Nektar Therapeutics is a biopharmaceutical company focused on discovering and developing immunotherapy medicines in the United States and internationally. Its pipeline includes rezpegaldesleukin, in Phase 2b for immune system imbalance in autoimmune and inflammatory diseases; NKTR-0165 for ulcerative colitis, vitiligo, and multiple sclerosis; NKTR-0166 for autoimmune disease; NKTR-422 for fibrotic diseases; and NKTR-255 for solid tumors and large B-cell lymphoma. The company has collaboration agreements with Takeda Pharmaceutical Company Ltd., AstraZeneca AB, UCB Pharma, F. Hoffmann-La Roche Ltd., Bausch Health Companies Inc., Pfizer Inc., UCB Pharma (Biogen), Bristol-Myers Squibb Company, and Merck KGaA. Incorporated in 1990, it is headquartered in San Francisco, California.