Aspen Technology Announces Pricing of Secondary Public Offering

September 23, 2010

Aspen Technology Announces Pricing of Secondary Public Offering
Burlington, Mass - Aspen Technology, Inc. (NASDAQ: AZPN), a leading provider of software and services to the process industries, today announced the pricing of its secondary public offering of 18,000,000 shares of common stock at a price of $9.00 per share, an increase from 15,000,000 shares as originally offered. All of the shares are being offered by funds managed by Advent International Corporation, a global private equity firm. In addition, the selling stockholders have granted the underwriters a 30-day option to purchase up to 2,700,000 shares to cover any overallotments. Aspen Technology will not receive any of the proceeds from the sale of shares.

J.P. Morgan Securities LLC and Deutsche Bank Securities Inc. are acting as joint book-running managers for the offering. William Blair & Company, L.L.C., Canaccord Genuity Inc., Wells Fargo Securities, LLC, Cowen and Company, LLC and Pacific Crest Securities LLC are the co-managers of the offering.

The offering is being made only by means of a prospectus. A copy of the prospectus relating to this offering may be obtained from J.P. Morgan Securities LLC, via telephone at: (866) 430-0686, or by mail at c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717; or from Deutsche Bank Securities Inc., via telephone at: (800) 503-4611, by email at or by mail at Deutsche Bank Securities Inc., Attn: Prospectus Department, 100 Plaza One, Jersey City, NJ 07311.

A registration statement relating to these securities has been declared effective by the Securities and Exchange Commission. This press release shall not constitute an offer to sell or a solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About AspenTech
AspenTech is a leading global provider of mission-critical process optimization software solutions, which are designed to manage and optimize plant and process design, operational performance, and supply chain planning. The company’s aspenONE software and related services have been developed specifically for companies in the process industries, including the energy, chemicals, pharmaceuticals, and engineering and construction industries. AspenTech customers use its solutions to improve their competitiveness and profitability by increasing throughput and productivity, reducing operating costs, enhancing capital efficiency, and decreasing working capital requirements.