Page 1

☐ ☑ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20509 Form 20 - F ( Mark One ) REGISTRATION STATEMENT PURSUANT TO SECTION 12 ( b ) OR ( 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_ For the transition period from_ to Commission file number : 001-36487 Atlantica Sustainable Infrastructure plc ( Exact name of Registrant as specified in its charter ) Not applicable ( Translation of Registrant's name into English ) England and Wales ( Jurisdiction of incorporation or organization ) Great West House , GW1 , 17th floor Great West Road Brentford , United Kingdom TW8 9DF Tel : +44 203 499 0465 ( Address of principal executive offices ) Santiago Seage Great West House , GW1 , 17th floor Great West Road Brentford , United Kingdom TW8 9DF Tel : +44 203 499 0465 ( 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 Ordinary Shares , nominal value $ 0.10 per share Trading Symbol AY Name of each exchange on which registered NASDAQ Global Select Market