Dassault Systèmes:Declaration of the Number of Outstanding Shares and Voting Rights as of May 31, 2009

VÉLIZY-VILLACOUBLAY, France--(Business Wire)--
Regulatory News:

Dassault Systèmes (DS) (Paris:DSY) (NASDAQ:DASTY) (Euronext Paris: #13065,
DSY.PA) 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 May 31, 2009.

Number of Outstanding Shares: 117 875 591

Number of Voting Rights: 142 130 500

*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

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

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