Gilead Sciences, Inc. is a biopharmaceutical company that engages in the research, development, and commercialization of medicines addressing unmet medical needs. Headquartered in Foster City, California, the company currently employs 17,600 full-time employees. It advances medicines to prevent and treat life-threatening diseases, including HIV, viral hepatitis, COVID-19, cancer, and inflammation. Gilead focuses on discovering, developing, and delivering therapies for unmet needs in virology, oncology, and other therapeutic areas. Its marketed product portfolio includes Biktarvy, Genvoya, Descovy, Complera/Eviplera, Symtuza, Truvada, Stribild, Sunlenca, Epclusa, Vemlidy, Harvoni, Viread, Livdelzi, Veklury, Yescarta, Tecartus, Trodelvy, AmBisome, and Letairis. Product candidates in development include Bulevirtide, Lenacapavir, Axicabtagene ciloleucel, Sacituzumab govitecan-hziy, and others. The company is also advancing the HB-400 and HB-500 programs—therapies intended to deliver functional cures for hepatitis B virus and human immunodeficiency virus-1. Additionally, Gilead has a cancer program named TREX1. The company operates in more than 35 countries worldwide.