Company lists · Data refreshed October 2026

Top 24 Integration marketing agencies based in London, United Kingdom

Name: Integration 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 6,718 companies tracked

RevenueBase identified 6,718 company matches for integration marketing agencies associated with London, United Kingdom as of October 2026 and tracks 139,265 professional contacts across them, including 30,282 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for integration 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

6,718Companies

139,265Contacts tracked

30,282Verified emails

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The 24 largest integration marketing agencies based in London, United Kingdom

Ranked by team size

Top 24 of 6,718 company matches for integration 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	Publicis Media	Exact match	London, United KingdomHQ recorded Oct 1, 2026	10001+	6,901 contacts →
	Exact match “Publicis Media harnesses the power of modern media through leading agency brands Dysrupt, Infinite Roar, Publicis Collective, Publicis Health Media, Spark Foundry, Starcom and…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
2	Clinic	Exact match	London, United KingdomHQ recorded Oct 1, 2026	n/a	5,287 contacts →
	Exact match “Clinic is an independent creative agency.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
3	Zenith	Exact match	London, United KingdomHQ recorded Oct 1, 2026	5,001-10,000	4,133 contacts →
	Exact match “Zenith is the ROI Agency.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
4	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
5	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
6	CARAT	Exact match	London, United KingdomHQ recorded Oct 1, 2026	5,001-10,000	2,182 contacts →
	Exact match “Carat is the world’s first media agency and is privileged to work with some of today’s most storied and innovative brands.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
7	Jellyfish	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1,001-5,000	2,119 contacts →
	Exact match “Jellyfish \| Move Faster.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
8	OI	Exact match	London, United KingdomHQ recorded Oct 1, 2026	n/a	1,891 contacts →
	Exact match “We make content more rewarding.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
9	We ARE Social	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1,001-5,000	1,728 contacts →
	Exact match “We are a global socially-led creative agency, with unrivaled social media expertise.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
10	Omnicom Media Group UK	Exact match	London, United KingdomHQ recorded Oct 1, 2026	5,001-10,000	983 contacts →
	Exact match “OMG UK delivers transformational experiences for consumers, clients and talent.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
11	Dentsu X	Exact match	London, United KingdomHQ recorded Oct 1, 2026	5,001-10,000	941 contacts →
	Exact match “Welcome to dentsu X.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
12	T&p	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1,001-5,000	925 contacts →
	Exact match “A global, fully integrated agency with AI at its heart.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
13	VCCP	Exact match	London, United KingdomHQ recorded Oct 1, 2026	501-1,000	820 contacts →
	Exact match “VCCP is the global challenger network for challenger brands.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
14	Digitas UK	Exact match	London, United KingdomHQ recorded Oct 1, 2026	501-1,000	709 contacts →
	Exact match “We are Digitas.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
15	CROUD	Exact match	London, United KingdomHQ recorded Oct 1, 2026	501-1,000	643 contacts →
	Exact match “We're an independent global media, creative, and data agency helping our clients make their next best move.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
16	Influencer	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	640 contacts →
	Exact match “Influencer is a global creator marketing agency on a mission to shape the future of marketing by humanizing brands.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
17	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
18	MG OMD	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	527 contacts →
	Exact match “MG OMD, part of Omnicom Media, brings innovation, insight and creativity to the world of media.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
19	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
20	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
21	M C Saatchi Performance	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	457 contacts →
	Exact match “We are a Global digital media agency specializing in taking a human approach to connecting brands with people across all channels.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
22	SMG	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	455 contacts →
	Exact match “We’re the original pioneers in connected commerce marketing.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
23	TMW	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	439 contacts →
	Exact match “TMW, part of Accenture Song, is an integrated creative agency.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
24	Gravity Global	Exact match	London, United KingdomHQ recorded Oct 1, 2026	501-1,000	422 contacts →
	Exact match “Hi, we're Gravity - the world’s most awarded brand-to-demand marketing agency!” 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 “integration 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 24 of 6,718 integration marketing agencies based in London, United Kingdom

See the full list, filter by size, metro and specialty, and access 30,282 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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

As of Oct 1, 2026

21.7%Verified-email coverage

20.7Average contacts per company

1-10Median size (employees)

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

4,341

11-50

1,816

51-200

395

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 6,718 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 “integration 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 30,282 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.

Integration 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 “integration marketing agencies”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 6,718 company matches for integration 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?

Publicis Media 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 integration marketing agencies?

London leads the United Kingdom with 6,718 company records, followed by Manchester (750) and Birmingham (407).

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 30,282 professional contacts with verified work emails tracked across these 6,718 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.