X0306 4 2022-06-16 0 0001826892 BioAtla, Inc. BCAB 0001261974 GRAY MARY ANN C/O BIOATLA, INC. 11085 TORREYANA ROAD SAN DIEGO CA 92121 1 0 0 0 Stock Option (right to buy) 2.48 2022-06-16 4 A 0 20000 0.00 A 2032-06-16 Common Stock 20000 20000 D 100% of the total number of shares subject to the option shall vest and become exercisable on the earlier of (a) June 16, 2023 or (b) the next annual meeting of stockholders, subject to the reporting person continuing to provide services through the vesting date. /s/ Christian Vasquez, as Attorney-in-Fact for Mary Ann Gray 2022-06-17