| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Rowinsky Eric K | Director | BIOGEN INC., 225 BINNEY STREET, CAMBRIDGE | /s/ Wendell Taylor, Attorney in Fact for Eric K. Rowinsky | 18 Jun 2025 | 0001318886 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | BIIB | Common Stock | Award | $0 | +2,370 | +11% | $0.000000 | 24,339 | 17 Jun 2025 | Direct |