Exhibit 99.1

Mentor Graphics Reports Fiscal Third Quarter Results

WILSONVILLE, Ore.--(BUSINESS WIRE)--November 17, 2011--Mentor Graphics Corporation (NASDAQ:MENT) today announced financial results for the company’s fiscal third quarter ended October 31, 2011. The company reported revenues of $250.5 million, non-GAAP earnings per share of $.25, and GAAP earnings per share of $.22.

“Bookings were again a record, up over 20% from the previous third quarter record, and for the second consecutive year our book-to-bill through the third quarter is positive,” said Walden C. Rhines, chairman and CEO of Mentor Graphics. “This quarter saw the beginning of the strength we predicted in our Design to Silicon category for the second half, with bookings in the third quarter up year-on-year by over 55%, and by about 15% year to date. Looking forward, we expect the technical challenges of advanced nodes to drive significant opportunity for us.”

During the quarter, the company expanded the Valor® product line with a new business intelligence product. The Mentor® Nucleus® real-time operating system was upgraded to include new power management technology, making it an even more compelling solution for mobile computing and telecommunication. The company also advanced its embedded systems software suite for automobile infotainment with a GENIVI compliant product and a partnership with Freescale Semiconductor. ARM and Mentor announced a joint manufacturing test solution for ARM processor-based designs. NuFlare Technology and Mentor announced a partnership on advanced IC mask generation. The company announced improvements to its design-for-test products that will allow it to find new classes of chip defects. GlobalFoundries and Mentor announced new support for GlobalFoundries’ third generation design sign-off for leading-edge IC manufacturing. The Mentor transportation Capital® product suite won an EDN Hot 100 products of 2011 award.

“Leading indicators for the business continued to be strong, with third quarter support declines down and consulting and training bookings doubling. Annual fees for renewing contracts in the top ten transactions were up 40% over their prior annual fees. Base business, contracts below $1 million in value that booked and billed in the quarter, grew 15% over last year,” said Gregory K. Hinckley, president of Mentor Graphics. “The company’s earnings have historically been very back-end loaded with much of our business closing in the fourth quarter. For the last several years, we have been working with our customers to create more linearity in our financial results, and are pleased with the progress we have been showing. With our newly raised guidance, we now expect 48% of annual non-GAAP earnings to occur in the fourth quarter this fiscal year, compared to 69% in Fiscal 2011.”

Outlook

For the fourth quarter, the company expects revenues of about $316 million, non-GAAP earnings per share of approximately $.50, and GAAP earnings per share of $.46. For the full fiscal year, ending January 31, 2012, the company expects revenues of $1.01 billion, non-GAAP earnings per share of $1.05, and GAAP earnings per share of $.69.

Fiscal Year Definition

The Mentor Graphics fiscal year runs from February 1 to January 31. The fiscal year is dated by the calendar year in which the fiscal year ends. As a result, the first three fiscal quarters of any fiscal year will be dated with the next calendar year, rather than the current calendar year.

Discussion of Non-GAAP Financial Measures

The Mentor Graphics management evaluates and makes operating decisions using various performance measures. In addition to our GAAP results, we also consider adjusted gross margin, operating margin, net income (loss), and earnings (loss) per share which we refer to as non-GAAP gross margin, operating margin, net income (loss), and earnings (loss) per share, respectively. These non-GAAP measures are derived from the revenues of our product, maintenance, and services business operations and the costs directly related to the generation of those revenues, such as cost of revenue, research and development, sales and marketing, and general and administrative expenses, that management considers in evaluating our ongoing core operating performance. These non-GAAP measures exclude amortization of intangible assets, special charges, equity plan-related compensation expenses, interest expense attributable to net retirement premiums or discounts on the early retirement of debt and associated debt issuance costs, interest expense associated with the amortization of debt discount and premium on convertible debt, and the equity in income (loss) of unconsolidated entities (except Frontline PCB Solutions Limited Partnership (Frontline)), which management does not consider reflective of our core operating business.

Management excludes from our non-GAAP measures certain recurring items to facilitate its review of the comparability of our core operating performance on a period-to-period basis because such items are not related to our ongoing core operating performance as viewed by management. Management considers our core operating performance to be that which can be affected by our managers in any particular period through their management of the resources that affect our underlying revenue and profit generating operations during that period. Management uses this view of our operating performance for purposes of comparison with our business plan and individual operating budgets and allocation of resources. Additionally, when evaluating potential acquisitions, management excludes the items described above from its consideration of target performance and valuation. More specifically, management adjusts for the excluded items for the following reasons:

• Identified intangible assets consist primarily of purchased technology, backlog, trade names, and customer relationships. Amortization charges for our intangible assets can vary in frequency and amount due to the timing and magnitude of acquisition transactions. We consider our operating results without these charges when evaluating our core performance due to the variability. Generally, the most significant impact to inter-period comparability of our net income (loss) is in the first twelve months following an acquisition.
• Special charges primarily consist of restructuring costs incurred for employee terminations, including severance and benefits, driven by modifications of business strategy or business emphasis. Special charges may also include expenses incurred related to potential acquisitions, excess facility costs, and asset-related charges. Special charges are incurred based on the particular facts and circumstances of acquisition and restructuring decisions and can vary in size and frequency. These charges are excluded as they are not ordinarily included in our annual operating plan and related budget due to the unpredictability of economic trends and the rapidly changing technology and competitive environment in our industry. We therefore exclude them when evaluating our managers' performance internally.
• Equity plan-related compensation expenses represent the fair value of all share-based payments to employees, including grants of employee stock options and restricted stock units. We do not consider equity plan-related compensation expense in evaluating our manager’s performance internally or our core operations in any given period.

• Interest expense attributable to net retirement premiums or discounts on the early retirement of debt, the write-off of associated debt issuance costs and the amortization of the debt discount and premium on convertible debt are excluded. Management does not consider these charges as a part of our core operating performance. The early retirement of debt and the associated debt issuance costs are not included in our annual operating plan and related budget due to unpredictability of market conditions which could facilitate an early retirement of debt. We do not consider the amortization of the debt discount and premium on convertible debt to be a direct cost of operations.
• In connection with the Company’s acquisition of Valor on March 18, 2010, we also acquired the Valor 50% interest in Frontline, a joint venture. We report our equity in the earnings or losses of Frontline within operating income. We actively participate in regular and periodic activities such as budgeting, business planning, marketing and direction of research and development projects. Accordingly, we do not exclude our share of Frontline’s earnings or losses from our non-GAAP results as management considers the joint venture to be core to our operating performance.
• Equity in earnings or losses of unconsolidated entities, with the exception of our investment in Frontline, represents our equity in the net income (loss) of a common stock investment accounted for under the equity method. The carrying amount of our investment is adjusted for our share of earnings or losses of the investee. The amounts are excluded from our non-GAAP results as we do not control the results of operations for this investment and we do not participate in regular and periodic operating activities; therefore, management does not consider these businesses a part of our core operating performance.
• Income tax expense (benefit) is adjusted by the amount of additional tax expense or benefit that we would accrue if we used non-GAAP results instead of GAAP results in the calculation of our tax liability, taking into consideration our long-term tax structure. We use a normalized effective tax rate of 17%, which reflects the weighted average tax rate applicable under the various jurisdictions in which we operate. This non-GAAP tax rate eliminates the effects of non-recurring and period specific items which are often attributable to acquisition decisions and can vary in size and frequency and considers our U.S. loss carryforwards that have not been previously benefited. This rate is subject to change over time for various reasons, including changes in the geographic business mix and changes in statutory tax rates. Our GAAP tax rate for the nine months ended October 31, 2011 is (20%), after the consideration of period specific items. Without period specific items of ($8.8) million, our GAAP tax rate is 20%. Our full fiscal year 2012 GAAP tax rate, inclusive of period specific items, is projected to be 2%. The GAAP tax rate considers certain mandatory and other non-scalable tax costs which may adversely or beneficially affect our tax rate depending upon our level of profitability in various jurisdictions.

In certain instances our GAAP results of operations may not be profitable when our corresponding non-GAAP results are profitable or vice versa. The number of shares on which our non-GAAP earnings per share is calculated may therefore differ from the GAAP presentation due to the anti-dilutive effect of stock options and restricted stock units in a loss situation.

Non-GAAP gross margin, operating margin, and net income (loss) are supplemental measures of our performance that are not required by, or presented in accordance with, GAAP. Moreover, they should not be considered as an alternative to any performance measure derived in accordance with GAAP, or as an alternative to cash flow from operating activities as a measure of our liquidity. We present non-GAAP gross margin, operating margin, and net income (loss) because we consider them to be important supplemental measures of our operating performance and profitability trends, and because we believe they give investors useful information on period-to-period performance as evaluated by management. Non-GAAP net income (loss) also facilitates comparison with other companies in our industry, which use similar financial measures to supplement their GAAP results. Non-GAAP net income (loss) has limitations as an analytical tool, and therefore should not be considered in isolation or as a substitute for analysis of our results as reported under GAAP. In the future we expect to continue to incur expenses similar to the non-GAAP adjustments described above and exclusion of these items in our non-GAAP presentation should not be construed as an inference that these costs are unusual, infrequent or non-recurring. Some of the limitations in relying on non-GAAP net income (loss) are:

• Amortization of intangibles represents the loss in value as the technology in our industry evolves, is advanced, or is replaced over time. The expense associated with this loss in value is not included in the non-GAAP net income (loss) presentation and therefore does not reflect the full economic effect of the ongoing cost of maintaining our current technological position in our competitive industry, which is addressed through our research and development program.
• We regularly engage in acquisition and assimilation activities as part of our ongoing business and regularly evaluate our businesses to determine whether any operations should be eliminated or curtailed. We therefore will continue to experience special charges on a regular basis. These costs also directly impact our available funds.
• Our stock option and stock purchase plans are important components of our incentive compensation arrangements and will be reflected as expenses in our GAAP results.
• Our income tax expense (benefit) will be ultimately based on our GAAP taxable income and actual tax rates in effect, which often differ significantly from the 17% rate assumed in our non-GAAP presentation. In addition, if we have a GAAP loss and non-GAAP net income, our non-GAAP results will not reflect any projected GAAP tax benefits. Similarly, in the event we were to have GAAP net income and a non-GAAP loss, our GAAP tax expense would be replaced by a credit in our non-GAAP presentation.
• Other companies, including other companies in our industry, calculate non-GAAP net income (loss) differently than we do, limiting its usefulness as a comparative measure.

About Mentor Graphics

Mentor Graphics Corporation is a world leader in electronic hardware and software design solutions, providing products, consulting services and award-winning support for the world’s most successful electronic, semiconductor and systems companies. Established in 1981, the company reported revenues in the last fiscal year of about $915 million. Corporate headquarters are located at 8005 S.W. Boeckman Road, Wilsonville, Oregon 97070-7777. World Wide Web site: http://www.mentor.com/.

(Mentor Graphics, Mentor, Nucleus and Capital are registered trademarks of Mentor Graphics Corporation. All other company and/or product names are the trademarks and/or registered trademarks of their respective owners.)

Statements in this press release regarding the company’s guidance for future periods constitute “forward-looking” statements based on current expectations within the meaning of the Securities Exchange Act of 1934. Such forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause the actual results, performance or achievements of the company or industry results to be materially different from any results, performance or achievements expressed or implied by such forward-looking statements. Such factors include, among others, the following: (i) weakness or recession in the EU, US, Japan, China or other economies, including the possibility of a “double-dip” recession; (ii) the company’s ability to successfully offer products and services that compete in the highly competitive EDA industry, including the risk of obsolescence for our hardware products; (iii) product bundling or discounting of products and services by competitors, which could force the company to lower its prices or offer other more favorable terms to customers; (iv) possible delayed or canceled customer orders resulting from the business disruption and uncertainty of actions of activist shareholders; (v) effects of the volatility of foreign currency fluctuations on the company’s business and operating results; (vi) changes in accounting or reporting rules or interpretations; (vii) the impact of tax audits by the IRS or other taxing authorities, or changes in the tax laws, regulations or enforcement practices where the company does business; (viii) effects of unanticipated shifts in product mix on gross margin; and (ix) effects of customer seasonal purchasing patterns and the timing of significant orders which may negatively or positively impact the company’s quarterly results of operations; all as may be discussed in more detail under the heading “Risk Factors” in the company’s most recent Form 10-K or Form 10-Q. Given these uncertainties, prospective investors are cautioned not to place undue reliance on such forward-looking statements. In addition, statements regarding guidance do not reflect potential impacts of mergers or acquisitions that have not been announced or closed as of the time the statements are made. Mentor Graphics disclaims any obligation to update any such factors or to publicly announce the results of any revisions to any of the forward-looking statements to reflect future events or developments.

CONTACT:
Mentor Graphics Corporation
Media Contact
Ry Schwark, 503-685-1660
ry_schwark@mentor.com
or
Investor Contact
Joe Reinhart, 503-685-1462
joe_reinhart@mentor.com