Ticker: VNET, Company: 21Vianet Group, Inc., Type: SC 13G/A, Date: 2013-02-07
Original SEC Filing: Click here

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Webplus: VNET/20130207/SC_13G.A/2_EX-1/000.htm SEC Original: d477786dex1.htm
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

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Webplus: VNET/20130207/SC_13G.A/3_EX-2/000.htm SEC Original: d477786dex2.htm
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

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Webplus: VNET/20130207/SC_13G.A/4_EX-3/000.htm SEC Original: d477786dex3.htm
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.

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Webplus: VNET/20130207/SC_13G.A/1/000.htm SEC Original: d477786dsc13ga.htm
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.

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Company Information:

Ticker: VNET, Company: 21Vianet Group, Inc., Type: SC 13G/A, Date: 2013-02-07CIK: 0001508475, Location: F4, SIC: 7370, SIC Desc: SERVICES-COMPUTER PROGRAMMING, DATA PROCESSING, ETC.
Business Phone & Address:
M5, 1JIUXIANQIAO EAST ROAD
Beijing 100016