| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| LANGER SUSAN | Director | 225 BINNEY, CAMBRIDGE | /s/ Wendell Taylor, attorney-in-fact for Susan K. Langer | 18 Jun 2025 | 0001982640 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | BIIB | Common Stock | Award | $0 | +2,370 | +86% | $0.000000 | 5,129 | 17 Jun 2025 | Direct |