Additional Information and Where to Find It

This document relates to a pending business combination transaction between Microsemi and PMC. The exchange offer referenced in this document has not yet commenced. This document does not constitute an offer to sell or exchange, or the solicitation of an offer to buy or exchange, any securities, nor shall there be any sale of securities in any jurisdiction in which such offer, sale or exchange would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. Microsemi will file a registration statement on Form S-4 related to the transaction with the SEC and may file amendments thereto. Microsemi and a wholly-owned subsidiary of Microsemi will file a tender offer statement on Schedule TO (including a prospectus/offer to exchange, a related letter of transmittal and other exchange offer documents) related to the transaction with the SEC and may file amendments thereto. PMC will file a recommendation statement on Schedule 14D-9 with the SEC and may file amendments thereto. PMC and Microsemi may also file other documents with the SEC regarding the transaction. This document is not a substitute for any registration statement, Schedule TO, Schedule 14D-9 or any other document which PMC or Microsemi may file with the SEC in connection with the transaction. Investors and security holders are urged to read the registration statement, the Schedule TO (including the prospectus/offer to exchange, related letter of transmittal and other exchange offer documents), the recommendation statement on Schedule 14D-9 and the other relevant materials with respect to the transaction carefully and in their entirety when they become available before making any investment decision with respect to the transaction, because they will contain important information about the transaction.

Such materials (and all other offer documents filed with the SEC) will be available at no charge on the SEC's Web site: www.sec.gov. In addition, PMC's stockholders will be able to obtain free copies of such materials by contacting Joel Achramowicz at (408) 239-8630.

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To view the original version on PR Newswire, visit: http://www.prnewswire.com/news-releases/microsemi-corporation-enters-definitive-agreement-to-acquire-pmc-sierra-inc-300183830.html

SOURCE Microsemi Corporation; PMC-Sierra, Inc.