Exhibit 99.1

Contacts:

Aspen Technology Announces Financial Results for the Fourth Quarter and Fiscal Year 2015

Bedford, Mass. — August 13, 2015 — Aspen Technology, Inc. (NASDAQ: AZPN), a leading provider of software and services to the process industries, today announced financial results for its fourth quarter and fiscal year ended June 30, 2015.

“AspenTech reported solid fourth quarter results that exceeded our expectations from both a revenue and profitability perspective,” said Antonio Pietri, President and Chief Executive Officer of AspenTech.  “Our ability to deliver double-digit annual spend growth against the backdrop of an increasingly challenging macro environment reflects the strength of AspenTech’s model and the mission critical nature of our solutions.”

Pietri added, “Our strong balance sheet and significant free cash flow, driven in part by our expense discipline, enabled us to repurchase approximately 7.7 million shares of common stock during fiscal 2015. As we enter fiscal 2016, we will continue to focus on driving increased usage across the aspenONE suite in order to deliver continued top and bottom line growth and shareholder value.”

Fourth Quarter and Fiscal Year 2015 Business Highlights

·                 The license portion of total contract value was $2.07 billion at the end of fiscal 2015, which increased 2.2% from March 31, 2015 and 11.8% compared to the end of fiscal 2014.

·                 Total contract value, including the value of bundled maintenance, was $2.46 billion at the end of fiscal 2015, which increased 2.2% from March 31, 2015 and 12.3% compared to the end of fiscal 2014.

·                 Annual spend, which the company defines as the annualized value of all term license and term maintenance contracts at the end of the quarter, was $419 million at the end of fiscal 2015, an increase of 1.9% from March 31, 2015 and 10.5% from the end of fiscal 2014.

·                 GAAP operating margin was 41.1%, compared to 36.8% in the fourth quarter of fiscal 2014.  Non-GAAP operating margin was 44.2%, compared to 39.9% in the fourth quarter of fiscal 2014.

·                 We repurchased nearly 1.8 million shares of our common stock for $73.6 million in the fourth quarter of fiscal 2015.

Summary of Fourth Quarter Fiscal Year 2015 Financial Results

AspenTech’s total revenue of $114.2 million increased 12.5% from $101.5 million in the fourth quarter of the prior year.

·                  Subscription and software revenue was $105.6 million in the fourth quarter of fiscal 2015, an increase from $91.6 million in the fourth quarter of fiscal 2014.

·                  Services and other revenue was $8.5 million in the fourth quarter of fiscal 2015, a decrease from $10.0 million in the fourth quarter of fiscal 2014.

For the quarter ended June 30, 2015, AspenTech reported income from operations of $46.9 million, compared to income from operations of $37.4 million for the quarter ended June 30, 2014.

Net income was $30.8 million for the quarter ended June 30, 2015, leading to net income per share of $0.36, compared to net income per share of $0.29 in the same period last fiscal year.

Non-GAAP income from operations, which adds back stock-based compensation expense, restructuring charges, amortization of intangibles associated with acquisitions and non-capitalized acquired technology, was $50.5 million for the fourth quarter of fiscal 2015, compared to a non-GAAP income from operations of $40.5 million in the same period last fiscal year.  Non-GAAP net income was $33.1 million, or $0.39 per share, for the fourth quarter of fiscal 2015, compared to non-GAAP net income of $28.7 million, or $0.31 per share, in the same period last fiscal year.

AspenTech had cash and marketable securities of $218.5 million at June 30, 2015, compared to $225.0 million at the end of the prior quarter after using $74.4 million in cash to repurchase shares of common stock.  During the fourth quarter, the company generated $53.6 million in cash flow from operations.  On a non-GAAP basis, cash flow from operations was $68.7 million and free cash flow was $67.0 million after taking into consideration $1.8 million in capital expenditures and capitalized software.  Both non-GAAP figures include $15.2 million of excess tax benefits from stock-based compensation.

Summary of Fiscal Year 2015 Financial Results

AspenTech’s total revenue of $440.4 million increased 12.5% from $391.5 million for fiscal year 2014.

·                  Subscription and software revenue was $405.6 million, an increase from $350.5 million for fiscal year 2014.

·                  Services and other revenue was $34.8 million, compared to $41.0 million for fiscal year 2014.

For the fiscal year ended June 30, 2015, AspenTech reported income from operations of $179.8 million, an improvement from income from operations of $129.7 million for fiscal year 2014.

Net income was $118.4 million for the fiscal year ended June 30, 2015, leading to net income per share of $1.33, compared to net income per share of $0.92 for fiscal year 2014.

Non-GAAP income from operations was $198.4 million for fiscal year 2015, an improvement compared to non-GAAP income from operations of $149.5 million for fiscal year 2014.  Non-GAAP net income was $130.3 million, or $1.46 per share, for fiscal year 2015, an improvement compared to non-GAAP net income of $98.5 million, or $1.05 per share, for fiscal year 2014.

For the fiscal year ended June 30, 2015, the company generated $192.0 million in cash flow from operations, $231.6 million in non-GAAP cash flow from operations and $223.6 million in free cash flow.  Both non-GAAP figures include the $2.6 million cash payment associated with the purchase of non-capitalized acquired technology and include $37.0 million of excess tax benefits from stock-based compensation.

Use of Non-GAAP Financial Measures

This press release contains “non-GAAP financial measures” under the rules of the U.S. Securities and Exchange Commission. Non-GAAP financial measures are not based on a comprehensive set of accounting rules or principles. This non-GAAP information supplements, and is not intended to represent a measure of performance in accordance with, disclosures required by generally accepted accounting principles, or GAAP.  Non-GAAP financial measures should be considered in addition to, not as a substitute for or superior to, financial measures determined in accordance with GAAP.  A reconciliation of GAAP to non-GAAP results is included in the financial tables included in this press release.

Management considers both GAAP and non-GAAP financial results in managing AspenTech’s business.  As the result of adoption of new licensing models, management believes that a number of AspenTech’s performance indicators based on GAAP, including revenue, gross profit, operating income and net income, should be viewed in conjunction with certain non-GAAP and other business measures in assessing AspenTech’s performance, growth and financial condition. Accordingly, management utilizes a number of non-GAAP and other business metrics, including the non-GAAP metrics set forth in this press release, to track AspenTech’s business performance. None of these non-GAAP metrics should be considered as an alternative to any measure of financial performance calculated in accordance with GAAP.

Conference Call and Webcast

AspenTech will host a conference call and webcast today, August 13, 2015, at 4:30 p.m. (Eastern Time), to discuss the company’s financial results for the fourth quarter and fiscal year 2015 as well as the company’s business outlook.

The live dial-in number is (877) 245-0126 or (706) 634-5625, conference ID code 90931889. Interested parties may also listen to a live webcast of the call by logging on to the Investor Relations section of AspenTech’s website, http://www.aspentech.com/corporate/investor.cfm, and clicking on the “webcast” link.  A replay of the call will be archived on AspenTech’s website and will also be available via telephone at (855) 859-2056 or (404) 537-3406, conference ID code 90931889, through September 13, 2015.

About AspenTech

AspenTech is a leading supplier of software that optimizes process manufacturing - for energy, chemicals, engineering and construction, and other industries that manufacture and produce products from a chemical process. With integrated aspenONE solutions, process manufacturers can implement best practices for optimizing their engineering, manufacturing and supply chain operations. As a result, AspenTech customers are better able to increase capacity, improve margins, reduce costs and become more energy efficient. To see how the world’s leading process manufacturers rely on AspenTech to achieve their operational excellence goals, visit www.aspentech.com.

Forward-Looking Statements

The third paragraph of this press release contains forward-looking statements for purposes of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995.  Actual results may vary significantly from AspenTech’s expectations based on a number of risks and uncertainties, including, without limitation:  AspenTech’s failure to increase usage and product adoption of aspenONE offerings, and failure to continue to provide innovative, market-leading solutions; demand for, or usage of, aspenONE software declines for any reason; unfavorable economic and market conditions or a lessening demand in the market for process optimization software; 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.  AspenTech expressly disclaims any obligation to update forward-looking statements after the date of this press release.

© 2015 Aspen Technology, Inc.  AspenTech, aspenONE and the Aspen leaf logo are registered trademarks of Aspen Technology, Inc. All rights reserved. All other trademarks are property of their respective owners.

Source: Aspen Technology, Inc.

ASPEN TECHNOLOGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS*

(In thousands, except per share data)

(*)- Certain items in prior period Consolidated Statements of Operations have been reclassified to conform to the current period presentation.

ASPEN TECHNOLOGY, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(Audited in thousands, except share data)

ASPEN TECHNOLOGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS*

(In thousands)

(*)- Certain items for the three and twelve months ended June 30, 2014 presented in the Consolidated Statements of Cash Flows have been reclassified to conform to the current period presentation.

ASPEN TECHNOLOGY, INC. AND SUBSIDIARIES

Reconciliation of GAAP to Non-GAAP Results of Operations and Cash Flows

The following tables reflect a reconciliation of selected Aspen Technology GAAP to Non-GAAP results of operations and cash flows.
(unaudited in thousands, except per share data)

ASPEN TECHNOLOGY, INC. AND SUBSIDIARIES

Reconciliation of GAAP to Non-GAAP Results of Operations and Cash Flows

The following tables reflect a reconciliation of selected Aspen Technology GAAP to Non-GAAP results of operations and cash flows.
(unaudited in thousands, except per share data)

(a) GAAP total expenses

(b) Stock-based compensation expense was as follows:

(c) The income tax effect on non-GAAP items for the three and twelve months ended June 30, 2015 and 2014 is calculated utilizing the Company’s estimated federal and state tax rate of 36%.

(d) Excess tax benefits from stock-based compensation are included in non-GAAP cash flows from operating activities and free cash flow to be consistent with the treatment of other tax benefits. Refer to the Company’s Form 10-K for the period ended June 30, 2015 for additional details.

(e) During the three months ended March 31, 2015 and 2014, we acquired certain technology for $3.3 million and $4.9 million, respectively, as a part of projects initiated during these periods to develop commercially available products. At the time of these purchases, the projects did not meet the accounting definition of having reached technological feasibility, and, as such, the costs of the acquired technology were expensed during the three and nine months ended March 31, 2015 and 2014.  During the three and nine months ended March 31, 2015 and 2014, we excluded the payments of $2.6 million and $3.9 million for the acquired technology from non-GAAP cash flows from operating activities and free cash flow to be consistent with the treatment of other transactions where acquired assets are capitalized.