Company lists · Data refreshed August 2026
Top 25 Cloud email security companies based in the United Kingdom
RevenueBase identified 110 cloud email security companies headquartered in the United Kingdom as of August 2026 and 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. 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.
The 25 largest cloud email security companies based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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, 2026Thanks. The Data Team will review it. | |||||
| 2 | 79 contacts → | ||||
Partial evidence “Echoworx protects the privacy of people and businesses throughout the world by making email data protection easier.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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, 2026Thanks. The Data Team will review it. | |||||
| 4 | 54 contacts → | ||||
Indirect evidence “Cloudmark was acquired by Proofpoint.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 5 | 52 contacts → | ||||
Indirect evidence “Tessian was acquired by Proofpoint.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 6 | 46 contacts → | ||||
Indirect evidence “Get to know etiCloud - Delivering tomorrow's technology, today.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 7 | 43 contacts → | ||||
Partial evidence “About GBS GBS is a distinguished provider of e-mail and collaboration security solutions in Germany with almost 30 years of experience in data protection, productivity and…” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 8 | 39 contacts → | ||||
Partial evidence “Libraesva secures email communications for organisations, helping them eliminate email borne threats, preserve email data and provide an environment for their people to…” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 9 | 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, 2026Thanks. The Data Team will review it. | |||||
| 10 | 34 contacts → | ||||
Indirect evidence “Spamhaus is the trusted authority on IP and domain reputation, uniquely placed in the industry because of our strong ethics, impartiality, and quality of actionable data.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 11 | 30 contacts → | ||||
Partial evidence “DNSSense, positioned under Noventiq during 2024–2025, completed a 100% local-ownership restructuring in 2025 and evolved into a Turkey-based, R&D-driven DNS security company.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 12 | 29 contacts → | ||||
Partial evidence “French startup in cybersecurity, IDECSI delivers cutting-edge technology and engages all employees in the security system for effective and cost-efficient data protection.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 13 | 18 contacts → | ||||
Strong evidence “Organisation focused on Cloud and Security” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 14 | 16 contacts → | ||||
Indirect evidence “As of December 4, 2009, ScanSafe was acquired by Cisco Systems.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 15 | 15 contacts → | ||||
Strong evidence “CloudSecure delivers secure software and cloud systems for security-critical environments.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 16 | 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 Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 17 | 12 contacts → | ||||
Partial evidence “StayPrivate Email as it should be.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 18 | 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 Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 19 | 9 contacts → | ||||
Partial evidence “StealthMail makes your emails secure and invisible to email relays, hackers, or Public Internet threats - making email relationships with clients a trusted one via StealthMail’s…” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 20 | 9 contacts → | ||||
Indirect evidence “Everything Cyber!” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 21 | 8 contacts → | ||||
Partial evidence “With over 40 years of information security experience, Hytec, a Civica company, is a trusted partner for organisations looking for expert, specialised cyber security protection.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 22 | 7 contacts → | ||||
Strong evidence “We're a multi-cloud security consultancy enabling companies to securely operate their business in the Cloud with open eyes, providing security guidance that's simple, consistent…” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 23 | 7 contacts → | ||||
Partial evidence “Threat Protect helps businesses fight cybercrime, protect data and reduce security risks.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 24 | 7 contacts → | ||||
Strong evidence “Cloudtrace is a cloud native services provider focusing exclusively on securing AWS environments.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 25 | 6 contacts → | ||||
Indirect evidence “Prolateral Consulting Ltd was founded in 2003 with its head office based in Luton, UK.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
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 email 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 email security companies.
- Partial evidence
- Its own public description names part of cloud email 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 email 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 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 31, 2026Companies by employee count
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 email 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 email 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 email 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 email 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, 369 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 email security companies by metro
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 email security 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 email security companies are there based in the United Kingdom?
RevenueBase identified 110 cloud email security 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?
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 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.
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