Company lists · Data verified August 2026

Top 25 Cloud computing security companies based in the United Kingdom

Name: Cloud computing 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 112 companies tracked

There are 112 cloud computing security companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 7,866 professional contacts across them, including 4,221 with verified work emails and 1,366 with mobile numbers. London is the largest hub.

This list covers cloud computing 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.

112Companies

7,866Contacts tracked

4,221Verified emails

1,366Mobile numbers

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

Ranked by team size

Top 25 of 112 cloud computing 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	Iomart	Glasgow	201-500	422	200
4	Quorum Cyber	Edinburgh	201-500	292	177
5	Obsidian Security	Cheltenham	51-200	234	159
6	Cyberfort	Thatcham	51-200	160	88
7	Bulletproof Cyber Security	London	51-200	118	75
8	Echoworx	London	51-200	79	50
9	Eset UK	Bournemouth	51-200	66	41
10	Iland 11 11 Systems	Ascot	1,001-5,000	59	20
11	Eticloud	Sheffield	51-200	46	17
12	Online Support	London	11-50	39	24
13	AMR Cybersecurity	Cheltenham	11-50	23	17
14	Vambrace Cybersecurity	Leeds	11-50	23	11
15	Threat Intelligence Bureau LTD	Chelmsford	201-500	18	1
16	Cloudsecure	Cheltenham	11-50	15	7
17	OUR IT Services	Cirencester	11-50	13	8
18	Praeferre	London	11-50	13	2
19	vdc.cloud	London	1-10	12	3
20	Koncise	Borehamwood	1-10	9	9
21	Cykube	London	11-50	9	1
22	Cyscale	London	11-50	8	4
23	Mollis Group	London	1-10	7	3
24	Threat Protect	London	1-10	7	2
25	Cloudtrace	London	11-50	7	1

Showing 25 of 112 cloud computing security companies based in the United Kingdom

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

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 47 HQs

1,366Contacts with mobile numbers

25Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Cloud computing security companies by metro

Metro	Companies
Cloud computing security companies in London	47
Cloud computing security companies in Manchester	5
Cloud computing security companies in Cheltenham	4
Cloud computing security companies in Sheffield	3
Cloud computing security companies in Birmingham	3
Cloud computing security companies in Edinburgh	2
Cloud computing security companies in Glasgow	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 computing 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; 25 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 computing security companies are there based in the United Kingdom?

There are 112 cloud computing 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 cloud computing security companies?

London leads with 47 headquartered companies, followed by Manchester (5) and Cheltenham (4).

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 4,221 verified decision-maker contacts tracked across these 112 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.