Company lists · Data verified August 2026

Top 25 Cloud security monitoring companies based in the United Kingdom

Name: Cloud security monitoring 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 196 companies tracked

There are 196 cloud security monitoring companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 8,727 professional contacts across them, including 4,448 with verified work emails and 1,259 with mobile numbers. London is the largest hub.

This list covers cloud security monitoring 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.

196Companies

8,727Contacts tracked

4,448Verified emails

1,259Mobile numbers

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The 25 largest cloud security monitoring companies based in the United Kingdom

Ranked by team size

Top 25 of 196 cloud security monitoring 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	Netwrix Corporation	London	501-1,000	799	550
3	Withsecure	London	501-1,000	614	329
4	Iomart	Glasgow	201-500	422	200
5	Cyberfort	Thatcham	51-200	160	88
6	Bulletproof Cyber Security	London	51-200	118	75
7	Cybersmart	London	51-200	83	55
8	Cloudrise	London	51-200	69	42
9	Telesoft	Blandford	51-200	68	19
10	Eset UK	Bournemouth	51-200	66	41
11	Hexegic	London	51-200	52	30
12	Eticloud	Sheffield	51-200	46	17
13	Coretech Security	Cheltenham	51-200	41	7
14	Cybaverse	London	51-200	40	23
15	Online Support	London	11-50	39	24
16	Secarma LTD	Manchester	11-50	34	23
17	defense.com	Stevenage	51-200	32	13
18	Omnicyber Security	Solihull	11-50	31	19
19	Mindtech Services	London	51-200	26	3
20	AMR Cybersecurity	Cheltenham	11-50	23	17
21	Vambrace Cybersecurity	Leeds	11-50	23	11
22	Threat Intelligence Bureau LTD	Chelmsford	201-500	18	1
23	Cloudsecure	Cheltenham	11-50	15	7
24	Praeferre	London	11-50	13	2
25	Socguardians LTD	London	11-50	12	1

Showing 25 of 196 cloud security monitoring companies based in the United Kingdom

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Cloud security monitoring companies based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 88 HQs

1,259Contacts with mobile numbers

24Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

5,001-10,000

Cloud security monitoring companies by metro

Metro	Companies
Cloud security monitoring companies in London	88
Cloud security monitoring companies in Manchester	8
Cloud security monitoring companies in Cheltenham	6
Cloud security monitoring companies in Sheffield	4
Cloud security monitoring companies in Birmingham	3
Cloud security monitoring companies in Glasgow	3
Cloud security monitoring companies in Aylesbury	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 “cloud security monitoring 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; 24 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 cloud security monitoring companies are there based in the United Kingdom?

There are 196 cloud security monitoring 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 cloud security monitoring companies?

London leads with 88 headquartered companies, followed by Manchester (8) and Cheltenham (6).

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 4,448 verified decision-maker contacts tracked across these 196 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.