X0306 4 2020-07-09 0 0001787400 Nkarta, Inc. NKTX 0001816676 Rajangam Kanya C/O NKARTA, INC. 6000 SHORELINE COURT, SUITE 102 SOUTH SAN FRANCISCO CA 94080 0 1 0 0 Chief Medical Officer Stock Option (right to buy) 18.00 2020-07-09 4 A 0 70600 0.00 A 2030-07-08 Common Stock 70600 70600 D This option vests and becomes exercisable in 48 equal monthly installments occurring on the completion of each successive month of the Reporting Person's service to the Issuer following July 9, 2020. Each grant, to the extent outstanding and otherwise unvested, will become fully vested should a "change in control" of the Issuer occur (as described in the applicable award agreement) or upon the Reporting Person's separation from service with the Issuer due to the Reporting Person's death or "disability" (as described in the applicable award agreement). /s/ Matthew Plunkett, Attorney-in-Fact for Kanya Rajangam 2020-07-10