Aspen Technology Announces Date of First-Quarter Fiscal 2010 Financial Results Release, Conference Call and Webcast

Burlington, Mass - Aspen Technology, Inc. (OTC: AZPN.PK), a leading provider of software and services to the process industries, today announced that it will release financial results for its first-quarter fiscal 2010, ended September 30, 2009, on Monday, December 21, 2009. The company also expects to file its Quarterly Report on Form 10-Q for the first-quarter of fiscal 2010 with the Securities and Exchange Commission (SEC) that morning before the market opens. In conjunction with this announcement, AspenTech will host a conference call and webcast on December 21, 2009, at 8:00 a.m. (Eastern Time) to discuss the company's financial results, business outlook, and related corporate and financial matters.

The live dial-in number is (877) 245-0126, conference ID code 47703559. Interested parties may also listen to a live webcast of the call by logging on to the Investor Relations section of AspenTech’s website, http://www.aspentech.com/corporate/investor.cfm, and clicking on the “webcast” link. A replay of the call will be archived on AspenTech’s website and will also be available via telephone at (800) 642-1687 or (706) 645-9291, conference ID code 47703559 through December 28, 2009.

About AspenTech
AspenTech is a leading supplier of software that optimizes process manufacturing – for energy, chemicals, pharmaceuticals, engineering and construction, 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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