Brands we have helped secure:
Built for Regulated Financial Institutions
Structured, multi-layered protection built to adapt as new cyber threats emerge. We strengthen resilience with a clear cyber security strategy shaped around your operations and long-term growth.
CISSP-led security experts with two decades of experience delivering risk management, defence against cyber attacks & practical guidance across financial, trading, enterprise environments.
Detail-driven support from a trusted cyber security expert. We provide actionable, clear & practical guidance to keep your security improvements consistent, effective and aligned with your needs.
Flexible cyber security services delivered onsite in London for key engagements or remotely for fast and seamless ongoing support. Contact us for cyber security consulting solutions.
Our mission is to help organisations reduce cyber risk through clear, practical, and proportionate security advice that supports real business objectives.
We prioritise controls that genuinely reduce cyber risk and withstand regulatory scrutiny, focusing on practical, proportionate security rather than superficial compliance or checklist driven activity.
We align cyber security with business objectives, risk appetite, and regulatory obligations, enabling informed decision making that balances resilience, compliance, and operational effectiveness.
We explain cyber risk, control effectiveness, and priorities in clear, plain English, ensuring boards, senior leaders, and regulators understand what matters and why.
We provide objective, vendor neutral advice grounded in evidence and risk, supporting strong governance, accountability, and regulator confidence in security decision making.
We help organisations build sustainable security capability through continuous improvement, supporting long term resilience as regulatory expectations and threat landscapes evolve.
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Ninth Seat
“Onion Security worked alongside our existing IT supplier to provide an independent and constructive view of our security position. Their assessment helped us understand where we could strengthen our controls and prioritise future improvements. The guidance they provided was clear, practical and collaborative throughout. We now have a well-defined roadmap that supports our ongoing security strategy, and we are keen to work with them again to ensure we stay ahead of the ever-changing security threats."
Tim Gowing
FryerMiles
"Working with Onion Security has given us greater clarity and structure around how we protect candidate and client information. They made a real effort to understand the flow of data within our recruitment operations and offered guidance that suited the way our teams work. Their steady, knowledgeable support has strengthened our overall approach to security, and we value their ongoing role in helping us maintain strong and compliant practices."
Leo Miles
SportsFi
"Onion Security have been instrumental in guiding us through our ISO 27001 and SOC 2 journey. Their expertise, combined with effective tooling solutions, has helped us build clear and manageable compliance processes. We value the reassurance and support they provide at each stage, and they continue to play a key role in our ongoing security and compliance work."
Justin King
Cunningham Eves Solicitors
"Onion Security supported our firm with clear, practical advice focused on safeguarding client confidentiality and meeting the expectations of our regulators. They quickly understood the nature of our legal work and provided guidance that fitted seamlessly with our existing processes. Their professionalism and measured approach have given us greater confidence in our security arrangements, and they remain a trusted resource for ongoing security and compliance matters."
Christine Eves
Construction Dynamics Solutions
“Onion Security invested the time to understand our firm, our workflows and the expectations of our clients. This allowed them to tailor their support precisely to our needs and provide guidance that was both practical and proportionate. Their work has helped us strengthen our security posture and gain clearer oversight of our compliance obligations. We value their measured, professional approach and are pleased to have them as our trusted security and compliance partner.”
Sam Mattar
Codertonic
"Onion Security provides expert support across our security and compliance needs, including thorough penetration testing that offers valuable insight and assurance. Their advice is clear, reliable and aligned with the way we work, which strengthens our approach without disrupting our development process. They have become a trusted partner for security matters, and I would not hesitate to recommend them."
Chris Hoyes
Your Trusted Partner
