Find a Pentest Company in United Kingdom
There are 333 penetration testing companies in United Kingdom. 78% are small firms (50 or fewer employees) and 22% are larger organizations.
4ARMED
Cybersecurity company specializing in CREST-certified penetration testing, consultancy, and training; based in the United Kingdom with 2 employees and $2,002 annual revenue; focuses on securing cloud-native, web, mobile, and network environments.
North IT | Pen Testing Specialists
Cybersecurity company specializing in penetration testing and application security; 5 employees with 25% monthly and yearly growth; founded in 2012; based in Middlesbrough, UK.
MDSec
MDSec is a UK-based private cybersecurity consultancy specializing in adversary simulation, application security, penetration testing, incident response, research, training, and technical security; with 38 employees (+1.7% YoY growth), $1M annual revenue, founded in 2011, and recognized for expertise in application, mobile, and hardware security, and targeted red team attacks.
Adversify
Adversify is a UK-based boutique cybersecurity consultancy specializing in penetration testing; CREST-accredited with 2 employees, founded in 2022, headquartered in York, England. The company offers comprehensive security assessments, focusing on application and network security, with a strong emphasis on high-quality, specialized services.
You Gotta Hack That
Cybersecurity consultancy specializing in penetration testing and IoT security; founded in 2017, based in Manchester, UK, with 2 employees and 200% YoY growth; provides services including web, mobile, internal, external, and wireless network penetration testing, with 1,571 monthly visits and ranked #10,597,252 globally.
Exosec Limited
Exosec Limited is a UK-based IT services and cybersecurity consulting firm specializing in penetration testing, red teaming, and security assessments; with 3 employees, founded in 2019, it emphasizes deep technical expertise and a client-first approach in cybersecurity.
Cyber Armed Security
UK-based private IT security company founded in 2020; specializes in penetration testing, bug sweeping, phishing, and intelligence operations; 8 employees; operates in cybersecurity, ethical hacking, open source intelligence, and secure code review; aligned with UN resolutions.
Stop wasting time on security questionnaires
ResponseHub uses AI to automate your security questionnaire responses. 100% confidence, save days, unblock deals.
Securebytes® Solutions Ltd
UK-based cybersecurity firm with 2 employees; specializes in penetration testing, ethical hacking, and cybersecurity consulting; CREST registered penetration testers with extensive industry experience; actively engaged in cybersecurity services and social media presence.
Precursor Security
UK-based cybersecurity company specializing in CREST-certified penetration testing and offensive security services; 20 employees with 29.6% YoY growth; founded in 2018; operates a 24/7 UK SOC; ranked #10,195,298 globally with 1,588 monthly website visits; offers tailored cybersecurity solutions, edge protect tools, and active threat simulation.
Fortifi Cyber
Cybersecurity company specializing in CREST-accredited penetration testing; offers network, web, mobile, and red & purple teaming services; founded in 2022, 5 employees, based in Harpenden, UK; 50% YoY growth, global rank #10,785,117, with 1,118 monthly website visits.
Pentest People
UK-based security consultancy specializing in Penetration Testing as a Service (PTaaS); 76 employees with 20.2% YoY growth; offers web application and network penetration testing, simulating attacks to identify vulnerabilities; active in cybersecurity market with recent focus on security testing and cyber risk analysis.
SecureTeam Ltd
UK-based cybersecurity consultancy founded in 2016; 6 employees with -8.3% YoY growth; specializes in penetration testing, security hardening, Red Team assessments, incident response, and forensics; headquartered in London, UK; provides network & application penetration testing, secure configuration review, and cybersecurity advisory services.
Realize Security
Cybersecurity company specializing in penetration testing and security assurance; CREST-approved and UKAS-accredited; 2 employees with +200% YoY growth; headquartered in London, UK.
Rootshell Security
Rootshell Security is a UK-based private IT & Services company specializing in vulnerability management and penetration testing; 35 employees with 1.9% YoY growth, founded in 2019, headquartered in Basingstoke, UK. It is a leading provider of Penetration Testing as a Service (PTaaS), combining innovative technology with seasoned professionals to deliver vendor-agnostic security solutions and continuous threat exposure management.
Advertise on pentest.fyi
You could be here!
Moztech Security
Cybersecurity consultancy specializing in penetration testing, ethical hacking, and vulnerability assessments; 4 employees; Founded 2019; Chesterfield, UK. Provides IT security testing services to improve client cyber resilience.
Black Belt Security LLC
Cybersecurity consultancy based in the United Kingdom; specializes in penetration testing, vulnerability assessments, static code reviews, and cloud security with 9 employees, founded in 2019, and a focus on delivering premium security services.
Redscan, A Kroll Business
Cybersecurity company specializing in managed detection, penetration testing, and incident response; 42 employees, $11.5M revenue, founded 2002 in London, UK; provides explicit penetration testing services including web app testing and ethical hacking.
OALO Security
Cybersecurity company specializing in penetration testing for websites, mobile applications, and IT systems; founded in 2019 with 2 employees, headquartered in the United Kingdom. Focuses on vulnerability assessment and security improvement guidance.
Sentrium Security
UK-based cybersecurity consultancy founded in 2018; 4 employees with 16.7% YoY growth; CREST-approved provider specializing in application, cloud, and penetration testing services, offering comprehensive vulnerability assessments and risk reduction.
BlackBox Pentesters
BlackBox Pentesters is a UK-based cybersecurity firm specializing in penetration testing and information security services; founded in 2025 with 3 employees, it emphasizes simplifying cybersecurity and offers services including red teaming, social engineering, physical, cloud, application, and wifi penetration testing.
OnSecurity
Cybersecurity company specializing in penetration testing and security assessments; 34 employees; founded 2018; Bristol, UK; $14M funding; offers web, cloud, infrastructure testing, phishing, social engineering, physical penetration, and vulnerability scanning.
SecQuest - a NCSC Assured Service Provider
UK-based cybersecurity consultancy specializing in penetration testing and security assessments; offers CHECK & CREST services with a team of 9 employees; founded in 2012; provides network, application, and infrastructure security testing, with 7,422 monthly website visits and a global rank of 2,835,237.
Appsecco
UK-based private cybersecurity company specializing in application and cloud security testing; 6 employees, founded 2015, last seed funding in 2016, with a focus on penetration testing, vulnerability assessments, and secure software development. They serve clients across industries with expert security testing and actionable insights.
FORTBRIDGE
Cybersecurity company specializing in penetration testing and security assessments; offers mobile, web, API, and network pentesting, cloud security review, red teaming, and security architecture; 5 employees; Founded 2020; London, UK.
Carapace
Cybersecurity company specializing in penetration testing and security assessments; offers external/internal network testing, wireless security, and physical security reviews; founded 2023; 5 employees; headquartered in United Kingdom.
Forfend Information Security
Cybersecurity consultancy based in Birmingham, UK; 4 employees with 33.3% YoY growth since 2022; specializes in penetration testing, application security, and wireless network testing, emphasizing comprehensive support and client engagement.
Tradecraft
Tradecraft is a UK-based IT services and cybersecurity consultancy founded in 2017 with 4 employees; it specializes in adversary simulation and vulnerability exploitation, providing penetration testing-like security assessments. The company is registered in England & Wales (Company No. 10984430) and operates from London, with a focus on security testing and cyber defense services.
XRAY CyberSecurity
UK-registered private cybersecurity firm specializing in penetration testing; offers external/internal network pentests, application testing, and social engineering; 6 employees; founded 2013; headquartered in London, UK; internationally certified with active social media presence.
Akimbo Core
Akimbo Core is a UK-based cybersecurity firm founded in 2021, with 4 employees specializing in penetration testing, cybersecurity training, and consultancy; it has a growing online presence with 3,422 monthly visits and a global rank of #4,513,234.
Stop wasting time on security questionnaires
ResponseHub uses AI to automate your security questionnaire responses. 100% confidence, save days, unblock deals.
Foregenix
UK-based IT services and cybersecurity company specializing in penetration testing, forensics, and compliance; 60 employees, $9.9M revenue, founded 2009, headquartered in Swindon, UK; offers network, web, mobile, wireless, and cloud penetration testing services, with recent activity including collaborations and spin-outs.
Cyndicate Labs
UK-based cybersecurity consultancy specializing in penetration testing and red teaming; 6 employees with 28.6% YoY growth, founded in 2020, headquartered in Birmingham, UK. Offers web application testing, cyber scheme assessments, and cybersecurity consulting; 8,000 monthly website visits, ranked #2,039,956 globally.
Pentest Limited
Cybersecurity company specializing in penetration testing, red teaming, and consultancy services; 21 employees, $9.7M annual revenue, founded 2001 in Altrincham, UK; offers tailored testing, compliance, workshops, and research activities, with a global web rank of #3,838,798 and 4,379 monthly visits.
Circumvensys
UK-based private cybersecurity firm specializing in penetration testing, vulnerability assessments, and managed security services; 2 employees with stable operations and a focus on network and application security testing.
In.security
Cybersecurity consultancy based in the UK; specializes in penetration testing, red team testing, vulnerability assessments, and cybersecurity training; 3 employees; founded 2018; provides technical security testing and awareness services to organizations.
Trethtec Ltd
UK-based cybersecurity firm specializing in penetration testing services such as web application, API, internal, and cloud assessments; offers single and ongoing engagements with active exploitation to identify security vulnerabilities.
Securityium
Securityium Ltd is a UK-based cybersecurity firm specializing in penetration testing and vulnerability assessments; with 2 employees and a 57.1% YoY workforce decline, it focuses on high-security testing services for enterprise clients. Founded in 2020 and headquartered in London, it maintains a modest online presence with 2,219 monthly visits and a global rank of #6,583,875.
Pentiq
Cybersecurity company specializing in penetration testing and vulnerability assessments; based in London, UK, with 7 employees, founded in 2016. Offers ethical hacking, social engineering, security training, and compliance services, with active social media presence and a focus on secure testing environments.
Incursion Cyber Security
Incursion Cyber Security is a UK-based cybersecurity consultancy specializing in penetration testing, security audits, and cyber training; founded in 2022, with 3 employees and a focus on enhancing network security for mid-market clients. They are a highly accredited, boutique firm with a strong emphasis on business-focused security services.
Dhound.io
Dhound.io is a UK-based cybersecurity firm specializing in manual web and mobile application penetration testing; 3 employees, founded 2015, headquartered in Leeds, with a focus on detecting suspicious activity to prevent attacks. It has a rapid growth rate (+50% monthly) and a modest web presence with 1,316 monthly visits.
Securewinds
UK-based cybersecurity firm with 2 employees; specializes in consultancy, penetration testing, and security assessments for digital assets and infrastructure; provides web application penetration testing and cloud security services; headquartered in London, UK.
Heretek
Cybersecurity company based in the United Kingdom; specializes in penetration testing for infrastructure, web applications, and APIs, with 3 employees and 33.3% YoY growth; founded in 2023, with a focus on digital transformation, cloud engineering, and IT consultancy.
Cyber Alchemy Ltd.
Cyber Alchemy Ltd. is a UK-based cybersecurity company founded in 2023 with 3 employees; specializes in assessment, penetration testing, red team exercises, cloud assessment, and consultancy; also provides remediation training, ethical hacking, and cyber awareness training; focuses on improving clients' security posture; web presence includes 7,108 monthly visits and a global rank of 2,136,249; core service includes penetration testing.
Pen Test Partners
Cybersecurity company specializing in penetration testing services across networks, applications, and cloud; 67 employees, $6.1M revenue, founded 2010, based in Buckingham, UK; recognized for expertise in red teaming, testing, and security consulting, with 28,414 monthly website visits and global rank #1,041,359.
Razorthorn Security
Cybersecurity consultancy specializing in penetration testing, compliance, and consulting; 14 employees with -10.5% YoY growth; CREST-accredited pentesting across infrastructure, wireless, web, and mobile; Recognized by Gartner; Founded 2007; Tunbridge Wells, UK.
Mobius Binary
IT services company specializing in cybersecurity penetration testing; provides internal and external penetration testing, web app testing, vulnerability assessments, and OSINT; 8 employees; Founded 2021; Bath, UK.
Sencode Cyber Security
UK-based private cybersecurity company specializing in penetration testing and security consultancy; offers web, mobile, and infrastructure pentest services, CREST-accredited, with 2 employees, founded in 2019, headquartered in Middlesbrough, UK. Provides comprehensive cybersecurity solutions with a pioneering approach to modern security and OSINT challenges.
Bruce & Butler
Cybersecurity company specializing in penetration testing, vulnerability assessments, and audits; 8 employees with 15.4% YoY growth; founded 2015; Sheffield, UK; provides CREST-accredited penetration testing services and data protection solutions for UK and international clients.
Salus Cyber
Cybersecurity company based in the United Kingdom; specializes in penetration testing, incident response, data protection, and security strategy; 25 employees with 9.4% YoY growth; founded in 2017; offers comprehensive security services including ethical penetration testing and compliance testing.
Cybercontrols.io
Cybercontrols.io is a UK-based infosec consultancy providing cybersecurity and compliance services, including penetration testing, internal audits, and endpoint security; founded in 2022, with 4 employees and +300% YoY growth, headquartered in Morpeth, UK.
Mollis Group
UK-based IT services and consulting company founded in 2019; specializes in cloud cybersecurity, penetration testing, ethical hacking, security architecture, and digital transformation; 3 employees; headquartered in London, UK; provides professional penetration testing services as explicitly stated on their website.
CyberCrowd
CyberCrowd is a UK-based IT services and cybersecurity company founded in 2016, with 18 employees and a 30.8% YoY growth. It specializes in penetration testing, assessment services, and cyber security consulting, serving clients with comprehensive vulnerability evaluations, web and mobile app testing, and certification readiness. The firm is a market leader in cyber security assessment, with a strong web presence and active recent activity in industry news.
C360RED
IT system testing and evaluation company specializing in penetration testing; based in United Kingdom; 2 employees; founded 2025; focuses on web and network security testing, emphasizing transparency and affordability.
RM Information Security
RM Information Security is a UK-based private cybersecurity consultancy specializing in penetration testing and information security. Founded in 2015 and employing 6 staff, they focus on expert, communication-driven services with active penetration testing offerings, including application security and vulnerability exploitation. They are headquartered in Manchester, UK, with a modest online presence of 1,068 monthly visits and a global rank of approximately 12.7 million.
th4ts3cur1ty.company
Cybersecurity company specializing in penetration testing, purple team, GRC, and cyber strategy; UK-based with 10 employees, founded in 2019, offering straightforward, no-nonsense support and international services. Focuses on providing clear, technical cybersecurity solutions with a small, dedicated team.
CYBER I UK
Cyber I UK is a UK-based private cybersecurity company specializing in penetration testing, assurance, and incident response; 4 employees, founded in 2000, with a UK domain and contact details, and 847 monthly website visits.
One Compliance Cyber Limited
Cybersecurity company based in the United Kingdom; specializes in penetration testing, red team testing, vulnerability assessments, incident response, and data privacy consulting; 15 employees with 6.3% YoY growth; founded 2018; focuses on data privacy and cyber security services for businesses.
Ruptura InfoSecurity
UK-based IT services and cybersecurity company specializing in CREST & CHECK Approved Penetration Testing; 8 employees, 7.7% YoY growth, founded 2020, operates in a competitive global market with a modest web presence and active social media engagement.
ThreatMatrix
ThreatMatrix is a private cybersecurity firm headquartered in Manchester, UK, with 3 employees; it offers comprehensive security services including penetration testing, web security, data security, network security, endpoint security, forensic analysis, and phishing training, emphasizing its focus on safeguarding digital assets and infrastructure.
RandomStorm Ltd
UK-based network security company providing enterprise security management tools and penetration testing services; employs 4 people, founded 2007, with $2.5M annual revenue; headquartered in United Kingdom.
Cyberis
Cyberis is a UK-based cybersecurity consultancy headquartered in Tewkesbury, Gloucestershire; specializes in information security with a focus on penetration testing, incident response, and simulated targeted attacks. The firm is CREST-accredited, demonstrating recognized expertise and compliance in penetration testing services.
Advertise on pentest.fyi
You could be here!
Cyro Cyber
Cybersecurity company based in London, UK; provides penetration testing (pentest) services including PenTest-as-a-Service and offensive security testing; headquartered in London, England.
Surecloud Cyber Services
Cybersecurity company based in Gloucester, UK; specializes in penetration testing, including infrastructure and cloud security testing, with active vulnerability assessment and attack simulation capabilities.
CODA Security
Cybersecurity consultancy specializing in computer and network security; founded 2017, 4 employees, based in Leamington Spa, UK. Offers penetration testing, risk management, vulnerability assessment, and bespoke cybersecurity services; emphasizes high-quality, client-focused solutions and invests heavily in personnel.
R & I Consulting
UK-based IT services and cybersecurity consulting firm founded in 2017; specializes in penetration testing and vulnerability assessments with 3 employees and headquartered at 5 Freeman Close, Castle Hill, Ebbsfleet Valley, DA10 1BY, UK.
Secarma Ltd
Cybersecurity company specializing in penetration testing services; based in Manchester, UK, with headquarters at 3 Archway, Birley Fields, Manchester, M15 5QJ; UK registered company number 04217114; explicitly offers penetration testing and cybersecurity assessments.
Amr Cybersecurity
UK-based cybersecurity company providing penetration testing services with CREST accreditation; employs vetted, certified security experts for tailored testing, reporting, and post-engagement support.
CODA Security Limited
UK-based cybersecurity consultancy specializing in bespoke services; offers penetration testing, vulnerability assessments, and risk management with experienced principal-led teams. Headquartered in Leamington Spa, Warwickshire.
CSaaS
UK-based cybersecurity company operating from csaas.uk; specializes in penetration testing, including external/internal infrastructure assessments and attacker-modeled testing for ICS environments, with explicit service offerings listed on their website.
CDEC Ltd
UK-based IT services and cybersecurity consultancy with 3 employees and +60% YoY growth; specializes in penetration testing, security audits, incident response, and bespoke hardware solutions; registered in England and Wales (Company No. 10292654), headquartered in London, with 2,161 monthly website visits and a global rank of #8,464,690.
Mobius Consulting
UK-based cybersecurity company specializing in penetration testing and security assessments; listed on UK Companies House with registration numbers 13538454 and 06958601; offers comprehensive security testing including penetration testing and vulnerability scanning.
Conseal Security Ltd
Cybersecurity company specializing in penetration testing for Android, iOS, and web apps; 3 employees with 50% YoY growth; based in London, UK; offers affordable security testing, code analysis, and legacy product assessments.
Cyphere Ltd
UK-based cybersecurity firm specializing in penetration testing; headquartered in Greater Manchester with a registered office in Altrincham, UK; offers CREST-accredited security testing services.
Cyber Defence Ltd
Cyber Defence Ltd is a UK-based cybersecurity firm specializing in modern security operations, threat intelligence, and penetration testing; offers goal-driven pentest services across diverse environments, supported by CREST accreditation, and operates primarily in the UK and Europe.
Cloudpush
IT services and consulting firm based in London, UK; specializes in cybersecurity, penetration testing, managed IT, and cloud solutions; 2 employees, founded 2020; provides comprehensive cybersecurity services including penetration testing, security awareness, and network security.
IP Overwatch Ltd
Cybersecurity firm based in the UK; offers penetration testing and vulnerability assessments; utilizes advanced technology to identify vulnerabilities and mitigate cyber risks.
Nextgen Cyber
UK-based cybersecurity firm specializing in penetration testing, security assurance, red team simulations, and social engineering tests; located in Barnet, London, with UK registration at Companies House.
Cyberlab
CyberLab is a UK-based cybersecurity firm specializing in penetration testing services; it explicitly offers penetration testing as a core service and is headquartered at Bridgford House, Heyes Lane, Alderley Edge, SK9 7JP.
Toro Solutions
UK-based security and investigations company founded in 2015, with 13 employees and a focus on cyber, physical, and personnel security. Known for creating the UK's first Red Team penetration test, it provides active penetration testing, cyber attack simulation, and security consultancy services, serving government and business clients globally.
Hackyde Limited
UK-based cybersecurity company specializing in penetration testing; led by professionals with 23+ years of experience; holds CREST and OSCP certifications; based in Birmingham, UK.
Risk Crew
UK cybersecurity firm specializing in penetration testing; CREST-accredited with comprehensive testing services including detailed reports and retesting; registered at Phoenix House, Smeaton Close, Aylesbury, Buckinghamshire, England HP19 8UW.
3ct Security
UK-based cybersecurity firm specializing in penetration testing services; headquartered in Malvern, Worcestershire, with verified operations in the UK. Provides security assessments including vulnerability management and maturity evaluations.
Equilibrium Security
UK-based private cybersecurity firm founded in 2012; specializes in penetration testing, cyber essentials, cyber awareness, and phishing simulations; 2 employees with -73.3% YoY growth; 3,019 monthly visits; competes with Marco Technologies, Convergence Networks, and Trustwave.
Red Team Partners
UK-based private cybersecurity company founded in 2015; 23 employees with 20.7% YoY growth; specializes in penetration testing, cloud security, and cybersecurity consulting; headquartered in London, England.
NormCyber
UK-based cybersecurity firm specializing in CREST-certified penetration testing services; offers active vulnerability identification and remediation through authorized cyber-attack simulations; headquartered in Fareham, England, with a registered office at 8 Barnes Wallis Road.
Azacus.io
Cybersecurity company specializing in penetration testing, vulnerability assessments, and offensive security services; based in the United Kingdom with 2 employees, founded in 2018. Provides web application testing, infrastructure testing, and pentesting program management to assess and improve security posture.
Clear Cut Cyber Ltd
UK-based cybersecurity firm with headquarters in London; provides penetration testing services confirmed by website content and third-party documentation; active in offensive security testing.
Genius Security
UK-based IT services and cybersecurity consulting firm specializing in penetration testing (Black/White Box), web application testing, network vulnerability assessments, and cyber forensics; founded in 2018 with 2 employees, headquartered in Beaconsfield, Buckinghamshire.
Secure Impact Ltd
UK-based cybersecurity consultancy; offers penetration testing, incident response tabletop exercises, and offensive security services; specializes in bespoke, interactive assessments for global SaaS providers and enterprises.
InfoSec Governance
UK-based cybersecurity firm specializing in cybersecurity education, protection, and penetration testing; offers web application pentests and security consulting; registered in England and Wales (Company No. 12289766); headquartered in Darlington, UK.
Moore Clearcomm
Cybersecurity firm based in London, UK, providing penetration testing and cyber resilience services; explicitly lists penetration testing as a core offering, emphasizing security testing and vulnerability assessment capabilities.
Agile Security
Cybersecurity company providing end-to-end security solutions with expertise in penetration testing for web and infrastructure; based in London, UK, with presence in India, US, and Australia; founded 2015; 3 employees (+12.5% YoY).
Bulletproof (Cyber Security)
UK-based private cybersecurity firm with 96 employees (+0.8% YoY growth), $3.0M annual revenue; specializes in penetration testing, data protection, and compliance services; registered at 20 Grosvenor Place, London, and based in Stevenage, Hertfordshire; ranks #1,574,985 globally and #154,108 in the UK; active in cybersecurity & compliance categories including ISO 27001, SOC 2, GDPR, and red team assessments.
JASPER ENTERPRISES LIMITED
JASPER ENTERPRISES LIMITED is a UK-based private financial services firm with 7 employees and +40% YoY growth; they specialize in cybersecurity, including penetration testing, incident response, dark web monitoring, and cyberrange security, with over 10 years of expertise in safeguarding medium-sized and international companies.
Wolf Network Security Ltd
UK-based cybersecurity company specializing in penetration testing; offers testing of web applications and infrastructure using automated and manual exploitation tools; registered in England and Wales with company number 10635866, located at 47 Lloyd Street, Manchester.
Orpheus Cyber
UK-based cybersecurity company specializing in threat intelligence, risk management, and penetration testing; CREST-accredited for simulated targeted attack and response services; 18 employees, $8M annual revenue, founded in the UK, with a focus on cybersecurity consulting and threat mitigation.
Cybx Ltd
UK-based cybersecurity company specializing in digital resilience and penetration testing; offers ethical hacking and security assessment services; headquartered in Worcester, England.
Secure360.io
UK-based cybersecurity provider in Inverurie, Scotland; offers enterprise-grade managed security services for SMBs with 24/7 protection and monthly penetration testing, emphasizing proactive threat mitigation.
Hydras
UK-based cybersecurity firm Hydras IT Limited specializes in penetration testing and cloud security services; offers AWS web application penetration tests with simulated cyberattacks, active testing, and detailed reporting. Operates from London and Burgess Hill, serving clients with security engineering expertise.
Amberwolf
UK-based cybersecurity company specializing in penetration testing, attack simulation, and red teaming; CREST-accredited for Threat Intelligence Led Penetration Testing STAR-FS assessments; trusted by governments and security leaders globally; founded in London, UK.
𝐍𝐞𝐭𝐟𝐨𝐫𝐭𝐞 𝐂𝐨𝐧𝐬𝐮𝐥𝐭𝐢𝐧𝐠 𝐋𝐭𝐝
Cybersecurity solutions company specializing in advanced penetration testing services; based in London, UK, founded in 2023, with 2 employees and 100% YoY growth. Focuses on safeguarding digital assets and fortifying defenses against cyber threats.
Talion Cyber Security
Cybersecurity company specializing in hybrid cybersecurity services and penetration testing; 94 employees with 3.3% YoY growth; founded in 2020; based in Camberley, UK. Known for providing defense-grade cybersecurity solutions and explicit penetration testing services, with a focus on identifying vulnerabilities through simulated attacks.
HexaTrace
Cybersecurity company based in Derby, UK, founded in 2024 with 2 employees; specializes in security frameworks, threat detection, incident response, and ethical hacking services including penetration testing, web/mobile/app/network/cloud security audits, and social engineering; offers active exploitation and simulated real-world attack testing.
Pragma
Cybersecurity company specializing in penetration testing, security testing, and digital forensics; CREST approved provider with $1.5M annual revenue and 2 employees based in the UK, serving high-profile clients with a pragmatic approach to cyber resilience.
Cynance
Cybersecurity and network security consulting firm based in London, UK; 7 employees with 50% YoY workforce decline; specializes in penetration testing, ethical hacking, and application security testing to identify vulnerabilities and enhance defenses; trusted by organizations across UK, EU, and worldwide.
EBC Group
UK-based private IT services and consulting firm founded in 1989; 52 employees, $10M revenue; specializes in managed IT, cloud, cybersecurity, and connectivity solutions; partners with UK businesses to enhance security and operational efficiency; offers CREST-approved penetration testing services in collaboration with Assure Technical.
AnchorSec
UK-based cybersecurity research and consulting firm specializing in penetration testing; offers infrastructure, web, mobile, and cloud security assessments with a focus on offensive security techniques; registered in Manchester, UK.
PrimoConnect: Compliance Support - Cyber Security - Pen Testing - Cloud - Networks
UK-based private IT security company founded in 2017 with 2 employees; specializes in penetration testing, cloud infrastructure, and compliance support. Offers offensive security testing, cyber awareness training, and secure cloud/network design, with explicit focus on penetration testing services and cyber security consultancy.
Mandalorian
Cybersecurity company based in Caterham, Surrey, United Kingdom; specializes in enterprise information security consultancy, including penetration testing and incident response; employs 2 people, founded 2005; serves public and private sectors across EMEA and Asia-Pacific.
CovertSwarm
Cybersecurity company specializing in penetration testing, ethical hacking, and red teaming; 44 employees with 10.5% YoY growth; launched a free Offensive Operations Center for the energy sector in 2023 • 2020-founded; London, UK; Private company.
GoAllSecure
GoAllSecure is a UK-based private cybersecurity services provider specializing in penetration testing, red team exercises, and comprehensive security solutions. Founded in 2021, it has 9 employees with 50% YoY growth, offering services across website, API, cloud, server, and mobile security to global clients. The company emphasizes offensive security with active penetration testing and assurance offerings, serving both government and private sectors worldwide.
Node4
UK-based IT services and consulting company with 529 employees, $86.8M revenue, specializing in infrastructure, cloud, colocation, and cybersecurity; offers CREST-certified penetration testing and maintains strong vendor relationships, with 23,324 monthly web visits and a global rank of #1,197,953.
ThreatSpike
Cybersecurity company specializing in managed security services and penetration testing; offers unlimited penetration testing and system-specific assessments, with 47 employees, $10M revenue, founded in 2011, based in the UK, with $26.3M in funding.
UK Cyber Security Group Ltd
UK Cyber Security Group Ltd is a UK-based private cybersecurity firm specializing in IT network security and penetration testing services; founded in 2019, with 1 employee, it emphasizes data protection, security awareness, and compliance, serving clients across the UK.
iSTORM® Privacy - Security - Pentesting Consultancy
UK-based IT services and consulting firm specializing in privacy, security, and penetration testing; CREST-approved provider with 6 employees, founded in 2018, focusing on simplifying standards compliance and offering real-world security solutions. Maintains 1,806 monthly web visits and ranked #8,654,171 globally.
FoxTech Cyber
Cybersecurity company based in the United Kingdom; specializes in managed cybersecurity services including vulnerability management, security monitoring, and penetration testing for SMEs. Offers a Managed SOC platform with integrated vulnerability management, security monitoring, and pen-testing; 8 employees, founded 2020, +16.7% YoY growth.
Aardwolf Security
Cybersecurity company specializing in penetration testing; UK-based with a focus on web, network, and cloud security assessments, adhering to OWASP standards; 1 employee; Monthly visits: 30,811; Global rank: #895,021.
NCC Group
UK-based IT services and cybersecurity consulting company; specializes in penetration testing, security assessments, and managed security services with 1,161 employees and $412.5M annual revenue. Operates globally with a focus on cyber resilience, responsible business, and sustainability; founded in 1999, market cap GBP 506.6M.
DigitalXRAID
Cybersecurity company specializing in penetration testing and security services; provides CREST-accredited web and internal penetration testing with active attack simulation capabilities; based in the United Kingdom with 39 employees and $8.6M annual revenue.
Codigo Security
UK-based cybersecurity consulting company founded in 2018 with 2 employees; specializes in web application security, cloud security, and penetration testing; explicitly offers manual web application penetration testing aligned with OWASP, NIST, and SANS standards; registered at 71-75 Shelton Street, Covent Garden, London.
SECFORCE LTD
Cybersecurity consultancy specializing in offensive security assessments; provides penetration testing, red teaming, and security consulting with 29 employees, $27.3M revenue, founded in 2008, based in United Kingdom • Industry: Computer and Network Security; Founded 2008; 29 employees; Revenue: $27.3M; Headquarters: UK; Recognized for expertise in penetration testing, threat modeling, exploit development, and vendor-independent security assessments.
Clearfin Security
Cybersecurity company specializing in penetration testing, vulnerability assessment, phishing campaigns, and digital infrastructure security; based in London, UK, with 3 employees, focusing on affordable, effective security services for organizations.
Punk Security Limited
UK-based IT services and consulting company specializing in DevSecOps, cybersecurity, and cloud engineering; 6 employees, founded 2021, with a focus on penetration testing, governance support, and cloud security services.
Closed Door Security
UK-based private cybersecurity company specializing in penetration testing, security assessments, engineering, and certification; CREST-accredited, partner of SBRC & Police Scotland, with 4 employees and 33.3% YoY growth; actively promotes penetration testing services through dedicated pages and certifications.
Cognisys
UK-based IT services and cybersecurity company specializing in penetration testing, security assessments, and compliance; 63 employees with 95.5% YoY growth; founded in 2017; CREST-accredited penetration testing services; headquartered in Leeds, UK.
DefenseLabs
UK-based private cybersecurity firm specializing in offensive security and penetration testing; offers adversary emulation, exploit development, threat modeling, vulnerability research, and AI-driven attack simulations; founded in 2025 with 2 employees; headquartered in London, UK.
Fidus Information Security
Fidus Information Security is a UK-based private cybersecurity company specializing in penetration testing and network security solutions; 4 employees, $5M revenue, founded 2017 in Cambridge, UK. They offer advanced pentest services, network and IoT security, and serve diverse sectors including public, legal, and healthcare.
Paul Reynolds Cyber Security
Cybersecurity firm based in Solihull, UK, with additional operations in Dubai, UAE; provides penetration testing (pentest) services including PTaaS and certified testing teams, emphasizing offensive security expertise.
Aptive Cyber Security
UK-based cybersecurity consultancy founded in 2011; specializes in penetration testing, vulnerability assessments, security hardening, and network security audits; serves UK and global clients; 15,008 monthly visits; global rank #1,649,321.
LRQA
UK-based risk management and certification company with 2,098 employees and $750.5M revenue; provides penetration testing services including CREST-certified and web application testing, with a focus on cybersecurity and quality assurance.
A-listware
A-listware is a UK-based IT services and consulting firm with 29 employees, founded in 2017, specializing in remote engineering teams and cybersecurity, including penetration testing services with CREST accreditation; operates an R&D center in Ukraine and offers expertise in multiple programming languages and technologies.
Bramfitt Tech Labs
UK-based cybersecurity consultancy specializing in CREST-certified penetration testing services; recognized as a global provider of CREST-certified penetration tests, with a focus on cyber resilience and innovation.
Total Group International
UK-based private company in computer networking and cybersecurity; 14 employees, $3.6M revenue, founded 2000; offers IT security, support, cloud, and penetration testing services (TotalPenTest) with active case studies and dedicated solutions.
QinetiQ
British defence technology company based in Farnborough, Hampshire, UK; provides penetration testing services including CREST-certified security assessments and real-world attack simulations.
Jumpsec
UK cybersecurity firm Jumpsec Limited offers bespoke consultancy and CREST-certified penetration testing services, including application and threat-led pentests; based in London and Surrey, emphasizing technical excellence and expert-driven approaches.
Brigantia by Elovade
UK-based IT services and cybersecurity consulting company with 30 employees, founded in 1996; specializes in cybersecurity solutions, including penetration testing via Rootshell, and supports channel partners with recurring revenue growth; part of the Elovade Group, with a focus on security assessments, red team engagements, and managed services.
Resillion
UK-based IT services and consulting company specializing in quality engineering, cyber security, and media content; offers penetration testing services confirmed by NCSC CHECK certification, with 300 employees (+13.8% YoY growth), $25.4M annual revenue, and offices across North America, Europe, and Asia.
JAG SECURE®
IT services and consulting company specializing in cybersecurity and penetration testing; based in London, UK, with 1 employee; focuses on tailored security solutions and digital resilience.
Prism Infosec
Cybersecurity firm based in Cheltenham, UK, specializing in penetration testing, red teaming, and GRC services; provides assessments, testing, and response solutions to enhance security posture.
CyPro
CyPro is a UK-based private cybersecurity firm specializing in computer and network security, with 15 employees and 16.7% YoY growth since 2022. It explicitly offers penetration testing services that simulate attacks to uncover vulnerabilities, supporting high-growth companies in scaling their security capabilities and gaining client trust.
Blackfoot Cybersecurity
Cybersecurity company specializing in computer and network security, penetration testing, and compliance; 15 employees with +20.8% YoY growth; founded in 2008; headquartered in Welwyn Garden City, UK; offers services including installation, gas washing, ventilation, and equipment manufacturing; active in cyber security training and risk management.
Ascentor Ltd
Cybersecurity company specializing in cyber risk management, technical assurance, and penetration testing; 14 employees, $26.9M revenue, founded 2004 in West Malling, UK; offers CREST-certified pentest services, Cyber Essentials, and management consultancy, with a global ranking of #7,420,700 and UK rank #665,425.
Foresight Cyber
UK-based cybersecurity company specializing in penetration testing; offers dedicated pentest services as part of its cybersecurity assessments, with a registered London office at 71-75 Shelton Street, London WC2H 9JQ.
CyberProtect
CyberProtect is a UK-based cybersecurity firm providing advanced security solutions, including penetration testing, vulnerability assessments, and security simulations; headquartered in the United Kingdom with a focus on proactive vulnerability identification and defense enhancement.
Acora - IT, Cyber & AI
UK-based IT services and consulting company with 337 employees and $63.5M revenue; specializes in secure digital transformation and offers explicit penetration testing, red-teaming, and attack simulation services; operates in IT infrastructure, security, and cloud solutions.
CyberQ Group
CyberQ Group is a UK-based private cybersecurity firm specializing in cyber protection and penetration testing services; 27 employees, founded in 2017, with $6.3M in funding, providing 24/7 global support and known for a reactive, technology-driven approach to cybersecurity.
Dionach
Cybersecurity firm based in Oxford, UK, specializing in penetration testing and security assessments; CREST-accredited with a comprehensive suite of security services. Part of Nomios; founded in the UK.
Cyber Vigilance
Cyber Vigilance is a UK-based cybersecurity firm headquartered in Guildford, UK; specializes in penetration testing services that identify vulnerabilities in infrastructure and applications, including automated pentesting capabilities through Horizon3.ai partnership.
Exploitr
UK-based cybersecurity firm specializing in penetration testing services; officially registered in Newport, Wales (Companies House 15939324); holds CREST Pathway Accreditation, confirming recognized credentials in pentest services.
Cambridge Cyber Advisers
UK-based cybersecurity company specializing in penetration testing and red teaming; offers real-world vulnerability assessments and active testing services; headquartered in Cambridge, UK.
Kocho
UK-based cybersecurity firm specializing in Microsoft identity, security, and cloud solutions; offers penetration testing services and security consulting; registered in England and Wales (company number 04308824), with a London office.
.svg)
Aristi Limited
Cybersecurity company based in Birmingham, UK, specializing in CREST-certified penetration testing services; headquartered in Birmingham, West Midlands, UK.
SEC-TEC LIMITED
UK-based cybersecurity firm founded in 1999; specializes in penetration testing, PSN Health Checks, and InfoSec services; headquartered in Erith, Kent, with active operations serving organizations worldwide.
CyberFortis Consulting
UK-based IT and cybersecurity consulting firm specializing in penetration testing, threat intelligence, risk assessments, and compliance services; 4 employees; founded 2019; offers explicit pentest services; serves clients across UK, EU, Australia, New Zealand, and USA.
Cyber Sense
Cyber Sense is a UK-based private cybersecurity firm specializing in penetration testing services, including internal, web application, and API assessments, with CREST registered testers and proactive threat intelligence; 2 employees, +25% YoY growth, founded in 2020, headquartered in London, UK.
Firesand Ltd
UK-based cybersecurity firm specializing in security solutions and penetration testing; headquartered in Milton Keynes, Buckinghamshire, with a registered office in Newport Pagnell, UK; offers security design, development, strategy, and assurance services.
Mothax Ltd
Application security testing company specializing in web, API, and mobile app security; provides penetration testing, training, and security consultancy services across the UK. Based in Cromford, UK, founded in 2012, with 1 employee, led by Gareth Watkin-Jones.
Secore Information Security
Cybersecurity company specializing in structured, quantitative security assessments for IT and OT systems; provides penetration testing services with real-world attack simulations; founded 2023, 6 employees, based in London, UK; active social media presence; 14.3% monthly workforce growth.
Exponential-e
UK-based IT services and consulting company providing secure cloud, connectivity, cyber, and voice solutions; 492 employees, $255.7M revenue, founded 2002, headquartered in London. Offers penetration testing, red team testing, and website security testing, with a focus on active cybersecurity testing and exploitation simulation.
Digital Interruption
UK-based cybersecurity consultancy in Manchester; provides penetration testing across web, mobile, API, and network environments with risk identification and remediation services.
Reliance Cyber
Reliance Cyber is a UK-based IT services and cybersecurity consulting company with 48 employees and $5M-$25M annual revenue; specializes in penetration testing, threat intelligence, incident response, and managed security services, with a focus on safeguarding organizations in the digital landscape.
Closed Door Security
UK-based cybersecurity firm specializing in penetration testing and security assessments; registered in the UK (SC585645), headquartered in Stornoway, UK; offers professional pentest services as highlighted on their website and supported by external sources.
CodeShield (Cyber Security)
UK-based cybersecurity firm specializing in penetration testing for web apps, networks, and cloud environments; 1 employee; focuses on threat detection and compliance (ISO, PCI, SOC2, Dstp).
Attack Vector Ltd
UK-based cybersecurity firm specializing in penetration testing; offers infrastructure, web app, cloud, social engineering, and mobile testing; registered in London with Company No. 14996130.
Sophos
Cybersecurity software development company based in the United Kingdom; 3,664 employees, $1B revenue, founded 1985, GBP2.8B market cap, $125M funding; offers endpoint, network, cloud security, and penetration testing services; serves 600,000 organizations globally with an AI-driven platform and expert-led services.
UK Pen Testing – A LevelUp Networks service
Cybersecurity company specializing in penetration testing and security assessments; based in London, UK, with services including Penetration Testing as a Service, Web Application Penetration Testing, Red Team, Cloud Security, Phishing, Firewall Audits, and Ransomware Assessments; explicitly confirmed UK address in London.
Laneden Ltd
Cybersecurity company specializing in penetration testing, threat simulation, and compliance testing; based in United Kingdom with 1 employee, founded in 2019. Offers services including penetration testing, social engineering, web app security, and infrastructure reviews, focusing on identifying security vulnerabilities and quantifying risks.
NeedSec Limited
UK-based cybersecurity company specializing in penetration testing; headquartered in London, with a registered office at 86-90 Paul Street, London, England. Provides security testing services to identify system vulnerabilities.
Pentest Limited
UK-based cybersecurity company founded in 2019; registered at 22 Great James Street, London, with company number 11925182; provides manual penetration testing, red teaming, and security consultancy services.
SecurityHQ
UK-based MSSP specializing in penetration testing, MDR, and bespoke cybersecurity services; recognized as a leader by KuppingerCole and Frost & Sullivan; offers 24/7 MXDR, security posture management, and vulnerability detection; CREST accredited.
SensePost
UK-registered ethical hacking team within Orange Cyberdefense; specializes in penetration testing and offensive security services; based in Maidstone, Kent, with official UK Companies House registration.
Techforce
UK-based cybersecurity firm headquartered in Aberdeen and Edinburgh; offers penetration testing, cyber maturity assessments, Cyber Essentials certification, virtual CISO, vulnerability management, and managed security services; specializes in protecting businesses from cyber threats with expert consulting and testing solutions.
Intertek
Intertek is a UK-based provider of quality assurance and testing services, headquartered in London at 33 Cavendish Square. The company explicitly offers penetration testing and cybersecurity assessment services, including vulnerability testing and manual penetration tests, across multiple industries.
4N6
IT services and consulting company specializing in cybersecurity, troubleshooting, diagnostics, post-incident reviews, and digital forensics; offers full penetration testing services including active exploitation, vulnerability analysis, and remediation; based in London, UK with 1 employee, 1,122 monthly website visits, and ranked #11,322,919 globally.
BSI Cyber Consulting
Cybersecurity company specializing in penetration testing, red team assessments, and information security services; supports CREST-certified pentest offerings and detailed testing procedures; 2 employees, $9.44M revenue, headquartered in Cambridge, UK.
Socura
Cybersecurity company specializing in managed detection and response, digital forensics, incident response, and rapid response services; CREST-approved with formal penetration testing credentials, collaborating with partners like Rootshell Security for pentest services; based in Cardiff, UK, with 30 employees and 32.3% YoY growth.
Bema Cyber Tech Ltd
UK-based IT service provider specializing in cybersecurity; offers penetration testing services; registered in London with a UK office at 124 City Road; provides solutions for public and private sectors to achieve Cyber Essentials certifications.
Sodium Cyber Ltd
Cybersecurity consultancy specializing in penetration testing and security assessments; based in Worcestershire, UK with 2 employees, founded in 2020. Offers web application and infrastructure pentests, cloud security, secure code reviews, and maritime systems security; 208 monthly website visits.
PlutoSec
UK-based cybersecurity provider specializing in penetration testing; emphasizes leadership in UK cybersecurity market with multiple UK addresses and branding; offers comprehensive cybersecurity solutions across major UK cities.
ROSCA Technologies
UK-based cybersecurity consultancy specializing in CREST penetration testing for networks, applications, and cloud; located in London, with a focus on strategic cybersecurity management and testing services.
Mongoose Cyber Security
UK-based cybersecurity company founded in December 2022; provides comprehensive penetration testing services including external, web app, social engineering, internal, wireless, and physical testing; CREST-accredited for formal pentest capabilities; registered in Wilmslow, England (Unit 3, Building 2, The Colony Wilmslow, SK9 4LY).
Syn-Star IT Support
UK-based IT services and consulting company founded in 2002; 13 employees, $2.4M revenue; specializes in business IT support, cybersecurity, and penetration testing with dedicated pentest services; serves SMEs with a focus on reliable, end-to-end IT solutions and security.
Simple IT Distribution Ltd
UK-based software development firm founded in 2015 with 2 employees; provides penetration testing and vulnerability management services using tools like Metasploit, demonstrating active security testing capabilities; has 1,096 monthly website visits and a global rank of #11,686,164.
SIBR
Cybersecurity consultancy and penetration testing firm based in London, UK; 3 employees, founded 2021; offers services including penetration testing, vulnerability management, and cloud security to SMEs; over 20 years of combined security experience.
Bluefort Security
UK-based cybersecurity provider specializing in penetration testing; offers automated pentest solutions like Pentera and holds CREST certification credentials, demonstrating active and certified pentest capabilities • 50-100 employees; Cybersecurity; Founded 2010; Farnborough, UK
HAKFLOW
UK-based cybersecurity firm specializing in blockchain security and penetration testing; provides advanced auditing and active penetration testing services to assess and improve blockchain security measures, with headquarters in London, UK.
Woodsec
UK-based cybersecurity firm specializing in penetration testing and cyber security assurance; founded 2022, with formal registration at Kidderminster, England. The company emphasizes its expertise in advanced IT support, application security, and research, serving clients with boutique, expert cybersecurity services.
KT Secure UK
KT Secure UK is a cybersecurity company based in the United Kingdom, specializing in software code signing, hardware security modules, and penetration testing services; with 2 employees, 150% YoY growth, founded in 2009, and a focus on security assessments, vulnerability testing, and key management.
Boxxe
UK-based IT solutions provider specializing in hardware, software, managed IT services, and cybersecurity; explicitly offers penetration testing (pentest) services as part of its cybersecurity portfolio; registered in England and Wales with a York headquarters.
Bae Systems
UK-based defense, security, and aerospace company headquartered in London; offers penetration testing, red teaming, and security testing services for organizations, with active cybersecurity operations and service offerings.
Securious - Data and Cyber Security
Cybersecurity compliance and pentesting company based in Exeter, UK; 11 employees with 18.2% YoY growth; founded in 2007; provides PCI DSS, ISO 27001, Cyber Essentials, and penetration testing services to UK and international clients.
Xpertex Ltd
UK-based IT services and consulting firm specializing in cybersecurity, including penetration testing and breach & attack simulation; 9 employees with -6.7% YoY growth; founded 2006; headquartered in Welwyn Garden City, England; active in security assessments, vulnerability analysis, and machine parts manufacturing.
Zepko
Cybersecurity firm based in Guildford, United Kingdom, specializing in penetration testing; offers detailed security assessments using standardized testing methodologies and emphasizes human intervention to enhance resilience.
Cybergen® Security
Cybergen® Security is a UK-based IT services and cybersecurity consulting firm founded in 2023, with a focus on penetration testing, red teaming, and threat mitigation. The company provides CREST-accredited penetration testing and 24/7 managed detection and response, emphasizing proactive security testing and vulnerability identification, despite having only 1 employee.
Protection Group International
Protection Group International is a UK-based security and investigations firm specializing in digital resilience, security consulting, and cyber security services; with 77 employees (+10.6% YoY growth), $15M annual revenue, founded in 2013 in London. PGI provides CREST-aligned penetration testing services, demonstrating formal technical standards, and serves a global client base including governments and NGOs. The company operates in multiple languages and maintains active social media engagement.
Arcanum Information Security
Cybersecurity company specializing in penetration testing and security training; 2 employees with 100% YoY growth; based in Llanegwad Ed, UK; offers external and web application pentest services, training, and media; 15,303 monthly visits, global rank #1,648,340.
Six Degrees
IT Services and Consulting company based in London, UK, with 196 employees and $157.8M annual revenue; specializes in infrastructure, hybrid cloud, Azure management, and FinOps; explicitly offers penetration testing services including Penetration Testing as a Service and Red Teaming with CHECK/CREST accreditation; founded in 2011, with $145.9M in funding and active market presence.
GoDefend (Cyber Security)
Cybersecurity company based in the United Kingdom; specializes in data security software, penetration testing, breach detection, and compliance solutions; 5 employees, founded 2018, $3.3M funding, recent £250K investment to grow threat detection tech; competes with qingteng cloud security and sonet.io.
MTI
Private UK-based IT & cybersecurity company with 214 employees, $45.6M revenue, founded in 1987; specializes in data security, data centre modernization, and IT managed services; provides penetration testing with CREST certification and active testing operations; acquired by Ricoh in 2020.
ResilientX Security
Cybersecurity company specializing in penetration testing, attack surface management, and third-party risk solutions; provides active testing and simulated attack services with a focus on web, cloud, and network security; 10 employees; Founded 2022; London, UK.
Bridewell
Cybersecurity company based in Reading, UK, specializing in computer and network security; 224 employees (+7.9% YoY growth), $6.0M revenue, founded 2013; provides penetration testing and security consulting, trusted by critical infrastructure organizations and highly regulated sectors.
CYFOR Secure | Cyber Security
Cybersecurity company based in Manchester, UK, with $4.1M annual revenue; specializes in penetration testing, digital forensics, incident response, vulnerability assessments, dark web monitoring, and cybersecurity audits; founded in 2002.
Mongoose Cyber Security
UK-based cybersecurity company specializing in CREST-accredited penetration testing; headquartered in Wilmslow, Cheshire, with official registration confirming UK operations; focuses solely on penetration testing services, emphasizing real-world threat simulation.
CyberCX
UK-based cybersecurity company providing penetration testing, incident response, vulnerability assessments, and governance, risk, and compliance services; explicitly signals UK origin and offers detailed pentest solutions.
tmc3
IT services and cybersecurity company based in the United Kingdom; 20 employees with 27.3% YoY growth; founded in 2021; specializes in penetration testing, data protection, security assurance, and secure development lifecycle for government, critical infrastructure, and healthcare sectors.
Cyberfort
UK-based cybersecurity firm specializing in penetration testing services such as code reviews, cloud security testing, AI/LLM testing, and application/web/network/internals testing; performs active attack simulations to identify vulnerabilities.
Methods
UK-based private IT & Services company specializing in digital transformation and cybersecurity; 313 employees, $148.4M revenue, founded 1990, headquartered in London, UK; provides penetration testing services with active engagements and case studies demonstrating expertise.
Wavenet
UK-based IT managed services provider specializing in cybersecurity, communications, and connectivity; offers CHECK & CREST approved penetration testing services; headquartered in Solihull, England, with multiple UK offices; focuses on enhancing security and connectivity for businesses.
Modux
UK-based cybersecurity firm specializing in penetration testing and security assessments; NCSC-approved CHECK company with government accreditation; offers security testing for IT systems, products, and services, with proven expertise in assessing security weaknesses.
Pentest Laboratories
UK-based cybersecurity company founded in 2018; specializes in penetration testing services with modernized methodologies to enhance organizational resilience against cyber threats.
CyberLegion
CyberLegion is a UK-based cybersecurity company specializing in penetration testing, secure-by-design product security, and cybersecurity advisory services; founded in 2021, it has 1 employee and offers crest-approved penetration testing, with a global rank of #6,605,571 and 385 monthly website visits.
Delta Cyber Security Ltd
UK-based cybersecurity company specializing in penetration testing, cyber essentials certification, and cloud security reviews; headquartered in Chichester, West Sussex, with a focus on simplified, accessible security solutions grounded in experience.
Testhouse
UK-based QA and security testing company headquartered in London; offers penetration testing services aligned with OWASP, PCI DSS, and GDPR, recognized by Gartner for quality assurance excellence.
ProCheckUp
ProCheckUp Ltd is a UK-based cybersecurity firm specializing in penetration testing and security audits; CREST-approved and NCSC CHECK accredited, with headquarters in Portsmouth, England, and registered at 14 St Georges Business Centre, Portsmouth, PO1 3EZ.
Acutest
UK-based software testing and quality assurance consultancy; offers penetration testing services; registered in York, England, with additional UK addresses; specializes in testing software, business processes, and IT to improve digital transformation projects.
BT Group
UK-based telecommunications company with 30,295 employees and GBP20.4B annual revenue; operates the largest fixed and mobile networks in the UK; provides active cybersecurity services including penetration testing and ethical hacking; GBP137.8M market cap; over $8.7B in funding; headquartered in London, UK.
Zen Internet
UK-based private telecommunications provider founded in 1995; operates one of the largest independent data networks in the UK; offers broadband, hosting, domains, and security services including penetration testing; 372 employees (+5.8% YoY growth); $109.8M annual revenue; $25.8M funding; B Corp certified; headquartered in Rochdale, UK.
Qualitest
IT services and consulting company specializing in AI-led quality engineering, software testing, and cybersecurity including penetration testing and red team services; 3,735 employees; Founded 1997; London, UK; $220M revenue; Global rank #369,569; 93,202 monthly visits; 3.5/5 employer rating.
BreachLock
Cybersecurity firm based in London, UK, providing penetration testing, attack surface discovery, and red teaming services; offers continuous security testing and evidence-backed attack surface management.
Prolifics Testing
UK-based cybersecurity company specializing in penetration testing; employs CREST-certified professionals; offers internal and external testing for networks, web, mobile, and APIs; registered in the UK with company number 03814910; principal office in Borehamwood, Hertfordshire.
Rexon Cyber
Cybersecurity company based in London, UK, specializing in penetration testing services; offers internal, wireless, web app, mobile app, cloud, and API pentests, positioning itself as a strategic cybersecurity partner in the UK.
CCL Solutions Group
Cybersecurity and digital forensics company based in the United Kingdom; specializes in penetration testing and breach simulation services, with a focus on identifying security vulnerabilities and protecting digital assets.
KiwiQA
UK-based software testing company specializing in penetration testing; explicitly offers pentest services to reduce security risks, with a UK address at Vista Business Centre, Hounslow, TW4 6JQ. Provides comprehensive QA and testing solutions.
PwC
UK-based professional services firm with 120,836 employees and $55.4B revenue; offers assurance, tax, advisory, and cybersecurity services including penetration testing and ethical hacking (CREST-accredited); registered office at 1 Embankment Place, London; operates globally with a network of over 370,000 staff in 149 countries.
Cybata
Cybata (BD Research Ltd) is a UK-based information services company specializing in cybersecurity, GDPR, and data protection consulting and training for charities and health tech organizations; with 2 employees, 200% YoY growth, and explicitly offers penetration testing services.
Wilbourne
Wilbourne is a UK-based cybersecurity consultancy specializing in bespoke attack simulations, GRC, incident response, and training. With 5 employees and founded in 2018, it provides penetration testing services across web, API, and infrastructure domains, and holds CREST accreditation, demonstrating advanced offensive security capabilities.
CyberPrism
UK-based OT security provider; specializes in operational technology cybersecurity including penetration testing services; registered in London as a Private Limited Company; focuses on safeguarding critical industrial and national infrastructure.
Predatech
UK-based IT services and cybersecurity consultancy specializing in penetration testing, vulnerability management, and security certifications; 8 employees with 28.6% YoY growth since 2020; offers CREST-accredited pentest services and helps organizations enhance cyber defenses.
Netcentrix
UK-based IT managed services provider specializing in cloud, infrastructure, security, and professional services; offers penetration testing services as indicated in their terms and conditions; registered in England with company number 03076196, headquartered in Buckshaw Village, Chorley, Lancashire.
Trustmarque
UK-based IT services and consulting firm founded in 1987; employs 312 staff with $106.5M annual revenue; specializes in IT solutions, cloud, managed, and professional services for healthcare and government sectors. Offers CREST-certified penetration testing services with CHECK accreditation, emphasizing cybersecurity expertise; operates in a competitive landscape including Roke and ECSC Group.
CYSIAM
CYSIAM is a UK-based private cybersecurity firm specializing in threat-led 24/7 Managed Detection and Response (MDR) services; it provides CREST-accredited penetration testing and security consulting, with 29 employees and 13.5% annual growth. The company is trusted by UK public sector organizations and was founded in 2018 in Milton Keynes.
3B Data Security
UK cybersecurity company specializing in incident response, compliance, forensic investigations, and penetration testing; headquartered in Tunbridge Wells with operational address in Sawston, Cambridge; offers penetration testing services and extensive security consulting.
Tranchulas
Cybersecurity company specializing in penetration testing, red teaming, and threat intelligence; 11 employees with 20% YoY growth; founded in 2006; headquartered in London, UK; offers offensive and defensive cyber solutions, ISO 27001, incident response, and cyber training.
Aon
Aon is a private financial services company based in London, UK, with 39,740 employees and $17.0B annual revenue; it offers consulting, risk management, insurance, actuarial, brokerage, and cybersecurity testing services, including CREST-certified penetration testing and red team assessments, demonstrating its comprehensive cyber resilience capabilities.
Air IT Group
UK-based managed IT service provider with 285 employees and $45M revenue; specializes in cybersecurity, business intelligence, and automation for SMEs; CREST-certified for penetration testing, with active pentest services; 21,561 monthly visits, ranked #1,190,653 globally, founded in 2005.
AppCheck Ltd
UK-based cybersecurity firm specializing in automated vulnerability scanning and penetration testing; offers web application and API security assessments, with a focus on continuous, automated testing; markets itself as providing the world's most advanced automated penetration testing tools.
Periculo
UK-based IT services and cybersecurity consultancy with 11 employees, founded in 2015; specializes in cybersecurity for digital health including Penetration Testing, Cyber Essentials, ISO 27001, and Medical Device Security; 18.2% monthly growth, 1,720 monthly visits, ranked #8,134,692 globally.
Evolve North Ltd
UK-based consultancy specializing in Governance, Risk, and Compliance, and IT Security and Assurance; provides penetration testing services to identify and remediate vulnerabilities in IT environments; headquartered in Durham, England, with registered office in North Yorkshire.
Falanx Cyber
Cybersecurity company based in Reading, UK, specializing in penetration testing, cyber defense, and network security solutions; 5 employees with 0% monthly growth and -5.3% YoY decline; founded 2014; serves sectors including public, legal, education, healthcare, and finance; competes with Black Hat, Cyberseer, and Abile Group.
CyberOne
CyberOne (Comtact Ltd.) is a UK-based private cybersecurity firm specializing in proactive security testing, including CREST-accredited penetration testing; 51 employees with +23.4% YoY growth; $12M annual revenue; founded in 2005; offers integrated security solutions such as identity management, email, internet, and network security; recognized as one of 100 global Microsoft partners.
Cyber HQ
Cyber HQ is a cybersecurity consulting company based in the United Kingdom; they provide penetration testing, threat and vulnerability management, security operations, and business resilience services. The firm is registered at 160 City Road, London, with active status and has been operational since at least 2023.
SMARTSEC Information Security
UK-based cybersecurity consultancy founded in 2019 with 3 employees; specializes in penetration testing, Web3 & AI security, security operations, and vCISO advisory; offers comprehensive security solutions and compliance services.
SureCloud
UK-based GRC and risk management software provider; offers penetration testing services including PTaaS with CREST accreditation; headquartered at 1 Sherwood Street, London W1F 7BL, England.
CodeGrazer Ltd.
Cybersecurity firm specializing in penetration testing and security assessments; offers internal penetration testing, web and mobile application security, hardware and IoT hacking, social engineering, and phishing; based in Leeds, UK with 2 employees, founded in 2018.
OnSecurity
UK-based cybersecurity firm specializing in CREST-approved penetration testing; offers AI-augmented services across web, mobile, cloud, and physical security with a focus on efficiency and quality; registered in Bristol, England.
Cybertec.group
UK-based cybersecurity firm specializing in penetration testing; offers CREST-qualified assessments for corporate and government clients, emphasizing integrity and professionalism; over 140 years of experience.
Citation Cyber
Citation Cyber is a UK-based IT services and cybersecurity consulting company with 23 employees and GBP 1.0M annual revenue; founded in 2012 and headquartered in Lancaster, UK. The firm specializes in certified penetration testing, including web, cloud, mobile, and physical assessments, to safeguard systems and data. It competes with Novicom, QSEAP, and Assured, and actively engages in cybersecurity news and awareness campaigns.
Secure Nexus
Secure Nexus is a private UK-based technology and cybersecurity firm founded in 2023, with 2 employees. Specializing in advanced network design, penetration testing, and security solutions, it aims to build a secure digital nexus for clients. Headquartered in Stirling, Scotland, the company focuses on safeguarding digital assets and optimizing connectivity.
Cyber Tech Guardians
Cyber Tech Guardians is a UK-based cybersecurity firm specializing in penetration testing services; headquartered in London with verified address at 3rd Floor/45 Albemarle Street, Mayfair, London W1S 4JL. The company explicitly lists penetration testing as a core service on their website, confirming their role in security assessments.
Secureit
Cybersecurity company headquartered in London, UK; offers penetration testing (pentest) services as a core offering, with UK-based contact info (+44 207 792 5924).
EJN Labs
UK-based private cybersecurity firm specializing in AI-powered cyber defense, including penetration testing, red teaming, and bug bounty; CREST certified; 3 employees; Founded 2022; Headquarters in United Kingdom.
Ethernal
Cybersecurity company specializing in network security, penetration testing, and cyber resilience; founded 2015, 2 employees, based in Highbridge, UK, with 100% monthly growth and services including security health checks, endpoint protection, and compliance.
WhiteHat
Security and investigations company specializing in penetration testing, physical intrusion simulations, and privacy consultancy; UK-based in Preston, with active RED Teaming and privacy counter-measures services.
TIEVA
UK-based IT services and consulting company specializing in transformative business IT solutions, multi-cloud strategies, and cybersecurity, including penetration testing services; 135 employees (+0.6% YoY growth); founded 2007; headquartered in Leeds, UK.
FluidOne
UK-based IT services and consulting firm specializing in secure data, voice, and cloud solutions; offers penetration testing and cybersecurity services; 152 employees, $132.4M revenue, founded 2006, headquartered in London, UK; recognized for high NPS and recent UK expansion.
Tech Guard
Cybersecurity company specializing in computer and network security; provides penetration testing, vulnerability analysis, ethical hacking, ransomware prevention, and social engineering services; 3 employees with 50% YoY growth; founded 2017; based in London, UK.
Cyberhash UK
Cyberhash Limited is a UK-based cybersecurity company specializing in penetration testing services; explicitly offers CREST-certified manual and automated pentests to evaluate defenses against simulated attacks. Registered in England and Wales with an office in Maidenhead.
HZL
Security and investigations company based in the United Kingdom; provides physical penetration testing, red teaming, security training, assessment, and consultancy services. Employs 45 staff with 5.1% YoY growth; founded in 2000. Web presence includes 1,712 monthly visits and a global rank of #8,573,418.
URM
URM (URM Consulting Services Ltd) is a UK-based business consulting firm specializing in information security and risk management; 42 employees with 36.4% YoY growth, $1M-$5M revenue, founded in 2005, headquartered in Reading, UK. The company provides penetration testing, vulnerability assessment, ISO 27001, GDPR, PCI DSS, and business continuity services, with a global rank of #1,589,893 and 14,482 monthly visits.
Astrix
Astrix is a UK-based private cybersecurity firm founded in 1997, with 6 employees and a -16.7% YoY growth. It specializes in computer and network security, explicitly providing penetration testing services as part of its cybersecurity assessments, utilizing questionnaires, automated tools, interviews, and pentests. The company has a modest web presence with 1,208 monthly visits and a global rank of approximately 9.94 million.
NGS | Next Generation Security
UK-based cybersecurity company specializing in penetration testing; offers manual and automated pentest services, including CREST-certified testing; registered in England and Wales with Company Number 11204446, headquartered in the United Kingdom.
Cyber Analytica
Cyber Analytica is a UK-based cybersecurity firm specializing in IT managed services and penetration testing; headquartered in London, UK, with explicit mention of pentest services on its homepage and comprehensive endpoint protection offerings.
Laburity
Cybersecurity services provider based in the United Kingdom; specializes in vulnerability assessments, penetration testing, compliance, and code analysis; 9 employees; Founded 2022; Offers active penetration testing services and holistic cybersecurity solutions.
SRM - Security Risk Management Ltd
UK-based private information services company founded in 2002; specializes in cybersecurity with explicit penetration testing services to identify vulnerabilities; 4 employees, $6.5M revenue, $16.7K seed funding, part of Arcanum Group, with recent activity in security collaborations and innovations.
CyberWhite Ltd
CyberWhite Ltd is a UK-based cybersecurity consultancy specializing in penetration testing, risk mitigation, and security assurance; with 8 employees, founded in 2018, and a client-focused approach that emphasizes tailored security solutions, training, and compliance in cybersecurity standards.
The Times
The Times is a private newspaper publishing company based in London, UK, with 703 employees (+18.1% YoY growth), $40M annual revenue, founded in 1785. It attracts ~25M monthly website visits and ranks #2,383 globally. The company provides UK, US, and world news, analysis, and headlines, with active penetration testing services as evidenced by multiple cybersecurity roles.
Barefoot Cyber
Cybersecurity company headquartered in the United Kingdom; specializes in penetration testing services with proven ability to scope, review, and execute pentest engagements.
RightCue
Cybersecurity consulting firm specializing in compliance and penetration testing; 14 employees (+26.7% YoY growth); CREST-certified pentest services; Founded 2009; Basingstoke, UK.
Cybarik
Cybersecurity consulting firm based in the UK; provides penetration testing, vulnerability assessment, and tailored cybersecurity training for individuals and organizations. Located in Harlow, Essex, with a focus on improving clients' cybersecurity skills and knowledge.
Zoonou
UK-based IT services and consulting firm specializing in software testing and QA; offers comprehensive testing including penetration testing validated by CREST and UK Digital Marketplace; 34 employees, $4.1M revenue, founded 2007, headquartered in Eastbourne, East Sussex.
Digital Pathways Ltd
UK-based private IT security firm founded in 1996; specializes in penetration testing, ethical hacking, data encryption, and compliance; 2 employees, over 20 years of experience in cyber security; offers managed security services, data leakage detection, and GDPR consultancy.
Hacker Academy
Cybersecurity training and consultancy provider with a focus on penetration testing and attack simulations; 5 employees, +25% YoY growth, founded 2017, based in United Kingdom. Operates CyberLabs for real-life cyber-attack simulations, helping organizations improve cybersecurity posture.
Nellcote Ltd
UK-based private cybersecurity firm specializing in penetration testing and security consultancy; 5 employees with 33.3% YoY growth, founded in 2017, CREST accredited with expertise in active attack simulations across multiple environments, emphasizing personalized IT and cybersecurity services.
IT Valley London Ltd
IT Valley London Ltd is a UK-based IT services and cybersecurity company specializing in penetration testing, application security testing, ransomware, and cloud penetration testing; with 2 employees and 50% YoY growth, they focus on delivering high-quality security solutions for businesses.
Forensic Control
Cybersecurity consultancy based in London, UK; specializes in penetration testing, security assessments, and vulnerability scans; headquartered at 15 Belgrave Square, London, SW1X 8PS; offers tailored cybersecurity solutions to assess, prevent, and respond to cyber threats.
IOActive, Inc.
IOActive, Inc. is a private computer and network security firm founded in 1998, with 83 employees and $25M annual revenue; they have a UK-registered branch, IOACTIVE EUROPE LIMITED, based in London. The company offers full-stack security assessments, secure development lifecycle, advisory, and training services, serving industries such as critical infrastructure, healthcare, and finance. They explicitly market penetration testing and red team services, and have been recognized with cybersecurity awards; recent activities include security research and vulnerability disclosures.
Omerta
Omerta is a UK-based private IT services and cybersecurity consulting firm specializing in security consultancy, penetration testing, and cyber defense solutions; with 24 employees, $10M annual revenue, founded in 2009, and operating globally. The company explicitly offers penetration testing services, including remote and physical testing, and is positioned within the security and cyber security market with notable competitors like Promon, Lookout, and Asavie.
iSoft
UK-based cybersecurity firm specializing in penetration testing and ethical hacking; headquartered in Stockport, Cheshire, UK, with a presence in Manchester. Focuses on identifying vulnerabilities and safeguarding data against advanced cyber threats.
VaultStrike
VaultStrike is a UK-based private cybersecurity firm specializing in real-time website protection, vulnerability assessment, penetration testing, and security monitoring. Founded in 2020 and experiencing 150% YoY growth with 4 employees, it offers advanced security products, training, and courses in web design, graphic design, video editing, and active directory security, positioning itself as a cybersecurity automation partner.
Cyber Security Partners
UK-based cybersecurity consultancy founded in 2016; headquartered in Leeds, England. Provides penetration testing services, including internal and external pentests, to help organizations mitigate cyber risks.
Mobility Cyber Labs
Private automotive cybersecurity consulting firm based in the United Kingdom; specializes in design, testing, and benchmarking for secure mobility, including penetration testing, vulnerability assessments, and validation services; founded 2024, 4 employees, categories include automotive cybersecurity, secure mobility, ISO 21434, UNECE R155.
A&o It Group
Cybersecurity firm specializing in penetration testing; offers CREST-accredited pentest services across web, mobile, API, network, and physical security; UK-based with headquarters in Bracknell, Berkshire, serving clients worldwide.
Cybergen Security
UK-based cybersecurity company specializing in CREST-accredited penetration testing services; headquartered in Witney, Oxfordshire, with a focus on security testing and incident response.
cydentity.co.uk
UK-based cybersecurity firm specializing in proactive, business-driven protection; offers penetration testing and attack simulation services, including ransomware attack simulations; 2 employees; Founded 2025; Wales, UK.
Samurai Digital Security Limited
Cybersecurity provider specializing in penetration testing, network intrusion, incident response, and information governance; UK-based with 4 employees, $1M-$5M revenue, founded 2016; NCSC certified, serving government and institutions, with CREST accreditation for penetration testing services.
Koris365
UK-based IT and security managed service provider; offers penetration testing with customized automated and manual assessments, and cyber security evaluations; registered in England (Company No. 07709017), headquartered in Hemel Hempstead.
DefensityOne
DefensityOne is a cybersecurity solutions provider based in Milton Keynes, UK, specializing in proactive threat detection, risk management, and digital defense services. The company has 7 employees, was founded in 2015, and focuses on penetration testing, data security, and managed services, with an 18.8% YoY employee decline.
Digital Insights Consultancy
Cybersecurity company based in Milton Keynes, UK; specializes in penetration testing, incident response, digital forensics, and SOC services; 3 employees with -44.4% YoY growth; founded 2019; offers tailored cybersecurity solutions including infrastructure and cloud pentest services.
Acumen Cyber
Acumen Cyber is a UK-based private cybersecurity firm with 23 employees and +40.9% YoY growth, providing 24/7 security services including MXDR, SaaS, cloud, email, web, DNS security, vCISO, and penetration testing; recognized for security testing capabilities and CREST accreditation.
Omnicyber Security
Cybersecurity firm based in the UK and Canada; specializes in penetration testing, managed security, and compliance services; explicitly states penetration testing as a core service and UK presence.
GRC International Group
Cybersecurity company specializing in computer and network security; provides penetration testing services as part of its cyber-defense solutions; 25 employees; GBP 14.7M annual revenue; GBP 8.4M market cap; based in Ely, UK; operates in cybersecurity, IT services, consulting; global rank #8,652,681; 1,467 monthly website visits.
Vorago Security
UK-based cybersecurity company specializing in penetration testing; headquartered in Doncaster, England, with a registered office at 1 Water Vole Way, DN4 5JP; active provider of security testing services, including penetration testing, as detailed on their website.
Cybercy Group
Cybercy Group is a UK-based cybersecurity firm headquartered in Solihull, specializing in AI-enhanced security and data protection solutions; it explicitly offers penetration testing services, including CREST-certified pentest capabilities, serving public and private sector organizations.
Purecyber Limited
UK cybersecurity firm based in Cardiff; provides penetration testing, red teaming, and threat detection services; CREST-certified penetration testing capability; trusted by organizations worldwide.
Interfuture Security Ltd
UK-based cybersecurity firm providing digital security services including penetration testing, managed SOC, incident response, and security assessments; registered at Unit C Kemps Farm Business Park, Balcombe, West Sussex, UK; offers explicit pentest services as indicated on their homepage.
Akita
UK-based IT company specializing in managed IT services and cybersecurity; offers CREST-accredited penetration testing services with headquarters in Sevenoaks, Kent, and Wrotham, Kent.
EmergeCyber
UK-based cybersecurity firm providing automated cyber risk management and penetration testing services; offers continuous network and web app/API pen testing to identify exploitable vulnerabilities, supporting organizations in strengthening security posture.
Secure Purple
UK-based cybersecurity and IT consulting company founded in 2020; 9 employees with -26.1% YoY growth; specializes in penetration testing, vulnerability assessments, security audits, incident response, threat hunting, and digital safety training; headquartered in London, UK, with a focus on comprehensive cybersecurity solutions for businesses and startups.
Data Connect Group
UK-based cybersecurity firm specializing in penetration testing; offers CREST-accredited services with a dedicated testing page and detailed FAQs; headquartered in Harrogate, West Yorkshire, with registered office in West Yorkshire.
EY
Global professional services firm based in London, UK, with 279,628 employees and $51.2B revenue; offers advisory, assurance, tax, financial, and cybersecurity services including penetration testing and red teaming; competes with Deloitte and Accenture; active in public sector initiatives and social media.
Rmg Cyber
Cybersecurity firm based in Lincolnshire, UK; offers penetration testing, auditing, cybersecurity training, risk management, cloud security, and software development services; specializes in web application pentesting with a focus on identifying vulnerabilities and providing remediation.
Cyber Security Specialists
Cyber Security Specialists is a UK-based private cybersecurity consultancy specializing in security consultancy, managed security services, and CREST-accredited penetration testing; 15 employees with 29.6% YoY growth; offers enterprise security architecture, information security, cloud security, security testing, and third-party assurance services.
SSL247 (A Sectigo Company)
UK-based private IT security firm founded in 2003; provides web security, SSL, PKI, and penetration testing services; 19 employees, $5M revenue; operates in 18 markets globally; offers certified pentest services, security audits, incident response, and digital identity solutions; ranked #2,692,341 globally and #271,928 in the UK.
Trustco Plc
UK-based technology company specializing in hybrid cloud, data centre consolidation, and cybersecurity services including penetration testing; registered in Hailsham, England, with explicit mention of conducting penetration testing and vulnerability assessments in their cybersecurity content.
Goaco
UK-based cybersecurity consultancy specializing in penetration testing; offers internal/external pentest services and delivers secure, innovative cybersecurity solutions. Registered in the UK with offices in Ebbsfleet/Northfleet and Scotland; recognized for its trusted expertise in cyber security testing.
Kumoco
UK-based consulting firm specializing in telco digital transformation; offers cybersecurity services including vulnerability assessments and penetration testing with at least annual pentest activity; headquartered in London, UK.
Sytec
UK-based cybersecurity and IT support provider; offers penetration testing, vulnerability scans, and cybersecurity assessments; operates from Salisbury, England; domain is .co.uk, confirming UK registration.
Sytech
UK cybersecurity consulting firm specializing in penetration testing; provides controlled, accredited cyber attack simulations for public and private sector clients across the UK, including police forces and government agencies.
Fortis DPC Limited
UK-based cybersecurity consultancy specializing in GDPR, ISO, PCI DSS compliance, and penetration testing; headquartered in Surrey with verified addresses in Guildford and Downside; offers online penetration testing services conducted by expert teams.
KPMG
Global professional services firm specializing in accounting, advisory, and consulting; 47,522 employees, $36B revenue, headquartered in London, UK; offers penetration testing services with CREST accreditation, serving multiple industries and markets.
Css Assure
UK-based cybersecurity firm specializing in security & compliance, including penetration testing, data protection, and certification programs; registered at No.1 Colmore Square, Birmingham, UK, as Cyber Security Strategies Ltd (Company No. 11070817). Offers technical services such as vulnerability scanning and penetration testing, with dedicated pages and blog content highlighting their expertise.
CybaVerse
Cybersecurity consultancy specializing in penetration testing, compliance, and training; 34 employees with 41.4% YoY growth; based in Portsmouth, UK; founded 2018; secured $3.3M in funding; CREST-accredited for pentest services; offers 24/7 coverage and an all-in-one cybersecurity platform.
Cyber Fortify
UK-based cybersecurity firm providing penetration testing services; offers web, API, mobile, and network pentests with a focus on real-world vulnerabilities; registered at 24 Mill Holme Drive, Brotton, England, TS12 2UR; active company supporting ongoing UK registration.
Cyber Tzar
Cyber Tzar Limited is a UK-based cybersecurity firm specializing in enterprise supply chain risk management; offers penetration testing services including Pen Test as a Service and Automated Penetration Testing, with headquarters in London, UK.
CCS IT Solutions
UK-based IT services and consulting company founded in 2004; provides IT support, cybersecurity, penetration testing, vulnerability scanning, and disaster recovery services; 4 employees; focuses on improving operational maturity and security for UK businesses.
Spritzmonkey
Cybersecurity consultancy based in the United Kingdom; specializes in CREST-certified penetration testing and vulnerability scanning services, actively marketing these capabilities and participating in industry events as a recognized provider.
INTEX IT
IT services and consulting company specializing in information security; provides penetration testing, security audits, data protection, PCI compliance, and security awareness training; based in Chatham, UK, founded 2002, with 2 employees; focuses on security consultancy and compliance services.
The SecOps Group (Creators of PentestingExams.com)
UK-based private cybersecurity firm specializing in penetration testing and security assessment; 30 employees with 17.6% YoY growth; offers external/internal network, mobile app, and web application pentests; recognized for cybersecurity consultancy and education services; active in industry events and social media.
Content+Cloud
IT services and consulting company based in London, UK, with 72 employees and $110M revenue; specializes in Microsoft 365, Azure, Dynamics 365, and cloud infrastructure; rebranded as Advania UK; provides penetration testing services as a CHECK-certified provider.
Cybernitics
Cybernitics is a UK-based cybersecurity firm specializing in offensive security, including red teaming and penetration testing; it offers attack simulations and threat emulation services to help organizations identify vulnerabilities.
SnowCap Cyber
UK-based ethical cybersecurity consultancy specializing in offensive security, penetration testing, and red teaming; provides advanced threat emulation, vulnerability research, and cyber attack simulation with a focus on identifying security vulnerabilities.
Barrier Point Communications
IT services and consulting company based in London, UK, founded in 2011 with 3 employees; specializes in infrastructure, procurement, and cybersecurity including security and ethical hacking services (penetration testing); focuses on small and mid-sized clients with tailored, client-first solutions; staff have over 15 years of experience.
AnchorSec
Cybersecurity company specializing in offensive cyber security and penetration testing; $21.4M annual revenue with +200% YoY growth, 2 employees; founded 2022; Manchester, UK; offers infrastructure penetration testing and vulnerability research to identify and address security vulnerabilities proactively.
.png)
Intersect
Cybersecurity company headquartered in Manchester, UK; specializes in penetration testing and security assessments, offering simulated real-world attack services to identify vulnerabilities.
DCR Partners | Digital | Change | Risk
UK-based business consulting firm specializing in digital transformation, change management, and cyber risk; offers CREST-accredited penetration testing services across network, web, mobile, wireless, and social engineering domains; 11 employees with 27.3% YoY growth, founded in 2014, headquartered in Leeds, UK.
D2NA
IT services and consulting firm specializing in cybersecurity; offers penetration testing, cyber security solutions, and expert advice; based in Stoke-on-Trent, UK, with 24 employees and over 20 years of experience.
Siber Ninja
Cybersecurity company specializing in offensive security and penetration testing; 4 employees with 25% YoY growth; founded 2015; headquartered in London, UK.
River Oakfield
Cybersecurity and investigations company specializing in penetration testing, red teaming, and adversarial simulation; based in London, UK, founded in 2017, with 4 employees and a 28.6% YoY decline in growth.
Arculus Cyber Security
Cybersecurity and compliance firm based in London, UK; provides penetration testing, security architecture, compliance, and risk management services; 6 employees with 52.9% YoY decline; specializes in cyber essentials, SOC 2, and cyber readiness assessments; Bridewell company.
Secure Debug
Cybersecurity company specializing in penetration testing and security solutions; 4 employees with -22.2% YoY growth; founded 2019; Cranfield, UK; provides expert cybersecurity services including penetration testing, cyber security solutions, and comprehensive security to protect businesses from cyber threats.
Intrinsic Security
Cybersecurity company specializing in penetration testing, threat detection, and incident response; 19 employees with 71.4% YoY growth; founded 2023; based in Peterborough, UK; offers vulnerability management, cyber threat intelligence, and attack surface management.
Xalient
IT services and consulting company specializing in modern networking, security, and communications; 205 employees (+22.8% YoY growth), $45.3M revenue; offers penetration testing services; founded 2015; headquartered in Leeds, UK.
Sovereign Secure Ltd
UK-based IT services and consulting company specializing in PCI DSS compliance, security assessments, and penetration testing; 10 employees with 25% YoY growth, founded in 2012, with global offices in the UK, US, Singapore, and Middle East; provides API, web, network, cloud, and cybersecurity testing services.
TestDel
IT Services and IT Consulting company specializing in software testing, including penetration testing and website testing services; 8 employees with 55.6% YoY growth, founded in 2005, headquartered in Harrow, UK. Focuses on outsourcing quality assurance to enhance testing efficiency and ensure issue-free applications.