| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Mantas Jesus B | Director | BIOGEN INC., 225 BINNEY ST., CAMBRIDGE | /s/ Wendell Taylor, Attorney in Fact for Jesus B. Mantas | 18 Jun 2025 | 0001777331 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | BIIB | Common Stock | Award | $0 | +2,370 | +32% | $0.000000 | 9,758 | 17 Jun 2025 | Direct |