San Diego, California, USA
January 25, 2012

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, tonight acknowledged the announcement by Roche (RHHBY.PK) that Roche has made an unsolicited acquisition proposal and intends to commence a tender offer to acquire all of the outstanding shares of Illumina’s common stock for $44.50 per share in cash.

Consistent with its fiduciary duties and responsibilities, and in consultation with its financial and legal advisors, Illumina’s Board of Directors will thoroughly review Roche’s proposal and make a recommendation to stockholders in due course that the Board believes is in the best interests of Illumina stockholders. Illumina stockholders are advised to take no action at this time pending the Board’s recommendation.

Goldman, Sachs & Co. and Bank of America Merrill Lynch are acting as financial advisors and Dewey & LeBoeuf LLP is acting as legal counsel to Illumina.

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Published: January 25, 2012