NantKwest, Inc., a clinical-stage immunotherapy biotechnology company, develops immunotherapeutic treatments for cancer, infectious diseases, and inflammatory diseases in the United States. The company develops activated natural killer cell, a natural killer cell-line and genetically modified derivative capable of killing cancer and virally infected cells; and NANT cancer vaccine, a personalized therapy that utilizes its off-the-shelf natural killer cells. It is also developing high-affinity natural killer product candidates primarily for the treatment of various cancers; and target activated natural killer product candidates to treat hematological malignancies and solid tumors. NantKwest, Inc. has a co-development agreement with Altor Bio Science Corporation to collaborate on the development of therapeutic applications combining the company's proprietary natural killer cells with Altor's ALT-801 and/or ALT-803 products. The company was formerly known as Conkwest, Inc. and changed its name to NantKwest, Inc. in July 2015. NantKwest, Inc. was founded in 2002 and is headquartered in San Diego, California.