Admission to listing of the OM shares on the main list of Helsinki Exchanges

Admission to listing of the OM shares on the main list of Helsinki Exchanges Helsinki Exchanges has today decided to admit to listing the shares of OM Aktiebolag ("OM") on the Helsinki Exchanges' main list, subject to the completion of OM's offer to the shareholders and warrant holders of HEX Plc ("the Offer"). Subject to completion of the Offer, the OM shares will be traded on Helsinki Exchanges under the trading code OMH1V. OM is a world leading provider of transaction technology to the financial services and energy industries. Developing and marketing IT solutions that boost the efficiency of markets worldwide, OM has over 300 customers in 20 countries. OM also owns and operates exchanges and clearing organizations and has operations in 10 countries. OM is listed on Stockholmsbörsen. For more information please visit www.om.com. For further information or comments, please contact: Jakob Håkanson, Vice President, Investor Relations +46 8 405 60 42 ------------------------------------------------------------ This information was brought to you by Waymaker http://www.waymaker.net The following files are available for download: http://www.waymaker.net/bitonline/2003/08/20/20030820BIT00870/wkr0001.pdf