Gilead Sciences, Inc. is an American biopharmaceutical company headquartered in Foster City, California, that focuses on researching, developing, and commercializing therapeutics for life-threatening diseases. The company is best known for its antiviral drugs used in the treatment of HIV/AIDS, hepatitis B, hepatitis C, and COVID-19. In recent years, Gilead has expanded its portfolio to include oncology and cell therapy treatments. The company operates globally, providing medicines to address unmet medical needs across various therapeutic areas.
Historically, approximately 90% of Gilead's gross product sales in the U.S. have been to three large wholesalers - Cardinal Health, Cencora and McKesson - and their specialty distributor affiliates. In fiscal 2025, as a percentage of total gross product sales, Cardinal Health accounted for 29%, McKesson 24% and Cencora 21% (per the 10-K 'Revenues from Major Customers' disclosure).