Company lists · Data refreshed September 2026

Top 25 Enterprise telecom companies based in Spain

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 615 companies tracked

RevenueBase identified 615 enterprise telecom companies headquartered in Spain as of September 2026 and tracks 65,547 professional contacts across them, including 7,198 with verified work emails. Madrid is the largest hub.

This list covers enterprise telecom companies 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 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review

615Companies

65,547Contacts tracked

7,198Verified emails

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The 25 largest enterprise telecom companies based in Spain

Ranked by team size

Top 25 of 615 enterprise telecom companies based in Spain, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to enterprise telecom companies: 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 21, 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 21, 2026
2	Zelenza	Indirect evidence	Madrid, SpainHQ checked Sep 21, 2026	1,001-5,000	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, 2026
3	Nunsys	Indirect evidence	Paterna, SpainHQ checked Sep 21, 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 21, 2026
4	OFG	Partial evidence	Córdoba, SpainHQ checked Sep 21, 2026	1,001-5,000	701 contacts →
	Partial evidence “OFG is an international company with more than 20 years of experience in the telecommunications sector.” Source: RevenueBase Database · checked Sep 21, 2026
5	ONO	Indirect evidence	Pozuelo De Alarcón, SpainHQ checked Sep 21, 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 21, 2026
6	Commcenter	Partial evidence	A Coruña, SpainHQ checked Sep 21, 2026	501-1,000	372 contacts →
	Partial evidence “CommCenter es uno de los distribuidores de telecomunicaciones independientes de mayor impacto en nuestro país.” Source: RevenueBase Database · checked Sep 21, 2026
7	Adamo Telecom Iberia S.A.U	Partial evidence	Barcelona, SpainHQ checked Sep 21, 2026	51-200	298 contacts →
	Partial evidence “Adamo is a telecom operator with Swedish origin operating in Spain since 2007.” Source: RevenueBase Database · checked Sep 21, 2026
8	Telxius	Indirect evidence	Madrid, SpainHQ checked Sep 21, 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 21, 2026
9	ACENS	Partial evidence	Alcobendas, SpainHQ checked Sep 21, 2026	201-500	276 contacts →
	Partial 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 21, 2026
10	Aire Networks	Indirect evidence	Elche, SpainHQ checked Sep 21, 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 21, 2026
11	Full On NET	Partial evidence	Madrid, SpainHQ checked Sep 21, 2026	51-200	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, 2026
12	GIGAS	Indirect evidence	Alcobendas, SpainHQ checked Sep 21, 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 21, 2026
13	Experience IT Solutions	Partial evidence	Madrid, SpainHQ checked Sep 21, 2026	201-500	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, 2026
14	Cableworld	Partial evidence	Alicante, SpainHQ checked Sep 21, 2026	201-500	132 contacts →
	Partial 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 21, 2026
15	Instelca	Partial evidence	Málaga, SpainHQ checked Sep 21, 2026	201-500	118 contacts →
	Partial 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 21, 2026
16	Gamma Comunicaciones	Indirect evidence	Cerdanyola Del Vallés, SpainHQ checked Sep 21, 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 21, 2026
17	MDTEL	Partial evidence	Madrid, SpainHQ checked Sep 21, 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 21, 2026
18	Sarenet	Indirect evidence	Zamudio, SpainHQ checked Sep 21, 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 21, 2026
19	Telecomunicación DE Levante SL	Partial evidence	Alicante, SpainHQ checked Sep 21, 2026	1,001-5,000	90 contacts →
	Partial evidence “Telecomunicación de Levante (Teleco) inició su actividad hace más de tres décadas con Telefónica como principal cliente.” Source: RevenueBase Database · checked Sep 21, 2026
20	Coyser SA	Indirect evidence	Madrid, SpainHQ checked Sep 21, 2026	51-200	88 contacts →
	Indirect evidence “Coyser S.A.” Source: RevenueBase Database · checked Sep 21, 2026
21	Afr-Ix Telecom	Partial evidence	Sant Adrià De Besòs, SpainHQ checked Sep 21, 2026	51-200	85 contacts →
	Partial evidence “AFR-IX telecom is a global telecommunications infrastructure group with licensed operations and infrastructure presence across Europe, Africa, Middle East and the Americas…” Source: RevenueBase Database · checked Sep 21, 2026
22	Sortis	Partial evidence	Madrid, SpainHQ checked Sep 21, 2026	51-200	82 contacts →
	Partial evidence “SORTIS: Líder en Soluciones Integrales de Telecomunicaciones y TI desde 2005.” Source: RevenueBase Database · checked Sep 21, 2026
23	B2com	Partial evidence	Madrid, SpainHQ checked Sep 21, 2026	51-200	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, 2026
24	Ausarta	Partial evidence	Erandio, SpainHQ checked Sep 21, 2026	51-200	72 contacts →
	Partial evidence “Tu operador de Telecomunicaciones” Source: RevenueBase Database · checked Sep 21, 2026
25	Claranet Spain	Indirect evidence	Hospitalet De Llobregat, SpainHQ checked Sep 21, 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 21, 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 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 615 enterprise telecom companies based in Spain

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Enterprise telecom companies based in Spain at a glance

As of Sep 21, 2026

11.0%Verified-email coverage

106.6Average contacts per company

11-50Median size (employees)

15.9%Largest-city concentration · Madrid

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

267

11-50

253

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 615 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 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 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, 7,198 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

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 Spain?

RevenueBase identified 615 enterprise telecom companies 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 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 7,198 verified decision-maker contacts tracked across these 615 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.