Locked Stack is an independent cybersecurity consultancy and managed services firm headquartered in London, with a US subsidiary, operating across North America, Europe, and the UK.

We specialise in payment security and broader risk management, delivering structured advisory and managed services that support regulatory and industry standards across business and technology environments. Our capabilities span PCI DSS, PCI 3-D Secure (3DS), ISO/IEC 27001 and 27002, GDPR, DORA, GLBA, NIST, HIPAA, and the UK Data Protection Act.

Payment card security is central to Locked Stack’s offering. Our team has practical, end-to-end experience across the payments ecosystem, working with issuers, acquirers, card networks, and third-party service providers.

We support organisations ranging from growing enterprises to public sector bodies, delivering repeatable and sustainable compliance programmes designed to provide measurable, long-term value. Our technology-assisted approach reduces assessment effort, shortens compliance timelines, and supports ongoing regulatory alignment.

Our consultants bring extensive real-world experience in security assurance, risk management, and regulatory delivery, with backgrounds in global enterprise environments. This depth of experience enables us to address complex security and compliance challenges with confidence and scale.

Locked Stack

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