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Find a pentest company with CREST

444 companies have this certification

Pentiq

Pentiq

Web Application Pentesting
London, United Kingdom 8 employees

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.

Penetration Testing
Cyber Security Consultancy
Training
+3 more
Heretek

Heretek

Comprehensive Infrastructure a...
United Kingdom 4 employees

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.

Penetration Testing
Vulnerability Assessment
Adversary Simulation
+3 more
Cyber Alchemy Ltd.

Cyber Alchemy Ltd.

Red Teaming and Strategic Pene...
sheffield, United Kingdom 5 employees

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.

Penetration Testing
Resilience Assessments
AI Security Services
+3 more
Pen Test Partners

Pen Test Partners

Web Application Pentesting
Buckingham, United Kingdom 110 employees

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.

Penetration Testing
Red Teaming
Attack Surface Assessment
+5 more
Razorthorn Security

Razorthorn Security

CREST Accredited Penetration T...
Tunbridge Wells, United Kingdom 17 employees

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.

Cybersecurity Consultancy
Penetration Testing
Continuous Threat Exposure Management
+2 more
Mobius Binary

Mobius Binary

Internal and External Penetrat...
Bath, United Kingdom 12 employees

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.

Penetration Testing
Vulnerability Assessment
Red Teaming
+1 more
Sencode Cyber Security

Sencode Cyber Security

Web Application Pentesting
Middlesbrough, United Kingdom 2 employees

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.

Penetration Testing (web
Network
Mobile
+5 more
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Bruce & Butler

Bruce & Butler

External and Internal Penetrat...
Sheffield, United Kingdom 15 employees

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.

Data Protection
Cyber Security
Penetration Testing
+2 more
Salus Cyber

Salus Cyber

CHECK Penetration Testing
United Kingdom 35 employees

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.

Penetration Testing
Critical Response
Data Protection
+3 more
C360RED

C360RED

Web Application Pentesting
United Kingdom 2 employees

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.

Penetration Testing
Vulnerability Assessments
Web Application Testing
+3 more
One Compliance Cyber Limited

One Compliance Cyber Limited

Enterprise Penetration Testing
United Kingdom 17 employees

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.

Penetration Testing
PCI DSS Compliance
Data Protection Consultancy
+4 more
Ruptura InfoSecurity

Ruptura InfoSecurity

Comprehensive Penetration Test...
United Kingdom 14 employees

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.

Penetration Testing
Red Teaming
Cyber Essentials Certification (basic And Plus)
+1 more
Cyberis

Cyberis

Infrastructure and Application...
United Kingdom 27 employees

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.

Penetration Testing
Red Teaming
Incident Response
+2 more
Surecloud Cyber Services

Surecloud Cyber Services

Infrastructure and Cloud Secur...
United Kingdom 28 employees

Cybersecurity company based in Gloucester, UK; specializes in penetration testing, including infrastructure and cloud security testing, with active vulnerability assessment and attack simulation capabilities.

Penetration Testing
Vulnerability Management
Managed Detection And Response
+4 more
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Secarma Ltd

Secarma Ltd

Web Application Pentesting
United Kingdom 23 employees

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.

Penetration Testing
Cybersecurity Consultancy
Certification Services
+1 more
Amr Cybersecurity

Amr Cybersecurity

Human-Led Penetration Testing
United Kingdom 17 employees

UK-based cybersecurity company providing penetration testing services with CREST accreditation; employs vetted, certified security experts for tailored testing, reporting, and post-engagement support.

Penetration Testing
PCI DSS Assessment
Red Teaming
+5 more
CSaaS

CSaaS

Infrastructure and ICS Penetra...
United Kingdom 3 employees

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.

Penetration Testing
Cybersecurity Assessments
Compliance Programs
+5 more
Cyphere Ltd

Cyphere Ltd

Comprehensive CREST-Accredited...
United Kingdom 2 employees

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.

Penetration Testing
Vulnerability Assessment
Red Teaming
+3 more
Cyber Defence Ltd

Cyber Defence Ltd

Goal-Driven Penetration Testin...
United Kingdom 5 employees

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.

Managed SOC
Threat Intelligence
Penetration Testing
+3 more
Cyberlab

Cyberlab

Comprehensive Penetration Test...
United Kingdom 71 employees

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.

Penetration Testing
Red Teaming
Vulnerability Assessment
+4 more
Hackyde Limited

Hackyde Limited

Network and Application Pentes...
United Kingdom 3 employees

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.

Penetration Testing
Red Teaming
Incident Response
+5 more
Risk Crew

Risk Crew

Web Application Pentesting
United Kingdom 9 employees

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.

Penetration Testing
Security Testing
Risk Management
+4 more
Equilibrium Security

Equilibrium Security

CREST-Certified Penetration Te...
United Kingdom 4 employees

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.

Penetration Testing
Cyber Essentials Certification
Cyber Awareness Training
+4 more
NormCyber

NormCyber

CREST-Certified Penetration Te...
United Kingdom 72 employees

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.

Penetration Testing
Managed Detection And Response
Incident Response
+5 more
Genius Security

Genius Security

Web Application Pentesting
Beaconsfield, United Kingdom 2 employees

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.

Penetration Testing
Web Application Testing
Network Vulnerability Assessments
+4 more
Secure Impact Ltd

Secure Impact Ltd

Bespoke Penetration Testing fo...
United Kingdom 6 employees

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.

Penetration Testing
Incident Response Tabletop Exercises
Offensive Security Services
+2 more
Bulletproof (Cyber Security)

Bulletproof (Cyber Security)

CREST & OSCP Penetration Testi...
Other 121 employees

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.

Penetration Testing
Cyber Security Training
Compliance Consultancy
+4 more
Orpheus Cyber

Orpheus Cyber

Simulated Targeted Attack and ...
Other 27 employees

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.

Penetration Testing
Threat Intelligence
External Attack Surface Management
+4 more
Amberwolf

Amberwolf

Threat Intelligence Led Penetr...
United Kingdom 12 employees

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.

Penetration Testing
Attack Simulation
Red Teaming
+1 more
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Talion Cyber Security

Talion Cyber Security

Consultant-Led Penetration Tes...
camberley, United Kingdom 94 employees

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.

Managed Detection & Response (mdr)
Soc-as-a-service
SIEM Optimization & XDR Alignment
+5 more
Pragma

Pragma

Website Security Penetration T...
United Kingdom 11 employees

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.

Penetration Testing
Cybersecurity Consulting
Regulatory Compliance
+4 more
EBC Group

EBC Group

CREST-Approved Penetration Tes...
United Kingdom 119 employees

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.

Managed IT Services
Cloud Solutions
Cybersecurity (including Crest-approved Penetration Testing)
+3 more
PrimoConnect: Compliance Support - Cyber Security - Pen Testing - Cloud - Networks

PrimoConnect: Compliance Support - Cyber Security - Pen Testing - Cloud - Networks

Web Application Pentesting
Other 2 employees

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.

Penetration Testing
Cyber Security Consulting
Compliance Support
+1 more
CovertSwarm

CovertSwarm

Adversary-Led Red Team Penetra...
London, United Kingdom 63 employees

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.

Offensive Cybersecurity Services Including Constant Cyber Attack Subscription
Penetration Testing
Ethical Hacking
+3 more
Node4

Node4

Web Application Penetration Te...
Derby, United Kingdom 753 employees

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.

Cloud Managed Services
Business Applications
Consulting
+5 more
iSTORM®  Privacy - Security - Pentesting Consultancy

iSTORM® Privacy - Security - Pentesting Consultancy

Network and Application Pentes...
Stratford-upon-Avon, United Kingdom 19 employees

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.

Privacy Consulting
Security Consulting
Penetration Testing
+1 more
Aardwolf Security

Aardwolf Security

Web Application Pentesting
United Kingdom 2 employees

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.

Penetration Testing
Vulnerability Assessment
Code Review
+3 more
NCC Group

NCC Group

Network Penetration Testing
United Kingdom 2358 employees

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.

Penetration Testing
Digital Forensics
Incident Response
+4 more
DigitalXRAID

DigitalXRAID

CREST Certified Penetration Te...
United Kingdom 53 employees

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.

Penetration Testing
Vulnerability Assessment
Security Operations Center (soc) Services
+5 more
SECFORCE LTD

SECFORCE LTD

Offensive Security Penetration...
United Kingdom 44 employees

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.

Penetration Testing
Adversary Simulation
Security Consulting
+1 more
Clearfin Security

Clearfin Security

Network Infrastructure Pentest...
London, United Kingdom 3 employees

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.

Penetration Testing
Managed Vulnerability Scanning
Offensive Security Services
Punk Security Limited

Punk Security Limited

Web Application and Cloud Pent...
United Kingdom 6 employees

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.

Devsecops Consultancy
Penetration Testing
Governance Support
+4 more
Closed Door Security

Closed Door Security

Threat Led Penetration Testing
Stornoway, United Kingdom 12 employees

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.

Penetration Testing
Threat Led Penetration Testing
Red Teaming
+3 more
Cognisys

Cognisys

Advanced Infrastructure, Appli...
Leeds, United Kingdom 86 employees

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.

Penetration Testing
Vulnerability Management
Security Compliance Acceleration
+2 more
Fidus Information Security

Fidus Information Security

Advanced Penetration Testing
Cambridge, United Kingdom 5 employees

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.

Penetration Testing
Vulnerability Assessment
Cyber Security Consulting
Aptive Cyber Security

Aptive Cyber Security

Web Application Pentesting
Guildford, United Kingdom 10 employees

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.

Penetration Testing
Web Application Security Testing
Mobile Application Security Testing
+3 more
LRQA

LRQA

CREST-Certified Penetration Te...
Birmingham, United Kingdom 3086 employees

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.

Risk Management
Certification
Crest-certified Penetration Testing
+5 more
A-listware

A-listware

Application Security Penetrati...
United Kingdom 40 employees

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.

Software Development
Application Services
UX/UI Design
+5 more
Bramfitt Tech Labs

Bramfitt Tech Labs

CREST-Certified Penetration Te...
United Kingdom 15 employees

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.

Penetration Testing
Cyber Assurance
Cyber Leadership
+4 more
QinetiQ

QinetiQ

CREST-Certified Network and In...
United Kingdom 8000 employees

British defence technology company based in Farnborough, Hampshire, UK; provides penetration testing services including CREST-certified security assessments and real-world attack simulations.

Penetration Testing
Crest-certified Security Assessments
Real-world Attack Simulations
+3 more
Jumpsec

Jumpsec

Threat-Led Penetration Testing
United Kingdom 25 employees

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.

Penetration Testing
Adversary Simulation
Purple Teaming
+5 more
Resillion

Resillion

Adaptive Penetration Testing
London, United Kingdom 460 employees

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.

Quality Engineering
Managed Testing Services
Penetration Testing
+4 more
JAG SECURE®

JAG SECURE®

Web Application Pentesting
London, United Kingdom 1 employees

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.

Penetration Testing
Vulnerability Assessments
Web And Mobile Application Testing
+4 more
Prism Infosec

Prism Infosec

Penetration Testing and Red Te...
United Kingdom 28 employees

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.

Penetration Testing
Red Teaming
GRC
+5 more
Blackfoot Cybersecurity

Blackfoot Cybersecurity

Comprehensive Penetration Test...
Welwyn Garden City, United Kingdom 29 employees

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.

Data Protection
Governance Risk Compliance
Detection And Response
+4 more
Ascentor Ltd

Ascentor Ltd

CREST-Certified Penetration Te...
West Malling, United Kingdom 18 employees

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.

Cyber Risk Management
Penetration Testing
Cyber Essentials Certification
+3 more
CyberQ Group

CyberQ Group

Comprehensive Penetration Test...
Birmingham, United Kingdom 45 employees

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.

Penetration Testing
Vulnerability Assessment
Security Operations
+2 more
Dionach

Dionach

Penetration Testing and Securi...
United Kingdom 52 employees

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.

Penetration Testing
Security Assessments
Compliance Consulting
+3 more
Exploitr

Exploitr

Web Application Pentesting
United Kingdom 1 employees

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.

Penetration Testing
Vulnerability Assessment
Attack Surface Management
Aristi Limited

Aristi Limited

CREST-Certified Penetration Te...
United Kingdom 20 employees

Cybersecurity company based in Birmingham, UK, specializing in CREST-certified penetration testing services; headquartered in Birmingham, West Midlands, UK.

Crest-certified Penetration Testing
Vulnerability Assessment
Cybersecurity Consulting
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CyberFortis Consulting

CyberFortis Consulting

Network and Application Penetr...
Other 6 employees

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.

Penetration Testing
Compliance Support
Security Auditing
+3 more
Reliance Cyber

Reliance Cyber

Comprehensive Penetration Test...
Waterloo, United Kingdom 76 employees

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.

Penetration Testing
Managed Infrastructure Services
Cyber Engineering
+5 more
Closed Door Security

Closed Door Security

Threat Led Penetration Testing
United Kingdom 15 employees

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.

Penetration Testing
Threat Led Penetration Testing
Red Teaming
+3 more
CodeShield (Cyber Security)

CodeShield (Cyber Security)

Web Application Pentesting
Other 1 employees

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).

Penetration Testing Including Web Application
Network
Cloud
+3 more
Laneden Ltd

Laneden Ltd

Infrastructure and Web Applica...
United Kingdom 3 employees

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.

Penetration Testing
Threat Simulation
Compliance Testing
+3 more
Pentest Limited

Pentest Limited

Web Application Penetration Te...
United Kingdom 50 employees

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.

Manual Penetration Testing
Red Teaming
Security Consultancy
+2 more
SecurityHQ

SecurityHQ

Application and Network Penetr...
United Kingdom 400 employees

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.

Penetration Testing
Managed Detection And Response (mdr)
Extended Detection And Response (xdr)
+5 more
SensePost

SensePost

Offensive Security and Penetra...
United Kingdom 24 employees

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.

Penetration Testing
Security Assessments
Hacking Training
+3 more
BSI Cyber Consulting

BSI Cyber Consulting

CREST Penetration Testing and ...
cambridge, United Kingdom 59 employees

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.

Penetration Testing
Cyber Security Consultancy
Compliance Management
+2 more
Socura

Socura

Vulnerability Assessment and P...
Cardiff, United Kingdom 41 employees

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.

Managed Detection And Response (mdr)
Penetration Testing
Vulnerability Assessment
+3 more
ROSCA Technologies

ROSCA Technologies

Network, Application, and Clou...
United Kingdom 11 employees

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.

Penetration Testing
Cybersecurity Management
Strategic Security Consulting
Mongoose Cyber Security

Mongoose Cyber Security

Comprehensive Penetration Test...
United Kingdom 1 employees

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).

Comprehensive Penetration Testing Services Including External
Web Application
Social Engineering
+3 more
Bluefort Security

Bluefort Security

Automated Penetration Testing
United Kingdom 19 employees

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

Penetration Testing
Cloud Security
Identity Security
+5 more
Protection Group International

Protection Group International

CREST Certified Penetration Te...
London, United Kingdom 125 employees

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.

Digital Resilience
Cyber Security
Penetration Testing
+3 more
Six Degrees

Six Degrees

Comprehensive Penetration Test...
London, United Kingdom 316 employees

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.

Cloud Managed Services
Hybrid Cloud
Cyber Security
+3 more
GoDefend (Cyber Security)

GoDefend (Cyber Security)

Web, Mobile, and Infrastructur...
United Kingdom 8 employees

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.

Penetration Testing
Continuous Threat Monitoring
Vulnerability Scanning
+1 more
MTI

MTI

IT Penetration Testing
Staines-upon-Thames, United Kingdom 1598 employees

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.

Penetration Testing
Cyber Security Risk Assessments
Managed Security Services
+1 more
Bridewell

Bridewell

Red Team Assessment
Reading, United Kingdom 343 employees

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.

Cybersecurity Consultancy
Managed Security Services
Data Privacy
+1 more
CYFOR Secure | Cyber Security

CYFOR Secure | Cyber Security

Comprehensive Network and Appl...
Manchester, United Kingdom 51 employees

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.

Penetration Testing
Vulnerability Scanning
Digital Forensics And Incident Response
+5 more
Mongoose Cyber Security

Mongoose Cyber Security

CREST Accredited Penetration T...
United Kingdom 1 employees

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.

Penetration Testing And Vulnerability Management
CyberCX

CyberCX

Comprehensive Penetration Test...
United Kingdom 1400 employees

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.

Penetration Testing
Incident Response
Vulnerability Assessments
+5 more
Cyberfort

Cyberfort

Application, Web, and Network ...
United Kingdom 156 employees

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.

Comprehensive Cybersecurity Services Including Consultancy
Penetration Testing
Cyber Resilience Audits
+3 more
Methods

Methods

Internal Infrastructure Pentes...
London, United Kingdom 484 employees

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.

Penetration Testing
Vulnerability Assessment
Cyber Resilience
+3 more
Wavenet

Wavenet

Infrastructure Security Penetr...
United Kingdom 731 employees

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.

IT Managed Services Including Cybersecurity
Penetration Testing
Communications
+5 more
CyberLegion

CyberLegion

Crest-Approved Penetration Tes...
Other 1 employees

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.

Penetration Testing
Automated Security Testing
Cybersecurity Advisory Services
ProCheckUp

ProCheckUp

Web Application Penetration Te...
United Kingdom 17 employees

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.

Penetration Testing
Security Audits
Compliance
+2 more
BT Group

BT Group

Ethical Hacking and Penetratio...
London, United Kingdom 72813 employees

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.

Penetration Testing
Vulnerability Assessment
Ethical Hacking
+1 more
BreachLock

BreachLock

Penetration Testing as a Servi...
United Kingdom 121 employees

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.

Penetration Testing
Attack Surface Discovery And Management
Red Teaming
+2 more
Prolifics Testing

Prolifics Testing

Network and Application Pentes...
United Kingdom 500 employees

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.

Penetration Testing
Security Testing
Software Testing Consultancy
+4 more
CCL Solutions Group

CCL Solutions Group

Assumed Breach Simulation
United Kingdom 120 employees

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.

Digital Forensics
Penetration Testing
Breach Simulation
+3 more
PwC

PwC

Ethical Hacking and Red Teamin...
United Kingdom 292491 employees

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.

Audit And Assurance
Tax
Consulting
+3 more
Wilbourne

Wilbourne

Web Application Pentesting
London, United Kingdom 9 employees

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.

Penetration Testing
Security Reviews
Incident Response
+2 more
Predatech

Predatech

Advanced Penetration Testing
Manchester, United Kingdom 9 employees

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.

Penetration Testing
Managed Vulnerability Scanning
Cloud And Server Security Reviews
+2 more
Trustmarque

Trustmarque

Infrastructure Penetration Tes...
United Kingdom 425 employees

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.

Penetration Testing
Cybersecurity
AI And Data Analytics
+4 more
CYSIAM

CYSIAM

Threat-Led Penetration Testing
milton keynes, United Kingdom 42 employees

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.

Managed Detection And Response
Cyber Threat Intelligence
Incident Response
+3 more
3B Data Security

3B Data Security

CREST Certified Penetration Te...
United Kingdom 23 employees

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.

Cyber Incident Response
Compliance Consulting
Forensic Investigations
+3 more
Aon

Aon

Intelligence-Led Penetration T...
London, United Kingdom 88586 employees

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.

Risk Capital Advisory
Human Capital Consulting
Penetration Testing
+3 more
Air IT Group

Air IT Group

Infrastructure and Web Applica...
United Kingdom 403 employees

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.

Managed IT Support
Cloud Services
Cyber Security Including Penetration Testing
+3 more
Falanx Cyber

Falanx Cyber

Penetration Testing and Red Te...
Reading, United Kingdom 18 employees

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.

Penetration Testing
Detect And Respond
Red Teaming
+1 more
CyberOne

CyberOne

Comprehensive Network, Applica...
Other 95 employees

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.

Managed Detection & Response
Penetration Testing
Cyber Incident Response
+4 more