IBEX 35

thumb|Steel being coiled at an ArcelorMittal facility in Brazil

, S.A. () is a Spanish multinational telecommunications company. It has headquarters as well as a registered office in Madrid, Spain. It is one of the largest telephone operators and mobile network providers in the world. It provides fixed and mobile telephony, broadband, and subscription television, operating in Europe and the Americas.

Industria de Diseño Textil, S.A. (Inditex; , ; ) is a Spanish multinational clothing company headquartered in Arteixo, Galicia, Spain. The largest fast fashion group in the world, it operates over 7,200 stores in 93 markets worldwide. The company's predominant brand is Zara, but it also owns a number of other brands including Zara Home, Bershka, Massimo Dutti, Oysho, Pull&Bear, Stradivarius, Uterqüe. The majority of its stores are corporate-owned, while franchises are mainly conceded in countries where corporate properties cannot be foreign-owned.

Repsol S.A. () is a Spanish multinational energy and petrochemical company based in Madrid. It is engaged in worldwide upstream and downstream activities. In the 2022 Forbes Global 2000, Repsol was ranked as the 320th-largest public company in the world. As of 2022, it has 24,000 employees worldwide.

Spanish banking group

British-Spanish multinational airline holding company

bank company based in Cantabria, Spain

Iberdrola, S.A. () is a Spanish multinational electric utility company based in Bilbao, Spain. It has around 40,000 employees and serves around 30 million customers.

blue-chip index consisting of the 35 major companies trading on Bolsa de Madrid

European transaction processor and IT provider for the global travel and tourism industry

CaixaBank, S.A. (), formerly Criteria CaixaCorp, is a Spanish multinational financial services company. CaixaBank is based in Valencia, with operations offices in Barcelona and Madrid. It is Spain's third-largest lender by market value, after Banco Santander and BBVA. CaixaBank has 5,397 branches to serve its 15.8 million customers, and has the most extensive branch network in the Spanish market. It is listed in the Bolsa de Madrid and is part of the IBEX 35.

Spanish banking group

'Naturgy Energy Group S.A., formerly Gas Natural Fenosa''''' (), is a Spanish multinational natural gas and electrical energy utilities company, which operates primarily in Spain. The company's administrative headquarters are in Barcelona, while its legal headquarters are in Madrid.

Acciona, S.A. () is a Spanish multinational conglomerate dedicated to the development and management of infrastructure (construction, water, industrial and services) and renewable energy. The company, via subsidiary Acciona Energía, produces 21 terawatt-hours of renewable electricity a year.

Endesa, S.A. (, originally an initialism for Empresa Nacional de Electricidad, S.A.) is a Spanish multinational electric utility company, the largest in the country. The firm, a majority-owned subsidiary of the Italian utility company Enel, has 10 million customers in Spain, with domestic annual generation of over 97,600 GWh from nuclear, fossil-fueled, hydroelectric, and renewable resource power plants. Internationally, it serves another 10 million customers and provides over 80,100 GWh annually. Total customers numbered 22.2 million as of December 31, 2004. It also markets energy in Europe.

Ferrovial S.E. (), previously Grupo Ferrovial, is a Spanish multinational company that operates in the infrastructure sector for transportation and mobility with four divisions: Highways, Airports, Construction, and Mobility and Energy Infrastructure. The Highway sector develops, finances, and operates tolls on highways such as the 407 ETR, the North Tarrant Express, the LBJ Express, Euroscut Azores, I-66, I-77, NTE35W, and Ausol I. The Construction business designs and builds public and private works such as roads, highways, airports, and buildings. The Mobility and Energy Infrastructure Depa

Spanish defense and information tech company

company

SACYR S.A. () is a Spanish infrastructure operator and developer company based in Madrid.

thumb|250px|The Bankinter building in Seville, designed by architect Aníbal González Álvarez-Ossorio|Aníbal González (1907-1909). Bankinter, S.A. (), is a Spanish financial services company headquartered in Madrid. It has been listed on the since 1972, and is part of the Ibex35 Index. It was founded in 1965 as an industrial bank through a joint venture between Banco Santander and Bank of America.

Enagás, S.A. (, originally an initialism for ) is a Spanish energy company and European transmission system operator (TSO), which owns and operates the nation's gas grid. The firm also owns four liquefied natural gas regasification terminals in the country, at Huelva, Barcelona, Cartagena, and Gijón. In addition, it owns 50% of the plant BBG (Bilbao) and 72.5% of the Saggas terminal in Sagunto. The chairman of Enagás is Antonio Llardén Carratalá and his chief executive officer is Arturo Gonzalo Aizpiri.

alt=Grifols headquarters in Sant Cugat del Vallès (Barcelona)|thumb|Grifols headquarters in Sant Cugat del Vallès (Barcelona) Grifols, S.A. () is a global healthcare company and leading producer of plasma-derived medicines founded in Barcelona, Catalonia, Spain, in 1909. With a workforce of over 23,800 employees, Grifols serves more than 110 countries and regions and maintains a direct presence in over than 30.

Spanish electricity transmission system operator

Mapfre, S.A. (, officially typeset MAPFRE) is a Spanish multinational insurance company, based in Majadahonda, Madrid. The name comes from the old mutual origin of the company (Mutualidad de la Agrupación de Propietarios de Fincas Rústicas de España), but the company now only refers to itself as Mapfre. It is the leading insurance company in Spain and the largest non-life insurance company in Latin America.

Cellnex Telecom is a Spanish wireless telecommunications infrastructure and services company with up to 135,000 sites -including forecast roll-outs up to 2030- throughout Europe. Its activity is divided into four main areas: services for telecommunications infrastructures; audiovisual broadcasting networks; security and emergency network services; and solutions for the intelligent management of urban infrastructures and services (smart cities and Internet of things).

Acerinox, S.A. (), headquartered in Madrid, is a manufacturer of steel and related products. In 2022, it was the 4th largest producer of stainless steel worldwide. It has operations in Europe, Asia, the U.S., and South Africa. It has fifteen factories including five in its stainless steel division. The company has been focused on increasing production in the U.S.

Spanish hotel company

Enaire or AENA is the air navigation manager in Spain, certified for the provision of enroute, approach and aerodrome control services. As a public corporate entity attached to the Spanish Ministry of Public Works, it is responsible for air traffic control, aeronautical information and the communication, navigation and surveillance networks so air companies and their aircraft can fly safely and in an organised format within Spanish airspace.

Unicaja Banco, S.A. (trade name: Unicaja) is a Spanish bank based in Málaga. It was created by the savings bank Unicaja in 2011, to develop its financial activity, being initially the shareholder of 100% of the bank.

Fluidra is a Spanish pool manufacturer currently part of the IBEX 35, the benchmark index of the Bolsa de Madrid, Spain's largest stock exchange.

Spanish company developing renewable energy projects

Spanish Pharmaceutical Company

Spanish real estate company

Compañía de Distribución Integral Logista Holdings, S.A., or Grupo Logista is a Spanish company, through its subsidiaries, operates as a distributor of products and services to proximity retailers in Southern Europe. The company distribution includes different product categories such as tobacco, convenience, pharmaceutical, books and periodicals, as well as e-transactions among others. Logista also provides long distance and full load transport services, temperature-controlled transportation services, industrial parcel and parcel and express courier services.