Regulatory News:

Dassault Systèmes (DS) (Paris:DSY) reported today the total number of its outstanding shares and voting rights, according to articles 223-16 et 221-3 of the General Regulation of the Autorité des Marchés Financiers as of February 28, 2010.

Number of Outstanding Shares: 118 426 012

Number of Voting Rights: 148 227 177

*The total number of voting rights was calculated on the basis of the total number of outstanding shares, even if the voting rights attached thereto are suspended, pursuant to Article 223-11 of the General Regulation of the Autorité des Marchés Financiers relating to the method for calculating the percentages of holdings in shares and in voting rights. We invite our shareholders to refer to such article should they need to declare acquisitions or dispositions of shares that cross specific thresholds.

Declarations related to crossing of threshold shall be sent to:

Dassault Systèmes, Service Investors Relations, 10, rue Marcel Dassault, CS 40501, 78946 Vélizy-Villacoublay Cedex (France). E-mail address: Investors@3ds.com

Contacts:

Dassault Systèmes/Investors Relations:
François-José Bordonado/Béatrix Martinez
+ 33 1 61 62 69 24