Company lists · Data refreshed November 2026

Top 25 Advertising effectiveness agencies based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 131 companies tracked

RevenueBase identified 131 company matches for advertising effectiveness agencies associated with the United Kingdom as of November 2026 and tracks 2,413 professional contacts across them, including 762 with verified work emails. London is the largest hub.

This list covers company matches for advertising effectiveness 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 November 6, 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 Nov 6, 2026 How this list was built

131Companies

2,413Contacts tracked

762Verified emails

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The 25 largest advertising effectiveness agencies based in the United Kingdom

Ranked by team size

Top 25 of 131 company matches for advertising effectiveness agencies based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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	Kantar Media	Exact match	London, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	1,171 contacts →
	Exact match “Kantar Media is now Fifty5Blue.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Cogent	Exact match	Leamington Spa, United KingdomHQ recorded Nov 6, 2026	51-200	138 contacts →
	Exact match “If nobody notices your advertising, is it even advertising?” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Goodstuff	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	128 contacts →
	Exact match “We are an award-winning media planning and buying agency, helping brands cut through the noise with strategic clarity, inventive solutions, and commercial integrity.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	SEAL	Exact match	Slade Heath, United KingdomHQ recorded Nov 6, 2026	11-50	100 contacts →
	Exact match “We specialise in results-driven marketing.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	ONE Agency Media	Exact match	Manchester, United KingdomHQ recorded Nov 6, 2026	11-50	75 contacts →
	Exact match “One Agency: Creating, Delivering and Connecting brands.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	On Device	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	63 contacts →
	Exact match “On Device provides independent Brand Lift measurement to advertisers, planners and publishers.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	COAL	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	59 contacts →
	Exact match “At COAL we make better advertising, by making advertising better.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Cream B Corp	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	34 contacts →
	Exact match “Cream is a creative & media agency, delivering stronger advertising returns through distinctiveness.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	December19 B Corp	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	31 contacts →
	Exact match “December19 is The Bigger Question Agency - an independent, B Corp certified media agency helping challenger brands out-think bigger competitors through media strategy, planning…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Mostly Media	Exact match	Bath, United KingdomHQ recorded Nov 6, 2026	11-50	23 contacts →
	Exact match “Mostly Media is an independent media buying agency based in Bath.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Smithfield Agency	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	23 contacts →
	Exact match “Where people and creativity drive real results.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	Wordley Creative	Exact match	Penarth, United KingdomHQ recorded Nov 6, 2026	11-50	19 contacts →
	Exact match “Creative that thinks big and delivers results fast, for less.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Fraggell	Exact match	Denton, United KingdomHQ recorded Nov 6, 2026	11-50	17 contacts →
	Exact match “We lower brands CPAs and improve CTR with ad creative that’s built from the ground up with data and diversity in mind” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	CME Media	Exact match	Uk Wide, United KingdomHQ recorded Nov 6, 2026	1-10	17 contacts →
	Exact match “CMe Media Ltd is an advertising and marketing agency with a significant level of experience within the UK media industry.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Brazil Street LTD	Exact match	Stockport, United KingdomHQ recorded Nov 6, 2026	11-50	17 contacts →
	Exact match “Those great advertising campaigns you see in just the right place at just the right time?” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Auditstar	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	15 contacts →
	Exact match “AuditStar is a marketing solutions and media auditing consultancy with global reach.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Viewerslogic	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	14 contacts →
	Exact match “ViewersLogic boosts your chances of hitting your business targets.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Allied Media	Exact match	Southwark, United KingdomHQ recorded Nov 6, 2026	1-10	14 contacts →
	Exact match “Operating across all elements of the media mix, offline and online to produce campaigns for both brand building and direct response.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	The Effectiveness Partnership	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	13 contacts →
	Exact match “The Effectiveness Partnership (TEP) helps brands and agencies embed a culture of effectiveness, design effective strategies, align on more effective ways of working, and oversee…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	CRKLR	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	13 contacts →
	Exact match “CRKLR is a new breed of agency.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	The Slice	Exact match	Redhill, United KingdomHQ recorded Nov 6, 2026	11-50	13 contacts →
	Exact match “The Slice Ltd originally started as a media independent in 1993, moving from National Press to Radio, Television and finally Online.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	Excite OOH	Exact match	London, United KingdomHQ recorded Nov 6, 2026	1-10	12 contacts →
	Exact match “Excite OOH is a specialised outdoor advertising agency covering all aspects of media planning, buying, creative, reporting, strategy, etc.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	Independent Marketing Sciences	Exact match	London, United KingdomHQ recorded Nov 6, 2026	1-10	11 contacts →
	Exact match “As a global marketing effectiveness consultancy, we partner with CMOs and marketing teams to discover the insights from data to enable them to make better decisions to drive…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Hello Yellow	Exact match	London, United KingdomHQ recorded Nov 6, 2026	1-10	11 contacts →
	Exact match “What is the maximum value a single individual can provide to a clients business?' That's the single question we're building our entire proposition around.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	Global TV Experts	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	10 contacts →
	Exact match “Global TV Experts is a Game-Changing TV advertising agency.” Recorded in the RevenueBase company graph · Nov 6, 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 “advertising effectiveness 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 131 advertising effectiveness agencies based in the United Kingdom

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Advertising effectiveness agencies based in the United Kingdom at a glance

As of Nov 6, 2026

31.6%Verified-email coverage

18.4Average contacts per company

1-10Median size (employees)

44.3%Largest-city concentration · London

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

1,001-5,000

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 131 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 the United Kingdom whose business descriptions match “advertising effectiveness 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 762 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 November 6, 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.

Advertising effectiveness agencies by metro

Advertising effectiveness agencies in London58

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

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

RevenueBase identified 131 company matches for advertising effectiveness agencies associated with the United Kingdom as of November 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?

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

Which city has the most advertising effectiveness agencies?

London leads with 58 company records, followed by Manchester (6) and Birmingham (5).

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 762 professional contacts with verified work emails tracked across these 131 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 November 6, 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.