Company lists · Data refreshed September 2026

Top 25 Outsource business development companies based in London, United Kingdom

Name: Outsource business development companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 434 companies tracked

RevenueBase identified 434 outsource business development companies headquartered in London, United Kingdom as of September 2026 and tracks 3,123 professional contacts across them, including 410 with verified work emails. London is the largest hub.

This list covers outsource business development companies 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 21, 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 21, 2026 86% judged on-target in blind review

434Companies

3,123Contacts tracked

410Verified emails

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The 25 largest outsource business development companies based in London, United Kingdom

Ranked by team size

Top 25 of 434 outsource business development companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to outsource business development companies: 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	Engagetech	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	205 contacts →
	Partial evidence “EngageTech is the leading sales development partner for complex B2B technology companies operating in multi-stakeholder, enterprise sales environments.” Source: RevenueBase Database · checked Sep 21, 2026
2	The Point Company	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	160 contacts →
	Indirect evidence “We’re The Point Company, the team behind some of the fastest-scaling B2B companies in tech, SaaS and cybersecurity, working across five continents from North America and LATAM to…” Source: RevenueBase Database · checked Sep 21, 2026
3	Internal Results	Indirect evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
4	Salesar	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	59 contacts →
	Indirect evidence “Looking to fill your calendar with qualified calls?” Source: RevenueBase Database · checked Sep 21, 2026
5	Xlr8	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	59 contacts →
	Indirect evidence “Consult us for.” Source: RevenueBase Database · checked Sep 21, 2026
6	Topboffin	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	53 contacts →
	Indirect evidence “Most UK SMEs hit the same two walls.” Source: RevenueBase Database · checked Sep 21, 2026
7	FLY PIE LTD	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	48 contacts →
	Partial 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 21, 2026
8	EI Global B2B Marketing Intelligence	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	42 contacts →
	Indirect evidence “Ei Advisory provides B2B sales and marketing intelligence that helps companies reach, engage and convert customers.” Source: RevenueBase Database · checked Sep 21, 2026
9	Stack Solutions Group	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	39 contacts →
	Indirect evidence “At Stack Solutions Group, we help ambitious brands grow faster, smarter, and more efficiently - across any market.” Source: RevenueBase Database · checked Sep 21, 2026
10	auxilium.digital	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	35 contacts →
	Partial evidence “Auxilium Digital helps businesses with limited resources, higher operational costs achieve utmost customer satisfaction through providing customized offshore development teams…” Source: RevenueBase Database · checked Sep 21, 2026
11	Xcellerate Labs	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	26 contacts →
	Indirect evidence “At Xcellerate Labs, we boost your pipeline and accelerate results in the tech industry.” Source: RevenueBase Database · checked Sep 21, 2026
12	Outbound Partners	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	24 contacts →
	Indirect evidence “Outbound Partners helps B2B companies generate pipeline through structured outbound.” Source: RevenueBase Database · checked Sep 21, 2026
13	RCR Partnership	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	1-10	24 contacts →
	Partial evidence “We help you work out what marketing and business development you should be doing (the strategy) AND how to get it done (the implementation).” Source: RevenueBase Database · checked Sep 21, 2026
14	European Gateway Consulting Group	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	18 contacts →
	Indirect evidence “Global Connections with European Gateway At European Gateway, we are dedicated to connecting technology companies and customers on a global scale.” Source: RevenueBase Database · checked Sep 21, 2026
15	JBI Advertising	Indirect evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
16	Terran Connect	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	1-10	17 contacts →
	Indirect evidence “Terran Connect: Your Growth Partner for Sales, Marketing, and VC Funding At Terran Connect, we help companies achieve their growth objectives through focused execution and…” Source: RevenueBase Database · checked Sep 21, 2026
17	Corextreme Technologies	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	17 contacts →
	Indirect evidence “Are you starting a business and need affordable solutions to help it grow?” Source: RevenueBase Database · checked Sep 21, 2026
18	Adds Corporation	Indirect evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
19	BIG Wolf Marketing	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	16 contacts →
	Indirect 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 21, 2026
20	The Sales Centre	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	1-10	14 contacts →
	Partial evidence “We are an outsourcing agency specializing in sales, marketing, and customer support.” Source: RevenueBase Database · checked Sep 21, 2026
21	salesflow.io	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	13 contacts →
	Indirect evidence “Salesflow is a simple and effective lead-generation platform that enables Sales Teams, Agencies and growing SMBs to generate quality leads fast.” Source: RevenueBase Database · checked Sep 21, 2026
22	Business Hunters	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	13 contacts →
	Indirect evidence “Business Hunters is a strategic B2B enterprise sales consultancy that helps businesses accelerate revenue growth by managing the full sales cycle from prospecting to closing deals.” Source: RevenueBase Database · checked Sep 21, 2026
23	Callent Tech LTD	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	11 contacts →
	Indirect evidence “Welcome to Callent Tech, The Future of B2B Demand Generation.” Source: RevenueBase Database · checked Sep 21, 2026
24	Transaction Focus	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	10 contacts →
	Partial evidence “Transaction Focus is a leading Global outsourced sales and marketing company with headquarters in the United Kingdom with connections and associates based in China,the USA…” Source: RevenueBase Database · checked Sep 21, 2026
25	Momentum Outbound	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	1-10	10 contacts →
	Indirect evidence “Momentum Outbound helps growing SMEs run the operational side of commercial growth.” Source: RevenueBase Database · checked Sep 21, 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: outsource business development companies. 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 outsource business development companies.
Partial evidence: Its own public description names part of outsource business development companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name outsource business development companies. 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 434 outsource business development companies based in London, United Kingdom

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Outsource business development companies based in London, United Kingdom at a glance

As of Sep 21, 2026

13.1%Verified-email coverage

7.2Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

305

11-50

51-200

201-500

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 434 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 outsource business development companies, 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 “outsource business development companies”. 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 outsource business development companies), 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 outsource business development companies, 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, 410 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 21, 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.

Outsource business development companies by metro in the United Kingdom

Outsource business development companies in London434
Outsource business development companies in Manchester59
Outsource business development companies in Birmingham32

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 outsource business development companies, 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 outsource business development companies are there based in London, United Kingdom?

RevenueBase identified 434 outsource business development companies 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?

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

Which city has the most outsource business development companies?

London leads with 434 headquartered companies, followed by Manchester (59) and Birmingham (32).

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 410 verified decision-maker contacts tracked across these 434 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 21, 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.