Sales of Shares

Costain Group PLC 22 May 2003 COSTAIN GROUP PLC Sale of Shares Costain Group PLC (the 'Company') announces that it has been notified on 21 May 2003 that one of its major shareholders, Raymond International WLL ('Raymond International') had sold 1,000,000 ordinary shares in the Company on 16 May 2003 and 500,000 ordinary shares in the Company on 19 May 2003. A spokesman for Raymond International has advised the Company that these further sales have been made in order to improve the liquidity in the Company's shares. Following this notification Raymond International's holding in the Company is 25,993,750 ordinary shares representing 7.53% of the Company's Issued Share Capital. 22 May 2003 Enquiries: Costain Group PLC Tel: 01628 842575 Clive L Franks, Company Secretary clive.franks@costain.com This information is provided by RNS The company news service from the London Stock Exchange
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