Aspen Technology to Present at the 16th Annual Wachovia Securities Nantucket Equity Conference

June 16, 2006

CAMBRIDGE, Mass.--(BUSINESS WIRE)--June 16, 2006--Aspen Technology, Inc. (Nasdaq: AZPN), a leading provider of software and services to the process industries, today announced its President and Chief Executive Officer, Mark Fusco, will present at the 16th Annual Wachovia Securities Nantucket Conference at the Harbor House in Nantucket, Massachusetts.

AspenTech's presentation will begin at 1:20 p.m. EST on Monday, June 19, 2006, and an audio webcast will be available in the Investor Relations section of the company's website (www.aspentech.com).

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

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


    CONTACT: Aspen Technology, Inc.
             Elisa Logan, 617-949-1398
             elisa.logan@aspentech.com
             or
             Integrated Corporate Relations
             Kori Doherty, 617-217-2084
             kdoherty@icrinc.com

    SOURCE: Aspen Technology, Inc.