[21Vianet Group, Inc. Filed Its Annual Report on Form 20-F About 21Vianet 21Vianet Group, Inc. is a leading carrier-neutral Internet data center services provider in China. 21Vianet provides hosting and related services, managed network services, cloud services, content delivery network services, last-mile wired broadband services and business VPN services, improving the reliability, security and speed of its customers’ Internet infrastructure.] [FORM 6-K 21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road, Chaoyang District Beijing 100016 The People’s Republic of China (86 10) 8456 2121 x ¨ ¨ ¨ 21Vianet Group, Inc. By : Name : Terry Wang Title : Chief Financial Officer 6-K 1 d171116d6k.htm FORM 6-K]