Company lists · Data refreshed September 2026

Top 25 Software security companies based in the United Kingdom

Name: Software 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 21, 2026 186 companies tracked

RevenueBase identified 186 software security companies headquartered in the United Kingdom as of September 2026 and tracks 7,553 professional contacts across them, including 3,741 with verified work emails. London is the largest hub.

This list covers software 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 21, 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 21, 2026 86% judged on-target in blind review

186Companies

7,553Contacts tracked

3,741Verified emails

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The 25 largest software security companies based in the United Kingdom

Ranked by team size

Top 25 of 186 software security companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to software 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	Sophos	Indirect evidence	Abingdon, United KingdomHQ checked Sep 21, 2026	5,001-10,000	4,925 contacts →
	Indirect evidence “Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Source: RevenueBase Database · checked Sep 21, 2026
2	Securityhq	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	502 contacts →
	Partial evidence “SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.” Source: RevenueBase Database · checked Sep 21, 2026
3	Quorum Cyber	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 21, 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 21, 2026
4	Portswigger	Strong evidence	Knutsford, United KingdomHQ checked Sep 21, 2026	51-200	267 contacts →
	Strong evidence “PortSwigger is a global leader in the creation of software tools for security testing of web applications.” Source: RevenueBase Database · checked Sep 21, 2026
5	Khipu Networks	Partial evidence	Fleet, United KingdomHQ checked Sep 21, 2026	51-200	125 contacts →
	Partial 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 21, 2026
6	Titania LTD	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	88 contacts →
	Partial evidence “Dedicated to securing the networks society depends on.” Source: RevenueBase Database · checked Sep 21, 2026
7	Becrypt	Strong evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
8	Eset UK	Indirect evidence	Bournemouth, United KingdomHQ checked Sep 21, 2026	51-200	66 contacts →
	Indirect evidence “We help businesses and individuals stay protected in an increasingly complex digital world.” Source: RevenueBase Database · checked Sep 21, 2026
9	Techforing	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	61 contacts →
	Indirect 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 21, 2026
10	Adarma Security	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 21, 2026	201-500	51 contacts →
	Indirect evidence “We are Adarma, independent leaders in detection and response services.” Source: RevenueBase Database · checked Sep 21, 2026
11	Coretech Security	Partial evidence	Cheltenham, United KingdomHQ checked Sep 21, 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 21, 2026
12	Omerta	Partial evidence	Saffron Walden, United KingdomHQ checked Sep 21, 2026	51-200	38 contacts →
	Partial evidence “Omerta - A Global Security Technology and Services Company.” Source: RevenueBase Database · checked Sep 21, 2026
13	defense.com	Partial evidence	Stevenage, United KingdomHQ checked Sep 21, 2026	51-200	32 contacts →
	Partial evidence “Defense.com is transforming the way businesses manage cyber security by allowing them to easily identify, prioritise and remediate threats.” Source: RevenueBase Database · checked Sep 21, 2026
14	Intrinsic Security	Partial evidence	Peterborough, United KingdomHQ checked Sep 21, 2026	51-200	32 contacts →
	Partial evidence “Intrinsic Security is a UK-headquartered cybersecurity firm delivering 24/7 threat detection, incident response, and resilience across cloud, hybrid, OT, IoT, and identity…” Source: RevenueBase Database · checked Sep 21, 2026
15	Encode	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	25 contacts →
	Partial 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 21, 2026
16	Nanjgel Solutions	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	24 contacts →
	Partial evidence “Nanjgel Solutions is focused on delivering the best IT security for businesses.” Source: RevenueBase Database · checked Sep 21, 2026
17	4secure LTD	Partial evidence	Northampton, United KingdomHQ checked Sep 21, 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 21, 2026
18	Blue Cube Security LTD	Partial evidence	East Grinstead, United KingdomHQ checked Sep 21, 2026	11-50	22 contacts →
	Partial evidence “Blue Cube Security is a trusted UK cyber security partner with over 25 years of experience helping organisations stay secure in an increasingly complex digital world.” Source: RevenueBase Database · checked Sep 21, 2026
19	Clearswift	Indirect evidence	Berkshire, United KingdomHQ checked Sep 21, 2026	201-500	19 contacts →
	Indirect evidence “Why Clearswift?” Source: RevenueBase Database · checked Sep 21, 2026
20	Trustify LTD	Partial evidence	Edinburgh, United KingdomHQ checked Sep 21, 2026	11-50	18 contacts →
	Partial evidence “Trustify is a Cybersecurity software vendor based in Edinburgh, Scotland.” Source: RevenueBase Database · checked Sep 21, 2026
21	Cyberrey	Partial evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
22	Sinevis	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	17 contacts →
	Indirect 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 21, 2026
23	CST Limited Computer Security Technology	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	17 contacts →
	Partial evidence “We are a London based specialist supplier of cyber defence solution and information security services.” Source: RevenueBase Database · checked Sep 21, 2026
24	Cyberhive	Indirect evidence	Newbury, United KingdomHQ checked Sep 21, 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 21, 2026
25	OPTEC	Indirect evidence	Towcester, United KingdomHQ checked Sep 21, 2026	1-10	16 contacts →
	Indirect evidence “We specialise in delivering end-to-end cybersecurity solutions and services designed to proactively protect your business.” Source: RevenueBase Database · checked Sep 21, 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: software 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 software security companies.
Partial evidence: Its own public description names part of software security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name software 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 186 software security companies based in the United Kingdom

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Software security companies based in the United Kingdom at a glance

As of Sep 21, 2026

49.5%Verified-email coverage

40.6Average contacts per company

1-10Median size (employees)

38.7%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

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 186 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 software 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 “software 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 software 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 software 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, 3,741 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 21, 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.

Software security companies by metro

Software security companies in London72

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 software 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 software security companies are there based in the United Kingdom?

RevenueBase identified 186 software 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?

Sophos, headquartered in Abingdon, tops this list with the largest team on record.

Which city has the most software security companies?

London leads with 72 headquartered companies, followed by Manchester (7) and Edinburgh (5).

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 3,741 verified decision-maker contacts tracked across these 186 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 21, 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.