	0.00%	-26.57K(-62.60%)Reduced	SEC filing ↗ Nov 13, 2025	▾

Showing 20 / 53 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

Cancelled or null records excluded

Disclosed shares

8,428,829

Not deduplicated across managers

Disclosed value

$16.63M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Q32 Bio Inc. · Q3 2025

Explore all 53 reporting institutions.

This page includes 20 of 53 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.