Transaction in Own Shares

Spirent Communications PLC 18 September 2006 Spirent Communications Plc Transaction in Own Shares Spirent Communications PLC announces that it has today purchased through Citigroup Global Markets U.K. Equity Limited 1,000,000 ordinary shares at an average price of 48.68 pence per share. The highest price and the lowest price paid for these shares were 49.0 pence and 48.5 pence respectively. Following the above purchase, Spirent Communications plc holds 61,840,000 Spirent Communications plc ordinary shares in treasury, and has 910,215,762 Spirent Communications plc ordinary shares in issue (excluding treasury shares). This information is provided by RNS The company news service from the London Stock Exchange POSUWABRNSRKAAR
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