X0306 4 2016-02-10 0 0001326110 NantKwest, Inc. NK 0001202447 POTTS JOHN T JR C/O NANTKWEST, INC. 3530 JOHN HOPKINS COURT SAN DIEGO CA 92121 1 0 0 0 Common Stock 2016-02-10 4 M 0 100000 0.2161 A 100000 D Stock Option (right to buy) 0.2161 2016-02-10 4 M 0 100000 0.00 D 2024-03-17 Common Stock 100000 270300 D Subject to the reporting person's continuing service, one twenty-fourth (1/24th) of the shares subject to the option shall vest each month on the same day as the vesting commencement date, such that the shares subject to the option shall become fully vested and exercisable on the second (2nd) anniversary of the vesting commencement date. The vesting commencement date for this option is March 17, 2014. /s/ Daniel Horwood, as Attorney-in-Fact 2016-03-17