Company lists · Data refreshed August 2026

Top 25 Cloud security operations companies based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Aug 31, 2026 229 companies tracked

RevenueBase identified 229 cloud security operations companies headquartered in the United Kingdom as of August 2026 and tracks 7,643 professional contacts across them, including 3,652 with verified work emails and 1,012 with mobile numbers. London is the largest hub.

This list covers cloud security operations 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. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed August 31, 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 RevenueBase Smart Search rating on every row Refreshed Aug 31, 2026 86% judged on-target in blind review

229Companies

7,643Contacts tracked

3,652Verified emails

1,012Mobile numbers

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

Ranked by team size

Top 25 of 229 cloud security operations companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Aug 31, 2026. RevenueBase Smart Search rates how each company's information relates to cloud security operations 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 Kingdom	5,001-10,000	4,963 contacts →
	Indirect evidence “Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Source: RevenueBase Database · checked Aug 31, 2026
2	Iomart	Partial evidence	Glasgow, United Kingdom	201-500	422 contacts →
	Partial evidence “Iomart combines cutting-edge cloud technology with deep industry expertise to help organisations transform with confidence.” Source: RevenueBase Database · checked Aug 31, 2026
3	Cyberfort	Partial evidence	Thatcham, United Kingdom	51-200	160 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 Aug 31, 2026
4	Bulletproof Cyber Security	Indirect evidence	London, United Kingdom	51-200	118 contacts →
	Indirect evidence “Bulletproof is now part of WorkNest Secure.” Source: RevenueBase Database · checked Aug 31, 2026
5	Virtual IT LTD	Partial evidence	Laindon, United Kingdom	51-200	79 contacts →
	Partial evidence “Virtual IT are a leading provider of cyber-secure cloud and managed IT services in the UK, entrusted by over 700 businesses and schools as their end-to-end technology partner.” Source: RevenueBase Database · checked Aug 31, 2026
6	CIVO	Partial evidence	London, United Kingdom	51-200	75 contacts →
	Partial evidence “Civo is the Sovereign Cloud and AI platform that frees you to build without limits.” Source: RevenueBase Database · checked Aug 31, 2026
7	Tuliptech	Partial evidence	Leicester, United Kingdom	51-200	68 contacts →
	Partial evidence “TulipTech drives progress through unmatched Cloud Migration & Management capabilities, DevOps, NetOps, and SecOps.” Source: RevenueBase Database · checked Aug 31, 2026
8	Iland 11 11 Systems	Indirect evidence	Ascot, United Kingdom	1,001-5,000	59 contacts →
	Indirect evidence “11:11 Systems is a managed infrastructure solutions provider that empowers customers to modernize, protect, and manage mission-critical applications and data, leveraging 11:11’s…” Source: RevenueBase Database · checked Aug 31, 2026
9	Adarma Security	Indirect evidence	Edinburgh, United Kingdom	201-500	52 contacts →
	Indirect evidence “We are Adarma, independent leaders in detection and response services.” Source: RevenueBase Database · checked Aug 31, 2026
10	Cloudzenia	Strong evidence	London, United Kingdom	51-200	47 contacts →
	Strong evidence “CloudZenia specializes in Managed DevOps, Cloud Engineering, Migration, Backup & DR, Managed Services, and Security Solutions.” Source: RevenueBase Database · checked Aug 31, 2026
11	Cognetiks Consulting	Partial evidence	London, United Kingdom	11-50	44 contacts →
	Partial evidence “We are a leading provider of cloud advisory services, cloud migration, DevOps, automation and cloud-managed services to organizations.” Source: RevenueBase Database · checked Aug 31, 2026
12	skie.io	Indirect evidence	Regents Park, United Kingdom	11-50	42 contacts →
	Indirect evidence “As organizations scale on AWS, infrastructure becomes complex, reactive, and increasingly expensive.” Source: RevenueBase Database · checked Aug 31, 2026
13	Cybaverse	Partial evidence	London, United Kingdom	51-200	40 contacts →
	Partial evidence “The all-in-one cyber security platform that grows with you.” Source: RevenueBase Database · checked Aug 31, 2026
14	Online Support	Strong evidence	London, United Kingdom	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 Aug 31, 2026
15	IT Farm LTD	Partial evidence	Manchester, United Kingdom	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 Aug 31, 2026
16	defense.com	Partial evidence	Stevenage, United Kingdom	51-200	32 contacts →
	Partial evidence “Defense.com is transforming the way businesses manage cyber security by allowing them to easily identify, prioritise and remediate threats.” Source: RevenueBase Database · checked Aug 31, 2026
17	Omnicyber Security	Partial evidence	Solihull, United Kingdom	11-50	31 contacts →
	Partial evidence “SPECIALISTS IN IT SECURITY AND COMPLIANCE Our goal is to help customers define, develop and implement information security and compliance services, no matter what stage of the…” Source: RevenueBase Database · checked Aug 31, 2026
18	ONAPP	Partial evidence	London, United Kingdom	51-200	31 contacts →
	Partial evidence “OnApp makes cloud fast, easy & profitable for Telcos, MSPs & other cloud service providers.” Source: RevenueBase Database · checked Aug 31, 2026
19	Skye Cloud LTD	Partial evidence	London London, United Kingdom	11-50	28 contacts →
	Partial evidence “Not your standard "one-size fits all" commoditised Cloud Service Provider, Skye Cloud are passionate about the flexibility and versatility Cloud Computing has to offer and have…” Source: RevenueBase Database · checked Aug 31, 2026
20	AMR Cybersecurity	Partial evidence	Cheltenham, United Kingdom	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 Aug 31, 2026
21	Vambrace Cybersecurity	Indirect evidence	Leeds, United Kingdom	11-50	23 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 Aug 31, 2026
22	Saints & Masters	Partial evidence	Peterborough, United Kingdom	201-500	19 contacts →
	Partial evidence “Saints and Masters is a next-generation cloud infrastructure company built to serve regulated industries with secure, scalable, and compliant solutions.” Source: RevenueBase Database · checked Aug 31, 2026
23	Threat Intelligence Bureau LTD	Strong evidence	Chelmsford, United Kingdom	201-500	18 contacts →
	Strong evidence “Organisation focused on Cloud and Security” Source: RevenueBase Database · checked Aug 31, 2026
24	Cloud Elemental	Partial evidence	London, United Kingdom	11-50	17 contacts →
	Partial evidence “We help businesses simplify, modernise, and move forward with confidence in the cloud.” Source: RevenueBase Database · checked Aug 31, 2026
25	Cloudsecure	Strong evidence	Cheltenham, United Kingdom	11-50	15 contacts →
	Strong evidence “CloudSecure delivers secure software and cloud systems for security-critical environments.” Source: RevenueBase Database · checked Aug 31, 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 operations 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 operations companies.
Partial evidence: Its own public description names part of cloud security operations 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 operations 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 229 cloud security operations companies based in the United Kingdom

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

As of Aug 31, 2026

47.8%Verified-email coverage

13.2%Mobile-number coverage

33.4Average contacts per company

1-10Median size (employees)

44.5%Largest-city concentration · London

Aug 31, 2026Page data refreshed

Companies by employee count

1-10

116

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 operations 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 operations 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 operations 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 operations 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, 3,652 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 August 31, 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 operations companies by metro

Cloud security operations companies in London102

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its 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 the category the list is about. Each row is rated strong evidence when the company's own description names cloud security operations companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

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

RevenueBase identified 229 cloud security operations companies headquartered in the United Kingdom as of August 2026, matched on each company's own description of what it does rather than its industry code.

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 operations companies?

London leads with 102 headquartered companies, followed by Manchester (9) and Glasgow (8).

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 3,652 verified decision-maker contacts tracked across these 229 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 31, 2026.

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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.