Certain Class B Common Stock of BioAtla, Inc. are subject to a Lock-Up Agreement Ending on 14-JUN-2021. These Class B Common Stock will be under lockup for 181 days starting from 15-DEC-2020 to 14-JUN-2021. Details: The directors and executive officers, and substantially all of its shareholders have agreed they will not, subject to certain exceptions offer, sell, contract to sell, pledge or otherwise dispose of, directly or indirectly, any shares of capital stock or any securities convertible into, or exercisable or exchangeable for such capital stock, or publicly announce an intention to effect any such transaction, whether any transaction is to be settled by delivery of its common stock or such other securities, in cash or otherwise during the period ending 180 days after the date of this prospectus, without the prior written consent of J.P. Morgan Securities LLC, Jefferies LLC and Credit Suisse Securities (USA) LLC.