Company lists · Data refreshed September 2026
Top 25 Fiber optic network builders based in the United Kingdom
RevenueBase identified 685 fiber optic network builders headquartered in the United Kingdom as of September 2026 and tracks 26,835 professional contacts across them, including 8,845 with verified work emails. London is the largest hub.
This list covers fiber optic network builders headquartered in the United Kingdom, 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 20, 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 fiber optic network builders based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 13,395 contacts → | ||||
Indirect evidence “We’re the people who make the net work.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,460 contacts → | ||||
Partial evidence “At CityFibre, we’re building a new, intelligent, open-access fibre network, purpose built for the data age.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,295 contacts → | ||||
Indirect evidence “Hyperoptic was founded in 2011 to shake up the broadband market, and we're proud to be forever in our customers' corner.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 1,053 contacts → | ||||
Indirect evidence “Established in 1985 to support the emerging UK cable television market, Kelly Group has diversified to meet the needs of our clients.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 519 contacts → | ||||
Partial evidence “WHP is one of the UK's leading suppliers of network infrastructure services.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 490 contacts → | ||||
Indirect evidence “Gigaclear is proud to be transforming digital connectivity in rural Britain.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 470 contacts → | ||||
Partial evidence “Indigo engineers a digital future by designing, deploying, and supporting digital infrastructure for network owners and operators.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 330 contacts → | ||||
Indirect evidence “With 40 years of experience, Emtelle's competitive strength lies in strong technological capabilities, in relentless research and development, and in people whose dedication and…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 273 contacts → | ||||
Indirect evidence “Magdalene provides comprehensive independent solutions which address the individual needs of our customers throughout the Telecommunications Industry.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 239 contacts → | ||||
Partial evidence “ITS designs, builds and operates gigabit-capable full fibre networks, delivering the digital infrastructure that powers modern Britain.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 158 contacts → | ||||
Partial evidence “Viberoptix delivers frontline services to fibre networks providers across the UK and Ireland.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 151 contacts → | ||||
Indirect evidence “Beacon Comms is the trading name of Beacon Communication Services Ltd.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 135 contacts → | ||||
Indirect evidence “Giving the UK a better choice for broadband.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 134 contacts → | ||||
Indirect evidence “CASS (Cabling and Splicing Services) is a services driven telecommunications specialist business.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 133 contacts → | ||||
Partial evidence “FullFibre Limited are currently building a wholesale fibre-only network to 1 million premises by 2025.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 124 contacts → | ||||
Partial evidence “As a UK fibre network provider, we believe that high-speed broadband should be available for everyone.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 93 contacts → | ||||
Indirect evidence “Providing high quality, dedicated telecom infrastructure services to Operators across the country.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 89 contacts → | ||||
Partial evidence “We connect people, technologies and locations, enabling service providers, OEM's and internet service providers to deploy, scale, support and maintain network infrastructure…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 79 contacts → | ||||
Indirect evidence “As a family run business for over 30 years, here at Rapid Response Telecoms we take great pride in our services being a tier 1 supplier to many prestigious Alt Nets.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 79 contacts → | ||||
Partial evidence “Providing World-class Communication Network and Security Infrastructure Solutions Novo Technologies is dedicated to projects excellence, Novo Technologies undertakes end to end…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 76 contacts → | ||||
Partial evidence “ISG Tech is a market-leading provider of services for the design, deployment and management of enterprise network connectivity with over 35 years of experience.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 74 contacts → | ||||
Indirect evidence “Installation Technology has over thirty years of experience in providing technical solutions in advanced communication systems.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 68 contacts → | ||||
Partial evidence “We're Lightning Fibre, a multi-award-winning, community-focused Full Fibre Hyperfast network operator and internet service provider based in the South East of England.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 68 contacts → | ||||
Partial evidence “Sitec Infrastructure Services is a dynamic, delivery-focussed company providing Mobile infrastructure ADC services and Fixed/Fibre E2E network delivery capabilities.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 65 contacts → | ||||
Indirect evidence “Building the fibre infrastructure to light up and digitise, towns, villages and cities across the South; enabling emerging technology to thrive within the Fourth Industrial…” Source: RevenueBase Database · checked Sep 20, 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: fiber optic network builders. 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 network builders.
- Partial evidence
- Its own public description names part of fiber optic network builders, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name fiber optic network builders. 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 685 fiber optic network builders based in the United Kingdom
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Fiber optic network builders based in the United Kingdom at a glance
As of Sep 20, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 685 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 network builders, 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 the United Kingdom whose own description of what they do matches “fiber optic network builders”. 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 network builders), 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 network builders, and records with no verified work email. Companies headquartered outside United Kingdom 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, 8,845 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 20, 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 network builders by metro
- Fiber optic network builders in London73
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 network builders, 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 network builders are there based in the United Kingdom?
RevenueBase identified 685 fiber optic network builders headquartered in the United Kingdom 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?
Openreach, headquartered in London, tops this list with the largest team on record.
Which city has the most fiber optic network builders?
London leads with 73 headquartered companies, followed by Bristol (15) and Birmingham (14).
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 8,845 verified decision-maker contacts tracked across these 685 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 20, 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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