Aspen Technology to Host Investor Day

June 30, 2009

Aspen Technology to Host Investor Day
Burlington, Mass. - Aspen Technology, Inc. (OTC: AZPN.PK), a leading provider of software and services to the process industries, today announced that it will host an Investor Day on Thursday, July 9th, 2009 at the Company’s headquarters in Burlington, MA.

The management team will discuss the Company’s operational performance and selected, preliminary financial results for the fourth quarter of fiscal 2009, aspenONE and corporate strategies, addressable market opportunity, as well as a financial review.

The AspenTech presentation will begin at 8:00 a.m. Eastern Time with a review of the fourth quarter fiscal 2009 highlights, and the overall Investor Day is expected to last approximately four and a half hours. AspenTech executives presenting at the event will include Mark Fusco, President and Chief Executive Officer; Mark Sullivan, Chief Financial Officer; Antonio Pietri, Executive Vice President, Field Operations; and Blair Wheeler, Senior Vice President, Marketing.

The presentation will be webcast live and available on the Investor Relations section of the website. The webcast will be archived on the Company’s website after the presentation ends.

About AspenTech

AspenTech is a leading supplier of software that optimizes process manufacturing – including oil and gas, petroleum, chemicals, pharmaceuticals and other industries that manufacture and produce products from a chemical process. With integrated aspenONE solutions, process manufacturers can implement best practices for optimizing their engineering, manufacturing and supply chain operations. As a result, AspenTech customers are better able to increase capacity, improve margins, reduce costs and become more energy efficient. To see how the world’s leading process manufacturers rely on AspenTech to achieve their operational excellence goals, visit www.aspentech.com.

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