Company lists · Data verified August 2026

Top 25 Marketing agencies based in the United Kingdom

Name: Marketing agencies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 24,805 companies tracked

This directory contains 24,805 marketing agencies based in the United Kingdom, with contact details for 269,171 people and 64,267 email addresses. As of August 2026, London is the single most-represented city among the companies listed.

Marketing agencies provide services such as strategy, branding, advertising, content, market research, and campaign management to help organizations reach and engage customers. This list covers companies that provide marketing strategy, creative, advertising, digital marketing, public relations, content, or related marketing services to clients. Ranked by team size, largest first. Data current as of August 28, 2026.

24,805Companies

269,171Contacts tracked

64,267Verified emails

25,118Mobile numbers

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The 25 largest marketing agencies based in the United Kingdom

Ranked by team size

Top 25 of 24,805 marketing agencies based in the United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	IMG	London	1,001-5,000	3,919	1,206
2	SGK	Manchester	5,001-10,000	3,593	1,061
3	Oliver The Brandtech Group	n/a	1,001-5,000	3,242	1,690
4	Iprospect	London	5,001-10,000	2,395	743
5	Mother	London	501-1,000	2,364	40
6	CARAT	London	5,001-10,000	2,229	697
7	TMS	London	1,001-5,000	1,685	684
8	MKTG	London	1,001-5,000	1,501	191
9	APS Group	Leicester	501-1,000	1,157	477
10	Omnicom Media Group UK	London	5,001-10,000	993	167
11	T&p	London	1,001-5,000	941	430
12	NP Digital	London	1,001-5,000	862	306
13	CPM UK	Thame	1,001-5,000	849	135
14	Wongdoody	London	1,001-5,000	846	472
15	Datawords Group	West End	1,001-5,000	816	1
16	Anomaly	London	501-1,000	765	426
17	Linney	Mansfield	1,001-5,000	651	450
18	Mccurrach	Glasgow	1,001-5,000	607	124
19	LS Digital Group	London	1,001-5,000	586	224
20	Mullenlowe Global	London	1,001-5,000	547	21
21	Ogilvy UK	n/a	501-1,000	499	344
22	Essencemediacom UK	Leeds	501-1,000	416	258
23	Blackjack Promotions	London	1,001-5,000	346	8
24	Newbase	London	501-1,000	282	28
25	Jaywing	Leeds	501-1,000	233	103

Showing 25 of 24,805 marketing agencies based in the United Kingdom

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Marketing agencies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 9042 HQs

25,118Contacts with mobile numbers

536Emails re-verified in last 30 days

Companies by employee count

1-10

18,285

11-50

5,289

51-200

832

201-500

143

501-1,000

1,001-5,000

5,001-10,000

Marketing agencies by metro

Metro	Companies
Marketing agencies in London	9042
Marketing agencies in Manchester	937
Marketing agencies in Birmingham	520
Marketing agencies in Leeds	445
Marketing agencies in Bristol	352
Marketing agencies in Glasgow	318
Marketing agencies in Edinburgh	280

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “marketing agencies”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
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: Contact records re-verify on a rolling cadence; 536 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many marketing agencies are based in the United Kingdom?

The directory lists 24,805 marketing agencies based in the United Kingdom.

Where can I find contact information for marketing agencies?

This directory includes contact details for 269,171 people and 64,267 email addresses associated with the listed marketing agencies.

Which city has the most marketing agencies?

London is the single most-represented city among the marketing agencies on the list.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.