Aspen Technology Comments on Civil Complaint Filed by the Securities and Exchange Commission Against Three Former Officers and the Criminal Complaint Filed by the U.S. Attorney Against One of them, David L. McQuillin

Aspen Technology Appoints David Leitham as Senior Vice President and General Manager

Aspen Technology Appoints Chantelle Breithaupt as Senior Vice President and Chief Financial Officer

Aspen Technology Announces the Acquisition of Camo Analytics AS

Aspen Technology Announces Selected Preliminary Financial Results for the Third Quarter of Fiscal Year 2009

Announces new subscription-based commercial model for aspenONE suite of solutions

Aspen Technology Announces Selected Preliminary Financial Results for the Fourth Quarter and Fiscal Year 2008

Aspen Technology Announces Selected Preliminary Financial Results for Second Quarter Fiscal 2008

Aspen Technology Announces Selected Preliminary Financial Results for Second Quarter Fiscal 2008

Aspen Technology Announces Selected Financial Results for Second-Quarter Fiscal Year 2007