Find a pentest company offering Penetration Testing
5017 companies offer this service
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.
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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.
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.
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.
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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.
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.
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.
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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.
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.
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.
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.
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.
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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.
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.
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.
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.
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 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.
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.
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.
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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.