VNET [21Vianet] S-8: (Original Filing)

[] [DEPOSIT AGREEMENT DEPOSIT AGREEMENT W I T N E S S E T H T H A T WHEREAS WHEREAS WHEREAS WHEREAS WHEREAS, NOW, THEREFORE ARTICLE I DEFINITIONS All capitalized terms used, but not otherwise defined, herein shall have the meanings set forth below, unless otherwise clearly indicated: ADS Record Date Section 1.1 “ 1 Affiliate Section 1.2 “ Section] [Our Ref VZL\653749\4680361v2 Direct tel +852 2971 3046 Email richard.spoooner@maplesandcalder.com 21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road, Chaoyang District, Beijing 100016 People’s Republic of China 13 October 2011 Dear Sirs 21Vianet Group, Inc. Company Registration Statement” Shares Plan We have examined the Registration Statement on Form S-8 to be filed by 21Vianet Group, Inc., a Cayman Islands exempted company] [Consent of Independent Registered Public Accounting Firm Ernst & Young Hua Ming Shanghai, People’s Republic of China October 13, 2011 EX-23.1 4 d242811dex231.htm CONSENT OF ERNST & YOUNG HUA MING]

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

[JOINT FILING STATEMENT Dated: August 19, 2011 GRANITE GLOBAL VENTURES III L.P. 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 Attorney-in-fact for Jixun Foo Hany M. Nada as] [CUSIP No. 90138A 10 3 1 NAMES OF REPORTING PERSONS 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) o (a) þ (b) 3 SEC USE ONLY 4 SOURCE OF FUNDS (SEE INSTRUCTIONS) WC 5]

VNET [21Vianet] SC 13D: JOINT FILING STATEMENT Dated: August 19, 2011 GRANITE

[JOINT FILING STATEMENT Dated: August 19, 2011 GRANITE GLOBAL VENTURES III L.P. 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 Attorney-in-fact for Jixun Foo Hany M. Nada as] [CUSIP No. 90138A 10 3 1 NAMES OF REPORTING PERSONS 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) o (a) þ (b) 3 SEC USE ONLY 4 SOURCE OF FUNDS (SEE INSTRUCTIONS) WC 5]

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

[JOINT FILING AGREEMENT nd day of February, 2007. Waddell & Reed Financial, Inc. Waddell & Reed Financial Services, Inc. Waddell & Reed, Inc. Waddell & Reed Investment Management Company Ivy Investment Management Company EX-1 2 dex1.htm JOINT FILING AGREEMENT] [Waddell & Reed Investment Management Company – Tax ID No. 48-1106973 Investment Advisor registered under Section 203 of the Investment Advisors Act of 1940 Ivy Investment Management Company – Tax ID No. 03-0481447 Investment Advisor registered under Section 203 of the Investment Advisors Act of 1940 EX-2 3 dex2.htm IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY] [POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, THAT: IN WITNESS WHEREOF th day of November, 2010. Waddell & Reed Financial, Inc. Henry J. Herrmann Chief Executive Officer Attest: Wendy J. Hills Secretary POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, THAT: IN WITNESS WHEREOF th day of November, 2010. Waddell & Reed Financial Services, Inc. Henry J.] [CUSIP No. 90138A103 13G 1. NAME OF REPORTING PERSON Ivy Investment Management Company Tax ID No. 03-0481447 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: ¨ (a) ¨ (b) 3.]

VNET [21Vianet] SC 13G: JOINT FILING AGREEMENT nd day of February, 2007.

[JOINT FILING AGREEMENT nd day of February, 2007. Waddell & Reed Financial, Inc. Waddell & Reed Financial Services, Inc. Waddell & Reed, Inc. Waddell & Reed Investment Management Company Ivy Investment Management Company EX-1 2 dex1.htm JOINT FILING AGREEMENT] [Waddell & Reed Investment Management Company – Tax ID No. 48-1106973 Investment Advisor registered under Section 203 of the Investment Advisors Act of 1940 Ivy Investment Management Company – Tax ID No. 03-0481447 Investment Advisor registered under Section 203 of the Investment Advisors Act of 1940 EX-2 3 dex2.htm IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY] [POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, THAT: IN WITNESS WHEREOF th day of November, 2010. Waddell & Reed Financial, Inc. Henry J. Herrmann Chief Executive Officer Attest: Wendy J. Hills Secretary POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, THAT: IN WITNESS WHEREOF th day of November, 2010. Waddell & Reed Financial Services, Inc. Henry J.] [CUSIP No. 90138A103 13G 1. NAME OF REPORTING PERSON Ivy Investment Management Company Tax ID No. 03-0481447 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: ¨ (a) ¨ (b) 3.]

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