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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 For the transition period from to Commission file number : 001-36204 Ontario , SF ENERGY FUELS INC . ( Exact Name of Registrant as Specified in Its Charter ) Canada ( State or other jurisdiction of incorporation or organization ) 225 Union Blvd. , Suite 600 Lakewood , Colorado ( Address of principal executive offices ) Title of each class Common shares , no par value Warrants to purchase common shares ( 303 ) 974-2140 98-1067994 ( I.R.S. Employer Identification No. ) ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) Uuuu EFR UUUU - WT 80228 ( Zip Code ) Name of each exchange on which registered NYSE American Toronto Stock Exchange NYSE American