Companies / Biogen Inc.
Biogen Inc.
Financials · FY2025
Ownership
147.8M shares outstanding · as of Jul 27, 2026
Ownership
| Insiders | 0.14% | 206,782 |
| 10%+ / strategic | 6.37% | 9,413,062 |
| Institutions | 87.90% | 129,877,942 |
| Public float | 5.59% | 8,256,212 |
% of common shares outstanding (exact, from the latest cover-page filing). Institutions are quarterly 13F snapshots; insiders reflect current officers & directors.
Insiders 13
View all →| Insider | % of shares | Shares |
|---|---|---|
Alexander Susan HEVP Chief Legal Officer | 0.03% | 41,807 |
Viehbacher ChristopherCEOPresident and CEO · Director | 0.02% | 29,924 |
Rowinsky Eric KDirector | 0.02% | 25,844 |
Gregory GingerEVP, Human Resources | 0.02% | 22,359 |
Murphy NicoleHead of Pharm Ops and Tech | 0.01% | 19,611 |
Sherwin Stephen aDirector | 0.01% | 15,193 |
Kramer RobinChief Financial Officer | <0.01% | 11,472 |
Izzar RachidHead of Global Product Strat. | <0.01% | 11,011 |
Hawkins William aDirector | <0.01% | 10,365 |
Singhal PriyaHead of Development | <0.01% | 8,043 |
Institutional holders 1,006
View all →| Holder | Value | % of shares |
|---|---|---|
| $3.45B | 10.82% | |
| $3.07B | 11.81% | |
| $2.60B | 9.99% | |
| $1.66B | 6.38% | |
| $1.59B | 4.97% | |
| $793.39M | 2.94% | |
| $624.99M | 2.40% | |
| $495.09M | 1.90% | |
| $464.41M | 1.79% | |
| $409.18M | 1.57% |
Activity
InsidersInstitutions
What insiders are doing in this stock (Form 4).| Date | Actor | Action | Security | Value | Shares Δ | Position after | Impact |
|---|---|---|---|---|---|---|---|
| Feb 6, 2026 | Viehbacher Christopher CEO | Other | Common Stock | $1.33M | -7K -18.12% | 29,924 0.02% of shares | low |
| Feb 6, 2026 | Viehbacher Christopher CEO | Other | Common Stock | $876.3K | -4K -17.12% | 21,095 0.01% of shares | low |
| Feb 9, 2026 | Singhal Priya Executive | Sell | Common Stock | $531.5K | -3K -24.85% | 8,043 <0.01% of shares | medium |
| Feb 6, 2026 | Alexander Susan H Executive | Other | Common Stock | $304.6K | -2K -3.49% | 41,807 0.03% of shares | low |
| Feb 6, 2026 | Singhal Priya Executive | Other | Common Stock | $284.1K | -1K -11.65% | 10,703 <0.01% of shares | low |
| Feb 6, 2026 | Murphy Nicole Executive | Other | Common Stock | $283.3K | -1K -6.70% | 19,608 0.01% of shares | low |
| Feb 6, 2026 | Gregory Ginger Executive | Other | Common Stock | $227.7K | -1K -4.82% | 22,359 0.02% of shares | low |
| Feb 6, 2026 | Kramer Robin Executive | Other | Common Stock | $213.9K | -1K -8.48% | 11,472 <0.01% of shares | low |
5%+ ownership events
Schedule 13D / 13G
| Filer | Stance | % of class |
|---|---|---|
| Vanguard Group Inc | Passive13G/A | — |
| Fmr LLC | Passive13G | — |
Securities
via CUSIP / OpenFIGI
| Symbol | Type | CUSIP |
|---|---|---|
| BIIB | — | 09062X103 |