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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 FORM 20 - F ( Mark One ) ㅁ 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 001-37925 For the transition period from to GDS Holdings Limited ( Exact name of Registrant as specified in its charter ) Cayman Islands ( Jurisdiction of incorporation or organization ) F4 / F5 , Building C , Sunland International , No. 999 Zhouhai Road , Pudong , Shanghai 200137 People's Republic of China ( Address of principal executive offices ) Contact Person : Mr. Daniel Newman Chief Financial Officer + 86-21-2029 2200 F4 / F5 , Building C , Sunland International , No. 999 Zhouhai Road , Pudong , Shanghai 200137 People's Republic of China * ( 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 Class A ordinary shares , par value $ 0.00005 per share * American Depositary Shares , each representing eight Class A ordinary shares Trading Symbol ( s ) 9698 GDS Name of each exchange on which registered The Stock Exchange of Hong Kong Limited Nasdaq Global Market * Not for trading , but only in connection with the registration of American Depositary Shares representing such Class A ordinary shares pursuant to the requirements of the Securities and Exchange Commission .