NantKwest, Inc., a clinical-stage immunotherapy company, develops immunotherapeutic treatments for cancer and viral infectious diseases in the United States. The company develops activated natural killer (aNK) 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 (haNK) product candidates primarily for the treatment of various cancers; and tank and t-haNK product candidates to treat solid tumors. NantKwest, Inc. has a co-development agreement with Altor BioScience, LLC 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.