Company lists · Data refreshed September 2026
Top 23 Security testing companies based in London, United Kingdom
RevenueBase identified 170 company matches for security testing companies associated with London, United Kingdom as of September 2026 and tracks 2,262 professional contacts across them, including 365 with verified work emails and 212 with mobile numbers. Across the United Kingdom, London is the largest hub for this category.
This list covers company matches for security testing companies associated with London, 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 13, 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 23 largest security testing companies based in London, United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 64 contacts → | ||||
Exact match “YOU DESERVE TO BE HACKED®.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 2 | 61 contacts → | ||||
Exact match “Intruder's continuous exposure management platform helps security, IT, and engineering teams stop breaches before they start.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 3 | 57 contacts → | ||||
Exact match “We deliver services in Cybersecurity, Application Security and DevOps and are trusted by some of the world’s leading brands to maximise the value of their security investments and…” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 4 | 51 contacts → | ||||
Exact match “Redscan is an award-winning provider of managed security services, specialising in Managed Detection and Response, Penetration Testing and Red Teaming.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 5 | 36 contacts → | ||||
Exact match “RedHunt Labs is a research-driven cybersecurity company delivering Continuous Threat Exposure Management (CTEM), PTaaS, and AI Exposure Security.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 6 | 33 contacts → | ||||
Exact match “NotSoSecure Training, part of Claranet Cyber Security.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 7 | 24 contacts → | ||||
Exact match “SSL247 (A Sectigo Company) has nearly 20 years of security consulting experience operating in 18 different markets globally.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 8 | 23 contacts → | ||||
Exact match “Toro was founded on creating the UK's first Red Team penetration test - and then attacking hundreds of clients by hacking their systems, influencing / social engineering staff and…” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 9 | 20 contacts → | ||||
Exact match “Secure Purple is a leading cyber security and digital safety firm that provides innovative solutions and services to help organisations and individuals stay protected in the…” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 10 | 18 contacts → | ||||
Exact match “th4ts3cur1ty.company supplies cyber security services internationally.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 11 | 17 contacts → | ||||
Exact match “We are a leading cybersecurity services organization with more than a decade of proven expertise in consulting, solution implementation and managed services.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 12 | 17 contacts → | ||||
Exact match “We are a London based specialist supplier of cyber defence solution and information security services.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 13 | 15 contacts → | ||||
Exact match “Who We Are DataSixth delivers Cybersecurity Intelligence.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 14 | 15 contacts → | ||||
Exact match “is an ISO 9001:2015 and ISO/IEC 27001:2022 certified, DPIIT-recognized cybersecurity company delivering structured External Vulnerability Assessment & Penetration Testing (VAPT)…” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 15 | 13 contacts → | ||||
Exact match “Our mission at SOCGuardians is to empower organizations to operate confidently in a digital world by providing cutting-edge cybersecurity services.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 16 | 12 contacts → | ||||
Exact match “At Cyber Armed Security, we protect organisations worldwide from evolving cyber threats through intelligence-driven ethical hacking.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 17 | 11 contacts → | ||||
Exact match “CyTAL exists to help developers, manufacturers and their customers to improve the security and resilience of products and systems.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 18 | 11 contacts → | ||||
Exact match “Disclosure Cybersecurity Ltd is a specialist cyber security company, formed by professionals with extensive experience and wide exposure in the cyber security market.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 19 | 10 contacts → | ||||
Exact match “SecureTeam are a UK-based information security practice, specialising in all areas of cybersecurity.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 20 | 10 contacts → | ||||
Exact match “We are a UK-based Cyber Security company offering a comprehensive portfolio specialising in innovative solutions for Penetration Testing, Training, Compliance, Consulting, and…” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 21 | 10 contacts → | ||||
Exact match “Validato helps organisations continuously validate and strengthen their cybersecurity controls using safe-to-use, production-ready Breach and Attack Simulation (BAS).” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 22 | 8 contacts → | ||||
Exact match “iCyberDefence is a boutique cybersecurity services firm that offers a wide range of security consulting and security engineering services with the necessary products and tools.” Recorded in the RevenueBase company graph · Sep 13, 2026 · View company records in RevenueBase | |||||
| 23 | 8 contacts → | ||||
Exact match “We provide a wide range of Penetration Testing Services: External & Internal Network Pentest, Application Pentest and Social Engineering Attacks.” Recorded in the RevenueBase company graph · Sep 13, 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 “security testing companies”. 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 23 of 170 security testing companies based in London, United Kingdom
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Security testing companies based in London, United Kingdom at a glance
As of Sep 13, 2026Companies by employee count
Freshness & accuracy
How recently the business emails were verified and the company information checked
Email last verified
Median 16.0dCompany record updated
Median 77.0dHow 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 London, United Kingdom whose business descriptions match “security testing companies” 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 365 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 13, 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.
Security testing companies by metro in the United Kingdom
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 “security testing companies”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many security testing companies are there based in London, United Kingdom?
RevenueBase identified 170 company matches for security testing companies associated with London, 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?
Covertswarm tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which city in the United Kingdom has the most security testing companies?
London leads the United Kingdom with 177 company records, followed by Manchester (26) and Birmingham (14).
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 365 professional contacts with verified work emails tracked across these 170 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 13, 2026.
Ready to reach these companies? Verified emails and direct dials for all 170 security testing companies based in London, United Kingdom. Start with a free account, no credit card.
Download this list →Related lists
Security testing companies by geography
- Security testing companies based in the United States
- Security testing companies based in the United Kingdom
- Security testing companies based in Canada
- Security testing companies based in France
- Security testing companies based in Germany
- Security testing companies based in Brazil
- Security testing companies based in Australia
- Security testing companies based in the Netherlands
- Security testing companies based in Spain
- Security testing companies based in Israel
- Security testing companies based in Poland
- Security testing companies based in Italy
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
- All company lists
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- Lists A-Z
- New lists
- Security testing companies based in the United States
- Security testing companies based in the United Kingdom
- Security testing companies based in Canada
- Security testing companies based in France
- Security testing companies based in Germany
- Security testing companies based in Brazil
Company intelligence · public preview
Top 23 security testing companies based in London, 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 170 matching company records for security testing companies based in London, United Kingdom, with 2,262 tracked contacts and 365 verified work emails.
This public preview shows 23 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 13, 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 23 security testing companies based in London, 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 |  Covertswarmcovertswarm.comHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 64 contacts → |
“YOU DESERVE TO BE HACKED®.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Intruderintruder.ioHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 61 contacts → |
“Intruder's continuous exposure management platform helps security, IT, and engineering teams stop breaches before they start.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Riversaferiversafe.co.ukHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 57 contacts → |
“We deliver services in Cybersecurity, Application Security and DevOps and are trusted by some of the world’s leading brands to maximise the value of their security investments and…” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Redscan, A Kroll Businessredscan.comHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 51 contacts → |
“Redscan is an award-winning provider of managed security services, specialising in Managed Detection and Response, Penetration Testing and Red Teaming.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Redhunt Labsredhuntlabs.comHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 36 contacts → |
“RedHunt Labs is a research-driven cybersecurity company delivering Continuous Threat Exposure Management (CTEM), PTaaS, and AI Exposure Security.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | HQ: London, United KingdomReported employees: 1,001-5,000 | London, United Kingdom | 1,001-5,000 | Exact match | 33 contacts → |
“NotSoSecure Training, part of Claranet Cyber Security.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Ssl247 A Sectigo Companyssl247.comHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 24 contacts → |
“SSL247 (A Sectigo Company) has nearly 20 years of security consulting experience operating in 18 different markets globally.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Toro Solutionstorosolutions.co.ukHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 23 contacts → |
“Toro was founded on creating the UK's first Red Team penetration test - and then attacking hundreds of clients by hacking their systems, influencing / social engineering staff and…” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Secure Purplesecurepurple.comHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 20 contacts → |
“Secure Purple is a leading cyber security and digital safety firm that provides innovative solutions and services to help organisations and individuals stay protected in the…” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  th4ts3cur1ty.companyth4ts3cur1ty.companyHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 18 contacts → |
“th4ts3cur1ty.company supplies cyber security services internationally.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Sinevissinevis.comHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 17 contacts → |
“We are a leading cybersecurity services organization with more than a decade of proven expertise in consulting, solution implementation and managed services.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 17 contacts → |
“We are a London based specialist supplier of cyber defence solution and information security services.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Datasixth Consultingdatasixth.comHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 15 contacts → |
“Who We Are DataSixth delivers Cybersecurity Intelligence.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Eh1-Infotech Cybersecurityeh1infotech.comHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 15 contacts → |
“is an ISO 9001:2015 and ISO/IEC 27001:2022 certified, DPIIT-recognized cybersecurity company delivering structured External Vulnerability Assessment & Penetration Testing (VAPT)…” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Socguardians LTDsocguardians.comHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 13 contacts → |
“Our mission at SOCGuardians is to empower organizations to operate confidently in a digital world by providing cutting-edge cybersecurity services.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Cyber Armed Securitycyberarmedsecurity.comHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 12 contacts → |
“At Cyber Armed Security, we protect organisations worldwide from evolving cyber threats through intelligence-driven ethical hacking.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  CYTALcytal.co.ukHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 11 contacts → |
“CyTAL exists to help developers, manufacturers and their customers to improve the security and resilience of products and systems.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Disclosure Cybersecuritydisclosurecybersecurity.comHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 11 contacts → |
“Disclosure Cybersecurity Ltd is a specialist cyber security company, formed by professionals with extensive experience and wide exposure in the cyber security market.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  Secureteam LTDsecureteam.co.ukHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 10 contacts → |
“SecureTeam are a UK-based information security practice, specialising in all areas of cybersecurity.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  Pentiqpentiq.comHQ: London, United KingdomReported employees: 1-10 | London, United Kingdom | 1-10 | Exact match | 10 contacts → |
“We are a UK-based Cyber Security company offering a comprehensive portfolio specialising in innovative solutions for Penetration Testing, Training, Compliance, Consulting, and…” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Validatovalidato.ioHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 10 contacts → |
“Validato helps organisations continuously validate and strengthen their cybersecurity controls using safe-to-use, production-ready Breach and Attack Simulation (BAS).” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  Icyberdefenceicyberdefence.comHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 8 contacts → |
“iCyberDefence is a boutique cybersecurity services firm that offers a wide range of security consulting and security engineering services with the necessary products and tools.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  Xray Cybersecurityxray-sec.comHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 8 contacts → |
“We provide a wide range of Penetration Testing Services: External & Internal Network Pentest, Application Pentest and Social Engineering Attacks.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 23 of 170 company matches
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Security testing companies: dataset insights
September 13, 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
170 records in the displayed employee bands.
0 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Freshness & accuracy
How recently the business emails were verified and the company information checked
Email last verified
Median 16.0dCompany record updated
Median 77.0dHow 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 13, 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 ↗
Security testing companies by metro in the United Kingdom
Questions about this company list
What does Exact match mean for security testing companies?
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 security testing companies did RevenueBase find based in London, United Kingdom?
The saved snapshot records 170 matching company records, 2,262 tracked contacts and 365 verified emails. The public preview displays 23 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 13, 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
Security testing companies by geography
- Security testing companies based in the United States
- Security testing companies based in the United Kingdom
- Security testing companies based in Canada
- Security testing companies based in France
- Security testing companies based in Germany
- Security testing companies based in Brazil
- Security testing companies based in Australia
- Security testing companies based in the Netherlands
- Security testing companies based in Spain
- Security testing companies based in Israel
- Security testing companies based in Poland
- Security testing companies based in Italy
Cite this list
RevenueBase Data Team. Top 23 security testing companies based in London, United Kingdom. Snapshot: September 13, 2026. https://revenuebase.ai/companies/security-testing-companies/united-kingdom/london.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Security testing companies based in the United States
- Security testing companies based in the United Kingdom
- Security testing companies based in Canada
- Security testing companies based in France
- Security testing companies based in Germany
- Security testing companies based in Brazil
Company intelligence · public preview
Top 23 security testing companies based in London, United Kingdom
RevenueBase records 170 matching company records for security testing companies based in London, United Kingdom, with 2,262 tracked contacts and 365 verified work emails.
This public preview shows 23 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 13, 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 23 security testing companies based in London, 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 | Covertswarmcovertswarm.com HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 64 contacts → |
“YOU DESERVE TO BE HACKED®.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Intruderintruder.io HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 61 contacts → |
“Intruder's continuous exposure management platform helps security, IT, and engineering teams stop breaches before they start.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Riversaferiversafe.co.uk HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 57 contacts → |
“We deliver services in Cybersecurity, Application Security and DevOps and are trusted by some of the world’s leading brands to maximise the value of their security investments and…” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Redscan, A Kroll Businessredscan.com HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 51 contacts → |
“Redscan is an award-winning provider of managed security services, specialising in Managed Detection and Response, Penetration Testing and Red Teaming.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Redhunt Labsredhuntlabs.com HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 36 contacts → |
“RedHunt Labs is a research-driven cybersecurity company delivering Continuous Threat Exposure Management (CTEM), PTaaS, and AI Exposure Security.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | HQ: London, United KingdomReported employees: 1,001-5,000 | London, United Kingdom | 1,001-5,000 | Exact match | 33 contacts → |
“NotSoSecure Training, part of Claranet Cyber Security.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Ssl247 A Sectigo Companyssl247.com HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 24 contacts → |
“SSL247 (A Sectigo Company) has nearly 20 years of security consulting experience operating in 18 different markets globally.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Toro Solutionstorosolutions.co.uk HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 23 contacts → |
“Toro was founded on creating the UK's first Red Team penetration test - and then attacking hundreds of clients by hacking their systems, influencing / social engineering staff and…” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Secure Purplesecurepurple.com HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 20 contacts → |
“Secure Purple is a leading cyber security and digital safety firm that provides innovative solutions and services to help organisations and individuals stay protected in the…” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | th4ts3cur1ty.companyth4ts3cur1ty.company HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 18 contacts → |
“th4ts3cur1ty.company supplies cyber security services internationally.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Sinevissinevis.com HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 17 contacts → |
“We are a leading cybersecurity services organization with more than a decade of proven expertise in consulting, solution implementation and managed services.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 17 contacts → |
“We are a London based specialist supplier of cyber defence solution and information security services.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Datasixth Consultingdatasixth.com HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 15 contacts → |
“Who We Are DataSixth delivers Cybersecurity Intelligence.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Eh1-Infotech Cybersecurityeh1infotech.com HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 15 contacts → |
“is an ISO 9001:2015 and ISO/IEC 27001:2022 certified, DPIIT-recognized cybersecurity company delivering structured External Vulnerability Assessment & Penetration Testing (VAPT)…” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Socguardians LTDsocguardians.com HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 13 contacts → |
“Our mission at SOCGuardians is to empower organizations to operate confidently in a digital world by providing cutting-edge cybersecurity services.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Cyber Armed Securitycyberarmedsecurity.com HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 12 contacts → |
“At Cyber Armed Security, we protect organisations worldwide from evolving cyber threats through intelligence-driven ethical hacking.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | CYTALcytal.co.uk HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 11 contacts → |
“CyTAL exists to help developers, manufacturers and their customers to improve the security and resilience of products and systems.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Disclosure Cybersecuritydisclosurecybersecurity.com HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 11 contacts → |
“Disclosure Cybersecurity Ltd is a specialist cyber security company, formed by professionals with extensive experience and wide exposure in the cyber security market.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Secureteam LTDsecureteam.co.uk HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 10 contacts → |
“SecureTeam are a UK-based information security practice, specialising in all areas of cybersecurity.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Pentiqpentiq.com HQ: London, United KingdomReported employees: 1-10 | London, United Kingdom | 1-10 | Exact match | 10 contacts → |
“We are a UK-based Cyber Security company offering a comprehensive portfolio specialising in innovative solutions for Penetration Testing, Training, Compliance, Consulting, and…” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Validatovalidato.io HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 10 contacts → |
“Validato helps organisations continuously validate and strengthen their cybersecurity controls using safe-to-use, production-ready Breach and Attack Simulation (BAS).” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | Icyberdefenceicyberdefence.com HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 8 contacts → |
“iCyberDefence is a boutique cybersecurity services firm that offers a wide range of security consulting and security engineering services with the necessary products and tools.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Xray Cybersecurityxray-sec.com HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 8 contacts → |
“We provide a wide range of Penetration Testing Services: External & Internal Network Pentest, Application Pentest and Social Engineering Attacks.” Recorded description excerpt · September 13, 2026Open company data in RevenueBase ↗Free signup required. | |||||
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Security testing companies: dataset insights
September 13, 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
170 records in the displayed employee bands.
0 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Freshness & accuracy
How recently the business emails were verified and the company information checked
Email last verified
Median 16.0dCompany record updated
Median 77.0dHow 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 13, 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 ↗
Security testing companies by metro in the United Kingdom
Questions about this company list
What does Exact match mean for security testing companies?
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 security testing companies did RevenueBase find based in London, United Kingdom?
The saved snapshot records 170 matching company records, 2,262 tracked contacts and 365 verified emails. The public preview displays 23 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 13, 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.
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Cite this list
RevenueBase Data Team. Top 23 security testing companies based in London, United Kingdom. Snapshot: September 13, 2026. https://revenuebase.ai/companies/security-testing-companies/united-kingdom/london.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
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