These Madrid-based companies operate primarily in telecommunications, media, and security, with a mix of established groups and younger firms. Telefónica is a global telecommunications company. Prosegur specializes in private security solutions. Endesa is active in electricity and natural gas. Nova connects talent with opportunities and provides B2B services. ¡HOLA! publishes magazines and web content. El País is a daily newspaper.
The data shows a concentration of companies founded in the mid-20th century, such as Endesa and ¡HOLA! from 1944, and APD from 1956. However, there are also more recent large firms like Nova and Movistar Prosegur Alarmas, both founded in 2020.
| # | 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 |
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 | |||
| 4 |
Novanovatalent.com
Global community connecting top talent with opportunities, offering rigorous screening for high-potential individuals, B2B services for top clients, and launching B2C premium services |
6,899 | |||
| 5 |
¡HOLA!grupohola.com
Publisher of ¡HOLA! and HELLO! magazine with over 60 years of history, producing web content with millions of users and social media followers Leader in female information |
2,054 | |||
| 6 |
El Paiselpais.com
A leading daily newspaper in Spanish and Portuguese with a focus on quality journalism, progressive values, and democracy, catering to a global audience |
1,564 | |||
| 7 |
idealistaidealista.com
A leading real estate platform helping people find homes or properties for sale or rent through innovative, data-driven services worldwide |
1,388 | |||
| 8 |
Mediaset Españamediaset.es
Leading Spanish audiovisual group offering TV channels, digital platforms, film production, advertising, and content distribution across multiple global markets. |
1,364 | |||
| 9 | 1,219 | ||||
| 10 | 1,203 | ||||
| 11 |
Movistar Prosegur Alarmasmovistarproseguralarmas.es
A unique and pioneering company combining physical security with connectivity to provide comprehensive security systems for homes and businesses |
1,182 | |||
| 12 |
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 | |||
| 13 | 1,060 | ||||
| 14 |
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 | |||
| 15 |
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 | |||
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 |
LEGÁLITASlegalitas.com
Legalitas provides legal advice to individuals, self-employed individuals, and businesses, offering personalized and economical services through a team of over 250 experienced lawyers |
616 | |||
| 17 |
Diario ABCabc.es
Provides credible, instant news on mobile devices, upholds freedom, equality, Spanish values, journalism, culture, and education. |
547 | |||
| 18 |
Hilti Españahilti.es
Global leader in providing technology-leading products, systems, and services to the construction industry, focusing on innovation, customer excellence, and nurturing high-performing people |
528 | |||
| 19 |
RENFE OPERADORArenfe.com
A transportation company based in Madrid, Spain, specializing in rail services for passengers and freight |
451 | |||
| 20 |
Brooklyn Fitboxing Internationaldiscover.brooklynfitboxing.com
A fitness training experience combining boxing, muay thai, kickboxing, and functional training with music, technology, and charity initiatives for global impact |
425 | |||
| 21 |
ACNUR Comité españoleacnur.org
Supports UNHCR in providing humanitarian aid to vulnerable refugees worldwide, raising awareness and social support for their programs |
403 | |||
| 22 | 360 | ||||
| 23 |
El Independienteelindependiente.com
A digital media company founded in 2016, focusing on political, economic news and opinion Emphasizes quality information, original content, and new storytelling |
348 | |||
| 24 |
Vivofácilvivofacil.com
The company provides private care services to individuals in their homes, promoting equality, work-life balance, and improving quality of life |
342 | |||
| 25 |
elDiario.eseldiario.es
A digital media platform focused on providing information and analysis on politics and economy with an emphasis on human rights, equality, and democracy |
341 | |||
| 26 | 313 | ||||
| 27 |
AltaFit Gym Clubaltafitgymclub.com
Altafit is a leading franchise network of Low Cost Gyms in Spain with over 15 years of experience managing top-notch sports facilities and gyms |
306 | |||
| 28 |
TaxDownempresas.taxdown.es
TaxDown is a Spanish company revolutionizing tax advisory with a digital platform for easy and accurate tax filing, maximizing savings for users |
294 | |||
| 29 |
PLAYTOMICplaytomic.com
Playtomic offers a leading app for racket players worldwide, allowing users to book courts, meet other players, join groups, and improve skills |
277 | |||
| 30 |
Enjoy Wellnessenjoy.es
A wellness organization promoting access to sports and exercise for all ages, emphasizing health, fun, and community through high-quality facilities and services |
268 | |||
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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
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- Multinational companies in Madrid 815
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- Financial services firms in Madrid 231
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- Wellness and Fitness Services companies in Madrid 202
- Critical infrastructure operators in Madrid 169
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- SaaS companies in Madrid 113
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- Corporate groups and holding companies in Madrid 89
- Business Consulting and Services companies in Madrid 80