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( Mark One ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Delaware ( State or other jurisdiction of incorporation or organization ) 6000 Shoreline Court , Suite 102 South San Francisco , CA ( Address of principal executive offices ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Stock , $ 0.0001 par value per share Commission File Number 001-39370 Nkarta , Inc. ( Exact name of registrant as specified in its charter ) Non - accelerated filer ( 415 ) 582-4923 ( Registrant's telephone number , including area code ) Trading Symbol ( s ) NKTX Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . YES NO Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15 ( d ) of the Act . YES NO 47-4515206 ( I.R.S. Employer Identification No. ) 94080 ( Zip Code ) Name of each exchange on which registered The Nasdaq Stock Market LLC ( Nasdaq Global Select Market ) Indicate by check mark whether the registrant : ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . YES NO Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . YES > NO Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer Accelerated filer Smaller reporting company ■ Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . > Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . YES NO The aggregate market value of the voting and non - voting equity held by non - affiliates of the registrant , based on the closing price of a share of common stock on July 10 , 2020 as reported by The Nasdaq Stock Market on such date was approximately $ 657.5 million . The registrant has elected to use July 10 , 2020 , which was the initial trading date on The Nasdaq Stock Market , as the calculation date because on June 30 , 2020 ( the last business day of the registrant's most recently completed second fiscal quarter ) , the registrant was a privately held company . This calculation does not reflect a determination that certain persons are affiliates of the registrant for any other purpose . As of March 22 , 2021 , the number of outstanding shares of the registrant's common stock , par value $ 0.0001 per share , was 32,791,817 . DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant's Definitive Proxy Statement for the 2021 Annual Meeting of Stockholders to be filed with the U.S. Securities and Exchange Commission pursuant to Regulation 14A within 120 days after the end of the fiscal year covered by this Annual Report on Form 10 - K are incorporated by reference in Part III , Items 10-14 of this Annual Report on Form 10 - K .