Aspen Technology Announces Secondary Offering of 18,000,000 Shares of Common Stock by Affiliates of Advent International

April 9, 2007

CAMBRIDGE, Mass.--(BUSINESS WIRE)--April 9, 2007--Aspen Technology, Inc. (Nasdaq: AZPN), a provider of software and services to the process industries, today announced that it has filed a registration statement with the U.S. Securities and Exchange Commission for a secondary offering of 18,000,000 shares of common stock. The shares will be offered by 15 private equity funds managed by Advent International Corporation. The selling stockholders will grant the underwriters an option to acquire an additional 2,700,000 shares to cover over allotments, if any. Aspen Technology will not sell any shares in the offering and will not receive any of the proceeds from sales of the shares. The filing is pursuant to Advent International's registration rights under the 2003 Investor Rights Agreement with Aspen Technology.

J.P. Morgan Securities Inc. and Deutsche Bank Securities Inc. are acting as joint bookrunning managers for the offering. When available, a copy of the prospectus relating to the offering may be obtained from J.P. Morgan Securities Inc. at: Prospectus Department, 4 Chase Metrotech Center, CS Level, Brooklyn, NY 11245; Telephone: (718) 242-8002, or from Deutsche Bank Securities Inc. at: 60 Wall Street, 4th Floor, New York, NY 10005; Telephone: (800) 503-4611.

A registration statement relating to these securities has been filed with the Securities and Exchange Commission but has not yet become effective. These securities may not be sold nor may offers to buy be accepted prior to the time that the registration statement is declared effective.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

(C) 2007 Aspen Technology, Inc. AspenTech (R), aspenONE (R) and the Aspen leaf logo are registered trademarks of Aspen Technology, Inc. All rights reserved.

CONTACT:
Media:
Aspen Technology, Inc.
Jeannine McDonough, 617-949-1276
Jeannine.McDonough@aspentech.com
or
Investors:
Integrated Corporate Relations
Kori Doherty, 617-956-6730
kdoherty@icrinc.com

SOURCE:
Aspen Technology, Inc.