NS United Kaiun Kaisha, Ltd. provides marine transportation services and related businesses in Japan and internationally through its subsidiaries. It operates in two segments: International Shipping Business and Coastal Shipping Business. The International Shipping Business transports materials such as iron ores, coking coals, steel products, and nonferrous metal ores by bulk carriers, LPG and other petroleum products by tankers, and offers vessel leasing, energy resources transport, and tramp chartering services. The Coastal Shipping Business transports steel products, limestone, and cement by bulk carriers in domestic waters, LPG, LNG, and other petroleum products by tankers, and provides vessel leasing. As of June 25, 2025, the company operated a fleet of 140 ocean-going and 80 coastal vessels. Incorporated in 1950, it is headquartered in Tokyo, Japan.