Company lists · Data refreshed September 2026

Top 25 Paid media agencies for B2B based in London, United Kingdom

Name: Paid media agencies for B2B based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 13, 2026 635 companies tracked

RevenueBase identified 635 paid media agencies for B2B headquartered in London, United Kingdom as of September 2026 and tracks 11,976 professional contacts across them, including 2,436 with verified work emails and 946 with mobile numbers. London is the largest hub.

This list covers paid media agencies for B2B headquartered in London, 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 13, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 RevenueBase Smart Search rating on every row Refreshed Sep 13, 2026 86% judged on-target in blind review

635Companies

11,976Contacts tracked

2,436Verified emails

946Mobile numbers

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The 25 largest paid media agencies for B2B based in London, United Kingdom

Ranked by team size

Top 25 of 635 paid media agencies for B2B based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 13, 2026. RevenueBase Smart Search rates how each company's information relates to paid media agencies for B2B: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	MG OMD	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	201-500	527 contacts →
	Partial evidence “MG OMD, part of Omnicom Media, brings innovation, insight and creativity to the world of media.” Source: RevenueBase Database · checked Sep 13, 2026
2	M C Saatchi Performance	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	201-500	457 contacts →
	Partial evidence “We are a Global digital media agency specializing in taking a human approach to connecting brands with people across all channels.” Source: RevenueBase Database · checked Sep 13, 2026
3	The7stars	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	201-500	295 contacts →
	Partial evidence “the7stars is the UK’s largest independent media agency, offering the best people, the best service and the best creative media campaigns.” Source: RevenueBase Database · checked Sep 13, 2026
4	Medialab Group	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	195 contacts →
	Partial evidence “Medialab is the UK’s leading independent media agency, Campaign's 2025 & 2024 Independent Media Agency of the Year and Media Week's Independent Media Agency of the Year 2025…” Source: RevenueBase Database · checked Sep 13, 2026
5	ALL Response Media	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	178 contacts →
	Partial evidence “All Response Media is the leading performance media planning and buying agency.” Source: RevenueBase Database · checked Sep 13, 2026
6	Expandi Group	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	201-500	155 contacts →
	Indirect evidence “Expandi Group is a global leader in AdTech, MarTech and Managed Services.” Source: RevenueBase Database · checked Sep 13, 2026
7	Publicis PRO	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	139 contacts →
	Partial evidence “Publicis Pro is the specialist B2B marketing agency within Publicis Groupe, the world's number one marketing holding group.” Source: RevenueBase Database · checked Sep 13, 2026
8	The Kite Factory	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	111 contacts →
	Partial evidence “We’re The Kite Factory, the independent media agency built on Values and Velocity.” Source: RevenueBase Database · checked Sep 13, 2026
9	Internal Results	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	201-500	88 contacts →
	Partial evidence “The B2B Customer Acquisition Specialists Internal Results specialize in generating leads, promoting content, and driving brand awareness for B2B organizations worldwide through…” Source: RevenueBase Database · checked Sep 13, 2026
10	The Media People	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	83 contacts →
	Indirect evidence “Powered by our people, our campaigns put your audience first.” Source: RevenueBase Database · checked Sep 13, 2026
11	Fight OR Flight	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	67 contacts →
	Partial evidence “Today, B2B brands battle for attention in the same crowded space as everything else.” Source: RevenueBase Database · checked Sep 13, 2026
12	Clicksco	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	66 contacts →
	Indirect evidence “As a new chapter in our Digital Agency begins, we are also a fantastic place to work, with a reputation for discovering and nurturing some of the finest minds in the business…” Source: RevenueBase Database · checked Sep 13, 2026
13	MJ Media	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	57 contacts →
	Partial evidence “MJ Media are a fully independent media planning & buying agency.” Source: RevenueBase Database · checked Sep 13, 2026
14	OCM Digital Media	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	54 contacts →
	Indirect evidence “OCM is a leading adtech agency providing solutions to advertisers, advertising agencies and to web, mobile & video publishers.” Source: RevenueBase Database · checked Sep 13, 2026
15	Adgenda Media International	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	51 contacts →
	Partial evidence “Adgenda Media International (AMI) was established in 2005 as an independent, strategic results-driven media agency.” Source: RevenueBase Database · checked Sep 13, 2026
16	The Marketing Practice	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	501-1,000	51 contacts →
	Partial evidence “At The Marketing Practice, we’ve combined the best B2B specialists from across the globe in one business, with capabilities that stretch through the funnel, from brand to demand…” Source: RevenueBase Database · checked Sep 13, 2026
17	AMS Media Group	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	50 contacts →
	Partial evidence “From our office in London & Leeds, we seamlessly plan and buy media across all channels: digital, TV, cinema, OOH, radio, print, social and search.” Source: RevenueBase Database · checked Sep 13, 2026
18	Stellar Search	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	48 contacts →
	Partial evidence “We're a strategic digital marketing agency specialising in Paid Search, SEO, Google Shopping, Amazon and Social.” Source: RevenueBase Database · checked Sep 13, 2026
19	Harvest Digital	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	48 contacts →
	Partial evidence “We are a leading independent digital media agency.” Source: RevenueBase Database · checked Sep 13, 2026
20	Astus Group	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	47 contacts →
	Indirect evidence “We speak to Marketing Directors across all sectors all the time and we understand their challenges and board demands: Get More ROI.” Source: RevenueBase Database · checked Sep 13, 2026
21	BAMBU	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	n/a	45 contacts →
	Indirect evidence “Bambu is an online marketing and advertising agency based in London, working with startup and growth brands across the UK, Europe and North America, founded by two ex-WPP…” Source: RevenueBase Database · checked Sep 13, 2026
22	The Think Tank	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	44 contacts →
	Indirect evidence “We are The Think Tank: a fully-integrated, result-oriented agency based in Holborn, London.” Source: RevenueBase Database · checked Sep 13, 2026
23	The Grove Media B Corp	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	44 contacts →
	Partial evidence “As an independent media agency we think differently.” Source: RevenueBase Database · checked Sep 13, 2026
24	Kinase	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	39 contacts →
	Indirect evidence “Kinase is a leading Digital Marketing Agency providing services to some of the UK’s top companies.” Source: RevenueBase Database · checked Sep 13, 2026
25	TRUE	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	38 contacts →
	Strong evidence “True is a B2B specialist creative and media agency based in London with global offices.” Source: RevenueBase Database · checked Sep 13, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: paid media agencies for B2B. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names paid media agencies for B2B.
Partial evidence: Its own public description names part of paid media agencies for B2B, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name paid media agencies for B2B. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 635 paid media agencies for B2B based in London, United Kingdom

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Paid media agencies for B2B based in London, United Kingdom at a glance

As of Sep 13, 2026

20.3%Verified-email coverage

7.9%Mobile-number coverage

18.9Average contacts per company

1-10Median size (employees)

75.3%Largest-city concentration · London

Sep 13, 2026Page data refreshed

Companies by employee count

1-10

386

11-50

199

51-200

201-500

501-1,000

Freshness & accuracy

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

Email last verified

Median 15.0d

1,9350–30

48531–60

761–90

090–180

9180+

Company record updated

Median 77.0d

00–30

4,21831–60

5,84661–90

1,36890–180

544180+

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 paid media agencies for B2B, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search 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 Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in London, United Kingdom whose own description of what they do matches “paid media agencies for B2B”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names paid media agencies for B2B), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among paid media agencies for B2B, and records with no verified work email. Companies headquartered outside London 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 its RevenueBase Smart Search 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, 2,436 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 13, 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.

Paid media agencies for B2B by metro in the United Kingdom

Paid media agencies for B2B in London478
Paid media agencies for B2B in Manchester89
Paid media agencies for B2B in Birmingham31
Paid media agencies for B2B in Leeds25

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names paid media agencies for B2B, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many paid media agencies for B2B are there based in London, United Kingdom?

RevenueBase identified 635 paid media agencies for B2B headquartered in London, 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?

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

Which city has the most paid media agencies for B2B?

London leads with 478 headquartered companies, followed by Manchester (89) and Birmingham (31).

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 2,436 verified decision-maker contacts tracked across these 635 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 13, 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 Smart Search, 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.