Ticker: VNET, Company: 21Vianet Group, Inc., Type: SC 13G, Date: 2011-07-08
Original SEC Filing: Click here

---

Webplus: VNET/20110708/SC_13G/2_EX-1/000.htm SEC Original: dex1.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 dex1.htm JOINT FILING AGREEMENT

---

---

Webplus: VNET/20110708/SC_13G/3_EX-2/000.htm SEC Original: dex2.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 dex2.htm IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY

---

---

Webplus: VNET/20110708/SC_13G/4_EX-3/000.htm SEC Original: dex3.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.

---

---

Webplus: VNET/20110708/SC_13G/1/000.htm SEC Original: dsc13g.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.

---

Company Information:

Ticker: VNET, Company: 21Vianet Group, Inc., Type: SC 13G, Date: 2011-07-08CIK: 0001508475, Location: F4, SIC: 7370, SIC Desc: SERVICES-COMPUTER PROGRAMMING, DATA PROCESSING, ETC.
Business Phone & Address:
M5, 1JIUXIANQIAO EAST ROAD
Beijing 100016