Company lists · Data verified August 2026

Top 25 Cloud security companies based in the United Kingdom

Name: Cloud 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 243 companies tracked

This directory lists 243 cloud security companies based in the United Kingdom, with 9,575 contacts and 4,912 email addresses. Updated August 2026, it identifies London as the single most-represented city among the companies on the list.

Cloud security companies provide products and services that protect cloud infrastructure, applications, data, workloads, identities, and access from security threats. This list covers companies that provide cloud security products or services, including cloud infrastructure protection, workload security, identity and access controls, data protection, and security monitoring. Ranked by team size, largest first. Data current as of August 28, 2026.

243Companies

9,575Contacts tracked

4,912Verified emails

1,520Mobile numbers

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The 25 largest cloud security companies based in the United Kingdom

Ranked by team size

Top 25 of 243 cloud 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	Netwrix Corporation	London	501-1,000	799	550
3	Withsecure	London	501-1,000	614	329
4	Iomart	Glasgow	201-500	422	200
5	Quorum Cyber	Edinburgh	201-500	292	177
6	Obsidian Security	Cheltenham	51-200	234	159
7	Cyberfort	Thatcham	51-200	160	88
8	Bulletproof Cyber Security	London	51-200	118	75
9	Foresite Cybersecurity	Farnborough	51-200	100	67
10	Virtual IT LTD	Laindon	51-200	79	51
11	Cloudrise	London	51-200	69	42
12	Telesoft	Blandford	51-200	68	19
13	Eset UK	Bournemouth	51-200	66	41
14	Iland 11 11 Systems	Ascot	1,001-5,000	59	20
15	Hexegic	London	51-200	52	30
16	Eticloud	Sheffield	51-200	46	17
17	Online Support	London	11-50	39	24
18	FLOW	Hemel Hempstead	11-50	33	19
19	defense.com	Stevenage	51-200	32	13
20	Omnicyber Security	Solihull	11-50	31	19
21	Mindtech Services	London	51-200	26	3
22	Encode	London	51-200	25	9
23	AMR Cybersecurity	Cheltenham	11-50	23	17
24	Vambrace Cybersecurity	Leeds	11-50	23	11
25	Saints & Masters	Peterborough	201-500	19	10

Showing 25 of 243 cloud security companies based in the United Kingdom

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Cloud security companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 113 HQs

1,520Contacts with mobile numbers

32Emails re-verified in last 30 days

Companies by employee count

1-10

122

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Cloud security companies by metro

Metro	Companies
Cloud security companies in London	113
Cloud security companies in Manchester	8
Cloud security companies in Cheltenham	6
Cloud security companies in Birmingham	4
Cloud security companies in Glasgow	3
Cloud security companies in Edinburgh	3
Cloud security companies in Sheffield	3
Cloud security companies in Leicester	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 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; 32 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 companies are based in the United Kingdom?

The list contains 243 cloud security companies based in the United Kingdom. It also includes 9,575 contacts and 4,912 email addresses.

Where are the most cloud security companies located?

London is the single most-represented city among the companies on the list. The directory covers companies based in the United Kingdom.

What do cloud security companies do?

Cloud security companies protect cloud infrastructure, applications, data, workloads, identities, and access. Their offerings can include cloud security monitoring, workload protection, identity controls, data security, and threat prevention.

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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.