Aspen Technology Sets Date for Second Quarter Earnings Release And Conference Call

January 6, 2003

Earnings Release to be Issued on January 30, 2003, After the Market Close

CAMBRIDGE, Mass., Jan. 6 /PRNewswire-FirstCall/ -- Aspen Technology, Inc. (Nasdaq: AZPN) today announced the date and time of its second quarter earnings release and conference call for the period ending, December 31, 2002. The company's management team will hold a Webcast to discuss its financial results and business outlook beginning at 4:45 p.m. on Thursday, January 30, 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 link.

What: Aspen Technology's Second Quarter Earnings Release &
Conference Call

When: Thursday, January 30, 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 participate during the live Webcast, the call will be archived on http://www.aspentech.com for ten days. To access the replay, click on Investor Relations and then access the conference call link.

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, including 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 through to the delivery of the 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, Aventis, Bayer, BASF, BP, ChevronTexaco, Dow Chemical, DuPont, ExxonMobil, GlaxoSmithKline, Lyondell Equistar, Merck, Mitsubishi Chemical, Shell, Southern Company, TXU Energy and Unilever. For more information, visit http://www.aspentech.com.

CONTACT:

Joshua Young

Aspen Technology, Inc.

(617) 949-1274

joshua.young@aspentech.com SOURCE Aspen Technology, Inc.

-0- 01/06/2003

/CONTACT: Joshua Young of Aspen Technology, +1-617-949-1274, or joshua.young@aspentech.com/