Files Annual Report on Form 10-K for Fiscal Year 2009; Files Quarterly Reports on Form 10-Q for First, Second and Third Quarters Fiscal 2009; Announces Selected Preliminary Financial Results for First Quarter Fiscal 2010

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

AspenTech Simplifies Enterprise Rollout and Management of AspenONE Using Latest Microsoft Technologies

AspenTech’s Patented aspenONE Master Data Model Delivers Asset Lifecycle Management

Leading Energy, Chemicals, and Other Process Industry Manufacturers Gather in Seattle for AspenTech Supply Chain Management User Conference

AspenTech Software Used by Process Manufacturing Industry to Combat Global Warming

Aspen Technology Announces Date of Conference Call to Review Selected Preliminary Financial Results

AspenTech’s Aspen Licensing Center Provides Customers Insight to Replicate Best Practices Across the Enterprise

AspenTech’s 2008 User Conferences Highlight Best Practices in Operational Excellence