Transaction in Own Shares

Rio Tinto PLC 23 April 2007 Rio Tinto plc today acquired through Credit Suisse Securities (Europe) Ltd 450,000 of its ordinary shares at an average price of 3,107.51 pence per ordinary share. The purchased shares will all be held as treasury shares. Following the above purchase, Rio Tinto plc holds 66,546,879 ordinary shares as treasury shares. The total number of ordinary shares in issue (excluding shares held as treasury shares) is 1,005,208,265. For further information, please contact: Investor Relations Nigel Jones Office: +44 (0) 20 7753 2401 Mobile: +44 (0) 7917 227 365 Secretarial Department Matthew Whyte Office: +44 (0) 20 7753 2317 Website: www.riotinto.com This information is provided by RNS The company news service from the London Stock Exchange

Companies

Rio Tinto (RIO)
UK 100

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