| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Sievers Eric | Chief Medical Officer | C/O BIOATLA, INC. 11085 TORREYANA ROAD, SAN DIEGO | Christian Vasquez, as Attorney-in-Fact for Eric Sievers | 02 Mar 2026 | 0001835116 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | BCAB | Common Stock | Tax liability | $776 | -3,140 | -0.87% | $0.2470 | 358,705 | 28 Feb 2026 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | This transaction is not a sale of shares by the Reporting Person. Instead, this represents shares that have been withheld by the Issuer to satisfy its income tax and withholding and remittance obligations in connection with the vesting and net settlement of previously reported restricted stock units. |