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Table of Contents ( Mark One ) 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 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31 , 2020 FORM 10 - K TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF Title of each class N / A OR For the transition period from to DELAWARE ( State or other jurisdiction of incorporation or organization ) COMMISSION FILE NUMBER 0-20201 101 EAST PARK BLVD , SUITE 1300 PLANO , TEXAS ( Address of principal executive offices ) Intrusion Inc. ( Exact name of registrant as specified in its charter ) 75-1911917 ( I.R.S. Employer Identification No. ) Registrant's telephone number , including area code : ( 972 ) 234-6400 Securities registered pursuant to Section 12 ( b ) of the Act : 75074 ( Zip Code ) Name of each exchange on which registered N / A Securities registered pursuant to Section 12 ( g ) of the Act : Common Stock , $ 0.01 par value ( Title of class ) 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 Exchange 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 Exchange Act during the past 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 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 .