| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Gayer Charles K | President and CCO | 4505 EMPEROR BLVD., SUITE 200, DURHAM | /s/ Alane P. Barnes, by power of attorney | 16 Dec 2025 | 0001800110 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | BCRX | Common Stock | Tax liability | $61,930 | -8,181 | -1.9% | $7.57 | 418,827 | 12 Dec 2025 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | Represents shares withheld by the Issuer to satisfy required tax withholding obligations in connection with the vesting of previously granted restricted stock units. This transaction does not represent a sale by the reporting person. |