Letter urges Illumina shareholders to tender shares into Roche’s increased offer and vote the GOLD proxy card

Roche (SIX: RO, ROG; OTCQX: RHHBY) today sent a second letter to shareholders of Illumina, Inc. (NASDAQ: ILMN) urging them to tender their shares into Roche’s increased offer and vote for Roche’s independent director nominees and other proposals at the 2012 Illumina annual meeting to be held on 18 April 2012.

About the Offer

On January 27, 2012, Roche commenced a tender offer to acquire all outstanding shares of Illumina for $44.50 per share in cash and increased its offer on March 29, 2012 to $51.00 per share in cash for an aggregate of approximately $6.7 billion on a fully diluted basis. The increased offer represents a substantial premium to Illumina’s unaffected market prices: a premium of 88% over Illumina’s closing stock price on December 21, 2011 – the day before market rumors about a potential transaction between Roche and Illumina drove Illumina’s stock price significantly higher – and an 84% premium over the one-month historical average and a 64% premium over the three-month historical average of Illumina’s share price, both as of December 21, 2011.

In addition to its cash tender offer, Roche has nominated a slate of highly qualified, independent candidates for election to Illumina’s Board of Directors and proposed certain other matters for the consideration of Illumina’s shareholders at Illumina’s 2012 annual meeting, which if adopted, would result in Roche-nominated directors comprising a majority of the Illumina board.

About Roche

Headquartered in Basel, Switzerland, Roche is a leader in research-focused healthcare with combined strengths in pharmaceuticals and diagnostics. Roche is the world’s largest biotech company with truly differentiated medicines in oncology, virology, inflammation, metabolism and CNS. Roche is also the world leader in in-vitro diagnostics, tissue-based cancer diagnostics and a pioneer in diabetes management. Roche’s personalized healthcare strategy aims at providing medicines and diagnostic tools that enable tangible improvements in the health, quality of life and survival of patients. In 2011, Roche had over 80’000 employees worldwide and invested over 8 billion Swiss francs in R&D. The Group posted sales of 42.5 billion Swiss francs. Genentech, United States, is a wholly owned member of the Roche Group. Roche has a majority stake in Chugai Pharmaceutical, Japan. For more information: www.roche.com.