EXHIBIT 32 CERTIFICATION UNDER SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 Jay T. Flatley and Timothy M. Kish hereby certify that: 1. They are the Chief Executive Officer and Chief Financial Officer, respectively, of Illumina, Inc. 2. The quarterly report on Form 10-Q of Illumina, Inc. that this certification accompanies fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934. 3. The information contained in the quarterly report on Form 10-Q of Illumina, Inc. that this certification accompanies fairly presents, in all material respects, the financial condition and results of operations of Illumina, Inc. Dated: August 6, 2004 By: /s/ JAY T. FLATLEY -------------------------------------- Jay T. Flatley President and Chief Executive Officer By: /s/ TIMOTHY M. KISH -------------------------------------- Timothy M. Kish Vice President and Chief Financial Officer 36