[21VIANET GROUP, INC. Incorporated as a limited liability company under the laws of the Cayman Islands) Announcement of Results of the Meeting of Bondholders with Respect to the Proposed Extraordinary Resolutions relating to its 7.875% Bonds Due 2016 21Vianet Company Bondholders Meeting of Bondholders Notice Beijing, June 30, 2014—21Vianet Group, Inc. (NASDAQ: VNET) (“ Results of the Meeting The Company] [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. Shang-Wen Hsiao Chief Financial Officer 6-K 1 d749659d6k.htm FORM 6-K]

[21Vianet Group, Inc. Announces the Pricing of RMB2 Billion Bonds Interest on the Bonds is payable semi-annually in arrears on, or nearest to, June 26 and December 26 in each year, commencing on December 26, 2014. The Bonds are not rated. The Company has received approval in principal for the Bonds to be listed and quoted on the Official List] [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. Shang-Wen Hsiao Chief Financial Officer 6-K 1 d744601d6k.htm FORM 6-K]

[21Vianet Group, Inc. Appoints New Independent Director BEIJING, June 10, 2014 – 21Vianet Group, Inc. (NASDAQ: VNET) (“21Vianet” or the “Company”), the largest carrier-neutral Internet data center services provider in China, today announced that its Board of Directors (the “Board”) has appointed Dr. Eden Y. Woon as an Independent Director, effective immediately. Dr. Eden Y. Woon is currently Vice-President for] [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. Shang-Wen Hsiao Chief Financial Officer 6-K 1 d741539d6k.htm FORM 6-K]

[21Vianet Group, Inc. to Invest in Aipu BEIJING, June 4, 2014 – 21Vianet Group, Inc. (NASDAQ: VNET) (“21Vianet” or the “Company”), the largest carrier-neutral Internet data center services provider in China, today announced that the Company and its affiliate have entered into definitive agreements to invest in Sichuan Aipu Network Co., Ltd. and its affiliates (collectively, the “Aipu Group”). Headquartered] [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. Shang-Wen Hsiao Chief Financial Officer 6-K 1 d741537d6k.htm FORM 6-K]