Company lists · Data refreshed September 2026
Top 25 Offensive security testing providers based in the United Kingdom
RevenueBase identified 308 company matches for offensive security testing providers associated with the United Kingdom as of September 2026 and tracks 3,878 professional contacts across them, including 907 with verified work emails. London is the largest hub.
This list covers company matches for offensive security testing providers 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 29, 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 offensive security testing providers based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 267 contacts → | ||||
Exact match “PortSwigger is a global leader in the creation of software tools for security testing of web applications.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 2 | 99 contacts → | ||||
Exact match “AppCheck is a Complete Enterprise Security Testing Solution that provides up to the minute vulnerability coverage for your entire estate.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 3 | 77 contacts → | ||||
Exact match “White Hat, part of the EPAM group, is an award-winning cyber intelligence and offensive security company that leverages an attacker’s perspective to shape innovative, proactive…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 4 | 73 contacts → | ||||
Exact match “Dionach by Nomios has over 25 years of expertise in information security, supporting organisations in building resilience against ever‑evolving cyber threats.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 5 | 64 contacts → | ||||
Exact match “YOU DESERVE TO BE HACKED®.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 6 | 61 contacts → | ||||
Exact match “MDSec are a UK based consultancy with a passion for information security.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 7 | 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 29, 2026 · View company records in RevenueBase | |||||
| 8 | 49 contacts → | ||||
Exact match “Human-Led Continuous Testing.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 9 | 39 contacts → | ||||
Exact match “SECFORCE are vendor independent offensive security specialists providing effective business risk intelligence and strategic security consulting.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 10 | 39 contacts → | ||||
Exact match “OnSecurity offers CREST-accredited AI Augmented Penetration Testing, all whilst harnessing technology to simplify the management and delivery of pentesting.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 11 | 36 contacts → | ||||
Exact match “Secarma exists to keep the world safe.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 12 | 34 contacts → | ||||
Exact match “Pentesting Exams by Pentesting Experts.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 13 | 33 contacts → | ||||
Exact match “NotSoSecure Training, part of Claranet Cyber Security.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 14 | 32 contacts → | ||||
Exact match “Aristi is a specialist provider of cyber security services with over 17 years of experience.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 15 | 32 contacts → | ||||
Exact match “CyberWarfare Labs (CWL) is a global cyber security education platform on a single mission, making practical cybersecurity Accessible, Affordable, and Unstoppable.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 16 | 31 contacts → | ||||
Exact match “Salus is a provider of world-class cyber security services, enabling our clients to identify and manage their cyber risks proactively and effectively.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 17 | 30 contacts → | ||||
Exact match “Cyber security can feel overwhelming.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 18 | 29 contacts → | ||||
Exact match “Imagine a world where cyber threats are simply another challenge that you're fully equipped to handle.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 19 | 26 contacts → | ||||
Exact match “Based in Manchester UK, we are an independent Cyber Security Consultancy providing Security services across a wide range of markets, from multi-national Corporate Organisations…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 20 | 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 29, 2026 · View company records in RevenueBase | |||||
| 21 | 23 contacts → | ||||
Exact match “CyberCrowd are a market leader in the cyber security realm, offering everything from Assessment Services through to Pen Testing, CISOaaS, Certification Readiness, DPO services…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 22 | 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 29, 2026 · View company records in RevenueBase | |||||
| 23 | 21 contacts → | ||||
Exact match “Chaleit is a cyber security management consultancy that aligns business context with real-world capability to solve complex risks.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 24 | 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 29, 2026 · View company records in RevenueBase | |||||
| 25 | 19 contacts → | ||||
Exact match “Razorthorn Security is a specialist cybersecurity consultancy founded in 2007, with nearly two decades of experience helping organisations protect their data, their systems and…” Recorded in the RevenueBase company graph · Sep 29, 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 “offensive security testing providers”. 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 308 offensive security testing providers based in the United Kingdom
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Offensive security testing providers based in the United Kingdom at a glance
As of Sep 29, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 308 companies.
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 “offensive security testing providers” 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 907 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 29, 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.
Offensive security testing providers 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 “offensive security testing providers”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many offensive security testing providers are there based in the United Kingdom?
RevenueBase identified 308 company matches for offensive security testing providers 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?
Portswigger tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which city has the most offensive security testing providers?
London leads with 119 company records, followed by Manchester (21) and Birmingham (9).
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 907 professional contacts with verified work emails tracked across these 308 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 29, 2026.
Ready to reach these companies? Verified emails and direct dials for all 308 offensive security testing providers based in the United Kingdom. Start with a free account, no credit card.
Download this list →Related lists
Offensive security testing providers by geography
- Offensive security testing providers based in Melbourne, Australia
- Offensive security testing providers based in Sydney, Australia
- Offensive security testing providers based in Toronto, Canada
- Offensive security testing providers based in Paris, France
- Offensive security testing providers based in Ahmedabad, India
- Offensive security testing providers based in Bangalore, India
- Offensive security testing providers based in Pune, India
- Offensive security testing providers based in London, United Kingdom
- Offensive security testing providers based in New York, United States
- Offensive security testing providers based in San Francisco, United States
- Offensive security testing providers based in Australia
- Offensive security testing providers based in Austria
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
- Offensive security testing providers based in Melbourne, Australia
- Offensive security testing providers based in Sydney, Australia
- Offensive security testing providers based in Toronto, Canada
- Offensive security testing providers based in Paris, France
- Offensive security testing providers based in Ahmedabad, India
- Offensive security testing providers based in Bangalore, India
Company intelligence · public preview
Top 25 offensive security testing providers 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 308 matching company records for offensive security testing providers based in the United Kingdom, with 3,878 tracked contacts and 907 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 29, 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 offensive security testing providers 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 |  Portswiggerportswigger.netHQ: Knutsford, United KingdomReported employees: 51-200 | Knutsford, United Kingdom | 51-200 | Exact match | 267 contacts → |
“PortSwigger is a global leader in the creation of software tools for security testing of web applications.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Appcheck LTDappcheck-ng.comHQ: Leeds, United KingdomReported employees: 51-200 | Leeds, United Kingdom | 51-200 | Exact match | 99 contacts → |
“AppCheck is a Complete Enterprise Security Testing Solution that provides up to the minute vulnerability coverage for your entire estate.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  White HAT An Epam Companywhite-hat-cyber.comHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 77 contacts → |
“White Hat, part of the EPAM group, is an award-winning cyber intelligence and offensive security company that leverages an attacker’s perspective to shape innovative, proactive…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Dionach By Nomiosdionach.comHQ: Oxford, United KingdomReported employees: 51-200 | Oxford, United Kingdom | 51-200 | Exact match | 73 contacts → |
“Dionach by Nomios has over 25 years of expertise in information security, supporting organisations in building resilience against ever‑evolving cyber threats.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  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 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  MDSECmdsec.co.ukHQ: Macclesfield, United KingdomReported employees: 11-50 | Macclesfield, United Kingdom | 11-50 | Exact match | 61 contacts → |
“MDSec are a UK based consultancy with a passion for information security.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  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 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Rootshell Securityrootshellsecurity.netHQ: Basingstoke, United KingdomReported employees: 51-200 | Basingstoke, United Kingdom | 51-200 | Exact match | 49 contacts → |
“Human-Led Continuous Testing.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Secforce LTDsecforce.comHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 39 contacts → |
“SECFORCE are vendor independent offensive security specialists providing effective business risk intelligence and strategic security consulting.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Onsecurityonsecurity.ioHQ: Bristol, United KingdomReported employees: 51-200 | Bristol, United Kingdom | 51-200 | Exact match | 39 contacts → |
“OnSecurity offers CREST-accredited AI Augmented Penetration Testing, all whilst harnessing technology to simplify the management and delivery of pentesting.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Secarma LTDsecarma.comHQ: Manchester, United KingdomReported employees: 11-50 | Manchester, United Kingdom | 11-50 | Exact match | 36 contacts → |
“Secarma exists to keep the world safe.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | The Secops Groupsecops.group HQ: Cambridge, United KingdomReported employees: 11-50 | Cambridge, United Kingdom | 11-50 | Exact match | 34 contacts → |
“Pentesting Exams by Pentesting Experts.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | 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 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Aristiaristi.co.ukHQ: Birmingham, United KingdomReported employees: 11-50 | Birmingham, United Kingdom | 11-50 | Exact match | 32 contacts → |
“Aristi is a specialist provider of cyber security services with over 17 years of experience.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Cyberwarfare Labscyberwarfare.liveHQ: Cambridge, United KingdomReported employees: 11-50 | Cambridge, United Kingdom | 11-50 | Exact match | 32 contacts → |
“CyberWarfare Labs (CWL) is a global cyber security education platform on a single mission, making practical cybersecurity Accessible, Affordable, and Unstoppable.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Salus Cybersaluscyber.comHQ: Cheltenham, United KingdomReported employees: 11-50 | Cheltenham, United Kingdom | 11-50 | Exact match | 31 contacts → |
“Salus is a provider of world-class cyber security services, enabling our clients to identify and manage their cyber risks proactively and effectively.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Citation Cybercitationcyber.comHQ: Lancaster, United KingdomReported employees: 11-50 | Lancaster, United Kingdom | 11-50 | Exact match | 30 contacts → |
“Cyber security can feel overwhelming.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Procheckup PCUprocheckup.comHQ: Portsmouth, United KingdomReported employees: 11-50 | Portsmouth, United Kingdom | 11-50 | Exact match | 29 contacts → |
“Imagine a world where cyber threats are simply another challenge that you're fully equipped to handle.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  Cyber Security Specialistscybersecurityspecialists.co.ukHQ: Altrincham, United KingdomReported employees: 11-50 | Altrincham, United Kingdom | 11-50 | Exact match | 26 contacts → |
“Based in Manchester UK, we are an independent Cyber Security Consultancy providing Security services across a wide range of markets, from multi-national Corporate Organisations…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  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 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Cybercrowdcybercrowd.co.ukHQ: Newbury, United KingdomReported employees: 11-50 | Newbury, United Kingdom | 11-50 | Exact match | 23 contacts → |
“CyberCrowd are a market leader in the cyber security realm, offering everything from Assessment Services through to Pen Testing, CISOaaS, Certification Readiness, DPO services…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  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 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  Chaleitchaleit.comHQ: Cambridge, United KingdomReported employees: 11-50 | Cambridge, United Kingdom | 11-50 | Exact match | 21 contacts → |
“Chaleit is a cyber security management consultancy that aligns business context with real-world capability to solve complex risks.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  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 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  Razorthorn Securityrazorthorn.comHQ: Tunbridge Wells, United KingdomReported employees: 11-50 | Tunbridge Wells, United Kingdom | 11-50 | Exact match | 19 contacts → |
“Razorthorn Security is a specialist cybersecurity consultancy founded in 2007, with nearly two decades of experience helping organisations protect their data, their systems and…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 308 company matches
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Offensive security testing providers: dataset insights
September 29, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
308 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.
Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 308 companies.
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.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
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 29, 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 ↗
Offensive security testing providers by metro
Questions about this company list
What does Exact match mean for offensive security testing providers?
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 offensive security testing providers did RevenueBase find based in the United Kingdom?
The saved snapshot records 308 matching company records, 3,878 tracked contacts and 907 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 29, 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
Offensive security testing providers by geography
- Offensive security testing providers based in Melbourne, Australia
- Offensive security testing providers based in Sydney, Australia
- Offensive security testing providers based in Toronto, Canada
- Offensive security testing providers based in Paris, France
- Offensive security testing providers based in Ahmedabad, India
- Offensive security testing providers based in Bangalore, India
- Offensive security testing providers based in Pune, India
- Offensive security testing providers based in London, United Kingdom
- Offensive security testing providers based in New York, United States
- Offensive security testing providers based in San Francisco, United States
- Offensive security testing providers based in Australia
- Offensive security testing providers based in Austria
Cite this list
RevenueBase Data Team. Top 25 offensive security testing providers based in the United Kingdom. Snapshot: September 29, 2026. https://revenuebase.ai/companies/offensive-security-testing-providers/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
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Offensive security testing providers based in Melbourne, Australia
- Offensive security testing providers based in Sydney, Australia
- Offensive security testing providers based in Toronto, Canada
- Offensive security testing providers based in Paris, France
- Offensive security testing providers based in Ahmedabad, India
- Offensive security testing providers based in Bangalore, India
Company intelligence · public preview
Top 25 offensive security testing providers based in the United Kingdom
RevenueBase records 308 matching company records for offensive security testing providers based in the United Kingdom, with 3,878 tracked contacts and 907 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 29, 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 offensive security testing providers 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 | Portswiggerportswigger.net HQ: Knutsford, United KingdomReported employees: 51-200 | Knutsford, United Kingdom | 51-200 | Exact match | 267 contacts → |
“PortSwigger is a global leader in the creation of software tools for security testing of web applications.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Appcheck LTDappcheck-ng.com HQ: Leeds, United KingdomReported employees: 51-200 | Leeds, United Kingdom | 51-200 | Exact match | 99 contacts → |
“AppCheck is a Complete Enterprise Security Testing Solution that provides up to the minute vulnerability coverage for your entire estate.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | White HAT An Epam Companywhite-hat-cyber.com HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 77 contacts → |
“White Hat, part of the EPAM group, is an award-winning cyber intelligence and offensive security company that leverages an attacker’s perspective to shape innovative, proactive…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Dionach By Nomiosdionach.com HQ: Oxford, United KingdomReported employees: 51-200 | Oxford, United Kingdom | 51-200 | Exact match | 73 contacts → |
“Dionach by Nomios has over 25 years of expertise in information security, supporting organisations in building resilience against ever‑evolving cyber threats.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | 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 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | MDSECmdsec.co.uk HQ: Macclesfield, United KingdomReported employees: 11-50 | Macclesfield, United Kingdom | 11-50 | Exact match | 61 contacts → |
“MDSec are a UK based consultancy with a passion for information security.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | 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 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Rootshell Securityrootshellsecurity.net HQ: Basingstoke, United KingdomReported employees: 51-200 | Basingstoke, United Kingdom | 51-200 | Exact match | 49 contacts → |
“Human-Led Continuous Testing.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Secforce LTDsecforce.com HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 39 contacts → |
“SECFORCE are vendor independent offensive security specialists providing effective business risk intelligence and strategic security consulting.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Onsecurityonsecurity.io HQ: Bristol, United KingdomReported employees: 51-200 | Bristol, United Kingdom | 51-200 | Exact match | 39 contacts → |
“OnSecurity offers CREST-accredited AI Augmented Penetration Testing, all whilst harnessing technology to simplify the management and delivery of pentesting.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Secarma LTDsecarma.com HQ: Manchester, United KingdomReported employees: 11-50 | Manchester, United Kingdom | 11-50 | Exact match | 36 contacts → |
“Secarma exists to keep the world safe.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | The Secops Groupsecops.group HQ: Cambridge, United KingdomReported employees: 11-50 | Cambridge, United Kingdom | 11-50 | Exact match | 34 contacts → |
“Pentesting Exams by Pentesting Experts.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | 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 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Aristiaristi.co.uk HQ: Birmingham, United KingdomReported employees: 11-50 | Birmingham, United Kingdom | 11-50 | Exact match | 32 contacts → |
“Aristi is a specialist provider of cyber security services with over 17 years of experience.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Cyberwarfare Labscyberwarfare.live HQ: Cambridge, United KingdomReported employees: 11-50 | Cambridge, United Kingdom | 11-50 | Exact match | 32 contacts → |
“CyberWarfare Labs (CWL) is a global cyber security education platform on a single mission, making practical cybersecurity Accessible, Affordable, and Unstoppable.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Salus Cybersaluscyber.com HQ: Cheltenham, United KingdomReported employees: 11-50 | Cheltenham, United Kingdom | 11-50 | Exact match | 31 contacts → |
“Salus is a provider of world-class cyber security services, enabling our clients to identify and manage their cyber risks proactively and effectively.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Citation Cybercitationcyber.com HQ: Lancaster, United KingdomReported employees: 11-50 | Lancaster, United Kingdom | 11-50 | Exact match | 30 contacts → |
“Cyber security can feel overwhelming.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Procheckup PCUprocheckup.com HQ: Portsmouth, United KingdomReported employees: 11-50 | Portsmouth, United Kingdom | 11-50 | Exact match | 29 contacts → |
“Imagine a world where cyber threats are simply another challenge that you're fully equipped to handle.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Cyber Security Specialistscybersecurityspecialists.co.uk HQ: Altrincham, United KingdomReported employees: 11-50 | Altrincham, United Kingdom | 11-50 | Exact match | 26 contacts → |
“Based in Manchester UK, we are an independent Cyber Security Consultancy providing Security services across a wide range of markets, from multi-national Corporate Organisations…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | 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 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Cybercrowdcybercrowd.co.uk HQ: Newbury, United KingdomReported employees: 11-50 | Newbury, United Kingdom | 11-50 | Exact match | 23 contacts → |
“CyberCrowd are a market leader in the cyber security realm, offering everything from Assessment Services through to Pen Testing, CISOaaS, Certification Readiness, DPO services…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | 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 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Chaleitchaleit.com HQ: Cambridge, United KingdomReported employees: 11-50 | Cambridge, United Kingdom | 11-50 | Exact match | 21 contacts → |
“Chaleit is a cyber security management consultancy that aligns business context with real-world capability to solve complex risks.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | 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 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Razorthorn Securityrazorthorn.com HQ: Tunbridge Wells, United KingdomReported employees: 11-50 | Tunbridge Wells, United Kingdom | 11-50 | Exact match | 19 contacts → |
“Razorthorn Security is a specialist cybersecurity consultancy founded in 2007, with nearly two decades of experience helping organisations protect their data, their systems and…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
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Offensive security testing providers: dataset insights
September 29, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
308 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.
Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 308 companies.
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.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
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 29, 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 ↗
Offensive security testing providers by metro
Questions about this company list
What does Exact match mean for offensive security testing providers?
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 offensive security testing providers did RevenueBase find based in the United Kingdom?
The saved snapshot records 308 matching company records, 3,878 tracked contacts and 907 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 29, 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
Offensive security testing providers by geography
- Offensive security testing providers based in Melbourne, Australia
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- Offensive security testing providers based in Toronto, Canada
- Offensive security testing providers based in Paris, France
- Offensive security testing providers based in Ahmedabad, India
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- Offensive security testing providers based in New York, United States
- Offensive security testing providers based in San Francisco, United States
- Offensive security testing providers based in Australia
- Offensive security testing providers based in Austria
Cite this list
RevenueBase Data Team. Top 25 offensive security testing providers based in the United Kingdom. Snapshot: September 29, 2026. https://revenuebase.ai/companies/offensive-security-testing-providers/united-kingdom.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
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- Offensive security testing providers based in Melbourne, Australia
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