Costain Group PLC is a United Kingdom-based sustainable infrastructure solution company. The Company offers a range of services across the whole lifecycle of its customers’ assets. The Company operates through two segments: Natural Resources and Transportation. The Company offers various services, such as consultancy and advisory, digital technology solutions, and complex program delivery. The Company shape, create and deliver pioneering solutions that transform the performance of the infrastructure ecosystem. It is focused on four strategic markets in the United Kingdom: transport, water, energy, and defense. The Company is involved in research and development in its highways, integrated transport, aviation, energy, defense, water, and rail sectors. Its energy services include energy transition, oil and gas, electricity and gas networks, and industrial cooling. The sectors it operates in are rail, integrated transport, road, water, aviation, and defense and nuclear energy.