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( Mark One ) ☐ ☐ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , DC 20549 FORM 20 - F REGISTRATION STATEMENT PURSUANT TO SECTION 12 ( b ) OR 12 ( g ) OF THE SECURITIES EXCHANGE ACT OF 1934 OR 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 OR SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of event requiring this shell company report : Not applicable For the transition period from to Commission file number : 001-34848 SEANERGY MARITIME HOLDINGS CORP . ( Exact name of Registrant as specified in its charter ) ( Translation of Registrant's name into English ) Republic of the Marshall Islands ( Jurisdiction of incorporation or organization ) 154 Vouliagmenis Avenue , 166 74 Glyfada , Greece ( Address of principal executive offices ) Stamatios Tsantanis , Chairman & Chief Executive Officer Seanergy Maritime Holdings Corp. 154 Vouliagmenis Avenue , 166 74 Glyfada , Greece Telephone : +30 213 0181507 , Fax : +30 210 9638404 ( Name , Telephone , E - mail and / or Facsimile number and Address of Company Contact Person )