Aspen Technology Set Date for First Quarter 2003 Earnings Announcement

October 21, 2002
CAMBRIDGE, Mass., Oct 21, 2002 (BUSINESS WIRE) -- Aspen Technology, Inc. (Nasdaq: AZPN) today announced it will issue its first quarter fiscal 2003 earnings release on Thursday, October 24, 2002 after the market close. The company will host a conference call and webcast to discuss its financial results, business outlook, and related corporate and financial matters 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. A replay of the call will be archived on AspenTech's website for ten days and will also be available for two days via telephone, beginning at 8:00 p.m. EST on October 24, 2002, by dialing 719-457-0820 and entering in confirmation code 643085.

What: Aspen Technology Earnings Conference Call and Webcast
When: Thursday, October 24, 2002, 4:45 p.m. Eastern Time
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.

About AspenTech

Aspen Technology, Inc. is a leading supplier of enterprise software to the process industries, enabling its customers to increase their margins and optimize their business performance. AspenTech's engineering solutions, incorporating Hyprotech's technologies, help companies design and improve their plants and processes, maximizing returns throughout their operational life. AspenTech's manufacturing/supply chain solutions allow companies to run their plants and supply chains more profitably, from customer demand, to production in the plant, to the delivery of finished products. Over 1,200 leading companies rely on AspenTech's software every day to drive improvements across their most important engineering and operational processes. AspenTech's customers include: Air Liquide, AstraZeneca, Bayer, BASF, BP, ChevronTexaco, Dow Chemical, DuPont, ExxonMobil, GlaxoSmithKline, Lyondell Equistar, Merck, Mitsubishi Chemical, Shell and Unilever. For more information, visit www.aspentech.com.

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

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