Wison Engineering Services Co. Ltd. is an investment holding company principally engaged in the provision of project solutions to coal-to-chemicals producers in terms of design, building and commissioning of their production facilities. The Company operates its business through four segments. The Petrochemicals segment is engaged in the provision of engineering, procurement and construction (EPC) service to ethylene and downstream petrochemicals producers. The Coal-to-Chemicals segment is engaged in the provision of EPC services to coal-to-chemicals producers. The Oil Refineries segment is engaged in the provision of procurement and construction management services to the project owners. The Other Products and Services segment is engaged in the provision of services for other industries, such as fine chemical production facilities and the manufacture of integrated piping systems.