Compass Therapeutics, Inc., a clinical-stage oncology-focused biopharmaceutical company, engages in developing antibody-based therapeutics to treat various human diseases. The company's product candidates in the clinical stage of development include CTX-009, an investigational bispecific antibody that blocks Delta-like ligand 4/Notch and vascular endothelial growth factor A signaling pathways, which are critical to angiogenesis and tumor vascularization; and CTX-471, an IgG4 monoclonal antibody that is an agonist of CD137. Its product candidates also comprise CTX-8371, a bispecific inhibitor that targets PD-1 and PD-L1. The company was founded in 2014 and is headquartered in Boston, Massachusetts.