X0306 4 2020-07-09 0 0001787400 Nkarta, Inc. NKTX 0001601264 Dybbs Michael C/O SAMSARA BIOCAPITAL, L.P. 628 MIDDLEFIELD ROAD PALO ALTO CA 94301 1 0 0 0 Stock Option (right to buy) 18.00 2020-07-09 4 A 0 10700 0.00 A 2030-07-08 Common Stock 10700 10700 D All shares subject to the option vest 100% on the first anniversary of July 9, 2020, or, if earlier, on the day immediately preceding the first annual meeting of the Issuer's stockholders in 2021 at which one or more members of the Issuer's board of directors are to be elected. Each grant, to the extent outstanding and otherwise unvested, will become fully vest 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 Michael Dybbs 2020-07-10