Company lists · Data refreshed September 2026

Top 25 Enterprise telecommunications providers based in Spain

Name: Enterprise telecommunications providers based in Spain
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 534 companies tracked

RevenueBase identified 534 enterprise telecommunications providers headquartered in Spain as of September 2026 and tracks 62,434 professional contacts across them, including 6,898 with verified work emails. Madrid is the largest hub.

This list covers enterprise telecommunications providers headquartered in 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 28, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

534Companies

62,434Contacts tracked

6,898Verified emails

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The 25 largest enterprise telecommunications providers based in Spain

Ranked by team size

Top 25 of 534 enterprise telecommunications providers based in Spain, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to enterprise telecommunications providers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Telefónica	Partial evidence	Madrid, SpainHQ checked Sep 28, 2026	10001+	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 28, 2026
2	Nunsys	Indirect evidence	Paterna, SpainHQ checked Sep 28, 2026	1,001-5,000	739 contacts →
	Indirect evidence “NUNSYS es una empresa especializada en la Implantación de Soluciones Integrales de Tecnología.” Source: RevenueBase Database · checked Sep 28, 2026
3	ONO	Indirect evidence	Pozuelo De Alarcón, SpainHQ checked Sep 28, 2026	1,001-5,000	396 contacts →
	Indirect evidence “ONO es la compañía de comunicación y entretenimiento por fibra óptica líder en España.” Source: RevenueBase Database · checked Sep 28, 2026
4	Commcenter	Indirect evidence	A Coruña, SpainHQ checked Sep 28, 2026	501-1,000	372 contacts →
	Indirect evidence “CommCenter es uno de los distribuidores de telecomunicaciones independientes de mayor impacto en nuestro país.” Source: RevenueBase Database · checked Sep 28, 2026
5	Adamo Telecom Iberia S.A.U	Indirect evidence	Barcelona, SpainHQ checked Sep 28, 2026	51-200	298 contacts →
	Indirect evidence “Adamo is a telecom operator with Swedish origin operating in Spain since 2007.” Source: RevenueBase Database · checked Sep 28, 2026
6	Telxius	Indirect evidence	Madrid, SpainHQ checked Sep 28, 2026	201-500	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 28, 2026
7	ACENS	Indirect evidence	Alcobendas, SpainHQ checked Sep 28, 2026	201-500	276 contacts →
	Indirect evidence “acens, perteneciente al Grupo acens Technologies, es una empresa proveedora de servicios de “Hosting”, “Housing” y Soluciones de Telecomunicaciones para el mercado empresarial.” Source: RevenueBase Database · checked Sep 28, 2026
8	Aire Networks	Indirect evidence	Elche, SpainHQ checked Sep 28, 2026	201-500	177 contacts →
	Indirect evidence “Aire Networks, encompasses all the communication services that a company needs to boost its business, with all the advantages and benefits of working with a single service…” Source: RevenueBase Database · checked Sep 28, 2026
9	GIGAS	Indirect evidence	Alcobendas, SpainHQ checked Sep 28, 2026	201-500	161 contacts →
	Indirect evidence “Set up in 2011, Gigas is an international group specializing in providing converged and turnkey communications and cloud services for businesses.” Source: RevenueBase Database · checked Sep 28, 2026
10	Cableworld	Indirect evidence	Alicante, SpainHQ checked Sep 28, 2026	201-500	132 contacts →
	Indirect evidence “Cableworld es la compañía de servicios de telecomunicaciones por fibra óptica líder en en sus zonas de influencia, en la que ofrecemos de manera integrada servicios de Internet…” Source: RevenueBase Database · checked Sep 28, 2026
11	Instelca	Indirect evidence	Málaga, SpainHQ checked Sep 28, 2026	201-500	118 contacts →
	Indirect evidence “El Grupo INSTELCA es proveedor global de servicios de Telecomunicaciones, Redes e Informática con más de 30 años de experiencia y con una clara orientación al clientes que nos ha…” Source: RevenueBase Database · checked Sep 28, 2026
12	Gamma Comunicaciones	Indirect evidence	Cerdanyola Del Vallés, SpainHQ checked Sep 28, 2026	51-200	105 contacts →
	Indirect evidence “VozTelecom es la compañía especialista en comunicaciones cloud y líder en telefonía IP dentro del segmento de la pequeña y mediana empresa en España.” Source: RevenueBase Database · checked Sep 28, 2026
13	Cableven	Indirect evidence	Málaga, SpainHQ checked Sep 28, 2026	501-1,000	103 contacts →
	Indirect evidence “Empresa cualificada y especializada en la instalación y mantenimiento de redes y equipos de telecomunicaciones.” Source: RevenueBase Database · checked Sep 28, 2026
14	MDTEL	Partial evidence	Madrid, SpainHQ checked Sep 28, 2026	51-200	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 28, 2026
15	Sarenet	Indirect evidence	Zamudio, SpainHQ checked Sep 28, 2026	51-200	90 contacts →
	Indirect evidence “Sarenet es el proveedor de voz y datos con más experiencia de cuantos hoy operan en España.” Source: RevenueBase Database · checked Sep 28, 2026
16	Coyser SA	Indirect evidence	Madrid, SpainHQ checked Sep 28, 2026	51-200	88 contacts →
	Indirect evidence “Coyser S.A.” Source: RevenueBase Database · checked Sep 28, 2026
17	Sortis	Indirect evidence	Madrid, SpainHQ checked Sep 28, 2026	51-200	82 contacts →
	Indirect evidence “SORTIS: Líder en Soluciones Integrales de Telecomunicaciones y TI desde 2005.” Source: RevenueBase Database · checked Sep 28, 2026
18	B2com	Indirect evidence	Madrid, SpainHQ checked Sep 28, 2026	51-200	72 contacts →
	Indirect 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 28, 2026
19	Ausarta	Indirect evidence	Erandio, SpainHQ checked Sep 28, 2026	51-200	72 contacts →
	Indirect evidence “Tu operador de Telecomunicaciones” Source: RevenueBase Database · checked Sep 28, 2026
20	Claranet Spain	Indirect evidence	Hospitalet De Llobregat, SpainHQ checked Sep 28, 2026	1,001-5,000	67 contacts →
	Indirect evidence “Founded in 1996, Claranet is one of Europe's leading managed IT services providers.” Source: RevenueBase Database · checked Sep 28, 2026
21	Makenai Solutions, Innovation & Creative Ideas	Indirect evidence	Madrid, SpainHQ checked Sep 28, 2026	11-50	57 contacts →
	Indirect evidence “Transformamos lo complejo en soluciones tecnológicas simples y eficaces.” Source: RevenueBase Database · checked Sep 28, 2026
22	Soditel	Indirect evidence	Madrid, SpainHQ checked Sep 28, 2026	11-50	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 28, 2026
23	ISP Grup	Indirect evidence	Les Franqueses Del Vallés, SpainHQ checked Sep 28, 2026	201-500	50 contacts →
	Indirect evidence “ISP Grup nació en con la visión de que las telecomunicaciones serían el futuro.” Source: RevenueBase Database · checked Sep 28, 2026
24	EMBOU	Indirect evidence	Zaragoza, SpainHQ checked Sep 28, 2026	11-50	50 contacts →
	Indirect evidence “Somos la operadora aragonesa líder en red de acceso a banda ancha en Aragón y zonas limítrofes mediante la integración de las tecnologías más avanzadas en telecomunicaciones.” Source: RevenueBase Database · checked Sep 28, 2026
25	Instel	Indirect evidence	Barcelona, SpainHQ checked Sep 28, 2026	11-50	46 contacts →
	Indirect evidence “Más de 50 años liderando la transformación digital Somos una empresa de servicios del sector de las telecomunicaciones, con un origen familiar, especialistas en la integración de…” Source: RevenueBase Database · checked Sep 28, 2026

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 telecommunications providers. 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 telecommunications providers.
Partial evidence: Its own public description names part of enterprise telecommunications providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name enterprise telecommunications providers. 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 534 enterprise telecommunications providers based in Spain

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Enterprise telecommunications providers based in Spain at a glance

As of Sep 28, 2026

11.0%Verified-email coverage

116.9Average contacts per company

11-50Median size (employees)

17.0%Largest-city concentration · Madrid

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

244

11-50

215

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for Spain, so it is reported there. Company counts and contact totals on this page are exact for Spain, over 534 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 telecommunications providers, 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 Spain whose own description of what they do matches “enterprise telecommunications providers”. 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 telecommunications providers), 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 telecommunications providers, and records with no verified work email. Companies headquartered outside Spain 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, 6,898 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 28, 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 telecommunications providers by metro

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 telecommunications providers, 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 telecommunications providers are there based in Spain?

RevenueBase identified 534 enterprise telecommunications providers headquartered in 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 telecommunications providers?

Madrid leads with 91 headquartered companies, followed by Barcelona (46) and Malaga (20).

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 6,898 verified decision-maker contacts tracked across these 534 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 28, 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.