Company lists · Data verified August 2026

Top 25 Cybersecurity training companies based in the United Kingdom

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 805 companies tracked

There are 805 cybersecurity training companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 19,822 professional contacts across them, including 5,873 with verified work emails and 1,964 with mobile numbers. London is the largest hub.

This list covers cybersecurity training companies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

805Companies

19,822Contacts tracked

5,873Verified emails

1,964Mobile numbers

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The 25 largest cybersecurity training companies based in the United Kingdom

Ranked by team size

Top 25 of 805 cybersecurity training companies based in the United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Sophos	Abingdon	5,001-10,000	4,963	2,711
2	Tryhackme	London	n/a	2,923	90
3	Hack The BOX	Folkestone	n/a	1,946	21
4	SISA	Leicester	201-500	739	253
5	Everfox	London	1,001-5,000	635	13
6	Bridewell	Edinburgh	201-500	304	189
7	Quorum Cyber	Edinburgh	201-500	292	177
8	Cyberfort	Thatcham	51-200	160	88
9	Cybersec Consulting	London	201-500	141	76
10	Khipu Networks	Fleet	51-200	129	94
11	Bulletproof Cyber Security	London	51-200	118	75
12	Foresite Cybersecurity	Farnborough	51-200	100	67
13	ITC Secure	London	51-200	87	39
14	Wavenet Cyberguard	London	201-500	86	58
15	Cybersmart	London	51-200	83	55
16	Reliance Cyber	Waterloo	51-200	80	47
17	URM	Reading	51-200	80	38
18	Saepio Information Security	High Wycombe	51-200	73	57
19	TDI Tetrad Digital Integrity	Windsor	51-200	71	39
20	CSA Cyber	Gloucester	51-200	68	31
21	Eset UK	Bournemouth	51-200	66	41
22	Covertswarm	London	51-200	65	41
23	Cyro Cyber	London	51-200	63	10
24	Usecure	Manchester	51-200	60	46
25	Sans Emea	Swansea	201-500	55	30

Showing 25 of 805 cybersecurity training companies based in the United Kingdom

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Cybersecurity training companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 314 HQs

1,964Contacts with mobile numbers

9Emails re-verified in last 30 days

Companies by employee count

1-10

483

11-50

238

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Cybersecurity training companies by metro

Metro	Companies
Cybersecurity training companies in London	314
Cybersecurity training companies in Manchester	36
Cybersecurity training companies in Cheltenham	20
Cybersecurity training companies in Birmingham	13
Cybersecurity training companies in Edinburgh	11
Cybersecurity training companies in Cambridge	9
Cybersecurity training companies in Milton Keynes	9

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “cybersecurity training companies”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
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: Contact records re-verify on a rolling cadence; 9 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

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

There are 805 cybersecurity training companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Sophos, headquartered in Abingdon, tops this list with the largest team on record.

Which city has the most cybersecurity training companies?

London leads with 314 headquartered companies, followed by Manchester (36) and Cheltenham (20).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 5,873 verified decision-maker contacts tracked across these 805 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.