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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 X ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from Delaware ( State or other jurisdiction of incorporation or organization ) 75 Castilian Drive Goleta , California ( Address of principal executive offices ) Title of Each Class N / A FORM 10 - K Act . Yes No > Securities registered pursuant to Section 12 ( b ) of the Act : Commission file number : 000-55832 transphorm Transphorm , Inc. ( Exact name of registrant as specified in its charter ) ( 805 ) 456-1300 ( Registrant's telephone number , including area code ) to Trading Symbol ( s ) N / A 82-1858829 1 ( I.R.S. Employer Identification No. ) 93117 ( Zip Code ) Securities registered pursuant to Section 12 ( g ) of the Act : Common Stock , $ 0.0001 par value Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities per share Name of Each Exchange on Which Registered N / A 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