Domestic Group Companies

• Tamano Consultants Co., Ltd.
• Nippon Civic Consulting Engineers Co., Ltd.
• DSI Co., Ltd.
• Aichi Tamano Information system Co., Ltd
• KRI International Corporation
• Nippon Koei U. K. Co., Ltd.
• Nippon Koei Latin America-Caribbean Co., Ltd.
• Flexible Energy Service Co., Ltd.
• Nikki Corporation
• Koei System Inc.
• El Koei Co., Ltd.

Overseas Affiliated Companies

• NIPPON KOEI LAC, INC.(Panama)
• NIPPON KOEI LAC DO BRASIL LTDA.(Brasil)
• NIPPON KOEI INDIA PRIVATE LIMITED(India)
• P.T. INDOKOEI INTERNATIONAL(Indonesia)
• THAIKOEI INTERNATIONAL CO.,LTD.(Thailand)
• DSI VIETNAM CO.,LTD.(Viet Nam)
• PT.IKI-TOYO(Indonesia)
• NIPPON KOEI AUSTRALIA PTY.LTD.(Australia)
• PHILKOEI INTERNATIONAL, INC.(Philippines)
• VEC CONSULTANTS JSC(Viet Nam)