Aspen Technology Announces Date and Time of its First Quarter Earnings Release

October 3, 2003
Earnings release to be issued on October 29, 2003, after market close

CAMBRIDGE, Mass.--(BUSINESS WIRE)--Oct. 3, 2003-- Aspen Technology, Inc. (Nasdaq:AZPN) today announced the date and time of its first quarter fiscal year 2004 earnings release and webcast for the period ending, September 30, 2003. The company's management team will hold a webcast to discuss its financial results, business outlook, and related corporate and financial matters, beginning at 5:00 p.m. on Wednesday, October 29, 2003. 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.

The company will also be holding User Group Meetings with customers from October 5-8 in New Orleans, Louisiana and from October 19-22 in Paris, France, to showcase new products and solutions for each of its major vertical markets.

What: Aspen Technology's First Quarter Earnings Release

When: Wednesday, October 29, 2003, after market close

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 increase efficiency and profitability. AspenTech's engineering product line is used to design and improve plants and processes, maximizing returns throughout an asset's operating life. Its manufacturing/supply chain product line allows companies to increase margins in their plants and supply chains, by managing customer demand, optimizing production, and streamlining the delivery of finished products. These two offerings are combined to create solutions for Enterprise Operations Management (EOM), integrated enterprise-wide systems that provide process manufacturers with the capability to dramatically improve their operating performance. Over 1,500 leading companies already rely on AspenTech's software, including Aventis, Bayer, BASF, BP, ChevronTexaco, Dow Chemical, DuPont, ExxonMobil, Fluor, Foster Wheeler, GlaxoSmithKline, Shell, and TotalFinaElf. For more information, visit www.aspentech.com .

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