Company lists · Data refreshed November 2026

Top 24 Managed network security services based in the United Kingdom

RevenueBase identified 114 company matches for managed network security services associated with the United Kingdom as of November 2026 and tracks 925 professional contacts across them, including 360 with verified work emails. London is the largest hub.

This list covers company matches for managed network security services associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 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 RevenueBase SmartSearch · Exact Recorded Nov 5, 2026 How this list was built
114Companies
925Contacts tracked
360Verified emails
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The 24 largest managed network security services based in the United Kingdom

Ranked by team size
Top 24 of 114 company matches for managed network security services based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 5, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchOswestry, United KingdomHQ recorded Nov 5, 202651-20063 contacts →

Exact match

“SNO is a specialist network operations and security partner, helping organisations design, secure, and manage the networks they rely on every day.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
2Exact matchIlkley, United KingdomHQ recorded Nov 5, 202611-5059 contacts →

Exact match

“Talk Straight has been looking after the communications and network security for thousands of public and private sector organisations since 2007.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
3Exact matchRuncorn, United KingdomHQ recorded Nov 5, 202611-5053 contacts →

Exact match

“We are an IT network infrastructure managed services provider delivering enterprise networking, wireless networks, structured cabling and security solutions to customers across…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
4Exact matchDublin, United KingdomHQ recorded Nov 5, 202611-5042 contacts →

Exact match

“We are a pure play IT security company, which allows us to focus solely on protecting your business from cyber threats.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
5Exact matchChester, United KingdomHQ recorded Nov 5, 202611-5026 contacts →

Exact match

“Protos Networks is an award-winning network and cyber security services specialist based in the North West of England.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
6Exact matchEast Grinstead, United KingdomHQ recorded Nov 5, 202611-5026 contacts →

Exact match

“Blue Cube Security is a trusted UK cyber security partner with over 25 years of experience helping organisations stay secure in an increasingly complex digital world.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
7Exact matchKing's Lynn, United KingdomHQ recorded Nov 5, 202611-5014 contacts →

Exact match

“At ECS Computers, we provide fully managed IT and cyber security services for SMBs across the UK.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
8Exact matchEast Bridgford, United KingdomHQ recorded Nov 5, 202611-5014 contacts →

Exact match

“Plus 15 Limited delivers the secure infrastructure, managed IT services, and cyber security solutions that businesses rely on.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
9Exact matchCrowthorne, United KingdomHQ recorded Nov 5, 20261-1014 contacts →

Exact match

“We help businesses of all sizes with Cyber Security and Network Infrastructure projects, we aim to deliver the best solutions tailored to your unique business challenges.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
10Exact matchBlisworth, United KingdomHQ recorded Nov 5, 20261-1013 contacts →

Exact match

“emPSN provide secure connections for the public good across the East Midlands and beyond.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
11Exact matchGlasgow, United KingdomHQ recorded Nov 5, 202611-5013 contacts →

Exact match

“Stratiis is a Managed Service Provider based in Glasgow, delivering IT support, cybersecurity, cloud & disaster recovery, and business telecoms & connectivity to organisations…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
12Exact matchLondon, United KingdomHQ recorded Nov 5, 202611-5010 contacts →

Exact match

“Cyberseer offers Advanced Threat Detection and a 24×7 Managed Security Service (MSS).”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
13Exact matchLondon, United KingdomHQ recorded Nov 5, 202611-509 contacts →

Exact match

“PC POWER INTERNATIONAL LTD is a computer & network security company based in the City, London, United Kingdom.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
14Exact matchTadcaster, United KingdomHQ recorded Nov 5, 202611-509 contacts →

Exact match

“Founded in 2005, ITogether is on a mission to design, build and manage the most secure enterprise networks in the world.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
15Exact matchSandiacre, United KingdomHQ recorded Nov 5, 20261-109 contacts →

Exact match

“Air Sec is the specialist cyber security division of award winning Managed Service Provider, Air IT.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
16Exact matchLivingston, United KingdomHQ recorded Nov 5, 202611-508 contacts →

Exact match

“Brightridge provides clear, secure and supported technology for your business.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
17Exact matchLondon, United KingdomHQ recorded Nov 5, 20261-108 contacts →

Exact match

“Threat Protect is a vendor-agnostic cybersecurity, compliance and AI governance partner based in London, working with organisations across finance, legal, energy, pharma…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
18Exact matchMilton Keynes, United KingdomHQ recorded Nov 5, 20261-106 contacts →

Exact match

“Criticalis are network security specialists providing expertise through professional services and robust innovative managed services.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
19Exact matchSouthend-on-sea, United KingdomHQ recorded Nov 5, 20261-106 contacts →

Exact match

“SECURITY | CLOUD | IT SUPPORT - Fortified IT are a Managed Security Services Provider (MSSP) in Essex…This puts us among the distinct minority of IT managed services providers…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
20Exact matchHook, United KingdomHQ recorded Nov 5, 202611-505 contacts →

Exact match

“Securus Communications delivers managed cyber security and resilient connectivity for organisations that can’t afford downtime or data breaches.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
21Exact matchWetherby, United KingdomHQ recorded Nov 5, 202611-505 contacts →

Exact match

“With a belief that the security of IT systems and networks is of primary importance to any business, Atomos Networks was created to deliver world class networks and network…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
22Exact matchBrigg, United KingdomHQ recorded Nov 5, 202611-505 contacts →

Exact match

“TerraSecure Is a bespoke security provider offering price effective solution to small, Medium and large businesses.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
23Exact matchLondon, United KingdomHQ recorded Nov 5, 202611-505 contacts →

Exact match

“CM Security provides a Managed Service of Cloud Security and Protection combined with Professional Services from specialised professionals who’ll help you implement the right mix…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
24Exact matchManchester, United KingdomHQ recorded Nov 5, 20261-105 contacts →

Exact match

“TPC Grp UK LTD stands as a distinguished managed service provider, focusing on proactive monitoring, robust security, and swift adaptability to cater to the unique needs of our…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase

Showing 24 of 114 managed network security services based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 360 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Managed network security services based in the United Kingdom at a glance

As of Nov 5, 2026
38.9%Verified-email coverage
8.1Average contacts per company
1-10Median size (employees)
23.7%Largest-city concentration · London
Nov 5, 2026Page data refreshed

Companies by employee count

1-10
62
11-50
44
51-200
8

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 114 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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
Company records associated with the United Kingdom whose business descriptions match “managed network security services” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 360 professional contacts with verified work emails across the full matched dataset. 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 November 5, 2026. Lists refresh periodically as the graph is re-checked.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

Managed network security services by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “managed network security services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many managed network security services are there based in the United Kingdom?

RevenueBase identified 114 company matches for managed network security services associated with the United Kingdom as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Specialist Network Operations tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most managed network security services?

London leads with 27 company records, followed by Sheffield (4) and Birmingham (3).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 360 professional contacts with verified work emails tracked across these 114 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 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.