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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 ANNUAL REPORT UNDER SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 . For the fiscal year ended December 31 , 2020 FORM 10 - K TRANSITION REPORT UNDER SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 . For the transition period from to Commission file number : 001-36335 ENSER CO Delaware ( State or other jurisdiction of incorporation or organization ) ENSERVCO CORPORATION ( Exact name of registrant as specified in its charter ) Title of each class Common stock , $ 0.005 par value 14133 County Road 9 1/2 Longmont , CO ( Address of principal executive offices ) 84-0811316 ( IRS Employer Identification No. ) Registrant's telephone number : ( 303 ) 333-3678 Securities registered pursuant to Section 12 ( b ) of the Securities Exchange Act : Ticker Symbol ENSV 80504 ( Zip Code ) 1 Name of each exchange on which registered NYSE American Securities registered pursuant to Section 12 ( g ) of the Securities Exchange 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 Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 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 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 ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes □ No