Company lists · Data refreshed September 2026
Top 25 Cybersecurity firms based in the United Kingdom
RevenueBase identified 2,100 company matches for cybersecurity firms associated with the United Kingdom as of September 2026 and tracks 40,405 professional contacts across them, including 16,845 with verified work emails and 5,377 with mobile numbers. London is the largest hub.
This list covers company matches for cybersecurity firms associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 1, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 cybersecurity firms based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 4,963 contacts → | ||||
Exact match “Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 2 | 3,059 contacts → | ||||
Exact match “SailPoint equips the modern enterprise to seamlessly manage and secure access to applications and data through the lens of identity – at speed and scale.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 3 | 2,590 contacts → | ||||
Exact match “Darktrace is a global leader in AI cybersecurity, providing the essential cybersecurity platform to secure organizations today and for an ever-changing future.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 4 | 1,946 contacts → | ||||
Exact match “Hack The Box is the leading AI-powered cybersecurity readiness and upskilling platform, trusted by 1,500+ organizations worldwide, including Fortune 500 enterprises, government…” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 5 | 894 contacts → | ||||
Exact match “ZeroFox is the solution to discover, validate, and disrupt external cyber threats before they harm revenue or reputation.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 6 | 739 contacts → | ||||
Exact match “SISA is a global forensics-driven cybersecurity solutions company, trusted by leading organizations for securing their businesses with robust preventive, detective, and corrective…” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 7 | 729 contacts → | ||||
Exact match “Claroty has redefined cyber-physical systems (CPS) protection with an unrivaled industry-centric platform built to secure mission-critical infrastructure.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 8 | 684 contacts → | ||||
Exact match “At Roke, we stand at the forefront of defence and security, delivering cutting-edge intelligence and engineering solutions that protect nations, troops, borders, and businesses.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 9 | 635 contacts → | ||||
Exact match “Everfox delivers trusted connectivity to protect the world's most critical environments, safeguarding the sensitive information behind decision advantage.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 10 | 633 contacts → | ||||
Exact match “MASS, part of the Cohort plc group, helps you realise the value of your data.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 11 | 614 contacts → | ||||
Exact match “WithSecure™ is Europe's cybersecurity partner of choice.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 12 | 546 contacts → | ||||
Exact match “Yubico (Nasdaq Stockholm: YUBICO) is a modern cybersecurity company on a mission to make the digital world safer for everyone.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 13 | 429 contacts → | ||||
Exact match “BioCatch prevents financial crime by recognizing patterns in human behavior.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 14 | 341 contacts → | ||||
Exact match “Integrity360 is a leading independent cyber security and PCI specialist operating across EMEA and North America, with offices spanning the UK and Ireland, Bulgaria, Italy, Sweden…” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 15 | 304 contacts → | ||||
Exact match “Bridewell is the trusted cyber security partner for organisations operating within Critical National Infrastructure (CNI), as well as companies who want the highest standard of…” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 16 | 292 contacts → | ||||
Exact match “At Quorum Cyber, we're on a mission to help good people win.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 17 | 207 contacts → | ||||
Exact match “At VIPRE Security, our mission is to help humanity prosper by creating a high level of trust that enables digital safety for all.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 18 | 206 contacts → | ||||
Exact match “Netcraft provides powerful phishing detection, cybercrime disruption and website takedown solutions to the world's largest organizations” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 19 | 201 contacts → | ||||
Exact match “The Redesign Group is a global technology and cybersecurity consulting firm leveraging design thinking, interdependent subject matter expertise, and emerging technology solutions…” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 20 | 188 contacts → | ||||
Exact match “Intragen is a cyber security business focused on managed Identity solutions and services.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 21 | 168 contacts → | ||||
Exact match “Exclusive Networks is a global trusted cybersecurity specialist for digital infrastructure helping to drive the transition to a totally trusted digital future for all people and…” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 22 | 142 contacts → | ||||
Exact match “Logiq is a UK-based cyber security consultancy and secure managed services provider supporting defence, government, and critical national infrastructure (CNI) organisations where…” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 23 | 141 contacts → | ||||
Exact match “CyberSec Consulting, headquartered in the UAE and serving the iMETA market, is a distinguished professional Cyber Security and Consulting services company.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 24 | 135 contacts → | ||||
Exact match “At Cipher, we're redefining digital security as the premier cybersecurity leader in the Middle East.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
| 25 | 123 contacts → | ||||
Exact match “Our mission is to eliminate the most complex cybersecurity challenge every organization faces: insider risk.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “cybersecurity firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 25 of 2,100 cybersecurity firms based in the United Kingdom
See the full list, filter by size, metro and specialty, and access 16,845 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Cybersecurity firms based in the United Kingdom at a glance
As of Sep 1, 2026Companies by employee count
How this list was built
The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Company records associated with the United Kingdom whose business descriptions match “cybersecurity firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
- RevenueBase SmartSearch
- Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
- Public preview
- The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
- Match quality
- RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
- 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 displayed company carries at least one verified work email. RevenueBase tracks 16,845 professional contacts with verified work emails across the full matched dataset. 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 1, 2026. Lists refresh periodically as the graph is re-checked.
- Record context
- Company records and descriptions can change. Check the company's website for its current services and locations.
Cybersecurity firms by metro
Frequently asked
What is RevenueBase SmartSearch?
RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “cybersecurity firms”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many cybersecurity firms are there based in the United Kingdom?
RevenueBase identified 2,100 company matches for cybersecurity firms associated with the United Kingdom as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.
What is the largest company on this list?
Sophos tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which city has the most cybersecurity firms?
London leads with 891 company records, followed by Manchester (74) and Birmingham (36).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 16,845 professional contacts with verified work emails tracked across these 2,100 companies; direct dials are available where recorded.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 1, 2026.
Ready to reach these companies? Verified emails and direct dials for all 2,100 cybersecurity firms based in the United Kingdom. Start with a free account, no credit card.
Download this list →Related lists
Cybersecurity firms by geography
- Cybersecurity firms based in the United States
- Cybersecurity firms based in France
- Cybersecurity firms based in Canada
- Cybersecurity firms based in Brazil
- Cybersecurity firms based in Australia
- Cybersecurity firms based in Germany
- Cybersecurity firms based in Spain
- Cybersecurity firms based in the Netherlands
- Cybersecurity firms based in Italy
- Cybersecurity firms based in Israel
- Cybersecurity firms based in Mexico
- Cybersecurity firms based in South Africa
Browse the directory
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 SmartSearch, 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.
More company lists
Company intelligence · public preview
Top 25 cybersecurity firms based in the United Kingdom
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 2,100 matching company records for cybersecurity firms based in the United Kingdom, with 40,405 tracked contacts and 16,845 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 1, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 cybersecurity firms based in the United Kingdom
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  Sophossophos.comHQ: HQ not recorded; location: Abingdon, United KingdomReported employees: 5,001-10,000 | HQ not recorded; location: Abingdon, United Kingdom | 5,001-10,000 | Exact match | 4,963 contacts → |
“Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Sailpointsailpoint.comHQ: HQ not recorded; location: London, United KingdomReported employees: 1,001-5,000 | HQ not recorded; location: London, United Kingdom | 1,001-5,000 | Exact match | 3,059 contacts → |
“SailPoint equips the modern enterprise to seamlessly manage and secure access to applications and data through the lens of identity – at speed and scale.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Darktracedarktrace.comHQ: HQ not recorded; location: Cambridge, United KingdomReported employees: 1,001-5,000 | HQ not recorded; location: Cambridge, United Kingdom | 1,001-5,000 | Exact match | 2,590 contacts → |
“Darktrace is a global leader in AI cybersecurity, providing the essential cybersecurity platform to secure organizations today and for an ever-changing future.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Hack The BOXhackthebox.comHQ: HQ not recorded; location: Folkestone, United KingdomReported employees: Not recorded | HQ not recorded; location: Folkestone, United Kingdom | Not recorded | Exact match | 1,946 contacts → |
“Hack The Box is the leading AI-powered cybersecurity readiness and upskilling platform, trusted by 1,500+ organizations worldwide, including Fortune 500 enterprises, government…” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Zerofoxzerofox.comHQ: HQ not recorded; location: United KingdomReported employees: 501-1,000 | HQ not recorded; location: United Kingdom | 501-1,000 | Exact match | 894 contacts → |
“ZeroFox is the solution to discover, validate, and disrupt external cyber threats before they harm revenue or reputation.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  SISAsisa.aiHQ: HQ not recorded; location: Leicester, United KingdomReported employees: 201-500 | HQ not recorded; location: Leicester, United Kingdom | 201-500 | Exact match | 739 contacts → |
“SISA is a global forensics-driven cybersecurity solutions company, trusted by leading organizations for securing their businesses with robust preventive, detective, and corrective…” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Clarotyclaroty.comHQ: HQ not recorded; location: London, United KingdomReported employees: 501-1,000 | HQ not recorded; location: London, United Kingdom | 501-1,000 | Exact match | 729 contacts → |
“Claroty has redefined cyber-physical systems (CPS) protection with an unrivaled industry-centric platform built to secure mission-critical infrastructure.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  ROKEroke.co.ukHQ: HQ not recorded; location: Manchester, United KingdomReported employees: 1,001-5,000 | HQ not recorded; location: Manchester, United Kingdom | 1,001-5,000 | Exact match | 684 contacts → |
“At Roke, we stand at the forefront of defence and security, delivering cutting-edge intelligence and engineering solutions that protect nations, troops, borders, and businesses.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Everfoxeverfox.comHQ: HQ not recorded; location: London, United KingdomReported employees: 1,001-5,000 | HQ not recorded; location: London, United Kingdom | 1,001-5,000 | Exact match | 635 contacts → |
“Everfox delivers trusted connectivity to protect the world's most critical environments, safeguarding the sensitive information behind decision advantage.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  MASSmass.co.ukHQ: HQ not recorded; location: Lincoln, United KingdomReported employees: 201-500 | HQ not recorded; location: Lincoln, United Kingdom | 201-500 | Exact match | 633 contacts → |
“MASS, part of the Cohort plc group, helps you realise the value of your data.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Withsecurewithsecure.comHQ: HQ not recorded; location: London, United KingdomReported employees: 501-1,000 | HQ not recorded; location: London, United Kingdom | 501-1,000 | Exact match | 614 contacts → |
“WithSecure™ is Europe's cybersecurity partner of choice.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Yubicoyubico.comHQ: HQ not recorded; location: West Horsley, United KingdomReported employees: 501-1,000 | HQ not recorded; location: West Horsley, United Kingdom | 501-1,000 | Exact match | 546 contacts → |
“Yubico (Nasdaq Stockholm: YUBICO) is a modern cybersecurity company on a mission to make the digital world safer for everyone.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Biocatchbiocatch.comHQ: HQ not recorded; location: London, United KingdomReported employees: 201-500 | HQ not recorded; location: London, United Kingdom | 201-500 | Exact match | 429 contacts → |
“BioCatch prevents financial crime by recognizing patterns in human behavior.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Integrity360integrity360.comHQ: HQ not recorded; location: London, United KingdomReported employees: 501-1,000 | HQ not recorded; location: London, United Kingdom | 501-1,000 | Exact match | 341 contacts → |
“Integrity360 is a leading independent cyber security and PCI specialist operating across EMEA and North America, with offices spanning the UK and Ireland, Bulgaria, Italy, Sweden…” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Bridewellbridewell.comHQ: HQ not recorded; location: Edinburgh, United KingdomReported employees: 201-500 | HQ not recorded; location: Edinburgh, United Kingdom | 201-500 | Exact match | 304 contacts → |
“Bridewell is the trusted cyber security partner for organisations operating within Critical National Infrastructure (CNI), as well as companies who want the highest standard of…” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Quorum Cyberquorumcyber.comHQ: HQ not recorded; location: Edinburgh, United KingdomReported employees: 201-500 | HQ not recorded; location: Edinburgh, United Kingdom | 201-500 | Exact match | 292 contacts → |
“At Quorum Cyber, we're on a mission to help good people win.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Vipre Security Groupvipre.comHQ: HQ not recorded; location: Newcastle, United KingdomReported employees: 201-500 | HQ not recorded; location: Newcastle, United Kingdom | 201-500 | Exact match | 207 contacts → |
“At VIPRE Security, our mission is to help humanity prosper by creating a high level of trust that enables digital safety for all.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Netcraftnetcraft.comHQ: HQ not recorded; location: London, United KingdomReported employees: 201-500 | HQ not recorded; location: London, United Kingdom | 201-500 | Exact match | 206 contacts → |
“Netcraft provides powerful phishing detection, cybercrime disruption and website takedown solutions to the world's largest organizations” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  The Redesign Groupredesign-group.comHQ: HQ not recorded; location: London, United KingdomReported employees: 201-500 | HQ not recorded; location: London, United Kingdom | 201-500 | Exact match | 201 contacts → |
“The Redesign Group is a global technology and cybersecurity consulting firm leveraging design thinking, interdependent subject matter expertise, and emerging technology solutions…” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  Intragenintragen.comHQ: HQ not recorded; location: London, United KingdomReported employees: 201-500 | HQ not recorded; location: London, United Kingdom | 201-500 | Exact match | 188 contacts → |
“Intragen is a cyber security business focused on managed Identity solutions and services.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Exclusive Networks UKexclusive-networks.comHQ: HQ not recorded; location: Mansfield, United KingdomReported employees: 201-500 | HQ not recorded; location: Mansfield, United Kingdom | 201-500 | Exact match | 168 contacts → |
“Exclusive Networks is a global trusted cybersecurity specialist for digital infrastructure helping to drive the transition to a totally trusted digital future for all people and…” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  LOGIQlogiq.co.ukHQ: HQ not recorded; location: Bristol, United KingdomReported employees: 201-500 | HQ not recorded; location: Bristol, United Kingdom | 201-500 | Exact match | 142 contacts → |
“Logiq is a UK-based cyber security consultancy and secure managed services provider supporting defence, government, and critical national infrastructure (CNI) organisations where…” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  Cybersec Consultingcybersecit.netHQ: HQ not recorded; location: London, United KingdomReported employees: 201-500 | HQ not recorded; location: London, United Kingdom | 201-500 | Exact match | 141 contacts → |
“CyberSec Consulting, headquartered in the UAE and serving the iMETA market, is a distinguished professional Cyber Security and Consulting services company.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  Cipher سايڤرcipher.com.saHQ: HQ not recorded; location: London, United KingdomReported employees: 201-500 | HQ not recorded; location: London, United Kingdom | 201-500 | Exact match | 135 contacts → |
“At Cipher, we're redefining digital security as the premier cybersecurity leader in the Middle East.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  Egress, A Knowbe4 Companyegress.comHQ: HQ not recorded; location: London, United KingdomReported employees: 201-500 | HQ not recorded; location: London, United Kingdom | 201-500 | Exact match | 123 contacts → |
“Our mission is to eliminate the most complex cybersecurity challenge every organization faces: insider risk.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 2,100 company matches
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Cybersecurity firms: dataset insights
September 1, 2026These summaries describe recorded coverage in this saved dataset. Coverage describes records in RevenueBase, rather than a census of every business in this market.
Reported company sizes
2,089 records in the displayed employee bands.
11 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
Coverage describes records in RevenueBase, rather than a census of every business in this market.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 1, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Cybersecurity firms by metro
Questions about this company list
What does Exact match mean for cybersecurity firms?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many cybersecurity firms did RevenueBase find based in the United Kingdom?
The saved snapshot records 2,100 matching company records, 40,405 tracked contacts and 16,845 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 1, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Cybersecurity firms by geography
- Cybersecurity firms based in the United States
- Cybersecurity firms based in France
- Cybersecurity firms based in Canada
- Cybersecurity firms based in Brazil
- Cybersecurity firms based in Australia
- Cybersecurity firms based in Germany
- Cybersecurity firms based in Spain
- Cybersecurity firms based in the Netherlands
- Cybersecurity firms based in Italy
- Cybersecurity firms based in Israel
- Cybersecurity firms based in Mexico
- Cybersecurity firms based in South Africa
Browse the directory
Cite this list
RevenueBase Data Team. Top 25 cybersecurity firms based in the United Kingdom. Snapshot: September 1, 2026. https://revenuebase.ai/companies/cybersecurity-firms/united-kingdom.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
Company intelligence · public preview
Top 25 cybersecurity firms based in the United Kingdom
RevenueBase records 2,100 matching company records for cybersecurity firms based in the United Kingdom, with 40,405 tracked contacts and 16,845 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 1, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 cybersecurity firms based in the United Kingdom
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | Sophossophos.com HQ: HQ not recorded; location: Abingdon, United KingdomReported employees: 5,001-10,000 | HQ not recorded; location: Abingdon, United Kingdom | 5,001-10,000 | Exact match | 4,963 contacts → |
“Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Sailpointsailpoint.com HQ: HQ not recorded; location: London, United KingdomReported employees: 1,001-5,000 | HQ not recorded; location: London, United Kingdom | 1,001-5,000 | Exact match | 3,059 contacts → |
“SailPoint equips the modern enterprise to seamlessly manage and secure access to applications and data through the lens of identity – at speed and scale.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Darktracedarktrace.com HQ: HQ not recorded; location: Cambridge, United KingdomReported employees: 1,001-5,000 | HQ not recorded; location: Cambridge, United Kingdom | 1,001-5,000 | Exact match | 2,590 contacts → |
“Darktrace is a global leader in AI cybersecurity, providing the essential cybersecurity platform to secure organizations today and for an ever-changing future.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Hack The BOXhackthebox.com HQ: HQ not recorded; location: Folkestone, United KingdomReported employees: Not recorded | HQ not recorded; location: Folkestone, United Kingdom | Not recorded | Exact match | 1,946 contacts → |
“Hack The Box is the leading AI-powered cybersecurity readiness and upskilling platform, trusted by 1,500+ organizations worldwide, including Fortune 500 enterprises, government…” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Zerofoxzerofox.com HQ: HQ not recorded; location: United KingdomReported employees: 501-1,000 | HQ not recorded; location: United Kingdom | 501-1,000 | Exact match | 894 contacts → |
“ZeroFox is the solution to discover, validate, and disrupt external cyber threats before they harm revenue or reputation.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | SISAsisa.ai HQ: HQ not recorded; location: Leicester, United KingdomReported employees: 201-500 | HQ not recorded; location: Leicester, United Kingdom | 201-500 | Exact match | 739 contacts → |
“SISA is a global forensics-driven cybersecurity solutions company, trusted by leading organizations for securing their businesses with robust preventive, detective, and corrective…” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Clarotyclaroty.com HQ: HQ not recorded; location: London, United KingdomReported employees: 501-1,000 | HQ not recorded; location: London, United Kingdom | 501-1,000 | Exact match | 729 contacts → |
“Claroty has redefined cyber-physical systems (CPS) protection with an unrivaled industry-centric platform built to secure mission-critical infrastructure.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | ROKEroke.co.uk HQ: HQ not recorded; location: Manchester, United KingdomReported employees: 1,001-5,000 | HQ not recorded; location: Manchester, United Kingdom | 1,001-5,000 | Exact match | 684 contacts → |
“At Roke, we stand at the forefront of defence and security, delivering cutting-edge intelligence and engineering solutions that protect nations, troops, borders, and businesses.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Everfoxeverfox.com HQ: HQ not recorded; location: London, United KingdomReported employees: 1,001-5,000 | HQ not recorded; location: London, United Kingdom | 1,001-5,000 | Exact match | 635 contacts → |
“Everfox delivers trusted connectivity to protect the world's most critical environments, safeguarding the sensitive information behind decision advantage.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | MASSmass.co.uk HQ: HQ not recorded; location: Lincoln, United KingdomReported employees: 201-500 | HQ not recorded; location: Lincoln, United Kingdom | 201-500 | Exact match | 633 contacts → |
“MASS, part of the Cohort plc group, helps you realise the value of your data.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Withsecurewithsecure.com HQ: HQ not recorded; location: London, United KingdomReported employees: 501-1,000 | HQ not recorded; location: London, United Kingdom | 501-1,000 | Exact match | 614 contacts → |
“WithSecure™ is Europe's cybersecurity partner of choice.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Yubicoyubico.com HQ: HQ not recorded; location: West Horsley, United KingdomReported employees: 501-1,000 | HQ not recorded; location: West Horsley, United Kingdom | 501-1,000 | Exact match | 546 contacts → |
“Yubico (Nasdaq Stockholm: YUBICO) is a modern cybersecurity company on a mission to make the digital world safer for everyone.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Biocatchbiocatch.com HQ: HQ not recorded; location: London, United KingdomReported employees: 201-500 | HQ not recorded; location: London, United Kingdom | 201-500 | Exact match | 429 contacts → |
“BioCatch prevents financial crime by recognizing patterns in human behavior.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Integrity360integrity360.com HQ: HQ not recorded; location: London, United KingdomReported employees: 501-1,000 | HQ not recorded; location: London, United Kingdom | 501-1,000 | Exact match | 341 contacts → |
“Integrity360 is a leading independent cyber security and PCI specialist operating across EMEA and North America, with offices spanning the UK and Ireland, Bulgaria, Italy, Sweden…” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Bridewellbridewell.com HQ: HQ not recorded; location: Edinburgh, United KingdomReported employees: 201-500 | HQ not recorded; location: Edinburgh, United Kingdom | 201-500 | Exact match | 304 contacts → |
“Bridewell is the trusted cyber security partner for organisations operating within Critical National Infrastructure (CNI), as well as companies who want the highest standard of…” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Quorum Cyberquorumcyber.com HQ: HQ not recorded; location: Edinburgh, United KingdomReported employees: 201-500 | HQ not recorded; location: Edinburgh, United Kingdom | 201-500 | Exact match | 292 contacts → |
“At Quorum Cyber, we're on a mission to help good people win.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Vipre Security Groupvipre.com HQ: HQ not recorded; location: Newcastle, United KingdomReported employees: 201-500 | HQ not recorded; location: Newcastle, United Kingdom | 201-500 | Exact match | 207 contacts → |
“At VIPRE Security, our mission is to help humanity prosper by creating a high level of trust that enables digital safety for all.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Netcraftnetcraft.com HQ: HQ not recorded; location: London, United KingdomReported employees: 201-500 | HQ not recorded; location: London, United Kingdom | 201-500 | Exact match | 206 contacts → |
“Netcraft provides powerful phishing detection, cybercrime disruption and website takedown solutions to the world's largest organizations” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | The Redesign Groupredesign-group.com HQ: HQ not recorded; location: London, United KingdomReported employees: 201-500 | HQ not recorded; location: London, United Kingdom | 201-500 | Exact match | 201 contacts → |
“The Redesign Group is a global technology and cybersecurity consulting firm leveraging design thinking, interdependent subject matter expertise, and emerging technology solutions…” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Intragenintragen.com HQ: HQ not recorded; location: London, United KingdomReported employees: 201-500 | HQ not recorded; location: London, United Kingdom | 201-500 | Exact match | 188 contacts → |
“Intragen is a cyber security business focused on managed Identity solutions and services.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Exclusive Networks UKexclusive-networks.com HQ: HQ not recorded; location: Mansfield, United KingdomReported employees: 201-500 | HQ not recorded; location: Mansfield, United Kingdom | 201-500 | Exact match | 168 contacts → |
“Exclusive Networks is a global trusted cybersecurity specialist for digital infrastructure helping to drive the transition to a totally trusted digital future for all people and…” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | LOGIQlogiq.co.uk HQ: HQ not recorded; location: Bristol, United KingdomReported employees: 201-500 | HQ not recorded; location: Bristol, United Kingdom | 201-500 | Exact match | 142 contacts → |
“Logiq is a UK-based cyber security consultancy and secure managed services provider supporting defence, government, and critical national infrastructure (CNI) organisations where…” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Cybersec Consultingcybersecit.net HQ: HQ not recorded; location: London, United KingdomReported employees: 201-500 | HQ not recorded; location: London, United Kingdom | 201-500 | Exact match | 141 contacts → |
“CyberSec Consulting, headquartered in the UAE and serving the iMETA market, is a distinguished professional Cyber Security and Consulting services company.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Cipher سايڤرcipher.com.sa HQ: HQ not recorded; location: London, United KingdomReported employees: 201-500 | HQ not recorded; location: London, United Kingdom | 201-500 | Exact match | 135 contacts → |
“At Cipher, we're redefining digital security as the premier cybersecurity leader in the Middle East.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Egress, A Knowbe4 Companyegress.com HQ: HQ not recorded; location: London, United KingdomReported employees: 201-500 | HQ not recorded; location: London, United Kingdom | 201-500 | Exact match | 123 contacts → |
“Our mission is to eliminate the most complex cybersecurity challenge every organization faces: insider risk.” Recorded description excerpt · September 1, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 2,100 company matches
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Cybersecurity firms: dataset insights
September 1, 2026These summaries describe recorded coverage in this saved dataset. Coverage describes records in RevenueBase, rather than a census of every business in this market.
Reported company sizes
2,089 records in the displayed employee bands.
11 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
Coverage describes records in RevenueBase, rather than a census of every business in this market.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 1, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Cybersecurity firms by metro
Questions about this company list
What does Exact match mean for cybersecurity firms?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many cybersecurity firms did RevenueBase find based in the United Kingdom?
The saved snapshot records 2,100 matching company records, 40,405 tracked contacts and 16,845 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 1, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Cybersecurity firms by geography
- Cybersecurity firms based in the United States
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- Cybersecurity firms based in Canada
- Cybersecurity firms based in Brazil
- Cybersecurity firms based in Australia
- Cybersecurity firms based in Germany
- Cybersecurity firms based in Spain
- Cybersecurity firms based in the Netherlands
- Cybersecurity firms based in Italy
- Cybersecurity firms based in Israel
- Cybersecurity firms based in Mexico
- Cybersecurity firms based in South Africa
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Cite this list
RevenueBase Data Team. Top 25 cybersecurity firms based in the United Kingdom. Snapshot: September 1, 2026. https://revenuebase.ai/companies/cybersecurity-firms/united-kingdom.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗