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

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

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

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

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

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 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

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

Aspen Technology Announces Selected Financial Results for Fourth-Quarter Fiscal Year 2006, Stock Option Grant Review and Restatement

Aspen Technology Announces Selected Financial Results for Fourth-Quarter Fiscal Year 2006, Stock Option Grant Review and Restatement

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

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

Aspen Technology Announces Selected Preliminary Financial Results for the Fourth Quarter and Fiscal Year 2009

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

Page 276 of 285