Company lists · Data verified August 2026

Top 25 Cloud security software companies based in the United Kingdom

Name: Cloud security software 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 169 companies tracked

There are 169 cloud security software companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 8,212 professional contacts across them, including 4,298 with verified work emails and 1,485 with mobile numbers. London is the largest hub.

This list covers cloud security software 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.

169Companies

8,212Contacts tracked

4,298Verified emails

1,485Mobile numbers

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

Ranked by team size

Top 25 of 169 cloud security software 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	Synacor	London	201-500	182	81
7	Grey Matter	Ashburton	51-200	103	51
8	Telesoft	Blandford	51-200	68	19
9	Eset UK	Bournemouth	51-200	66	41
10	Iland 11 11 Systems	Ascot	1,001-5,000	59	20
11	Attivo Networks , A Sentinelone Company	Cambridge	1,001-5,000	57	21
12	Cloudmark	London	51-200	54	18
13	Tessian	London	201-500	52	27
14	Eticloud	Sheffield	51-200	46	17
15	Coretech Security	Cheltenham	51-200	41	7
16	IT Farm LTD	Manchester	11-50	35	1
17	defense.com	Stevenage	51-200	32	13
18	ONAPP	London	51-200	31	11
19	Clearswift	Berkshire	201-500	19	4
20	Hexiosec	Cheltenham	11-50	18	11
21	QWARE	Winchester	11-50	18	10
22	Threat Intelligence Bureau LTD	Chelmsford	201-500	18	1
23	Cloud Fruition Technologies	London	11-50	17	4
24	Cyberhive	Newbury	11-50	16	11
25	Blockapt	Southwark	11-50	16	9

Showing 25 of 169 cloud security software companies based in the United Kingdom

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

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 73 HQs

1,485Contacts with mobile numbers

27Emails 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 security software companies by metro

Metro	Companies
Cloud security software companies in London	73
Cloud security software companies in Manchester	7
Cloud security software companies in Cheltenham	4
Cloud security software companies in Glasgow	4
Cloud security software companies in Sheffield	3
Cloud security software companies in Birmingham	3
Cloud security software companies in Newcastle Upon Tyne	2
Cloud security software companies in Cambridge	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 security software 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; 27 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 software companies are there based in the United Kingdom?

There are 169 cloud security software 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 software companies?

London leads with 73 headquartered companies, followed by Manchester (7) 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 4,298 verified decision-maker contacts tracked across these 169 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.