Company lists · Data refreshed September 2026
Top 25 Telecommunications infrastructure companies based in Spain
RevenueBase identified 370 telecommunications infrastructure companies headquartered in Spain as of September 2026 and tracks 64,243 professional contacts across them, including 6,660 with verified work emails. Madrid is the largest hub.
This list covers telecommunications infrastructure 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 16, 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 telecommunications infrastructure companies based in 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 16, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,498 contacts → | ||||
Strong evidence “Cellnex is Europe’s largest telecommunications towers and infrastructures operator, enabling operators to access a wide network of telecommunications infrastructures on a…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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 16, 2026Thanks. The Data Team will review it. | |||||
| 4 | 684 contacts → | ||||
Indirect evidence “Empresa especializada en la ingenieria, desarrollo, construccion, instalación, y puesta en marcha de instalaciones de telecomunicaciones, electricidad, señalización, redes de…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 5 | 628 contacts → | ||||
Indirect evidence “Insyte Instalaciones inicia su actividad en 1990 como empresa instaladora en el sector eléctrico y de telecomunicaciones.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 6 | 455 contacts → | ||||
Indirect evidence “Circet España, empresa líder del sector de las telecomunicaciones en España, con implantación a nivel Nacional.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 7 | 396 contacts → | ||||
Indirect evidence “ONO es la compañía de comunicación y entretenimiento por fibra óptica líder en España.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 8 | 298 contacts → | ||||
Indirect evidence “Adamo is a telecom operator with Swedish origin operating in Spain since 2007.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 9 | 186 contacts → | ||||
Partial evidence “Cad & Lan was founded in 1990 as a digital infrastructure and communications company.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 10 | 157 contacts → | ||||
Indirect evidence “lyntia is the leading wholesale optic fibre operator in Spain and Portugal, providing robust, flexible and sustainable connectivity solutions for the Telco and Cloud sector.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 11 | 142 contacts → | ||||
Indirect evidence “Somos referentes en en la gestión de infraestructuras de telecomunicaciones en España.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 12 | 139 contacts → | ||||
Indirect evidence “Inet es una empresa del grupo AXIS CORPORATE especializada en procesos de despliegue y mantenimiento de infraestructuras tecnológicas y comunicaciones para empresas.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 13 | 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 16, 2026Thanks. The Data Team will review it. | |||||
| 14 | 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 16, 2026Thanks. The Data Team will review it. | |||||
| 15 | 110 contacts → | ||||
Indirect evidence “Smart Telecom Consulting, empresa de ingeniería especializada en el campo de la telefonia móvil ofreciendo soluciones integrales a nuestros clientes desde el año 2004.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 16 | 103 contacts → | ||||
Indirect evidence “Empresa cualificada y especializada en la instalación y mantenimiento de redes y equipos de telecomunicaciones.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 17 | 92 contacts → | ||||
Indirect evidence “Cablescom es una de las principales compañías europeas dedicadas al diseño, fabricación y comercialización de cables de telecomunicaciones, señalización y fibra óptica.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 18 | 85 contacts → | ||||
Strong 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 16, 2026Thanks. The Data Team will review it. | |||||
| 19 | 78 contacts → | ||||
Indirect evidence “CIE Tecnologías, es hoy una empresa establecida en el sector de las telecomunicaciones y desarrolla su actividad centrándose en el diseño e implementación de tecnologías e…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 20 | 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 16, 2026Thanks. The Data Team will review it. | |||||
| 21 | 72 contacts → | ||||
Indirect evidence “Tu operador de Telecomunicaciones” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 22 | 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 16, 2026Thanks. The Data Team will review it. | |||||
| 23 | 45 contacts → | ||||
Indirect evidence “Ingeniería, Consultoría e Instalación de Telecomunicaciones Trabajamos a nivel local, regional y nacional tanto para pequeñas y medianas empresas como para grandes organizaciones.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 24 | 43 contacts → | ||||
Indirect evidence “English below) Fundada en 1998 para atender al mercado de las telecomunicaciones públicas, y disponiendo de unas instalaciones de 1.500 m2, destinadas al diseño y fabricación…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 25 | 41 contacts → | ||||
Indirect evidence “Silbö es la nueva telco que solo te contará cosas que suenan bien.” Source: RevenueBase Database · checked Sep 16, 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: telecommunications infrastructure 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 infrastructure companies.
- Partial evidence
- Its own public description names part of telecommunications infrastructure companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name telecommunications infrastructure 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 370 telecommunications infrastructure companies based in Spain
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Telecommunications infrastructure companies based in Spain at a glance
As of Sep 16, 2026Companies by employee count
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 370 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 infrastructure 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 infrastructure 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 infrastructure 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 infrastructure 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, 6,660 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 16, 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.
Telecommunications infrastructure companies by metro
- Telecommunications infrastructure companies in Madrid53
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 infrastructure 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 infrastructure companies are there based in Spain?
RevenueBase identified 370 telecommunications infrastructure 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 infrastructure companies?
Madrid leads with 53 headquartered companies, followed by Barcelona (21) and Murcia (12).
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 6,660 verified decision-maker contacts tracked across these 370 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 16, 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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