Institutional Ownership
Biogen Inc
CUSIP 09062X103COMBIIBQ1 2026
13D / 13G Filings
28
Schedule 13D/13G on record
Beneficial Filers
8
Distinct reporting persons
Largest Stake
11.4%
Max % of class reported
Institutional Holders
985
13F filers (latest quarter)
Beneficial Owners — Schedule 13D / 13G
28 filings · latest Feb 5, 2026
| # | Filed | Reporting Person | Form | % of Class | Shares | Filing |
|---|---|---|---|---|---|---|
| 1 | Feb 5, 2026 | Fmr LLC | 13G | 6.4% | 9.41M | SEC |
| 2 | Nov 13, 2025 | Primecap Management Co/Ca/ | 13G/A | 10.2% | 14.95M | SEC |
| 3 | Nov 10, 2025 | State Street Corporation | 13G | 5.0% | 7.32M | SEC |
| 4 | Apr 17, 2025 | Blackrock, Inc. | 13G/A | 8.5% | 12.51M | SEC |
| 5 | Nov 12, 2024 | Vanguard Group Inc | 13G/A | 11.4% | 16.68M | SEC |
| 6 | Nov 4, 2024 | Vanguard Group Inc | 13G/A | 11.4% | 16.68M | SEC |
| 7 | Oct 16, 2024 | State Street Corp | 13G | 5.0% | 7.35M | SEC |
| 8 | Aug 7, 2024 | Blackrock Inc. | 13G/A | 10.1% | 14.65M | SEC |
| 9 | Feb 12, 2024 | Vanguard Group Inc | 13G/A | 10.0% | 14.52M | SEC |
| 10 | Feb 12, 2024 | Vanguard Group Inc | 13G/A | 9.9% | 14.41M | SEC |
18 more beneficial-ownership filings on Premium
See the full Schedule 13D/13G history for Biogen Inc.
Unlock full historyTop Institutional Holders (13F)
Largest reported positions · latest quarter
| # | Fund | Shares | Value |
|---|---|---|---|
| 1 | Blackrock, Inc. | 15.97M | $2.93B |
| 2 | Primecap Management Co/Ca/ | 14.76M | $2.71B |
| 3 | Fmr LLC | 12.81M | $2.35B |
| 4 | State Street Corp | 7.17M | $1.31B |
| 5 | Geode Capital Management, LLC | 4.34M | $793.39M |
| 6 | Wellington Management Group LLP | 2.96M | $542.96M |
| 7 | Morgan Stanley | 2.17M | $398.00M |
| 8 | Jpmorgan Chase & Co | 2.02M | $378.14M |
| 9 | Aqr Capital Management LLC | 1.92M | $346.24M |
| 10 | Invesco Ltd. | 1.75M | $319.96M |