Transaction in Own Shares

Spirent Communications plc: Transaction in own shares

6 January 2012

Spirent Communications plc (the "Company") announces that on 5 January 2012 it purchased through UBS Limited 1,000,000 Ordinary Shares at an average price of 115.0 pence per share. The highest price and the lowest price paid for these shares was 115.0 pence.

These shares will be cancelled.

Following the purchase and cancellation of these shares the Company has 663,047,878 Ordinary Shares in issue. The Company holds no Ordinary Shares in Treasury. This figure (663,047,878) represents the total voting rights in the Company and may be used by shareholders as the denominator for the calculations by which they can determine if they are required to notify their interest in, or a change to their interest in, the Company under the Financial Services Authority's Disclosure and Transparency Rules. Any such notifications should be sent by fax to +44 1293 767990 or by email to [email protected] marked for the attention of the Company Secretary.