Find a pentest company with ISO 27001
1560 companies have this certification
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.
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.
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.
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.
Stop wasting time on security questionnaires
ResponseHub uses AI to automate your security questionnaire responses. 100% confidence, save days, unblock deals.
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.
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.
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.
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.
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.
Advertise on pentest.fyi
You could be here!
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Stop wasting time on security questionnaires
ResponseHub uses AI to automate your security questionnaire responses. 100% confidence, save days, unblock deals.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Advertise on pentest.fyi
You could be here!
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.