Company lists · Data refreshed October 2026

Top 25 Integrated advertising agencies based in London, United Kingdom

Name: Integrated advertising 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 1,598 companies tracked

RevenueBase identified 1,598 company matches for integrated advertising agencies associated with London, United Kingdom as of October 2026 and tracks 77,572 professional contacts across them, including 17,575 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for integrated advertising 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

1,598Companies

77,572Contacts tracked

17,575Verified emails

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The 25 largest integrated advertising agencies based in London, United Kingdom

Ranked by team size

Top 25 of 1,598 company matches for integrated advertising 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	HH Global	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1,001-5,000	5,657 contacts →
	Exact match “HH Global is the global leader in tech-enabled creative production and procurement.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
3	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
4	Hogarth	Exact match	London, United KingdomHQ recorded Oct 1, 2026	5,001-10,000	5,273 contacts →
	Exact match “Born to make the best work, brilliantly.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
5	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
6	Mediacom	Exact match	London, United KingdomHQ recorded Oct 1, 2026	5,001-10,000	3,247 contacts →
	Exact match “Hello.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
7	Saatchi & Saatchi	Exact match	London, United KingdomHQ recorded Oct 1, 2026	5,001-10,000	2,944 contacts →
	Exact match “Saatchi & Saatchi is a leading global communications and advertising network known for its impactful creative ideas that generate powerful emotional connections between consumers…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
8	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
9	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
10	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
11	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
12	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
13	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
14	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
15	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
16	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
17	OMD UK	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	463 contacts →
	Exact match “OMD is the world’s largest media network, with more than people working across more than 100 countries.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
18	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
19	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
20	Essencemediacom UK	Exact match	London, United KingdomHQ recorded Oct 1, 2026	501-1,000	416 contacts →
	Exact match “EssenceMediacom is WPP Media's newest and largest agency, committed to delivering breakthroughs for brands in the New Communications Economy.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
21	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
22	M C Saatchi Group	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1,001-5,000	372 contacts →
	Exact match “M+C Saatchi Group is a global creative solutions company and the world’s largest independent creative network.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
23	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
24	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
25	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

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 “integrated advertising 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 1,598 integrated advertising agencies based in London, United Kingdom

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Integrated advertising agencies based in London, United Kingdom at a glance

As of Oct 1, 2026

22.7%Verified-email coverage

48.5Average contacts per company

1-10Median size (employees)

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

879

11-50

487

51-200

137

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 1,598 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 “integrated advertising 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 17,575 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.

Integrated advertising 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 “integrated advertising agencies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many integrated advertising agencies are there based in London, United Kingdom?

RevenueBase identified 1,598 company matches for integrated advertising 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 integrated advertising agencies?

London leads the United Kingdom with 1,598 company records, followed by Manchester (136) and Leeds (91).

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 17,575 professional contacts with verified work emails tracked across these 1,598 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.