X0306 4 2018-08-27 0 0001326110 NantKwest, Inc. NK 0001647994 Simon Barry J. C/O NANTKWEST, INC. 3530 JOHN HOPKINS COURT SAN DIEGO CA 92121 1 1 0 0 See remarks Stock Option (right to buy) 3.07 2018-08-27 4 A 0 200000 0.00 A 2028-08-27 Common Stock 200000 200000 D Subject to the award recipient's continuing to be a Service Provider (as defined in the 2015 Equity Incentive Plan) through each applicable vesting date, the option shall vest as follows: twenty five percent (25%) of the shares subject to the option shall vest and become exercisable on August 27, 2019, and thereafter the remaining shares subject to the option shall vest and become exercisable in equal monthly installments over thirty six (36) months, such that the option will be fully vested and exercisable on August 27, 2022. President and Chief Administrative Officer /s/ Charles Kim, as Attorney-in-Fact 2018-08-28