Company lists · Data refreshed September 2026
Top 25 Enterprise telecom companies based in Madrid, Spain
RevenueBase identified 98 enterprise telecom companies headquartered in Madrid, Spain as of September 2026 and tracks 58,401 professional contacts across them, including 6,384 with verified work emails. Madrid is the largest hub.
This list covers enterprise telecom companies headquartered in Madrid, Spain, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest enterprise telecom companies based in Madrid, Spain
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 54,718 contacts → | ||||
Partial evidence “Telefónica is today one of the largest telecommunications companies in the world in terms of market capitalisation and number of customers.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,125 contacts → | ||||
Indirect evidence “En Zelenza somos líderes en servicios integrados TIC, Ingeniería de Redes Telco, Defensa y Seguridad y Customer Experience.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 294 contacts → | ||||
Indirect evidence “As the world’s needs for uninterrupted global interconnectivity continue to rise, we are preparing the road ahead.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 172 contacts → | ||||
Partial evidence “FULL ON NET es una empresa altamente especializada en desarrollos y servicios dentro del entorno tecnológico de Internet y las Telecomunicaciones, dirigida e integrada por…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 155 contacts → | ||||
Partial evidence “eXperience es una empresa de servicios orientada al mercado de las Tecnologías de la Información y las Telecomunicaciones, dando soluciones integrales en las áreas de consultoría…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 93 contacts → | ||||
Partial evidence “mdtel is a manufacturer and integrator of corporate telecommunications solutions for business environments with more than 20 years of experience.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 88 contacts → | ||||
Indirect evidence “Coyser S.A.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 82 contacts → | ||||
Partial evidence “SORTIS: Líder en Soluciones Integrales de Telecomunicaciones y TI desde 2005.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 72 contacts → | ||||
Partial evidence “Premium Numbers, operador de telecomunicaciones inscrito en la CMT y con numeración propia, fue fundada en el año 2.001, siendo una de las empresas del sector de la telefonía de…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 57 contacts → | ||||
Indirect evidence “Transformamos lo complejo en soluciones tecnológicas simples y eficaces.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 55 contacts → | ||||
Indirect evidence “SODITEL NUEVO PARTNER TECNOLÓGICO DE AASTRA EN ESPAÑA El gran nivel profesional y su avalada y reconocida garantía en la prestación de servicios profesionales, han convertido a…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 41 contacts → | ||||
Indirect evidence “Silbö es la nueva telco que solo te contará cosas que suenan bien.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 38 contacts → | ||||
Indirect evidence “Actualmente Axians España” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 32 contacts → | ||||
Partial evidence “At Olin Group we are experts in telecommunications services in the regional market; both for wholesalers, with our high-speed Olinfra network, and for retailers through the…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 29 contacts → | ||||
Partial evidence “Somos una compañía especializada en servicios de Telecomunicaciones y Sistemas con mas de 20 años de experiencia prestando servicios a organizaciones públicas y privadas.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 26 contacts → | ||||
Partial evidence “We are a leading provider of Telecommunications services for large companies, SMEs, self-employed professionals, and individuals.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 23 contacts → | ||||
Indirect evidence “In Comunica we offer connectivity solutions, telephony, IoT and cloud services tailored for businesses.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 22 contacts → | ||||
Partial evidence “Desde 1989, en TECNIMART estamos dedicados al desarrollo de proyectos de telecomunicaciones dentro y fuera de España en los sectores de Sanidad Hospitales, Seguros, Automoción y…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 13 contacts → | ||||
Partial evidence “Balesia Technologies Inc, part of the Balesia group, an American company with more than 40 years of experience and telecommunications management experience in more than 60…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 10 contacts → | ||||
Partial evidence “Tel Telecomunicaciones es una de las empresas más importantes y cualificadas para prestar servicios en el campo de las telecomunicaciones.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 10 contacts → | ||||
Indirect evidence “Sedaser ofrece todo tipo de Soluciones Tecnológicas.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 9 contacts → | ||||
Indirect evidence “Founded in 2007, offices in Madrid and Barcelona and hundreds of business reference.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 6 contacts → | ||||
Indirect evidence “En Smart Connect ayudamos a empresas, pymes y profesionales a mejorar sus comunicaciones e infraestructura tecnológica con soluciones adaptadas a las necesidades reales de cada…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 3 contacts → | ||||
Partial evidence “Somos un Proveedor Tecnológico con más de 25 años de experiencia en el sector de las telecomunicaciones, formado por un equipo multidisciplinar, experto en adaptarse a las…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 2 contacts → | ||||
Partial evidence “Infocaller combines the latest telecommunications technologies with the power of the internet in order to provide simple yet powerful communication services for companies…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: enterprise telecom companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names enterprise telecom companies.
- Partial evidence
- Its own public description names part of enterprise telecom companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name enterprise telecom companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 98 enterprise telecom companies based in Madrid, Spain
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Enterprise telecom companies based in Madrid, Spain at a glance
As of Sep 21, 2026Companies by employee count
Email recency for this list is measured across the whole Spain list rather than for Madrid, so it is reported there. Company counts and contact totals on this page are exact for Madrid, over 98 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among enterprise telecom companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in Madrid, Spain whose own description of what they do matches “enterprise telecom companies”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names enterprise telecom companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among enterprise telecom companies, and records with no verified work email. Companies headquartered outside Madrid are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 6,384 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 21, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Enterprise telecom companies by metro in Spain
- Enterprise telecom companies in Madrid98
- Enterprise telecom companies in Barcelona47
- Enterprise telecom companies in Malaga28
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names enterprise telecom companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many enterprise telecom companies are there based in Madrid, Spain?
RevenueBase identified 98 enterprise telecom companies headquartered in Madrid, Spain as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Telefónica, headquartered in Madrid, tops this list with the largest team on record.
Which city has the most enterprise telecom companies?
Madrid leads with 98 headquartered companies, followed by Barcelona (47) and Malaga (28).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 6,384 verified decision-maker contacts tracked across these 98 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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