Arcus Biosciences, Inc. is a clinical-stage biopharmaceutical company, which engages in the development and commercialization of immunotherapies. It competes in the segments of the pharmaceutical, biotechnology, and other related markets that develop immunotherapies for the treatment of cancer. The company was founded by Terry J. Rosen and Juan Carlos Jaen in 2015 and is headquartered in Hayward, CA.