Company lists · Data refreshed November 2026

Top 19 Cybersecurity infrastructure contractors based in the United Kingdom

Name: Cybersecurity infrastructure contractors based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 5, 2026 595 companies tracked

RevenueBase identified 595 company matches for cybersecurity infrastructure contractors associated with the United Kingdom as of November 2026 and tracks 8,642 professional contacts across them, including 3,278 with verified work emails. London is the largest hub.

This list covers company matches for cybersecurity infrastructure contractors 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

595Companies

8,642Contacts tracked

3,278Verified emails

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The 19 largest cybersecurity infrastructure contractors based in the United Kingdom

Ranked by team size

Top 19 of 595 company matches for cybersecurity infrastructure contractors 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.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Bridewell	Exact match	Reading, United KingdomHQ recorded Nov 5, 2026	201-500	327 contacts →
	Exact match “Bridewell is the trusted cyber security partner for organisations operating within Critical National Infrastructure (CNI), as well as companies who want the highest standard of…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
2	ROC Technologies	Exact match	Greenham, United KingdomHQ recorded Nov 5, 2026	201-500	256 contacts →
	Exact match “Roc Technologies delivers transformational IT solutions to public and private sector organisations across the UK.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
3	Openview Security Solutions Limited	Exact match	Romford, United KingdomHQ recorded Nov 5, 2026	201-500	203 contacts →
	Exact match “OpenView Security Solutions is the UK’S largest privately owned independent security company and provides unique, innovative and technologically excellent solutions to meet…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
4	Sapphire	Exact match	Newcastle Upon Tyne, United KingdomHQ recorded Nov 5, 2026	51-200	187 contacts →
	Exact match “Sapphire delivers comprehensive cyber solutions tailored to your needs, spanning across consultancy, managed services, IT/OT and beyond.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
5	Exclusive Networks UK	Exact match	Alton, United KingdomHQ recorded Nov 5, 2026	201-500	181 contacts →
	Exact match “Exclusive Networks is a global trusted cybersecurity specialist for digital infrastructure helping to drive the transition to a totally trusted digital future for all people and…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
6	LOGIQ	Exact match	Bradley Stoke, United KingdomHQ recorded Nov 5, 2026	201-500	164 contacts →
	Exact match “Logiq is a UK-based cyber security consultancy and secure managed services provider supporting defence, government, and critical national infrastructure (CNI) organisations where…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
7	MLL Telecom	Exact match	Marlow, United KingdomHQ recorded Nov 5, 2026	51-200	162 contacts →
	Exact match “MLL has over 25 years’ experience in designing, building and managing secure networks for the Public Sector, including local government, health, emergency services, education and…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
8	Cyberfort	Exact match	Thatcham, United KingdomHQ recorded Nov 5, 2026	51-200	161 contacts →
	Exact match “At Cyberfort we are passionate about the cyber security services we deliver for our customers which keeps their people, data, systems and technology infrastructure secure…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
9	Performanta	Exact match	Maidenhead, United KingdomHQ recorded Nov 5, 2026	51-200	157 contacts →
	Exact match “Performanta is a global cybersecurity and data risk management company dedicated to protecting people where data matters most.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
10	European Electronique	Exact match	Eynsham, United KingdomHQ recorded Nov 5, 2026	51-200	115 contacts →
	Exact match “European Electronique is a leading UK systems Integrator, specialising in the delivery of secure technology platforms including Hybrid IT, Cyber Security and Networking…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
11	Conosco	Exact match	London, United KingdomHQ recorded Nov 5, 2026	51-200	105 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
12	Optilan	Exact match	Royal Leamington Spa, United KingdomHQ recorded Nov 5, 2026	201-500	103 contacts →
	Exact match “Optilan is a leading independent security and communications systems integrator worldwide.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
13	Amethyst Risk Management	Exact match	Basingstoke, United KingdomHQ recorded Nov 5, 2026	11-50	91 contacts →
	Exact match “Amethyst Risk Management is a leading cybersecurity consultancy supplying expert services and support to the UK Government, Defence, Operators of Essential Services, and the…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
14	Reliance Cyber	Exact match	Waterloo, United KingdomHQ recorded Nov 5, 2026	51-200	84 contacts →
	Exact match “At Reliance Cyber, we believe in truly partnering with our customers.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
15	Cyro Cyber	Exact match	London, United KingdomHQ recorded Nov 5, 2026	51-200	66 contacts →
	Exact match “Cyro Cyber are your cyber security Guardians.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
16	Cyberlab	Exact match	Macclesfield, United KingdomHQ recorded Nov 5, 2026	51-200	64 contacts →
	Exact match “CyberLab is the UK-leading cyber security consultancy and managed services provider, trusted by over 1,200 enterprise businesses, government departments, and household names to…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
17	Specialist Network Operations	Exact match	Oswestry, United KingdomHQ recorded Nov 5, 2026	51-200	63 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
18	Cyberowl	Exact match	London, United KingdomHQ recorded Nov 5, 2026	51-200	63 contacts →
	Exact match “CyberOwl helps asset operators in the maritime and critical national infrastructure sectors gain visibility, cyber security and cyber compliance of systems on their distributed…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
19	Hexegic	Exact match	London, United KingdomHQ recorded Nov 5, 2026	51-200	63 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “cybersecurity infrastructure contractors”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 19 of 595 cybersecurity infrastructure contractors based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 3,278 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Cybersecurity infrastructure contractors based in the United Kingdom at a glance

As of Nov 5, 2026

37.9%Verified-email coverage

14.5Average contacts per company

1-10Median size (employees)

32.3%Largest-city concentration · London

Nov 5, 2026Page data refreshed

Companies by employee count

1-10

330

11-50

185

51-200

201-500

501-1,000

1,001-5,000

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 595 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 “cybersecurity infrastructure contractors” 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 3,278 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.

Cybersecurity infrastructure contractors 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 “cybersecurity infrastructure contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many cybersecurity infrastructure contractors are there based in the United Kingdom?

RevenueBase identified 595 company matches for cybersecurity infrastructure contractors 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?

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

Which city has the most cybersecurity infrastructure contractors?

London leads with 192 company records, followed by Manchester (26) and Birmingham (13).

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 3,278 professional contacts with verified work emails tracked across these 595 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.