Company lists · Data verified August 2026

Top 25 Cloud email security companies based in the United Kingdom

Name: Cloud email 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 110 companies tracked

There are 110 cloud email security companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 937 professional contacts across them, including 369 with verified work emails and 97 with mobile numbers. London is the largest hub.

This list covers cloud email 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.

110Companies

937Contacts tracked

369Verified emails

97Mobile numbers

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

Ranked by team size

Top 25 of 110 cloud email 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	Virtual IT LTD	Laindon	51-200	79	51
2	Echoworx	London	51-200	79	50
3	Iland 11 11 Systems	Ascot	1,001-5,000	59	20
4	Cloudmark	London	51-200	54	18
5	Tessian	London	201-500	52	27
6	Eticloud	Sheffield	51-200	46	17
7	GBS Europa	Manchester	51-200	43	21
8	Libraesva	London	11-50	39	35
9	IT Farm LTD	Manchester	11-50	35	1
10	Spamhaus Technology LTD	London	11-50	34	15
11	Dnssense	London	51-200	30	14
12	Idecsi	London	11-50	29	19
13	Threat Intelligence Bureau LTD	Chelmsford	201-500	18	1
14	Scansafe	London	n/a	16	1
15	Cloudsecure	Cheltenham	11-50	15	7
16	OUR IT Services	Cirencester	11-50	13	8
17	Stayprivate	Gerrards Cross	11-50	12	6
18	vdc.cloud	London	1-10	12	3
19	Stealthmail	London	51-200	9	3
20	Cykube	London	11-50	9	1
21	Hytec Information Security, A Civica Company	Teddington	11-50	8	4
22	Mollis Group	London	1-10	7	3
23	Threat Protect	London	1-10	7	2
24	Cloudtrace	London	11-50	7	1
25	Prolateral Consulting LTD	Luton	11-50	6	4

Showing 25 of 110 cloud email security companies based in the United Kingdom

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

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 45 HQs

97Contacts 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

1,001-5,000

10001+

Cloud email security companies by metro

Metro	Companies
Cloud email security companies in London	45
Cloud email security companies in Manchester	6
Cloud email security companies in Sheffield	3
Cloud email security companies in Basingstoke	2
Cloud email security companies in Birmingham	2
Cloud email security companies in Edinburgh	2
Cloud email security companies in Cheltenham	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 email 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 email security companies are there based in the United Kingdom?

There are 110 cloud email security companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Virtual IT LTD, headquartered in Laindon, tops this list with the largest team on record.

Which city has the most cloud email security companies?

London leads with 45 headquartered companies, followed by Manchester (6) and Sheffield (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 369 verified decision-maker contacts tracked across these 110 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.