Company lists · Data refreshed September 2026

Top 25 Outbound marketing service providers based in London, United Kingdom

Name: Outbound marketing service providers based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 448 companies tracked

RevenueBase identified 448 outbound marketing service providers headquartered in London, United Kingdom as of September 2026 and tracks 4,319 professional contacts across them, including 872 with verified work emails. London is the largest hub.

This list covers outbound marketing service providers 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 14, 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 14, 2026 86% judged on-target in blind review

448Companies

4,319Contacts tracked

872Verified emails

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The 25 largest outbound marketing service providers based in London, United Kingdom

Ranked by team size

Top 25 of 448 outbound marketing service providers based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to outbound marketing service providers: 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	Innerworkings	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	1,001-5,000	757 contacts →
	Partial evidence “Founded in 1991, HH Global is a global outsourced marketing execution provider.” Source: RevenueBase Database · checked Sep 14, 2026
2	MVF	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	201-500	401 contacts →
	Indirect evidence “MVF powers growth for our clients by connecting them to potential customers.” Source: RevenueBase Database · checked Sep 14, 2026
3	Incredible Marketeer Ites An ISO 9001 2015 Company	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	201-500	147 contacts →
	Indirect evidence “It ain't over 'til it's over." This quote applies very aptly to the way Incredible Marketeer works and performs.” Source: RevenueBase Database · checked Sep 14, 2026
4	Internal Results	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	201-500	88 contacts →
	Indirect 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 14, 2026
5	Salesar	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	59 contacts →
	Indirect evidence “Looking to fill your calendar with qualified calls?” Source: RevenueBase Database · checked Sep 14, 2026
6	Orbitalx	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	53 contacts →
	Partial evidence “OrbitalX is an account-based marketing agency helping B2B marketing teams generate ICP qualified pipeline.” Source: RevenueBase Database · checked Sep 14, 2026
7	The Marketing Practice	Partial evidence	London, United KingdomHQ checked Sep 14, 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 14, 2026
8	FLY PIE LTD	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	48 contacts →
	Indirect evidence “At Fly Pie, sales outsourcing isn’t a “done-for-you” service, it’s a growth engine we build with you.” Source: RevenueBase Database · checked Sep 14, 2026
9	Miri Growth	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	11-50	44 contacts →
	Partial evidence “Miri is an extension of your creative and marketing teams.” Source: RevenueBase Database · checked Sep 14, 2026
10	The Think Tank	Indirect evidence	London, United KingdomHQ checked Sep 14, 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 14, 2026
11	Velocity Partners	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	32 contacts →
	Partial evidence “B2B marketing has a big pipeline problem.” Source: RevenueBase Database · checked Sep 14, 2026
12	Digiio	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	11-50	28 contacts →
	Indirect evidence “At digiio we pioneer innovative campaigns, approaches and intelligence that unlock interest and capture the imagination of our client’s customers.” Source: RevenueBase Database · checked Sep 14, 2026
13	Local Fame	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	11-50	25 contacts →
	Partial evidence “Local Fame is an internet marketing agency in London established in 2012 by Rune Sovndahl.” Source: RevenueBase Database · checked Sep 14, 2026
14	Hard Numbers	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	11-50	24 contacts →
	Partial evidence “We are the performance-driven marketing and communications consultancy which focuses on delivering tangible, demonstrable return on investment for our clients.” Source: RevenueBase Database · checked Sep 14, 2026
15	Agent3 Group	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	24 contacts →
	Partial evidence “Formed in 2013, the Agent3 Group was an early pioneer of Account-Based Marketing and has spent its first decade helping some of the largest B2B organizations in the world build…” Source: RevenueBase Database · checked Sep 14, 2026
16	Outbound Partners	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	24 contacts →
	Partial evidence “Outbound Partners helps B2B companies generate pipeline through structured outbound.” Source: RevenueBase Database · checked Sep 14, 2026
17	Prospectaware	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	11-50	23 contacts →
	Indirect evidence “ProspectAware are experts at Executive level appointment setting.” Source: RevenueBase Database · checked Sep 14, 2026
18	Bluestripe Group	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	11-50	21 contacts →
	Partial evidence “Founded in 2017 by three TMT industry veterans, Bluestripe Group is a pioneering B2B marketing services business made up of three units which offer integrated PR, content and…” Source: RevenueBase Database · checked Sep 14, 2026
19	Mixology Digital	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	11-50	19 contacts →
	Partial evidence “Mixology Digital (formerly Intentify Demand) is a global B2B demand generation and account-based marketing (ABM) partner built for enterprise growth.” Source: RevenueBase Database · checked Sep 14, 2026
20	Cardell Media	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	11-50	19 contacts →
	Partial evidence “For more than two decades, Cardell Media has been helping growing businesses implement successful online marketing.” Source: RevenueBase Database · checked Sep 14, 2026
21	JBI Advertising	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	1-10	17 contacts →
	Indirect evidence “Our mission is to empower businesses across various sectors, locally and globally, by delivering innovative performance driven lead generation solutions.” Source: RevenueBase Database · checked Sep 14, 2026
22	BIG Wolf Marketing	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	16 contacts →
	Partial evidence “Big Wolf Marketing - Leaders in B2B Telemarketing, Lead Generation & Appointment Setting With a vast combined experience, implementing established and cutting edge innovative…” Source: RevenueBase Database · checked Sep 14, 2026
23	Adds Corporation	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	16 contacts →
	Indirect evidence “ADDS Corporation is a one-stop marketplace for the best B2B Marketers, Agencies, Publishers, and Lead Generation Solution Providers.” Source: RevenueBase Database · checked Sep 14, 2026
24	Kingpin Communications	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	16 contacts →
	Partial evidence “Kingpin is now part of The Marketing Practice The Marketing Practice has combined the best B2B specialists from across the globe in one business, with capabilities that stretch…” Source: RevenueBase Database · checked Sep 14, 2026
25	The Sales Centre	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	1-10	14 contacts →
	Partial evidence “We are an outsourcing agency specializing in sales, marketing, and customer support.” Source: RevenueBase Database · checked Sep 14, 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: outbound marketing service providers. 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 outbound marketing service providers.
Partial evidence: Its own public description names part of outbound marketing service providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name outbound marketing service providers. 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 448 outbound marketing service providers based in London, United Kingdom

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Outbound marketing service providers based in London, United Kingdom at a glance

As of Sep 14, 2026

20.2%Verified-email coverage

9.6Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

306

11-50

104

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 448 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 outbound marketing service providers, 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 “outbound marketing service providers”. 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 outbound marketing service providers), 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 outbound marketing service providers, 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, 872 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 14, 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.

Outbound marketing service providers by metro in the United Kingdom

Outbound marketing service providers in London448
Outbound marketing service providers in Manchester71
Outbound marketing service providers in Birmingham34
Outbound marketing service providers in Leeds28

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 outbound marketing service providers, 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 outbound marketing service providers are there based in London, United Kingdom?

RevenueBase identified 448 outbound marketing service providers 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?

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

Which city has the most outbound marketing service providers?

London leads with 448 headquartered companies, followed by Manchester (71) and Birmingham (34).

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 872 verified decision-maker contacts tracked across these 448 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 14, 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.