Exhibit 32.1
CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER PURSUANT TO 18 U.S.C. § 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANESOXLEY ACT OF 2002
I, Patrick Soon-Shiong, the chief executive officer of NantKwest, Inc. (the “Company”), certify for the purposes of 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:
| i. | the Quarterly Report of the Company on Form 10-Q for the quarter ended June 30, 2017 (the “Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and |
| ii. | the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. |
Date: August 7, 2017 | By: |
| /s/ Patrick Soon-Shiong |
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| Patrick Soon-Shiong |
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| Chief Executive Officer |