Company lists · Data refreshed September 2026

Top 23 Managed service providers based in London, United Kingdom

Name: Managed 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 5, 2026 539 companies tracked

RevenueBase identified 539 managed service providers headquartered in London, United Kingdom as of September 2026 and tracks 7,322 professional contacts across them, including 2,432 with verified work emails. London is the largest hub.

This list covers managed 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, 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

539Companies

7,322Contacts tracked

2,432Verified emails

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The 23 largest managed service providers based in London, United Kingdom

Ranked by team size

Top 23 of 539 managed service providers 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 service providers: 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	Excis ComplianceIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	616
	“Excis is a trusted global IT services company, delivering agile, multilingual support across 150+ countries.” Source: company website · checked Sep 5, 2026
3	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
4	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
5	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
6	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
7	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
8	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
9	ARCIndirect 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
10	SAT MicrosystemsIndirect 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
11	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
12	Highgate IT SolutionsIndirect 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
13	VirtuosoIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	50
	“Virtuoso provides award-winning strategic technology support to businesses across the United Kingdom, New Zealand & Australia.” Source: company website · checked Sep 5, 2026
14	Optimity LTDStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	47
	“Optimity is a dynamic technology managed service provider based in the heart of London.” Source: company website · checked Sep 5, 2026
15	Totality ServicesStrong evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	45
	“totality services is a leading Managed Service Provider (MSP) based in London.” Source: company website · checked Sep 5, 2026
16	Chase IT GlobalIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	43
	“Chase IT Global delivers enterprise IT field services, migrations and rollout projects wherever our clients need us.” Source: company website · checked Sep 5, 2026
17	Phoenix47Strong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	40
	“Phoenix47 is an IT infrastructure services company providing Support Desk, Managed Services and Professional Services.” Source: company website · checked Sep 5, 2026
18	Techno NetworksStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	38
	“We are focused on providing on-demand and well-managed IT support services around the globe and around the clock.” Source: company website · checked Sep 5, 2026
19	WWCSIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	37
	“WWCS is an IT Consultancy specialising in Business Computer Networks and Support.” Source: company website · checked Sep 5, 2026
20	Plan-NetIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	36
	“Plan-Net is the home of Business Advantage IT.” Source: company website · checked Sep 5, 2026
21	B-612 Remote Hands & Eyes SupportStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	33
	“Trusted Partner of Your Network Infrastructure Managing network infrastructure in Data-Centres on behalf of a wide range of colocation users since 2009, B-612 offers a…” Source: company website · checked Sep 5, 2026
22	Cloudcoco PLCIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	32
	“CloudCoCo helps organisations modernise, secure and scale their IT with services designed for the way businesses work now.” Source: company website · checked Sep 5, 2026
23	J2 MsspIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	29
	“Cyber security is the modern business' greatest risk.” Source: company website · checked Sep 5, 2026

Showing 23 of 539 managed service providers based in London, United Kingdom

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Managed service providers based in London, United Kingdom at a glance

As of Sep 5, 2026

11-50Median size (employees)

LondonLargest hub · 539 HQs

Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

260

11-50

193

51-200

201-500

1,001-5,000

10001+

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 539 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 service providers, 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 service providers”. 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 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 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, 2,432 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 service providers by metro in the United Kingdom

Managed service providers in London539
Managed service providers in Manchester49
Managed service providers in Birmingham36
Managed service providers in Bristol31
Managed service providers in Leeds28
Managed service providers in Sheffield26

Frequently asked

How many managed service providers are there based in London, United Kingdom?

RevenueBase identified 539 managed 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?

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

Which city has the most managed service providers?

London leads with 539 headquartered companies, followed by Manchester (49) and Birmingham (36).

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 2,432 verified decision-maker contacts tracked across these 539 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.