Illumina’s Board of Directors Sends Fourth Letter to Stockholders

RECOMMENDS STOCKHOLDERS REJECT ROCHE’S OFFER AND VOTE WHITE PROXY CARD

SAN DIEGO — Illumina, Inc. (NASDAQ:ILMN), a leading developer, manufacturer, and marketer of life science tools and integrated systems for the analysis of genetic variation and function, today is sending a letter from its Board of Directors highlighting supportive reports issued by two of the nation’s leading proxy advisor firms. Illumina’s Board recommends that stockholders reject Roche’s offer and vote for the election of Illumina’s highly qualified nominees at its 2012 Annual Meeting of Stockholders by completing the WHITE proxy card today.

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