Company lists · Data refreshed September 2026

Top 25 Outsourced businesses based in London, United Kingdom

Name: Outsourced businesses 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 465 companies tracked

RevenueBase identified 465 outsourced businesses headquartered in London, United Kingdom as of September 2026 and tracks 26,469 professional contacts across them, including 5,687 with verified work emails. London is the largest hub.

This list covers outsourced businesses 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

465Companies

26,469Contacts tracked

5,687Verified emails

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The 25 largest outsourced businesses based in London, United Kingdom

Ranked by team size

Top 25 of 465 outsourced businesses 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 outsourced businesses: 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	Capita	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	10001+	20,824 contacts →
	Strong evidence “Capita is an outsourcer, helping clients across the public and private sectors run complex business processes more efficiently, creating better consumer experiences.” Source: RevenueBase Database · checked Sep 21, 2026
2	Vertex Data Science	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	569 contacts →
	Strong evidence “Vertex is a leader in BPO and Customer Management Outsourcing, serving over 200 clients worldwide across many sectors.” Source: RevenueBase Database · checked Sep 21, 2026
3	Sensée	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	1,001-5,000	406 contacts →
	Indirect evidence “In 2004, Sensée was founded on a simple principle: bring work to people, not people to work.” Source: RevenueBase Database · checked Sep 21, 2026
4	Ubique Systems	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	333 contacts →
	Strong evidence “Ubique Systems is a fast growing multifaceted organization which offers a comprehensive array of outsourcing and consulting services for its customers, including recruitment…” Source: RevenueBase Database · checked Sep 21, 2026
5	GI Outsourcing	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	311 contacts →
	Strong evidence “GI Outsourcing is a UK-based accountants outsourcing firm.” Source: RevenueBase Database · checked Sep 21, 2026
6	Potentiam LTD	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	150 contacts →
	Indirect evidence “At Potentiam, we help businesses unlock growth by building nearshore and offshore teams that empower organisations to scale faster, operate smarter and stay ahead of the…” Source: RevenueBase Database · checked Sep 21, 2026
7	Initor Global UK	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	108 contacts →
	Indirect evidence “As attention turns to the new fiscal year, accountants across the UK are finalising plans to boost growth and productivity and improve profitability.” Source: RevenueBase Database · checked Sep 21, 2026
8	Youpro Contact	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	90 contacts →
	Strong evidence “A world class offshore outsourcing agency, with offices in London and Harare, we have access to some of the best educated, best spoken graduates you will find anywhere in the…” Source: RevenueBase Database · checked Sep 21, 2026
9	Outsourcery	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	84 contacts →
	Indirect evidence “UK businesses are under pressure- Hiring is slower- Costs are rising- And internal teams are stretched thin.” Source: RevenueBase Database · checked Sep 21, 2026
10	Invedus Outsourcing	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	70 contacts →
	Strong evidence “Invedus Outsourcing is a remote employees outsourcing company.” Source: RevenueBase Database · checked Sep 21, 2026
11	Xanadutec	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	70 contacts →
	Strong evidence “We are a 400 member strong, specialist business process outsourcing (BPO) provider that caters to the diverse and complex information processing needs of todays corporation.” Source: RevenueBase Database · checked Sep 21, 2026
12	Qormotho	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	66 contacts →
	Strong evidence “QORMOTHO is a global outsourcing company.” Source: RevenueBase Database · checked Sep 21, 2026
13	Support Adventure	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	62 contacts →
	Strong evidence “Support Adventure is an outsourcing company that specializes in customer service and support.” Source: RevenueBase Database · checked Sep 21, 2026
14	Stellaripe	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	58 contacts →
	Indirect evidence “We are on a mission to help accountants to grow their accountancy practice and become more profitable.” Source: RevenueBase Database · checked Sep 21, 2026
15	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
16	FLY PIE LTD	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	48 contacts →
	Strong 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
17	Direct Response	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	46 contacts →
	Strong evidence “Direct Response can provide outsourcing of voice, data and contact centre services for organisation from a global business to a one-man operation, delivering outstanding service…” Source: RevenueBase Database · checked Sep 21, 2026
18	Factotum	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	41 contacts →
	Indirect evidence “Welcome to Factotum-your secret weapon for streamlined business success!” Source: RevenueBase Database · checked Sep 21, 2026
19	IVY Tech	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	35 contacts →
	Strong evidence “We are reinventing how startups grow their software development teams by bridging the gap between outsourcing and in-house hiring.” Source: RevenueBase Database · checked Sep 21, 2026
20	auxilium.digital	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	35 contacts →
	Indirect 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
21	Oakford Advisors LTD	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	24 contacts →
	Strong evidence “Oakford Advisors Ltd, a Centralis Group company, is an outsourced business services firm which specialises in providing back-office support to start-up or existing companies…” Source: RevenueBase Database · checked Sep 21, 2026
22	Sparemytime	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	1-10	24 contacts →
	Indirect evidence “sparemytime is the operating partner that growth-minded businesses turn to when they're growing faster than the systems behind them.” Source: RevenueBase Database · checked Sep 21, 2026
23	The Knowledge Group	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	1-10	23 contacts →
	Strong evidence “At tkg, we empower organisations to outsource better.” Source: RevenueBase Database · checked Sep 21, 2026
24	Abacus Resource Solutions	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	20 contacts →
	Indirect evidence “As a leadership team with more than 45 years’ combined experience, our mission is to enable businesses to focus on growth and profitability by offering bespoke Finance, Accounting…” Source: RevenueBase Database · checked Sep 21, 2026
25	Samran Technologies LTD	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	20 contacts →
	Indirect evidence “Samran Technologies provide IT services and set up offshore development and support centers for clients in areas like eLearning, eCommerce, job portals, magazines, etc.” 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: outsourced businesses. 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 outsourced businesses.
Partial evidence: Its own public description names part of outsourced businesses, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name outsourced businesses. 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 465 outsourced businesses based in London, United Kingdom

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Outsourced businesses based in London, United Kingdom at a glance

As of Sep 21, 2026

21.5%Verified-email coverage

56.9Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

237

11-50

136

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 465 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 outsourced businesses, 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 “outsourced businesses”. 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 outsourced businesses), 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 outsourced businesses, 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, 5,687 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.

Outsourced businesses by metro in the United Kingdom

Outsourced businesses in London465
Outsourced businesses in Manchester49
Outsourced businesses in Birmingham25

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 outsourced businesses, 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 outsourced businesses are there based in London, United Kingdom?

RevenueBase identified 465 outsourced businesses 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?

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

Which city has the most outsourced businesses?

London leads with 465 headquartered companies, followed by Manchester (49) and Birmingham (25).

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 5,687 verified decision-maker contacts tracked across these 465 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.