Exhibit 99.1

PRESS RELEASE

INVESTOR CONTACT:

Lisa L. Ewbank

Synopsys, Inc.

650-584-1901

EDITORIAL CONTACT:

Yvette Huygen

Synopsys, Inc.

650-584-4547

yvetteh@synopsys.com

Synopsys Posts Financial Results for Fourth Quarter and Fiscal Year 2014

Q4 2014 Financial Highlights

FY 2014 Financial Highlights

MOUNTAIN VIEW, Calif. – Dec. 3, 2014 – Synopsys, Inc. (Nasdaq: SNPS), a global leader providing software, IP and services used to accelerate innovation in chips and electronic systems, today reported results for its fourth quarter and fiscal year 2014.

For the fourth quarter of fiscal 2014, Synopsys reported revenue of $539.0 million, compared to $504.9 million for the fourth quarter of fiscal 2013. Revenue for fiscal year 2014 was $2.057 billion, an increase of 4.9 percent from $1.962 billion in fiscal 2013.

“Fiscal 2014 was a very good, very significant year for Synopsys,” said Aart de Geus, chairman and co-CEO of Synopsys. “We delivered solid financial results, and built a strong foundation for 2015. We released game-changing new products that will drive a multi-year upgrade cycle. And we

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broadened our total addressable market to include the higher-growth software quality, test and security space. We look forward to another year of solid financial execution and operational performance.”

GAAP Results

On a generally accepted accounting principles (GAAP) basis, net income for the fourth quarter of fiscal 2014 was $62.5 million, or $0.39 per share, compared to $56.9 million, or $0.36 per share, for the fourth quarter of fiscal 2013. GAAP net income for fiscal year 2014 was $259.1 million, or $1.64 per share, compared to $247.8 million, or $1.58 per share, for fiscal 2013.

Non-GAAP Results

On a non-GAAP basis, net income for the fourth quarter of fiscal 2014 was $100.9 million, or $0.64 per share, compared to non-GAAP net income of $88.3 million, or $0.56 per share, for the fourth quarter of fiscal 2013. Non-GAAP net income for fiscal 2014 was $398.9 million, or $2.53 per share, compared to non-GAAP net income of $381.4 million, or $2.44 per share, for fiscal 2013. Reconciliation between GAAP and non-GAAP results is provided at the end of this press release.

Financial Targets

Synopsys also provided its financial targets for the first quarter and full fiscal year 2015. These targets do not include any future acquisition costs that may be incurred in fiscal year 2015. These targets constitute forward-looking information and are based on current expectations. For a discussion of factors that could cause actual results to differ materially from these targets, see “Forward-Looking Statements” below.

First Quarter of Fiscal Year 2015 Targets:

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Full Fiscal Year 2015 Targets:

GAAP Reconciliation

Synopsys continues to provide all information required in accordance with GAAP, but believes evaluating its ongoing operating results may not be as useful if an investor is limited to reviewing only GAAP financial measures. Accordingly, Synopsys presents non-GAAP financial measures in reporting its financial results to provide investors with an additional tool to evaluate Synopsys’ operating results in a manner that focuses on what Synopsys believes to be its ongoing business operations and what Synopsys uses to evaluate its ongoing operations and for internal planning and forecasting purposes. Synopsys’ management does not itself, nor does it suggest that investors should, consider such non-GAAP financial measures in isolation from, or as a substitute for, financial information prepared in accordance with GAAP. Synopsys’ management believes it is useful for itself and investors to review, as applicable, both GAAP information that includes: (i) the amortization of acquired intangible assets, (ii) the impact of stock compensation, (iii) acquisition-related costs, including inventory fair value adjustments, (iv) other significant items, including facilities restructuring charges and certain accruals for legal and tax matters, and (v) the income tax effect of non-GAAP pre-tax adjustments as well as unusual or infrequent tax adjustments; and the non-GAAP measures that exclude such information in order to assess the performance of Synopsys’ business and for planning and forecasting in subsequent periods. Whenever Synopsys uses a non-GAAP financial measure, it provides a reconciliation of the non-GAAP financial measure to the most closely applicable GAAP financial measure. Investors are encouraged to review the related GAAP financial measures and the reconciliation of these non-GAAP financial measures to their most directly comparable GAAP financial measure as detailed below.

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Reconciliation of Fourth Quarter and Fiscal Year 2014 Results

The following tables reconcile the specific items excluded from GAAP in the calculation of non-GAAP net income and earnings per share for the periods indicated below.

GAAP to Non-GAAP Reconciliation of Fourth Quarter and Fiscal Year 2014 Results

(unaudited and in thousands, except per share amounts)

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Reconciliation of Target Non-GAAP Operating Results

The following tables reconcile the specific items excluded from GAAP in the calculation of target non-GAAP operating results for the periods indicated below.

GAAP to Non-GAAP Reconciliation of First Quarter Fiscal Year 2015 Targets

(in thousands, except per share amounts)

GAAP to Non-GAAP Reconciliation of Full Fiscal Year 2015 Targets

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Earnings Call Open to Investors

Synopsys will hold a conference call for financial analysts and investors today at 2:00 p.m. Pacific Time. A live webcast of the call will be available at Synopsys’ corporate website at www.synopsys.com. A recording of the call will be available by calling +1-800-475-6701 (+1-320-365-3844 for international callers), access code 343554 beginning at 4:00 p.m. Pacific Time today. A webcast replay will also be available on the website from approximately 5:30 p.m. Pacific Time today through the time Synopsys announces its results for the first quarter fiscal 2015 in February 2015. Synopsys will post copies of the prepared remarks of Aart de Geus, chairman and co-chief executive officer, and Brian Beattie, chief financial officer, on its website following the call. In addition, Synopsys makes additional information available in a financial supplement and corporate overview presentation, also posted on the corporate website.

Effectiveness of Information

The targets included in this release, the statements made during the earnings conference call and the information contained in the financial supplement and corporate overview presentation (available in the Investor Relations section of Synopsys’ website at www.synopsys.com) represent Synopsys’ expectations and beliefs as of the date of this release only. Although this press release, copies of the prepared remarks of the co-chief executive officer and chief financial officer made during the call, the financial supplement and corporate overview presentation will remain available on Synopsys’ website through the date of the first quarter fiscal year 2015 earnings call in February 2015, their continued availability through such date does not mean that Synopsys is reaffirming or confirming their continued validity. Synopsys does not currently intend to report on its progress during the first quarter of fiscal 2015 or comment to analysts or investors on, or otherwise update, the targets given in this earnings release.

Availability of Final Financial Statements

Synopsys will include final financial statements for the fourth quarter and fiscal 2014 in its annual report on Form 10-K to be filed by December 31, 2014.

About Synopsys

Synopsys, Inc. (Nasdaq:SNPS) accelerates innovation in the global electronics market. As a leader in electronic design automation (EDA) and semiconductor IP, its software, IP and services help engineers address their design, verification, system and manufacturing challenges. Since 1986, engineers around the world have been using Synopsys technology to design and create billions of chips and systems. Learn more at http://www.synopsys.com.

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Forward-Looking Statements

This press release and our upcoming earnings results conference call contain forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934. Any statements that are not statements of historical fact may be deemed to be forward-looking statements. Forward-looking statements include but are not limited to: sections of this press release entitled “Financial Targets” and “Reconciliation of Target Non-GAAP Operating Results”; and statements regarding Synopsys’ business, acquisitions, new products, technologies, business model, new markets, customer demand for our technology, and projected financial results and business objectives. These statements involve known and unknown risks, uncertainties and other factors that could cause our actual results, time frames or achievements to differ materially from those expressed or implied in our forward-looking statements. Accordingly, we caution stockholders and prospective investors not to place undue reliance on these statements. Such risks, uncertainties and factors include, but are not limited to:

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In addition, Synopsys’ actual expenses, earnings per share and tax rate on a GAAP and non-GAAP basis for the fiscal quarter ending Jan. 31, 2015; actual expenses, earnings per share, tax rate, and other projections on a GAAP and non-GAAP basis for fiscal year 2015; and cash flow from operations on a GAAP basis for fiscal year 2015 could differ materially from the targets stated under “Financial Targets” above for a number of reasons, including, but not limited to, (i) integration and other acquisition-related costs, (ii) application of the actual consolidated GAAP and non-GAAP tax rates for such periods, or judgment by management, based upon the status of pending audits and settlements, to increase or decrease an income tax asset or liability, (iii) a determination by Synopsys that any portion of its goodwill or intangible assets has become impaired, (iv) changes in the anticipated amount of employee stock-based compensation expense recognized in Synopsys’ financial statements, (v) actual change in the fair value of Synopsys’ non-qualified deferred compensation plan obligations, (vi) increases or decreases to estimated capital expenditures, (vii) changes driven by new accounting rules, regulations, interpretations or guidance, (viii) fluctuations in foreign currency exchange rates, (ix) litigation, (x) general economic conditions, and (xi) other risks as detailed in Synopsys’ SEC filings, including those described in the “Risk Factors” section in its latest Quarterly Report on Form 10-Q for the fiscal quarter ended July 31, 2014. Furthermore, Synopsys’ actual tax rates applied to income for the first quarter and fiscal year 2015 could differ from the targets given in this press release as a result of a number of factors, including the actual geographic mix of revenue during the quarter and year, and actions by the government. Finally, Synopsys’ targets for outstanding shares in the first quarter and fiscal year 2015 could differ from the targets given in this press release as a result of higher than expected employee stock plan issuances or stock option exercises, acquisitions, and the extent of Synopsys’ stock repurchase activity.

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Synopsys is under no obligation to (and expressly disclaims any such obligation to) update or alter any of the forward-looking statements made in this earnings release, the conference call, the financial supplement, or the corporate overview presentation whether as a result of new information, future events or otherwise, unless otherwise required by law.

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SYNOPSYS, INC.

Unaudited Consolidated Statements of Operations (1)

(in thousands, except per share amounts)

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SYNOPSYS, INC.

Unaudited Consolidated Balance Sheets (1)

(in thousands, except par value amounts)

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SYNOPSYS, INC.

Unaudited Consolidated Statements of Cash Flows (1)

(in thousands)

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