Sumitomo Mitsui Construction. 

Sumitomo Mitsui Construction Co.,Ltd. engages in the construction business in Japan, rest of Asia, and internationally. The company operates in two segments, Civil Construction and Building Construction. It designs, engineers, and executes civil, building, and pre-stressed concrete works, as well as engages in related operations. The company's construction projects include education facilities; hotels and resort facilities; residential, office, factory, and industrial buildings; dams and plant facilities; roads, railways, and transport facilities; bridges; and traditional historical buildings and structures. It is also involved in the real estate trading, leasing, and management services, as well as undertakes development projects. In addition, the company engages in the solar power and insurance agency business. Sumitomo Mitsui Construction Co.,Ltd. was founded in 1887 and is headquartered in Tokyo, Japan. As of September 18, 2025, Sumitomo Mitsui Construction Co.,Ltd. operates as a subsidiary of INFRONEER Holdings Inc.