Company lists · Data verified August 2026

Top 25 AI security software companies based in the United Kingdom

Name: AI security software 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 241 companies tracked

There are 241 AI security software companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 12,030 professional contacts across them, including 6,108 with verified work emails and 1,844 with mobile numbers. London is the largest hub.

This list covers AI security software 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.

241Companies

12,030Contacts tracked

6,108Verified emails

1,844Mobile numbers

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The 25 largest AI security software companies based in the United Kingdom

Ranked by team size

Top 25 of 241 AI security software 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	Quorum Cyber	Edinburgh	201-500	292	177
6	Prevalent AI	London	51-200	175	101
7	Cipher سايڤر	London	201-500	135	50
8	Cybersmart	London	51-200	83	55
9	Telesoft	Blandford	51-200	68	19
10	Eset UK	Bournemouth	51-200	66	41
11	Watchtowr	London	51-200	59	22
12	Attivo Networks , A Sentinelone Company	Cambridge	1,001-5,000	57	21
13	Whitespace	Belfast	51-200	56	24
14	Cloudmark	London	51-200	54	18
15	S2t AI	Slough	11-50	54	4
16	Senseon	London	51-200	52	24
17	Adarma Security	Edinburgh	201-500	52	23
18	Coretech Security	Cheltenham	51-200	41	7
19	Cybaverse	London	51-200	40	23
20	Syxsense, An Absolute Security Company	Basingstoke	51-200	37	23
21	Redhunt Labs	London	11-50	35	20
22	defense.com	Stevenage	51-200	32	13
23	CYJAX	London	51-200	30	18
24	Beamsec	London	11-50	26	10
25	Riskprofiler	London	51-200	26	5

Showing 25 of 241 AI security software companies based in the United Kingdom

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AI security software companies based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 124 HQs

1,844Contacts with mobile numbers

29Emails re-verified in last 30 days

Companies by employee count

1-10

108

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

AI security software companies by metro

Metro	Companies
AI security software companies in London	124
AI security software companies in Manchester	7
AI security software companies in Edinburgh	4
AI security software companies in Cheltenham	4
AI security software companies in Bristol	3
AI security software companies in Oxford	3
AI security software companies in Leicester	3

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 security software 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; 29 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 security software companies are there based in the United Kingdom?

There are 241 AI security software 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 security software companies?

London leads with 124 headquartered companies, followed by Manchester (7) and Edinburgh (4).

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 6,108 verified decision-maker contacts tracked across these 241 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.