X0306 4 2016-12-23 0 0001326110 NantKwest, Inc. NK 0001434575 Tajak Richard J. C/O NANTKWEST, INC. 3530 JOHN HOPKINS COURT SAN DIEGO CA 92121 0 1 0 0 Chief Financial Officer Common Stock 2016-12-23 4 M 0 5000 0.00 A 11575 D Common Stock 2016-12-23 4 F 0 1717 6.15 D 9858 D Restricted Stock Units 2016-12-23 4 M 0 5000 0.00 D Common Stock 5000 5000 D Each restricted stock unit ("RSU") represents a contingent right to receive one share of NantKwest, Inc. common stock. Subject to the reporting person's continuing to be a Service Provider (as defined in the 2015 Equity Incentive Plan) through each applicable vesting date, the restricted stock units ("RSUs") will vest as follows: 1/4th of the RSUs subject to the award shall vest 3 months following the vesting commencement date on the same day of the month as the vesting commencement date, and 1/4th of the RSUs subject to the award shall vest every 3 months thereafter on the same day of the month as the vesting commencement date such that the award shall be fully vested on March 23, 2017. The vesting commencement date for this award is March 23, 2016. /s/ Daniel Horwood, as Attorney-in-Fact 2016-12-28