VÉLIZY-VILLACOUBLAY, France — — Dassault Systèmes (Euronext

Paris: #13065, DSY.PA), the 3DEXPERIENCE Company, world leader in 3D design

software, 3D Digital Mock Up and Product Lifecycle Management (PLM) solutions

announces the completion of its acquisition of Accelrys, Inc. (NASDAQ: ACCL)

(Accelrys). After the previously announced completion of the tender offer by its wholly

owned indirect subsidiary, 3DS Acquisition Corp., to purchase all of the outstanding

shares of Accelrys common stock at an offer price of $12.50 per share in cash, without

interest and subject to any required withholding of taxes, Dassault Systèmes completed

the acquisition of Accelrys through a merger under Section 251(h) of the General

Corporation Law of the State of Delaware.

At the effective time of the merger and subject to perfected appraisal rights, all remaining

shares of Accelrys common stock not tendered into the tender offer and not owned by

Accelrys, 3DS Acquisition Corp. or Dassault Systemes Americas Corp. were canceled

and converted into the right to receive $12.50 per share in cash, without interest and

subject to any required withholding of taxes, which is the same price that was paid in the

tender offer. Shares of Accelrys common stock will no longer be listed on the NASDAQ

Global Select Market.

About Dassault Systèmes

Dassault Systèmes, the 3DEXPERIENCE Company, provides business and people with

virtual universes to imagine sustainable innovations. Its world-leading solutions

transform the way products are designed, produced, and supported. Dassault Systèmes’

collaborative solutions foster social innovation, expanding possibilities for the virtual

world to improve the real world. The group brings value to over 190,000 customers of all

sizes, in all industries, in more than 140 countries.

CATIA, SOLIDWORKS, SIMULIA, DELMIA, ENOVIA, GEOVIA, EXALEAD, NETVIBES,

3DSWYM and 3DVIA are registered trademarks of Dassault Systèmes or its subsidiaries

in the US and/or other countries.

Dassault Systèmes Investor Relations Contacts:

Corporate F-J BORDONADO/ B. MARTINEZ

North America Michele KATZ 3DSTenderoffer-Accelrys@3DS.COM

Dassault Systèmes Press Contact:

North America Elena FERNANDEZ

elena.fernandez@3ds.com +1 (978) 442-2790