Company lists · Data refreshed September 2026

Top 25 Cybersecurity career development companies based in the United Kingdom

Name: Cybersecurity career development companies 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 1,315 companies tracked

RevenueBase identified 1,315 company matches for cybersecurity career development companies associated with the United Kingdom as of September 2026 and tracks 22,111 professional contacts across them, including 7,120 with verified work emails. London is the largest hub.

This list covers company matches for cybersecurity career development companies 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

1,315Companies

22,111Contacts tracked

7,120Verified emails

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The 25 largest cybersecurity career development companies based in the United Kingdom

Ranked by team size

Top 25 of 1,315 company matches for cybersecurity career development companies 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	Hack The BOX	Exact match	Folkestone, United KingdomHQ recorded Sep 28, 2026	n/a	1,975 contacts →
	Exact match “Hack The Box is the leading AI-powered cybersecurity readiness and upskilling platform, trusted by 1,500+ organizations worldwide, including Fortune 500 enterprises, government…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
3	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
4	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
5	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
6	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
7	Capslock	Exact match	Manchester, United KingdomHQ recorded Sep 28, 2026	n/a	227 contacts →
	Exact match “At CAPSLOCK, we’re redefining how adults transition into cyber security.” 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	Security Blue Team	Exact match	London, United KingdomHQ recorded Sep 28, 2026	n/a	171 contacts →
	Exact match “Security Blue Team is now Centri.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
10	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
11	Performanta	Exact match	Maidenhead, United KingdomHQ recorded Sep 28, 2026	51-200	156 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 · Sep 28, 2026 · View company records in RevenueBase
12	CCL Solutions Group	Exact match	Stratford Upon Avon, United KingdomHQ recorded Sep 28, 2026	51-200	138 contacts →
	Exact match “CCL Solutions Group is one of Europe’s leading digital forensics, digital investigation and cyber security specialists, supporting law enforcement, government agencies, military…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
13	Khipu Networks	Exact match	Fleet, United KingdomHQ recorded Sep 28, 2026	51-200	125 contacts →
	Exact match “KHIPU Networks is an award winning international Cyber Security Company delivering a wide range of network, wireless and security solutions, technologies and services across…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
14	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
15	Instil	Exact match	Belfast, United KingdomHQ recorded Sep 28, 2026	51-200	123 contacts →
	Exact match “At Instil, we help technology brands transform, innovate and disrupt their markets with secure, category-defining software.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
16	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
17	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
18	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
19	Optima Training & Consultancy LTD	Exact match	Harlow, United KingdomHQ recorded Sep 28, 2026	11-50	87 contacts →
	Exact match “At Optima IT we have a wealth of professional training and consultancy experience.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
20	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
21	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
22	Cybersmart	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	84 contacts →
	Exact match “Cybersecurity should be simple.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
23	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
24	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
25	Virtual IT LTD	Exact match	South & West Hampstead, United KingdomHQ recorded Sep 28, 2026	51-200	79 contacts →
	Exact match “Virtual IT are a leading provider of cyber-secure cloud and managed IT services in the UK, entrusted by over 700 businesses and schools as their end-to-end technology partner.” 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 career development companies”. 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 1,315 cybersecurity career development companies based in the United Kingdom

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Cybersecurity career development companies based in the United Kingdom at a glance

As of Sep 28, 2026

32.2%Verified-email coverage

16.8Average contacts per company

1-10Median size (employees)

39.2%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

853

11-50

347

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 1,315 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 career development companies” 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 7,120 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 career development companies 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 career development companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many cybersecurity career development companies are there based in the United Kingdom?

RevenueBase identified 1,315 company matches for cybersecurity career development companies 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 career development companies?

London leads with 516 company records, followed by Manchester (69) and Birmingham (31).

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 7,120 professional contacts with verified work emails tracked across these 1,315 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.