| 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 | 18 Jun 2025 | 0001547999 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | BIIB | Common Stock | Award | $0 | +2,370 | +53% | $0.000000 | 6,815 | 17 Jun 2025 | Direct |