Company lists · Data verified August 2026

Top 25 Dynamic application security testing companies based in the United Kingdom

Name: Dynamic application security testing 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 236 companies tracked

There are 236 dynamic application security testing companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 3,446 professional contacts across them, including 831 with verified work emails and 315 with mobile numbers. London is the largest hub.

This list covers dynamic application security testing 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.

236Companies

3,446Contacts tracked

831Verified emails

315Mobile numbers

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The 25 largest dynamic application security testing companies based in the United Kingdom

Ranked by team size

Top 25 of 236 dynamic application security testing 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	Resillion	Glasgow	501-1,000	387	203
2	Portswigger	Knutsford	51-200	261	89
3	Appcheck LTD	Leeds	51-200	97	64
4	CSA Cyber	Gloucester	51-200	68	31
5	Covertswarm	London	51-200	65	41
6	MDSEC	Macclesfield	11-50	60	33
7	Redhunt Labs	London	11-50	35	20
8	Secarma LTD	Manchester	11-50	34	23
9	The Secops Group	Cambridge	11-50	34	22
10	Aristi	Birmingham	11-50	32	10
11	Salus Cyber	Cheltenham	11-50	31	18
12	Procheckup PCU	Portsmouth	11-50	30	18
13	Equixly	London	11-50	28	21
14	Cyber Security Specialists	Altrincham Manchester	11-50	27	9
15	Ssl247 A Sectigo Company	London	51-200	24	1
16	Cybercrowd	Newbury	11-50	23	17
17	Audacix Makers Of Cyber Chief & Qsome	London	11-50	20	3
18	Secure Purple	London	11-50	20	2
19	th4ts3cur1ty.company	London	11-50	19	13
20	Halo I.S	Leeds	11-50	19	9
21	Eh1-Infotech Cybersecurity	London	11-50	15	1
22	Ruptura Infosecurity	Milton Keynes	11-50	12	7
23	Secureteam LTD	London	11-50	10	5
24	Mobius Binary	Bath	11-50	10	5
25	Equilibrium Security	Birmingham	11-50	9	5

Showing 25 of 236 dynamic application security testing companies based in the United Kingdom

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Dynamic application security testing companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 97 HQs

315Contacts with mobile numbers

2Emails re-verified in last 30 days

Companies by employee count

1-10

150

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Dynamic application security testing companies by metro

Metro	Companies
Dynamic application security testing companies in London	97
Dynamic application security testing companies in Manchester	14
Dynamic application security testing companies in Birmingham	8
Dynamic application security testing companies in Leeds	6
Dynamic application security testing companies in Milton Keynes	3
Dynamic application security testing companies in Cambridge	3
Dynamic application security testing companies in Brighton	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 “dynamic application security testing 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; 2 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 dynamic application security testing companies are there based in the United Kingdom?

There are 236 dynamic application security testing companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Resillion, headquartered in Glasgow, tops this list with the largest team on record.

Which city has the most dynamic application security testing companies?

London leads with 97 headquartered companies, followed by Manchester (14) and Birmingham (8).

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 831 verified decision-maker contacts tracked across these 236 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.