Vaccinex, Inc., a clinical-stage biotechnology company, engages in the discovery and development of targeted biotherapeutics to treat cancer, neurodegenerative diseases, and autoimmune disorders. The company's lead drug candidate, pepinemab, a humanized monoclonal antibody that binds and blocks the activity of SEMA4D. Its Pepinemab is being evaluated in a Phase 1b/2 study in recurrent or metastatic head and neck cancer and in a Phase 1/2a study in Alzheimer's Disease, with ongoing exploration of potential Phase 3 development in Huntington's disease.

It has also developed ActivMAb, an antibody drug discovery platform based on a novel method for complex targets, such as multi-pass membrane receptors or large and diverse libraries of full-length human monoclonal antibodies on the surface of pox viruses.