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( Mark One ) ㅁ ㅁ SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 20 - F 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 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 Title of each class Commission file number : 1-13.396 TRANSPORTADORA DE GAS DEL SUR S.A. ( Exact name of Registrant as specified in its charter ) GAS TRANSPORTER OF THE SOUTH INC . ( Translation of Registrant's name into English ) Republic of Argentina ( Jurisdiction of incorporation or organization ) Don Bosco 3672 5th Floor C1206ABF City of Buenos Aires Argentina ( Address of principal executive offices ) Leandro Pérez Castaño ( 54-11 ) -4865-9077 inversores@tgs.com.ar ( Name , telephone , email and / or facsimile number of our contact person ) Securities registered or to be registered pursuant to Section 12 ( b ) of the Act : American Depositary Shares ( " ADS " ) , representing Class " B " Shares Class " B " Shares , par value Ps.1.00 per share Trading Symbol ( s ) . TGS n / a Name of each exchange on which registered New York Stock Exchange New York Stock Exchange * * Not for trading , but only in connection with the registration of American Depositary Shares related to the issuer's American Depositary Receipts ( " ADRs " ) program , pursuant to the requirements of the Securities and Exchange Commission . Securities registered or to be registered pursuant to Section 12 ( g ) of the Act : None Securities for which there is a reporting obligation pursuant to Section 15 ( d ) of the Act : None