Company lists · Data verified August 2026

Top 24 Application security consulting firms based in London, United Kingdom

Name: Application security consulting firms 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 172 companies tracked

There are 172 application security consulting firms headquartered in London, United Kingdom (RevenueBase, August 2026). RevenueBase tracks 2,016 professional contacts across them, including 271 with verified work emails and 185 with mobile numbers. London is the largest hub.

This list covers application security consulting firms 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.

172Companies

2,016Contacts tracked

271Verified emails

185Mobile numbers

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The 24 largest application security consulting firms based in London, United Kingdom

Ranked by team size

Top 24 of 172 application security consulting firms 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	Cybersec Consulting	London	201-500	141	76
2	Intruder	London	51-200	61	35
3	Riversafe	London	11-50	55	1
4	Redfox Cybersecurity	London	11-50	24	6
5	Ssl247 A Sectigo Company	London	51-200	24	1
6	Toro Solutions	London	11-50	23	17
7	LMS Security	London	11-50	20	16
8	Secure Purple	London	11-50	20	2
9	th4ts3cur1ty.company	London	11-50	19	13
10	Trustify LTD	London	11-50	17	13
11	Eh1-Infotech Cybersecurity	London	11-50	15	1
12	Everycloud AI & Data Security	London	11-50	14	9
13	Datasixth Consulting	London	51-200	14	7
14	Stratia Cyber	London	11-50	9	3
15	Rexel Cybersecurity	London	11-50	5	1
16	Cybersanctus	London	11-50	4	1
17	Shawne Applebee	London	11-50	4	1
18	Grove Group	London	51-200	3	3
19	Cansol Consulting	London	11-50	2	1
20	Sesseto Limited	London	11-50	2	1
21	Cybergate LTD	London	11-50	2	1
22	EST Applied Intelligence	London	201-500	1	1
23	Atlan Digital R&d Limited	London	11-50	1	1
24	Charlotte Badger	London	11-50	1	1

Showing 24 of 172 application security consulting firms based in London, United Kingdom

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Application security consulting firms based in London, United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 172 HQs

185Contacts with mobile numbers

1Emails re-verified in last 30 days

Companies by employee count

1-10

109

11-50

51-200

201-500

501-1,000

1,001-5,000

Application security consulting firms by metro in the United Kingdom

Metro	Companies
Application security consulting firms in London	172
Application security consulting firms in Manchester	19
Application security consulting firms in Birmingham	11
Application security consulting firms in Edinburgh	9
Application security consulting firms in Cheltenham	9
Application security consulting firms in Leeds	7
Application security consulting firms in Bristol	7

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 “application security consulting firms”, 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; 1 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 application security consulting firms are there based in London, United Kingdom?

There are 172 application security consulting firms headquartered in London, United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

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

Which city has the most application security consulting firms?

London leads with 172 headquartered companies, followed by Manchester (19) and Birmingham (11).

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 271 verified decision-maker contacts tracked across these 172 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.