DISA Ltd. is an investment holding company which engages in technology development. It operates through the following segments: Supply of Construction Materials, Energy Management Services, Technology, and Investment Holding and Others. The Supply of Construction Materials segment involves in the business of supplying and trading of construction materials including sand, granite and coal. The Energy Management Services segment provides sustainable energy management solutions to the building industry in Singapore and to the region. The Technology segment focuses in research and development of cutting-edge security solution. The company was founded by Weng Wah Chng on June 26, 1975 and is headquartered in Singapore.