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( 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 For the fiscal year ended December 31 , 2020 FORM 10 - K COMMUNICATIONS SYSTEMS , INC . ( Exact name of registrant as specified in its charter ) Title of each class Commission File Number : 001-31588 Minnesota ( State or other jurisdiction of incorporation or organization ) Registrant's telephone number , including area code : ( 952 ) 996-1674 Securities registered pursuant to Section 12 ( b ) of the Act : 10900 Red Circle Drive , Minnetonka , MN 55343 ( Address of principal executive offices and zip code ) Large Accelerated Filer Smaller Reporting Company Trading Symbol 41-0957999 Common Stock , $ .05 par value Preferred Stock Purchase Rights 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 X JCS ( Federal Employer Identification 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 Accelerated Filer Emerging Growth Company 0 Name of each exchange on which registered NASDAQ 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 , 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 . Non - Accelerated Filer > Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . YES NO 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 . □