Chugai Pharmaceutical is a Japanese drug developer and subsidiary of Roche Holding, which owns roughly 60% of the company. Founded in 1925, Chugai deals primarily in the Japanese market, where it generates roughly half of its revenue. It has been the leader in Japan's oncology market for the past decade, largely due to drugs licensed from its parent's portfolio. The company also develops its own innovative medicines. It is an industry leader in antibody technology with several flagship therapies, including Hemlibra for hemophilia A patients and tocilizumab for treating rheumatoid arthritis and covid-19 patients.