Introduction
The United Kingdom has long been a global hub for technological innovation, and in 2025, its IT sector continues to thrive as a cornerstone of the country’s economy. From powering enterprise software systems and cloud infrastructure to leading in cybersecurity, fintech, AI, and government digitisation, UK-based IT companies are making their mark across industries and borders.
As digital transformation becomes non-negotiable for modern businesses, the top UK IT companies are not only keeping pace, they’re setting global standards. These firms are helping organisations streamline operations, protect data, migrate to the cloud, and build scalable digital solutions. Whether you're a startup seeking technical support, an enterprise undergoing digital overhaul, or a public-sector organisation in need of secure digital services, these companies deliver the tools and expertise required to succeed in an increasingly connected world.
In this article, we dive deep into a curated list of the top UK IT companies in 2025. We’ve included essential details like staff size, headquarters locations, services offered, and direct website links, so you get a complete picture of what makes these firms industry leaders. You’ll also find insights into why these companies are consistently ranked among the best UK IT companies, trusted by global brands and government organisations alike.
This comprehensive list isn’t just about size or revenue; it’s about impact, innovation, and relevance in today's fast-moving tech landscape. Whether you're looking for partners, inspiration, or potential employers, this guide will help you identify the right names in the UK IT ecosystem.
Let’s explore who’s leading the digital revolution in the UK - and why they’re considered the top UK IT companies to watch this year.
Meet the Top UK IT Companies in 2025
Sage Group plc
Website: sage.com
- Staff: ~11,000 employees globally.
- Locations: HQ in Newcastle upon Tyne; offices in 23 countries.
- Core Services: Enterprise accounting/ERP software, CRM, payroll, MRP; cloud-based small-business financial systems.
- Overview: As the UK's second-largest public tech company and a top-tier ERP provider, Sage serves 6.1 million customers worldwide. Its robust cloud transition drives steady annual growth.
This makes Sage one of the leading names among the top UK IT Companies trusted by businesses of all sizes.
Canonical Ltd.
Website: canonical.com
- Staff: 1,000+ employees (remote-first, 70+ countries)
- Locations: London HQ; offices in the Isle of Man, Boston, Shanghai, Tokyo.
- Core Services: Ubuntu OS distribution/support (Ubuntu Pro, Landscape), open-source solutions, cloud infrastructure support.
- Overview: Since 2004, Canonical has anchored the global open-source ecosystem by providing commercial backing to Ubuntu, which is used in enterprise and cloud environments worldwide, making it a standout among top UK IT companies.
Computacenter plc
Website: computacenter.com
- Staff: ~20,000 (2025)
- Locations: HQ in Hatfield, servicing UK public and private sectors; global presence via FTSE 250 listing.
- Core Services: IT consulting, outsourcing, managed services, cybersecurity, infrastructure integration.
- Overview: With £6.96 billion revenue in 2024 and a 20,000-strong workforce, Computacenter stands at the forefront of UK IT service providers, delivering end-to-end enterprise IT solutions.
Softcat plc
Website: softcat.com
- Staff: ~2,459 employees (2024)
- Locations: HQ in Marlow, plus 13 UK offices.
- Core Services: IT infrastructure reseller (hardware/software), cloud computing, licensing, managed/consulting services.
- Overview: Since 1993, Softcat has grown into an FTSE 250 IT infrastructure leader with nearly £1 billion in revenue, known for strong customer service and award-winning partner status.
Agilisys
Website: agilisys.co.uk
- Staff: ~1,500 employees
- Locations: HQ in Hammersmith (London) with delivery centres across the UK.
- Core Services: Public-sector IT and business services, citizen-facing solutions, customer experience platforms, consulting.
- Overview: Founded in 1998, Agilisys is employee-owned and delivers citizen-centric digital transformation solutions to government and municipal clients across the UK
Capgemini
- Website: capgemini.com
- Staff: ~340,000 employees globally, ~15,000+ in the UK
- Locations: Major UK offices in London, Manchester, Edinburgh
- Core Services: IT consulting, cloud migration, AI & analytics, digital transformation, cybersecurity
- Overview: A global giant and key player among the top UK IT companies, Capgemini partners with enterprises and governments to drive digital innovation. Their strong UK footprint in cloud, AI, and cybersecurity makes them one of the best UK IT companies for large-scale transformation projects.
Fujitsu UK
- Website: uk.fujitsu.com
- Staff: ~132,000 employees globally; UK staff ~10,000+
- Locations: UK HQ in Hayes (London), plus major sites in Birmingham, Leeds, Glasgow
- Core Services: IT infrastructure & managed services, consulting, cloud solutions, cybersecurity, sustainability-focused IT
- Overview: Fujitsu UK stands tall in public-sector and enterprise engagements. As one of the top UK IT companies, its sustainable digital strategies and infrastructure expertise make it a trusted partner and distinctly of the best UK IT companies.
Kainos
- Website: kainos.com
- Staff: ~3,000 employees globally; ~1,200+ in Northern Ireland & UK
- Locations: HQ in Belfast; offices across the UK & Ireland
- Core Services: Digital and Workday services, cloud adoption, AI & data analytics, enterprise software development
- Overview: Belfast-based Kainos, a FTSE 250-listed firm, is a shining example of the top UK IT companies, known for SaaS delivery and enterprise solutions. Their Workday integration services have earned them solid status among the best UK IT companies.
Company85 (Telstra)
- Website: company85.com
- Staff: ~200 in UK (part of Telstra’s 50,000+)
- Locations: HQ in City of London; hubs in Manchester, Edinburgh
- Core Services: IT transformation consulting, cloud integration, workspace services, data management, security & privacy
- Overview: As part of Telstra, Company85 brings strategic IT consultancy with a UK focus. It's recognized among the top UK IT companies for enabling business agility and secure infrastructure, standing out among the best UK IT companies for enterprise modernization projects.
Hyperoptic
- Website: hyperoptic.com
- Staff: ~1,865 employees (2022)
- Locations: Headquartered in London; network servicing 1.7 million premises across the UK
- Core Services: Fibre-to-the-premises (FTTP) broadband, digital infrastructure deployment, ISP services for residential & business
- Overview: Hyperoptic is one of the top UK IT companies leading the full-fibre broadband rollout. With its large-scale FTTP network and ISP services, it ranks among the best UK IT companies serving both consumer and enterprise connectivity needs.
Conclusion
In 2025, Sage, Canonical, Computacenter, Softcat, and Agilisys rank among the top UK IT companies, each offering distinctive strengths, from enterprise software and open-source leadership to managed IT services, infrastructure, and public-sector solutions. They exemplify what makes the best UK IT companies truly stand out: innovation, scale, customer focus, and strong market presence.
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