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.
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.
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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.
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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.
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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.
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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.
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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.