Refolk
BlogSign in

Top Marketing tech companies in London

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

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
    • 48.6k employees
    • Founded 1985
  2. 2
    Kantar· London, England, United Kingdom
    • Debt
    • 25.4k employees
    • Founded 1992
  3. 3
    Clinic· London, England, United Kingdom
    • 17.7k 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
    • 10.9k employees
  6. 6
    Mindshare· London, England, United Kingdom
    • 7.1k employees
    • Founded 1997
  7. 7
    Monks· London, England, United Kingdom
    • 6.5k employees
    • Founded 2002
  8. 8
    Zenith· London, England, United Kingdom
    • Series A
    • 5.4k employees
    • Founded 1988
  9. 9
    Department of Health and Social Care· London, England, United Kingdom
    • 5.2k employees
    • Founded 1919
  10. 10
    PHD· London, England, United Kingdom
    • 5.1k employees
    • Founded 2006
  11. 11
    Hogarth· London, England, United Kingdom
    • 5k employees
    • Founded 2008
  12. 12
    MediaCom· London, England, United Kingdom
    • 4.8k employees
    • Founded 2023
  13. 13
    Saatchi & Saatchi· London, England, United Kingdom
    • 4.8k employees
  14. 14
    Factory· Greater London, England, United Kingdom
    • 4.6k employees
  15. 15
    MEC· London, England, United Kingdom
    • 4.4k employees
    • Founded 2002
  16. 16
    Self Owned Business· Greater London, England, United Kingdom
    • 4.1k employees
  17. 17
    MNC· London, England, United Kingdom
    • 4k employees
    • Founded 1997
  18. 18
    Wavemaker· London, England, United Kingdom
    • 4k employees
    • Founded 2017
  19. 19
    Local Government Association· London, England, United Kingdom
    • 3.9k employees
    • Founded 1997
  20. 20
    OLIVER | The Brandtech Group· London Colney, England, United Kingdom
    • 3.8k employees
    • Founded 2009
  21. 21
    Property Marketing Agency· Greater London, England, United Kingdom
    • 3.6k employees
  22. 22
    Serial Therapist· London, England, United Kingdom
    • 3.6k employees
  23. 23
    EssenceMediacom· London, England, United Kingdom
    • 3.5k employees
    • Founded 2023
  24. 24
    Worldpanel· London, England, United Kingdom
    • 3.4k employees
    • Founded 2000
  25. 25
    Toluna· London, England, United Kingdom
    • Series unknown
    • 3.2k employees
    • Founded 2000

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 3,853 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: Thu, 07 May 2026 07:52:07 GMT

Need an even more specific search?

Refolk runs natural-language searches across LinkedIn, GitHub, and the open web. Try one of these:

Related lists

See all company lists.

Or zoom out