Top AI companies in London
Companies building AI products, foundation models, and applied ML platforms. Filtered to companies headquartered in London.
- IndustryAI
- HQLondon
- Matches649
Built from a search like: “Top AI companies in London”
Ranked by current headcount across AI companies headquartered in London. Refreshed daily.
- 1UCL· London, England, United Kingdom
- Grant
- 24.3k employees
- 2King's College London· London, England, United Kingdom
- Grant
- 20.5k employees
- 3Imperial College London· London, England, United Kingdom
- Grant
- 17.8k employees
- Founded 1907
- 4Google DeepMind· London, England, United Kingdom
- Series A
- 8.3k employees
- Founded 2010
- 5LGC· London, England, United Kingdom
- 2.3k employees
- Founded 1996
- 6The Francis Crick Institute· London, England, United Kingdom
- Convertible note
- 1.9k employees
- Founded 2011
- 7National Physical Laboratory (NPL)· Teddington, England, United Kingdom
- 1.8k employees
- 8The Institute of Cancer Research· London, England, United Kingdom
- Grant
- 1.6k employees
- Founded 1909
- 9Royal Botanic Gardens, Kew· Richmond Upon Thames, England, United Kingdom
- 1.4k employees
- 10Perceptive Inc.· London, England, United Kingdom
- Private equity
- 1.2k employees
- Founded 1996
- 11Chatham House· London, England, United Kingdom
- 1.1k employees
- Founded 1920
- 12Institute of Physics· London, England, United Kingdom
- 869 employees
- 13National Centre for Social Research· London, England, United Kingdom
- 777 employees
- Founded 1969
- 14ElevenLabs· London, England, United Kingdom
- Series D
- 752 employees
- Founded 2022
- 15Cochrane· London, England, United Kingdom
- 696 employees
- Founded 1993
- 16Institute of Psychiatry, Psychology & Neuroscience· London, England, United Kingdom
- 675 employees
- 17The Alan Turing Institute· London Colney, England, United Kingdom
- Grant
- 598 employees
- Founded 2015
- 18Omdia· London, England, United Kingdom
- 573 employees
- Founded 2020
- 19Genomics England· London, England, United Kingdom
- 561 employees
- Founded 2013
- 20ODI Global· London, England, United Kingdom
- 561 employees
- Founded 1960
- 21Veramed· Twickenham, England, United Kingdom
- 556 employees
- Founded 2012
- 22Berlin Institute of Technology (Technische Universität Berlin)· London, England, United Kingdom
- 492 employees
- 23Legal 500· London, England, United Kingdom
- 418 employees
- Founded 1987
- 24IB· London Colney, England, United Kingdom
- 385 employees
- 25Our Future Health UK· London, England, United Kingdom
- 375 employees
- Founded 2020
Find engineers at AI companies in London
London has long been a hub for AI, and the list above ranks the largest AI companies headquartered there by current headcount, drawn from public LinkedIn and Crunchbase records. With 649 matching companies in our index, this is a good map of where the AI talent in Londonlives — useful whether you’re recruiting, partnering, or sizing a market.
The biggest AI companies in London tend to be the gravitational centres for specialised talent — senior engineers, ML researchers, applied scientists, designers — while the smaller ones compete on speed, equity, and proximity to founders.
Refolk converts this list into a live search. Ask for “AI engineers in Londonhiring senior staff” or “founders of AI companies in Londonwho left in the last 12 months” and Refolk returns a ranked shortlist with the evidence that earned each person a spot.
How this list is built
Last refreshed: Thu, 07 May 2026 06:34:27 GMT
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