Zai Lab Ltd. is a biopharmaceutical company. It engages in the discovering, licensing, developing, and commercializing proprietary therapeutics that address areas of unmet medical need in the fields of oncology, infectious, and autoimmune diseases. The firm's products include Zejula and Optune. The company was founded by Samantha Ying Du and Marietta Wu in April 2014 and is headquartered in Shanghai, China.