Forty Seven, Inc. develops therapies that target cancer immune evasion pathways. It develops Hu5F9-G4, a monoclonal antibody against human CD47 that potentially has applications spanning multiple tumor types and treatment modalities. The company was founded by Irving L. Weissman, Ravi Majeti, Mark Chao and Jens-Peter Volkmer in 2014 and is headquartered in Menlo Park, CA.