Global Secondary Public Offering Pricing

DASSAULT SYSTEMES S.A. PRICES GLOBAL SECONDARY PUBLIC OFFERING

Suresnes, France – September 24, 1997 – Dassault Systèmes S.A. (Nasdaq: DASTY) announced today the global secondary offering of 3,074,284 shares of its common stock at a price of FF 380 per share, or $63.06 per American Depositary Share (each ADS represents one share). The settlement and closing of the offering is expected to take place on or about September 29, 1997. Of the 3,074,284 shares offered, 1,560,000 are being sold by IBM and 1,514,284 are being sold by certain of the former shareholders of SolidWorks Corporation, which was merged into the Company on July 25, 1997. IBM and certain of the former SolidWorks shareholders have also granted the underwriters an option to purchase up to an additional 234,000 and 225,627 shares, respectively, to cover over-allotments in connection with the offering. The Company will not receive any proceeds from the offering.

The Company’s shares are traded on the Bourse de Paris and its ADSs are quoted on the Nasdaq Stock Market’s National Market. The shares are also quoted on SEAQ International.

A final prospectus relating to these securities may be obtained in the United States from Morgan Stanley Dean Witter at 1585 Broadway, New York, New York, telephone (212) 761-6775, and in Europe from Morgan Stanley Dean Witter at 25 Cabot Square, Canary Wharf, London, telephone (44-171) 425-6101.