Table of Contents 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, 2018. 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 SECURITI ...

21Vianet Group (NASDAQ:VNET) Q4 2018 Earnings Conference Call March 4, 2019 8:00 PM ET Company Participants Rene Jiang - IR Alvin Wang - CEO and President Sharon Liu - CFO Conference Call Participants Rex Wu - Jefferies Stella Li - Citi Yang Liu - Morgan Stanley Operator Good morning, and good evening, ladies and gentleman. Thank you, and welcome to 21Vianet Group's Fourth Quarter and Full Year 2018 Earnings Conference Call. At this time, all participants are in a listen-only mode. We will be hosting a que ...