Transaction in Own Shares

AMEC plc

21 September 2012

Repurchase of shares in AMEC plc

On 21 February 2012, AMEC plc (the "Company") announced that it intended to complete a £400 million share buyback programme within the next twelve months.

Further to the announcement on 17 August 2012 of its irrevocable, non-discretionary share repurchase programme with Barclays Capital Securities Limited, the Company announces that under the terms of that programme it has today purchased for cancellation 50,000 ordinary shares of the Company at a price of 1160.2662 pence per share. This purchase equates to approximately 0.02 per cent of AMEC's current issued share capital excluding Treasury shares prior to this purchase.

Following this change AMEC's total issued share capital is 317,853,250 ordinary shares, of which 6,349,833 are registered as Treasury Shares, leaving a balance of 311,503,417 shares with voting rights.

Cumulative purchases since 21 February 2012 amount to approximately £241.34 million. It is the Company's intention that the significant majority of the shares purchased under the £400 million share buyback programme will be cancelled.

Enquiries to:

AMEC plc +44 (0)20 7539 5800

Sue Scholes - Director of Communications

Nicola-Jane Brooks - Head of Investor Relations

AMEC (LSE: AMEC) is a focused supplier of consultancy, engineering and project management services to its customers in the world's oil and gas, minerals and metals, clean energy, environment and infrastructure markets. With annual revenues of some £3.3 billion, AMEC designs, delivers and maintains strategic and complex assets and employs over 29,000 people in around 40 countries worldwide. See amec.com.