Release Details

CAMBRIDGE, Mass.--(BUSINESS WIRE)--April 25, 2005--Aspen Technology, Inc. (Nasdaq:AZPN) today announced that the company will disclose financial results for its fiscal 2005 third quarter, ended March 31, 2005, on Thursday, May 5, 2005, after the close of the Nasdaq stock market. The company will hold a conference call and webcast with investors that evening to discuss its financial results, business outlook, and related corporate and financial matters beginning at 4:45 p.m. Eastern Time. The webcast will be open to interested parties by accessing the Investor Relations section of the company's website at http://www.aspentech.com and clicking on the webcast hyperlink.

What: AspenTech Fiscal 2005 Third Quarter Conference Call and Webcast

When: Thursday, May 5, 2005, 4:45 p.m. ET

Where: http://www.aspentech.com

How: Live over the Internet - Access the call through the AspenTech homepage

Contact: Joshua Young, Director of Investor Relations, Aspen Technology, Inc.

If you are unable to listen to the live webcast, the call will be archived on the Investor Relations section of AspenTech's website at the conclusion of the call.

About AspenTech

Aspen Technology, Inc. provides industry-leading software and implementation services that enable process companies to use simulation models to increase efficiency and profitability. aspenONE, a new generation of software solutions from AspenTech, represents a major step forward in helping process manufacturers achieve their strategic operational excellence initiatives. aspenONE provides companies with integrated systems that enable them to manage and optimize their operational performance. Over 1,500 leading companies already rely on AspenTech's software, including Aventis, Bayer, BASF, BP, ChevronTexaco, Dow Chemical, DuPont, ExxonMobil, Fluor, GlaxoSmithKline, Shell, and Total. For more information, visit www.aspentech.com.

CONTACT:
Aspen Technology, Inc.
Joshua Young, 617-949-1274
joshua.young@aspentech.com