Mah Sing Group Bhd. operates as an investment holding company, which engages in the development of residential and commercial properties; and provision of management services to its subsidiaries. It operates through the following segments: Properties, Plastics, and Investment Holding and Others. The Properties segment invests and develops residential, commercial, and industrial properties. The Plastics segment manufactures, assembles, and sells plastic moulded products. The Investment Holding and Others segment focuses on investment holding operations; provision of management and property support services; and trading of building materials. The company was founded by Hoy Kum Leong in 1965 and is headquartered in Kuala Lumpur, Malaysia.