Gilead Sciences, Inc. to Join the Nasdaq-100 Index Beginning October 5, 2001

New York, N.Y.—Gilead Sciences, Inc. (Nasdaq:GILD), of Foster City, California, will become a component of the Nasdaq-100 Index^® (Nasdaq:NDX), effective at the beginning of trading Friday, October 5, 2001. Gilead will also be included in the Nasdaq-100 Index Tracking Stock^SM (Amex:QQQ). Gilead Sciences, Inc. will replace Exodus Communications, Inc. (Nasdaq:EXDS), which is no longer eligible for inclusion in the Index.

With a market capitalization of over $5.1 billion, Gilead Sciences, Inc. is an independent biopharmaceutical company that seeks to provide accelerated solutions for patients and the people who care for them. Gilead discovers, develops, manufactures and commercializes proprietary therapeutics for challenging infectious diseases (viral, fungal and bacterial infections) and cancer.

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