Company lists · Data verified August 2026

Top 25 Cybersecurity threat detection companies based in the United Kingdom

Name: Cybersecurity threat detection 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 443 companies tracked

There are 443 cybersecurity threat detection companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 18,733 professional contacts across them, including 8,248 with verified work emails and 3,171 with mobile numbers. London is the largest hub.

This list covers cybersecurity threat detection 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.

443Companies

18,733Contacts tracked

8,248Verified emails

3,171Mobile numbers

Unlock all 443 companies Free account · no credit card · 2 minutes

The 25 largest cybersecurity threat detection companies based in the United Kingdom

Ranked by team size

Top 25 of 443 cybersecurity threat detection 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	Darktrace	Cambridge	1,001-5,000	2,590	1,791
3	Zerofox	n/a	501-1,000	894	382
4	SISA	Leicester	201-500	739	253
5	Extrahop	London	501-1,000	730	414
6	Claroty	London	501-1,000	729	152
7	Everfox	London	1,001-5,000	635	13
8	Withsecure	London	501-1,000	614	329
9	Quorum Cyber	Edinburgh	201-500	292	177
10	Netcraft	London	201-500	206	105
11	Cyberfort	Thatcham	51-200	160	88
12	Khipu Networks	Fleet	51-200	129	94
13	Bulletproof Cyber Security	London	51-200	118	75
14	Foresite Cybersecurity	Farnborough	51-200	100	67
15	Sep2	London	51-200	99	20
16	Cyberone	London	51-200	96	39
17	Hunters	Moorgate	51-200	96	9
18	Titania LTD	London	51-200	89	47
19	Wavenet Cyberguard	London	201-500	86	58
20	Cybersmart	London	51-200	83	55
21	Cybanetix	London	51-200	78	45
22	TDI Tetrad Digital Integrity	Windsor	51-200	71	39
23	Telesoft	Blandford	51-200	68	19
24	Izoologic	City Of London	201-500	67	48
25	Eset UK	Bournemouth	51-200	66	41

Showing 25 of 443 cybersecurity threat detection companies based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 8,248 reachable decision-makers.

Free account · no credit card

See all 443 companies

Cybersecurity threat detection companies based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 219 HQs

3,171Contacts with mobile numbers

20Emails re-verified in last 30 days

Companies by employee count

1-10

200

11-50

150

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Cybersecurity threat detection companies by metro

Metro	Companies
Cybersecurity threat detection companies in London	219
Cybersecurity threat detection companies in Manchester	13
Cybersecurity threat detection companies in Birmingham	9
Cybersecurity threat detection companies in Cheltenham	7
Cybersecurity threat detection companies in Glasgow	6
Cybersecurity threat detection companies in Oxford	5
Cybersecurity threat detection companies in Cambridge	5

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 threat detection 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; 20 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 threat detection companies are there based in the United Kingdom?

There are 443 cybersecurity threat detection 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 threat detection companies?

London leads with 219 headquartered companies, followed by Manchester (13) and Birmingham (9).

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 8,248 verified decision-maker contacts tracked across these 443 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.

Ready to reach these companies? Verified emails and direct dials for all 443 cybersecurity threat detection companies based in the United Kingdom. Start with a free account, no credit card.

Get the full list

Related lists

Cybersecurity threat detection companies by geography

Browse the directory

Browse: Companies home · All United Kingdom lists · All Cybersecurity threat detection companies lists · New lists

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.