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Top Marketing tech companies in London

Tools for marketers: CRM, attribution, content, ads, growth, and analytics. Filtered to companies headquartered in London.

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

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

  1. 1
    WPP· London, England, United Kingdom
    • 41.3k employees
    • Founded 1985
  2. 2
    Kantar· London, England, United Kingdom
    • Debt
    • 25k employees
    • Founded 1992
  3. 3
    Clinic· London, England, United Kingdom
    • 19.2k employees
    • Founded 1983
  4. 4
    Clear Channel Europe· London Colney, England, United Kingdom
    • 15.2k employees
    • Founded 1901
  5. 5
    Publicis Media· London, England, United Kingdom
    • 11k employees
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Find engineers at Marketing tech companies in London

London has long been a hub for Marketing tech, and the list above ranks the largest Marketing tech companies headquartered there by current headcount, drawn from public LinkedIn and Crunchbase records. With 3,857 matching companies in our index, this is a good map of where the Marketing tech talent in Londonlives - useful whether you’re recruiting, partnering, or sizing a market.

The biggest Marketing tech 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 “Marketing tech engineers in Londonhiring senior staff” or “founders of Marketing tech 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 Marketing tech 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 09:36:52 GMT

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