Ko Yo Chemical (Group) Limited is an investment holding company engaged in the research, development, manufacture, marketing, and distribution of chemical products and chemical fertilizers in the People's Republic of China. Its products include urea, ammonia, methanol, N-methylpyrrolidone, and N,N-dimethylformamide. The company is also involved in phosphorous mine exploration and exploitation, the production of phosphoric acid and propylene oxide, and the manufacture and sale of engineering plastics. Incorporated in 2002, it is headquartered in Causeway Bay, Hong Kong.