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| Date | Name | Title | Action | No Shares | Price Per Share |
|---|---|---|---|---|---|
Insider Transactions For BIIB | |||||
| 2026-09-01 | Parini, Michael | Chief Legal Officer | Purchased | 7405 | $0.00 |
| 2026-08-04 | Minor, Lloyd | Director | Sold | 593 | $200.96 |
| 2026-08-03 | Minor, Lloyd | Director | Sold | 593 | $203.34 |
| 2026-06-09 | Langer, Susan | Director | Purchased | 1505 | $0.00 |
| 2026-06-09 | Pangalos, Menelas N | Director | Purchased | 1505 | $0.00 |
| 2026-06-09 | Pangalos, Menelas N | Director | Purchased | 2370 | $0.00 |
| 2026-06-09 | Patolawala, Monish D | Director | Purchased | 1505 | $0.00 |
| 2026-06-09 | Freire, Maria C | Director | Purchased | 2005 | $0.00 |
| 2026-06-09 | Minor, Lloyd | Director | Purchased | 1505 | $0.00 |
| 2026-06-09 | Mantas, Jesus B | Director | Purchased | 1505 | $0.00 |
| 2026-06-09 | Rowinsky, Eric K | Director | Purchased | 1505 | $0.00 |
| 2026-06-09 | Pangalos, Menelas N | Director | Sold | 2370 | $0.00 |
| 2026-06-09 | Sherwin, Stephen A | Director | Purchased | 1505 | $0.00 |
| 2026-06-09 | Hawkins, William A | Director | Purchased | 1505 | $0.00 |
| 2026-05-01 | Keeney, Adam | Head of Corporate Development | Sold | 455 | $187.06 |
| 2026-05-01 | Keeney, Adam | Head of Corporate Development | Sold | 939 | $0.00 |
| 2026-05-01 | Keeney, Adam | Head of Corporate Development | Purchased | 939 | $0.00 |
| 2026-04-01 | Godbout, Sean | Chief Accounting Officer | Purchased | 181 | $0.00 |
| 2026-04-01 | Godbout, Sean | Chief Accounting Officer | Sold | 54 | $183.78 |
| 2026-04-01 | Godbout, Sean | Chief Accounting Officer | Sold | 181 | $0.00 |
