Penta-Ocean Construction Co., Ltd. is engaged in civil engineering and building construction activities in Japan, Southeast Asia, and other international markets. It operates through three segments: Domestic Civil Engineering, Domestic Building Construction, and Overseas. Its services cover ports and harbors, airports, power stations, dams and river works, water supply and sewerage, bridges, roads and tunnels, railways, and a range of environmental, industrial, logistics, recreational, office, commercial, lodging, residential, educational, medical, and health and welfare facilities. The company is also involved in domestic real estate development, shipbuilding, leasing, insurance, and environment-related businesses. Founded in 1896, it is headquartered in Tokyo, Japan.