Company lists · Data refreshed September 2026

Top 25 Telecommunications utility companies based in Spain

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 232 companies tracked

RevenueBase identified 232 telecommunications utility companies headquartered in Spain as of September 2026 and tracks 61,750 professional contacts across them, including 6,414 with verified work emails. Madrid is the largest hub.

This list covers telecommunications utility 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 19, 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 19, 2026 86% judged on-target in blind review

232Companies

61,750Contacts tracked

6,414Verified emails

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The 25 largest telecommunications utility companies based in Spain

Ranked by team size

Top 25 of 232 telecommunications utility companies based in Spain, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to telecommunications utility 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 19, 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 19, 2026
2	Digi Spain Telecom	Indirect evidence	Alcobendas, SpainHQ checked Sep 19, 2026	10001+	2,658 contacts →
	Indirect evidence “DIGI es una empresa que pertenece a la multinacional DIGI Communications, con 30 años de experiencia en el sector de las telecomunicaciones y presente en España desde 2008 donde…” Source: RevenueBase Database · checked Sep 19, 2026
3	ONO	Indirect evidence	Pozuelo De Alarcón, SpainHQ checked Sep 19, 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 19, 2026
4	Adamo Telecom Iberia S.A.U	Indirect evidence	Barcelona, SpainHQ checked Sep 19, 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 19, 2026
5	Telxius	Indirect evidence	Madrid, SpainHQ checked Sep 19, 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 19, 2026
6	Aire Networks	Indirect evidence	Elche, SpainHQ checked Sep 19, 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 19, 2026
7	Cableworld	Indirect evidence	Alicante, SpainHQ checked Sep 19, 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 19, 2026
8	Instelca	Indirect evidence	Málaga, SpainHQ checked Sep 19, 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 19, 2026
9	Sarenet	Indirect evidence	Zamudio, SpainHQ checked Sep 19, 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 19, 2026
10	Coyser SA	Indirect evidence	Madrid, SpainHQ checked Sep 19, 2026	51-200	88 contacts →
	Indirect evidence “Coyser S.A.” Source: RevenueBase Database · checked Sep 19, 2026
11	Ausarta	Indirect evidence	Erandio, SpainHQ checked Sep 19, 2026	51-200	72 contacts →
	Indirect evidence “Tu operador de Telecomunicaciones” Source: RevenueBase Database · checked Sep 19, 2026
12	Netllar Telecom	Indirect evidence	Albal, SpainHQ checked Sep 19, 2026	201-500	52 contacts →
	Indirect evidence “Somos una compañía con una dilatada experiencia ubicada en el sector de las nuevas tecnologías, como operador nacional de telecomunicaciones nuestra actividad se centra en…” Source: RevenueBase Database · checked Sep 19, 2026
13	WIBER	Indirect evidence	Motril, SpainHQ checked Sep 19, 2026	51-200	51 contacts →
	Indirect evidence “Tarifa plana de calidad y buen servicio.” Source: RevenueBase Database · checked Sep 19, 2026
14	EMBOU	Indirect evidence	Zaragoza, SpainHQ checked Sep 19, 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 19, 2026
15	Silbö Telecom	Indirect evidence	Madrid, SpainHQ checked Sep 19, 2026	11-50	41 contacts →
	Indirect evidence “Silbö es la nueva telco que solo te contará cosas que suenan bien.” Source: RevenueBase Database · checked Sep 19, 2026
16	Mattelco	Indirect evidence	Sabadell, SpainHQ checked Sep 19, 2026	51-200	37 contacts →
	Indirect evidence “Confiamos en que nuestros valores y filosofía nos van a llevar muy lejos.” Source: RevenueBase Database · checked Sep 19, 2026
17	Fibranet Telecomunicaciones	Indirect evidence	Murcia, SpainHQ checked Sep 19, 2026	51-200	35 contacts →
	Indirect evidence “FIBRANET \| Operador Nacional de Telecomunicaciones FIBRANET es un operador de telecomunicaciones con más de 30 años de experiencia en el sector perteneciente a Olin Group.” Source: RevenueBase Database · checked Sep 19, 2026
18	Iquadrat	Partial evidence	Barcelona, SpainHQ checked Sep 19, 2026	11-50	32 contacts →
	Partial evidence “iquadrat desarrolla desde 1997 soluciones globales y servicios en la utilización de Internet y las Telecomunicaciones a empresas e instituciones que utilizan las tecnologías de la…” Source: RevenueBase Database · checked Sep 19, 2026
19	Olin Group	Partial evidence	Madrid, SpainHQ checked Sep 19, 2026	n/a	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 19, 2026
20	Zertia Telecomunicaciones S.L	Indirect evidence	Alcobendas, SpainHQ checked Sep 19, 2026	51-200	29 contacts →
	Indirect evidence “Zertia Telecomunicaciones es un proveedor global de Servicios Gestionados de Telecomunicaciones para empresas, que ofrece soluciones y proyectos a medida, encargándose de la…” Source: RevenueBase Database · checked Sep 19, 2026
21	Delinternet Telecom	Indirect evidence	Deltebre, SpainHQ checked Sep 19, 2026	11-50	28 contacts →
	Indirect evidence “Benvinguts/es a Delinternet, la teva operadora de telecomunicacions de referència a les Terres de l'Ebre.” Source: RevenueBase Database · checked Sep 19, 2026
22	BG Group BG Mobile BG Smart BG Energía	Indirect evidence	Sant Cugat Del Vallès, SpainHQ checked Sep 19, 2026	11-50	28 contacts →
	Indirect evidence “BG MOBILE - Distribuidor Vodafone Empresas Especialistas en Digitalización y nuevas tecnologías para empresas.” Source: RevenueBase Database · checked Sep 19, 2026
23	ISC	Indirect evidence	Barcelona, SpainHQ checked Sep 19, 2026	51-200	24 contacts →
	Indirect evidence “Conectamos tus proyectos.” Source: RevenueBase Database · checked Sep 19, 2026
24	NODO	Indirect evidence	Murcia, SpainHQ checked Sep 19, 2026	11-50	21 contacts →
	Indirect evidence “Somos profesionales en el transporte de palabras, imágenes, datos, sonidos, mensajes y emociones.” Source: RevenueBase Database · checked Sep 19, 2026
25	PC Mancha	Indirect evidence	Quintanar De La Orden, SpainHQ checked Sep 19, 2026	11-50	17 contacts →
	Indirect evidence “PC Mancha es un operador local de telecomunicaciones y servicios tecnológicos que ofrece soluciones de conectividad, comunicaciones, seguridad y soporte informático para empresas…” Source: RevenueBase Database · checked Sep 19, 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: telecommunications utility 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 telecommunications utility companies.
Partial evidence: Its own public description names part of telecommunications utility companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name telecommunications utility 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 232 telecommunications utility companies based in Spain

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Telecommunications utility companies based in Spain at a glance

As of Sep 19, 2026

10.4%Verified-email coverage

266.2Average contacts per company

11-50Median size (employees)

9.5%Largest-city concentration · Madrid

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 232 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 telecommunications utility 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 “telecommunications utility 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 telecommunications utility 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 telecommunications utility 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, 6,414 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 19, 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.

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 telecommunications utility 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 telecommunications utility companies are there based in Spain?

RevenueBase identified 232 telecommunications utility 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 telecommunications utility companies?

Madrid leads with 22 headquartered companies, followed by Barcelona (11) and Murcia (10).

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 6,414 verified decision-maker contacts tracked across these 232 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 19, 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.