Celldex Therapeutics, Inc., a biopharmaceutical company, engages in developing therapeutic monoclonal and bispecific antibodies for the treatment of various diseases.

Its drug candidates include antibody-based therapeutics to treat patients with inflammatory diseases and various forms of cancer.

The company's clinical development programs CDX-0159, a Phase II monoclonal antibody that binds the receptor tyrosine kinase KIT and inhibits its activity; CDX-1140, a human agonist monoclonal antibody targeted to CD40, a key activator of immune response, which is found on dendritic cells, macrophages, and B cells, as well as is expressed on various cancer cells; and CDX-527, a bispecific antibody, which uses the company's proprietary active anti-PD-L1 and CD27 human antibodies to couple CD27 costimulation with blockade of the PD-L1/PD-1 pathway to help prime and activate anti-tumor T cell responses through CD27 costimulation.

It has research collaboration and license agreements with University of Southampton to develop human antibodies towards CD27; Amgen Inc. with exclusive rights to CDX-301 and CD40 ligand; and Yale University.

The company was incorporated in 1983 and is headquartered in Hampton, New Jersey.