COMSA Corporación is the largest unlisted Spanish group in the infrastructure and engineering sector. Founded in 1891, it is specialized in the construction and maintenance of road and rail transport networks, buildings, hydraulic, port and airport works, as well as in the design and execution of facilities for the industrial sector. Additionally, it offers environmental, technology and renewable energy services. Currently, the group has a turnover of more than 1,000 million euros, manages a workforce over 7,700 employees and is present in 25 countries.