Gilead Sciences, Inc. is a biopharmaceutical company, which engages in the research, development, and commercialization of medicines in areas of unmet medical need. The firm's primary areas of focus include human immunodeficiency virus, acquired immunodeficiency syndrome, liver diseases, hematology, oncology, and inflammation and respiratory diseases. It offers antiviral products under Harvoni, Genvoya, Epclusa, Truvada, Atripla, Descovy, Stribild, Viread, Odefsey, Complera/Eviplera, Sovaldi, and Vosevi brands. The company was founded by Michael L. Riordan on June 22, 1987 and is headquartered in Foster City, CA.