Amgen Inc. is an American multinational biopharmaceutical company headquartered in Thousand Oaks, California. One of the world's largest independent biotechnology companies, Amgen's Thousand Oaks staff in 2022 numbered approximately 5,000 and included hundreds of scientists, making Amgen the largest employer in Ventura County. As of 2022, Amgen has approximately 24,000 staff in total. In 2019, the company's largest selling products were Enbrel, a tumor necrosis factor blocker used in the treatment of rheumatoid arthritis and other autoimmune diseases, and Neulasta, an immunostimulator used to prevent infections in patients undergoing cancer chemotherapy. Other marketed products include Evenity, Otezla, Prolia, Repatha, and Lumakras. Wikipedia