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Top Blockchain companies in London

Companies building L1s, L2s, wallets, infra, and apps on public blockchains. Filtered to companies headquartered in London.

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

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

  1. 1
    HSBC· London, England, United Kingdom
    • Post-IPO debt
    • 195.4k employees
  2. 2
    Aon· London, England, United Kingdom
    • Post-IPO debt
    • 92.6k employees
    • Founded 1979
  3. 3
    Barclays· London, England, United Kingdom
    • 80.9k employees
  4. 4
    Standard Chartered· London, England, United Kingdom
    • Post-IPO debt
    • 78.6k employees
  5. 5
    Lloyds Banking Group· London, England, United Kingdom
    • 62.9k employees
    • Founded 1985
  6. 6
    WTW· London, England, United Kingdom
    • 57.3k employees
    • Founded 1950
  7. 7
    Virgin· London, England, United Kingdom
    • 36.8k employees
  8. 8
    Intertek· London, England, United Kingdom
    • Grant
    • 30.6k employees
    • Founded 1996
  9. 9
    Aviva· London, England, United Kingdom
    • Post-IPO equity
    • 26.3k employees
  10. 10
    LSEG· London, England, United Kingdom
    • post ipo secondary
    • 24.6k employees
    • Founded 2007
  11. 11
    Revolut· London, England, United Kingdom
    • Secondary
    • 16.8k employees
    • Founded 2015
  12. 12
    Howden· London, England, United Kingdom
    • Grant
    • 13.7k employees
    • Founded 1994
  13. 13
    Finastra· London, England, United Kingdom
    • Debt
    • 12.5k employees
    • Founded 2017
  14. 14
    Wise· London, England, United Kingdom
    • Post-IPO debt
    • 10.1k employees
    • Founded 2011
  15. 15
    Santander UK· London, England, United Kingdom
    • 9.8k employees
    • Founded 1988
  16. 16
    Barclays UK· London, England, United Kingdom
    • 9.8k employees
  17. 17
    Fidelity International· London, England, United Kingdom
    • 9.7k employees
    • Founded 1969
  18. 18
    Investec· London, England, United Kingdom
    • Post-IPO debt
    • 9.7k employees
    • Founded 1974
  19. 19
    Legal & General· London, England, United Kingdom
    • Post-IPO debt
    • 9.3k employees
  20. 20
    RSA· London, England, United Kingdom
    • 9k employees
    • Founded 1956
  21. 21
    Apex Group Ltd (UK & Ireland)· London, England, United Kingdom
    • 9k employees
  22. 22
    Capco· London, England, United Kingdom
    • Private equity
    • 7.9k employees
    • Founded 1998
  23. 23
    Lloyds Bank· London, England, United Kingdom
    • 7.9k employees
  24. 24
    Acuity Analytics· London, England, United Kingdom
    • Debt
    • 7.5k employees
    • Founded 2003
  25. 25
    TP ICAP· London, England, United Kingdom
    • 7.4k employees
    • Founded 1971

Find engineers at Blockchain companies in London

London has long been a hub for Blockchain, and the list above ranks the largest Blockchain companies headquartered there by current headcount, drawn from public LinkedIn and Crunchbase records. With 5,857 matching companies in our index, this is a good map of where the Blockchain talent in Londonlives — useful whether you’re recruiting, partnering, or sizing a market.

The biggest Blockchain 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 “Blockchain engineers in Londonhiring senior staff” or “founders of Blockchain 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 Blockchain 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: Thu, 07 May 2026 10:00:08 GMT

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