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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FORM 10 - K 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 Act Yes For the transition period from Commission file number : 001-35980 nanoString Delaware ( State or other jurisdiction of incorporation or organization ) to NANOSTRING TECHNOLOGIES , INC . ( Exact name of registrant as specified in its charter ) Title of Each Class Common Stock , $ 0.0001 par value per share 20-0094687 ( I.R.S. Employer Identification Number ) 530 Fairview Avenue North Seattle , Washington 98109 ( Address of principal executive offices ) ( 206 ) 378-6266 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) NSTG Name of Exchange on Which Registered The NASDAQ Stock Market LLC ( The NASDAQ Global Market ) 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 ý No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the No ý 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 ý 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 during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes ý No