ILLUMINA INC

During the quarterly period ended March 31, 2024, the following directors and officers adopted, modified or terminated 10b5-1 plans:

•On February 28, 2024, Charles Dadswell, our General Counsel, entered in a new arrangement intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). The arrangement terminates on December 31, 2024 and provides for the sale of up to 16,695 shares.

•On March 8, 2024, Alex Aravanis, our former Chief Technology Officer, Head of Research and Product Development, terminated a trading arrangement he had previously adopted with respect to the sale of securities of the Company’s common stock in connection with his departure from the Company. The arrangement wasadopted on May 9, 2023, had atermination date of May 9, 2024, and provided for the sale of up to 15,486 shares of common stock pursuant to the terms of the plan.

Other than as disclosed above, during the quarterly period ended March 31, 2024, (i) none of the Company’s directors or officers adopted orterminated any “Rule 10b5-1 trading arrangement” or any “non-Rule 10b5-1 trading arrangement,” and (ii) the Company did not adopt a “10b5-1 trading arrangement,” in each case as such term is defined in Item 408 of Regulation S-K.