Transaction in Own Shares

Spirent Communications plc: Transaction in own shares

17 May 2013

Spirent Communications plc (the "Company") announces that it has today purchased through Jefferies International Limited 1,050,000 Ordinary Shares at an average price of 133.807 pence per share. The highest price and the lowest price paid for these shares were 136.9 pence and 130.4 pence respectively.

These shares will be cancelled.

Following the purchase and cancellation of these shares the Company has 644,371,605 Ordinary Shares in issue. The Company holds no Ordinary Shares in Treasury. This figure (644,371,605) 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.