Simplex Infrastructures Ltd. is a holding company, which engages in the provision of diversified construction business. It offers both design-and-build, and build-to-design construction services across India and overseas. It operates through the Roads, Railway and Bridges, Buildings, Industry, Power and Transmission, Marine, Ground Engineering and Urban Infra segments. The company was founded in 1924 and is headquartered in Kolkata, India.