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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 20 - F ( Mark One ) ☐ 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 Commission file number : 001-3132734 TERNIUM S.A. ( Exact name of Registrant as specified in its charter ) N / A ( Translation of Registrant's name into English ) Grand Duchy of Luxembourg ( Jurisdiction of incorporation or organization ) 26 , Boulevard Royal- 4th floor L - 2449 Luxembourg ( Address of principal executive offices ) Alejandra Hryszkiewicz 26 , Boulevard Royal , 4th floor L - 2449 Luxembourg Tel . +352 26 68 31 52 , Fax . +352 26 53 83 49 , e - mail : luxembourg@ternium.com ( 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 American Depositary Shares Ordinary Shares , par value $ 1.00 per share Trading Symbol ( s ) TX TX Name of Each Exchange On Which Registered New York Stock Exchange New York Stock Exchange *