Company lists · Data refreshed November 2026

Top 25 Cybersecurity consultancies based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 5,131 companies tracked

RevenueBase identified 5,131 company matches for cybersecurity consultancies associated with the United Kingdom as of November 2026 and tracks 82,102 professional contacts across them, including 31,803 with verified work emails. London is the largest hub.

This list covers company matches for cybersecurity consultancies 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 6, 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 6, 2026 How this list was built

5,131Companies

82,102Contacts tracked

31,803Verified emails

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The 25 largest cybersecurity consultancies based in the United Kingdom

Ranked by team size

Top 25 of 5,131 company matches for cybersecurity consultancies based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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	Sophos	Exact match	Abingdon, United KingdomHQ recorded Nov 6, 2026	5,001-10,000	5,283 contacts →
	Exact match “Sophos, a global cybersecurity leader, defends more than organizations worldwide with Sophos Fusion, the industry's first and most complete AI-native cybersecurity defense system…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Control Risks	Exact match	London, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	3,200 contacts →
	Exact match “Control Risks is a global specialist risk consultancy that helps to create secure, compliant and resilient organisations.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Darktrace	Exact match	Cambridge, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	2,645 contacts →
	Exact match “Darktrace is a global leader in AI cybersecurity, providing the essential cybersecurity platform to secure organizations today and for an ever-changing future.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Mimecast	Exact match	London, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	2,389 contacts →
	Exact match “organizations.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Hack The BOX	Exact match	Folkestone, United KingdomHQ recorded Nov 6, 2026	n/a	1,760 contacts →
	Exact match “Hack The Box is the leading cyber readiness platform for the human-AI cyber workforce, helping organizations develop and measure the capabilities of the people and AI agents…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Noventiq	Exact match	London, United KingdomHQ recorded Nov 6, 2026	5,001-10,000	1,532 contacts →
	Exact match “Noventiq (Noventiq Holdings PLC) is a leading global solutions and services provider in digital transformation and cybersecurity, headquartered in London.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Frazer-Nash Consultancy	Exact match	Leatherhead, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	1,506 contacts →
	Exact match “With offices in the UK and Australia, Frazer-Nash is a leading systems, engineering and technology company.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	CIS Security Limited	Exact match	London, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	1,029 contacts →
	Exact match “CIS Security is an independent security company equipped to help customers to solve the complex challenges in today’s digital, connected and regulated business world.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	CTS	Exact match	Manchester, United KingdomHQ recorded Nov 6, 2026	201-500	885 contacts →
	Exact match “We are the largest Google Cloud-only digital consultancy in Europe, and our mission is to change the way technology works for business.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	MTI	Exact match	Staines-upon-thames, United KingdomHQ recorded Nov 6, 2026	201-500	811 contacts →
	Exact match “MTI provides award-winning, end-to-end technology solutions and services in cyber security and data centre for over 35 years.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	MASS	Exact match	St Neots, United KingdomHQ recorded Nov 6, 2026	201-500	685 contacts →
	Exact match “MASS, part of the Cohort plc group, helps you realise the value of your data.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	Dimension Data UKI	Exact match	Fleet, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	613 contacts →
	Exact match “Dimension Data uses the power of technology to help organisations achieve great things.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	ACORA	Exact match	Burgess Hill, United KingdomHQ recorded Nov 6, 2026	501-1,000	468 contacts →
	Exact match “We’ve been on a mission to bring together people and technology since the day we were founded over 25 years ago.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	FSP	Exact match	Reading, United KingdomHQ recorded Nov 6, 2026	201-500	459 contacts →
	Exact match “FSP is a leading consultancy specialising in Data and AI, Cyber Security, Enterprise Cloud and Change Delivery, providing advisory led enterprise transformation delivered through…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Lodge Security	Exact match	Cirencester, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	449 contacts →
	Exact match “Unlike traditional security providers, we're redefining what protection means in today's world.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Resillion	Exact match	London, United KingdomHQ recorded Nov 6, 2026	501-1,000	426 contacts →
	Exact match “At Resillion, we're more than just a global leader in quality engineering, testing, and cyber security – we're your dedicated partner from the start of your project to its…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	BOXXE	Exact match	Hemel Hempstead, United KingdomHQ recorded Nov 6, 2026	201-500	397 contacts →
	Exact match “boxxe is a leading provider of hardware, software, and managed IT services for public and private sector organisations.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Kings Secure Technologies	Exact match	Bradford, United KingdomHQ recorded Nov 6, 2026	501-1,000	352 contacts →
	Exact match “Kings Secure Technologies (KST) is a high-end, enterprise-level systems integrator.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	Immersive	Exact match	Bristol, United KingdomHQ recorded Nov 6, 2026	201-500	346 contacts →
	Exact match “The leader in people-centric cyber resilience.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Bridewell	Exact match	Reading, United KingdomHQ recorded Nov 6, 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 6, 2026 · View company records in RevenueBase
21	Aspire Technology Solutions	Exact match	Gateshead, United KingdomHQ recorded Nov 6, 2026	201-500	316 contacts →
	Exact match “Welcome to Aspire Technology Solutions!” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	KOCHO	Exact match	London, United KingdomHQ recorded Nov 6, 2026	201-500	313 contacts →
	Exact match “At Kocho, we believe greatness lies in everyone.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	Trustmarque	Exact match	York, United KingdomHQ recorded Nov 6, 2026	501-1,000	297 contacts →
	Exact match “Trustmarque delivers the value of technology to bring real-life impact.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Vorboss	Exact match	London, United KingdomHQ recorded Nov 6, 2026	201-500	284 contacts →
	Exact match “We’re here to power the ambitions of London enterprises with a dedicated 100Gbps fibre network, managed IT and cybersecurity services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	ARO Technology	Exact match	Liverpool, United KingdomHQ recorded Nov 6, 2026	201-500	276 contacts →
	Exact match “ARO is an award-winning IT Services and Solutions provider with almost 30 years of expertise in Cloud, Cyber Security, IT Collaboration, Data Centre Services, and Sustainability.” Recorded in the RevenueBase company graph · Nov 6, 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 consultancies”. 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 25 of 5,131 cybersecurity consultancies based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 31,803 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Cybersecurity consultancies based in the United Kingdom at a glance

As of Nov 6, 2026

38.7%Verified-email coverage

16.0Average contacts per company

1-10Median size (employees)

36.7%Largest-city concentration · London

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

3,176

11-50

1,389

51-200

349

201-500

103

501-1,000

1,001-5,000

5,001-10,000

10001+

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 5,131 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 consultancies” 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 31,803 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 6, 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 consultancies 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 consultancies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many cybersecurity consultancies are there based in the United Kingdom?

RevenueBase identified 5,131 company matches for cybersecurity consultancies 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?

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

Which city has the most cybersecurity consultancies?

London leads with 1884 company records, followed by Manchester (147) and Birmingham (77).

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 31,803 professional contacts with verified work emails tracked across these 5,131 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 6, 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.