Company lists · Data refreshed October 2026

Top 25 Cloud security companies based in the United Kingdom

Name: Cloud security companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 133 companies tracked

This directory lists 133 cloud security companies based in the United Kingdom, with 6,423 contacts and 3,294 email addresses. Updated October 2026, it identifies London as the single most-represented city among the companies on the list.

Cloud security companies provide products and services that protect cloud infrastructure, applications, data, workloads, identities, and access from security threats. This list covers companies that provide cloud security products or services, including cloud infrastructure protection, workload security, identity and access controls, data protection, and security monitoring. Ranked by team size, largest first. Data current as of October 1, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Oct 1, 2026 86% judged on-target in blind review

133Companies

6,423Contacts tracked

3,294Verified emails

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The 25 largest cloud security companies based in the United Kingdom

Ranked by team size

Top 25 of 133 cloud security companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Oct 1, 2026. RevenueBase Smart Search rates how each company's information relates to cloud security companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Sophos	Indirect evidence	Abingdon, United KingdomHQ checked Oct 1, 2026	5,001-10,000	4,925 contacts →
	Indirect evidence “Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Source: RevenueBase Database · checked Oct 1, 2026
2	Iomart	Partial evidence	Glasgow, United KingdomHQ checked Oct 1, 2026	201-500	414 contacts →
	Partial evidence “Iomart combines cutting-edge cloud technology with deep industry expertise to help organisations transform with confidence.” Source: RevenueBase Database · checked Oct 1, 2026
3	Cyberfort	Partial evidence	Thatcham, United KingdomHQ checked Oct 1, 2026	51-200	159 contacts →
	Partial evidence “At Cyberfort we are passionate about the cyber security services we deliver for our customers which keeps their people, data, systems and technology infrastructure secure…” Source: RevenueBase Database · checked Oct 1, 2026
4	Bulletproof Cyber Security	Indirect evidence	London, United KingdomHQ checked Oct 1, 2026	51-200	123 contacts →
	Indirect evidence “Bulletproof is now part of WorkNest Secure.” Source: RevenueBase Database · checked Oct 1, 2026
5	Eset UK	Indirect evidence	Bournemouth, United KingdomHQ checked Oct 1, 2026	51-200	66 contacts →
	Indirect evidence “We help businesses and individuals stay protected in an increasingly complex digital world.” Source: RevenueBase Database · checked Oct 1, 2026
6	Eticloud	Indirect evidence	Sheffield, United KingdomHQ checked Oct 1, 2026	51-200	46 contacts →
	Indirect evidence “Get to know etiCloud - Delivering tomorrow's technology, today.” Source: RevenueBase Database · checked Oct 1, 2026
7	Online Support	Strong evidence	Brentford, United KingdomHQ checked Oct 1, 2026	11-50	39 contacts →
	Strong evidence “For over 20 years, we’ve helped businesses stay productive, secure and resilient through reliable IT support, modern cloud solutions and cyber security services designed for…” Source: RevenueBase Database · checked Oct 1, 2026
8	IT Farm LTD	Partial evidence	Manchester, United KingdomHQ checked Oct 1, 2026	11-50	35 contacts →
	Partial evidence “Secure, compliant and resilient Cloud IT for legal, accounting, financial and professional service companies IT Farm helps you focus on the sustainability and long term growth of…” Source: RevenueBase Database · checked Oct 1, 2026
9	Intrinsic Security	Strong evidence	Peterborough, United KingdomHQ checked Oct 1, 2026	51-200	32 contacts →
	Strong evidence “Intrinsic Security is a UK-headquartered cybersecurity firm delivering 24/7 threat detection, incident response, and resilience across cloud, hybrid, OT, IoT, and identity…” Source: RevenueBase Database · checked Oct 1, 2026
10	Privitar	Indirect evidence	London, United KingdomHQ checked Oct 1, 2026	51-200	30 contacts →
	Indirect evidence “Privitar empowers organizations to use their data safely and ethically.” Source: RevenueBase Database · checked Oct 1, 2026
11	Vambrace Cybersecurity	Indirect evidence	Leeds, United KingdomHQ checked Oct 1, 2026	11-50	24 contacts →
	Indirect evidence “Whatever you supply, design, build, manufacture, or grow, its excelling at it that has got your business to where it is today.” Source: RevenueBase Database · checked Oct 1, 2026
12	AMR Cybersecurity	Partial evidence	Cheltenham, United KingdomHQ checked Oct 1, 2026	11-50	23 contacts →
	Partial evidence “AMR CyberSecurity delivers next generation cyber security services to assist organisations across a wide variety of sectors in understanding potential threats and effectively…” Source: RevenueBase Database · checked Oct 1, 2026
13	Cloud Fruition Technologies	Indirect evidence	London, United KingdomHQ checked Oct 1, 2026	11-50	18 contacts →
	Indirect evidence “Technology is changing faster than ever.” Source: RevenueBase Database · checked Oct 1, 2026
14	Threat Intelligence Bureau LTD	Strong evidence	Chelmsford, United KingdomHQ checked Oct 1, 2026	201-500	18 contacts →
	Strong evidence “Organisation focused on Cloud and Security” Source: RevenueBase Database · checked Oct 1, 2026
15	Bigstep	Partial evidence	London, United KingdomHQ checked Oct 1, 2026	51-200	17 contacts →
	Partial evidence “Metal Cloud Infrastructure as a Service (IaaS) provider offering single tenant, on-demand environments built for high traffic websites, micro-services architectures, IoT & mobile…” Source: RevenueBase Database · checked Oct 1, 2026
16	Sinevis	Indirect evidence	London, United KingdomHQ checked Oct 1, 2026	11-50	17 contacts →
	Indirect evidence “We are a leading cybersecurity services organization with more than a decade of proven expertise in consulting, solution implementation and managed services.” Source: RevenueBase Database · checked Oct 1, 2026
17	Datel Advansys	Indirect evidence	Warrington, United KingdomHQ checked Oct 1, 2026	11-50	14 contacts →
	Indirect evidence “Welcome to our company page!” Source: RevenueBase Database · checked Oct 1, 2026
18	Cloudsecure	Strong evidence	Cheltenham, United KingdomHQ checked Oct 1, 2026	11-50	14 contacts →
	Strong evidence “CloudSecure delivers secure software and cloud systems for security-critical environments.” Source: RevenueBase Database · checked Oct 1, 2026
19	OUR IT Services	Strong evidence	Cirencester, United KingdomHQ checked Oct 1, 2026	11-50	13 contacts →
	Strong evidence “We are Our IT Services, a rapidly growing technology company focusing on all things cloud and security.” Source: RevenueBase Database · checked Oct 1, 2026
20	Praeferre	Partial evidence	London, United KingdomHQ checked Oct 1, 2026	11-50	13 contacts →
	Partial evidence “Praeferre is an AI-powered cybersecurity company, backed by SFC Capital, shaping the future of business security and compliance.” Source: RevenueBase Database · checked Oct 1, 2026
21	vdc.cloud	Strong evidence	London, United KingdomHQ checked Oct 1, 2026	1-10	12 contacts →
	Strong evidence “Our mission is to provide business customers with effective cloud network security solutions that enhance productivity, eliminate silos, reduce costs, and achieve digital…” Source: RevenueBase Database · checked Oct 1, 2026
22	Synopsis Technology	Partial evidence	London, United KingdomHQ checked Oct 1, 2026	1-10	12 contacts →
	Partial evidence “Synopsis provides a variety of innovative and comprehensive IT Cloud solutions.” Source: RevenueBase Database · checked Oct 1, 2026
23	Defenx	Strong evidence	London, United KingdomHQ checked Oct 1, 2026	11-50	10 contacts →
	Strong evidence “Defenx is an IT company that has an extensive background in providing businesses with cloud based security solutions and support for their digital infrastructure.” Source: RevenueBase Database · checked Oct 1, 2026
24	Koncise	Indirect evidence	Borehamwood, United KingdomHQ checked Oct 1, 2026	1-10	9 contacts →
	Indirect evidence “Award-winning cybersecurity partner.” Source: RevenueBase Database · checked Oct 1, 2026
25	Skypurple Cloud	Partial evidence	Oxford, United KingdomHQ checked Oct 1, 2026	11-50	9 contacts →
	Partial evidence “skyPurple Cloud \| Smarter Cloud.” Source: RevenueBase Database · checked Oct 1, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: cloud security companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names cloud security companies.
Partial evidence: Its own public description names part of cloud security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cloud security companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 133 cloud security companies based in the United Kingdom

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Cloud security companies based in the United Kingdom at a glance

As of Oct 1, 2026

51.3%Verified-email coverage

48.3Average contacts per company

1-10Median size (employees)

41.4%Largest-city concentration · London

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

5,001-10,000

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 133 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among cloud security companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “cloud security companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names cloud security companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among cloud security companies, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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: Every listed company carries at least one verified work email, 3,294 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on October 1, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Cloud security companies by metro

Cloud security companies in London55

Frequently asked

How many cloud security companies are based in the United Kingdom?

The list contains 133 cloud security companies based in the United Kingdom. It also includes 6,423 contacts and 3,294 email addresses.

Where are the most cloud security companies located?

London is the single most-represented city among the companies on the list. The directory covers companies based in the United Kingdom.

What do cloud security companies do?

Cloud security companies protect cloud infrastructure, applications, data, workloads, identities, and access. Their offerings can include cloud security monitoring, workload protection, identity controls, data security, and threat prevention.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 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 with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.