SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 -------------------- FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 13, 2002 ASPEN TECHNOLOGY, INC. (Exact name of registrant as specified in its charter) DELAWARE 0-24786 04-2739697 - -------------------------------------------------------------------------------- (State or other jurisdiction of (Commission (I.R.S. Employer incorporation or organization) File Number) Identification No.) Ten Canal Park, Cambridge, Massachusetts 02141 ---------------------------------------------------- (Address of principal executive office and zip code) (617) 949-1000 ---------------------------------------------------- (Registrant's telephone number, including area code)

ITEM 5. OTHER EVENTS. On September 13, 2002, we issued a press release with respect to an article published in an internet newsletter. A copy of the press release is filed as Exhibit 99.1 hereto. ITEM 7. FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS. (a) FINANCIAL STATEMENTS OF BUSINESS ACQUIRED Not applicable. (b) PRO FORMA FINANCIAL INFORMATION Not applicable. (c) EXHIBITS Exhibit Number Description ------- ----------- 99.1 Press release of Aspen Technology, Inc. issued September 13, 2002. SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. ASPEN TECHNOLOGY, INC. Dated: September 16, 2002 By: /s/ LISA W. ZAPPALA ------------------------------------- Lisa W. Zappala Senior Vice President and Chief Financial Officer 2

EXHIBIT 99.1 ASPENTECH DISPELS RUMOR THE COMPANY IS FOR SALE Company refutes erroneous article in internet newsletter CAMBRIDGE, MA--SEPTEMBER 13, 2002 -- Aspen Technology, Inc. (Nasdaq: AZPN - News) today issued a statement discrediting an article that appeared in an internet newsletter covering process automation, which stated that AspenTech was for sale. Larry Evans, Chairman and CEO said, "It is our normal policy not to comment on market rumors about matters such as acquisitions and other material events. However, this article included blatantly false information that the company was for sale and that an investment bank, JP Morgan, had circulated a prospectus. This information is completely untrue and the concerns this article caused among our employees and other constituents warranted issuing this statement. "We are executing on a strategy intended to return us to operating profitability and positive cash flow as quickly as possible and I am confident that the recent changes we have implemented have put us on the right track." The Company noted that this statement is an exception to its policy of not commenting on market rumors, and that in the future it will maintain its policy of not commenting on rumors. ABOUT ASPENTECH Aspen Technology, Inc. is a leading supplier of enterprise software and services to the process industries, enabling its customers to increase their margins and optimize their business performance. AspenTech's engineering solutions, incorporating Hyprotech's technologies, help companies design and improve their plants and processes, maximizing returns throughout their operational life. AspenTech's supply chain manufacturing solutions allow companies to run their plants and supply chain more profitably, from customer demand through to the delivery of the finished product. Over 1,200 leading companies rely on AspenTech's software every day to drive improvements across their most important engineering and operational processes. AspenTech's customers include: Air Liquide, AstraZeneca, Bayer, BASF, BP, ChevronTexaco, Dow Chemical, DuPont, ExxonMobil, GlaxoSmithKline, Lyondell Equistar, Merck, Mitsubishi Chemical, Shell and Unilever. For more information, visit http://www.aspentech.com. Paragraphs, 2, 3, and 4 of this press release contain forward-looking statements for purposes of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These statements involve factors that may cause AspenTech's actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by such forward- looking statements. Specifically, by way of example and without limitation, some of the statements in the third, fourth, fifth and sixth paragraphs are forward-looking statements and their achievement is subject to a number of factors including: AspenTech's lengthy sales cycle which makes it difficult to predict quarterly operating results; fluctuations in AspenTech's quarterly operating results; AspenTech's dependence on customers in the cyclical chemicals, petrochemicals and petroleum industries; AspenTech's dependence on key employees; intense competition; AspenTech's dependence on systems integrators and other strategic partners; and other risk factors described from time to time in AspenTech's periodic reports filed with the Securities and Exchange Commission. AspenTech cannot guarantee any future results, levels of activity, performance, or

achievements. Moreover, neither AspenTech nor anyone else assumes responsibility for the accuracy and completeness of any forward-looking statements. AspenTech undertakes no obligation to update any of the forward-looking statements after the date of this press release.