Company lists · Data refreshed September 2026

Top 25 IT outsourcing services based in London, United Kingdom

Name: IT outsourcing services based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 658 companies tracked

RevenueBase identified 658 IT outsourcing services headquartered in London, United Kingdom as of September 2026 and tracks 30,640 professional contacts across them, including 6,582 with verified work emails. London is the largest hub.

This list covers IT outsourcing services 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 27, 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 27, 2026 86% judged on-target in blind review

658Companies

30,640Contacts tracked

6,582Verified emails

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The 25 largest IT outsourcing services based in London, United Kingdom

Ranked by team size

Top 25 of 658 IT outsourcing services based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to IT outsourcing services: 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	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	10001+	20,824 contacts →
	Indirect 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 27, 2026
2	Genisys Group	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	1,001-5,000	1,178 contacts →
	Indirect evidence “Genisys Group is a new age global information technology and business process services company.” Source: RevenueBase Database · checked Sep 27, 2026
3	NSC Global	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	1,001-5,000	1,039 contacts →
	Indirect evidence “Global business doesn’t have to be complicated.” Source: RevenueBase Database · checked Sep 27, 2026
4	Excis Compliance	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	1,001-5,000	616 contacts →
	Partial evidence “Excis is a trusted global IT services company, delivering agile, multilingual support across 150+ countries.” Source: RevenueBase Database · checked Sep 27, 2026
5	Ubique Systems	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	501-1,000	333 contacts →
	Partial 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 27, 2026
6	Damco Solutions Limited	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	1,001-5,000	327 contacts →
	Partial evidence “Damco Solutions Limited is a specialist software solutions and services & a business process outsourcing services company.” Source: RevenueBase Database · checked Sep 27, 2026
7	Axiom Software Solutions Limited	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	201-500	114 contacts →
	Partial evidence “Axiom is a global information technology, consulting and outsourcing company and services provider.” Source: RevenueBase Database · checked Sep 27, 2026
8	Xynotech	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	96 contacts →
	Partial evidence “Xynotech is a provider of IT consulting and software development services that help companies overtake their competition.” Source: RevenueBase Database · checked Sep 27, 2026
9	Matsco Solutions	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	96 contacts →
	Partial evidence “Matsco Solutions is a global managed IT service provider built exclusively for the financial services industry.” Source: RevenueBase Database · checked Sep 27, 2026
10	Bluesource	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	92 contacts →
	Indirect evidence “The costs for shifting to the cloud and juggling a hybrid environment continue to escalate due to rising support fees and expensive tech resources.” Source: RevenueBase Database · checked Sep 27, 2026
11	SAT Microsystems	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	84 contacts →
	Partial evidence “SAT Microsystems is a proven IT Service Provider leader in developing innovative solutions that reduce business costs and complexity in Saudi Arabia, UAE, and 8 other countries.” Source: RevenueBase Database · checked Sep 27, 2026
12	9nexus	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	82 contacts →
	Partial evidence “Welcome to 9NEXUS- Your Trusted Partner for IT Staff Augmentation & Offshore Solutions.” Source: RevenueBase Database · checked Sep 27, 2026
13	Hybytes	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	201-500	79 contacts →
	Partial evidence “Hybytes is an offshore/domestic solution provider for IT and Management to business and industry.” Source: RevenueBase Database · checked Sep 27, 2026
14	Xanadutec	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	201-500	70 contacts →
	Partial 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 27, 2026
15	Qormotho	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	66 contacts →
	Partial evidence “QORMOTHO is a global outsourcing company.” Source: RevenueBase Database · checked Sep 27, 2026
16	Anya Consultancy Services	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	63 contacts →
	Partial evidence “ACS is a fast-emerging IT service provider focuses on providing quality, innovative, cost effective IT support services.” Source: RevenueBase Database · checked Sep 27, 2026
17	Support Adventure	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	62 contacts →
	Partial evidence “Support Adventure is an outsourcing company that specializes in customer service and support.” Source: RevenueBase Database · checked Sep 27, 2026
18	Devbox	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	52 contacts →
	Indirect evidence “Devbox Technologies is a UK based company that specializes in providing services related to the development, testing, maintenance, and enhancement of software applications for…” Source: RevenueBase Database · checked Sep 27, 2026
19	Insight International UK LTD	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	50 contacts →
	Partial evidence “We provide Software Development, Maintenance and Other Related IT Services, across spectrum, depending on individual client’s needs and dependability on us.” Source: RevenueBase Database · checked Sep 27, 2026
20	SKO Systems	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	45 contacts →
	Indirect evidence “At SKO Systems, we engineer enterprise-grade software ecosystems designed for the unique, high-stakes realities of the maritime environment.” Source: RevenueBase Database · checked Sep 27, 2026
21	Thinq24	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	11-50	42 contacts →
	Indirect evidence “Software Development Company that encourages thinking beyond limits, turning our customers' ideas into reality.” Source: RevenueBase Database · checked Sep 27, 2026
22	Factotum	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	41 contacts →
	Indirect evidence “Welcome to Factotum-your secret weapon for streamlined business success!” Source: RevenueBase Database · checked Sep 27, 2026
23	Fifosys	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	40 contacts →
	Indirect evidence “Based in London, Fifosys is a vendor-independent, technology infrastructure development and outsourced managed services provider.” Source: RevenueBase Database · checked Sep 27, 2026
24	Phoenix47	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	40 contacts →
	Partial evidence “Phoenix47 is an IT infrastructure services company providing Support Desk, Managed Services and Professional Services.” Source: RevenueBase Database · checked Sep 27, 2026
25	Mifort	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	39 contacts →
	Partial evidence “We are a software development outsourcing company with 9+ years in business and 200+ successful projects.” Source: RevenueBase Database · checked Sep 27, 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: IT outsourcing services. 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 IT outsourcing services.
Partial evidence: Its own public description names part of IT outsourcing services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name IT outsourcing services. 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 658 IT outsourcing services based in London, United Kingdom

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IT outsourcing services based in London, United Kingdom at a glance

As of Sep 27, 2026

21.5%Verified-email coverage

46.6Average contacts per company

11-50Median size (employees)

100.0%Largest-city concentration · London

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

297

11-50

213

51-200

107

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 658 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 IT outsourcing services, 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 “IT outsourcing services”. 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 IT outsourcing services), 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 IT outsourcing services, 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, 6,582 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 27, 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.

IT outsourcing services by metro in the United Kingdom

IT outsourcing services in London658
IT outsourcing services in Manchester41
IT outsourcing services in Birmingham29

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 IT outsourcing services, 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 IT outsourcing services are there based in London, United Kingdom?

RevenueBase identified 658 IT outsourcing services 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 IT outsourcing services?

London leads with 658 headquartered companies, followed by Manchester (41) and Birmingham (29).

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 6,582 verified decision-maker contacts tracked across these 658 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 27, 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.