X0306 4 2021-03-30 0 0001787400 Nkarta, Inc. NKTX 0001309702 HASTINGS PAUL J C/O NKARTA, INC. 6000 SHORELINE COURT, SUITE 102 SOUTH SAN FRANCISCO CA 94080 1 1 0 0 Chief Executive Officer Common Stock 2021-03-30 2021-03-30 4 S 0 11461 30.23 D 241600 D Common Stock 2021-03-30 2021-03-30 4 S 0 2409 31.24 D 239191 D Common Stock 2021-03-30 2021-03-30 4 S 0 3130 32.21 D 236061 D The transactions reported in this Form 4 were effected automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person at least 90 days prior to the trading date. This transaction was executed in multiple trades at prices ranging from $30.00 to $30.89. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed in multiple trades at prices ranging from $31.05 to $31.96. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed in multiple trades at prices ranging from $32.00 to $32.83. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. Includes 42,427 shares acquired upon early exercise of an option, which are subject to forfeiture until they vest. /s/ Alicia Hager, as Attorney-in-Fact 2021-03-31