Press Release

Illumina Announces Preliminary Revenue for First Quarter 2012

Strong Demand Drives Book-to-Bill to 1.1

SAN DIEGO--(BUSINESS WIRE)--Apr. 2, 2012-- Illumina, Inc. (NASDAQ:ILMN) today announced estimated first quarter revenue of approximately $270 million. This number is based on a preliminary estimate and remains subject to review by Illumina’s independent registered public accounting firm. Analysis of the remainder of the income statement is incomplete, but the company expects non-GAAP EPS to be at or above current consensus estimates. Full quarterly results will be announced later this month.

"We are very pleased with our preliminary revenue results and the ability of the company to focus and execute this quarter. This is our third consecutive quarter with a book-to-bill over 1, and we are very encouraged by evidence that our customers are getting back to work," said Jay Flatley, President & CEO of Illumina. "Our annualized HiSeq consumable pull-through grew to approximately $300,000 per instrument in Q1, a very encouraging trend."

Use of forward-looking statements

This release contains projections, information about our financial outlook, earnings guidance, and other forward-looking statements that involve risks and uncertainties. These forward-looking statements are based on our expectations as of the date of this release and may differ materially from actual future events or results. Among the important factors that could cause actual results to differ materially from those in any forward-looking statements are (i) our ability to develop and commercialize further our sequencing, array, PCR, and consumables technologies and to deploy new products and applications, and expand the markets, for our technology platforms; (ii) our ability to manufacture robust instrumentation and consumables; (iii) our expectations and beliefs regarding future conduct and growth of the business and the markets in which we operate; (iv) challenges inherent in developing, manufacturing, and launching new products and services; (v) business disruptions associated with the tender offer commenced by CKH Acquisition Corporation, a wholly owned subsidiary of Roche Holding Ltd; (vi) our ability to maintain our revenue and profitability during periods of research funding reduction or uncertainty and adverse economic and business conditions, including as a result of slowing economic growth in the United States or worldwide, together with other factors detailed in our filings with the Securities and Exchange Commission, including our most recent filings on Forms 10-K and 10-Q, or in information disclosed in public conference calls, the date and time of which are released beforehand. We undertake no obligation, and do not intend, to update these forward-looking statements, to review or confirm analysts’ expectations, or to provide interim reports or updates on the progress of the current financial quarter.

About Illumina

Illumina (www.illumina.com) is a leading developer, manufacturer, and marketer of life science tools and integrated systems for the analysis of genetic variation and function. We provide innovative sequencing and array-based solutions for genotyping, copy number variation analysis, methylation studies, gene expression profiling, and low-multiplex analysis of DNA, RNA and protein. We also provide tools and services that are fueling advances in consumer genomics and diagnostics. Our technology and products accelerate genetic analysis research and its application, paving the way for molecular medicine and ultimately transforming healthcare.

ADDITIONAL INFORMATION AND WHERE TO FIND IT

This communication does not constitute an offer to buy or a solicitation of an offer to sell any securities. In response to the tender offer commenced by CKH Acquisition Corporation, a wholly owned subsidiary of Roche Holding Ltd, Illumina has filed a solicitation/recommendation statement on Schedule 14D-9 with the SEC. INVESTORS AND SECURITY HOLDERS OF ILLUMINA ARE URGED TO READ THE SOLICITATION/RECOMMENDATION STATEMENT AND OTHER DOCUMENTS FILED WITH THE SEC (WHEN THEY BECOME AVAILABLE) CAREFULLY IN THEIR ENTIRETY BECAUSE THEY CONTAIN IMPORTANT INFORMATION. Investors and security holders are able to obtain free copies of these documents and other documents filed with the SEC by Illumina (when they become available) through the web site maintained by the SEC at http://www.sec.gov. Investors and security holders also are able to obtain free copies of these documents, and other documents filed with the SEC by Illumina (when they become available), from Illumina by directing a request to Illumina, Inc., Attn: Investor Relations, Kevin Williams, MD, kwilliams@illumina.com.

In addition, in connection with its 2012 Annual Meeting of Stockholders, Illumina has filed a definitive proxy statement and a WHITE proxy card with the SEC on March 19, 2012, and has mailed the definitive proxy statement and WHITE proxy card to its security holders. INVESTORS AND SECURITY HOLDERS OF ILLUMINA ARE URGED TO READ THE DEFINITIVE PROXY STATEMENT AND THE WHITE PROXY CARD FOR THE 2012 ANNUAL MEETING OF STOCKHOLDERS AND OTHER DOCUMENTS FILED WITH THE SEC (WHEN THEY BECOME AVAILABLE) CAREFULLY IN THEIR ENTIRETY BECAUSE THEY CONTAIN IMPORTANT INFORMATION. Investors and security holders are able to obtain free copies of the definitive proxy statement and other documents filed with the SEC by Illumina (when they become available) through the web site maintained by the SEC at http://www.sec.gov. Investors and security holders also are able to obtain free copies of the definitive proxy statement, and other documents filed with the SEC by Illumina (when they become available), from Illumina by directing a request to Illumina, Inc., Attn: Investor Relations, Kevin Williams, MD, kwilliams@illumina.com.

CERTAIN INFORMATION REGARDING PARTICIPANTS IN THE SOLICITATION

Illumina and certain of its directors and executive officers may be deemed to be participants in the solicitation of proxies in connection with Illumina’s 2012 Annual Meeting of Stockholders under the rules of the SEC. Security holders may obtain information regarding the names, affiliations and direct and indirect interests (by security holdings or otherwise) of Illumina’s directors and executive officers in (i) Illumina’s Annual Report on Form 10-K for the year ended January 1, 2012, which was filed with the SEC on February 24, 2012, and (ii) Illumina’s definitive proxy statement for its 2012 Annual Meeting of Stockholders, which was filed with the SEC on March 19, 2012. To the extent that Illumina’s directors’ and executive officers’ holdings of Illumina’s securities have changed from the amounts printed in the definitive proxy statement for the 2012 Annual Meeting of Stockholders, such changes have been or will be reflected on Statements of Changes in Beneficial Ownership on Form 4 filed with the SEC. These documents can be obtained free of charge from the sources indicated above.

Source: Illumina, Inc.

Illumina, Inc.
Investors:
Kevin Williams, MD
Investor Relations
858-332-4989
kwilliams@illumina.com
or
Media:
Jennifer Temple
Public Relations
858-429-8650
pr@illumina.com

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