Chorion PLC 20 May 2005 Chorion plc ("Chorion" or the "Company") Holding in Company The Company was informed on 18 May 2005 by M&G Investments that Prudential plc and certain of its subsidiary companies together have a notifiable interest in 1,062,555 ordinary shares of 30 pence each in Chorion ("Ordinary Shares"), representing approximately 4.16 per cent. of the Company's issued ordinary share capital. These holdings are registered as follows: Registered Holder No. of Ordinary % Issued Share ------------------- Shares Capital ------------------------- ------------------------ PRUCLT HSBC GIS Nom(UK) PAC AC 1,062,512 4.16% Prudential Holborn Pensions Ltd 43 - -------------- -------------- Total 1,062,555 4.16% ============== ============== 20 May 2005 This information is provided by RNS The company news service from the London Stock Exchange