The United Kingdom is a global hub for IT companies, technology, and innovation. Here are some of the top 10 IT companies in the UK. This list is ranked based on their market presence, service offering, technological impact, and digital transformation. These top 10 IT companies in 2025 are shaping the future of AI, Cloud computing, Enterprise software, and Cybersecurity.

It is offering its services in both the public and private sectors. These IT companies will be the backbone of digital transformation in industries like government, healthcare, retail, education, finance, and many more. For enterprises, this will be the best guide for outsourcing software solutions.

Top 10 Best IT Companies in the UK 2025

Capita
Sage Group
Computacenter
Fujitsu UK
IBM
Accenture
Tata Consultancy Services
Infosys UK
Softcat
BT Digital and BT Enterprise

Capita

Capita is one of the United Kingdom’s biggest Information Service providers and a process outsourcing company. For both the public and private sectors, it provides solutions in data management, software development, and digital transformation. The Ministry of Defence has a contract with Capita. Across 8 countries, Capita operates its business services. It works mainly with UK and European clients.

Founded: 1984
Employees: 40,000+
Headquarters: London
Industries served: Healthcare, Financial, Government, and Education

Sage Group

Sage is one of the global leaders in ERP Software, accounting, and payroll. It manages finances for small and mid-level businesses, and more efficiently, it manages operations. Sage has customer trust in software services like Finance, Payroll, and HR. It has an important position in the SME market and has transitioned from desktop to cloud-based solutions. Key products of Sage Group are Sage Intacct, Sage Payroll, and Sage 50cloud.

Founded: 1981
Employees: 11,000
Headquarters: Newcastle upon Tyne

Computacenter

Computacenter provides services for the public sector and the private sector. It is one of the leading Information Technology companies, helping companies with data center management services, digital transformation, and workplace services. Some of its key services are IT asset management, cloud migration, and cybersecurity. It is one of the most trusted IT support partners for companies like GSK, BMW, and the UK government. Across 70 countries, it offers scalable and robust solutions. It received the best reputation award in the year 2007. It offers various benefits to its employees, like free transport, work from home, team outings, flexible timings, education assistance, and many more.

Founded: 1981
Employees: 18,000+
Headquarters: Hertfordshire

Fujitsu UK

Top digital services are offered by Fujitsu UK; the services include Data Analytics, AI, IoT, and Cloud-related services. It is one of the leading IT service suppliers to the transport, retail, defense, and public sectors. Some of its key focus areas are Artificial Intelligence Integration and the Digital Workplace. Fujitsu UK is well-known for its government contracts and mission-related systems. In the UK’s digital transformation, it plays an important role. Their key focus is on sustainability and digital transformation. It offers flexible working models for its employees.

Founded: 1960
Employees: 7,000+
Headquarters: London

IBM UK

IBM UK is an expert in different sectors and provides services in software solutions, hybrid cloud, quantum computing, and Artificial Intelligence. Across public sectors, finance, and healthcare, it offers digital transformation support. Some of its key products are Red Hat OpenShift, IBM Cloud, and Watson AI. IBM is one of the leading companies because of its influence in business transformation and R&D investments.

Founded: 1901
Employees: 10,000+
Headquarters: London

Accenture UK

One of the global professional service providers is Accenture. It specializes in technologies, strategy, and operations. It serves its services in the government sector, startups, and 500+ public sectors. Some of its key services are Digital platforms, Artificial Intelligence, innovation labs, and Cloud migration. In large-scale industries, Accenture is a leader and partner with companies like Google, Microsoft, and AWS.

Founded: 1950
Employees: 17,000+
Headquarters: London

Tata Consultancy Services

Tata Consultancy Services is one of the leading service providers in the UK, providing IT consulting services, Software development, and system integration. TCS’s delivery model combines resources of both onshore and offshore. It has a strong presence in Automation, AI, and digital Innovation. Key industries it serves are Logistics, Telecommunication, Banking, and Retail businesses.

Founded: 1970
Employees: 21,000+
Headquarters: London

Infosys UK

Infosys UK is well-known for its engineering excellence and for its agile method of delivery. It delivers Enterprise modernization, cloud infrastructure, digital services, and consulting. With huge investments, it is expanding its services in AI and digital training. Its key focus areas are Automation, AI, SAP, and Cloud.

Founded: 1990
Employees: 12,000+
Headquarters: London

Softcat

Softcat is an IT service provider. It focuses mainly on IT asset management, software licensing, cybersecurity, and cloud solutions. It offers its service from startups to big enterprises. It is one of the leading software companies in the UK because of its organic growth and customer-friendly approach.

Founded: 1993
Employees: 2,000+
Headquarters: Buckinghamshire
Key Clients: SMBs, Education sector, and Public sector

BT Digital and BT Enterprise

BT is a telecommunication company and also provides services like cloud hosting, IT infrastructure, business connectivity services, and security services. They focus mainly on 5G business solutions, IoT, and edge computing. It is now investing in Cloud platforms, digital innovations, and smart city integrations.

Founded: 1864
Employees: 100,000+
Headquarters: London

The top IT companies listed above are not only the leaders in the IT industry but also contribute to the digital economy of the UK and help in government initiatives and empowering businesses. These companies will meet the demands of the digital world and shape the future of the IT industry.