Company lists · Data verified August 2026

Top 25 AI cybersecurity companies based in London, United Kingdom

Name: AI cybersecurity companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 233 companies tracked

There are 233 AI cybersecurity companies headquartered in London, United Kingdom (RevenueBase, August 2026). RevenueBase tracks 5,205 professional contacts across them, including 1,169 with verified work emails and 740 with mobile numbers. London is the largest hub.

This list covers AI cybersecurity companies headquartered in London, 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.

233Companies

5,205Contacts tracked

1,169Verified emails

740Mobile numbers

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The 25 largest AI cybersecurity companies based in London, United Kingdom

Ranked by team size

Top 25 of 233 AI cybersecurity companies based in London, 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	Everfox	London	1,001-5,000	635	13
2	Withsecure	London	501-1,000	614	329
3	QODEA	London	201-500	237	35
4	Gorilla Technology Group	London	51-200	188	75
5	Prevalent AI	London	51-200	175	101
6	Bulletproof Cyber Security	London	51-200	118	75
7	Cybersmart	London	51-200	83	55
8	Cyro Cyber	London	51-200	63	10
9	Watchtowr	London	51-200	59	22
10	Garrison NOW A Part Of Everfox	London	51-200	59	2
11	Hexegic	London	51-200	52	30
12	Senseon	London	51-200	52	24
13	Cybaverse	London	51-200	40	23
14	Nothreat	London	11-50	36	16
15	Redhunt Labs	London	11-50	35	20
16	Trident Search	London	11-50	32	12
17	Torrid Networks Limited	London	51-200	32	2
18	Dnssense	London	51-200	30	14
19	Beamsec	London	11-50	26	10
20	Encode	London	51-200	25	9
21	Mindgard	London	11-50	24	15
22	Redfox Cybersecurity	London	11-50	24	6
23	CYPRO	London	11-50	22	12
24	Athenian Tech	London	11-50	22	10
25	Blackfog	London	11-50	21	17

Showing 25 of 233 AI cybersecurity companies based in London, United Kingdom

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AI cybersecurity companies based in London, United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 233 HQs

740Contacts with mobile numbers

10Emails re-verified in last 30 days

Companies by employee count

1-10

114

11-50

51-200

201-500

501-1,000

1,001-5,000

AI cybersecurity companies by metro in the United Kingdom

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 London, 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; 10 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 London, United Kingdom?

There are 233 AI cybersecurity companies headquartered in London, United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Everfox, headquartered in London, 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 1,169 verified decision-maker contacts tracked across these 233 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.