X0206 3 2021-03-24 0 0001787400 Nkarta, Inc. NKTX 0001853197 Brandenberger Ralph C/O NKARTA, INC. 6000 SHORELINE COURT, SUITE 102 SOUTH SAN FRANCISCO CA 94080 0 1 0 0 Sr. VP, Technical Operations Stock Option (right to buy) 0.41 2028-07-18 Common Stock 8727 D Stock Option (right to buy) 4.77 2029-05-10 Common Stock 10405 D Stock Option (right to buy) 3.89 2029-09-05 Common Stock 52287 D Stock Option (right to buy) 3.89 2029-09-05 Common Stock 34858 D Stock Option (right to buy) 18.00 2030-07-08 Common Stock 18480 D Stock Option (right to buy) 18.00 2030-07-08 Common Stock 17710 D Stock Option (right to buy) 54.89 2031-01-07 Common Stock 30000 D The option is vested and exercisable as to 6,271 shares, and the remaining shares will vest and become exercisable ratably in monthly installments until fully vested on April 2, 2022. The option is vested and exercisable as to 5,675 shares, and the remaining shares will vest and become exercisable ratably in monthly installments until fully vested on December 6, 2022. The option is vested and exercisable as to 18,334 shares, and the remaining shares will vest and become exercisable ratably in monthly installments until fully vested on September 5, 2023. The option is vested and exercisable as to 4,678 shares, and the remaining shares will vest and become exercisable ratably in monthly installments until fully vested on July 1, 2024. The option is vested and exercisable as to 2,480 shares, and the remaining shares will vest and become exercisable ratably in monthly installments until fully vested on July 1, 2024. The option is vested and exercisable as to 2,376 shares, and the remaining shares will vest and become exercisable ratably in monthly installments until fully vested on July 9, 2024. The option is vested and exercisable as to 1,250 shares, and the remaining shares will vest and become exercisable ratably in monthly installments until fully vested on January 8, 2025. /s/ Alicia Hager, Attorney-in-Fact for Ralph Brandenberger 2021-03-31