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Company lists · Data refreshed September 2026

Top 25 Marketing outsourcing companies based in the United Kingdom

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 12,996 companies tracked

RevenueBase identified 12,996 marketing outsourcing companies headquartered in the United Kingdom as of September 2026 and tracks 100,818 professional contacts across them, including 23,139 with verified work emails and 8,053 with mobile numbers. London is the largest hub.

This list covers marketing outsourcing companies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 5, 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 HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review
12,996Companies
100,818Contacts tracked
23,139Verified emails
8,053Mobile numbers
Unlock all 12,996 companies Free signup · no credit card · 500 free credits

The 25 largest marketing outsourcing companies based in the United Kingdom

Ranked by team size
Top 25 of 12,996 marketing outsourcing companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names marketing outsourcing companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
EssencemediacomIndirect evidence
London, United KingdomHQ checked Sep 5, 202610001+3,692

“We discover the breakthroughs that brands need to win.”

Source: company website · checked Sep 5, 2026
2
APS GroupPartial evidence
Stockport, United KingdomHQ checked Sep 5, 2026501-1,0001,152

“We’ve been delivering marketing and communications since 1961.”

Source: company website · checked Sep 5, 2026
3
Uber AgencyIndirect evidence
Leeds, United KingdomHQ checked Sep 5, 2026n/a811

“Uber means over, above more than.”

Source: company website · checked Sep 5, 2026
4
LinneyPartial evidence
Mansfield, United KingdomHQ checked Sep 5, 20261,001-5,000649

“We’re Linney, a connected marketing partner helping brands turn complexity into clarity across digital, physical and ecommerce channels.”

Source: company website · checked Sep 5, 2026
5
Ogilvy UKIndirect evidence
United KingdomHQ checked Sep 5, 2026501-1,000502

“Ogilvy UK inspires brands and people to impact the world.”

Source: company website · checked Sep 5, 2026
6
M C Saatchi PerformanceIndirect evidence
London, United KingdomHQ checked Sep 5, 2026201-500457

“We are a Global digital media agency specializing in taking a human approach to connecting brands with people across all channels.”

Source: company website · checked Sep 5, 2026
7
MVFIndirect evidence
London, United KingdomHQ checked Sep 5, 2026201-500401

“MVF powers growth for our clients by connecting them to potential customers.”

Source: company website · checked Sep 5, 2026
8
Promodo Digital AgencyPartial evidence
Lincoln, United KingdomHQ checked Sep 5, 2026201-500383

“Promodo is an award-winning performance marketing agency and a reliable partner for driving measurable results in eCommerce.”

Source: company website · checked Sep 5, 2026
9
DMSIndirect evidence
London, United KingdomHQ checked Sep 5, 202651-200299

“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…”

Source: company website · checked Sep 5, 2026
10
ADD PeoplePartial evidence
Altrincham, United KingdomHQ checked Sep 5, 2026201-500292

“We’re Add People, a team of digital marketing professionals dedicated to helping small to medium-sized businesses grow online.”

Source: company website · checked Sep 5, 2026
11
NewbasePartial evidence
London, United KingdomHQ checked Sep 5, 2026501-1,000282

“At NewBase we provide expert and independent marketing and advertising services across all media channels globally.”

Source: company website · checked Sep 5, 2026
12
FabrickPartial evidence
Maidstone, United KingdomHQ checked Sep 5, 2026n/a269

“Fabrick is the 2021 Construction Marketing Awards Agency of the Year, with 40 years’ experience specialising exclusively in the construction and built environment sectors.”

Source: company website · checked Sep 5, 2026
13
BoutiqueIndirect evidence
Leeds, United KingdomHQ checked Sep 5, 2026n/a255

“You Grow.”

Source: company website · checked Sep 5, 2026
14
KitchenIndirect evidence
London, United KingdomHQ checked Sep 5, 2026n/a229

“Welcome to Kitchen.”

Source: company website · checked Sep 5, 2026
15
Brave BisonIndirect evidence
London, United KingdomHQ checked Sep 5, 2026201-500210

“A world where complexity is the only constant demands a new breed of company.”

Source: company website · checked Sep 5, 2026
16
GO Inspire GroupPartial evidence
Leicester, United KingdomHQ checked Sep 5, 2026201-500210

“Welcome to Go Inspire - Your Marketing Performance Partner!”

Source: company website · checked Sep 5, 2026
17
Bray LeinoIndirect evidence
Devon, United KingdomHQ checked Sep 5, 2026201-500187

“Increasing the size of your business.”

Source: company website · checked Sep 5, 2026
18
ImpressionPartial evidence
Nottingham, United KingdomHQ checked Sep 5, 202651-200182

“We're a performance marketing agency setting the new standard of excellence through our people, our performance and our technology, with offices in Manchester, Nottingham, London…”

Source: company website · checked Sep 5, 2026
19
BIG GroupIndirect evidence
London, United KingdomHQ checked Sep 5, 202651-200177

“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…”

Source: company website · checked Sep 5, 2026
20
COOLRPartial evidence
London, United KingdomHQ checked Sep 5, 202651-200176

“Coolr is an award-winning social media and influencer marketing agency, with offices in London.”

Source: company website · checked Sep 5, 2026
21
Cc33 Global LimitedPartial evidence
Sheffield, United KingdomHQ checked Sep 5, 2026201-500172

“CC33 is a boutique agency with big ideas providing marketing solutions tailored to specifically meet your sales and marketing needs.”

Source: company website · checked Sep 5, 2026
22
Ics-DigitalIndirect evidence
Leeds, United KingdomHQ checked Sep 5, 202651-200168

“ICS-digital is a global SEO, content, advertising, translation & digital PR agency working in over 100 languages, across over 90 markets in the most highly regulated and highly…”

Source: company website · checked Sep 5, 2026
23
Expandi GroupIndirect evidence
London, United KingdomHQ checked Sep 5, 2026201-500155

“Expandi Group is a global leader in AdTech, MarTech and Managed Services.”

Source: company website · checked Sep 5, 2026
24
Krow GroupIndirect evidence
London, United KingdomHQ checked Sep 5, 2026201-500150

“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.”

Source: company website · checked Sep 5, 2026
25
Connective3Partial evidence
Leeds, United KingdomHQ checked Sep 5, 202651-200146

“We are a specialist performance marketing agency, and we deliver unrivalled performance for our clients on a global scale.”

Source: company website · checked Sep 5, 2026

Showing 25 of 12,996 marketing outsourcing companies based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 23,139 reachable decision-makers.

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Marketing outsourcing companies based in the United Kingdom at a glance

As of Sep 5, 2026
1-10Median size (employees)
LondonLargest hub · 3870 HQs
8,053Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
10,050
11-50
2,459
51-200
359
201-500
66
501-1,000
17
1,001-5,000
10
5,001-10,000
4
10001+
1

Verified emails by last verification

0–30
21,649
31–60
1,372
61–90
13
90–180
10
180+
95

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among marketing outsourcing companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.

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
Companies headquartered in the United Kingdom whose own description of what they do matches “marketing outsourcing companies”. Matching reads each company's description, not its industry code or its name.
What we exclude
Companies whose own description does not clearly place them among marketing outsourcing companies, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality
In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 23,139 across the full list. 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 September 5, 2026. Lists refresh periodically as the graph is re-checked.
Corrections
Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Marketing outsourcing companies by metro

Frequently asked

How many marketing outsourcing companies are there based in the United Kingdom?

RevenueBase identified 12,996 marketing outsourcing companies headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Essencemediacom, headquartered in London, tops this list with the largest team on record.

Which city has the most marketing outsourcing companies?

London leads with 3870 headquartered companies, followed by Manchester (481) and Birmingham (296).

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 23,139 verified decision-maker contacts tracked across these 12,996 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 5, 2026.

Ready to reach these companies? Verified emails and direct dials for all 12,996 marketing outsourcing companies based in the United Kingdom. Start with a free account, no credit card.

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Related lists

Browse: Companies home · All United Kingdom lists · All Marketing outsourcing companies lists · New lists

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.

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