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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 For the transition period from to 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 Commission file number 001-33283 EUROSEAS LTD . ( Exact name of Registrant as specified in its charter ) Not applicable ( Translation of Registrant's name into English ) Republic of the Marshall Islands ( Jurisdiction of incorporation or organization ) 4 Messogiou & Evropis Street , 151 24 Maroussi Greece ( Address of principal executive offices ) Tasos Aslidis , Tel : ( 908 ) 301-9091 , euroseas@euroseas.gr , Euroseas Ltd. c / o Tasos Aslidis , 11 Canterbury Lane , Watchung , NJ 07069 ( Name , Telephone , E - mail and / or Facsimile number and Address of Company Contact Person ) Securities registered or to be registered pursuant to Section 12 ( b ) of the Act : Title of each class Common shares , $ 0.03 par value Trading Symbol ( s ) . ESEA Name of each exchange on which registered Nasdaq Capital Market