Top Marketing tech companies in London

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

Edit the query above, or pick a refinement. 500 free credits on sign-up, no card needed.

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
WPP· London, England, United Kingdom
- 59.4k employees
- Founded 1985
2
Kantar· London, England, United Kingdom
Kantar is the world’s leading marketing data and analytics business. We deliver the intelligence needed to power brand growth. We provide the signals that help organisations act quickly and confidently. We empower brands to make effective marketing decisions based on predictive evidence. And we help them craft powerful growth strategies rooted in the connection between consumers, brands and enterprise value.All this is powered by our uniquely robust human and synthetic data, our unrivalled IP, our AI-native platform and the team of global brand experts that bring this all together.
- Debt
- 24.9k employees
- Founded 1992
3
Clinic· London, England, United Kingdom
Clinic is an independent creative agency. We create bold ideas, and craft them beautifully, to get people thinking, believing and doing.All of our experience goes into what we do today, and although our world’s constantly changing, the endpoint is still people and their experience, no matter what the context or media.Born a Virgin company, the core principles of challenging the norm and putting people front and centre have served us well over the years. And they’ve served the many brands we’ve worked with even better.What does that mean in the real world? Launching products & services, increasing subscriber numbers, helping multi-faceted businesses feel human and showing brands how to be themselves.Whatever we’re doing, the core is understanding people and solving problems creatively. It’s what we’ve done for over 30 years, and it still drives us forward. We call it being something else.
- 19.7k employees
- Founded 1983
Live search
This list is a starting point
I can run a natural-language search across LinkedIn, GitHub, and the open web. Fire one of these, or edit the box up top to match exactly who you're after.
- Series-B Marketing tech companies in LondonRun
- Marketing tech companies in London hiringRun
500 free credits on sign-up, no card needed.
4
Clear Channel Europe· London Colney, England, United Kingdom
Clear Channel Europe is a division of leading global Out of Home media company, Clear Channel Outdoor Holdings, Inc. (NYSE: CCO). The Clear Channel Europe portfolio spans 14 markets with 260,000 advertising panels. Clear Channel Europe has 2,600 dedicated employees. Our Mission is To Create the future of media. Transforming our estate, to the benefit of all our stakeholders, through data-driven innovations and infrastructure. Our Purpose is to provide both A Platform for Brands & A Platform for Good. Delivering advertisers’ media objectives whilst having a positive impact on the world around us.
- 15.2k employees
- Founded 1901
5
Publicis Media· London, England, United Kingdom
Publicis Media harnesses the power of modern media through leading agency brands Dysrupt, Infinite Roar, Publicis Collective, Publicis Health Media, Spark Foundry, Starcom and Zenith, as well as global accelerator PMX; immersive experience group PMCI (inclusive of Picture Motion and RDL Worldwide); and access to integrated platform-based technologies and offerings from CJ, Epsilon and Influential. A key business solution of Publicis Groupe ([Euronext Paris FR0000130577, CAC 40]), Publicis Media’s digital-first, data-driven global solutions deliver client value and drive growth in a platform-powered world. It is present in over 100 countries with over 23,000 employees worldwide.
- 11.2k employees

6
HH Global· London, England, United Kingdom
HH Global is the global leader in tech-enabled creative production and procurement. With more than 4,500 team members, 26 creative studios and over 5,800 strategic supplier partners present in 64 countries, we work with the best talent across the world to partner with our clients to create big impact through big ideas. Visit https://www.hhglobal.com/ to learn more.
- Debt
- 8.6k employees
- Founded 1991
7
Mindshare· London, England, United Kingdom
Mindshare is a media services brand that accelerates Good Growth for its clients in the age of transformation. Good Growth is business growth that is enduring and sustainable whilst also helping to shape society and the world for the better. We accelerate Good Growth for our clients by using Precisely Human Intelligence that combines data science and behavioural science to understand consumers and their motivations better and we act on that intelligence through the intentional use of media, connecting brands with consumers around their shared values. We were the first purpose built company created by WPP and today our 10,000 people operate in 116 offices in 86 countries, helping to drive Good Growth for our clients, our people, the industry and the world.
- 6.6k employees
- Founded 1997
8
Monks· London, England, United Kingdom
Monks combines an extraordinary range of global marketing and technology services to accelerate business possibilities and redefine how brands and businesses interact with the world. It delivers unfettered content production, scaled experiences, enterprise-grade technology and data science fueled by AI to help the world’s trailblazing companies outmaneuver and outpace their competition.
- 6.4k employees
- Founded 2002
9
Zenith· London, England, United Kingdom
Zenith is the ROI Agency. Our more than 6,000 specialists across 95 markets offer unparalleled capabilities in Media, Data, Technology, Commerce and Content. We put effectiveness at the heart of our work to solve complex challenges, drive successful business outcomes, and grow our clients’ businesses. Zenith is part of Publicis Media, the media arm of Publicis Groupe [Euronext Paris Fr0000130577, CAC40].
- Series A
- 5.4k employees
- Founded 1988
10
Department of Health and Social Care· London, England, United Kingdom
The Department of Health and Social Care helps people to live better for longer. We lead, shape and fund health and care in England, making sure people have the support, care and treatment they need, with the compassion, respect and dignity they deserve.The Department of Health and Social care sets the direction and coordinates action across the health and care system: public health and adult social care as well as the NHS. We create national policies and legislation, providing the long term vision and ambition to meet current and future challenges, and act as a global leader in health and care policy. We work with our partners to ensure everyone can access the health and care they need, from supporting people to have the best start in life, to staying in good health and, where that might not be possible, supporting people to live as independently as they can and ensuring they receive the best possible care. We want to instil a culture that values compassion, dignity and the highest quality of care. We support the integrity of the system by providing funding, assuring the delivery and continuity of services, and accounting to Parliament. We champion innovation and improvement by supporting research and technology, promoting honesty, openness and transparency. Above all, we encourage staff in every health and care organisation, including our own, to understand and learn from people’s experience of health and care and to apply this to everything we do.
- 5.3k employees
- Founded 1919

Reveal 3,929 more·500 free credits, no card

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 3,934 matching companies in Refolk’s index, this is a good map of where the Marketing tech talent in London lives - 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 London hiring senior staff” or “founders of Marketing tech companies in London who 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: Wed, 05 Aug 2026 14:03:24 GMT

Search this list

Need an even more specific search?

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

500 free credits on sign-up, no card needed.

Related lists

See all company lists.

Or zoom out

Common questions

How is this ranking built?

The list draws on the public company graph - headcount and growth signals, funding history, and recency. The criteria chips at the top show exactly which filters produced it, and the methodology section explains the ranking.

How fresh is the data?

The underlying index updates continuously and this page re-renders at least daily. Last refreshed: Wed, 05 Aug 2026 14:03:24 GMT.

Can I get the full list of 3,934 companies?

Yes. This page shows the top of the ranking; sign up and I'll run the search live for the complete, current list. You start with 500 free credits, no card required.

Can I find the people inside these companies?

Yes. Ask in plain English - for example "engineering leaders at these companies who joined in the last year" - and I return the specific people, with context on each.

Try it on your own search

Stop building boolean strings. Just describe the person.

Type one sentence and I plan the search, read GitHub, public LinkedIn and Crunchbase records, and the open web live, then hand back a ranked shortlist with the reasoning behind every name. No filters to learn, no export to clean up, no sales call to sit through.

One sentence in, a ranked shortlist out. No boolean, no filters, no seat to buy.
Read live at search time, not from a database that went stale last quarter.
Watch every step as it runs, and see why each name made the list.

500 free credits on sign-up. No card, no demo call. See real searches.

This list is a starting point