| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Freire Maria C | Director | BIOGEN INC., 225 BINNEY STREET, CAMBRIDGE | /s/ Wendell Taylor, attorney-in-fact for Dr. Freire | 2025-06-18 | 0001547999 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | BIIB | Common Stock | Award | $0 | +2.37K | +53.32% | $0.00 | 6.82K | Jun 17, 2025 | Direct |