WALTHAM, MA
Q32 BIO INC.FIXX— Latest position per institution from SEC 13F filings
15
Institutional holders
22.67M
Total shares held
290.40M
Estimated value
1.13M
Avg. position size
ORBIMED ADVISORS LLC
CIK 1055951
Shares
4.13M
Value
52.59M
Filed
Jun 30, 2026
BOXER CAPITAL MANAGEMENT, LLC
CIK 2018299
Shares
3.15M
Value
40.12M
Filed
Jun 30, 2026
ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC
CIK 1917529
Shares
2.72M
Value
34.62M
Filed
Jun 30, 2026
BVF INC/IL
CIK 1056807
Shares
2.35M
Value
29.94M
Filed
Jun 30, 2026
RA CAPITAL MANAGEMENT, L.P.
CIK 1346824
Shares
2.33M
Value
29.72M
Filed
Jun 30, 2026
POINT72 ASSET MANAGEMENT, L.P.
CIK 1603466
Shares
1.17M
Value
14.95M
Filed
Jun 30, 2026
OPALEYE MANAGEMENT INC.
CIK 1595855
Shares
931K
Value
11.86M
Filed
Jun 30, 2026
LOGOS GLOBAL MANAGEMENT LP
CIK 1792126
Shares
800K
Value
10.19M
Filed
Jun 30, 2026
SUMMITTX CAPITAL, L.P.
CIK 2052310
Shares
733.77K
Value
9.35M
Filed
Jun 30, 2026
SIO CAPITAL MANAGEMENT, LLC
CIK 1482416
Shares
697.41K
Value
2.40M
Filed
Dec 31, 2024
IKARIAN CAPITAL, LLC
CIK 1778253
Shares
630K
Value
8.03M
Filed
Jun 30, 2026
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
518.80K
Value
6.61M
Filed
Jun 30, 2026
ADAGE CAPITAL PARTNERS GP, L.L.C.
CIK 1165408
Shares
404.41K
Value
18.04M
Filed
Sep 30, 2024
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
342.27K
Value
6.14M
Filed
Jun 30, 2024
VANGUARD GROUP INC
CIK 102909
Shares
321.05K
Value
1.07M
Filed
Dec 31, 2025
ARCH VENTURE MANAGEMENT, LLC
CIK 1274403
Shares
320.48K
Value
2.06M
Filed
Mar 31, 2026
TEMASEK HOLDINGS (PRIVATE) LTD
CIK 1021944
Shares
313.94K
Value
1.08M
Filed
Dec 31, 2024
WOODLINE PARTNERS LP
CIK 1784547
Shares
286.21K
Value
3.65M
Filed
Jun 30, 2026
AMERICAN CENTURY COMPANIES INC
CIK 748054
Shares
272.75K
Value
3.47M
Filed
Jun 30, 2026
5AM VENTURE MANAGEMENT, LLC
CIK 1799883
Shares
251.99K
Value
4.52M
Filed
Jun 30, 2024
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | ORBIMED ADVISORS LLC | 1055951 | 4.13M | 52.59M | Jun 30, 2026 |
| 2 | BOXER CAPITAL MANAGEMENT, LLC | 2018299 | 3.15M | 40.12M | Jun 30, 2026 |
| 3 | ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC | 1917529 | 2.72M | 34.62M | Jun 30, 2026 |
| 4 | BVF INC/IL | 1056807 | 2.35M | 29.94M | Jun 30, 2026 |
| 5 | RA CAPITAL MANAGEMENT, L.P. | 1346824 | 2.33M | 29.72M | Jun 30, 2026 |
| 6 | POINT72 ASSET MANAGEMENT, L.P. | 1603466 | 1.17M | 14.95M | Jun 30, 2026 |
| 7 | OPALEYE MANAGEMENT INC. | 1595855 | 931K | 11.86M | Jun 30, 2026 |
| 8 | LOGOS GLOBAL MANAGEMENT LP | 1792126 | 800K | 10.19M | Jun 30, 2026 |
| 9 | SUMMITTX CAPITAL, L.P. | 2052310 | 733.77K | 9.35M | Jun 30, 2026 |
| 10 | SIO CAPITAL MANAGEMENT, LLC | 1482416 | 697.41K | 2.40M | Dec 31, 2024 |
| 11 | IKARIAN CAPITAL, LLC | 1778253 | 630K | 8.03M | Jun 30, 2026 |
| 12 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 518.80K | 6.61M | Jun 30, 2026 |
| 13 | ADAGE CAPITAL PARTNERS GP, L.L.C. | 1165408 | 404.41K | 18.04M | Sep 30, 2024 |
| 14 | BLACKROCK FINANCE, INC. | 1364742 | 342.27K | 6.14M | Jun 30, 2024 |
| 15 | VANGUARD GROUP INC | 102909 | 321.05K | 1.07M | Dec 31, 2025 |
| 16 | ARCH VENTURE MANAGEMENT, LLC | 1274403 | 320.48K | 2.06M | Mar 31, 2026 |
| 17 | TEMASEK HOLDINGS (PRIVATE) LTD | 1021944 | 313.94K | 1.08M | Dec 31, 2024 |
| 18 | WOODLINE PARTNERS LP | 1784547 | 286.21K | 3.65M | Jun 30, 2026 |
| 19 | AMERICAN CENTURY COMPANIES INC | 748054 | 272.75K | 3.47M | Jun 30, 2026 |
| 20 | 5AM VENTURE MANAGEMENT, LLC | 1799883 | 251.99K | 4.52M | Jun 30, 2024 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.