| # | Company | Employees |
|---|---|---|
| 1 |
Telefónicatelefonica.com
Leading global telecommunications company providing advanced infrastructure, innovative digital and data services, focusing on secure, cutting-edge technology and social impact. |
121,569 |
| 2 | 71,000 | |
| 3 |
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 |
50,000 |
| 4 |
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 |
36,000 |
| 5 |
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 |
33,828 |
| 6 |
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 |
26,030 |
| 7 |
PreZero Españaprezero.es
The company provides environmentally friendly solutions for waste management and circular economy, serving over 980 municipalities in Spain and Portugal |
14,600 |
| 8 |
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 |
13,939 |
| 9 |
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. |
11,107 |
| 10 |
Elecnor Groupgrupoelecnor.com
Global corporation specializing in engineering, construction, sustainable projects, infrastructure investments, renewable energy, asset management, and energy transmission across 50 countries. |
10,383 |
| 11 |
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 |
10,198 |
| 12 |
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. |
9,800 |
| 13 | 8,854 | |
| 14 | 8,100 | |
| 15 |
Moevemoeveglobal.com
Production of sustainable energies based on green molecules like green hydrogen and 2G biofuels, plus ultrafast electric mobility solutions. |
7,527 |
| 16 |
Bankinterbankinter.com
A leading Spanish online banking brand focused on quality customer service and innovation, offering a wide range of financial products and services |
6,427 |
| 17 | 6,038 | |
| 18 | 5,553 | |
| 19 | 5,374 | |
| 20 | 4,792 | |
| 21 |
Naturgynaturgy.com
A multinational energy company with a 180-year history, focusing on renewables, renewable gas, energy efficiency, and circular economy to create value |
4,696 |
| 22 |
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 |
4,472 |
| 23 |
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 |
4,079 |
| 24 |
HM Hospitaleshmhospitales.com
Private healthcare group with 54 centers offering specialized hospitals, clinics, and integrated care focused on quality, innovation, and patient wellbeing. |
3,803 |
| 25 |
Bankiacaixabank.com
Leading Spanish financial institution in retail, business, corporate finance, capital markets, asset management, and private banking across six autonomous communities. |
3,778 |
| 26 |
Vithas
Operates 22 hospitals and 39 medical centers across Spain, providing accredited, high-quality healthcare services to over five million patients annually. |
3,710 |
| 27 |
santalucía segurossantalucia.es
Providing insurance and related services through multiple companies, focusing on customer care, innovation, and employee well-being across Spain. |
3,582 |
| 28 |
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 |
3,457 |
| 29 | 3,263 | |
| 30 |
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 |
3,225 |
| 31 |
Hospital Gregorio Marañónhggm.es
A public hospital in Madrid known for highly trained professionals, teaching and research, technological advancements, and national/international specialty care |
3,146 |
| 32 |
Fundación Hospitalariasfundacionhospitalarias.org
Non-profit institution providing specialized care, assistance, and social reintegration for individuals with mental illness, intellectual disabilities, and other conditions worldwide |
3,112 |
| 33 |
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 |
2,963 |
| 34 |
Banco de Españabde.es
National central bank and banking supervisor, managing monetary policy, currency issuance, payment systems, and financial system stability in Spain. |
2,585 |
| 35 |
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 |
2,560 |
| 36 |
Santander Españabancosantander.es
Providing innovative banking products and solutions, building lasting customer relationships, supporting personal and business project development with expertise and resources. |
2,386 |
| 37 |
Aqualiaaqualia.com
Aqualia provides water management services to municipalities and private entities in 18 countries, serving 452 million people with sustainable solutions |
2,316 |
| 38 |
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 |
2,302 |
| 39 | 2,232 | |
| 40 |
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 |
2,229 |
| 41 |
FCC Medio Ambientefccma.com
A global leader in environmental services, offering waste collection, recycling, energy recovery, cleaning, maintenance, and industrial waste treatment solutions worldwide |
2,061 |
| 42 |
Allianz Españaallianz.es
Providing life and non-life insurance products, investment solutions, and client services through agents, brokers, and banking networks in Spain. |
1,952 |
| 43 |
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 |
1,875 |
| 44 | 1,768 | |
| 45 |
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. |
1,767 |
| 46 |
Exolumexolum.com
A European leader in liquid product logistics, specializing in innovative solutions for biofuels, hydrogen, and circular economy to shape the future |
1,650 |
| 47 |
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 |
1,593 |
| 48 |
Hospital Universitario Ramón y Cajal
A medical practice company located in Madrid, Spain, specializing in providing healthcare services at Hospital Universitario Ramón y Cajal |
1,548 |
| 49 |
ING España&Portugaling.es
ING Spain & Portugal is a digital bank focusing on simplicity, transparency, innovation, and sustainability to make banking easier for 4 million customers |
1,509 |
| 50 |
Canal de Isabel IIcanaldeisabelsegunda.es
A public company in Madrid managing the water cycle, ensuring supply and quality, while contributing to environmental protection and using advanced technology |
1,475 |
| 51 |
EDP Renewablesedpr.com
Global renewable energy company specializing in wind power generation with extensive international presence and significant operating capacity. |
1,449 |
| 52 |
Openbankopenbank.us
Online bank offering complete, convenient, and fast banking services through phone and internet Accessible anytime via smartphone or tablet, with free debit card and access to Santander ATMs |
1,422 |
| 53 |
UFINETufinet.com
A Latin American carrier of carriers providing high-quality telecom solutions with a carrier-grade network, customer-oriented services, and a wide service portfolio |
1,394 |
| 54 | 1,363 | |
| 55 |
Eurofins Españaeurofins-megalab.com
Leader in clinical diagnostic testing in Spain with over 35 years of experience Offers over 5,000 different tests, serving 70+ hospitals nationwide |
1,313 |
| 56 |
Sanitas Hospitalessanitas.es
A Madrid-based insurance company providing hospital services, located at CALLE RIBERA DEL LOIRA 52, MADRID, Spain |
1,309 |
| 57 |
Ontime Logística Integralontime.es
Comprehensive logistics services including parcel, pallet, full loads, dedicated transport, industrial, pharma, sustainable urban delivery, and multimodal transport across Iberia. |
1,306 |
| 58 |
EMT Madridemtmadrid.es
Management of urban bus, public parking, vehicle removal, public bike service BiciMAD, and Madrid cable car operations. |
1,259 |
| 59 | 1,239 | |
| 60 |
LogiRAILlogirail.com
LogiRAIL provides global logistics, technology, and handling services for the railway sector in Spain They prioritize agility, efficiency, safety, and customer value |
1,215 |
| 61 |
Hospital Universitario San Rafaelhospitalsanrafael.es
The Hospital Universitario San Rafael provides specialized medical and surgical care to patients, focusing on holistic treatment and education in healthcare sciences |
1,004 |
| 62 |
San Juan de Dios Españasjd.es
Official account of a healthcare organization in Spain dedicated to promoting health and providing care to the vulnerable through a network of facilities and professionals |
987 |
| 63 |
South Europe Ground Services
Provides ground and passenger assistance services to IAG Group airlines and third-party companies at 38 airports in Spain. |
976 |
| 64 |
BBVA Asset Management en Españabbvaassetmanagement.com
A global asset management unit specializing in investment funds and pension management, known for innovation, excellence, and regional expertise |
953 |
| 65 |
CASER RESIDENCIALcaseresidencial.es
A private sociosanitary services provider specializing in elderly care, offering residential centers, day centers, assisted living, home care, and telecare nationwide |
934 |
| 66 |
VidaCaixavidacaixa.es
A leading enterprise in the social welfare sector, prioritizing Quality, Trust, and Social Commitment for customers, employees, shareholders, society, and the environment |
884 |
| 67 | 868 | |
| 68 | 861 | |
| 69 |
Pelayo Mutua de Segurospelayo.com
A fixed premium insurance mutual company in Spain offering a wide range of insurance products with a strong financial position and commitment to social programs |
838 |
| 70 |
Avatel Telecomavatel.es
A leading Spanish telecommunications provider offering fiber optic, fixed and mobile telephony, and television services Driving technological development and connectivity nationwide |
819 |
| 71 |
EDP Españaedpenergia.es
Global company leading the energy transition with a goal to be 100% green by 2030 Produces over 75% renewable energy and supports a sustainable future |
805 |
| 72 |
Liberbankunicajabanco.es
We have merged with Unicaja Banco Stay up to date with news from the entity by following us @UnicajaBanco |
794 |
| 73 |
Redsys Servicios de Procesamientoredsys.es
Specializing in digital payment solutions with expertise in EMV, contactless, tokenization, wallets, e-commerce, cybersecurity, certification, chargebacks, healthcare, telemedicine, mobility, and transportation services |
789 |
| 74 |
Vodafone Españavodafone.es
The company believes in using technology and connectivity to improve lives and create a more sustainable society, aiming to impact one billion lives positively by 2025 |
780 |
| 75 |
Grupo Hospitalario HLAgrupohla.com
A leading hospital group in Spain providing high-quality healthcare through a network of 18 hospitals and 38 multidisciplinary medical centers |
779 |
| 76 |
Babcock Españababcockinternational.com
Leader in emergency air services & aircraft maintenance Specializing in medical emergencies, civil protection, search & rescue, firefighting, and training Operating worldwide with 400 aircraft fleet |
753 |
| 77 | 730 | |
| 78 |
Telefónica Españajobs.telefonica.com
A tech-driven organization in Spain focusing on trust, sustainability, and team well-being, connecting talent through innovative work models #ConnectingTalent |
715 |
| 79 |
Solunionsolunion.com
A team of professionals with extensive experience in credit and surety insurance, providing solutions to drive secure business growth and projects |
713 |
| 80 |
Grenergygrenergy.eu
A project developer and Independent Power Producer specializing in solar and wind energy plants' development, construction, operation, maintenance, and sale |
713 |
| 81 |
Cecabankcecabank.es
Wholesale Spanish bank specializing in securities services, payments, treasury management, and digital solutions, offering tailored financial proposals to help customers achieve business objectives internationally |
685 |
| 82 | 675 | |
| 83 |
X-ELIOx-elio.com
Develops renewable energy projects, driving businesses and communities toward a sustainable future, with a global, responsible business model for the planet and inhabitants. |
672 |
| 84 |
BME | Bolsas y Mercados Españolesbolsasymercados.es
A company managing financial markets infrastructures in Spain, owned by Grupo SIX, offering global trading services, secure financial information, and payment solutions worldwide |
665 |
| 85 |
ENGIE Españaengie.es
Production of renewable energy, energy management, and industrial solutions supporting clients' transition to carbon neutrality and energy efficiency. |
659 |
| 86 | 658 | |
| 87 |
OW Ocean Windsoceanwinds.com
development, financing, construction, and operation of offshore wind farms delivering reliable, green energy to homes and businesses worldwide |
646 |
| 88 |
Iberia Expressiberiaexpress.com
Operating a punctual, efficient low-cost airline with a hybrid business model, offering connecting flights, business class, and sustainability commitments. |
645 |
| 89 |
Clínica Nuestra Señora de la Pazxn--nuestraseoradelapaz-33b.es
A non-profit mental health center in Madrid, Spain, providing patient-centered care and utilizing the latest scientific advancements to serve patients nationwide |
610 |
| 90 |
Gerencia Asistencial de Atención Primariacomunidad.madrid
A public organization providing healthcare services in the Community of Madrid, focusing on improving health, promoting wellness, and efficient resource management 13,209 professionals involved |
571 |
| 91 | 567 | |
| 92 |
Crédito y Caucióncreditoycaucion.es
Since 1929, this company offers credit insurance to protect businesses from non-payment risks, with a global presence for international trade coverage |
555 |
| 93 |
DHL Express Españadhl.com
Global leader in logistics and transportation, offering a wide range of services including international delivery, e-commerce solutions, express shipping, and supply chain management |
549 |
| 94 |
Plus Ultra Líneas Aéreasplusultra.com
Airline offering high-quality transatlantic flights between Spain and Latin America with modern aircraft, daily frequencies, and competitive pricing. |
527 |
| 95 |
UCI, Unión de Créditos Inmobiliariosuci.com
Providing sustainable loans and mortgages focused on responsible home buying, community rehabilitation, and contributing to urban decarbonization goals. |
515 |
| 96 |
Abertisabertis.com
Management of over 8,000 kilometers of high-capacity toll roads across 15 countries, focusing on safety, technology, and innovation. |
472 |
| 97 |
GS Inima Environmentinima.com
A global leader in the water sector, specializing in all project phases from design to maintenance, with over 200 completed projects worldwide |
461 |
| 98 |
BANCO COOPERATIVO ESPAÑOLbancocooperativo.es
Provides banking services to rural cooperative banks, emphasizing employee commitment, customer excellence, and strong organizational values. |
441 |
| 99 |
Hospital Universitario Nuestra Señora del Rosariohospitalrosario.es
A surgical medical center in Madrid, offering a wide range of specialties, advanced technology, and 24-hour emergency services for adults and neonates |
434 |
| 100 |
Banco Inversisinversis.es
Specialized in high value-added solutions for financial institutions, offering a range of services including trading, settlement, custody, operational procurement, and technology solutions |
422 |
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How this list is built
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.
More company lists in Madrid
- The largest companies in Madrid 2,387
- Retail chains in Madrid 226
- Financial services firms in Madrid 211
- Wellness and Fitness Services companies in Madrid 186
- Healthcare providers in Madrid 128
- IT Services and IT Consulting companies in Madrid 122
- Financial Services companies in Madrid 117
- Software Development companies in Madrid 109
- IT services companies in Madrid 109
- Insurance companies in Madrid 104
- SaaS companies in Madrid 96
- Retail Apparel and Fashion companies in Madrid 78
- Education providers in Madrid 69
- Business Consulting and Services companies in Madrid 69
- Advertising Services companies in Madrid 68
- Public sector organisations in Madrid 66
- Entertainment Providers companies in Madrid 62
- Consulting firms in Madrid 57
- Venture capital and private equity firms in Madrid 53
- Energy companies in Madrid 50
- Hospitality companies in Madrid 50
- Investment Management companies in Madrid 50
- Government Administration companies in Madrid 48
- Manufacturers in Madrid 48
The same list elsewhere in Spain
- Critical infrastructure operators in Spain 426
- Critical infrastructure operators in Community of Madrid 169
- Critical infrastructure operators in Catalonia 91
- Critical infrastructure operators in Andalusia 34
- Critical infrastructure operators in Valencian Community 31
- Critical infrastructure operators in Barcelona 50