These Madrid-based companies are predominantly large corporate groups, many with a long history and a global presence. They operate across diverse sectors, including environmental services, utilities, and security. Noteworthy examples include FCC, a global citizen services company with over a century of experience, and Prosegur, a worldwide leader in private security.
The data shows a strong presence of companies in environmental services, such as FCC, Grupo Tragsa, and Urbaser. Another significant cluster is in utilities and infrastructure, represented by Grupo Cobra, Elecnor Group, and Endesa, all established before 1960. Many of these companies were founded in the mid-20th century, indicating a period of significant industrial growth.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 71,000 | ||||
| 2 |
Prosegurprosegur.com
A global leader in private security, offering advanced solutions through five business lines with a strong focus on social responsibility |
67,392 | |||
| 3 |
Grupo Cobragrupocobra.com
Global industrial engineering, installation, and maintenance for infrastructure, specializing in energy, networks, specialized installations, integrated projects, and concession assets. |
5,408 | |||
| 4 |
Grupo EULENeulen.com
Provides specialized outsourced services globally, including facility management, cleaning, security, maintenance, environmental, healthcare, and HR solutions for businesses and public administrations. |
20,585 | |||
| 5 |
Grupo Tragsatragsa.es
Provides engineering, technical assistance, and execution of projects for public administrations in agriculture, environment, and rural development sectors. |
12,239 | |||
| 6 |
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 | |||
| 7 |
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 | |||
| 8 |
ILUNIONilunion.com
A group of companies focused on creating a more accessible world, reinventing themselves daily to compete and move forward |
8,198 | |||
| 9 |
Insud Pharmainsudpharma.com
Specialized pharmaceutical company with global presence, offering APIs, finished dosage forms, branded medicines, and biotech solutions for human and animal health. |
7,035 | |||
| 10 |
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 | |||
| 11 |
Marktel Global Services SAmarktel.es
A group specializing in BPO, Contact Center, and Technology Outsourcing services, providing global solutions with high levels of specialization |
4,000 | |||
| 12 |
Vithas
Operates 22 hospitals and 39 medical centers across Spain, providing accredited, high-quality healthcare services to over five million patients annually. |
3,710 | |||
| 13 |
santalucía segurossantalucia.es
Providing insurance and related services through multiple companies, focusing on customer care, innovation, and employee well-being across Spain. |
3,582 | |||
| 14 |
Abaiabaigroup.com
A Spanish company specializing in customer relationship management through process outsourcing and digital transformation, using innovative technology solutions and AI |
2,805 | |||
| 15 |
Pascualcalidadpascual.com
Spanish family-owned company offering a wide range of innovative, high-quality food and beverage products focused on health and nutrition. |
2,200 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
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 | |||
| 17 |
EZENTISezentis.com
A global industrial services group with 60 years of experience, specializing in operation and maintenance of infrastructure for energy and telecommunications companies in Latin America and Spain |
1,812 | |||
| 18 |
NWorld Advisory, Tech & Operationsn.world
A group of specialized companies offering services in various stages of the value chain: Nfq, Nter, and Nforce |
1,701 | |||
| 19 |
GNgrupo-norte.es
A leading Spanish corporate group offering facility, HR, security, outsourcing, social, educational services, insurance brokerage, and employment for disabled individuals Expanding internationally in Chile and Peru |
1,577 | |||
| 20 |
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 | |||
| 21 |
Sermicrogruposermicro.com
ICT solutions and services integrator of reference with 35+ years of experience, offering innovative technology solutions for businesses worldwide Providing opportunities for professional growth |
1,239 | |||
| 22 | 1,239 | ||||
| 23 | 1,219 | ||||
| 24 |
Albia Servicios Funerariosalbia.es
A national group specializing in organizing and managing personalized funeral services, operating over 250 centers including funeral homes, crematoriums, floristry businesses, and a marble factory |
1,200 | |||
| 25 |
JUNGLEwejungle.com
An ecosystem of creative companies specializing in transforming businesses using creativity across strategy, design, advertising, digital production, and more |
1,116 | |||
| 26 |
ATRESMEDIAatresmedia.com
ATRESMEDIA is a leading communication group in Spain, operating in television, digital development, radio, cinema, internet, events organization, and corporate social responsibility campaigns |
1,109 | |||
| 27 |
GRUPO LANTEROgrupolantero.com
A Spanish multinational specializing in packaging and graphic arts, with divisions for rigid plastic sheets, flexible packaging, folding carton boxes, and book graphics |
1,078 | |||
| 28 |
PagoNxt (a Santander company)pagonxt.com
A leading payment solution provider with a global presence, offering fast solutions to merchants, corporates, and SMEs through innovative fintech services |
942 | |||
| 29 |
MADISON MKmadisonmk.com
MADISON MK provides commercial and marketing services to enhance customer loyalty, increase interactions, and drive profitability through innovative strategies and actions |
870 | |||
| 30 |
Ence - Energía y Celulosaence.es
Leading European eucalyptus cellulose producer and Spain's top renewable energy generator using agroforestry biomass with responsible forest management. |
811 | |||
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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 Nov 11, 2026.
More company lists in Madrid
- The largest companies in Madrid 2,650
- Multinational companies in Madrid 815
- Retail chains in Madrid 259
- Financial services firms in Madrid 231
- Professional services firms in Madrid 227
- Wellness and Fitness Services companies in Madrid 202
- Critical infrastructure operators in Madrid 169
- Healthcare providers in Madrid 161
- Companies with in-house R&D in Madrid 158
- Companies with a mobile app in Madrid 158
- Consulting firms in Madrid 157
- IT services companies in Madrid 155
- Education providers in Madrid 141
- IT Services and IT Consulting companies in Madrid 138
- Software Development companies in Madrid 129
- Financial Services companies in Madrid 125
- Insurance companies in Madrid 122
- SaaS companies in Madrid 113
- Hotel and hospitality groups in Madrid 104
- Manufacturers in Madrid 91
- Public sector organisations in Madrid 90
- Retail Apparel and Fashion companies in Madrid 89
- Business Consulting and Services companies in Madrid 80
- Marketing and communications agencies in Madrid 79
The same list elsewhere in Spain
- Corporate groups and holding companies in Spain 380
- Corporate groups and holding companies in Community of Madrid 123
- Corporate groups and holding companies in Catalonia 79
- Corporate groups and holding companies in Andalusia 34
- Corporate groups and holding companies in Valencian Community 28
- Corporate groups and holding companies in Barcelona 38