Biogen Inc. (BIIB) Insider Trading
Over the last 3 months, BIIB insiders made 0 open-market buys and 1 sale, a net sale of -$121K (SEC Form 4). Over the last 6 months, 819 institutions increased and 611 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
1
Net (3m)
-$120.6K
Insider trades by month Buys Sells
Mar
May
Jul
Sep
Feb
Aug
Context3-month price +11.4%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Aug 5, 2026 | Minor Lloyddirector | Sell | 593 | $203.34 |
| Jun 11, 2026 | HAWKINS WILLIAM Adirector | Grant | 1,505 | — |
| Jun 11, 2026 | Mantas Jesus Bdirector | Grant | 1,505 | — |
| Jun 11, 2026 | Freire Maria Cdirector | Grant | 2,005 | — |
| Jun 11, 2026 | Patolawala Monish Ddirector | Grant | 1,505 | — |
| Jun 11, 2026 | Pangalos Menelas Ndirector | Option | 2,370 | — |
| Jun 11, 2026 | SHERWIN STEPHEN Adirector | Grant | 1,505 | — |
| Jun 11, 2026 | Rowinsky Eric Kdirector | Grant | 1,505 | — |
| Jun 11, 2026 | Pangalos Menelas Ndirector | Grant | 1,505 | — |
| Jun 11, 2026 | Minor Lloyddirector | Grant | 1,505 | — |
| Jun 11, 2026 | LANGER SUSANdirector | Grant | 1,505 | — |
| May 5, 2026 | Keeney Adamofficer: Head of Corporate Development | Option | 939 | — |
| May 5, 2026 | Keeney Adamofficer: Head of Corporate Development | Tax | 455 | $187.06 |
| Apr 3, 2026 | Godbout Seanofficer: Chief Accounting Officer | Tax | 54 | $183.78 |
| Apr 3, 2026 | Godbout Seanofficer: Chief Accounting Officer | Option | 181 | — |
| Feb 17, 2026 | Kramer Robinofficer: Chief Financial Officer | Grant | 8,450 | — |
| Feb 17, 2026 | Singhal Priyaofficer: Head of Development | Grant | 10,560 | — |
| Feb 17, 2026 | Keeney Adamofficer: Head of Corporate Development | Grant | 8,025 | — |
| Feb 17, 2026 | Godbout Seanofficer: Chief Accounting Officer | Grant | 1,800 | — |
| Feb 17, 2026 | Murphy Nicoleofficer: Head of Pharm Ops and Tech | Grant | 10,560 | — |
| Feb 17, 2026 | Gregory Gingerofficer: EVP, Human Resources | Grant | 8,025 | — |
| Feb 17, 2026 | ALEXANDER SUSAN Hofficer: EVP Chief Legal Officer | Grant | 8,450 | — |
| Feb 17, 2026 | Grogan Janeofficer: Head of Research | Grant | 8,450 | — |
| Feb 17, 2026 | Murphy Nicoleofficer: Head of Pharm Ops and Tech | Buy | 3 | $195.03 |
| Feb 17, 2026 | Viehbacher Christopherdirector, officer: President and CEO | Grant | 38,015 | — |
| Feb 17, 2026 | Izzar Rachidofficer: Head of Global Product Strat. | Grant | 7,390 | — |
| Feb 10, 2026 | ALEXANDER SUSAN Hofficer: EVP Chief Legal Officer | Option | 4,916 | — |
| Feb 10, 2026 | Viehbacher Christopherdirector, officer: President and CEO | Option | 9,008 | — |
| Feb 10, 2026 | Godbout Seanofficer: Chief Accounting Officer | Option | 257 | — |
| Feb 10, 2026 | ALEXANDER SUSAN Hofficer: EVP Chief Legal Officer | Option | 1,940 | — |
Source: BIIB SEC Form 4 filings, latest Aug 5, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their BIIB positions over the last 6 months (SEC Form 13F).
Increased
819
New positions
267
Reduced
611
Sold out
85
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| FMR LLC | Increased | 18.2M | Aug 13, 2026 |
| BlackRock, Inc. | Increased | 16.0M | Aug 7, 2026 |
| BLACKROCK, INC. | Increased | 16.0M | May 13, 2026 |
| PRIMECAP MANAGEMENT CO/CA/ | Increased | 15.2M | Aug 14, 2026 |
| PRIMECAP MANAGEMENT CO/CA/ | Reduced | 14.8M | May 11, 2026 |
| FMR LLC | Increased | 12.8M | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 9.7M | Aug 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 9.5M | May 15, 2026 |
| STATE STREET CORP | Increased | 7.3M | Aug 7, 2026 |
| STATE STREET CORP | Increased | 7.2M | May 15, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 6.6M | Aug 13, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 6.5M | May 8, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 4.4M | Aug 12, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 4.3M | May 15, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Increased | 3.1M | Aug 14, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.