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Gilead Sciences, Inc. /???li?d/, is an American biotechnology company that researches, develops and commercializes drugs. The company focuses primarily on antiviral drugs used in the treatment of HIV, hepatitis B, hepatitis C, and influenza, including Harvoni and Sovaldi. Headquartered and founded in Foster City, California, Gilead is a member of the NASDAQ Biotechnology Index and the S&P 500.