Aspen Technology Announces Date of Fiscal 2007 Second-Quarter Financial Results Release, Conference Call and Webcast.

CAMBRIDGE, Mass. -- Aspen Technology, Inc. (Nasdaq: AZPN), a leading provider of software and services to the process industries, today announced that the company will release financial results for its fiscal 2007 second quarter, ended December 31, 2006, after the U.S. financial markets close on Tuesday, February 6, 2007.

In conjunction with this announcement, AspenTech will host a conference call and webcast on February 6, 2007, at 4:45 pm (Eastern Time) to discuss the Company's financial results, business outlook, and related corporate and financial matters. The live dial-in number is 1-877-239-3024, conference ID code 5947370. 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 1-800-642-1687 or 1-706-645-9291, conference ID code 5947370, through February 13, 2007.

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 solutions is 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. For more information, visit www.aspentech.com.

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