- Business
- Integrated Design & Engineering Holdings Co., Ltd. Integrated Design & Engineering Holdings Co., Ltd. (9161:TYO) serves as a holding company that oversees engineering consulting, urban spatial development, and energy solutions primarily through its subsidiaries in Japan and internationally. Founded in 1946 and headquartered at 5-4 Kojimachi, Chiyoda-ku, Tokyo, Japan, the group delivers comprehensive services including construction consulting for social infrastructure such as rivers and water resources, roads, ports and airports, water environment management, transportation planning, railways, geo-hazard mitigation, defense infrastructure, and satellite intelligence centers; urban and spatial development encompassing community planning, architecture, environmental revitalization, roads and structures, disaster preparedness, geology, water engineering, surveying, landscape design, water supply and sewerage, and compensation services; as well as energy business activities focused on research, development, design, construction, management, and operation of power generation projects including electricity storage, renewable energy aggregation, hydropower maintenance, equipment manufacturing, and mechanical, electrical, and information consulting. Key subsidiaries include Nippon Koei Co., Ltd., Nippon Koei Urban Space Co., Ltd., Nippon Koei Energy Solutions Co., Ltd., Building Design Partnership Limited in the United Kingdom, and various international affiliates in Latin America, Africa, Asia, and Europe such as NIPPON KOEI INDIA PVT. LTD., KOEI AFRICA COMPANY LIMITED, and PT.INDOKOEI INTERNATIONAL. The company maintains a global footprint with operations across Japan, the United States, United Kingdom, Netherlands, Panama, Mexico, Brazil, Mozambique, India, Bangladesh, Vietnam, Philippines, Indonesia, Myanmar, Kenya, Malaysia, and Australia. Established as a holding company on July 3, 2023, following a reorganization of the former Nippon Koei Co., Ltd., it listed on the Tokyo Stock Exchange and recently became a subsidiary of Tokio Marine Holdings, Inc. Tokio Marine Holdings, Inc. through a tender offer completed on February 5, 2025, acquiring the remaining 99.70% stake for ¥97.8 billion.