BRISBANE, CA
ANNEXON, INC.ANNX— Latest position per institution from SEC 13F filings
15
Institutional holders
142.36M
Total shares held
784.37M
Estimated value
7.12M
Avg. position size
FMR LLC
CIK 315066
Shares
19.52M
Value
111.45M
Filed
Jun 30, 2026
BLACKROCK, INC.
CIK 2012383
Shares
13.54M
Value
77.31M
Filed
Jun 30, 2026
REDMILE GROUP, LLC
CIK 1425738
Shares
11.87M
Value
67.78M
Filed
Jun 30, 2026
STATE STREET CORP
CIK 93751
Shares
9.82M
Value
56.10M
Filed
Jun 30, 2026
BVF INC/IL
CIK 1056807
Shares
8.70M
Value
49.67M
Filed
Jun 30, 2026
VANGUARD GROUP INC
CIK 102909
Shares
7.75M
Value
38.92M
Filed
Dec 31, 2025
ALERCE INVESTMENT MANAGEMENT, L.P.
CIK 1844002
Shares
7.41M
Value
37.99M
Filed
Dec 31, 2024
WOODLINE PARTNERS LP
CIK 1784547
Shares
6.93M
Value
39.54M
Filed
Jun 30, 2026
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
6.87M
Value
39.23M
Filed
Jun 30, 2026
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
6.59M
Value
32.28M
Filed
Jun 30, 2024
MAK CAPITAL ONE LLC
CIK 1385702
Shares
5.86M
Value
33.47M
Filed
Jun 30, 2026
GOLDMAN SACHS GROUP INC
CIK 886982
Shares
5.83M
Value
33.26M
Filed
Jun 30, 2026
SIREN, L.L.C.
CIK 2005245
Shares
4.46M
Value
25.46M
Filed
Jun 30, 2026
BAIN CAPITAL LIFE SCIENCES INVESTORS, LLC
CIK 1703031
Shares
4.44M
Value
25.34M
Filed
Jun 30, 2026
BELLEVUE GROUP AG
CIK 1674546
Shares
4.10M
Value
23.41M
Filed
Jun 30, 2026
SIO CAPITAL MANAGEMENT, LLC
CIK 1482416
Shares
4.10M
Value
9.83M
Filed
Jun 30, 2025
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
4.04M
Value
23.06M
Filed
Jun 30, 2026
MPM BIOIMPACT LLC
CIK 1687078
Shares
3.54M
Value
20.24M
Filed
Jun 30, 2026
AMERIPRISE FINANCIAL INC
CIK 820027
Shares
3.51M
Value
20.04M
Filed
Jun 30, 2026
GREAT POINT PARTNERS LLC
CIK 1281446
Shares
3.50M
Value
19.98M
Filed
Jun 30, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | FMR LLC | 315066 | 19.52M | 111.45M | Jun 30, 2026 |
| 2 | BLACKROCK, INC. | 2012383 | 13.54M | 77.31M | Jun 30, 2026 |
| 3 | REDMILE GROUP, LLC | 1425738 | 11.87M | 67.78M | Jun 30, 2026 |
| 4 | STATE STREET CORP | 93751 | 9.82M | 56.10M | Jun 30, 2026 |
| 5 | BVF INC/IL | 1056807 | 8.70M | 49.67M | Jun 30, 2026 |
| 6 | VANGUARD GROUP INC | 102909 | 7.75M | 38.92M | Dec 31, 2025 |
| 7 | ALERCE INVESTMENT MANAGEMENT, L.P. | 1844002 | 7.41M | 37.99M | Dec 31, 2024 |
| 8 | WOODLINE PARTNERS LP | 1784547 | 6.93M | 39.54M | Jun 30, 2026 |
| 9 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 6.87M | 39.23M | Jun 30, 2026 |
| 10 | BLACKROCK FINANCE, INC. | 1364742 | 6.59M | 32.28M | Jun 30, 2024 |
| 11 | MAK CAPITAL ONE LLC | 1385702 | 5.86M | 33.47M | Jun 30, 2026 |
| 12 | GOLDMAN SACHS GROUP INC | 886982 | 5.83M | 33.26M | Jun 30, 2026 |
| 13 | SIREN, L.L.C. | 2005245 | 4.46M | 25.46M | Jun 30, 2026 |
| 14 | BAIN CAPITAL LIFE SCIENCES INVESTORS, LLC | 1703031 | 4.44M | 25.34M | Jun 30, 2026 |
| 15 | BELLEVUE GROUP AG | 1674546 | 4.10M | 23.41M | Jun 30, 2026 |
| 16 | SIO CAPITAL MANAGEMENT, LLC | 1482416 | 4.10M | 9.83M | Jun 30, 2025 |
| 17 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 4.04M | 23.06M | Jun 30, 2026 |
| 18 | MPM BIOIMPACT LLC | 1687078 | 3.54M | 20.24M | Jun 30, 2026 |
| 19 | AMERIPRISE FINANCIAL INC | 820027 | 3.51M | 20.04M | Jun 30, 2026 |
| 20 | GREAT POINT PARTNERS LLC | 1281446 | 3.50M | 19.98M | Jun 30, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.