Company lists · Data refreshed September 2026

Top 25 Enterprise network security companies based in the United Kingdom

Name: Enterprise network security 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 28, 2026 139 companies tracked

RevenueBase identified 139 enterprise network security companies headquartered in the United Kingdom as of September 2026 and tracks 1,684 professional contacts across them, including 719 with verified work emails. London is the largest hub.

This list covers enterprise network security 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 28, 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 28, 2026 86% judged on-target in blind review

139Companies

1,684Contacts tracked

719Verified emails

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The 25 largest enterprise network security companies based in the United Kingdom

Ranked by team size

Top 25 of 139 enterprise network security companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to enterprise network security 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	Quorum Cyber	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 28, 2026	201-500	297 contacts →
	Indirect evidence “At Quorum Cyber, we're on a mission to help good people win.” Source: RevenueBase Database · checked Sep 28, 2026
2	Khipu Networks	Strong evidence	Fleet, United KingdomHQ checked Sep 28, 2026	51-200	125 contacts →
	Strong evidence “KHIPU Networks is an award winning international Cyber Security Company delivering a wide range of network, wireless and security solutions, technologies and services across…” Source: RevenueBase Database · checked Sep 28, 2026
3	Total Security Protection LTD	Strong evidence	Watford, United KingdomHQ checked Sep 28, 2026	51-200	116 contacts →
	Strong evidence “TSP has a reputation for providing enterprise security solutions, as well as excellent system integration standards and exceptional aftercare support, since its founding in 1988.” Source: RevenueBase Database · checked Sep 28, 2026
4	Sep2	Partial evidence	Leeds, United KingdomHQ checked Sep 28, 2026	51-200	95 contacts →
	Partial evidence “SEP2 is an award-winning UK-based cyber security specialist service provider, powered by a dedicated team of experts available 24/7/365.” Source: RevenueBase Database · checked Sep 28, 2026
5	Becrypt	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	68 contacts →
	Partial 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 28, 2026
6	Talk Straight Group	Strong evidence	Ilkley, United KingdomHQ checked Sep 28, 2026	11-50	62 contacts →
	Strong evidence “Talk Straight has been looking after the communications and network security for thousands of public and private sector organisations since 2007.” Source: RevenueBase Database · checked Sep 28, 2026
7	Garrison NOW A Part Of Everfox	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	60 contacts →
	Indirect 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 28, 2026
8	Specialist Network Operations	Strong evidence	Oswestry, United KingdomHQ checked Sep 28, 2026	51-200	54 contacts →
	Strong evidence “SNO is a specialist network operations and security partner, helping organisations design, secure, and manage the networks they rely on every day.” Source: RevenueBase Database · checked Sep 28, 2026
9	Borwood	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	43 contacts →
	Indirect evidence “At Borwood, we believe that seamless, always-on communication is the foundation of global business success.” Source: RevenueBase Database · checked Sep 28, 2026
10	Coretech Security	Partial evidence	Cheltenham, United KingdomHQ checked Sep 28, 2026	51-200	42 contacts →
	Partial evidence “CoreTech is a specialist cyber security company whose people are motivated by the desire to deliver exceptional capabilities coupled with a real sense of mission.” Source: RevenueBase Database · checked Sep 28, 2026
11	Omerta	Partial evidence	Saffron Walden, United KingdomHQ checked Sep 28, 2026	51-200	38 contacts →
	Partial evidence “Omerta - A Global Security Technology and Services Company.” Source: RevenueBase Database · checked Sep 28, 2026
12	Nanjgel Solutions	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	24 contacts →
	Partial evidence “Nanjgel Solutions is focused on delivering the best IT security for businesses.” Source: RevenueBase Database · checked Sep 28, 2026
13	4secure LTD	Partial evidence	Northampton, United KingdomHQ checked Sep 28, 2026	11-50	23 contacts →
	Partial evidence “4Secure is a trusted provider of software defined, cross-network/cross-domain cybersecurity solutions for commercial, government and defence.” Source: RevenueBase Database · checked Sep 28, 2026
14	Protos Networks	Strong evidence	Chester, United KingdomHQ checked Sep 28, 2026	11-50	22 contacts →
	Strong evidence “Protos Networks is an award-winning network and cyber security services specialist based in the North West of England.” Source: RevenueBase Database · checked Sep 28, 2026
15	Blackdice Cyber	Partial evidence	Leeds, United KingdomHQ checked Sep 28, 2026	11-50	17 contacts →
	Partial evidence “BlackDice Cyber helps telcos turn their networks into platforms of trust.” Source: RevenueBase Database · checked Sep 28, 2026
16	Cyberhive	Indirect evidence	Newbury, United KingdomHQ checked Sep 28, 2026	11-50	16 contacts →
	Indirect evidence “CyberHive protects the most valued organisations, their people data, and assets, with patented technology that is simple, secure and performant.” Source: RevenueBase Database · checked Sep 28, 2026
17	Tranchulas	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	15 contacts →
	Partial 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 28, 2026
18	vdc.cloud	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	12 contacts →
	Strong evidence “Our mission is to provide business customers with effective cloud network security solutions that enhance productivity, eliminate silos, reduce costs, and achieve digital…” Source: RevenueBase Database · checked Sep 28, 2026
19	EMPSN	Indirect evidence	Blisworth, United KingdomHQ checked Sep 28, 2026	1-10	10 contacts →
	Indirect evidence “emPSN provide secure connections for the public good across the East Midlands and beyond.” Source: RevenueBase Database · checked Sep 28, 2026
20	PC Power International LTD	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	10 contacts →
	Strong evidence “PC POWER INTERNATIONAL LTD is a computer & network security company based in the City, London, United Kingdom.” Source: RevenueBase Database · checked Sep 28, 2026
21	Defenx	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	10 contacts →
	Partial evidence “Defenx is an IT company that has an extensive background in providing businesses with cloud based security solutions and support for their digital infrastructure.” Source: RevenueBase Database · checked Sep 28, 2026
22	Security Software Solutions LTD	Strong evidence	Marlow Bucks, United KingdomHQ checked Sep 28, 2026	1-10	9 contacts →
	Strong evidence “Formed in 2010, Security Software Solutions Ltd (S3 Ltd) has become a recognised force in Enterprise Security Solutions in Europe.” Source: RevenueBase Database · checked Sep 28, 2026
23	Netaccess LTD	Indirect evidence	Flitton, United KingdomHQ checked Sep 28, 2026	11-50	8 contacts →
	Indirect evidence “Design Philosophy The netaccess core design philosophy has always been to develop systems that support customer processes, ensure our products work for the user and reduce, as far…” Source: RevenueBase Database · checked Sep 28, 2026
24	Hytec Information Security, A Civica Company	Partial evidence	Teddington, United KingdomHQ checked Sep 28, 2026	11-50	8 contacts →
	Partial evidence “With over 40 years of information security experience, Hytec, a Civica company, is a trusted partner for organisations looking for expert, specialised cyber security protection.” Source: RevenueBase Database · checked Sep 28, 2026
25	DSC	Strong evidence	Crowthorne, United KingdomHQ checked Sep 28, 2026	1-10	8 contacts →
	Strong evidence “We help businesses of all sizes with Cyber Security and Network Infrastructure projects, we aim to deliver the best solutions tailored to your unique business challenges.” Source: RevenueBase Database · checked Sep 28, 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: enterprise network security 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 enterprise network security companies.
Partial evidence: Its own public description names part of enterprise network security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name enterprise network security 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 139 enterprise network security companies based in the United Kingdom

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Enterprise network security companies based in the United Kingdom at a glance

As of Sep 28, 2026

42.7%Verified-email coverage

12.1Average contacts per company

1-10Median size (employees)

32.4%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

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 139 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 enterprise network security 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 “enterprise network security 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 enterprise network security 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 enterprise network security 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, 719 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 28, 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.

Enterprise network security companies by metro

Enterprise network security companies in London45

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 enterprise network security 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 enterprise network security companies are there based in the United Kingdom?

RevenueBase identified 139 enterprise network security 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?

Quorum Cyber, headquartered in Edinburgh, tops this list with the largest team on record.

Which city has the most enterprise network security companies?

London leads with 45 headquartered companies, followed by Manchester (6) 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 719 verified decision-maker contacts tracked across these 139 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 28, 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.