Company lists · Data refreshed September 2026

Top 25 Marketplace advertising agencies based in the United Kingdom

Name: Marketplace 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 28, 2026 385 companies tracked

RevenueBase identified 385 marketplace advertising agencies headquartered in the United Kingdom as of September 2026 and tracks 2,754 professional contacts across them, including 914 with verified work emails. London is the largest hub.

This list covers marketplace 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. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 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 28, 2026 86% judged on-target in blind review

385Companies

2,754Contacts tracked

914Verified emails

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The 25 largest marketplace advertising agencies based in the United Kingdom

Ranked by team size

Top 25 of 385 marketplace advertising agencies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to marketplace advertising agencies: 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	Newbase	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	501-1,000	282 contacts →
	Partial evidence “At NewBase we provide expert and independent marketing and advertising services across all media channels globally.” Source: RevenueBase Database · checked Sep 28, 2026
2	ONE Agency Media	Indirect evidence	Manchester, United KingdomHQ checked Sep 28, 2026	11-50	75 contacts →
	Indirect evidence “One Agency: Creating, Delivering and Connecting brands.” Source: RevenueBase Database · checked Sep 28, 2026
3	Spaceandpeople PLC	Indirect evidence	Glasgow, United KingdomHQ checked Sep 28, 2026	51-200	68 contacts →
	Indirect evidence “SpaceandPeople PLC is the leading destination media agency.” Source: RevenueBase Database · checked Sep 28, 2026
4	m3.agency	Partial evidence	Birmingham, United KingdomHQ checked Sep 28, 2026	51-200	55 contacts →
	Partial evidence “M3 are a full service advertising & marketing agency, which offers creative, brand development, media planning, web development and digital marketing services.” Source: RevenueBase Database · checked Sep 28, 2026
5	OCM Digital Media	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	54 contacts →
	Partial evidence “OCM is a leading adtech agency providing solutions to advertisers, advertising agencies and to web, mobile & video publishers.” Source: RevenueBase Database · checked Sep 28, 2026
6	AMS Media Group	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	50 contacts →
	Indirect 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 28, 2026
7	Media Agency Group	Partial evidence	Salford, United KingdomHQ checked Sep 28, 2026	51-200	48 contacts →
	Partial evidence “Media Agency Group is an advertising agency specialising in the purchasing and planning of all media formats across the spectrum of advertising.” Source: RevenueBase Database · checked Sep 28, 2026
8	Universal Television & Media LTD	Partial evidence	Luton, United KingdomHQ checked Sep 28, 2026	51-200	48 contacts →
	Partial evidence “TV ADVERTISING, TV COMMERCIALS, VIDEO & CONTENT PRODUCTION, ADVERTISING, SOCIAL MEDIA MARKETING AND BRAND CONSULTING FOR THE MOST AMBITIOUS BRANDS, BUSINESSES AND STARTUPS ON THE…” Source: RevenueBase Database · checked Sep 28, 2026
9	Astus Group	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
10	BAMBU	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	n/a	45 contacts →
	Partial 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 28, 2026
11	Dianomi	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	40 contacts →
	Partial evidence “Dianomi™ is the leader in premium native advertising for the financial services, technology, corporate and lifestyle sectors.” Source: RevenueBase Database · checked Sep 28, 2026
12	Sembot	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	39 contacts →
	Indirect evidence “Focus on strategy, not manually time-consuming tasks.” Source: RevenueBase Database · checked Sep 28, 2026
13	Automated Creative	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	38 contacts →
	Indirect evidence “Our platform helps performance marketers scale social, display and retail media campaigns.” Source: RevenueBase Database · checked Sep 28, 2026
14	CNS Media LTD	Indirect evidence	Chesterfield, United KingdomHQ checked Sep 28, 2026	11-50	38 contacts →
	Indirect evidence “CNS Media is an independent, award-winning, full-service marketing agency, combining exceptional media buying power with digital and creative expertise.” Source: RevenueBase Database · checked Sep 28, 2026
15	Alliance Advertising And Marketing	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	36 contacts →
	Indirect evidence “We are a dynamic group of multilingual professionals.” Source: RevenueBase Database · checked Sep 28, 2026
16	Mirabelle Communications LTD	Partial evidence	Croydon, United KingdomHQ checked Sep 28, 2026	11-50	28 contacts →
	Partial evidence “Established in 1992 Mirabelle is a London based full service international marketing and advertising agency.” Source: RevenueBase Database · checked Sep 28, 2026
17	December19 B Corp	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	27 contacts →
	Indirect evidence “December19 is a media planning and buying agency.” Source: RevenueBase Database · checked Sep 28, 2026
18	PAB Studios	Partial evidence	Wakefield, United KingdomHQ checked Sep 28, 2026	11-50	27 contacts →
	Partial evidence “PAB Studios have 30 years experience working in advertising/marketing and cover a variety of disciplines including: press/radio/digital advertising, as well as TV advertising…” Source: RevenueBase Database · checked Sep 28, 2026
19	Radio Experts	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	24 contacts →
	Partial evidence “We are leading experts in planning, booking and buying radio advertising on all analogue, digital and On Demand platforms.” Source: RevenueBase Database · checked Sep 28, 2026
20	Smithfield Agency	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	24 contacts →
	Indirect evidence “Where people and creativity drive real results.” Source: RevenueBase Database · checked Sep 28, 2026
21	Pimento	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	23 contacts →
	Indirect evidence “Pimento is a community of agencies, offering a gateway to the independent sector, helping brands to grow by navigating the world of marketing with clear, expert guidance.” Source: RevenueBase Database · checked Sep 28, 2026
22	JWE Media	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	23 contacts →
	Partial evidence “At JWE Media, we take care of your marketing and advertising needs, from TV to Press, Out of Home to Digital, we manage the whole process ensuring we save you time and money.” Source: RevenueBase Database · checked Sep 28, 2026
23	MFM	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	23 contacts →
	Partial evidence “Media Futures Market (MFM) is a high-growth, independent media agency and marketplace.” Source: RevenueBase Database · checked Sep 28, 2026
24	The GO Network	Indirect evidence	Manchester, United KingdomHQ checked Sep 28, 2026	11-50	22 contacts →
	Indirect evidence “Eight years in and matches later, the part that still matters is watching what the right brand and the right agency build together.” Source: RevenueBase Database · checked Sep 28, 2026
25	ONE DAY Agency	Partial evidence	Manchester, United KingdomHQ checked Sep 28, 2026	11-50	21 contacts →
	Partial evidence “One Day Agency is an independent integrated advertising and marketing agency headquartered in Manchester, UK, with offices in London, Warsaw, Paris, and Berlin.” Source: RevenueBase Database · checked Sep 28, 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: marketplace advertising agencies. 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 marketplace advertising agencies.
Partial evidence: Its own public description names part of marketplace advertising agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name marketplace advertising agencies. 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 385 marketplace advertising agencies based in the United Kingdom

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Marketplace advertising agencies based in the United Kingdom at a glance

As of Sep 28, 2026

33.2%Verified-email coverage

7.2Average contacts per company

1-10Median size (employees)

41.0%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

250

11-50

110

51-200

501-1,000

10001+

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 385 companies.

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 marketplace advertising agencies, 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 the United Kingdom whose own description of what they do matches “marketplace advertising agencies”. 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 marketplace advertising agencies), 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 marketplace advertising agencies, 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 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, 914 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 28, 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.

Marketplace advertising agencies by metro

Marketplace advertising agencies in London158

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 marketplace advertising agencies, 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 marketplace advertising agencies are there based in the United Kingdom?

RevenueBase identified 385 marketplace advertising agencies 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?

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

Which city has the most marketplace advertising agencies?

London leads with 158 headquartered companies, followed by Manchester (18) and Birmingham (9).

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 914 verified decision-maker contacts tracked across these 385 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 28, 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.