About us. World-class IT security management.

Across five continents, enterprise and government clients rely on us to defend them against cyber threats like nobody else can.

Our managed security and consultancy services support organisations throughout the challenges of assurance, awareness, detection, response and prevention, 24 x 7, and focus on business risk – securing not just assets and data, but revenues, too.

"“Reliance acsn bring a significant uplift to our cyber visibility and defence. Their predictive threat intelligence covers deep net, dark net and clear net sources. They’ve built this in house, and target it directly at risks to my business – this has resulted in several targeted campaigns being identified before they are executed, and helped to build an uplift in our overall defences.”"

— Robin Irvine, Global CIO, ABP Food Group

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A higher-quality service: established, enduring, proven

Our history goes back to 2003, with the founding of global cyber security specialist ACSN.

In 2016, a merger created Reliance acsn in London, UK, to deliver real-time Managed Detection and Response (MDR) in a new, higher-quality breed of IT security management service – agile, flexible, responsive – backed by greater human analysis and practical expertise, and, crucially, built around long-term client relationships.

In the last 17 years, we’ve helped scores of the world’s top brands plan, deploy and manage robust security solutions, in banking, telecoms, retail, government and insurance.

Accreditations and Certifications

Our people are accredited across all the major standards in IT security – including PCI, ISO27001, G-Cloud, CISSP, CREST, and many more.

Talk to us today about your IT security challenges and see how we can help.

"“The MDR services Reliance acsn deliver have reduced our exposure, and that of our local government, NHS and GP practices, significantly.”"

— Giles Letheren, CEO, Delt Shared Services

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