MENT Mentor Graphics Corp.

Mentor Graphics Corp. (NASDAQ: MENT), a leading electronic design automation (EDA) solutions provider, today announced its intention to redeem on October 12, 2010 (the "Redemption Date"), any and all remaining outstanding Floating Rate Convertible Subordinated Debentures due 2023 as of October 12, 2010, at a total redemption price of 100% of the aggregate principal amount outstanding thereof, plus accrued and unpaid interest, if any, to but not including the Redemption Date.

This release contains forward-looking statements, which are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Investors are cautioned that forward-looking statements in this release involve risks and uncertainty that could cause actual results to differ materially from current expectations.

About Mentor Graphics Mentor Graphics Corporation (NASDAQ: MENT) 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 electronics and semiconductor companies. Established in 1981, the company reported revenues over the last 12 months of about $800 million. Corporate headquarters are located at 8005 S.W. Boeckman Road, Wilsonville, Oregon 97070-7777. World Wide Web site: http://www.mentor.com/.

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For more information, please contact: Ethan Manuel Corporate Treasurer 503.685.7807 ethan_manuel@mentor.com Ryerson Schwark Media Relations 503.685.1660 ry_schwark@mentor.com