Exelixis, Inc. is an oncology-focused biotechnology company, which primarily focuses on the discovery, development and commercialization of new drugs for the treatment of difficult-to-treat cancers. The company has four approved drugs in its portfolio. Of these, two are derived from cabozantinib, the company's flagship molecule, which is an inhibitor of multiple tyrosine kinases, including MET, AXL, VEGF receptors and RET.