Company lists · Data verified August 2026

Top 25 Cloud network security companies based in the United Kingdom

Name: Cloud network 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 121 companies tracked

There are 121 cloud network security companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 1,549 professional contacts across them, including 615 with verified work emails and 156 with mobile numbers. London is the largest hub.

This list covers cloud network 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.

121Companies

1,549Contacts tracked

615Verified emails

156Mobile numbers

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

Ranked by team size

Top 25 of 121 cloud network 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	Quorum Cyber	Edinburgh	201-500	292	177
2	Cyberfort	Thatcham	51-200	160	88
3	Khipu Networks	Fleet	51-200	129	94
4	Foresite Cybersecurity	Farnborough	51-200	100	67
5	Cloudrise	London	51-200	69	42
6	Coretech Security	Cheltenham	51-200	41	7
7	FLOW	Hemel Hempstead	11-50	33	19
8	Dnssense	London	51-200	30	14
9	4secure LTD	Northampton	11-50	22	13
10	Hexiosec	Cheltenham	11-50	18	11
11	Threat Intelligence Bureau LTD	Chelmsford	201-500	18	1
12	Scansafe	London	n/a	16	1
13	OUR IT Services	Cirencester	11-50	13	8
14	vdc.cloud	London	1-10	12	3
15	PC Power International LTD	London	11-50	10	8
16	EMPSN	Blisworth	1-10	10	8
17	Cykube	London	11-50	9	1
18	Cyscale	London	11-50	8	4
19	Mollis Group	London	1-10	7	3
20	Threat Protect	London	1-10	7	2
21	Cloudtrace	London	11-50	7	1
22	Terra Secure	Brigg	11-50	5	2
23	Atomos Networks	Wetherby	11-50	5	2
24	Rexel Cybersecurity	London	11-50	5	1
25	CM Security	London	11-50	5	1

Showing 25 of 121 cloud network security companies based in the United Kingdom

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

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 48 HQs

156Contacts with mobile numbers

1Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

10001+

Cloud network security companies by metro

Metro	Companies
Cloud network security companies in London	48
Cloud network security companies in Manchester	4
Cloud network security companies in Cheltenham	3
Cloud network security companies in Northampton	2
Cloud network security companies in Oxford	2
Cloud network security companies in Bristol	2
Cloud network security companies in Edinburgh	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 network 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; 1 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 network security companies are there based in the United Kingdom?

There are 121 cloud network security companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Quorum Cyber, headquartered in Edinburgh, tops this list with the largest team on record.

Which city has the most cloud network security companies?

London leads with 48 headquartered companies, followed by Manchester (4) and Cheltenham (3).

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 615 verified decision-maker contacts tracked across these 121 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.