QTTB · Q32 Bio Inc. · Shareholders & Ownership
Market Cap
$257.51M
Shares
29.77M
Volume · Oct 26
563.7K
Avg daily vol (3M)
717.28K
Every disclosed holder of QTTB in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns QTTB
13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positionsNo chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.
| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 22,179,777 | 74.51% |
| Insiders (Forms 3, 4, 5) | 5,484,347 | 18.42% |
| 13D/G-only blocks | 4,959,239 | 16.66% |
| Remaining | 2,853,897 | -9.59% |
| Registered funds (N-PORT, not summed) | 813,894 | 2.73% |
Shares outstanding: 29,769,466, the issuer's latest cover-page count restated onto today's split basis.
Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of QTTB
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
ORBIMED ADVISORS LLC
13D
CIK 1055951 · Registered investment adviser · Jul 16, 2026
Item 4 purpose: none of the classified purposes
not summed
|
4,127,987 | ||
| 1.1 |
ORBIMED ADVISORS LLC
13F
CIK 1055951 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
4,127,987 | ||
| 1.2 |
|
4,127,987 | ||
| 2 |
|
4,127,987 | ||
| 3 |
Boxer Capital Management, LLC
13F
CIK 2018299 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,149,310 | ||
| 3.1 |
Boxer Capital Management, LLC
13G
CIK 2018299 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
3,149,310 | ||
| 4 |
Atlas Venture Life Science Advisors, LLC
13F
CIK 1917529 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,717,106 | ||
| 5 |
BIOTECHNOLOGY VALUE FUND L P
13G
CIK 918923 · Unknown · May 28, 2026
Rule 13d-1(c), passive investor
|
2,367,524 | ||
| 6 |
|
2,350,000 | ||
| 7 |
RA CAPITAL MANAGEMENT, L.P.
13F
CIK 1346824 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,332,457 | ||
| 8 |
|
1,755,116 | ||
| 9 |
Point72 Asset Management, L.P.
13F
CIK 1603466 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,173,396 | ||
| 9.1 |
Point72 Asset Management, L.P.
13G
CIK 1603466 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(c), passive investor, not summed
|
1,173,396 | ||
| 10 |
Opaleye Management Inc.
13F
CIK 1595855 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
931,000 | ||
| 10.1 |
Opaleye Management Inc.
13G
CIK 1595855 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(c), passive investor, not summed
|
931,000 | ||
| 11 |
Atlas Venture Fund X, L.P.
13D
CIK 1628098 · Unknown · May 26, 2026
Item 4 purpose: not restated by this amendment, the earlier 13D's purpose stands
not summed
|
864,261 | ||
| 12 |
Logos Global Management LP
13F
CIK 1792126 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
800,000 | ||
| 13 |
SummitTX Capital, L.P.
13F
CIK 2052310 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
733,774 | ||
| 14 |
|
625,000 | ||
| 15 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
518,803 | ||
| 16 |
Ikarian Capital, LLC
13F
CIK 1778253 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
430,000 | ||
| 17 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
389,115 | ||
| 18 |
|
340,038 | ||
| 19 |
Temasek Holdings (Private) Ltd
13G
CIK 1021944 · Holding company · Sep 30, 2024
Rule 13d-1(c), passive investor
|
313,943 | ||
| 20 |
Woodline Partners LP
13F
CIK 1784547 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
286,212 | ||
| 21 |
|
277,777 | ||
| 22 |
AMERICAN CENTURY COMPANIES INC
13F
CIK 748054 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
272,752 | ||
| 23 |
|
244,083 | ||
| 24 |
ACADIAN ASSET MANAGEMENT LLC
13F
CIK 916542 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
218,234 | ||
| 25 |
ACORN CAPITAL ADVISORS, LLC
13F
CIK 2054410 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
216,171 | ||
| 26 |
|
200,244 | ||
| 27 |
RENAISSANCE TECHNOLOGIES LLC
13F
CIK 1037389 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
179,600 | ||
| 28 |
|
163,131 | ||
| 29 |
JANE STREET GROUP, LLC
13F
CIK 1595888 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
162,747 | ||
| 30 |
|
137,170 | ||
| 31 |
MONIMUS CAPITAL MANAGEMENT, LP
13F
CIK 1848831 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
132,036 | ||
| 32 |
BOOTHBAY FUND MANAGEMENT, LLC
13F
CIK 1549230 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
130,427 | ||
| 33 |
Avantis U.S. Small Cap Value ETF
Fund
S000066459 · Registered fund · May 31, 2026
American Century ETF Trust, not summed
|
128,510 | ||
| 34 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
122,690 | ||
| 35 |
CITADEL ADVISORS LLC
13F
CIK 1423053 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
120,663 | ||
| 36 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
119,269 | ||
| 37 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
118,507 | ||
| 37.1 |
iShares Micro-Cap ETF
Fund
S000004439 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
29,465 | ||
| 38 |
MARSHALL WACE, LLP
13F
CIK 1318757 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
67,045 | ||
| 39 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
66,217 | ||
| 40 |
Carlyle Group Inc.
13F
CIK 1527166 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
60,363 | ||
| 40.1 |
Carlyle Group Inc.
13G
CIK 1527166 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(c), passive investor, not summed
|
691,735 | ||
| 41 |
|
53,521 | ||
| 42 |
|
52,214 | ||
| 43 |
TWO SIGMA INVESTMENTS, LP
13F
CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
49,582 | ||
| 44 |
Anders Hove
13D
CIK 1766853 · Unknown · Mar 25, 2024
|
44,635 | ||
| 45 |
|
37,500 | ||
| 46 |
Quadrature Capital Ltd
13F
CIK 1651424 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
36,396 | ||
| 47 |
BRIDGEWAY CAPITAL MANAGEMENT, LLC
13F
CIK 1107261 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
34,613 | ||
| 47.1 |
Ultra-Small Company Fund
Fund
S000004423 · Registered fund · Jun 30, 2026
Bridgeway Funds, Inc., not summed
|
34,613 | ||
| 48 |
DAFNA Capital Management LLC
13F
CIK 1389933 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
32,896 | ||
| 49 |
Knott David M Jr
13F
CIK 1892770 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
30,412 | ||
| 50 |
Affinity Asset Advisors, LLC
13F
CIK 1773195 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
27,777 |
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.
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