Amgen, established in 1980, is a multinational biopharmaceutical company headquartered in the Newbury Park area of Thousand Oaks which is in the Conejo Valley and Ventura County. The firm's stock is traded on the NASDAQ and the company employs over 20,000 people including more than 8,300 in Newbury Park. It is one of the largest employers in Ventura County and is the world's largest independent biotechnology firm. Amgen has a consistent history of making generous contributions to the community.