Amgen Inc. (formerly Applied Molecular Genetics Inc.) is an American multinational biopharmaceutical company headquartered in Thousand Oaks, California. In 2013, the company's largest selling product lines were Neulasta/Neupogen, two closely related drugs used to prevent infections in patients undergoing cancer chemotherapy; and Enbrel, a tumor necrosis factor blocker used in the treatment of rheumatoid arthritis and other autoimmune diseases. Other products include Epogen, Aranesp, Sensipar/Mimpara, Nplate, Vectibix, Prolia and XGEVA.
Amgen, which is one of the world's largest biotechnology companies, was established in Newbury Park, California in 1980, where its world headquarters are located. It had 5,125 employees in Thousand Oaks as of 2017, which made up 7.5% of the city's total employment. It is the largest employer in Ventura County. Amgen has attracted hundreds of scientists to the Newbury Park area. Focused on the cutting edge of molecular biology and biochemistry, its goal is to provide a healthcare business based on recombinant DNA technology.