X0306 4 2020-07-31 0 0001496671 Calithera Biosciences, Inc. CALA 0001533228 Garland J. Scott C/O CALITHERA BIOSCIENCES, INC. 343 OYSTER POINT BLVD. #200 SOUTH SAN FRANCISCO CA 94080 1 0 0 0 Stock Option (Right to Buy) 4.70 2020-07-31 4 A 0 40000 0.00 A 2030-07-30 Common Stock 40000 40000 D 100% of the Option is initially subject to vesting pursuant to the Company's 2014 Equity Incentive Plan. The Option will vest in monthly installments as measured from 07/10/2020 over three years, until the earlier of the Option's full vesting or the reporting person ceasing to provide continuous service to the issuer. In addition, in the event of a Change in Control or a Corporate Transaction (each as defined in the plan pursuant to which the Option was granted), any unvested portion of the Option will fully vest and become exercisable as of immediately prior to the effective time of such Change in Control or Corporate Transaction, subject to the reporting person's continuous service on the effective date of such transaction. /s/ Scott Garland 2020-08-04