Company lists · Data refreshed September 2026

Top 23 Telecom cybersecurity software companies based in London, United Kingdom

Name: Telecom cybersecurity software companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 64 companies tracked

RevenueBase identified 64 telecom cybersecurity software companies headquartered in London, United Kingdom as of September 2026 and tracks 1,329 professional contacts across them, including 177 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers telecom cybersecurity software companies headquartered in London, 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 29, 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 29, 2026 86% judged on-target in blind review

64Companies

1,329Contacts tracked

177Verified emails

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The 23 largest telecom cybersecurity software companies based in London, United Kingdom

Ranked by team size

Top 23 of 64 telecom cybersecurity software companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to telecom cybersecurity software 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	Titania LTD	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	88 contacts →
	Indirect evidence “Dedicated to securing the networks society depends on.” Source: RevenueBase Database · checked Sep 29, 2026
2	Becrypt	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	68 contacts →
	Strong evidence “With a heritage of creating National Cyber Security Centre certified products, Becrypt, a Leonardo company, is a trusted provider of endpoint cybersecurity software solutions.” Source: RevenueBase Database · checked Sep 29, 2026
3	Techforing	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	61 contacts →
	Partial evidence “TechForing is a global leader in cybersecurity, dedicated to protecting digital assets and ensuring a safer cyberspace for businesses and individuals.” Source: RevenueBase Database · checked Sep 29, 2026
4	Garrison NOW A Part Of Everfox	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	60 contacts →
	Partial evidence “Garrison is a London-based cybersecurity company founded in 2014 by David Garfield (CEO) and Henry Harrison (Chief Scientist).” Source: RevenueBase Database · checked Sep 29, 2026
5	Torrid Networks Limited	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	32 contacts →
	Indirect evidence “Founded in 2006, Torrid Networks has been able to establish strong credentials in the area of cyber security products, research, consulting, managed services, education and staff…” Source: RevenueBase Database · checked Sep 29, 2026
6	Cyb3r	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	32 contacts →
	Indirect evidence “CYB3R Group, is a leading provider of comprehensive Cyber Security, IT and Communications Solutions.” Source: RevenueBase Database · checked Sep 29, 2026
7	Encode	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	25 contacts →
	Indirect evidence “Encode is now part of Obrela Security Industries collectively delivering cutting edge Cyber Security Services, empowering organizations to better protect against cyber threats.” Source: RevenueBase Database · checked Sep 29, 2026
8	Cyberrey	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	18 contacts →
	Partial evidence “Your Trusted Distribution & Security Solutions in Building and Securing Your Digital Ecosystem Cyberrey is a leading distributor of comprehensive cybersecurity solutions…” Source: RevenueBase Database · checked Sep 29, 2026
9	Sinevis	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	17 contacts →
	Partial evidence “We are a leading cybersecurity services organization with more than a decade of proven expertise in consulting, solution implementation and managed services.” Source: RevenueBase Database · checked Sep 29, 2026
10	CST Limited Computer Security Technology	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	17 contacts →
	Indirect evidence “We are a London based specialist supplier of cyber defence solution and information security services.” Source: RevenueBase Database · checked Sep 29, 2026
11	Tranchulas	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	15 contacts →
	Indirect evidence “Founded in 2006, Tranchulas is a multinational cyber security company having its offices in London, San Francisco, Budapest and Islamabad.” Source: RevenueBase Database · checked Sep 29, 2026
12	Disclosure Cybersecurity	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	11 contacts →
	Partial evidence “Disclosure Cybersecurity Ltd is a specialist cyber security company, formed by professionals with extensive experience and wide exposure in the cyber security market.” Source: RevenueBase Database · checked Sep 29, 2026
13	PC Power International LTD	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	10 contacts →
	Indirect evidence “PC POWER INTERNATIONAL LTD is a computer & network security company based in the City, London, United Kingdom.” Source: RevenueBase Database · checked Sep 29, 2026
14	Qrispy	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	1-10	8 contacts →
	Partial evidence “At Qrispy, our mission is to revolutionize the communication and telecommunications industry with innovative and secure solutions.” Source: RevenueBase Database · checked Sep 29, 2026
15	Cyber Sentinel	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	1-10	8 contacts →
	Partial evidence “Cyber Sentinel is a curated cybersecurity marketplace for medium-sized businesses.” Source: RevenueBase Database · checked Sep 29, 2026
16	Ultra Horizon	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	1-10	4 contacts →
	Indirect evidence “Ultra Horizon Ltd is a cyber security company comprised of computer scientists who design bespoke security solutions for the maritime and defence sector.” Source: RevenueBase Database · checked Sep 29, 2026
17	Cell Guard Technologies	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	2 contacts →
	Indirect evidence “Cell Guard is a secure communications company based in London and Warsaw manufacturing encrypted smartphones and developers of various IP registered secure smartphone applications…” Source: RevenueBase Database · checked Sep 29, 2026
18	Cansol Consulting	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	2 contacts →
	Indirect evidence “Founded in 2017, Cansol is a Cyber Security company with office in London and Dubai.” Source: RevenueBase Database · checked Sep 29, 2026
19	Essential Security UK LTD	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	1-10	2 contacts →
	Indirect evidence “Essential Security is a unique company in that we offer a specialised and confidential service meeting your bespoke technological and communications requirements.” Source: RevenueBase Database · checked Sep 29, 2026
20	Bema Cyber Tech LTD	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	1-10	2 contacts →
	Indirect evidence “BeMa Cyber Tech (BCT) is committed to providing excellent Cyber Security Services.” Source: RevenueBase Database · checked Sep 29, 2026
21	soc.os	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	1 contacts →
	Indirect evidence “SOC.OS has joined the Sophos family!” Source: RevenueBase Database · checked Sep 29, 2026
22	Secunity Group	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	1 contacts →
	Indirect evidence “Managed Cyber Security Services” Source: RevenueBase Database · checked Sep 29, 2026
23	Alion4	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	1-10	1 contacts →
	Indirect evidence “Alion4 is a leading provider of holistic enterprise-level IT security solutions.” Source: RevenueBase Database · checked Sep 29, 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 cybersecurity software 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 cybersecurity software companies.
Partial evidence: Its own public description names part of telecom cybersecurity software companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name telecom cybersecurity software 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 23 of 64 telecom cybersecurity software companies based in London, United Kingdom

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Telecom cybersecurity software companies based in London, United Kingdom at a glance

As of Sep 29, 2026

13.3%Verified-email coverage

20.8Average contacts per company

11-50Median size (employees)

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 64 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 cybersecurity software 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 London, United Kingdom whose own description of what they do matches “telecom cybersecurity software 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 cybersecurity software 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 cybersecurity software companies, and records with no verified work email. Companies headquartered outside London 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, 177 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 29, 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 telecom cybersecurity software 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 cybersecurity software companies are there based in London, United Kingdom?

RevenueBase identified 64 telecom cybersecurity software companies headquartered in London, 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?

Titania LTD, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most telecom cybersecurity software companies?

London leads the United Kingdom with 64 headquartered companies, followed by Manchester (8) and Northampton (3).

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 177 verified decision-maker contacts tracked across these 64 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 29, 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.