VNET [21Vianet] SC 13D/A: JOINT FILING STATEMENT Dated: October 29, 2013 GRANITE

[JOINT FILING STATEMENT Dated: October 29, 2013 GRANITE GLOBAL VENTURES III L.P. GGV III ENTREPRENEURS FUND L.P. ITS: GENERAL PARTNER Hany M. Nada Managing Director GRANITE GLOBAL VENTURES III L.L.C. Hany M. Nada Managing Director Hany M. Nada as Attorney-in-fact for Scott B. Bonham Hany M. Nada Hany M. Nada as Attorney-in-fact for Thomas K. Ng Hany M. Nada as] [CUSIP No. 90138A 10 3 13D Page 2 1. Name of Reporting Persons Granite Global Ventures III L.P. 2. Check the Appropriate Box if a Member of a Group (see instructions) ¨ (b) x (1) (a) 3. SEC USE ONLY 4. Source of Funds (see instructions) WC 5.]

VNET [21Vianet] SC 13D: EXECUTION VERSION PURCHASE AGREEMENT dated as of September

[EXECUTION VERSION PURCHASE AGREEMENT dated as of September 30, 2013 among 21VIANET GROUP, INC., THE SELLERS NAMED HEREIN and ESTA INVESTMENTS PTE LTD TABLE OF CONTENTS ARTICLE 1 Definitions . Definitions Section 1.01 1 . Other Definitional And Interpretive Provisions Section 1.02 5 ARTICLE 2 Sale And Purchase Of The Sale Shares . Agreement to Sell and Purchase Section 2.01] [EXECUTION VERSION INVESTOR RIGHTS AGREEMENT dated as of October 11, 2013 among 21VIANET GROUP, INC., ESTA INVESTMENTS PTE LTD and CERTAIN OTHER PARTIES NAMED HEREIN TABLE OF CONTENTS ARTICLE 1 Definitions . Definitions Section 1.01 1 . Other Definitional and Interpretative Provisions Section 1.02 3 ARTICLE 2 Corporate Governance . Investor Nominee Director Section 2.01 4 . Board and Committee] [EXECUTION VERSION th Dated this 11 21VIANET GROUP, INC. REGISTRATION RIGHTS AGREEMENT TABLE OF CONTENTS Page ARTICLE 1 Definitions ARTICLE 2 Registration Rights Section 2.01. Demand Registration Rights 3 Section 2.02. Piggyback Registration Rights 5 Section 2.03. Form F-3 Registration 7 Section 2.04. 8 Section 2.05. Information From Investor 10] [JOINT FILING AGREEMENT provided This Joint Filing Agreement may be executed in any number of counterparts all of which together shall constitute one and the same instrument. th ESTA INVESTMENTS PTE. LTD. Rohit Sipahimalani Authorised Signatory TEMBUSU CAPITAL PTE. LTD. Chia Yue Joo Director TEMASEK HOLDINGS (PRIVATE) LIMITED Rohit Sipahimalani Authorised Signatory] [CUSIP No. 90138A996 1.]

VNET [21Vianet] 6-K: (Original Filing)

[21Vianet Group, Inc. Appoints President of Microsoft Cloud Operation October 10, 2013 — 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 has appointed Mr. Wing-Dar Ker, a 19-year Microsoft veteran, as President of Microsoft Cloud Operation effective immediately. Most recently Mr. Ker] [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 d611506d6k.htm FORM 6-K]

VNET [21Vianet] 6-K: 21Vianet Group, Inc. Appoints President of Microsoft Cloud

[21Vianet Group, Inc. Appoints President of Microsoft Cloud Operation October 10, 2013 — 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 has appointed Mr. Wing-Dar Ker, a 19-year Microsoft veteran, as President of Microsoft Cloud Operation effective immediately. Most recently Mr. Ker] [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 d611506d6k.htm FORM 6-K]

VNET [21Vianet] 6-K: (Original Filing)

[21VIANET ANNOUNCES US$100 MILLION INVESTMENT FROM TEMASEK BEIJING “We welcome Temasek’s investment in our Company and believe that its deep expertise in Asia’s telecom industry will significantly benefit 21Vianet going forward,” said Mr. Josh Chen, co-founder, chairman and chief executive officer of 21Vianet. “With this investment from one of the most reputable investment companies in Asia, 21Vianet can better leverage] [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 d608402d6k.htm FORM 6-K]

VNET [21Vianet] 6-K: 21VIANET ANNOUNCES US$100 MILLION INVESTMENT FROM TEMASEK BEIJING

[21VIANET ANNOUNCES US$100 MILLION INVESTMENT FROM TEMASEK BEIJING “We welcome Temasek’s investment in our Company and believe that its deep expertise in Asia’s telecom industry will significantly benefit 21Vianet going forward,” said Mr. Josh Chen, co-founder, chairman and chief executive officer of 21Vianet. “With this investment from one of the most reputable investment companies in Asia, 21Vianet can better leverage] [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 d608402d6k.htm FORM 6-K]

VNET [21Vianet] 6-K: (Original Filing)

[21Vianet Announces US$10 Million Share Repurchase Program BEIJING, China, September 5, 2013—21Vianet Group, Inc. (NASDAQ: VNET), the largest carrier-neutral Internet data center services provider in China (“21Vianet” or the “Company”), today announced that its board of directors has authorized a US$10 million share repurchase program. 21Vianet’s board of directors will review the share repurchase program periodically, and may authorize adjustment] [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 President and Chief Financial Officer 6-K 1 d596176d6k.htm FORM 6-K]

VNET [21Vianet] 6-K: 21Vianet Announces US$10 Million Share Repurchase Program BEIJING,

[21Vianet Announces US$10 Million Share Repurchase Program BEIJING, China, September 5, 2013—21Vianet Group, Inc. (NASDAQ: VNET), the largest carrier-neutral Internet data center services provider in China (“21Vianet” or the “Company”), today announced that its board of directors has authorized a US$10 million share repurchase program. 21Vianet’s board of directors will review the share repurchase program periodically, and may authorize adjustment] [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 President and Chief Financial Officer 6-K 1 d596176d6k.htm FORM 6-K]

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