Release Details

CAMBRIDGE, Mass.--(BUSINESS WIRE)--Oct. 5, 2005-- Aspen Technology, Inc. (Nasdaq: AZPN) today announced that Reliance Industries Limited (RIL), India's largest private company, has signed a license agreement to significantly expand its use of the Aspen Plus steady-state modeling application. The licenses will be distributed at various sites throughout RIL's network of petrochemical plants and at its petroleum refinery, and the product will form the cornerstone for all of RIL's engineering software applications. The agreement also provides for multi-year renewal of maintenance services for existing licenses of Aspen Plus and Aspen HYSYS(R).

The expansion of its Aspen Plus license will help RIL move towards the adoption of a corporate standard simulation platform and to streamline its engineering efforts. It will also provide opportunities to follow the industry trend of leveraging process models in applications beyond off-line engineering, such as in integrated engineering, on-line performance monitoring and on-line optimization.

"We look forward to further developing our longstanding relationship with RIL through the expansion of its Aspen Plus license," said Blair Wheeler, Senior Vice President, Marketing, AspenTech. "Recognizing the importance of standardization for success in today's competitive markets, we are committed to helping RIL achieve its vision of leveraging standardized process models for improved operational and business decision-making."

In addition to its use of Aspen Plus and Aspen HYSYS, RIL currently licenses several other AspenTech applications in its plant operations including Aspen PIMS(TM), Aspen DMCplus(TM) and Aspen InfoPlus.21(TM).

About The Reliance Group

Reliance Industries Limited (RIL) is India's largest private sector company on all major financial parameters with the turnover of US$ 16.7 billion, cash profit of US$ 2.8 billion, net profit of US$ 1.7 billion and net worth of US$ 9.2 billion. RIL is the first and the only private sector company from India to feature in the 2004 Fortune Global 500 list of 'World's Largest Corporations' and ranks amongst the world's Top 200 companies in terms of profits.

About AspenTech

Aspen Technology, Inc. provides industry-leading software and professional services that help process companies improve efficiency and profitability by enabling them to model, manage and control their operations. The new generation of integrated aspenONE(TM) solutions are aligned with the key industry business processes, providing manufacturers the capabilities they need to optimize operational performance, make real-time decisions and synchronize the plant and supply chain. Over 1,500 leading companies already rely on AspenTech's software, including Bayer, BASF, BP, ChevronTexaco, DuPont, ExxonMobil, Fluor, GlaxoSmithKline, Sanofi-Aventis, Shell, and Total. For more information, visit www.aspentech.com.

This press release may contain forward-looking statements for purposes of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Actual results may vary significantly from AspenTech's expectations based on a number of risks and uncertainties, including, without limitation: AspenTech's plan to improve operational performance may not be implemented effectively; AspenTech has identified material weaknesses in its internal controls with respect to software license revenue recognition and other matters, that, if not remedied effectively, could result in material misstatements; risks around securities litigation and investigations; AspenTech's lengthy sales cycle makes it difficult to predict quarterly operating results; fluctuations in AspenTech's quarterly operating results; AspenTech's dependence on customers in the cyclical chemicals, petrochemicals and petroleum industries; the possibility of new accounting standards or the interpretation of existing accounting standards affecting our financial results; AspenTech's ability to raise additional capital as required; intense competition; AspenTech's need to develop and market products successfully; reliance on relationships with strategic partners; challenges associated with international operations; and other risk factors described from time to time in AspenTech's periodic reports filed with the Securities and Exchange Commission. AspenTech cannot guarantee any future results, levels of activity, performance, or achievements. AspenTech expressly disclaims any current intention to update forward-looking statements after the date of this press release.

AspenTech, Aspen Plus, Aspen HYSYS, Aspen PIMS, Aspen DMCplus, Aspen InfoPlus.21, aspenONE and the aspen leaf logo are trademarks of Aspen Technology, Inc., Cambridge, Mass.

CONTACT:
For Media:
Aspen Technology, Inc.
Marie Telepneff, 617-949-1324
marie.telepneff@aspentech.com