Essex Bio-Technology Limited is an investment holding company that develops, manufactures, and sells biologic drugs in China, Hong Kong, and internationally. It operates through Ophthalmology, Surgical, and Healthcare and Partner Services segments. The company researches and develops therapeutic fibroblast growth factor products and offers a range of pharmaceutical and medical device products, including eye drops, gels, artificial dermis, and dental care items. It also has license agreements with Mitotech S.A. and Shanghai Henlius Biotech Inc. Founded in 1990, it is headquartered in Zhuhai, China.