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Top AI companies in London

Companies building AI products, foundation models, and applied ML platforms. Filtered to companies headquartered in London.

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Built from a search like: “Top AI companies in London”

Ranked by current headcount across AI companies headquartered in London. Refreshed daily.

  1. 1
    UCL· London, England, United Kingdom
    • Grant
    • 24.7k employees
  2. 2
    King's College London· London, England, United Kingdom
    • Grant
    • 20.7k employees
  3. 3
    Imperial College London· London, England, United Kingdom
    • Grant
    • 18.1k employees
    • Founded 1907
  4. 4
    Google DeepMind· London, England, United Kingdom
    • Series A
    • 9.5k employees
    • Founded 2010
  5. 5
    The Francis Crick Institute· London, England, United Kingdom
    • Convertible note
    • 1.9k employees
    • Founded 2011
Reveal 667 more·100 free credits, no card

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 672 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

Refolk pulled AI companies headquartered in London from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 10 employees. The list refreshes once a day.

Last refreshed: Sun, 21 Jun 2026 10:37:47 GMT

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