CAMBRIDGE, MA
BIOGEN INC.BIIB— Latest position per institution from SEC 13F filings
15
Institutional holders
130.69M
Total shares held
27.76B
Estimated value
6.53M
Avg. position size
FMR LLC
CIK 315066
Shares
18.22M
Value
3.94B
Filed
Jun 30, 2026
VANGUARD GROUP INC
CIK 102909
Shares
17.45M
Value
3.07B
Filed
Dec 31, 2025
BLACKROCK, INC.
CIK 2012383
Shares
15.99M
Value
3.45B
Filed
Jun 30, 2026
PRIMECAP MANAGEMENT CO/CA/
CIK 763212
Shares
15.15M
Value
3.27B
Filed
Jun 30, 2026
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
14.54M
Value
3.37B
Filed
Jun 30, 2024
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
9.65M
Value
2.09B
Filed
Jun 30, 2026
STATE STREET CORP
CIK 93751
Shares
7.34M
Value
1.59B
Filed
Jun 30, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
CIK 2100121
Shares
6.60M
Value
1.43B
Filed
Jun 30, 2026
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
4.45M
Value
957.94M
Filed
Jun 30, 2026
WELLINGTON MANAGEMENT GROUP LLP
CIK 902219
Shares
3.12M
Value
673.56M
Filed
Jun 30, 2026
NORGES BANK
CIK 1374170
Shares
2.58M
Value
557.44M
Filed
Jun 30, 2026
MORGAN STANLEY
CIK 895421
Shares
2.41M
Value
520.98M
Filed
Jun 30, 2026
AQR CAPITAL MANAGEMENT LLC
CIK 1167557
Shares
1.94M
Value
416.93M
Filed
Jun 30, 2026
JPMORGAN CHASE & CO
CIK 19617
Shares
1.82M
Value
394.95M
Filed
Jun 30, 2026
INVESCO LTD.
CIK 914208
Shares
1.80M
Value
389.76M
Filed
Jun 30, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 1446194
Shares
1.65M
Value
355.99M
Filed
Jun 30, 2026
UBS GROUP AG
CIK 1610520
Shares
1.53M
Value
331.30M
Filed
Jun 30, 2026
AMUNDI
CIK 1330387
Shares
1.52M
Value
327.73M
Filed
Jun 30, 2026
LEGAL & GENERAL GROUP PLC
CIK 764068
Shares
1.49M
Value
322.64M
Filed
Jun 30, 2026
NORTHERN TRUST CORP
CIK 73124
Shares
1.43M
Value
308.86M
Filed
Jun 30, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | FMR LLC | 315066 | 18.22M | 3.94B | Jun 30, 2026 |
| 2 | VANGUARD GROUP INC | 102909 | 17.45M | 3.07B | Dec 31, 2025 |
| 3 | BLACKROCK, INC. | 2012383 | 15.99M | 3.45B | Jun 30, 2026 |
| 4 | PRIMECAP MANAGEMENT CO/CA/ | 763212 | 15.15M | 3.27B | Jun 30, 2026 |
| 5 | BLACKROCK FINANCE, INC. | 1364742 | 14.54M | 3.37B | Jun 30, 2024 |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 9.65M | 2.09B | Jun 30, 2026 |
| 7 | STATE STREET CORP | 93751 | 7.34M | 1.59B | Jun 30, 2026 |
| 8 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2100121 | 6.60M | 1.43B | Jun 30, 2026 |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 4.45M | 957.94M | Jun 30, 2026 |
| 10 | WELLINGTON MANAGEMENT GROUP LLP | 902219 | 3.12M | 673.56M | Jun 30, 2026 |
| 11 | NORGES BANK | 1374170 | 2.58M | 557.44M | Jun 30, 2026 |
| 12 | MORGAN STANLEY | 895421 | 2.41M | 520.98M | Jun 30, 2026 |
| 13 | AQR CAPITAL MANAGEMENT LLC | 1167557 | 1.94M | 416.93M | Jun 30, 2026 |
| 14 | JPMORGAN CHASE & CO | 19617 | 1.82M | 394.95M | Jun 30, 2026 |
| 15 | INVESCO LTD. | 914208 | 1.80M | 389.76M | Jun 30, 2026 |
| 16 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 1446194 | 1.65M | 355.99M | Jun 30, 2026 |
| 17 | UBS GROUP AG | 1610520 | 1.53M | 331.30M | Jun 30, 2026 |
| 18 | AMUNDI | 1330387 | 1.52M | 327.73M | Jun 30, 2026 |
| 19 | LEGAL & GENERAL GROUP PLC | 764068 | 1.49M | 322.64M | Jun 30, 2026 |
| 20 | NORTHERN TRUST CORP | 73124 | 1.43M | 308.86M | Jun 30, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.