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 commence trading Scandinavian equity derivatives on Monday 30 June 2003. Completion of this deal follows EDX London’s approval as a Recognised Investment Exchange by the Financial Services Authority. See also today’s joint press release on www.om.com. The completion of EDX London will have an expected positive net income effect for OM of approximately SEK 100 m, which will be accounted for in the second quarter of 2003. Additional positive net income effect for OM of a maximum of SEK 100 m will be accounted for in 2006, depending upon development of transaction volumes. In addition to OM receiving future earnings from its 24 per cent ownership in EDX London, Stockholmsbörsen will receive an annual contribution from EDX London's future revenues from Swedish derivatives, starting in January 2006. EDX London will pay OM a consideration of up to £24.0 million (SEK 329 m) for the transfer of the Scandinavian equity derivatives business of OM London Exchange. An initial payment of £12.8 million (SEK 180 m (1) ) will be paid on completion, with an additional payment of up to £11.2 million (SEK 149 m (2) ) payable on achievement of certain revenue targets by EDX London by 31 December 2005. The amendment of terms, in relation to what was originally announced, is a result of lower transaction volumes within OM London Exchange during the first five months of 2003. OM and LSE will in proportion to its holdings (OM 24 per cent and LSE 76 per cent) capitalise EDX London. Assuming the same revenue and cost levels for OM London Exchange's Scandinavian equity derivatives business as in the first quarter of 2003, the effect on OM's operating profit is expected to be neutral. This estimation excludes the capital gain from the transaction. For further information and comments, please contact: Jakob Håkanson, VP, Investor Relations +46 (0)8 405 60 42 Anna Eriksson, VP, Corporate Communications +46 (0)8 405 66 12 1) OM has a currency hedge at SEK/GBP 14.08 related to the transaction. 2) At SEK/GBP 13.28 as of June 26, 2003.