Company lists · Data refreshed September 2026

Top 25 Managed IT services companies based in London, United Kingdom

Name: Managed IT services 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 5, 2026 606 companies tracked

RevenueBase identified 606 managed IT services companies headquartered in London, United Kingdom as of September 2026 and tracks 9,234 professional contacts across them, including 3,692 with verified work emails. London is the largest hub.

This list covers managed IT services 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

606Companies

9,234Contacts tracked

3,692Verified emails

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The 25 largest managed IT services companies based in London, United Kingdom

Ranked by team size

Top 25 of 606 managed IT services companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names managed IT services companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	NSC GlobalIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	1,039
	“Global business doesn’t have to be complicated.” Source: company website · checked Sep 5, 2026
2	Exponential-EIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	501-1,000	667
	“Innovation is at the core of Exponential-e, and has been since our inception in 2002.” Source: company website · checked Sep 5, 2026
3	MaintelPartial evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	341
	“Maintel is a communications managed services provider.” Source: company website · checked Sep 5, 2026
4	Total IT GlobalPartial evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	286
	“At Total IT Global, we elevate your digital journey with cutting-edge innovation, to achieve your vision of ‘the enterprise of the future’.” Source: company website · checked Sep 5, 2026
5	WanstorStrong evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	227
	“Wanstor: Experience First \| AI Fluent \| Secure by Default Wanstor is a trusted Managed IT Services company that helps ambitious organisations leverage technology to achieve better…” Source: company website · checked Sep 5, 2026
6	Creative ITCStrong evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	173
	“Creative ITC is a global cloud and managed services provider built for complex design, engineering, and business critical IT environments.” Source: company website · checked Sep 5, 2026
7	Deepscale Technologies LTDStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	141
	“Deepscale Technologies provide data center, enterprise & managed IT solutions across the globe that enhance how businesses operate.” Source: company website · checked Sep 5, 2026
8	TDM GroupStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	115
	“TDM Group Ltd is a global Managed Business IT Service (M-BiTS) provider – our holistic approach to managing and implementing IT considers the impact technology has on the entire…” Source: company website · checked Sep 5, 2026
9	Doherty AssociatesStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	113
	“Doherty Associates is a Managed Service Provider delivering IT support, cyber security and AI enablement ‘beyond the call’.” Source: company website · checked Sep 5, 2026
10	Core Technology SystemsPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	105
	“Core is a managed services company for people and businesses who want to realise modern workplace technology solutions to drive their business forward.” Source: company website · checked Sep 5, 2026
11	ConoscoIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	105
	“Cybersecurity specialists providing technology and telecoms solutions that gives you the leadership, experience and resilience you need to build and secure the future of work.” Source: company website · checked Sep 5, 2026
12	TecharyIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	102
	“At Techary, we believe technology should move as fast as your business.” Source: company website · checked Sep 5, 2026
13	OryxalignIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	99
	“OryxAlign creates true alignment that delivers the right outcomes for all.” Source: company website · checked Sep 5, 2026
14	Field Work Technologies LTDIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	96
	“Promise to deliver Servicing Certainty worldwide.” Source: company website · checked Sep 5, 2026
15	BluesourceIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	92
	“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: company website · checked Sep 5, 2026
16	SysgroupStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	89
	“SysGroup is the services leader for realising AI transformation, as an award-winning managed IT services, cloud hosting, and IT consultancy provider.” Source: company website · checked Sep 5, 2026
17	Redex IT LimitedPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	89
	“Ultimate IT solutions.” Source: company website · checked Sep 5, 2026
18	ARCPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	84
	“As an IT leader, your day shouldn’t disappear to dealing with issues - that’s why we're here.” Source: company website · checked Sep 5, 2026
19	SAT MicrosystemsPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	84
	“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: company website · checked Sep 5, 2026
20	IT LABStrong evidence	London, United KingdomHQ checked Sep 5, 2026	501-1,000	84
	“IT Lab is an award-winning Technology and Managed Services Provider with more than 850 staff based in London, Manchester and Cape Town.” Source: company website · checked Sep 5, 2026
21	Instant On ITStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	69
	“Helping businesses accomplish more IT Management, Strategy and Cloud, IT Security and AI Solutions Office locations: Central London, New Zealand” Source: company website · checked Sep 5, 2026
22	FiremindIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	68
	“90% of your incidents resolved before a human is paged.” Source: company website · checked Sep 5, 2026
23	AURAIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	63
	“Aura helps global enterprises streamline communications, customer experience and AI.” Source: company website · checked Sep 5, 2026
24	Highgate IT SolutionsPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	59
	“Highgate IT Solutions is a UK-based IT services provider helping businesses with employees to reduce risk, improve efficiency, and grow with confidence.” Source: company website · checked Sep 5, 2026
25	Cardonet IT Support And Technology ServicesPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	59
	“We make IT happen.” Source: company website · checked Sep 5, 2026

Showing 25 of 606 managed IT services companies based in London, United Kingdom

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Managed IT services companies based in London, United Kingdom at a glance

As of Sep 5, 2026

11-50Median size (employees)

LondonLargest hub · 606 HQs

Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

288

11-50

223

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United Kingdom list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for London, over 606 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 managed IT services companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “managed IT services companies”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among managed IT services 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 an evidence 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, 3,692 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 5, 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.

Managed IT services companies by metro in the United Kingdom

Managed IT services companies in London606
Managed IT services companies in Manchester57
Managed IT services companies in Birmingham38
Managed IT services companies in Glasgow31
Managed IT services companies in Bristol30
Managed IT services companies in Leeds30
Managed IT services companies in Nottingham28

Frequently asked

How many managed IT services companies are there based in London, United Kingdom?

RevenueBase identified 606 managed IT services 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?

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

Which city has the most managed IT services companies?

London leads with 606 headquartered companies, followed by Manchester (57) and Birmingham (38).

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 3,692 verified decision-maker contacts tracked across these 606 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 5, 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 SmartSearch, 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.