Company lists · Data verified August 2026

Top 25 Cloud infrastructure security companies based in the United Kingdom

Name: Cloud infrastructure 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 226 companies tracked

There are 226 cloud infrastructure security companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 8,768 professional contacts across them, including 4,112 with verified work emails and 1,566 with mobile numbers. London is the largest hub.

This list covers cloud infrastructure 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.

226Companies

8,768Contacts tracked

4,112Verified emails

1,566Mobile numbers

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

Ranked by team size

Top 25 of 226 cloud infrastructure 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	Everfox	London	1,001-5,000	635	13
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	Appcheck LTD	Leeds	51-200	97	64
9	Virtual IT LTD	Laindon	51-200	79	51
10	Brightsolid	Dundee	51-200	77	50
11	CIVO	London	51-200	75	38
12	Cloudrise	London	51-200	69	42
13	Telesoft	Blandford	51-200	68	19
14	Intruder	London	51-200	61	35
15	Iland 11 11 Systems	Ascot	1,001-5,000	59	20
16	Coretech Security	Cheltenham	51-200	41	7
17	Secarma LTD	Manchester	11-50	34	23
18	FLOW	Hemel Hempstead	11-50	33	19
19	Cased Dimensions	Belfast	11-50	33	14
20	defense.com	Stevenage	51-200	32	13
21	Omnicyber Security	Solihull	11-50	31	19
22	Dnssense	London	51-200	30	14
23	AMR Cybersecurity	Cheltenham	11-50	23	17
24	Vambrace Cybersecurity	Leeds	11-50	23	11
25	CYPRO	London	11-50	22	12

Showing 25 of 226 cloud infrastructure security companies based in the United Kingdom

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

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 103 HQs

1,566Contacts with mobile numbers

25Emails re-verified in last 30 days

Companies by employee count

1-10

111

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Cloud infrastructure security companies by metro

Metro	Companies
Cloud infrastructure security companies in London	103
Cloud infrastructure security companies in Manchester	10
Cloud infrastructure security companies in Cheltenham	6
Cloud infrastructure security companies in Leeds	5
Cloud infrastructure security companies in Glasgow	3
Cloud infrastructure security companies in Birmingham	3
Cloud infrastructure security companies in London London	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 infrastructure 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 infrastructure security companies are there based in the United Kingdom?

There are 226 cloud infrastructure 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 infrastructure security companies?

London leads with 103 headquartered companies, followed by Manchester (10) 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 4,112 verified decision-maker contacts tracked across these 226 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.