Yanchang Petroleum International Limited is an investment holding company involved in the supply and procurement of oil-related products in the People's Republic of China, Canada, Hong Kong, and internationally. It operates through two segments: Exploration, Exploitation and Operation Business, and Supply and Procurement Business. The company is engaged in the wholesale, retail, storage, and distribution of refined oil, as well as the acquisition, exploration, exploitation, development, and production of crude oil and natural gas. It also trades fuel oil and oil-related products and holds interests in oilfield blocks in Canada. Formerly known as Sino Union Energy Investment Group Limited, it changed its name to Yanchang Petroleum International Limited in May 2012. Incorporated in 2001, it is headquartered in Causeway Bay, Hong Kong, and is a subsidiary of Yanchang Petroleum Group (Hong Kong) Co., Limited.