Company lists · Data refreshed September 2026

Top 25 Cybersecurity thought leadership agencies based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 1,003 companies tracked

RevenueBase identified 1,003 company matches for cybersecurity thought leadership agencies associated with the United Kingdom as of September 2026 and tracks 18,847 professional contacts across them, including 6,607 with verified work emails. London is the largest hub.

This list covers company matches for cybersecurity thought leadership agencies 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 September 28, 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 Sep 28, 2026 How this list was built

1,003Companies

18,847Contacts tracked

6,607Verified emails

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The 25 largest cybersecurity thought leadership agencies based in the United Kingdom

Ranked by team size

Top 25 of 1,003 company matches for cybersecurity thought leadership agencies based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 28, 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 Sep 28, 2026	5,001-10,000	4,925 contacts →
	Exact match “Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
2	Securityhq	Exact match	London, United KingdomHQ recorded Sep 28, 2026	501-1,000	502 contacts →
	Exact match “SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
3	Immersive	Exact match	Bristol, United KingdomHQ recorded Sep 28, 2026	201-500	352 contacts →
	Exact match “The leader in people-centric cyber resilience.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
4	S-Rm	Exact match	London, United KingdomHQ recorded Sep 28, 2026	201-500	351 contacts →
	Exact match “S-RM is a global intelligence and cyber security consultancy.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
5	Bridewell	Exact match	Reading, United KingdomHQ recorded Sep 28, 2026	201-500	303 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 · Sep 28, 2026 · View company records in RevenueBase
6	Xalient	Exact match	Leeds, United KingdomHQ recorded Sep 28, 2026	201-500	260 contacts →
	Exact match “We are a global boutique, specializing exclusively in the convergence of identity-driven security and networking.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
7	Obrela	Exact match	London, United KingdomHQ recorded Sep 28, 2026	201-500	242 contacts →
	Exact match “Obrela Security Industries is a global provider of cyber security services.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
8	Deepcytes Cyber Labs UK	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	177 contacts →
	Exact match “Whether you’re a business or an individual, digital threats to your precious data and assets can come in any form - external or internal.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
9	Cyberfort	Exact match	Thatcham, United KingdomHQ recorded Sep 28, 2026	51-200	159 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 · Sep 28, 2026 · View company records in RevenueBase
10	Trpglobal	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	126 contacts →
	Exact match “We are TRPGLOBAL, your strategic partner in helping you with the complexities of risk management.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
11	Bulletproof Cyber Security	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	123 contacts →
	Exact match “Bulletproof is now part of WorkNest Secure.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
12	Protection Group International	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	118 contacts →
	Exact match “PGI helps organisations build digital resilience.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
13	Conosco	Exact match	London, United KingdomHQ recorded Sep 28, 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 · Sep 28, 2026 · View company records in RevenueBase
14	Caretower An Integrity360 Company	Exact match	London, United KingdomHQ recorded Sep 28, 2026	201-500	97 contacts →
	Exact match “As an independent IT security specialist, Caretower provide comprehensive solutions to individual problems, thus allowing our recommendations to be unbiased.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
15	ITC Secure	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	87 contacts →
	Exact match “ITC Secure is an advisory-led cyber security services company.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
16	Wavenet Cyberguard	Exact match	Stourport-on-severn, United KingdomHQ recorded Sep 28, 2026	201-500	86 contacts →
	Exact match “CyberGuard Technologies is the security division of Wavenet.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
17	Amethyst Risk Management	Exact match	Basingstoke, United KingdomHQ recorded Sep 28, 2026	11-50	85 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 · Sep 28, 2026 · View company records in RevenueBase
18	Foregenix	Exact match	Swindon, United KingdomHQ recorded Sep 28, 2026	51-200	80 contacts →
	Exact match “When your business relies on security, compliance and a strong reputation for taking care of your customers, you need a partner that understands your ethos, your challenges and…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
19	Reliance Cyber	Exact match	Waterloo, United KingdomHQ recorded Sep 28, 2026	51-200	80 contacts →
	Exact match “At Reliance Cyber, we believe in truly partnering with our customers.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
20	White HAT An Epam Company	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	77 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
21	Saepio Information Security	Exact match	High Wycombe, United KingdomHQ recorded Sep 28, 2026	51-200	74 contacts →
	Exact match “Saepio increase awareness, reduce risk and improve security in a continually evolving threat landscape.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
22	Dionach By Nomios	Exact match	Oxford, United KingdomHQ recorded Sep 28, 2026	51-200	73 contacts →
	Exact match “Dionach by Nomios has over 25 years of expertise in information security, supporting organisations in building resilience against ever‑evolving cyber threats.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
23	CSA Cyber	Exact match	Gloucester, United KingdomHQ recorded Sep 28, 2026	51-200	69 contacts →
	Exact match “Modern cyber resilience demands more than isolated controls.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
24	Interrupt Labs	Exact match	Basingstoke, United KingdomHQ recorded Sep 28, 2026	51-200	65 contacts →
	Exact match “We’re here to provide world-leading vulnerability research and capabilities!” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
25	Cyro Cyber	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	62 contacts →
	Exact match “Cyro Cyber are your cyber security Guardians.” Recorded in the RevenueBase company graph · Sep 28, 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 thought leadership agencies”. 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 1,003 cybersecurity thought leadership agencies based in the United Kingdom

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Cybersecurity thought leadership agencies based in the United Kingdom at a glance

As of Sep 28, 2026

35.1%Verified-email coverage

18.8Average contacts per company

1-10Median size (employees)

39.3%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

638

11-50

265

51-200

201-500

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 1,003 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 thought leadership agencies” 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 6,607 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 September 28, 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 thought leadership agencies 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 thought leadership agencies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many cybersecurity thought leadership agencies are there based in the United Kingdom?

RevenueBase identified 1,003 company matches for cybersecurity thought leadership agencies associated with the United Kingdom as of September 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 thought leadership agencies?

London leads with 394 company records, followed by Manchester (43) and Birmingham (22).

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 6,607 professional contacts with verified work emails tracked across these 1,003 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 September 28, 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.