ACS Actividades de Construccion y Servicios is a holding company. Through its subsidiaries, Co.'s activities are divided into the following areas: Construction, engaged in the construction of civil works, and residential and non-residential building construction; industrial services, engaged in the development of applied engineering services, installations and the maintenance of industrial infrastructures in the energy, communications and control systems sectors; services, groups together environmental services, the outsourcing of building maintenance services, logistics and transport services; and concessions, mainly engaged in transport infrastructure concessions.

Aena SME SA, formerly Aena SA, is a Spain-based company primarily engaged in the airports operation. Its activities are divided into four segments: Airports, which comprises Aeronautical subdivision, responsible for the management of airports, jetways, security, handling, cargo and fuel services, among others, as well as Commercial subdivision, including duty-free and specialty stores, restaurant services, car rental, as well as banking services and advertising; Services outside the terminal, which manages real estate assets, such as parking lots, warehouses and lands; International, which comprises operations of Company's subsidiary, Aena Desarrollo Internacional SA, that invests in other airport owners principally in Mexico, Colombia and the United Kingdom; and Others, encompassing corporate activities. It manages tourism, hub and regional airports, as well as heliports and general aviation areas. Furthermore, its destination range comprises Europe, the Americas, Asia and Africa.

Euskaltel SA is a Spain-based company engaged in the provision of integrated telecommunication services. The Company's activities are divided into three segments: Residential, Business, as well as Wholesale and Other. The Residential segment provides fixed and mobile telecommunication services, broadband and wireless Internet, as well as digital television (TV) as a single service and in packages. The Business division primarily offers fixed and mobile telephony, as well as Internet access for enterprises. The Wholesale and Other area serves wholesale customers and is responsible for the delivery of communication services, such as infrastructure leasing, information technology (IT) outsourcing, as well as sell of installation material and electronics. The Company operates in the Basque Country, Spain.

Ferrovial is a transportation company based in Spain. Co. is engaged in operations in the transportation sector. Co. specializes in the design, construction, management, administration and maintenance of transport infrastructures. Co.'s services range also includes the maintenance of parking lots, and land-, sea- and air-based transport networks. Co. is also engaged in the promotion and operation of short-stay parking lots, parking regulation and management services and promotion and sale of residents' parking.

Fluidra is engaged in the manufacture and commercialization of accessories and specific products for swimming pools, irrigation, and water treatment and purification systems.