PARIS, FRANCE, April 29, 2004 – Dassault Systèmes (DS) (Nasdaq: DASTY; Euronext Paris: #13065, DSY.PA), a worldwide leading software developer of product lifecycle management (PLM) solutions, reported financial results for the first quarter ended March 31, 2004. First Quarter Financial Highlights: Total revenue €176.2 million, up 4% as reported and up 10% in constant currencies; Software revenue €148.9 million, up 3% as reported and up 9% in constant currencies; PDM revenue up 15% as reported and 22% in constant currencies; Design-centric revenue up 7% as reported (up 25% in U.S. dollars); Operating margin 24.3% and EPS €0.24 on U.S. GAAP Basis; EPS excluding acquisition costs up 19% to €0.25 per diluted share in the 2004 first quarter on 3 percentage point operating margin improvement to 24.7% before acquisitions costs.