Company lists · Data verified August 2026

Top 25 Cloud security operations companies based in the United Kingdom

Name: Cloud security operations 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 229 companies tracked

There are 229 cloud security operations companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 7,643 professional contacts across them, including 3,652 with verified work emails and 1,012 with mobile numbers. London is the largest hub.

This list covers cloud security operations 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.

229Companies

7,643Contacts tracked

3,652Verified emails

1,012Mobile numbers

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

Ranked by team size

Top 25 of 229 cloud security operations 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	Iomart	Glasgow	201-500	422	200
3	Cyberfort	Thatcham	51-200	160	88
4	Bulletproof Cyber Security	London	51-200	118	75
5	Virtual IT LTD	Laindon	51-200	79	51
6	CIVO	London	51-200	75	38
7	Tuliptech	Leicester	51-200	68	39
8	Iland 11 11 Systems	Ascot	1,001-5,000	59	20
9	Adarma Security	Edinburgh	201-500	52	23
10	Cloudzenia	London	51-200	47	18
11	Cognetiks Consulting	London	11-50	44	14
12	skie.io	Regents Park	11-50	42	18
13	Cybaverse	London	51-200	40	23
14	Online Support	London	11-50	39	24
15	IT Farm LTD	Manchester	11-50	35	1
16	defense.com	Stevenage	51-200	32	13
17	Omnicyber Security	Solihull	11-50	31	19
18	ONAPP	London	51-200	31	11
19	Skye Cloud LTD	London London	11-50	28	20
20	AMR Cybersecurity	Cheltenham	11-50	23	17
21	Vambrace Cybersecurity	Leeds	11-50	23	11
22	Saints & Masters	Peterborough	201-500	19	10
23	Threat Intelligence Bureau LTD	Chelmsford	201-500	18	1
24	Cloud Elemental	London	11-50	17	12
25	Cloudsecure	Cheltenham	11-50	15	7

Showing 25 of 229 cloud security operations companies based in the United Kingdom

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

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 102 HQs

1,012Contacts with mobile numbers

19Emails re-verified in last 30 days

Companies by employee count

1-10

116

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Cloud security operations companies by metro

Metro	Companies
Cloud security operations companies in London	102
Cloud security operations companies in Manchester	9
Cloud security operations companies in Glasgow	8
Cloud security operations companies in Bristol	4
Cloud security operations companies in Leicester	3
Cloud security operations companies in Telford	3
Cloud security operations companies in Birmingham	3

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 operations 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; 19 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 operations companies are there based in the United Kingdom?

There are 229 cloud security operations 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 operations companies?

London leads with 102 headquartered companies, followed by Manchester (9) and Glasgow (8).

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 3,652 verified decision-maker contacts tracked across these 229 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.