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✓ 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 Commission File Number 001-37824 Delaware ( State or other jur ction of incorporation or organization ) 400 Fairview Avenue North , Suite 1200 , Seattle , Washington ( Address of principal executive offices ) Common Stock , $ 0.001 par value per share ( Title of each class ) IMPINJ , INC . ( Exact name of registrant as specified in its charter ) Large accelerated filer Non - accelerated filer Emerging growth company Registrant's telephone number , including area code : ( 206 ) 517-5300 Securities registered pursuant to Section 12 ( b ) of the Act : PI oo ( Trading Symbol ) 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 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 ✓ 91-2041398 ( I.R.S. Employer Identification 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 , a 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 . 98109 ( Zip Code ) The Nasdaq Global Select Market ( Name of each exchange on which registered ) As of February 5 , 2021 , 23,403,247 of shares of common stock were outstanding . DOCUMENTS INCORPORATED BY REFERENCE Accelerated filer Smaller reporting 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 has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financing reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . □ Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes No As of June 30 , 2020 , the last business day of the Registrant's most recently completed second fiscal quarter , the aggregate market value of the Registrant's common stock held by non - affiliates based upon the closing price of such shares on The Nasdaq Global Market on such date was $ 472.3 million . The information required by Part III of this report , to the extent not set forth herein , is incorporated in this report by reference to the registrant's definitive proxy statement relating to its 2021 annual meeting of stockholders . The definitive proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant's fiscal year ended December 31 , 2020 .