Company lists · Data verified August 2026

Top 25 Enterprise security software companies based in the United Kingdom

Name: Enterprise 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 92 companies tracked

There are 92 enterprise security software companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 862 professional contacts across them, including 367 with verified work emails and 93 with mobile numbers. London is the largest hub.

This list covers enterprise 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.

92Companies

862Contacts tracked

367Verified emails

93Mobile numbers

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

Ranked by team size

Top 25 of 92 enterprise 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	Quorum Cyber	Edinburgh	201-500	292	177
2	Becrypt	London	51-200	69	56
3	Sureview Systems	Enterprise Park	11-50	59	40
4	Maxxess	Bracknell	11-50	26	10
5	Pointwire	Royston	11-50	25	13
6	4secure LTD	Northampton	11-50	22	13
7	Assuria LTD	Reading	11-50	13	5
8	PC Power International LTD	London	11-50	10	8
9	Security Software Solutions LTD	Marlow Bucks	1-10	9	5
10	Netaccess LTD	Flitton	11-50	8	6
11	MYDIS	Redditch	11-50	8	2
12	Rebasoft Limited	Reading	11-50	7	4
13	Klaatu IT Security LTD	Swindon	1-10	7	2
14	Pixalert	Ows	11-50	6	2
15	Idappcom LTD	Ludlow	11-50	5	3
16	Xitenys	Farnham	11-50	5	3
17	Interfuture Security LTD	Balcombe	1-10	5	3
18	Akeydor Group	London	11-50	4	2
19	Trusted Knight Corporation	London	11-50	3	2
20	Winfrasoft	Bracknell	1-10	3	2
21	AVM IT	Haslemere	1-10	3	1
22	E-Manage Limited	Cornwall	1-10	2	1
23	Checksec	London	1-10	2	1
24	soc.os	London	11-50	1	1
25	Blacklight AI Owlgaze	London	11-50	1	1

Showing 25 of 92 enterprise security software companies based in the United Kingdom

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

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 34 HQs

93Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

10001+

Enterprise security software companies by metro

Metro	Companies
Enterprise security software companies in London	34
Enterprise security software companies in Reading	3
Enterprise security software companies in Edinburgh	3
Enterprise security software companies in Northampton	3
Enterprise security software companies in Leicester	2
Enterprise security software companies in Milton Keynes	2
Enterprise security software companies in Bracknell	2

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 “enterprise 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; 0 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 enterprise security software companies are there based in the United Kingdom?

There are 92 enterprise security software companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Quorum Cyber, headquartered in Edinburgh, tops this list with the largest team on record.

Which city has the most enterprise security software companies?

London leads with 34 headquartered companies, followed by Reading (3) and Edinburgh (3).

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 367 verified decision-maker contacts tracked across these 92 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.