The United Kingdom is one of the great industrial and technological powers of the world, with its tech sector valued at over $1 trillion. Thanks to a broad collection of European unicorns, the country’s status as one of the world’s top countries for tech is well cemented. U.K. tech companies span a wide array of fields, including biotech, software, fintech, IT and industrial technology. Read on to learn about some of the biggest companies in the U.K. tech scene.
Largest Tech Companies in the UK
- Sage
- Capco
- Cloudflare
- SailPoint
- ZS
- GRAIL
- Integral Ad Science
Largest Tech Companies in the UK
ZS is a management and technology consulting firm that works with clients in healthcare and adjacent sectors. It serves enterprise organizations through strategic approaches that rely heavily on emerging technologies such as AI and machine learning. In this way, the company supports medical technology, life sciences, pharma and biotech clients.
Mastercard provides payment solutions, money transfers and advisory services for businesses, along with credit and debit cards for individuals. The company has over 1,000 employees in the U.K., many of whom work out of its office in Central London, near the Cannon Street Station.
Capco is a consultancy that works with clients in the financial services and energy industries to create digital strategies for growing and optimizing revenue, culture and other mission-critical metrics. Its work emphasizes digital transformation and the replacement of legacy systems that rely on outdated technologies.
The cybersecurity and network technology company Cloudflare enables sophisticated approaches to securing digital assets at scale. It offers tools including a content delivery network, web application firewall and DDoS defense, each of which contribute to a holistic shoring up of digital processes, access and assets. Cloudflare serves clients ranging from private individuals to governments and enterprise companies.
Samsara is an industrial technology company that offers IoT devices designed for the challenging environmental conditions associated with heavy machinery and fleet vehicles. Its AI-powered platform connects to those hardware tools to provide actionable insights and inform optimizations across productivity, safety and sustainability.
Sage offers finance and business management software solutions that feature AI capabilities to support organizations across industries including construction, healthcare, retail, financial services and hospitality. The company has multiple U.K. offices, and its Newcastle headquarters is based out of the 90,000-square-foot Cobalt Park business hub and can accommodate more than 1,000 employees.
CSC is an enterprise technology consultancy that offers direct advisement services and purpose-built software tools. Its work includes strategic corporate tax services for businesses, and to that end, it develops digital solutions that help client organizations streamline tax strategies. It also has offerings across areas like entity formation, global payroll management, fund administration and online brand protection.
Airwallex is a global fintech company that provides a financial operating system for businesses. It offers solutions for global payments, business accounts, multi-currency transactions, spend management and embedded finance APIs. Airwallex enables instant local accounts in over 60 countries and fast fund transfers across more than 150 markets. The company is moving into a larger London office at the end of 2025.
The software firm SailPoint creates SaaS tools that facilitate access and identity management for enterprise companies. These tools rely on AI to monitor and detect risks and anomalies and support optimized responses to threats. The company’s technology is built to balance data protection and compliance needs with streamlined governance workflows.
The cybersecurity specialist firm Rapid7 offers an AI-enabled platform along with consulting services to support comprehensive attack surface visibility and vulnerability management. Its multinational footprint includes office locations in Reading and Belfast.
Integral Ad Science falls in the marketing sector and specializes in the science of ad placement, which considers the memorability, favorability and brand identity associated with any given ad asset and focuses on supporting optimized viewability. Integral Ad Science offers its data-driven technology to media buyers and sellers, working with them to enable informed placement strategies for digital advertisements.
GRAIL is healthcare technology company that researches and develops solutions for medical diagnosis. Its work focuses on innovations in early cancer detection, which it approaches through multi-cancer screening protocols with its advanced Galleri test. Galleri is a screening tool that analyzes a physical sample, collected via blood test, to identify signals that can indicate the early presence of cancer cells.
