VNET [21Vianet] SC 13G: (Name of Issuer) Common Stock (Title of Class

[(Name of Issuer) Common Stock (Title of Class of Securities) (CUSIP Number) December 31, 2014 (Date of Event Which Requires Filing of this Statement) [X] Rule 13d-1(b) [ ] Rule 13d-1(c) [ ] Rule 13d-1(d) * CUSIP No. 1. NAMES OF REPORTING PERSONS 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP 3. SEC USE ONLY 4. CITIZENSHIP]

VNET [21Vianet] SC 13G: (Original Filing)

[(Name of Issuer) Common Stock (Title of Class of Securities) (CUSIP Number) December 31, 2014 (Date of Event Which Requires Filing of this Statement) [X] Rule 13d-1(b) [ ] Rule 13d-1(c) [ ] Rule 13d-1(d) * CUSIP No. 1. NAMES OF REPORTING PERSONS 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP 3. SEC USE ONLY 4. CITIZENSHIP]

VNET [21Vianet] SC 13G/A: (Original Filing)

[Schedule 13G Forms 13G CUSIP No. 90138A103 Page 2 of 6 Pages 1. Name of reporting persons I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) GIC Private Limited ) (None 2. Check the appropriate box if a member of a group* ¨ x (a) 3. SEC use only 4. Citizenship or place of organization]

VNET [21Vianet] SC 13G/A: Schedule 13G Forms 13G CUSIP No. 90138A103 Page

[Schedule 13G Forms 13G CUSIP No. 90138A103 Page 2 of 6 Pages 1. Name of reporting persons I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) GIC Private Limited ) (None 2. Check the appropriate box if a member of a group* ¨ x (a) 3. SEC use only 4. Citizenship or place of organization]

VNET [21Vianet] SC 13D/A: (Original Filing)

[AMENDMENT NO. 1 TO PURCHASE AGREEMENT Amendment Agreement Company This AMENDMENT NO. 1, dated as of January 28, 2015 (this “ RECITALS: Section 9.07 WHEREAS, the parties to the Agreement now desire to amend the Agreement in accordance with Definitions Section 1.02 1. Amendment Schedule 3.03(A) 2. Company Capitalization As of December 1, 2014 Immediately Prior to Closing Total Issued] []

VNET [21Vianet] SC 13D/A: AMENDMENT NO. 1 TO PURCHASE AGREEMENT Amendment Agreement

[AMENDMENT NO. 1 TO PURCHASE AGREEMENT Amendment Agreement Company This AMENDMENT NO. 1, dated as of January 28, 2015 (this “ RECITALS: Section 9.07 WHEREAS, the parties to the Agreement now desire to amend the Agreement in accordance with Definitions Section 1.02 1. Amendment Schedule 3.03(A) 2. Company Capitalization As of December 1, 2014 Immediately Prior to Closing Total Issued] []

VNET [21Vianet] SC 13D: (Original Filing)

[AGREEMENT OF JOINT FILING Dated: January 15, 2015 KING VENTURE HOLDINGS LIMITED KINGSOFT CORPORATION LIMITED] [EXECUTION VERSION PURCHASE AGREEMENT dated as of November 29, 2014 among 21VIANET GROUP, INC., KING VENTURE HOLDINGS LIMITED and CERTAIN OTHER PARTIES NAMED HEREIN TABLE OF CONTENTS Article 1 Definitions Section 1.01 Definitions 1 Section 1.02 Other Definitional And Interpretive Provisions 5 Article 2 Sale And Purchase Of The Sale Securities Section 2.01 Agreement to Sell and Purchase 6 Section] [EXECUTION VERSION AMENDMENT NO. 1 TO PURCHASE AGREEMENT Amendment Agreement Company This AMENDMENT NO. 1, dated as of January 15, 2015 (this “ RECITALS: Section 10.07 WHEREAS, the parties to the Agreement now desire to amend the Agreement in accordance with Definitions Section 1.02 1. Amendment Schedule 3.03(A) 2. Company Capitalization Prior to the Closing Total Class A Shares 346,803,765] [EXECUTION VERSION INVESTOR RIGHTS AGREEMENT dated as of January 15, 2015 among 21VIANET GROUP, INC., KING VENTURE HOLDINGS LIMITED, XIAOMI VENTURES LIMITED and CERTAIN OTHER PARTIES NAMED HEREIN TABLE OF CONTENTS ARTICLE 1 Definitions Section 1.01 . Definitions 1 Section 1.02 . Other Definitional and Interpretative Provisions 5 ARTICLE 2 Corporate Governance Section 2.01 . Investor Nominee Director 6 Section] [EXECUTION VERSION th Dated this 15 21VIANET GROUP, INC. __________________________ REGISTRATION RIGHTS AGREEMENT TABLE OF CONTENTS Page ARTICLE 1 Definitions 1 ARTICLE 2 Registration Rights 4 Section 2.01. Demand Registration Rights 4 Section 2.02. Piggyback Registration Rights 5 Section 2.03. Form F-3 Registration 7 Section 2.04. 8 Section 2.05. Information From Investors] [(Name of Issuer) Class A Ordinary Shares, Par Value $0.00001 (Title of Class of Securities) 90138A103 (CUSIP Number) Francis Ng King Venture Holdings Limited Kingsoft Tower No. 33 Xiaoying West Road Haidian District, Beijing 100085 The People’s Republic of China Telephone: +(86) 10 82325515 With a copy to: Z. Julie Gao, Esq. Skadden, Arps, Slate, Meagher & Flom LLP 42/F,]

VNET [21Vianet] SC 13D: AGREEMENT OF JOINT FILING Dated: January 15, 2015

[AGREEMENT OF JOINT FILING Dated: January 15, 2015 KING VENTURE HOLDINGS LIMITED KINGSOFT CORPORATION LIMITED] [EXECUTION VERSION PURCHASE AGREEMENT dated as of November 29, 2014 among 21VIANET GROUP, INC., KING VENTURE HOLDINGS LIMITED and CERTAIN OTHER PARTIES NAMED HEREIN TABLE OF CONTENTS Article 1 Definitions Section 1.01 Definitions 1 Section 1.02 Other Definitional And Interpretive Provisions 5 Article 2 Sale And Purchase Of The Sale Securities Section 2.01 Agreement to Sell and Purchase 6 Section] [EXECUTION VERSION AMENDMENT NO. 1 TO PURCHASE AGREEMENT Amendment Agreement Company This AMENDMENT NO. 1, dated as of January 15, 2015 (this “ RECITALS: Section 10.07 WHEREAS, the parties to the Agreement now desire to amend the Agreement in accordance with Definitions Section 1.02 1. Amendment Schedule 3.03(A) 2. Company Capitalization Prior to the Closing Total Class A Shares 346,803,765] [EXECUTION VERSION INVESTOR RIGHTS AGREEMENT dated as of January 15, 2015 among 21VIANET GROUP, INC., KING VENTURE HOLDINGS LIMITED, XIAOMI VENTURES LIMITED and CERTAIN OTHER PARTIES NAMED HEREIN TABLE OF CONTENTS ARTICLE 1 Definitions Section 1.01 . Definitions 1 Section 1.02 . Other Definitional and Interpretative Provisions 5 ARTICLE 2 Corporate Governance Section 2.01 . Investor Nominee Director 6 Section] [EXECUTION VERSION th Dated this 15 21VIANET GROUP, INC. __________________________ REGISTRATION RIGHTS AGREEMENT TABLE OF CONTENTS Page ARTICLE 1 Definitions 1 ARTICLE 2 Registration Rights 4 Section 2.01. Demand Registration Rights 4 Section 2.02. Piggyback Registration Rights 5 Section 2.03. Form F-3 Registration 7 Section 2.04. 8 Section 2.05. Information From Investors] [(Name of Issuer) Class A Ordinary Shares, Par Value $0.00001 (Title of Class of Securities) 90138A103 (CUSIP Number) Francis Ng King Venture Holdings Limited Kingsoft Tower No. 33 Xiaoying West Road Haidian District, Beijing 100085 The People’s Republic of China Telephone: +(86) 10 82325515 With a copy to: Z. Julie Gao, Esq. Skadden, Arps, Slate, Meagher & Flom LLP 42/F,]

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