Company lists · Data refreshed September 2026

Top 25 Internet advertising agencies based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 26, 2026 9,966 companies tracked

RevenueBase identified 9,966 company matches for internet advertising agencies associated with the United Kingdom as of September 2026 and tracks 64,234 professional contacts across them, including 14,962 with verified work emails and 4,135 with mobile numbers. London is the largest hub.

This list covers company matches for internet advertising agencies associated with the 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 September 26, 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 Sep 26, 2026 How this list was built

9,966Companies

64,234Contacts tracked

14,962Verified emails

4,135Mobile numbers

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The 25 largest internet advertising agencies based in the United Kingdom

Ranked by team size

Top 25 of 9,966 company matches for internet advertising agencies based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 26, 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	Iprospect	Exact match	London, United KingdomHQ recorded Sep 26, 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 · Sep 26, 2026 · View company records in RevenueBase
2	YELL	Exact match	Reading, United KingdomHQ recorded Sep 26, 2026	501-1,000	1,284 contacts →
	Exact match “Since 1966, we’ve been helping UK businesses grow – from printed ads in the Yellow Pages to powerful, AI-driven digital marketing that delivers real results.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
3	M C Saatchi Performance	Exact match	London, United KingdomHQ recorded Sep 26, 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 · Sep 26, 2026 · View company records in RevenueBase
4	MVF	Exact match	London, United KingdomHQ recorded Sep 26, 2026	201-500	401 contacts →
	Exact match “MVF powers growth for our clients by connecting them to potential customers.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
5	Promodo Digital Agency	Exact match	Lincoln, United KingdomHQ recorded Sep 26, 2026	201-500	383 contacts →
	Exact match “Promodo is an award-winning performance marketing agency and a reliable partner for driving measurable results in eCommerce.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
6	ADD People	Exact match	Altrincham, United KingdomHQ recorded Sep 26, 2026	201-500	292 contacts →
	Exact match “We’re Add People, a team of digital marketing professionals dedicated to helping small to medium-sized businesses grow online.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
7	Boutique	Exact match	Leeds, United KingdomHQ recorded Sep 26, 2026	n/a	255 contacts →
	Exact match “You Grow.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
8	Brave Bison	Exact match	London, United KingdomHQ recorded Sep 26, 2026	201-500	210 contacts →
	Exact match “A world where complexity is the only constant demands a new breed of company.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
9	Kinesso Uk&i	Exact match	London, United KingdomHQ recorded Sep 26, 2026	501-1,000	194 contacts →
	Exact match “KINESSO UK is the award-winning, tech-driven performance marketing agency delivering actionable growth for direct clients and agency partners.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
10	Impression	Exact match	Nottingham, United KingdomHQ recorded Sep 26, 2026	51-200	182 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
11	ALL Response Media	Exact match	London, United KingdomHQ recorded Sep 26, 2026	51-200	178 contacts →
	Exact match “All Response Media is the leading performance media planning and buying agency.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
12	BIG Group	Exact match	London, United KingdomHQ recorded Sep 26, 2026	51-200	177 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
13	Ics-Digital	Exact match	Leeds, United KingdomHQ recorded Sep 26, 2026	51-200	168 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
14	Thomson Local	Exact match	Farnborough, United KingdomHQ recorded Sep 26, 2026	201-500	162 contacts →
	Exact match “Think Local, Think Thomsonlocal!” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
15	Investis Digital	Exact match	London, United KingdomHQ recorded Sep 26, 2026	501-1,000	158 contacts →
	Exact match “IDX (formerly Investis Digital) specializes in elevating companies and brands and maximizing technology to build strong, relatable, and authentic connections with their audiences.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
16	Expandi Group	Exact match	London, United KingdomHQ recorded Sep 26, 2026	201-500	155 contacts →
	Exact match “Expandi Group is a global leader in AdTech, MarTech and Managed Services.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
17	Connective3	Exact match	Leeds, United KingdomHQ recorded Sep 26, 2026	51-200	146 contacts →
	Exact match “We are a specialist performance marketing agency, and we deliver unrivalled performance for our clients on a global scale.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
18	METIA	Exact match	London, United KingdomHQ recorded Sep 26, 2026	201-500	132 contacts →
	Exact match “Metia is a global marketing agency with offices in London, Seattle, Austin and Singapore.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
19	CHS	Exact match	Christchurch, United KingdomHQ recorded Sep 26, 2026	51-200	129 contacts →
	Exact match “We connect brands with customers.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
20	E Intelligence	Exact match	London, United KingdomHQ recorded Sep 26, 2026	51-200	117 contacts →
	Exact match “e intelligence is a renowned global leader in the digital marketing space.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
21	The Media Image	Exact match	London, United KingdomHQ recorded Sep 26, 2026	51-200	108 contacts →
	Exact match “TMI is an independent global performance marketing agency built for complexity, scale, and growth.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
22	FOUND	Exact match	London, United KingdomHQ recorded Sep 26, 2026	51-200	104 contacts →
	Exact match “We're Found, the Everysearch™ agency.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
23	Infoserve	Exact match	Leeds, United KingdomHQ recorded Sep 26, 2026	51-200	103 contacts →
	Exact match “Let’s face it, the world has become an increasingly digital place.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
24	The SEO Works	Exact match	Sheffield, United KingdomHQ recorded Sep 26, 2026	51-200	98 contacts →
	Exact match “The SEO Works are an award-winning provider of search marketing, websites and paid social for leading brands and prospering SME’s.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
25	Finixio	Exact match	London, United KingdomHQ recorded Sep 26, 2026	51-200	96 contacts →
	Exact match “Finixio is UK based remote first Marketing & SEO Agency helping clients all over the world.” Recorded in the RevenueBase company graph · Sep 26, 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 “internet 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 9,966 internet advertising agencies based in the United Kingdom

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Internet advertising agencies based in the United Kingdom at a glance

As of Sep 26, 2026

23.3%Verified-email coverage

6.4%Mobile-number coverage

6.4Average contacts per company

1-10Median size (employees)

31.3%Largest-city concentration · London

Sep 26, 2026Page data refreshed

Companies by employee count

1-10

7,399

11-50

2,162

51-200

300

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 28.0d

9,9340–30

4,66031–60

26261–90

1790–180

89180+

Company record updated

Median 92.0d

00–30

7,00431–60

22,34561–90

30,92190–180

3,964180+

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 the United Kingdom whose business descriptions match “internet 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 14,962 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 September 26, 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.

Internet advertising agencies by metro

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

How many internet advertising agencies are there based in the United Kingdom?

RevenueBase identified 9,966 company matches for internet advertising agencies associated with the United Kingdom as of September 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?

Iprospect tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most internet advertising agencies?

London leads with 3119 company records, followed by Manchester (397) and Birmingham (247).

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 14,962 professional contacts with verified work emails tracked across these 9,966 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 September 26, 2026.

Ready to reach these companies? Verified emails and direct dials for all 9,966 internet advertising agencies based in the United Kingdom. Start with a free account, no credit card.

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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.