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.

Applus Services SA is a Spain-based company that provides inspection, testing and quality assurance services. The Company's activities are divided into five segments: Applus+ RTD, which provides non-destructive testing services mainly to the oil industry; Applus+ Velosi-Norcontrol, which offers solutions for technical assistance, supervision, inspection, quality control testing, certification and consulting services mainly to industrial, electrical, oil and telecommunications facilities; Applus+ Laboratories, which focuses on laboratory testing, system certification and product development services within aerospace, industrial and consumer goods sectors, among others; Applus+ Automotive, which is responsible for the vehicle roadworthiness testing services, and Applus+ IDIADA, which delivers design, engineering, testing and certification services mainly to car manufacturers. The Company operates in Europe, Africa, Asia and the Americas.

Cellnex Telecom SA is a Spain-based company engaged in the wireless telecommunications (telecom) business. Its activities are divided into three segments: Broadcasting infrastructure, Telecom site rental, as well as Network services and other. The Broadcasting infrastructure division comprises distribution and transmission of television (TV) and frequency modulation (FM) radio signals, operation and maintenance (O&M) of radio broadcasting network, as well as over-the-top (OTT) radio services, among others. The Telecom site rental division provides access to wireless infrastructure, primarily through infrastructure hosting and telecom equipment co-location, mainly for mobile network operators and other wireless and broadband telecom network operators. The Network services and other division offers connectivity services for a variety of telecom operators and radio communication, among others. The Company also develops 5th generation mobile networks (5G) through Alticom BV.

Endesa is engaged in the production, transmission, distribution, and supply of electricity, through hydroelectric, fossil fuel, and nuclear generation. Co. is also engaged in the mining of coal for use in its fossil-fuel electric plants; mining research; land restoration, and environmental monitoring and control.

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.

Global Dominion Access SA is a Spain-based company primarily engaged in the construction and engineering sector. The Company's activities are divided into two segments: Multi-technological Services, which offers design, implementation and maintenance of fixed and mobile telecommunications networks, manages sales and distribution processes for telecommunications carriers, as well as renders of inspection, maintenance, repair and renovation services for industrial and energy firms, and Solutions and EPCs, which executes turnkey Engineering-Procurement-Construction (EPC) projects, provides construction, repair and renovation of industrial heating installations, as well as develops processes and other technological and business solutions in numerous sectors. Its services are provided in three areas: Technology and Telecommunications (T&T), Industry and Renewable energies. It operates worldwide in Europe, the Americas, Asia and Africa. The Company is a subsidiary of CIE Automotive SA.

Iberdrola is a holding company. Through its subsidiaries, Co. operates in four segments: network business, which includes all the energy transmission and distribution activities, and other regulated activity originated in Spain, the U.K., the U.S. and Brazil; deregulated business, which includes electricity generation and sales businesses as well as gas trading and storage businesses carried on by Co. in Spain, Portugal, the U.K. and North America; renewable business, with activities related to renewable energies in Spain, the U.K., the U.S. and the rest of the world; and other businesses, including the engineering and construction businesses and the non-power businesses.

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

Obrascon Huarte Lain is an international concession and construction groups based in Spain. Co. maintains significant operations in 30 countries across all five continents. Co. is engaged in hospital and railway construction, transport infrastructure concessions, oil and gas, energy, solids handling and fire protection systems and international contracts. Co.'s operations are organized along four divisions: OHL Concesiones, OHL Construccion, OHL Industrial y OHL Desarrollos. Co. is also engaged in real state project developments of mixed use managed by the international hotel chains.

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.