Sittichai Kunanantakul

Part of Siam Steel International Public Co. Ltd., Union Autoparts Manufacturing Co. Ltd. is a Thai company that manufactures and distributes automobile parts. The company is based in Samutprakarn, Thailand.

Siam Steel Group International Co., Ltd. is engaged in manufacture and distribution of furniture, construction materials, renewable energy, industrial goods and vehicles. Its products categorized into 6 groups; furniture group, construction materials and prefabricated and modular building group, renewable energy group, industrial goods group, vehicle group and service group. Furniture group includes cabinet, lockers, desks, tables, chairs, safes, shelving system. Construction materials and prefabricated/modular building group includes prefabricated building and modular building, bathroom pods, smart wall system, steel construction solution, part and components for buildings. Renewable energy group includes solar farm, solar rooftop, biomass energy, Refuse Derived Fuel and Palm Kernel Shell. Industrial goods group includes Decorative Laminated Sheet, Honeycomb Core, flood protection panel and related products. Vehicle group includes part and components for automobile and motorcycle. Service group includes rental and service of mobile toilet and unit house. Siam Steel Group International was founded in 1953 and is headquartered in Samut Prakan, Thailand.

Siam International Energy Ltd. invests in renewable energy sources such as solar, biomass, waste to energy, and wind energy. The private company is based in Phrapradaeng, Thailand.