## Officers, Board of Directors and Corporate Information 

## Executive Officers 

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 

## Board of Directors 

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 

## Corporate Offices 

Headquarters Aspen Technology, Inc. Cambridge MA T 617 949 1000 

Aspen Technology, Inc. Houston TX T 281 584 1000 

Aspen Technology, Inc. New Providence NJ T 908 516 9500 

Aspen Technology, Inc. Bothell WA T 425 492 2000 

Aspen Technology, Inc. Rockville MD T 301 795 6800 

Aspen Technology, Inc. San Diego CA T 858 703 4800 

Aspen Technology, Inc. Calgary Canada T 403 303 1000 

AspenTech Europe S.A./N.V. Brussels Belgium T + 32 2 701 9450 

AspenTech Ltd. Cambridge United Kingdom T + 44 1223 819 700 

Aspen Technology España, S.A. Barcelona Spain T + 34 93 215 6884 

AspenTech Japan Co., Ltd. Tokyo Japan T + 81 33 262 1710 

AspenTech Inc. Keypoint Singapore T + 65 6395 3900 Independent Public Accountants 

Deloitte & Touche 200 Berkeley Street Boston, MA 02116 

Legal Counsel Hale and Dorr LLP 60 State Street Boston, MA 02109 

## Corporate Information 

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. 

