[21Vianet Announces US$388 Million Investment From Tus-Holdings BEIJING, May 23, 2016–21Vianet Group, Inc. (Nasdaq: VNET) (“21Vianet” or the “Company”), a leading carrier-neutral internet data center services provider in China, announced today that Tus-Holdings Co., Ltd. (“Tus-Holdings”), a large integrated enterprise established in reliance on Tsinghua University, has, through its affiliated investment vehicle, entered into definitive share subscription agreement (“Share Subscription] [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 ¨ Form 20-F 21Vianet Group, Inc. By : Terry Wang Chief Financial Officer 6-K 1 d109483d6k.htm FORM 6-K]