Company lists · Data verified August 2026

Top 25 Endpoint security companies based in the United Kingdom

Name: Endpoint security 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 68 companies tracked

There are 68 endpoint security companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 5,923 professional contacts across them, including 3,139 with verified work emails and 988 with mobile numbers. London is the largest hub.

This list covers endpoint security 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.

68Companies

5,923Contacts tracked

3,139Verified emails

988Mobile numbers

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The 25 largest endpoint security companies based in the United Kingdom

Ranked by team size

Top 25 of 68 endpoint security 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	Quorum Cyber	Edinburgh	201-500	292	177
3	Becrypt	London	51-200	69	56
4	Eset UK	Bournemouth	51-200	66	41
5	Garrison NOW A Part Of Everfox	London	51-200	59	2
6	Attivo Networks , A Sentinelone Company	Cambridge	1,001-5,000	57	21
7	Cloudmark	London	51-200	54	18
8	Syxsense, An Absolute Security Company	Basingstoke	51-200	37	23
9	Surf Security	London	11-50	26	18
10	Sentrybay	London	201-500	25	15
11	Pointwire	Royston	11-50	25	13
12	Securenvoy	n/a	51-200	25	8
13	Scansafe	London	n/a	16	1
14	PC Power International LTD	London	11-50	10	8
15	Corrata	London	11-50	8	3
16	Tactile Technology	Birmingham	1-10	6	4
17	Terra Secure	Brigg	11-50	5	2
18	Securityzones	London	11-50	5	1
19	Apoc IT	Liverpool	1-10	4	1
20	Trusted Knight Corporation	London	11-50	3	2
21	C4 Secure	Daventry	1-10	3	2
22	Compudoug Services Limited	Feering	1-10	3	1
23	DLP Assured	London	51-200	2	2
24	Fortress APP Techie Support LTD	Exeter	1-10	2	2
25	Sense Defence AI	London	51-200	2	1

Showing 25 of 68 endpoint security companies based in the United Kingdom

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Endpoint security companies based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 27 HQs

988Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

5,001-10,000

10001+

Endpoint security companies by metro

Metro	Companies
Endpoint security companies in London	27
Endpoint security companies in Liverpool	2
Endpoint security companies in Bristol	2
Endpoint security companies in Edinburgh	2
Endpoint security companies in Basingstoke	2
Endpoint security companies in Cambridge	1
Endpoint security companies in Birmingham	1

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 “endpoint security 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 endpoint security companies are there based in the United Kingdom?

There are 68 endpoint security 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 endpoint security companies?

London leads with 27 headquartered companies, followed by Liverpool (2) and Bristol (2).

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 3,139 verified decision-maker contacts tracked across these 68 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.