Expertise
We help organisations in highly regulated and operationally complex environments deliver meaningful and strategic change — combining deep sector expertise with trusted, cutting-edge technology. Our goal is to accelerate performance, unlock productivity, and create long-term value.
As the only Channel Island provider offering a combination of Advisory, Technology and Assurance solutions our goal is to help our clients achieve theirs, by driving strategy, accelerating change and unlocking productivity - enabling them to thrive.
Trust & Corporate Services (TCSPs) & Family Offices
We understand the outcomes many TCSPs are working toward, be it improved productivity, stronger client experiences, better risk management, or sustainable value.
These goals are shaped by drivers such as regulation, geopolitical change and ESG—and delivered through the smart use of enablers like AI, data, and cloud infrastructure.
In a sector built on trust and confidentiality, AI and cybersecurity are essential. We understand how technology and in particular data and AI can supercharge growth. We also recognise that the need to ensure that client information remains safe and secure. In the face of growing cyber threats, we have the cyber security skills and experience to help.
Financial Services & Banking
In financial services, increasing regulation, digital expectations and cyber threats are reshaping priorities.
We deliver tailored AI and application solutions that enhance decision-making, improve customer experience and increase operational efficiency. Our cyber experts support financial institutions with risk assessments, secure architectures, and governance aligned to regulatory standards.
Government & Public Sector
Public bodies are under pressure to modernise services, manage risk and demonstrate impact.
We help governments deliver citizen-centric digital solutions by aligning technology with strategy. Our approach supports transparent processes, responsible resource management, and agile service delivery—all underpinned by strong governance and measurable outcomes.
Utilities
Utility providers are navigating complex challenges—from net-zero commitments to modernising operations and customer services.
Our Digital Strategy team works alongside clients to create data-driven strategies, enhance service performance, and embed scalable platforms. Whether it’s carbon targets or customer expectations, we help translate long-term vision into practical action.
Artificial Intelligence
AI is a powerful enabler across all sectors.
Our solutions—from digital assistants to process automation—improve efficiency, enable predictive insights, and enhance service delivery.
In trust and government sectors, we help automate compliance, streamline service workflows and optimise resource use—always with governance, privacy, and security built in.
Cyber Security
The threat landscape is evolving. So are we.
Our advisory services help organisations build and strengthen their cyber defences—from strategy development and policy design to board-level awareness and governance. We tailor frameworks that align with business goals and regulation, keeping your organisation secure, resilient and ready.
Our Ethos: Think Big. Start Small. Move Fast.
This principal shapes how we work. We build and deliver scalable initiatives that align with your organisational goals—helping you achieve quick wins, iterate quickly, and stay adaptable in a changing world.
Company News, Insights & Events
View AllIT support for States of Guernsey
IT support for States of Guernsey staff will be provided by C5 Alliance from 1st August 2025, as part of a new two-year agreement. Following its decision to terminate its contract with Agilisys, this agreement with C5 Alliance is the first as part of the government’s new multi-vendor model; meaning services and projects will be delivered by a range of providers rather than one.
Embracing the Future of Design in an AI-Powered World
As AI-powered tools like ChatGPT redefine how we interact with technology, professionals across industries are reflecting on how their skills and roles need to evolve to stay relevant and impactful.
Cyber-Secure IT
C5 Alliance Delivers Cyber-Secure IT for a Changing Threat Landscape. By taking a multi-layered detection approach, our enhanced Managed Services proposition is designed to give our clients greater peace of mind
Measurable Outcomes. Meaningful Change.
Deep Sector Insight
We understand your world and your challengesIsland-Based. Globally Connected.
On-the-ground expertise enhanced by a global networkConfidence in Compliance
Stay audit-ready with built-in regulatory controlsFaster Decisions, Less Guesswork
Empowering leadership with real-time data and clear insight