Company lists · Data refreshed September 2026
Top 25 Security information and event management companies based in the United Kingdom
RevenueBase identified 228 security information and event management companies headquartered in the United Kingdom as of September 2026 and tracks 7,644 professional contacts across them, including 3,417 with verified work emails and 988 with mobile numbers. London is the largest hub.
This list covers security information and event management 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, how directly it supports the match, and when it was last checked. Data refreshed September 6, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 security information and event management companies based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 4,925 | ||||
“Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | 242 | ||||
“Obrela Security Industries is a global provider of cyber security services.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | 125 | ||||
“KHIPU Networks is an award winning international Cyber Security Company delivering a wide range of network, wireless and security solutions, technologies and services across…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 97 | ||||
“As an independent IT security specialist, Caretower provide comprehensive solutions to individual problems, thus allowing our recommendations to be unbiased.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | 95 | ||||
“SEP2 is an award-winning UK-based cyber security specialist service provider, powered by a dedicated team of experts available 24/7/365.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 79 | ||||
“Cybanetix is a leading provider of managed Cyber Security Service and hosted SIEM and breach detection services.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | 68 | ||||
“The organisations that run our world face relentless complexity and evolving threats.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | NEXORPartial evidence | 59 | |||
“Nexor is a Secure Information Exchange Specialist offering High Assurance threat and risk mitigation expertise and solutions into complex and sensitive networks globally.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | 54 | ||||
“SenseOn deploys alongside all of your existing tools, unifying them into a single investigation plane and augmenting your team with cross-domain correlation, analytics, and…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | Adarma SecurityIndirect evidence | 51 | |||
“We are Adarma, independent leaders in detection and response services.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | 45 | ||||
“Established in 2004 (acquired by Gamma in 2023), Satisnet, a Gamma company is a pedigree-proven cyber security services and solutions specialist with a fully UK-based 24x7x365 SOC.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 39 | ||||
“We help organisations understand, optimise, and strengthen their cybersecurity.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | 38 | ||||
“Omerta - A Global Security Technology and Services Company.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 34 | ||||
“We are your strategic cybersecurity partner – going beyond traditional models to deliver agile, expert-led protection tailored to the needs of regulated industries and critical…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 32 | ||||
“Defense.com is transforming the way businesses manage cyber security by allowing them to easily identify, prioritise and remediate threats.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | 32 | ||||
“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: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | Nanjgel SolutionsPartial evidence | 24 | |||
“Nanjgel Solutions is focused on delivering the best IT security for businesses.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | 22 | ||||
“Blue Cube Security is a trusted UK cyber security partner with over 25 years of experience helping organisations stay secure in an increasingly complex digital world.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | Cyber EnergiaPartial evidence | 20 | |||
“Cyber Energia – Your Comprehensive Cyber Security Solution for a smart & sustainable energy market Cyber Energia is a dynamic managed security service provider offering OT / SCADA…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | 20 | ||||
“Formed in 2018, NGS (UK) Ltd are independent, Next Generation Security trusted advisors, providing all-encompassing solutions from the perimeter to the endpoint.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | 17 | ||||
“We help organisations turn security, operations and log data into actionable intelligence - so monitoring platforms deliver real outcomes, not just dashboards.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | Policy Monitor LimitedStrong evidence | 17 | |||
“Policy Monitor provides security policy management solutions and services to measure, manage and monitor cyber risk, and guard against cyber-attacks.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | 15 | ||||
“Who We Are DataSixth delivers Cybersecurity Intelligence.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | ISM LTDStrong evidence | 15 | |||
“ISM is a Solutions Business with more than 30 years world leading experience in the manufacturing and inventing of integrated security management solutions, encompassing alarm…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 25 | First City CarePartial evidence | 15 | |||
“Electronic Security Systems Design, Installation and Maintenance Provider.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 228 security information and event management companies based in the United Kingdom
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Security information and event management companies based in the United Kingdom at a glance
As of Sep 6, 2026Companies by employee count
Verified emails by last verification
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 security information and event management companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “security information and event management companies”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among security information and event management 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 an evidence 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, 3,417 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 September 6, 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.
Security information and event management companies by metro
- Security information and event management companies in London90
Frequently asked
How many security information and event management companies are there based in the United Kingdom?
RevenueBase identified 228 security information and event management companies headquartered in the United Kingdom as of September 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 security information and event management companies?
London leads with 90 headquartered companies, followed by Birmingham (7) and Glasgow (5).
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 3,417 verified decision-maker contacts tracked across these 228 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 6, 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 SmartSearch, 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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