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

[Joint Filing Agreement [Remainder of this page has been left intentionally blank.] Sheng Chen Sheng Chen Fast Horse Technology Limited Sheng Chen Director Sunrise Corporate Holding Ltd. Sheng Chen] [1 Name Of Reporting Person Sheng Chen 2 Check the Appropriate Box if a Member of a Group ¨ ¨ (a) 3 SEC Use Only 4 Citizenship or Place of Organization The People’s Republic of China Number of Shares Beneficially Owned by Each]

VNET [21Vianet] SC 13G/A: Joint Filing Agreement [Remainder of this page has

[Joint Filing Agreement [Remainder of this page has been left intentionally blank.] Sheng Chen Sheng Chen Fast Horse Technology Limited Sheng Chen Director Sunrise Corporate Holding Ltd. Sheng Chen] [1 Name Of Reporting Person Sheng Chen 2 Check the Appropriate Box if a Member of a Group ¨ ¨ (a) 3 SEC Use Only 4 Citizenship or Place of Organization The People’s Republic of China Number of Shares Beneficially Owned by Each]

BIDU [Baidu] SC 13G/A: (Original Filing)

[Joint Filing Agreement [Remainder of this page has been left intentionally blank.] Robin Yanhong Li Robin Yanhong Li Handsome Reward Limited EX-99.(A) 2 d484941dex99a.htm EX-99.(A)] [CUSIP No. G07034104 13G Page 2 of 8 Pages 1 Name of Reporting Person Robin Yanhong Li 2 Check the Appropriate Box if a Member of a Group ¨ ¨ (a)]

BIDU [Baidu] SC 13G/A: Joint Filing Agreement [Remainder of this page has

[Joint Filing Agreement [Remainder of this page has been left intentionally blank.] Robin Yanhong Li Robin Yanhong Li Handsome Reward Limited EX-99.(A) 2 d484941dex99a.htm EX-99.(A)] [CUSIP No. G07034104 13G Page 2 of 8 Pages 1 Name of Reporting Person Robin Yanhong Li 2 Check the Appropriate Box if a Member of a Group ¨ ¨ (a)]

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

[CUSIP No. 90138A103 13G Page 2 of 15 Pages 1 NAMES OF REPORTING PERSONS/I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Cisco Systems International B.V. ( “CSIBV” ) 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP ¨ x (a) 3]

VNET [21Vianet] SC 13G/A: CUSIP No. 90138A103 13G Page 2 of 15

[CUSIP No. 90138A103 13G Page 2 of 15 Pages 1 NAMES OF REPORTING PERSONS/I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Cisco Systems International B.V. ( “CSIBV” ) 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP ¨ x (a) 3]

VNET [21Vianet] SC 13G/A: (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 d477786dex1.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 d477786dex2.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. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH 5. SOLE VOTING POWER 6.]

VNET [21Vianet] SC 13G/A: 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 d477786dex1.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 d477786dex2.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. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH 5. SOLE VOTING POWER 6.]

BIDU [Baidu] SC 13G/A: (Original Filing)

[1. Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only). Baillie Gifford & Co (Scottish partnership) _______________________________________________________________________ 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a).................................................................... (b).................................................................... _______________________________________________________________________ 3. SEC Use Only _______________________________________________________________________ 4. Citizenship or Place of Organization SCOTLAND UK _______________________________________________________________________ Number of 5. Sole Voting Power 1690882 Shares Bene ______________________________________________________]

BIDU [Baidu] SC 13G/A: 1. Names of Reporting Persons. I.R.S. Identification Nos.

[1. Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only). Baillie Gifford & Co (Scottish partnership) _______________________________________________________________________ 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a).................................................................... (b).................................................................... _______________________________________________________________________ 3. SEC Use Only _______________________________________________________________________ 4. Citizenship or Place of Organization SCOTLAND UK _______________________________________________________________________ Number of 5. Sole Voting Power 1690882 Shares Bene ______________________________________________________]

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