Company lists · Data verified August 2026

Top 25 Advertising agencies based in the United Kingdom

Name: Advertising 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 5,946 companies tracked

There are 5,946 advertising agencies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 80,072 professional contacts across them, including 21,836 with verified work emails and 7,508 with mobile numbers. London is the largest hub.

This list covers advertising agencies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

5,946Companies

80,072Contacts tracked

21,836Verified emails

7,508Mobile numbers

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The 25 largest advertising agencies based in the United Kingdom

Ranked by team size

Top 25 of 5,946 advertising 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	SGK	Manchester	5,001-10,000	3,593	1,061
2	CARAT	London	5,001-10,000	2,229	697
3	APS Group	Leicester	501-1,000	1,157	477
4	Omnicom Media Group UK	London	5,001-10,000	993	167
5	Anomaly	London	501-1,000	765	426
6	Linney	Mansfield	1,001-5,000	651	450
7	MG OMD	London	201-500	553	332
8	Mullenlowe Global	London	1,001-5,000	547	21
9	BBH London	London	201-500	518	204
10	Ogilvy UK	n/a	501-1,000	499	344
11	OMD UK	London	201-500	475	284
12	TMW	Bristol	201-500	442	163
13	Essencemediacom UK	Leeds	501-1,000	416	258
14	Grapes Worldwide	London	201-500	396	74
15	DRPG	Windsor	201-500	341	215
16	Orion Worldwide	London	201-500	299	187
17	The7stars	London	201-500	296	196
18	Newbase	London	501-1,000	282	28
19	Forsman & Bodenfors	London	201-500	257	179
20	Jaywing	Leeds	501-1,000	233	103
21	Bray Leino	Harefield	201-500	184	102
22	Amplify	London	201-500	180	123
23	Havas London	London	201-500	163	76
24	Grey London	London	201-500	158	69
25	Krow Group	Norwich	201-500	149	1

Showing 25 of 5,946 advertising agencies based in the United Kingdom

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Advertising agencies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 2236 HQs

7,508Contacts with mobile numbers

136Emails re-verified in last 30 days

Companies by employee count

1-10

4,114

11-50

1,436

51-200

240

201-500

501-1,000

1,001-5,000

5,001-10,000

Advertising agencies by metro

Metro	Companies
Advertising agencies in London	2236
Advertising agencies in Manchester	216
Advertising agencies in Birmingham	115
Advertising agencies in Leeds	111
Advertising agencies in Bristol	77
Advertising agencies in Edinburgh	71
Advertising agencies in Glasgow	68

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 “advertising 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; 136 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 advertising agencies are there based in the United Kingdom?

There are 5,946 advertising agencies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

SGK, headquartered in Manchester, tops this list with the largest team on record.

Which city has the most advertising agencies?

London leads with 2236 headquartered companies, followed by Manchester (216) and Birmingham (115).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 21,836 verified decision-maker contacts tracked across these 5,946 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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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.