Director/PDMR Shareholding

Vianet Group plc

(the "Company")

Director Share Dealing

The Company was notified on 3rd October 2012 by James Dickson, CEO of Vianet Group plc, that his pension fund purchased 260,000 ordinary shares at 100.00p each on 3rd October 2012, taking his total voting interests to 4,222,219 ordinary shares representing 15.19% of the total share capital with voting rights of the Company.

Contacts:

Enquiries:

James Dickson, Chief Executive/Mark Foster, Finance Director T: +44 (0)1642 358 800

Stephen Keys/Camilla Hume, Cenkos Securities plc T: +44 (0)20 7397 8900