Company lists · Data refreshed October 2026

Top 25 International marketing agencies based in London, United Kingdom

Name: International marketing agencies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 4,562 companies tracked

RevenueBase identified 4,562 company matches for international marketing agencies associated with London, United Kingdom as of October 2026 and tracks 62,433 professional contacts across them, including 11,952 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for international marketing agencies associated with London, United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 1, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase SmartSearch · Exact Recorded Oct 1, 2026 How this list was built

4,562Companies

62,433Contacts tracked

11,952Verified emails

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The 25 largest international marketing agencies based in London, United Kingdom

Ranked by team size

Top 25 of 4,562 company matches for international marketing agencies based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 1, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Essencemediacom	Exact match	London, United KingdomHQ recorded Oct 1, 2026	10001+	3,692 contacts →
	Exact match “We discover the breakthroughs that brands need to win.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
2	Iprospect	Exact match	London, United KingdomHQ recorded Oct 1, 2026	5,001-10,000	2,366 contacts →
	Exact match “iProspect, a dentsu company, is a leading global digital-first media agency.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
3	Mullenlowe Global	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1,001-5,000	544 contacts →
	Exact match “Happy to see you came here to learn a little more about us!” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
4	Karla Otto	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	524 contacts →
	Exact match “WHO WE ARE Founded in 1982, Karla Otto is a full-service brand-building agency, operating from fifteen cities across the globe, Milan, Paris, London, Munich, Dubai, Riyadh…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
5	BBH London	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	504 contacts →
	Exact match “We believe in the power of difference to make a difference.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
6	The Delta Group	Exact match	London, United KingdomHQ recorded Oct 1, 2026	501-1,000	389 contacts →
	Exact match “The Delta Group is committed to service excellence in-store, outdoor and online.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
7	Bulletproof	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	358 contacts →
	Exact match “Bulletproof is the world’s largest independent brand agency, creating desire through disruption to accelerate growth, drive standout, and fuel fandom.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
8	FUSE	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	306 contacts →
	Exact match “Culturally Connected, Seriously Effective.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
9	Other Creative Limited	Exact match	London, United KingdomHQ recorded Oct 1, 2026	n/a	300 contacts →
	Exact match “other is the creative business.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
10	DMS	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	299 contacts →
	Exact match “WE ARE A GLOBAL CREATIVE DIGITAL AGENCY At DMS, we bring together a powerhouse of creative, media intelligence and digital disciplines under one roof to support world-class…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
11	The7stars	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	295 contacts →
	Exact match “the7stars is the UK’s largest independent media agency, offering the best people, the best service and the best creative media campaigns.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
12	Four Agency Worldwide	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	292 contacts →
	Exact match “Four is one of the leading independent integrated communications agencies in the UK and the Middle East.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
13	Newbase	Exact match	London, United KingdomHQ recorded Oct 1, 2026	501-1,000	282 contacts →
	Exact match “At NewBase we provide expert and independent marketing and advertising services across all media channels globally.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
14	Spring Studios	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	279 contacts →
	Exact match “Spring is a global creative agency, headquartered in Europe, devoted to creating the exceptional for the world's most prestigious brands.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
15	Kitchen	Exact match	London, United KingdomHQ recorded Oct 1, 2026	n/a	229 contacts →
	Exact match “Welcome to Kitchen.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
16	Exposure	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	214 contacts →
	Exact match “Making brands culturally relevant since 1993.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
17	BIG Group	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	177 contacts →
	Exact match “Founded in 1991, with offices in Amsterdam, Bath, Dubai and London our award-winning employee-owned company has consistently ranked as one of the UK's leading independent digital…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
18	Krow Group	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	150 contacts →
	Exact match “At krow Group, our ideas are designed to make a genuine difference, building your brand and making it easier to buy by capturing and converting people’s attention.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
19	R3	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	149 contacts →
	Exact match “R3 is now known as mediasense.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
20	Grey London	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	148 contacts →
	Exact match “We are Grey London.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
21	ART Studio	Exact match	London, United KingdomHQ recorded Oct 1, 2026	11-50	139 contacts →
	Exact match “A communication agency specialising in advertising, public relations, and digital media, Artbees' art studio has been in existence since 2006.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
22	Pablo London	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	137 contacts →
	Exact match “Pablo is a humble, ego free advertising agency.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
23	Freedman International	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	136 contacts →
	Exact match “When brands go global, marketing gets exposed.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
24	SPARK	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	134 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
25	Havas Media UK	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	133 contacts →
	Exact match “At Havas Media we believe brands mean more by bringing them closer to people.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “international marketing agencies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 4,562 international marketing agencies based in London, United Kingdom

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International marketing agencies based in London, United Kingdom at a glance

As of Oct 1, 2026

19.1%Verified-email coverage

13.7Average contacts per company

1-10Median size (employees)

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

3,121

11-50

1,133

51-200

217

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 4,562 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with London, United Kingdom whose business descriptions match “international marketing agencies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every displayed company carries at least one verified work email. RevenueBase tracks 11,952 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on October 1, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

International marketing agencies by metro in the United Kingdom

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “international marketing agencies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many international marketing agencies are there based in London, United Kingdom?

RevenueBase identified 4,562 company matches for international marketing agencies associated with London, United Kingdom as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Essencemediacom tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United Kingdom has the most international marketing agencies?

London leads the United Kingdom with 4,562 company records, followed by Manchester (470) and Birmingham (302).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 11,952 professional contacts with verified work emails tracked across these 4,562 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 1, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.