Company lists · Data verified August 2026

Top 25 Cybersecurity skills testing platforms based in the United Kingdom

Name: Cybersecurity skills testing platforms 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 283 companies tracked

There are 283 cybersecurity skills testing platforms headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 14,392 professional contacts across them, including 1,288 with verified work emails and 744 with mobile numbers. London is the largest hub.

This list covers cybersecurity skills testing platforms 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.

283Companies

14,392Contacts tracked

1,288Verified emails

744Mobile numbers

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The 25 largest cybersecurity skills testing platforms based in the United Kingdom

Ranked by team size

Top 25 of 283 cybersecurity skills testing platforms 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	Hackerone	London	n/a	5,938	402
2	Tryhackme	London	n/a	2,923	90
3	Hack The BOX	Folkestone	n/a	1,946	21
4	Security Blue Team	London	n/a	173	30
5	Cybersmart	London	51-200	83	55
6	Cyber Ranges	Sheffield	51-200	83	39
7	Covertswarm	London	51-200	65	41
8	Sans Emea	Swansea	201-500	55	30
9	Coretech Security	Cheltenham	51-200	41	7
10	Cybaverse	London	51-200	40	23
11	Proofpoint Security Awareness Training	London	51-200	36	25
12	Boxphish	Leeds	11-50	36	23
13	Redhunt Labs	London	11-50	35	20
14	Secarma LTD	Manchester	11-50	34	23
15	Notsosecure Training Part Of Claranet Cyber Security	London	1,001-5,000	33	26
16	Aristi	Birmingham	11-50	32	10
17	Salus Cyber	Cheltenham	11-50	31	18
18	Citation Cyber	Bailrigg	11-50	30	11
19	Bob's Business The Cybersecurity Culture Company	Barnsley	11-50	29	13
20	Adeptis Group	Brighton	11-50	26	6
21	Ssl247 A Sectigo Company	London	51-200	24	1
22	Secure Purple	London	11-50	20	2
23	th4ts3cur1ty.company	London	11-50	19	13
24	SE Labs	London	11-50	19	11
25	Halo I.S	Leeds	11-50	19	9

Showing 25 of 283 cybersecurity skills testing platforms based in the United Kingdom

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Cybersecurity skills testing platforms based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 122 HQs

744Contacts with mobile numbers

2Emails re-verified in last 30 days

Companies by employee count

1-10

168

11-50

51-200

201-500

1,001-5,000

Cybersecurity skills testing platforms by metro

Metro	Companies
Cybersecurity skills testing platforms in London	122
Cybersecurity skills testing platforms in Manchester	18
Cybersecurity skills testing platforms in Cheltenham	8
Cybersecurity skills testing platforms in Birmingham	7
Cybersecurity skills testing platforms in Cambridge	6
Cybersecurity skills testing platforms in Leeds	5
Cybersecurity skills testing platforms in Brighton	4

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 skills testing platforms”, 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; 2 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 skills testing platforms are there based in the United Kingdom?

There are 283 cybersecurity skills testing platforms headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Hackerone, headquartered in London, tops this list with the largest team on record.

Which city has the most cybersecurity skills testing platforms?

London leads with 122 headquartered companies, followed by Manchester (18) and Cheltenham (8).

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 1,288 verified decision-maker contacts tracked across these 283 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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Cybersecurity skills testing platforms by geography

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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.