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.

Ence Energia Y Celulosa is engaged in the manufacture and commercialization of wood pulp and derivatives. Co. divides its activities into the following two business lines: Forest Division: Co. manages timberlands in South America and the Iberian Peninsula. Co. is involved in trading of wood, and supplies solid wood products including: plywood, sawn timber, parquet flooring and glued-edge paneling. Co. is involved in forest and environmental consulting. Pulp Division and Energy Production: Co. is engaged in the production of Eucalyptus globulus-based TCF and ECF paper pulp. Co. is also involved in the generation of electricity through biomass power producing plants.

Fomento de Construcciones y Contratas is the parent company of a group engaged in sanitation services, cleaning, maintaining, purification and distribution of water, construction of highways, hydraulic works, marine works, air and rail transport infrastructure, urban developments, housing, non-residential buildings, office buildings, toll highways, parking garages, marinas and water treatment plants. Co. is also engaged in the manufacture and sale of cement and cement infrastructures, such as precast concrete elements; and in the financial markets, and real estate development, leasing and tourism.

Melia Hotels International is the parent company of a group engaged in the acquisition, management and operation of hotels. Co. operates its hotel network in Germany, Argentina, Brazil, Bulgaria, Cabo Verde, Chile, China, Costa Rica, Croatia, Cuba, Egypt, Spain, United States, France, Greece, Netherlands, Indonesia, Italy, Luxembourg, Malaysia, Mexico, Panama, Peru, Portugal, Puerto Rico, United Kingdom, Dominican Republic, Singapore, Switzerland, Tunisia, Uruguay, Venezuela and Vietnam under the followings brandnames: Paradisus Resorts®, Melia Hotels & Resorts®, TRYP Hoteles® and Sol Hotels & Resorts®.

NH Hotel is engaged in the operation and management of hotels throughout Spain, the Benelux countries, Germany, and South America.

Red Electrica is engaged in the transmission of electrical energy, the operation of the system and the management of the transmission network in the Spanish electricity system. In addition, through its subsidiaries, Co. is engaged in the acquisition, holding and management of foreign securities, co-ordination of international exchanges, provision of telecommunications services for third parties, provision of consultancy, engineering and construction services outside the Spanish electricity system, securing of funds, carrying out of financial transactions and provision of financial services.