Company lists · Data refreshed September 2026

Top 25 Telecom infrastructure companies based in the United Kingdom

Name: Telecom infrastructure companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 684 companies tracked

RevenueBase identified 684 telecom infrastructure companies headquartered in the United Kingdom as of September 2026 and tracks 27,199 professional contacts across them, including 10,516 with verified work emails. London is the largest hub.

This list covers telecom infrastructure companies 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 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 16, 2026 86% judged on-target in blind review

684Companies

27,199Contacts tracked

10,516Verified emails

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The 25 largest telecom infrastructure companies based in the United Kingdom

Ranked by team size

Top 25 of 684 telecom infrastructure companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to telecom infrastructure 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	Colt Technology Services	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	5,001-10,000	6,233 contacts →
	Partial evidence “Colt Technology Services (Colt) is a global digital infrastructure company which creates extraordinary connections to help businesses succeed.” Source: RevenueBase Database · checked Sep 16, 2026
2	IHS Towers	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	3,242 contacts →
	Partial evidence “IHS Towers is one of the largest independent owners, operators and developers of shared communications infrastructure in the world by tower count and is solely focused on the…” Source: RevenueBase Database · checked Sep 16, 2026
3	Telent Technology Services LTD	Partial evidence	Warwick, United KingdomHQ checked Sep 16, 2026	1,001-5,000	2,407 contacts →
	Partial evidence “Telent designs, builds, manages, and maintains the nation’s critical infrastructure technology that keeps the country moving, connected, and safe.” Source: RevenueBase Database · checked Sep 16, 2026
4	Kelly Group	Indirect evidence	Wembley, United KingdomHQ checked Sep 16, 2026	1,001-5,000	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 16, 2026
5	Helios Towers	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	501-1,000	784 contacts →
	Partial evidence “Helios Towers is a leading independent telecom tower company connecting people and powering growth across Africa and the Middle East.” Source: RevenueBase Database · checked Sep 16, 2026
6	WHP Telecoms Limited	Partial evidence	Warrington, United KingdomHQ checked Sep 16, 2026	501-1,000	519 contacts →
	Partial evidence “WHP is one of the UK's leading suppliers of network infrastructure services.” Source: RevenueBase Database · checked Sep 16, 2026
7	Indigo	Partial evidence	Magor, United KingdomHQ checked Sep 16, 2026	201-500	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 16, 2026
8	EXA Infrastructure	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	416 contacts →
	Partial evidence “EXA Infrastructure is an award-winning portfolio company of I Squared Capital and one of the largest dedicated digital infrastructure platforms throughout Europe, connecting North…” Source: RevenueBase Database · checked Sep 16, 2026
9	Comex 2000	Partial evidence	Derby, United KingdomHQ checked Sep 16, 2026	501-1,000	367 contacts →
	Partial evidence “Comex is an established major strategic partner of choice within the telecommunication sector, across the United Kingdom and Ireland, offering an end to end solution.” Source: RevenueBase Database · checked Sep 16, 2026
10	Morrison Telecom Services	Strong evidence	Stevenage, United KingdomHQ checked Sep 16, 2026	501-1,000	339 contacts →
	Strong evidence “Morrison Telecom Services is focused on the design, build and maintenance of telecom infrastructure for key clients in the fixed telecom market.” Source: RevenueBase Database · checked Sep 16, 2026
11	Clarke Telecom	Strong evidence	Manchester, United KingdomHQ checked Sep 16, 2026	201-500	312 contacts →
	Strong evidence “Clarke Telecom carries out every aspect of wireless telecoms network infrastructure delivery.” Source: RevenueBase Database · checked Sep 16, 2026
12	Cornerstone	Partial evidence	Theale, United KingdomHQ checked Sep 16, 2026	201-500	300 contacts →
	Partial evidence “Welcome to Cornerstone, the leading UK mobile infrastructure services company.” Source: RevenueBase Database · checked Sep 16, 2026
13	MAP Group UK	Indirect evidence	Middlesbrough, United KingdomHQ checked Sep 16, 2026	201-500	275 contacts →
	Indirect evidence “Map Group (UK) is one of the leading independent providers of professional technology services to the UK communications sector.” Source: RevenueBase Database · checked Sep 16, 2026
14	Magdalene	Partial evidence	St Ives, United KingdomHQ checked Sep 16, 2026	201-500	273 contacts →
	Partial evidence “Magdalene provides comprehensive independent solutions which address the individual needs of our customers throughout the Telecommunications Industry.” Source: RevenueBase Database · checked Sep 16, 2026
15	Telecom Infrastructure Partners TIP	Partial evidence	Shrewsbury, United KingdomHQ checked Sep 16, 2026	201-500	237 contacts →
	Partial evidence “Telecom IP helps landowners, property owners, businesses and investors unlock the value of their telecom assets.” Source: RevenueBase Database · checked Sep 16, 2026
16	John Henry Group	Indirect evidence	Cambridge, United KingdomHQ checked Sep 16, 2026	201-500	223 contacts →
	Indirect evidence “Founded in 1985, John Henry Group is a leading, national independent integrated services provider providing best in class expertise, enabling our partner clients to deliver…” Source: RevenueBase Database · checked Sep 16, 2026
17	Technetix	Partial evidence	Albourne, United KingdomHQ checked Sep 16, 2026	51-200	190 contacts →
	Partial evidence “Technetix provides critical broadband infrastructure for network operators globally.” Source: RevenueBase Database · checked Sep 16, 2026
18	Viberoptix	Indirect evidence	Coalisland, United KingdomHQ checked Sep 16, 2026	501-1,000	158 contacts →
	Indirect evidence “Viberoptix delivers frontline services to fibre networks providers across the UK and Ireland.” Source: RevenueBase Database · checked Sep 16, 2026
19	Beacon Comms	Indirect evidence	Tavistock, United KingdomHQ checked Sep 16, 2026	201-500	151 contacts →
	Indirect evidence “Beacon Comms is the trading name of Beacon Communication Services Ltd.” Source: RevenueBase Database · checked Sep 16, 2026
20	Freshwave	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	134 contacts →
	Indirect evidence “The networks of the future are here.” Source: RevenueBase Database · checked Sep 16, 2026
21	Cass Worldwide	Partial evidence	Snitterfield, United KingdomHQ checked Sep 16, 2026	201-500	134 contacts →
	Partial evidence “CASS (Cabling and Splicing Services) is a services driven telecommunications specialist business.” Source: RevenueBase Database · checked Sep 16, 2026
22	Genesis Technology Services Limited	Indirect evidence	Peterborough, United KingdomHQ checked Sep 16, 2026	501-1,000	132 contacts →
	Indirect evidence “Genesis Technology Services Limited (GTS Ltd) is a leading engineering service provider in the UK and a global multinational corporation, based in Cambridgeshire, UK.” Source: RevenueBase Database · checked Sep 16, 2026
23	Swann Engineering Group LTD	Indirect evidence	Braintree, United KingdomHQ checked Sep 16, 2026	51-200	123 contacts →
	Indirect evidence “About Swann Engineering Group Founded in 1974, Swann Engineering Group specializes in delivering turnkey solutions for complex engineering challenges.” Source: RevenueBase Database · checked Sep 16, 2026
24	Waldon Telecom	Strong evidence	West Byfleet, United KingdomHQ checked Sep 16, 2026	51-200	93 contacts →
	Strong evidence “Providing high quality, dedicated telecom infrastructure services to Operators across the country.” Source: RevenueBase Database · checked Sep 16, 2026
25	Linbrooke Services LTD	Partial evidence	Sheffield, United KingdomHQ checked Sep 16, 2026	201-500	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 16, 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: telecom 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 telecom infrastructure companies.
Partial evidence: Its own public description names part of telecom infrastructure companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name telecom 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 684 telecom infrastructure companies based in the United Kingdom

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Telecom infrastructure companies based in the United Kingdom at a glance

As of Sep 16, 2026

38.7%Verified-email coverage

39.8Average contacts per company

11-50Median size (employees)

14.6%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

265

11-50

252

51-200

113

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 United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 684 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 telecom 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 the United Kingdom whose own description of what they do matches “telecom 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 telecom 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 telecom infrastructure companies, 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, 10,516 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.

Telecom infrastructure companies by metro

Telecom infrastructure companies in London100

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 telecom 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 telecom infrastructure companies are there based in the United Kingdom?

RevenueBase identified 684 telecom infrastructure companies 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?

Colt Technology Services, headquartered in London, tops this list with the largest team on record.

Which city has the most telecom infrastructure companies?

London leads with 100 headquartered companies, followed by Birmingham (15) and Glasgow (13).

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 10,516 verified decision-maker contacts tracked across these 684 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.