Release Details

CAMBRIDGE, Mass.--(BUSINESS WIRE)--May 9, 2006--Aspen Technology, Inc. (NASDAQ: AZPN), a leading provider of software and services to the process industries, announced today that its chief financial officer, Charles F. Kane, will leave the company to become the chief financial officer of RSA Security. The effective date of resignation has yet to be determined. The company also announced that it will conduct a search to replace Mr. Kane.

Mark Fusco, chief executive officer of AspenTech, stated "Chuck Kane has done an outstanding job at AspenTech and he will be missed. Since joining the company in July 2003, he has played an important role in improving the company's processes and controls and reducing our overall expense structure. His hard work has helped to position AspenTech for continued solid financial performance, as evidenced by recent financial results. We wish Chuck the best in his new career opportunity."

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. AspenTech's 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, Chevron Corporation, DuPont, ExxonMobil, Fluor, GlaxoSmithKline, Sanofi-Aventis, Shell, and Total. For more information, visit www.aspentech.com.

AspenTech and the aspen leaf logo are trademarks of Aspen Technology, Inc., Cambridge, Mass.

CONTACT:
Integrated Corporate Relations
Timothy Dolan, 617-217-2230
Timothy.Dolan@icrinc.com