Pen Test Partners
The UK's largest independent security testing firm, renowned for IoT/OT research, CBEST red teaming, and CHECK/CREST-accredited penetration testing across all sectors.
Featured in: Best CREST Pen Testing Companies
Key facts
- Founded in 2010.
- Headquartered in Buckingham, United Kingdom.
- Team of 51-200 security professionals.
- Holds CREST, CHECK, CBEST, STAR, ISO 27001, Cyber Essentials, Cyber Essentials Plus, and PCI QSA accreditation.
- Delivers 14 penetration testing services.
- Operates globally, with delivery across the UK, Europe, and North America.
- Specialises in Adversary Simulation, OT/ICS Security, and Payment Security.
- Compliance expertise across ISO 27001, PCI DSS, GDPR, NIS 2, and DORA.
About
Pen Test Partners is the largest independent security testing and consultancy business in the United Kingdom, founded in 2010 and headquartered in Buckingham with additional offices in New York. With over 100 UK-based employees, the firm has built an exceptional reputation for deep technical penetration testing, IoT and operational technology security research, and threat-led red teaming under the CBEST, GBEST, STAR-FS, and TIBER frameworks. Their research team regularly discloses vulnerabilities in connected devices, maritime systems, aviation technology, and automotive platforms, making them one of the most publicly visible and research-driven security firms in Europe.
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