Company lists · Data verified August 2026

Top 25 AI cybersecurity companies based in the United Kingdom

Name: AI cybersecurity 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 470 companies tracked

There are 470 AI cybersecurity companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 16,390 professional contacts across them, including 7,141 with verified work emails and 2,441 with mobile numbers. London is the largest hub.

This list covers AI cybersecurity 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.

470Companies

16,390Contacts tracked

7,141Verified emails

2,441Mobile numbers

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The 25 largest AI cybersecurity companies based in the United Kingdom

Ranked by team size

Top 25 of 470 AI cybersecurity 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	SISA	Leicester	201-500	739	253
4	Everfox	London	1,001-5,000	635	13
5	Withsecure	London	501-1,000	614	329
6	Bridewell	Edinburgh	201-500	304	189
7	Quorum Cyber	Edinburgh	201-500	292	177
8	QODEA	London	201-500	237	35
9	Gorilla Technology Group	London	51-200	188	75
10	Prevalent AI	London	51-200	175	101
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	Hunters	Moorgate	51-200	96	9
16	Cybersmart	London	51-200	83	55
17	Reliance Cyber	Waterloo	51-200	80	47
18	TDI Tetrad Digital Integrity	Windsor	51-200	71	39
19	Telesoft	Blandford	51-200	68	19
20	Eset UK	Bournemouth	51-200	66	41
21	Cyro Cyber	London	51-200	63	10
22	Watchtowr	London	51-200	59	22
23	Garrison NOW A Part Of Everfox	London	51-200	59	2
24	Attivo Networks , A Sentinelone Company	Cambridge	1,001-5,000	57	21
25	Hexegic	London	51-200	52	30

Showing 25 of 470 AI cybersecurity companies based in the United Kingdom

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AI cybersecurity companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 233 HQs

2,441Contacts with mobile numbers

47Emails re-verified in last 30 days

Companies by employee count

1-10

237

11-50

159

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

AI cybersecurity companies by metro

Metro	Companies
AI cybersecurity companies in London	233
AI cybersecurity companies in Manchester	18
AI cybersecurity companies in Birmingham	9
AI cybersecurity companies in Cheltenham	8
AI cybersecurity companies in Cambridge	6
AI cybersecurity companies in Edinburgh	5
AI cybersecurity companies in Bristol	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 “AI cybersecurity 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; 47 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 AI cybersecurity companies are there based in the United Kingdom?

There are 470 AI cybersecurity 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 AI cybersecurity companies?

London leads with 233 headquartered companies, followed by Manchester (18) 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 7,141 verified decision-maker contacts tracked across these 470 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.