Emerald Energy plc is an energy exploration subsidiary of Chinese state-owned company Sinochem with headquarters in London but is registered offshore in the Isle of Man. The company specialises in oil exploration and production of hydrocarbons. Formerly listed on the London Stock Exchange and a constituent of the FTSE 250 Index, the firm was acquired by Sinochem Group in October 2009. The phone number for any ex-shareholder questions is 020 7930 7060.