Director/PDMR Shareholding

Vianet Group plc

(the "Company")

Holding(s) in Company

The Company was notified on 15th December 2014 by Chris Williams, Non-Executive Director Vianet Group plc, that his wife Maria Williams purchased 5,000 ordinary shares at 71p each, taking his total voting interests together with his wife to 9,250 ordinary shares representing 0.03% of the total share capital with voting rights of the Company.

Contacts:

Enquiries:

James Dickson, Executive Chairman/Mark Foster, Chief Financial Officer

T: +44 (0)1642 358 800

Stephen Keys/Callum Davidson,

Cenkos Securities plc T: +44 (0)20 7397 8900