SAN DIEGO--(BUSINESS WIRE)--May 11, 2006--Illumina, Inc. (NASDAQ:ILMN - News) today announced that it has filed a preliminary prospectus supplement to a shelf registration statement with the Securities and Exchange Commission relating to a proposed public offering of 3,500,000 shares of its common stock. The underwriters will be granted the right to purchase up to an additional 525,000 shares of common stock. All of the shares are being sold by Illumina.