WALTHAM, MA
ZENAS BIOPHARMA, INC.ZBIO— Latest position per institution from SEC 13F filings
15
Institutional holders
48.51M
Total shares held
1.03B
Estimated value
2.43M
Avg. position size
FMR LLC
CIK 315066
Shares
9.08M
Value
177.55M
Filed
Mar 31, 2026
SR ONE CAPITAL MANAGEMENT, LP
CIK 1910264
Shares
5.04M
Value
98.49M
Filed
Mar 31, 2026
NEA MANAGEMENT COMPANY, LLC
CIK 1512848
Shares
4.02M
Value
78.65M
Filed
Mar 31, 2026
ENAVATE SCIENCES GP, LLC
CIK 1953107
Shares
3.92M
Value
76.62M
Filed
Mar 31, 2026
FEDERATED HERMES, INC.
CIK 1056288
Shares
3.13M
Value
61.13M
Filed
Mar 31, 2026
POLAR CAPITAL HOLDINGS PLC
CIK 1837309
Shares
2.55M
Value
49.82M
Filed
Mar 31, 2026
CAPITAL INTERNATIONAL INVESTORS
CIK 1562230
Shares
2.43M
Value
47.58M
Filed
Mar 31, 2026
FAIRMOUNT FUNDS MANAGEMENT LLC
CIK 1802528
Shares
2.36M
Value
46.12M
Filed
Mar 31, 2026
BLACKROCK, INC.
CIK 2012383
Shares
2.04M
Value
39.83M
Filed
Mar 31, 2026
NVP ASSOCIATES, LLC
CIK 1545692
Shares
1.84M
Value
35.94M
Filed
Mar 31, 2026
DEERFIELD MANAGEMENT COMPANY, L.P.
CIK 1009258
Shares
1.56M
Value
34.70M
Filed
Sep 30, 2025
STATE STREET CORP
CIK 93751
Shares
1.47M
Value
28.76M
Filed
Mar 31, 2026
VANGUARD GROUP INC
CIK 102909
Shares
1.45M
Value
52.76M
Filed
Dec 31, 2025
NOVO HOLDINGS A/S
CIK 1388325
Shares
1.45M
Value
52.65M
Filed
Dec 31, 2025
WELLINGTON MANAGEMENT GROUP LLP
CIK 902219
Shares
1.25M
Value
24.36M
Filed
Mar 31, 2026
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
1.25M
Value
24.35M
Filed
Mar 31, 2026
SILVERARC CAPITAL MANAGEMENT, LLC
CIK 1816307
Shares
1.14M
Value
22.21M
Filed
Mar 31, 2026
ALLIANCEBERNSTEIN L.P.
CIK 1109448
Shares
897.32K
Value
32.58M
Filed
Mar 31, 2026
VIVO CAPITAL, LLC
CIK 1674712
Shares
853.50K
Value
30.99M
Filed
Dec 31, 2025
ECOR1 CAPITAL, LLC
CIK 1587114
Shares
789.50K
Value
15.43M
Filed
Mar 31, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | FMR LLC | 315066 | 9.08M | 177.55M | Mar 31, 2026 |
| 2 | SR ONE CAPITAL MANAGEMENT, LP | 1910264 | 5.04M | 98.49M | Mar 31, 2026 |
| 3 | NEA MANAGEMENT COMPANY, LLC | 1512848 | 4.02M | 78.65M | Mar 31, 2026 |
| 4 | ENAVATE SCIENCES GP, LLC | 1953107 | 3.92M | 76.62M | Mar 31, 2026 |
| 5 | FEDERATED HERMES, INC. | 1056288 | 3.13M | 61.13M | Mar 31, 2026 |
| 6 | POLAR CAPITAL HOLDINGS PLC | 1837309 | 2.55M | 49.82M | Mar 31, 2026 |
| 7 | CAPITAL INTERNATIONAL INVESTORS | 1562230 | 2.43M | 47.58M | Mar 31, 2026 |
| 8 | FAIRMOUNT FUNDS MANAGEMENT LLC | 1802528 | 2.36M | 46.12M | Mar 31, 2026 |
| 9 | BLACKROCK, INC. | 2012383 | 2.04M | 39.83M | Mar 31, 2026 |
| 10 | NVP ASSOCIATES, LLC | 1545692 | 1.84M | 35.94M | Mar 31, 2026 |
| 11 | DEERFIELD MANAGEMENT COMPANY, L.P. | 1009258 | 1.56M | 34.70M | Sep 30, 2025 |
| 12 | STATE STREET CORP | 93751 | 1.47M | 28.76M | Mar 31, 2026 |
| 13 | VANGUARD GROUP INC | 102909 | 1.45M | 52.76M | Dec 31, 2025 |
| 14 | NOVO HOLDINGS A/S | 1388325 | 1.45M | 52.65M | Dec 31, 2025 |
| 15 | WELLINGTON MANAGEMENT GROUP LLP | 902219 | 1.25M | 24.36M | Mar 31, 2026 |
| 16 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 1.25M | 24.35M | Mar 31, 2026 |
| 17 | SILVERARC CAPITAL MANAGEMENT, LLC | 1816307 | 1.14M | 22.21M | Mar 31, 2026 |
| 18 | ALLIANCEBERNSTEIN L.P. | 1109448 | 897.32K | 32.58M | Mar 31, 2026 |
| 19 | VIVO CAPITAL, LLC | 1674712 | 853.50K | 30.99M | Dec 31, 2025 |
| 20 | ECOR1 CAPITAL, LLC | 1587114 | 789.50K | 15.43M | Mar 31, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.