AMCO United Holding Limited, an investment holding company, manufactures and sells medical devices and plastic molding products in Hong Kong and internationally. It also offers construction services in the areas of building construction, building maintenance and improvement works, project management, renovation, and decoration works; provides money lending 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.