| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| SHERWIN STEPHEN A | Director | BIOGEN INC., 225 BINNEY STREET, CAMBRIDGE | /s/ Wendell Taylor, Attorney in Fact for Stephen Sherwin | 18 Jun 2025 | 0001079462 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | BIIB | Common Stock | Award | $0 | +2,370 | +21% | $0.000000 | 13,688 | 17 Jun 2025 | Direct |