The publicly traded companies in Madrid are large, established firms across diverse sectors, including telecommunications, energy, and security. Telefónica is a global telecommunications company, while Prosegur specializes in private security. Repsol is a major player in oil and gas, and Amadeus revolutionizes the travel industry with IT services.
Most of these companies are headquartered in Madrid, underscoring the city's role as a major business hub. The founding dates provided, such as Naturgy (1843), Elecnor Group (1958), and Tecnicas Reunidas (1960), indicate a strong presence of companies with long operational histories.
| # | 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 |
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 |
Indra Groupindragroup.com
Leading multinational providing defense, space, air traffic management, and mobility solutions alongside information technology services, artificial intelligence, cybersecurity, and advanced digital transformation projects. |
39,308 | |||
| 4 |
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 | |||
| 5 |
Amadeusamadeus.com
A company revolutionizing the travel industry by inspiring innovation, partnerships, and responsibility, connecting the travel ecosystem and promoting social and environmental good |
23,625 | |||
| 6 |
Gestampgestamp.com
A multinational company specializing in designing and manufacturing advanced metal components for vehicle manufacturers worldwide, focusing on lighter, safer, and more environmentally friendly products |
17,667 | |||
| 7 |
Tecnicas Reunidastecnicasreunidas.es
An international general contractor specializing in engineering and construction of industrial facilities in oil & gas, refining, power generation, infrastructures, and energy transition |
12,368 | |||
| 8 |
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 | |||
| 9 |
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 | |||
| 10 |
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 | |||
| 11 |
Accenture Españaaccenture.com
A global professional services company helping businesses and governments with digital transformation, cloud technology, data analytics, and industry expertise to drive tangible outcomes |
6,208 | |||
| 12 | 5,374 | ||||
| 13 |
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 | |||
| 14 |
OHLA Groupohla-group.com
A global leader in construction, engineering, and development projects, focusing on transport infrastructure, unique buildings, and sustainable progress in various regions worldwide |
4,270 | |||
| 15 |
OVB Allfinanz Españaovb.es
A leading financial advisory group in Europe, providing independent and personalized advice to clients across 14 countries based on life phases and long-term goals |
3,022 | |||
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 |
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 | |||
| 17 |
Dia Españaempleo.dia.es
Leading proximity stores network with over 5,400 locations in Spain, Argentina, Brazil, and Portugal Committed to quality, community impact, and customer satisfaction |
2,438 | |||
| 18 |
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 | |||
| 19 |
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 | |||
| 20 |
EDP Renewablesedpr.com
Global renewable energy company specializing in wind power generation with extensive international presence and significant operating capacity. |
1,449 | |||
| 21 |
Mediaset Españamediaset.es
Leading Spanish audiovisual group offering TV channels, digital platforms, film production, advertising, and content distribution across multiple global markets. |
1,364 | |||
| 22 |
Econocom Españaeconocom.es
Econocom provides digital transformation solutions for large companies and public organizations, with financing, equipment distribution, and digital services expertise Operating in 16 countries with over 8,750 employees |
1,305 | |||
| 23 |
Sngularsngular.com
A next-generation technology partner delivering innovative solutions with deep expertise, a global network of innovators, and a focus on sustainability |
1,285 | |||
| 24 |
ROVI Pharmaceutical Companyrovi.es
Chemical and pharmaceutical company focused on own products, third-party manufacturing, and licensed product distribution to promote health globally. |
1,273 | |||
| 25 |
Naturhousenaturhouse.com
Franchise offering personalized weight loss programs designed by dietitians, based on reeducating eating habits to achieve a healthy weight Free consultations provided |
1,249 | |||
| 26 | 1,239 | ||||
| 27 | 1,219 | ||||
| 28 |
Allfundsallfunds.com
Connecting fund partners and distributors, offering mutual funds, ETFs, and alternatives on a scalable technology platform. Global dealing and distribution. |
1,194 | |||
| 29 |
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 | |||
| 30 |
CHINAllyc.global
It is an advertising agency founded in 2010, focusing on solving client problems rather than just managing accounts for advertisers. |
978 | |||
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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 12, 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
- Corporate groups and holding companies in Madrid 89
- Business Consulting and Services companies in Madrid 80