EDX LONDON TO BEGIN TRADING 30 JUNE 2003 EDX London, a new equity derivatives business jointly owned by London Stock Exchange plc and OM AB, will begin trading Scandinavian equity derivatives on Monday 30 June 2003. Completion follows EDX London’s approval as a Recognised Investment Exchange by the Financial Services Authority. EDX London will pay OM a consideration of up to £24.0 million for the transfer of the Scandinavian equity derivatives business of OM London Exchange. An initial payment of £12.8 million will be paid on completion, with an additional payment of up to £11.2 million payable on achievement of certain revenue targets by EDX London by 31 December 2005. London Stock Exchange holds a 76 per cent controlling stake in the new company and OM holds a 24 per cent interest through its subsidiary Stockholmsbörsen AB. Investment in EDX London will be pro rata. For more information please contact: LSE John Wallace Media +44 (0)20 7797 1222 Paul Froud Investor Relations +44 (0)20 7797 3322 OM Anna Eriksson Media +46 (0)8 405 66 12 Jakob Håkanson Investor Relations +46 (0)8 405 60 42 Notes to editors: OM London Exchange, which will continue to own and operate UK Power Exchange (UKPX), will continue to operate as a subsidiary of OM.