Aspen Technology Files Form 12b-25 with the Securities and Exchange Commission

September 13, 2006

CAMBRIDGE, Mass.--(BUSINESS WIRE)--Sept. 13, 2006--Aspen Technology, Inc. (Nasdaq: AZPN), a leading provider of software and services to the process industries, today filed a Form 12b-25 with the Securities and Exchange Commission (SEC) in order to obtain a 15-day extension for the filing of its Annual Report on Form 10-K for the fiscal year ended June 30, 2006.

On September 6, 2006, the company disclosed that, based on a review by an independent subcommittee of the board of directors of the accounting treatment for certain historical stock options granted during and prior to fiscal 2004, it will be necessary to restate certain previously issued financial statements. The Form 12b-25 was filed in order to provide the subcommittee with additional time to complete its review and to afford the company time to complete the required restatements.

The full text of the Form 12b-25, as well as the Current Report on Form 8-K filed by the company on September 6, 2006 with respect to the required restatement of previously issued financial statements, may be found on the Investor Relations section of the company's Web site at, or the SEC's EDGAR site at

About AspenTech

Aspen Technology, Inc. provides industry-leading software and professional services that help process companies improve efficiency and profitability by enabling them to model, manage and control their operations. The new generation of integrated aspenONE solutions are aligned with the key industry business processes, providing manufacturers the capabilities they need to optimize operational performance, make real-time decisions and synchronize the plant and supply chain. Over 1,500 leading companies already rely on AspenTech's software, including Bayer, BASF, BP, Chevron Corporation, DuPont, ExxonMobil, Fluor, GlaxoSmithKline, Sanofi-Aventis, Shell and Total. For more information, visit

AspenTech, aspenONE and the aspen leaf logo are trademarks of Aspen Technology, Inc., Cambridge, Mass.

Aspen Technology, Inc.
Patrick Pecorelli, 617-949-1220
Integrated Corporate Relations
Kori Doherty, 617-217-2084

SOURCE: Aspen Technology, Inc.