Dassault Systèmes Completes the Acquisition of ABAQUS Inc. and Introduces the SIMULIA Brand

SIMULIA to create next-generation solutions for realistic 3D simulation

Paris, France, October 4, 2005 - Dassault Systémes (DS) (Nasdaq: DASTY; Euronext Paris: #13065, DSY.PA) today announced the completion of the acquisition of ABAQUS Inc., the established leader in advanced finite element analysis software. The all-cash purchase price was $413 million, before reflecting cash balances and estimated tax benefits. DS also announced that SIMULIA will be a new brand in its portfolio.

Bernard Charlés, President and CEO of Dassault Systémes, stated, "Our customers’ priority is to integrate and expand the scope of realistic simulation, in order to implement reliable and efficient workflow. Our investment in ABAQUS, as well as SIMULIA, our unified multi-physics simulation platform, enables us to offer the benefits of realistic 3D simulation to a very broad audience. Over a five-month integration period we have become well-acquainted with the impressive team of people working at ABAQUS, and are pleased to welcome them into the DS family. Mark Goldstein, currently CEO of ABAQUS, will expand his role to lead the overall SIMULIA portfolio, becoming the CEO of the new brand."

Mark Goldstein added, "We are excited about the SIMULIA vision and the opportunities ahead of us with our colleagues at Dassault Systémes. The simulation market is a vibrant one, with significant growth opportunities, as simulation is now playing an increasingly important role across multiple industry sectors. With the expanded resources now available to us, our goals are straightforward: establish ABAQUS as the undisputed market leader in finite element analysis; integrate all DS-related solutions within SIMULIA; and expand our realistic simulation ecosystem to address broad customer demands, beyond manufacturing industry sectors."

Dassault Systémes also confirmed that it will provide fourth-quarter 2005 and initial 2006 financial objectives, incorporating ABAQUS, at the time of its third-quarter financial results, scheduled for October 25, 2005.

About ABAQUS Inc.
Founded in 1978, ABAQUS, Inc. is the world's leading provider of software and services for advanced finite element analysis. The ABAQUS® software suite has an unsurpassed reputation for technology, quality and reliability. It has been adopted by major corporations across all engineering disciplines as an integral part of the design process. ABAQUS offers a powerful and complete solution for simple-to-complex linear and nonlinear engineering problems, using the finite element method. A wide range of structural, thermal, dynamic and coupled analyses is supported. The software delivers a unified simulation environment without equal, presenting a compelling alternative to implementations involving multiple products and vendors. In October 2005, ABAQUS became a wholly owned subsidiary of Dassault Systémes, a world leader in 3D and Product Lifecycle Management (PLM) solutions. ABAQUS employs over 525 people worldwide, with headquarters located in Providence, RI, USA, and R&D centers in Providence and in Suresnes, France. ABAQUS has 29 offices for technical support, sales and services, plus a network of distributors in emerging markets. (www.abaqus.com)

About Dassault Systèmes
As world leader in 3D and PLM (Product Lifecycle Management) solutions, the Dassault Systémes group brings value to more than 80,000 customers in 80 countries. A pioneer in the 3D software market since 1981, Dassault Systémes develops and markets PLM application software and services that support industrial processes and provide a 3D vision of the entire life cycle of products from conception to maintenance. Its offering includes integrated PLM solutions for product development (CATIA®, DELMIA®, ENOVIA®, SMARTEAM®), mainstream 3D design tools (SolidWorks®), and 3D components (Spatial/ACIS®). Dassault Systémes is listed on the Nasdaq (DASTY) and Euronext Paris (#13065, DSY.PA) stock exchanges. For more information, visit http://www.3ds.com

ABAQUS® is a registered trademark or trademark of ABAQUS, Inc., in the United States and other countries. All other brand names, product names or trademarks belong to their respective holders.

Dassault Systèmes Press Contacts:

Frédérique Moureton
+33 1 40 99 68 80
frederique_moureton@ds-fr.com

Emma Rutherford (Financial Dynamics)
+ 33 1 47 03 68 10
emma.rutherford@fd.com

Derek Lane (Americas)
+1(818) 673-2243
derek_lane@ds-us.com

Stacy Hart
+1 (401) 276-4403
Stacy.Hart@simulia.com

Miles Parker (Parker Group)
+1 (401) 272-1510
team@parkergroup.com

Dassault Systèmes Investor Relations Contacts:

Géraldine Nithart-Riva/Valérie Agathon
+33 1 40 99 69 24
investors@ds-fr.com