Officers, Board of Directors and Corporate Information Executive Officers Corporate Offices Corporate Information David L. McQuillin President & Chief Executive Officer Wayne Sim Senior Vice President Worldw ide Sales Charles Kane Senior Vice President Chief Financial Officer Stephen Doyle General Counsel Chief Strategy Officer Helen Moye Senior Vice President Human Resources Manolis Kotzabasakis Senior Vice President Engineering Steve Pringle Senior Vice President Manufacturing/Supply Chain Lawrence B. Evans Chairman David L. McQuillin President & Chief Executive Officer Gresham T. Brebach, Jr. Managing Director The Brebach Group, LLC. Douglas R. Brown President & Chief Executive Officer Ionics, Inc. Stephen L. Brown Retired Chairman & Chief Executive Officer John Hancock Financial Services Stephen M. Jennings Director Monitor Group Douglas A. Kingsley Managing Director Advent International Joan C. McArdle Senior Vice President Massachusetts Capital Resource Co. Michael Pehl Operating Partner Advent International Deloitte & Touche 200 Berkeley Street Boston, MA 02116 AspenTech Inc. Keypoint Singapore T + 65 6395 3900 Independent Public Accountants AspenTech Japan Co., Ltd. Tokyo Japan T + 81 33 262 1710 Aspen Technology España, S.A. Barcelona Spain T + 34 93 215 6884 AspenTech Ltd. Cambridge United Kingdom T + 44 1223 819 700 AspenTech Europe S.A./N.V. Brussels Belgium T + 32 2 701 9450 Aspen Technology, Inc. Calgary Canada T 403 303 1000 Aspen Technology, Inc. San Diego CA T 858 703 4800 Aspen Technology, Inc. Rockville MD T 301 795 6800 Aspen Technology, Inc. Bothell WA T 425 492 2000 Aspen Technology, Inc. New Providence NJ T 908 516 9500 Aspen Technology, Inc. Houston TX T 281 584 1000 Questions regarding taxpayer identification numbers, transfer procedures and other stock  account matters should be  addressed to the Transfer Agent & Registrar at: American Stock Transfer & Trust Co. 6201 15th Avenue Brooklyn, NY 11219 T 800 937 5449 http://www.amstock.com info@amstock.com The Annual Meeting of Shareholders will be held on December 09, 2003 at the offices of: Hale and Dorr LLP 26th Floor 60 State Street Boston, MA 02109 Shareholders may obtain a copy of the Company’s annual report on Form 10K, filed with the Securities & Exchange Commission, by sending a written request to: Investor Relations Aspen Technology, Inc. Ten Canal Park Cambridge, MA 02141-2201 T 617 949 1274 Projections, estimates and business plans in this publication are forward- looking statements that involve risks and uncertainties. Actual future market growth, capital expenditures, costs, earnings, events, financial performance and plans could differ materially due to, for example, changes in market conditions, the outcome of commercial negotiations, changes in operating conditions and costs, technology developments and other factors discussed in this document and in Item 1A of the Company’s Form 10K for the year ended June 30, 2003. AspenTech, Aspen Enterprise Platform, Plantelligence and Aspen Engineering Suite are trademarks or registered trademarks of Aspen Technology, Inc., Cambridge, MA, USA. Copyright © 2003 Aspen Technology, Inc. All rights reserved. Board of Directors Headquarters Aspen Technology, Inc. Cambridge MA T 617 949 1000 Legal Counsel Hale and Dorr LLP 60 State Street Boston, MA 02109