Most Active AI Infrastructure Investors in London 2026

15 firms writing AI Infrastructure checks in London, led by Khosla Ventures, Alante Capital, Atmos Ventures — ranked by verified deal count.

AI Infrastructure in London accounts for 13 tracked companies with verified cap-table data, 13 of which disclose round sizes totalling $4.2B. The median disclosed raise is $185M, and the largest is Improbable at $902M, ahead of ElevenLabs ($781M) and Fluidstack ($750M).

The names that recur most often on these ai infrastructure cap tables are Andreessen Horowitz (2 companies), NEA (2 companies), Taavet Hinrikus (2 companies), David Rutter (1 company), Chris Dixon (1 company), Charlie Sandor (1 company). By latest disclosed round, the market skews Series A (4), Series D (2), Series E (2), Series B (2).

Best funded AI Infrastructure in London companies

  1. Improbable — $902M (latest: Other Equity)
  2. ElevenLabs — $781M (latest: Series D)
  3. Fluidstack — $750M (latest: Series A)
  4. Entrepreneurs First — $473M (latest: Series D)
  5. Synthesia — $330M (latest: Series E)
  6. PolyAI — $206M (latest: Series B)
  7. Tractable — $185M (latest: Series E)
  8. Ori Industries — $180M (latest: Growth)
  9. PhysicsX — $135M (latest: Series B)
  10. Stability AI — $101M (latest: Series A)
  11. Stacks — $88M (latest: Series A)
  12. Encord — $50M (latest: Series C)
  13. Runware — $50M (latest: Series A)

Sector × city funding reports (20)

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