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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 Delaware ( State or other jurisdiction of incorporation or organization ) □ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from : For the fiscal year ended December 31 , 2020 Large accelerated filer Non - accelerated filer or ☐ to Commission File Number : 1-37649 ZOOM TELEPHONICS , INC . ( Exact name of registrant as specified in its charter ) 848 Elm Street , Manchester , New Hampshire 03101 ( Address of Principal Executive Office ) ( Zip Code ) ( 617 ) 423-1072 ( Registrant's telephone number , including area code ) Securities Registered Pursuant to Section 12 ( b ) of the Act : None 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 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 04-2621506 ( 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 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 . ( Check one ) : Accelerated filer Smaller reporting company Emerging growth company 0 0 0 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 financial 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 Exchange Act ) . Yes No The aggregate market value of the common stock , $ 0.01 par value , of the registrant held by non - affiliates of the registrant as of June 30 , 2020 , based upon the last sale price of such stock on that date as reported by the OTCQB Venture Market , was $ 32,538,240 . The number of shares outstanding of the registrant's common stock , $ 0.01 par value , as of March 26 , 2021 was 35,362,854 shares .