Top IT Consulting Firms in London: The Big Names You'll See on Every Contract

London's IT consulting market is dominated by global giants, Big Four arms, and specialist boutiques. Here's the landscape.

🏢 The Global Giants (Strategy + Delivery)

• Accenture — Largest by revenue; digital, cloud, security, strategy
• IBM Consulting — Hybrid cloud, AI, mainframe modernization
• Capgemini — French-headed; cloud, data, engineering, 5G
• DXC Technology — Infrastructure, apps, security (CSC + HPE Services)
• CGI — Canadian; gov't, banking, utilities, space
• Fujitsu — Japanese; digital transformation, HPC, quantum

📊 Big Four: Audit → Advisory → Consulting

• Deloitte — Monitor Deloitte (strategy), Cloud, Cyber, AI
• PwC — Strategy&, Digital, Risk, Tax tech
• EY — Parthenon (strategy), Tech consulting, Climate
• KPMG — Lighthouse (data/AI), Cloud, Regulatory

🇬🇧 UK-Strong / Mid-Tier

• BAE Systems Digital Intelligence — Defence, cyber, gov't
• Thoughtworks — Agile, product, modernization
• Endava — Fintech, payments, agile delivery
• Softwire — Custom software, public sector
• Equal Experts — Engineering-led, public/private
• Scott Logic — Financial services, energy, gov't

🎯 Specialist Boutiques

• Cyber: NCC Group, Context IS, MWR (now F-Secure)
• Data/AI: Faculty, Peak AI, Seldon
• Cloud Native: Container Solutions, Jetstack (Red Hat)
• Gov't Digital: Public Digital, Made Tech, TPXimpact

How to Choose

London has more IT consultants per capita than almost anywhere. Define outcome first—then pick the partner.