Company lists · Data refreshed September 2026

Top 25 Fiber optic telecommunications companies based in Spain

Name: Fiber optic telecommunications companies based in Spain
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 265 companies tracked

RevenueBase identified 265 fiber optic telecommunications companies headquartered in Spain as of September 2026 and tracks 8,354 professional contacts across them, including 658 with verified work emails. Madrid is the largest hub.

This list covers fiber optic telecommunications 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 30, 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 30, 2026 86% judged on-target in blind review

265Companies

8,354Contacts tracked

658Verified emails

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The 25 largest fiber optic telecommunications companies based in Spain

Ranked by team size

Top 25 of 265 fiber optic telecommunications companies based in Spain, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to fiber optic telecommunications 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	Digi Spain Telecom	Indirect evidence	Alcobendas, SpainHQ checked Sep 30, 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 30, 2026
2	Ufinet	Indirect evidence	Madrid, SpainHQ checked Sep 30, 2026	1,001-5,000	1,182 contacts →
	Indirect evidence “UFINET is a Latin American carrier of carriers providing high-quality solutions in the wholesale telecom market.” Source: RevenueBase Database · checked Sep 30, 2026
3	Avatel Telecom	Indirect evidence	Madrid, SpainHQ checked Sep 30, 2026	1,001-5,000	698 contacts →
	Indirect evidence “Somos Avatel Telecom, compañía de telecomunicaciones en España.” Source: RevenueBase Database · checked Sep 30, 2026
4	ONO	Indirect evidence	Pozuelo De Alarcón, SpainHQ checked Sep 30, 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 30, 2026
5	Adamo Telecom Iberia S.A.U	Indirect evidence	Barcelona, SpainHQ checked Sep 30, 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 30, 2026
6	Telxius	Indirect evidence	Madrid, SpainHQ checked Sep 30, 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 30, 2026
7	Lyntia	Partial evidence	Alcobendas, SpainHQ checked Sep 30, 2026	201-500	157 contacts →
	Partial 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 30, 2026
8	Cableworld	Indirect evidence	Alicante, SpainHQ checked Sep 30, 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 30, 2026
9	Cablescom	Indirect evidence	Zaragoza, SpainHQ checked Sep 30, 2026	201-500	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 30, 2026
10	Fibritel	Indirect evidence	Illescas, SpainHQ checked Sep 30, 2026	51-200	60 contacts →
	Indirect evidence “Somos la Fibra Óptica que te conecta desde la España rural” Source: RevenueBase Database · checked Sep 30, 2026
11	Netllar Telecom	Indirect evidence	Albal, SpainHQ checked Sep 30, 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 30, 2026
12	WIBER	Indirect evidence	Motril, SpainHQ checked Sep 30, 2026	51-200	51 contacts →
	Indirect evidence “Tarifa plana de calidad y buen servicio.” Source: RevenueBase Database · checked Sep 30, 2026
13	EMBOU	Indirect evidence	Zaragoza, SpainHQ checked Sep 30, 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 30, 2026
14	Lightmax SL	Indirect evidence	Irun, SpainHQ checked Sep 30, 2026	51-200	49 contacts →
	Indirect evidence “Lightmax SL empresa fundada en 2007 especializada en la fabricación y suministro de productos para redes pasivas de fibra óptica.” Source: RevenueBase Database · checked Sep 30, 2026
15	Silbö Telecom	Indirect evidence	Madrid, SpainHQ checked Sep 30, 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 30, 2026
16	Optral S.A	Partial evidence	Alcobendas, SpainHQ checked Sep 30, 2026	51-200	40 contacts →
	Partial evidence “OPTRAL is a Spanish leader company, founded in 1988, engaged in fibre optic cable design, manufacture and worldwide known companies in the Telecom, Oil & Gas, Industry and…” Source: RevenueBase Database · checked Sep 30, 2026
17	Fibranet Telecomunicaciones	Indirect evidence	Murcia, SpainHQ checked Sep 30, 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 30, 2026
18	Onivia	Indirect evidence	Pozuelo De Alarcón, SpainHQ checked Sep 30, 2026	11-50	30 contacts →
	Indirect evidence “Onivia es el operador mayorista de fibra óptica independiente y neutral, que está transformando el mercado de las telecomunicaciones en España.” Source: RevenueBase Database · checked Sep 30, 2026
19	7play	Indirect evidence	Las Rozas De Madrid, SpainHQ checked Sep 30, 2026	51-200	28 contacts →
	Indirect evidence “7Play es un operador de telecomunicaciones con alcance nacional, que nace de la mano de un experimentado equipo con una larga trayectoria en el sector telco y en la consolidación…” Source: RevenueBase Database · checked Sep 30, 2026
20	Bluevía	Indirect evidence	Madrid, SpainHQ checked Sep 30, 2026	51-200	26 contacts →
	Indirect evidence “Somos un operador de red que ofrece servicios mayoristas de acceso FTTH y otros servicios de conectividad sobre tecnología de fibra.” Source: RevenueBase Database · checked Sep 30, 2026
21	Connectivity	Indirect evidence	Barcelona, SpainHQ checked Sep 30, 2026	11-50	21 contacts →
	Indirect evidence “En Connectivity ofrecemos servicios de conectividad personalizados para empresas que quieren ofrecer servicios de telefonía e internet con su propia marca y para empresas que…” Source: RevenueBase Database · checked Sep 30, 2026
22	Fibercom SL	Indirect evidence	Zaragoza, SpainHQ checked Sep 30, 2026	11-50	17 contacts →
	Indirect evidence “Fibercom ofrece productos y servicios de Fibra óptica en el ámbito de las Telecomunicaciones, cubriendo la totalidad de actividades involucradas en el proceso: ingeniería de redes…” Source: RevenueBase Database · checked Sep 30, 2026
23	PC Mancha	Indirect evidence	Quintanar De La Orden, SpainHQ checked Sep 30, 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 30, 2026
24	Redi Ibérica DE Redes	Indirect evidence	Valencia, SpainHQ checked Sep 30, 2026	11-50	17 contacts →
	Indirect evidence “Comercializando bajo el nombre de REDI, IBÉRICA DE REDES es un operador TOTAL de comunicaciones de voz y datos, integramos y proporcionamos todas las modalidades de conectividad…” Source: RevenueBase Database · checked Sep 30, 2026
25	Onsicom Operador DE Telecomunicaciones	Indirect evidence	La Rinconada, SpainHQ checked Sep 30, 2026	51-200	16 contacts →
	Indirect evidence “Onsicom es una compañía de telecomunicaciones líder en Andalucía que ofrece servicios de internet de alta velocidad, telefonía fija y móvil y televisión a clientes residenciales y…” Source: RevenueBase Database · checked Sep 30, 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: fiber optic telecommunications 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 fiber optic telecommunications companies.
Partial evidence: Its own public description names part of fiber optic telecommunications companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name fiber optic telecommunications 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 265 fiber optic telecommunications companies based in Spain

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Fiber optic telecommunications companies based in Spain at a glance

As of Sep 30, 2026

7.9%Verified-email coverage

31.5Average contacts per company

11-50Median size (employees)

10.9%Largest-city concentration · Madrid

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

109

11-50

101

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 265 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 fiber optic telecommunications 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 “fiber optic telecommunications 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 fiber optic telecommunications 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 fiber optic telecommunications 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, 658 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 30, 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.

Fiber optic telecommunications companies by metro

Fiber optic telecommunications companies in Madrid29

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 fiber optic telecommunications 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 fiber optic telecommunications companies are there based in Spain?

RevenueBase identified 265 fiber optic telecommunications 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?

Digi Spain Telecom, headquartered in Madrid, tops this list with the largest team on record.

Which city has the most fiber optic telecommunications companies?

Madrid leads with 29 headquartered companies, followed by Murcia (13) and Barcelona (11).

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 658 verified decision-maker contacts tracked across these 265 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 30, 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.