Company lists · Data refreshed September 2026

Top 22 Managed security services companies based in London, United Kingdom

Name: Managed security 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 331 companies tracked

RevenueBase identified 331 managed security services companies headquartered in London, United Kingdom as of September 2026 and tracks 5,929 professional contacts across them, including 1,413 with verified work emails. London is the largest hub.

This list covers managed security 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

331Companies

5,929Contacts tracked

1,413Verified emails

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The 22 largest managed security services companies based in London, United Kingdom

Ranked by team size

Top 22 of 331 managed security 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 security 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	Corps SecurityPartial evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	847
	“Corps Security - experts in security with social value Built on over 165 years of experience, Corps provides specialist security services, across the UK, to ensure the safety of…” Source: company website · checked Sep 5, 2026
2	Ward SecurityPartial evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	419
	“Ward is an award winning, privately owned business, providing bespoke risk and security solutions including protective security personnel, explosive search dogs, narcotic search…” Source: company website · checked Sep 5, 2026
3	ObrelaPartial evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	242
	“Obrela Security Industries is a global provider of cyber security services.” Source: company website · checked Sep 5, 2026
4	IntragenStrong evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	190
	“Intragen is a cyber security business focused on managed Identity solutions and services.” Source: company website · checked Sep 5, 2026
5	Bulletproof Cyber SecurityIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	123
	“Bulletproof is now part of WorkNest Secure.” 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	CyberoneStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	96
	“CyberOne is a Microsoft Security Elite Partner and one of only 100 global Microsoft partners recognised with Microsoft-Verified Managed XDR solution status.” Source: company website · checked Sep 5, 2026
9	ITC SecurePartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	87
	“ITC Secure is an advisory-led cyber security services company.” Source: company website · checked Sep 5, 2026
10	CybersmartIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	84
	“Cybersecurity should be simple.” Source: company website · checked Sep 5, 2026
11	CybanetixStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	79
	“Cybanetix is a leading provider of managed Cyber Security Service and hosted SIEM and breach detection services.” Source: company website · checked Sep 5, 2026
12	White HAT An Epam CompanyPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	77
	“White Hat, part of the EPAM group, is an award-winning cyber intelligence and offensive security company that leverages an attacker’s perspective to shape innovative, proactive…” Source: company website · checked Sep 5, 2026
13	City Security Services Part Of City Group SecurityPartial evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	64
	“City Security Services (CSS) have more than 25 years’ experience within the corporate security, public sector, education and social housing markets delivering manned guarding…” Source: company website · checked Sep 5, 2026
14	IntruderStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	61
	“Intruder's continuous exposure management platform helps security, IT, and engineering teams stop breaches before they start.” Source: company website · checked Sep 5, 2026
15	ThreatspikeStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	61
	“ThreatSpike is the world's first AI-managed IT and security platform, replacing the legacy MSP model entirely.” Source: company website · checked Sep 5, 2026
16	TechforingIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	61
	“TechForing is a global leader in cybersecurity, dedicated to protecting digital assets and ensuring a safer cyberspace for businesses and individuals.” Source: company website · checked Sep 5, 2026
17	HexegicIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	52
	“At Hexegic we are not just passionate about protecting data through our Cyber services we are passionate about helping companies release the potential of the data they hold…” Source: company website · checked Sep 5, 2026
18	Redscan, A Kroll BusinessStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	51
	“Redscan is an award-winning provider of managed security services, specialising in Managed Detection and Response, Penetration Testing and Red Teaming.” Source: company website · checked Sep 5, 2026
19	Skylark Security LTDPartial evidence	London, United KingdomHQ checked Sep 5, 2026	n/a	34
	“Skylark is a bespoke security service provider based in London.” Source: company website · checked Sep 5, 2026
20	Cyb3rPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	32
	“CYB3R Group, is a leading provider of comprehensive Cyber Security, IT and Communications Solutions.” Source: company website · checked Sep 5, 2026
21	J2 MsspPartial 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
22	Nanjgel SolutionsPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	24
	“Nanjgel Solutions is focused on delivering the best IT security for businesses.” Source: company website · checked Sep 5, 2026

Showing 22 of 331 managed security services companies based in London, United Kingdom

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

As of Sep 5, 2026

11-50Median size (employees)

LondonLargest hub · 331 HQs

Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

146

11-50

113

51-200

201-500

501-1,000

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 331 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 security 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 security 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 security 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, 1,413 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 security services companies by metro in the United Kingdom

Managed security services companies in London331
Managed security services companies in Manchester37
Managed security services companies in Birmingham27

Frequently asked

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

RevenueBase identified 331 managed security 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?

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

Which city has the most managed security services companies?

London leads with 331 headquartered companies, followed by Manchester (37) and Birmingham (27).

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 1,413 verified decision-maker contacts tracked across these 331 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.