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100 leading critical infrastructure operators in Spain

Tamtam tracks 426 critical infrastructure operators headquartered in Spain. This list ranks the 100 largest by number of employees on LinkedIn, led by BBVA, Santander and Telefónica. Their median headcount is 3,457. Half of them were founded in 1957 or later. The most common headquarters are Madrid (47), Barcelona (13) and Bilbao (3).

🇪🇸 Spain100 companiesUpdated Oct 24, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
BBVAbbva.com

Global banking company driving digital transformation to provide cutting edge solutions to 85 million customers worldwide through collaborative and innovative work culture

Banking 🇪🇸 Bilbao 130,572 1857
2
Santandersantander.com

Leading global bank offering retail, corporate, investment banking, wealth management, insurance, and payment services to diverse clients worldwide.

Banking 🇪🇸 Boadilla del Monte 129,701 n/a
3
Telefónicatelefonica.com

Leading global telecommunications company providing advanced infrastructure, innovative digital and data services, focusing on secure, cutting-edge technology and social impact.

Telecommunications 🇪🇸 Madrid 121,569 n/a
4
FCCfcc.es

Global citizen services company with 100+ years of experience in environmental services, water, and infrastructure sectors, operating in 34 countries

Environmental Services 🇪🇸 Madrid 71,000 1900
5
Quirónsaludquironsalud.com

Leader in healthcare in Spain and Europe with over 50,000 professionals and 59 hospitals, focusing on medical research, education, and cutting-edge technology

Wellness and Fitness Services 🇪🇸 Madrid 50,000 1893
6
Iberdrolaiberdrola.com

A global leader in renewable energy and electricity, focusing on sustainable and efficient services for millions worldwide with investments in clean energy and digital transformation

Electric Power Generation 🇪🇸 Bilbao 45,000 1901
7
Mapfremapfre.com

Provides insurance, financial, and service solutions globally, focusing on innovation, trust, inclusion, and sustainability for individuals and businesses for over 90 years.

Insurance 🇪🇸 Majadahonda 39,064 1933
8
Grupo Cobragrupocobra.com

Global company with 80 years of experience in industrial engineering and specialized services, present in over 45 countries, focusing on renewable energy and various engineering sectors

Utilities 🇪🇸 Madrid 36,000 1944
9
ACCIONAacciona.com

The company specializes in developing regenerative infrastructure with a focus on sustainability, leading the transition to a low-carbon economy with a positive impact on people and the planet

Utilities 🇪🇸 Madrid 33,828 n/a
10
repsolrepsol.com

A leading player in the oil and gas industry, involved in exploration, production, transformation, development, and marketing of efficient, sustainable energy solutions globally

Oil and Gas 🇪🇸 Madrid 26,030 n/a
11
CaixaBankcaixabank.es

A leading financial group in Spain offering banking, insurance, and investment services with a focus on quality, innovation, and sustainable economic growth

Banking 🇪🇸 Valencia 21,535 n/a
12
PreZero Españaprezero.es

The company provides environmentally friendly solutions for waste management and circular economy, serving over 980 municipalities in Spain and Portugal

Environmental Services 🇪🇸 Madrid 14,600 2021
13
Correoscorreos.es

The company is a leader in physical, digital, and parcel communications, offering quality services in the ecommerce value chain, reaching millions of homes and businesses annually

Utilities 🇪🇸 Madrid 13,939 1716
14
Banco Sabadellsabadellcareers.com

Comprehensive financial services group offering personal and business banking with modern technology, professional staff, and a customer-focused multibrand approach.

Banking 🇪🇸 Sabadell 11,430 n/a
15
Iberiaiberia.com

Spain's number-one airline group and Europe-Latin America market leader. Part of IAG Group and Oneworld Alliance, offers best connections to 700 destinations worldwide.

Airlines and Aviation 🇪🇸 Madrid 11,107 1927
16
Elecnor Groupgrupoelecnor.com

Global corporation specializing in engineering, construction, sustainable projects, infrastructure investments, renewable energy, asset management, and energy transmission across 50 countries.

Construction 🇪🇸 Madrid 10,383 1958
17
Sanitascorporativo.sanitas.es

The company is dedicated to promoting healthier and happier lives through an integrated healthcare model, including insurance, hospitals, rehabilitation centers, and dental clinics

Wellness and Fitness Services 🇪🇸 Madrid 10,198 n/a
18
Endesaendesa.com

Leaders in electricity and natural gas sector. Providing services to millions of clients. Core business is production, transportation, distribution and commercialization of electric power.

Utilities 🇪🇸 Madrid 9,800 1944
19
DIGI SPAIN TELECOMdigimobil.es

A mobile virtual operator in Spain, offering affordable rates for calls, internet, and roaming Backed by a strong network and customer support in multiple languages

Telecommunications 🇪🇸 Alcobendas 9,000 2006
20
osakidetzaosakidetza.euskadi.eus

The company focuses on maintaining a consistent corporate identity through a new Corporate Identity Manual, ensuring uniformity across its affiliated organizations

Wellness and Fitness Services 🇪🇸 Vitoria-Gasteiz 8,951 1983
21
SACYRsacyr.com

A global group specializing in infrastructure, services, and industrial projects with a focus on sustainability, profitability, and improving daily lives

Civil Engineering 🇪🇸 Madrid 8,854 n/a
22
SEURseur.com

Leading urgent transport provider in Spain, specializing in international deliveries, ecommerce, and temperature-controlled shipments Committed to sustainability and innovation for a better planet

Truck Transportation 🇪🇸 Madrid 8,100 1942
23
Institut Català de la Salutics.gencat.cat

The company provides healthcare services from pregnancy to old age, with a wide territorial coverage and a strong emphasis on education, research, and innovation

Hospitals and Health Care 🇪🇸 Barcelona 7,936 n/a
24
Moevemoeveglobal.com

Production of sustainable energies based on green molecules like green hydrogen and 2G biofuels, plus ultrafast electric mobility solutions.

Oil and Gas 🇪🇸 Madrid 7,527 n/a
25
Bankinterbankinter.com

A leading Spanish online banking brand focused on quality customer service and innovation, offering a wide range of financial products and services

Banking 🇪🇸 Madrid 6,427 1965
26
Hospital Clínic de Barcelonaclinicbarcelona.org

A leading public university hospital in Spain, offering quality healthcare, cutting-edge research, and professional training with a focus on humanized medicine

Hospitals and Health Care 🇪🇸 Barcelona 6,159 1906
27
ADIFadif.es

Adif is a public entity that manages and develops railway infrastructure in Spain to promote safe, efficient, and sustainable rail transport

Rail Transportation 🇪🇸 Madrid 6,038 2005
28
CEPSAcepsa.com

A leading international entity specializing in sustainable mobility and energy, with expertise in chemicals and a focus on reducing carbon emissions

Oil and Gas 🇪🇸 Madrid 5,553 n/a
29
Aenaaena.es

A leading airport operator offering efficient, quality services in 46 airports in Spain and 16 internationally, prioritizing customer experience and sustainability

Airlines and Aviation 🇪🇸 Madrid 5,374 1991
30
Ocasoocaso.es

An independent Spanish insurance company founded in 1920, focusing on tradition, commitment, and customer satisfaction through efficient service and long-term employee development

Insurance 🇪🇸 Madrid 4,792 1920
31
Volarisvolaris.com

ultra-low-cost carrier providing point-to-point flights across Mexico, the United States, and Central America, offering low fares and extensive customer choice

Airlines and Aviation 🇪🇸 Mexico City 4,771 2006
32
Naturgynaturgy.com

A multinational energy company with a 180-year history, focusing on renewables, renewable gas, energy efficiency, and circular economy to create value

Electric Power Generation 🇪🇸 Madrid 4,696 1843
33
Urbaserurbaser.com

A global sustainability-focused company providing environmental management services to over 50 million people in 20 countries through a large network of employees and subsidiaries

Environmental Services 🇪🇸 Madrid 4,472 n/a
34
Hospital Universitari Vall d'Hebronvallhebron.com

A leading hospital complex in Catalonia with four large centers offering a wide range of medical and surgical specialties

Hospitals and Health Care 🇪🇸 Barcelona 4,361 1955
35
Coxabengoagrupocox.com

An international company specializing in innovative technology solutions for sustainability in energy, water, and infrastructure sectors with a focus on social responsibility

IT Services and IT Consulting 🇪🇸 Seville 4,132 1941
36
ABANCAabanca.com

A leading financial institution in Spain focused on a new approach to banking, combining traditional values with innovation to meet client needs

Banking 🇪🇸 A Coruña 4,117 2014
37
Vueling Airlinesvueling.com

Low-cost airline operating primarily in Spain and Europe, connecting major cities and islands with a focus on sustainability and growth.

Airlines and Aviation 🇪🇸 Viladecans 4,087 2004
38
Santander Corporate & Investment Bankingsantandercib.com

A global banking division specializing in corporate and investment services, offering tailored products to clients in Europe, Latin America, US, and Asia

Financial Services 🇪🇸 Madrid 4,079 n/a
39
FREMAPfremap.es

We are a collaborator entity managing and protecting work-related risks for companies, providing comprehensive services including prevention, healthcare, training, and social support

Hospitals and Health Care 🇪🇸 Majadahonda 4,000 1933
40
Gas Natural Fenosagasnaturalfenosa.com

Leading multinational company operating in gas and electricity sectors, serving over 20 million customers across 23 countries worldwide.

Oil and Gas 🇪🇸 Barcelona 3,989 n/a
41
CHRISTUS MUGUERZA

A catholic health system providing comprehensive care with love and dignity through hospitals, clinics, ambulances, and nursing schools across multiple countries

Hospitals and Health Care 🇪🇸 San Pedro 3,879 n/a
42
MRWmrw.es

A national urgent transport brand with over 550 offices and 56 logistics platforms delivering 62 million annual shipments, specializing in e-commerce and customer satisfaction

Freight and Package Transportation 🇪🇸 El Prat de Llobregat 3,834 1977
43
HM Hospitaleshmhospitales.com

Private healthcare group with 54 centers offering specialized hospitals, clinics, and integrated care focused on quality, innovation, and patient wellbeing.

Wellness and Fitness Services 🇪🇸 Madrid 3,803 1989
44
Bankiacaixabank.com

Leading Spanish financial institution in retail, business, corporate finance, capital markets, asset management, and private banking across six autonomous communities.

Banking 🇪🇸 Madrid 3,778 2010
45
Barcelona Children's Hospital Sant Joan de Déusjdhospitalbarcelona.org

A teaching hospital specializing in pediatrics, gynecology, and obstetrics in Barcelona, Catalonia Privately owned, affiliated with the Hospitaller Order of St John of God

Hospitals and Health Care 🇪🇸 Esplugues de Llobregat 3,728 1867
46
Vithas

Operates 22 hospitals and 39 medical centers across Spain, providing accredited, high-quality healthcare services to over five million patients annually.

Hospitals and Health Care 🇪🇸 Madrid 3,710 2012
47
Hospital del Marhospitaldelmar.cat

Modern general hospital treating medium and high complexity pathologies, affiliated with a university and emphasizing research, located in a diverse, multicultural area

Hospitals and Health Care 🇪🇸 Barcelona 3,654 1983
48
Unicajaunicajabanco.es

A leading bank in Spain with a strong financial history, serving over three million clients with quality and close financial services in various regions

Banking 🇪🇸 Málaga 3,615 n/a
49
santalucía segurossantalucia.es

Providing insurance and related services through multiple companies, focusing on customer care, innovation, and employee well-being across Spain.

Insurance 🇪🇸 Madrid 3,582 1922
50
CAJAMARgrupocooperativocajamar.es

Leading Spanish credit cooperative with over 14 million members, 39 million clients, 1,200+ branches, and 5,000 employees, part of Spain's largest cooperative credit group

Banking 🇪🇸 Madrid 3,457 1946
51
Ibercajaibercaja.es

A leading Spanish banking group offering high-quality financial services to individuals, institutions, and businesses through over 1,250 branches and online banking

Banking 🇪🇸 Zaragoza 3,278 1876
52
CASERcaser.es

An experienced insurance group offering a wide range of solutions in Home, Auto, Health, and Life insurance, with a strong focus on customer service and professionalism

Insurance 🇪🇸 Madrid 3,263 1942
53
Hospital Universitario La Pazcomunidad.madrid

A public hospital in Madrid that offers specialized healthcare services to patients from Spain and other countries, with a strong reputation in the healthcare industry

Hospitals and Health Care 🇪🇸 Madrid 3,225 1964
54
Hospital Gregorio Marañónhggm.es

A public hospital in Madrid known for highly trained professionals, teaching and research, technological advancements, and national/international specialty care

Medical Practices 🇪🇸 Madrid 3,146 n/a
55
Fundación Hospitalariasfundacionhospitalarias.org

Non-profit institution providing specialized care, assistance, and social reintegration for individuals with mental illness, intellectual disabilities, and other conditions worldwide

Hospitals and Health Care 🇪🇸 Madrid 3,112 1881
56
Servizo Galego de Saúdesergas.gal

Management and leadership of all public health centers and services in Galicia, ensuring comprehensive healthcare under regional government authority.

Wellness and Fitness Services 🇪🇸 Santiago de Compostela 3,056 n/a
57
Transports Metropolitans de Barcelona (TMB)tmb.cat

The company is the main public transport operator in Catalonia, providing bus and metro networks, as well as leisure transport services

Utilities 🇪🇸 Barcelona 3,050 1979
58
Hospitenhospiten.com

An international healthcare network with nearly 50 years of experience, operating private medical centers in multiple countries and serving over 17 million patients annually

Hospitals and Health Care 🇪🇸 Santa Cruz De Tenerife 3,000 1969
59
Air Europaaireuropa.com

Airline operating domestic Spanish routes, European, North African, and transoceanic destinations with a fleet of modern aircraft.

Airlines and Aviation 🇪🇸 Llucmajor 2,969 1986
60
BBVA en Españabbva.es

A multinational financial group offering services to 53 million clients in over 30 countries, prioritizing a better future for people through education and social entrepreneurship

Banking 🇪🇸 Madrid 2,963 n/a
61
Hospital de la Santa Creu i Sant Pausantpau.cat

A centuries-old highly complex hospital in Spain, primarily serving Barcelona and Catalonia, with a prominent national and international reputation

Hospitals and Health Care 🇪🇸 Barcelona 2,826 1401
62
Banco de Españabde.es

National central bank and banking supervisor, managing monetary policy, currency issuance, payment systems, and financial system stability in Spain.

Banking 🇪🇸 Madrid 2,585 1782
63
Banco Popularbancosantander.es

One of the top five banking groups in Spain, focused on retail and commercial banking with a strong customer-centric approach, high credit volume, and international presence

Banking 🇪🇸 Madrid 2,560 1926
64
Cellnex Telecomcellnex.com

The company is a leading provider of wireless telecommunications and broadcasting infrastructure across Europe, with a focus on shared-use services

Telecommunications 🇪🇸 Barcelona 2,542 n/a
65
Servicio Extremeño de Saludsaludextremadura.ses.es

Public health organization in Extremadura, Spain, responsible for providing healthcare services, part of the National Health System, established in 1986

Wellness and Fitness Services 🇪🇸 Mérida 2,454 n/a
66
Santander Españabancosantander.es

Providing innovative banking products and solutions, building lasting customer relationships, supporting personal and business project development with expertise and resources.

Banking 🇪🇸 Madrid 2,386 n/a
67
Kutxabankportal.kutxabank.es

Financial institution operating a local banking model, prioritizing clients, fostering long-term relationships with individuals and SMEs, and reinvesting profits into society.

Banking 🇪🇸 Bilbao 2,360 2012
68
Banco Mediolanumbancomediolanum.es

This company offers personalized financial services through Family Bankers and Multichannel Banking, part of a banking group with millions of clients across Europe

Banking 🇪🇸 Barcelona 2,324 1983
69
Aqualiaaqualia.com

Aqualia provides water management services to municipalities and private entities in 18 countries, serving 452 million people with sustainable solutions

Environmental Services 🇪🇸 Madrid 2,316 n/a
70
Mutua Madrileñamutua.es

A leading insurance company with over 169 million clients, ranking first in various insurance categories and expanding internationally Also active in asset management and real estate

Insurance 🇪🇸 Madrid 2,302 1930
71
Veolia | Españaveolia.es

Leading environmental services provider specialized in decarbonization and circular economy through optimized management of energy water and waste for cities and industries

Environmental Services 🇪🇸 Barcelona 2,272 n/a
72
Alsaalsa.es

With over a century of experience, the company is the leading organization in Spain's road passenger transport sector, offering a wide range of bus services

Ground Passenger Transportation 🇪🇸 Madrid 2,232 1923
73
Hospital Universitari de Bellvitgebellvitgehospital.cat

Tertiary-care teaching facility with 700 beds, offering high complexity medical care to over 2 million people, ranked among the top hospitals in the state

Hospitals and Health Care 🇪🇸 L'Hospitalet de Llobregat 2,231 1972
74
SegurCaixa Adeslassegurcaixaadeslas.es

A leading Spanish non-life insurance company specializing in health insurance and other sectors Known for its extensive network of medical facilities and high-quality service

Insurance 🇪🇸 Madrid 2,229 n/a
75
Hospital La Fe de Valenciahospital-lafe.com

A leading public healthcare center in Spain's Valencia region, offering comprehensive medical services, teaching programs, and research facilities with over 7,000 staff members

Wellness and Fitness Services 🇪🇸 Valencia 2,157 1968
76
Logistalogista.com

A leading logistics operator in Europe specializing in distribution to local channels, serving nearly 200,000 points of sale with a focus on efficiency and customer needs

Transportation, Logistics, Supply Chain and Storage 🇪🇸 Leganés 2,145 1999
77
Grupo Hospital Privadogrupohospitalprivado.com

An integrated health system focused on quality medical care, service management, technology, and prevention for sustainable healthcare

Wellness and Fitness Services 🇪🇸 Córdoba 2,140 n/a
78
ASEPEYOasepeyo.es

Leader in accident & occupational disease insurance with services benefiting society, companies, workers & employees Protecting 2 million workers & 272,000+ companies nationwide

Hospitals and Health Care 🇪🇸 Barcelona 2,119 1915
79
Sanatorio Allende S.A.sanatorioallende.com

A medical facility in Córdoba founded in 1938, providing high-quality healthcare services with specialized staff, modern technology, and infrastructure

Wellness and Fitness Services 🇪🇸 Cordoba 2,098 1938
80
Mutua Universalmutuauniversal.net

Voluntary association providing healthcare and economic benefits to workers, collaborating with Social Security across all autonomous communities.

Hospitals and Health Care 🇪🇸 Barcelona 2,065 1907
81
FCC Medio Ambientefccma.com

A global leader in environmental services, offering waste collection, recycling, energy recovery, cleaning, maintenance, and industrial waste treatment solutions worldwide

Environmental Services 🇪🇸 Madrid 2,061 1911
82
Servicio Aragones de Salud (SALUD)aragon.es

Management and provision of public healthcare services within the Autonomous Community of Aragón, integrated into the National Health System.

Government Administration 🇪🇸 Zaragoza 2,045 1989
83
Hospital Privado Universitario de Córdobahospitalprivado.com.ar

A private university hospital in Córdoba, Argentina, dedicated to providing high-quality medical care, research, and education for over 60 years

Wellness and Fitness Services 🇪🇸 Córdoba 2,041 1957
84
Linea Directa Aseguradoralineadirectaaseguradora.com

Offers direct insurance products including home, vehicle, health, and pet coverage with a focus on digital innovation and customer proximity.

Insurance 🇪🇸 Tres Cantos 1,981 1995
85
Allianz Españaallianz.es

Providing life and non-life insurance products, investment solutions, and client services through agents, brokers, and banking networks in Spain.

Insurance 🇪🇸 Madrid 1,952 n/a
86
Groundforce España - Globalia Handling - Handling Servicesgroundforce.aero

Provider of ground handling services for third parties in Spain, serving over 250 customers, 175k departures, and 120k tons of cargo across 12 airports and 8 warehouses

Airlines and Aviation 🇪🇸 Llucmajor 1,943 1994
87
Voloteavolotea.com

Fast-growing European airline serving medium-sized cities, operating numerous routes and flights while prioritizing sustainable aviation practices and customer satisfaction

Airlines and Aviation 🇪🇸 Barcelona 1,889 2011
88
ACCIONA Energíaacciona-energia.com

Global leader in renewable energy solutions, focused on decarbonizing the economy through sustainable energy practices to combat climate change and promote community well-being

Renewable Energy Power Generation 🇪🇸 Madrid 1,875 n/a
89
LABORAL Kutxalaboralkutxa.com

A financial institution focused on cooperative banking, committed to serving clients democratically, creating jobs, and contributing to societal development for almost 60 years

Banking 🇪🇸 Arrasate - Mondragón 1,824 n/a
90
Parc Taulí Hospital Universitaritauli.cat

This institutional public entity provides healthcare services, education, research, and social activities for citizens, in collaboration with the Autonomous University of Barcelona

Hospitals and Health Care 🇪🇸 Sabadell 1,786 1986
91
Grupo MASMOVILgrupomasmovil.com

An Iberian Telecom operator providing fixed, mobile, broadband Internet services, green energy, telemedicine, security, with a focus on customer satisfaction and sustainability

Telecommunications 🇪🇸 Alcobendas 1,772 2006
92
ENAIREenaire.es

A company under the Ministry of Transport in Spain managing air navigation services at airports and en-route control centers, part of international aviation alliances

Airlines and Aviation 🇪🇸 Madrid 1,768 1990
93
Metro de Madrid, S.A.metromadrid.es

Management and operation of Madrid's extensive metro network, providing high-quality, innovative, and accessible public transportation services daily.

Urban Transit Services 🇪🇸 Madrid 1,767 1919
94
Parc Sanitari Sant Joan de Deupssjd.org

A network of healthcare, educational, and research facilities focused on mental health, social care, intellectual disabilities, and general hospital services

Hospitals and Health Care 🇪🇸 Sant Boi del Llobregat 1,746 2010
95
Umivale Activaumivaleactiva.es

We are a non-profit organization that manages and protects workplace accident and occupational disease risks for associated companies, aiming to optimize their occupational health

Hospitals and Health Care 🇪🇸 Quart de Poblet 1,700 2006
96
Exolumexolum.com

A European leader in liquid product logistics, specializing in innovative solutions for biofuels, hydrogen, and circular economy to shape the future

Transportation, Logistics, Supply Chain and Storage 🇪🇸 Madrid 1,650 1927
97
Primafrioprimafrio.com

With over 60 years of experience, this international logistics operator specializes in transporting perishable goods and pharmaceuticals, focusing on sustainability and innovation

Transportation, Logistics, Supply Chain and Storage 🇪🇸 Alhama de Murcia 1,648 2007
98
ATENCION PRIMARIA SACYL

A Hospital and Health Care company in Segovia, Spain focused on providing primary care services within the Castile and León region

Hospitals and Health Care 🇪🇸 Segovia 1,614 n/a
99
Avanzaavanzagrupo.com

Leading operator in urban and intercity public transport services in Spain Focus on sustainable mobility solutions and expansion through acquisitions and public contracts

Ground Passenger Transportation 🇪🇸 Madrid 1,593 1885
100
Hospital de la Santa Creu i Sant Pausantpau.cat

A level 3 university hospital with over 600 years of history, offering all medical and surgical specialties to a community of 450,000 residents

Hospitals and Health Care 🇪🇸 1,558 1401

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Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Oct 24, 2026.

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