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Find a pentest company offering Penetration Testing

5149 companies offer this service

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
Bema Cyber Tech Ltd

Bema Cyber Tech Ltd

Infrastructure Penetration Tes...
United Kingdom 2 employees

UK-based IT service provider specializing in cybersecurity; offers penetration testing services; registered in London with a UK office at 124 City Road; provides solutions for public and private sectors to achieve Cyber Essentials certifications.

Penetration Testing
Vulnerability Assessment
Cyber Security Training
+5 more
Sodium Cyber Ltd

Sodium Cyber Ltd

Web Application Pentesting
United Kingdom 3 employees

Cybersecurity consultancy specializing in penetration testing and security assessments; based in Worcestershire, UK with 2 employees, founded in 2020. Offers web application and infrastructure pentests, cloud security, secure code reviews, and maritime systems security; 208 monthly website visits.

Penetration Testing
Security Assessments
Risk Management
+5 more
PlutoSec

PlutoSec

Penetration Testing and Red Te...
United Kingdom 50 employees

UK-based cybersecurity provider specializing in penetration testing; emphasizes leadership in UK cybersecurity market with multiple UK addresses and branding; offers comprehensive cybersecurity solutions across major UK cities.

Penetration Testing
Red Teaming
Cloud Security
+5 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
Simple IT Distribution Ltd

Simple IT Distribution Ltd

Vulnerability Assessment and E...
United Kingdom 2 employees

UK-based software development firm founded in 2015 with 2 employees; provides penetration testing and vulnerability management services using tools like Metasploit, demonstrating active security testing capabilities; has 1,096 monthly website visits and a global rank of #11,686,164.

Penetration Testing
Vulnerability Management
IT Security
+4 more
SIBR

SIBR

Network and Infrastructure Pen...
London, United Kingdom 3 employees

Cybersecurity consultancy and penetration testing firm based in London, UK; 3 employees, founded 2021; offers services including penetration testing, vulnerability management, and cloud security to SMEs; over 20 years of combined security experience.

Managed IT
Cyber Security
Cloud Services
+5 more
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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
HAKFLOW

HAKFLOW

Blockchain Penetration Testing
United Kingdom 2 employees

UK-based cybersecurity firm specializing in blockchain security and penetration testing; provides advanced auditing and active penetration testing services to assess and improve blockchain security measures, with headquarters in London, UK.

Penetration Testing
Blockchain Security Auditing
Smart Contract Analysis
+3 more
Woodsec

Woodsec

Wireless Network Penetration T...
United Kingdom 1 employees

UK-based cybersecurity firm specializing in penetration testing and cyber security assurance; founded 2022, with formal registration at Kidderminster, England. The company emphasizes its expertise in advanced IT support, application security, and research, serving clients with boutique, expert cybersecurity services.

Penetration Testing
Wireless Assessment
Information Security Services
+1 more
KT Secure UK

KT Secure UK

Comprehensive Offensive Securi...
United Kingdom 51 employees

KT Secure UK is a cybersecurity company based in the United Kingdom, specializing in software code signing, hardware security modules, and penetration testing services; with 2 employees, 150% YoY growth, founded in 2009, and a focus on security assessments, vulnerability testing, and key management.

Penetration Testing
Vulnerability Assessment
Software Code Signing
+2 more
Bae Systems

Bae Systems

Red Teaming and Network Penetr...
United Kingdom 28163 employees

UK-based defense, security, and aerospace company headquartered in London; offers penetration testing, red teaming, and security testing services for organizations, with active cybersecurity operations and service offerings.

Penetration Testing
Red Teaming
Security Testing
+1 more
Securious - Data and Cyber Security

Securious - Data and Cyber Security

PCI DSS Penetration Testing
Exeter, United Kingdom 13 employees

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.

Penetration Testing
PCI DSS Compliance
ISO 27001 Certification
+2 more
Xpertex Ltd

Xpertex Ltd

Military-Grade Network Penetra...
Welwyn Garden City, United Kingdom 14 employees

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.

Cyber Security Consulting
Penetration Testing
Breach And Attack Simulation
+3 more
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Zepko

Zepko

Comprehensive IT Environment P...
United Kingdom 9 employees

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.

Managed Security Services (soc)
Penetration Testing
Security Assessments
+2 more
Cybergen® Security

Cybergen® Security

CREST Accredited Penetration T...
Oxford, United Kingdom 2 employees

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.

Penetration Testing
Vulnerability Assessment
Compliance Consultancy (iso27001
+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
Arcanum Information Security

Arcanum Information Security

Web Application Pentesting
Llanegwad Ed, United Kingdom 4 employees

Cybersecurity company specializing in penetration testing and security training; 2 employees with 100% YoY growth; based in Llanegwad Ed, UK; offers external and web application pentest services, training, and media; 15,303 monthly visits, global rank #1,648,340.

Penetration Testing
Cybersecurity Training
Consulting
+1 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
ResilientX Security

ResilientX Security

Web Application and Network Pe...
London, United Kingdom 12 employees

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.

Penetration Testing
Vulnerability Assessment
Attack Surface Management
+5 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
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
tmc3

tmc3

Web Application Penetration Te...
United Kingdom 28 employees

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.

Penetration Testing
Cybersecurity Consulting
Data Protection
+2 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
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Modux

Modux

Infrastructure and IT Systems ...
United Kingdom 9 employees

UK-based cybersecurity firm specializing in penetration testing and security assessments; NCSC-approved CHECK company with government accreditation; offers security testing for IT systems, products, and services, with proven expertise in assessing security weaknesses.

Software Development
Penetration Testing
Security Assessments
+1 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
Delta Cyber Security Ltd

Delta Cyber Security Ltd

Expert-Led Penetration Testing
United Kingdom 3 employees

UK-based cybersecurity company specializing in penetration testing, cyber essentials certification, and cloud security reviews; headquartered in Chichester, West Sussex, with a focus on simplified, accessible security solutions grounded in experience.

Penetration Testing
Cyber Essentials Certification
Cloud Security Reviews
+1 more
Testhouse

Testhouse

Compliance-Aligned Penetration...
United Kingdom 510 employees

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.

Quality Assurance
Penetration Testing
Security Testing
+5 more
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
Acutest

Acutest

Application Penetration Testin...
United Kingdom 30 employees

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.

Software Testing
Quality Assurance
Penetration Testing
+5 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
Zen Internet

Zen Internet

Vulnerability Assessment and P...
rochdale, United Kingdom 569 employees

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.

Penetration Testing
Vulnerability Assessment
Managed Detection And Response
+5 more
Qualitest

Qualitest

AI-Led Penetration Testing
London, United Kingdom 6060 employees

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.

Ai-led Quality Engineering
Penetration Testing
Vulnerability Assessment
+4 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
Rexon Cyber

Rexon Cyber

Penetration Testing Services
United Kingdom 4 employees

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.

Penetration Testing
Security Auditing
Cyber Advisory
+3 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
KiwiQA

KiwiQA

Application Penetration Testin...
United Kingdom 97 employees

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.

Penetration Testing
Automation Testing
Manual Testing
+5 more
Cybata

Cybata

System and Network Penetration...
Nelson, United Kingdom 3 employees

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.

GDPR Compliance
Data Protection Services
Cyber Security Assessments
+5 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
Tranchulas

Tranchulas

Comprehensive Penetration Test...
London, United Kingdom 12 employees

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.

Penetration Testing
Red Teaming
Threat Intelligence
+5 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
Periculo

Periculo

Medical Device Penetration Tes...
United Kingdom 13 employees

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.

Penetration Testing
Risk Assessments
Incident Response
+5 more
Evolve North Ltd

Evolve North Ltd

IT Environment Penetration Tes...
United Kingdom 11 employees

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.

Governance
Risk And Compliance Consulting
IT Security And Assurance
+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
Cyber HQ

Cyber HQ

Network Penetration Testing
United Kingdom 3 employees

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.

Penetration Testing
Threat And Vulnerability Management
Security Operations
+5 more
SMARTSEC Information Security

SMARTSEC Information Security

Tailored Penetration Testing w...
Wakefield, United Kingdom 3 employees

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.

Penetration Testing
Vciso Advisory
Advanced Security Testing
+5 more
CodeGrazer Ltd.

CodeGrazer Ltd.

Web Application Pentesting
Leeds, United Kingdom 2 employees

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.

Penetration Testing
Web And Mobile Application Security Assessment
Iot Device Security Assessment
+3 more
OnSecurity

OnSecurity

AI-Augmented Pentesting
United Kingdom 34 employees

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.

Penetration Testing
Ai-augmented Vulnerability Scanning
Threat Intelligence
+1 more
Cybertec.group

Cybertec.group

CREST Qualified Penetration Te...
United Kingdom 10 employees

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.

Penetration Testing
Crest-qualified Assessments
Security Audits
+3 more
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Citation Cyber

Citation Cyber

Web Application Pentesting
lancaster, United Kingdom 31 employees

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.

Penetration Testing
Cyber Awareness Training
Phishing Simulation
+4 more
Secure Nexus

Secure Nexus

Penetration Testing
Stirling, United Kingdom 1 employees

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.

Penetration Testing
Cyber Essentials
ISO27001:2022
+5 more
Cyber Tech Guardians

Cyber Tech Guardians

Penetration Testing Services
United Kingdom 2 employees

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.

Penetration Testing
Managed Security Services
Threat Detection And Response
+2 more
Secureit

Secureit

Network and Infrastructure Pen...
United Kingdom 10 employees

Cybersecurity company headquartered in London, UK; offers penetration testing (pentest) services as a core offering, with UK-based contact info (+44 207 792 5924).

Penetration Testing
Cyber Security Services
Data Management
+1 more
EJN Labs

EJN Labs

Web Application and API Pentes...
United Kingdom 11 employees

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.

Penetration Testing
Red Teaming
Bug Bounty Services
+5 more
Ethernal

Ethernal

Network Penetration Testing
Highbridge, United Kingdom 2 employees

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.

Penetration Testing
Network Security Health Checks
Security Audits
+4 more
WhiteHat

WhiteHat

Red Teaming and Physical Intru...
United Kingdom 4 employees

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.

Penetration Testing
Physical Intrusion Simulations
Privacy Consultancy
+2 more
TIEVA

TIEVA

Comprehensive Penetration Test...
Leeds, United Kingdom 173 employees

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.

IT Services Including Cybersecurity
Penetration Testing
Cloud Solutions
+3 more
Cyberhash UK

Cyberhash UK

CREST-Certified Manual and Aut...
United Kingdom 8 employees

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.

Penetration Testing
Virtual CISO Service
Security Assessments
+2 more
URM

URM

Network and Application Penetr...
Reading, United Kingdom 135 employees

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.

Cyber And Information Security Consultancy
Penetration Testing
GDPR And PCI DSS Compliance
+4 more
Astrix

Astrix

Comprehensive Cybersecurity Pe...
United Kingdom 10 employees

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.

Penetration Testing
Vulnerability Assessment
Cybersecurity Consulting
Cyber Analytica

Cyber Analytica

Network and Application Penetr...
United Kingdom 3 employees

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.

IT Managed Services
Endpoint Protection
24/7 SOC Monitoring
+5 more
Laburity

Laburity

Vulnerability Assessment and P...
United Kingdom 11 employees

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.

Penetration Testing
Vulnerability Assessment
Compliance Consulting
+5 more
SRM - Security Risk Management Ltd

SRM - Security Risk Management Ltd

Bespoke Penetration Testing
United Kingdom 39 employees

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.

Penetration Testing
Vulnerability Testing
Cyber Incident Response
+5 more
CyberWhite Ltd

CyberWhite Ltd

Network, Cloud, and Applicatio...
United Kingdom 9 employees

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.

Penetration Testing
Risk Mitigation
Information Security Advisory
+2 more
The Times

The Times

Infrastructure and Web Applica...
London, United Kingdom 1557 employees

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.

Penetration Testing
Vulnerability Assessment
Security Consulting
Barefoot Cyber

Barefoot Cyber

Penetration Testing Services
United Kingdom 9 employees

Cybersecurity company headquartered in the United Kingdom; specializes in penetration testing services with proven ability to scope, review, and execute pentest engagements.

Penetration Testing
Vulnerability Assessment
Managed Security Operations
+2 more
RightCue

RightCue

Network Penetration Testing
Basingstoke, United Kingdom 19 employees

Cybersecurity consulting firm specializing in compliance and penetration testing; 14 employees (+26.7% YoY growth); CREST-certified pentest services; Founded 2009; Basingstoke, UK.

Penetration Testing
Cyber Security Compliance Consulting
Risk Assessments
+4 more
Cybarik

Cybarik

Vulnerability Assessment and P...
United Kingdom 91 employees

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.

Penetration Testing
Vulnerability Assessment
Cybersecurity Consulting
+5 more
Digital Pathways Ltd

Digital Pathways Ltd

Penetration Testing and Ethica...
United Kingdom 3 employees

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.

Penetration Testing
Data Security
Encryption
+4 more
Hacker Academy

Hacker Academy

Red Team Operations
United Kingdom 10 employees

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.

Cybersecurity Training And Consultancy
Penetration Testing
Vulnerability Management
+5 more
Nellcote Ltd

Nellcote Ltd

Multi-Vector Penetration Testi...
United Kingdom 8 employees

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.

Penetration Testing
Cybersecurity Consultancy
Ransomware Readiness
+3 more
IT Valley London Ltd

IT Valley London Ltd

Cloud Penetration Testing
Egham, United Kingdom 3 employees

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.

Penetration Testing
Vulnerability Assessment
Cybersecurity Consulting
+4 more
Forensic Control

Forensic Control

Penetration Testing
United Kingdom 2 employees

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.

Penetration Testing
Vulnerability Scanning
Security Assessments
+3 more
IOActive, Inc.

IOActive, Inc.

Full Stack Penetration Testing
Other 133 employees

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.

Penetration Testing
Vulnerability Assessment
Red And Purple Team Services
+5 more
Omerta

Omerta

Technical and Physical Penetra...
United Kingdom 54 employees

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.

Cybersecurity
Penetration Testing
OT And Physical Security
+4 more
iSoft

iSoft

Network and Application Penetr...
United Kingdom 8 employees

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.

Penetration Testing
Ethical Hacking
Vulnerability Assessment
+5 more
VaultStrike

VaultStrike

Corporate Penetration Testing
London, United Kingdom 5 employees

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.

Penetration Testing
Vulnerability Assessment
Real-time Defacement Monitoring
+3 more
Cyber Security Partners

Cyber Security Partners

Internal and External Penetrat...
United Kingdom 10 employees

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.

Penetration Testing
Audit Services
Cyber Assurance
+5 more
Mobility Cyber Labs

Mobility Cyber Labs

Automotive Cybersecurity Penet...
United Kingdom 5 employees

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.

Automotive Cybersecurity Design
Penetration Testing
Vulnerability Assessment
+2 more
AO

A&o It Group

CREST-Accredited Penetration T...
United Kingdom 201 employees

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.

Penetration Testing
Social Engineering
Red Teaming
+4 more
Cybergen Security

Cybergen Security

CREST-Accredited Penetration T...
United Kingdom 1 employees

UK-based cybersecurity company specializing in CREST-accredited penetration testing services; headquartered in Witney, Oxfordshire, with a focus on security testing and incident response.

Penetration Testing
Incident Response
Threat Intelligence
+5 more
cydentity.co.uk

cydentity.co.uk

Full-Spectrum Red Team Testing
United Kingdom 2 employees

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.

Cybersecurity Consulting
Risk Assessments
Compliance Readiness
+4 more
Samurai Digital Security Limited

Samurai Digital Security Limited

Web Application Pentesting
Birmingham, United Kingdom 12 employees

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.

Penetration Testing
Incident Response
Network Intrusion Detection
+5 more
Koris365

Koris365

Customized Automated and Manua...
United Kingdom 60 employees

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.

Penetration Testing
Cyber Security Evaluations
IT Managed Services
+5 more
DefensityOne

DefensityOne

Comprehensive Penetration Test...
Milton Keynes, United Kingdom 13 employees

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.

Cybersecurity Consulting
Managed Security Services
Penetration Testing
+2 more
Acumen Cyber

Acumen Cyber

Comprehensive Penetration Test...
glasgow, United Kingdom 31 employees

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.

24/7 Security Operations Centre
Managed Detection And Response (mxdr)
Vciso And Advisory Services
+5 more
Omnicyber Security

Omnicyber Security

Web Application Pentesting
United Kingdom 23 employees

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.

Penetration Testing
Managed Security
Compliance Services
+2 more
GRC International Group

GRC International Group

CREST-Accredited Penetration T...
Ely, United Kingdom 32 employees

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.

Penetration Testing
Cyber-defence-in-depth Strategies
Compliance Consulting
+4 more
Vorago Security

Vorago Security

Internal and External Network ...
United Kingdom 5 employees

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.

Penetration Testing
Vulnerability Assessment
Risk Management
+2 more