Penetration Testing Services
Authorised simulated attack and vulnerability testing
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Vulchar
At Vulchar, we specialize in providing vulnerability assessments and penetration testing services to ensure the highest level of security for your website ...
Pentestly.io
Detect and fix vulnerabilities fast with AI-Assisted, expert-led penetration testing. AI-Assisted security testing to keep your business one step ahead.
Mitnick Security
What's the ultimate way to know if your organization is protected from cyber threats? Penetration Testing.
Pentest Consultants
Expert Penetration Testing Services. We're here to help! Whether ... Address: Portland House, New Bridge St W, Newcastle upon Tyne, United Kingdom, NE1 8AL.
Colin Biggers & Paisley
The Missing Link has worked alongside Colin Biggers & Paisley for three years as a trusted advisor to improve their security posture, advise on and supply infrastructure, provide penetration testing and staff security training.
Blitz Cybersecurity
Boutique cyber security expertise for businesses and individuals who demand more than basic defence. Blitz Cyber Security delivers tailored protection through penetration testing, risk and compliance advisory, and rapid incident response.
Quadris Managed IT
Quadris helps organisations design, source, build, deploy, secure and operate complex technology environments across cloud, workplace, infrastructure, cyber security and global supply chain. It provides engineering-led technology integration for secure, resilient IT environments, offering capabilities across the technology lifecycle including advisory, architecture, engineering, innovation, sourcing, integration, deployment, secure-by-design services, managed operations, optimisation and automation.
Pentera
Find out how NHS Royal Bolton Hospital exponentially improved their cybersecurity posture and continuously validate with Pentera and ASV
AMR CyberSecurity
Portsmouth-based cybersecurity consultancy offering penetration testing, red teaming and security assurance delivered by accredited principal consultants. An approved PCI DSS Qualified Security Assessor company, it also provides Swift CSP consultancy, governance risk and compliance support, security architecture design, operational technology assurance, incident response and defence cyber certification. Serves organisations in sectors including finance, healthcare, government, defence, retail, transport, energy and telecommunications.
APOLLOSEC
Cardiff-based cybersecurity firm providing penetration testing, vulnerability management, phishing simulations and tabletop exercises to businesses of all sizes. Its Attack Surface Management platform continuously tracks publicly facing assets externally, alerting clients immediately when weaknesses are found so risks are mitigated before exploitation. The company also helps organisations achieve security compliance.
AXIS PENTEST
Axis Pentest provides information security assurance through penetration testing services across networks, web applications, APIs, cloud environments, mobile applications, and wireless systems. It serves forward-thinking enterprises and organisations across various sectors, including financial services, technology, energy, telecoms, retail, education, government, and healthcare.
AccSec
AccSec delivers cyber security strategies tailored to sectors including power stations and grid operators, utility service providers, multinational organisations and government departments. Its consultancy services cover ISO 27001-2 certification, NIS Directive compliance and Cyber Essentials accreditation for small and medium-sized enterprises. AccSec's penetration testing includes Blue, Red and Purple Team exercises simulating real-world attacks, alongside White Box and Black Box security health checks examining internal and external security measures. The company's NIS Directive compliance consultancy supports organisations navigating regulatory requirements and preparing to respond to cyber incidents.
Adversify
Adversify is a CREST-accredited penetration testing company based in York, providing security testing to organisations across the UK. Its services cover external and internal penetration testing, application penetration testing, system configuration assurance, assumed breach testing and purple teaming. Engagements are designed around an attack surface-led approach, simulating real-world adversary techniques to identify exploitable vulnerabilities and misconfigurations, and to measure clients' detection and response capabilities.
AiMTech
AiMTech designs, secures and supports IT systems for UK businesses, working as both a provider and a certified assessor of Cyber Essentials and Cyber Essentials Plus. The company's cyber security service includes proactive monitoring and prevention, while its IT support covers fully managed, co-managed and outsourced models. AiMTech's penetration testing identifies vulnerabilities across network infrastructure, web applications and cloud platforms before they can be exploited. The company states it works with organisations in rail infrastructure and in the legal and financial sectors, alongside SMEs and other IT firms.
Akimbo Core
Akimbo Core is a Blackpool-based cybersecurity firm providing penetration testing, training and consultancy. Testing covers web applications, infrastructure, cloud environments, wireless networks, firewalls and mobile applications, with manual assessments identifying vulnerabilities such as cross-site scripting and broken authentication. Consultants hold CREST, CompTIA and AWS certifications. The team also delivers security awareness training, incident response training, maturity assessments and incident response testing to help organisations improve their cybersecurity posture.
Appsecco
Application security testing and consulting firm providing offensive security services and developer-centric security programmes.
Assurity Systems
Assurity Systems is a cyber security distributor bringing endpoint defence and resilience-testing technologies to UK and European organisations. The company is the official EMEA sales and marketing representative for AppGuard, a zero-trust endpoint technology that blocks malicious processes at the kernel level without relying on signature-based detection, protecting against ransomware, phishing attacks and file-less malware. Assurity Systems also distributes Validato, a threat-informed defence platform that tests an organisation's resilience against known threats mapped to the MITRE ATT&CK knowledge base, supporting compliance with regulations including DORA and NIS2.
BerSec LTD
BerSec is a cybersecurity consultancy providing penetration testing and security auditing services to organisations. Services include web and mobile application testing to OWASP Top 10 and ASVS standards, network and cloud penetration testing, source code audits including blockchain (Solidity), system hardening, social engineering simulations, OSINT and compliance audits against ISO 27001, GDPR and PCI DSS. Team certifications include OSCP, OSCE, CEH, CISSP, CISM and GPEN.
BlackBox Pentesters Ltd
BlackBox Pentesters is a UK-based cyber security testing company providing penetration testing across web applications, APIs, cloud environments, AI systems, internal networks and users, alongside advanced red teaming. Assessments are scoped and delivered by senior consultants, with clear reporting and practical remediation guidance. Monthly subscription plans let organisations spread costs and receive regular testing throughout the year.
CODA Security Limited
CODA Security Limited is a cyber security consultancy based in Leamington Spa, Warwickshire. The company provides bespoke services including penetration testing to find and exploit weaknesses in systems, technical assurance to identify organisational vulnerabilities, and threat simulation to test detection and response against real-world attacks. Consultant teams are led by experienced Principal Consultants with specialist qualifications, with services tailored to individual client needs.
Census Labs UK
Census Labs UK delivers cybersecurity engineering services across cloud, device, web and mobile platforms. Three core practices cover security assessment across these platforms, secure system design through hardware architecture, encryption protocols and secure APIs, and hardened build through secure enclave, SecureComms libraries and confidential computing containers. The firm conducts vulnerability research using fuzzing, reverse engineering and code analysis. Tiger Team operations test security across technology, personnel, processes and physical facilities. Products include Golden Eagle and the Cryptellum post-quantum cryptography library.
Coalfire
Coalfire provides cybersecurity and compliance services, including FedRAMP and CMMC advisory, compliance automation and audit services, and penetration testing. The company runs threat-focused security assessments through its DivisionHex team and holds C3PAO accreditation for CMMC federal assessments. Its advisory practice covers cloud engineering and healthcare risk, and its assessment platform coordinates audits across more than 85 compliance frameworks for enterprise and technology clients.
Cognisys
Cognisys provides cybersecurity consulting, penetration testing and vulnerability management services for businesses working towards ISO 27001 and SOC 2 compliance. The company is based in Leeds and supports organisations in identifying security weaknesses and managing vulnerabilities across their systems. Cognisys structures its consulting work around helping clients meet recognised information security standards rather than providing a single one-off assessment, combining penetration testing with ongoing vulnerability management support for businesses at different stages of their security programme.
CyberGaar
CyberGaar is a cyber security company in Cheltenham providing security audits, penetration testing and vulnerability scanning to help organisations understand and reduce cyber risk. Services include manual penetration testing across web, mobile, network, cloud, wireless and social engineering; web application and API testing; cloud security reviews; and readiness support for Cyber Essentials, ISO 27001, SOC 2 and PCI DSS. It serves sectors including financial services, healthcare, technology and critical infrastructure.
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