AMCO United Holding Limited, an investment holding company, manufactures and sells medical devices and plastic moulding products in Hong Kong, the People's Republic of China, and internationally. It also offers money lending and management services; and invests in securities. The company was formerly known as Guojin Resources Holdings Limited and changed its name to AMCO United Holding Limited in February 2012. AMCO United Holding Limited was incorporated in 1994 and is based in Central, Hong Kong.