Top Marketing tech companies in London
Tools for marketers: CRM, attribution, content, ads, growth, and analytics. Filtered to companies headquartered in London.
- IndustryMarketing tech
- HQLondon
- Matches3,853
Built from a search like: “Top Marketing tech companies in London”
Ranked by current headcount across Marketing tech companies headquartered in London. Refreshed daily.
- 1WPP· London, England, United Kingdom
- 48.6k employees
- Founded 1985
- 2Kantar· London, England, United Kingdom
- Debt
- 25.4k employees
- Founded 1992
- 3Clinic· London, England, United Kingdom
- 17.7k employees
- Founded 1983
- 4Clear Channel Europe· London Colney, England, United Kingdom
- 15.2k employees
- Founded 1901
- 5Publicis Media· London, England, United Kingdom
- 10.9k employees
- 6Mindshare· London, England, United Kingdom
- 7.1k employees
- Founded 1997
- 7Monks· London, England, United Kingdom
- 6.5k employees
- Founded 2002
- 8Zenith· London, England, United Kingdom
- Series A
- 5.4k employees
- Founded 1988
- 9Department of Health and Social Care· London, England, United Kingdom
- 5.2k employees
- Founded 1919
- 10PHD· London, England, United Kingdom
- 5.1k employees
- Founded 2006
- 11Hogarth· London, England, United Kingdom
- 5k employees
- Founded 2008
- 12MediaCom· London, England, United Kingdom
- 4.8k employees
- Founded 2023
- 13Saatchi & Saatchi· London, England, United Kingdom
- 4.8k employees
- 14Factory· Greater London, England, United Kingdom
- 4.6k employees
- 15MEC· London, England, United Kingdom
- 4.4k employees
- Founded 2002
- 16Self Owned Business· Greater London, England, United Kingdom
- 4.1k employees
- 17MNC· London, England, United Kingdom
- 4k employees
- Founded 1997
- 18Wavemaker· London, England, United Kingdom
- 4k employees
- Founded 2017
- 19Local Government Association· London, England, United Kingdom
- 3.9k employees
- Founded 1997
- 20OLIVER | The Brandtech Group· London Colney, England, United Kingdom
- 3.8k employees
- Founded 2009
- 21Property Marketing Agency· Greater London, England, United Kingdom
- 3.6k employees
- 22Serial Therapist· London, England, United Kingdom
- 3.6k employees
- 23EssenceMediacom· London, England, United Kingdom
- 3.5k employees
- Founded 2023
- 24Worldpanel· London, England, United Kingdom
- 3.4k employees
- Founded 2000
- 25Toluna· 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
Last refreshed: Thu, 07 May 2026 07:52:07 GMT
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