Company lists · Data refreshed September 2026
Top 25 Extended detection and response platforms based in the United Kingdom
RevenueBase identified 68 extended detection and response platforms headquartered in the United Kingdom as of September 2026 and tracks 10,593 professional contacts across them, including 5,710 with verified work emails and 2,080 with mobile numbers. London is the largest hub.
This list covers extended detection and response platforms 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 2, 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 extended detection and response platforms based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 4,963 | ||||
“Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 2 | 2,590 | ||||
“Darktrace is a global leader in AI cybersecurity, providing the essential cybersecurity platform to secure organizations today and for an ever-changing future.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 3 | 730 | ||||
“ExtraHop turns the network - the enterprise’s ultimate source of truth - into actionable insight to power security, performance, and resilience.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 4 | 729 | ||||
“Claroty has redefined cyber-physical systems (CPS) protection with an unrivaled industry-centric platform built to secure mission-critical infrastructure.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 5 | 292 | ||||
“At Quorum Cyber, we're on a mission to help good people win.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 6 | 175 | ||||
“Prevalent AI is an AI-powered data fabric company, founded by GCHQ alumni, practitioners who spent their careers solving high-stakes intelligence problems in complex environments.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 7 | 96 | ||||
“CyberOne is a Microsoft Security Elite Partner and one of only 100 global Microsoft partners recognised with Microsoft-Verified Managed XDR solution status.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 8 | 96 | ||||
“Hunters is a Human-Driven, AI-Powered 'Next-Gen' SIEM that revolutionizes the way SOCs operate.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 9 | 95 | ||||
“For over 25 years, Cambridge-based Softwerx has redefined cybersecurity for midmarket organisations with its financially guaranteed 24×7x365 Managed XDR solutions.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 10 | 68 | ||||
“The organisations that run our world face relentless complexity and evolving threats.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 11 | 57 | ||||
“SentinelOne, an autonomous cybersecurity platform company, has completed the acquisition of Attivo Networks.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 12 | 52 | ||||
“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 2, 2026Thanks. The Data Team will review it. | |||||
| 13 | Adarma SecurityStrong evidence | 52 | |||
“We are Adarma, independent leaders in detection and response services.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 14 | 40 | ||||
“The all-in-one cyber security platform that grows with you.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 15 | 37 | ||||
“Syxsense is the leading provider of innovative, intuitive technology that sees all and knows everything about every endpoint, in every location, everywhere inside and outside the…” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 16 | 36 | ||||
“The future of IoT/OT security is here.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 17 | 34 | ||||
“Your business has a mobile blind spot.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 18 | 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 2, 2026Thanks. The Data Team will review it. | |||||
| 19 | 16 | ||||
“Huntsman Security is the creator of the Huntsman Security Analytics Platform that protects sensitive environments and critical national infrastructure in the Five Eyes community.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 20 | 16 | ||||
“Award-winning BlockAPT is redefining cybersecurity with an AI-powered, autonomous, self-defending platform built to protect modern digital ecosystems at speed and scale.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 21 | 8 | ||||
“Cyberseer offers Advanced Threat Detection and a 24×7 Managed Security Service (MSS).” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 22 | 7 | ||||
“Rebasoft is a UK based Software and Services company, founded in 2009 and produces software solutions for the Cyber Security market space.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 23 | 7 | ||||
“Making your Cyber Security Operations Scalable, Cost Effective and Efficient.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 24 | 7 | ||||
“Medicare Network is a niche, agile cybersecurity and risk management company offering a range of industry-leading and advanced solutions that combines human intelligence…” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 25 | 7 | ||||
“CounterShadow is redefining the cybersecurity landscape as the future of agentic cybersecurity.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 68 extended detection and response platforms based in the United Kingdom
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Extended detection and response platforms based in the United Kingdom at a glance
As of Sep 2, 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 extended detection and response platforms, 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 “extended detection and response platforms”. 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 extended detection and response platforms, 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, 5,710 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 2, 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.
Extended detection and response platforms by metro
- Extended detection and response platforms in London31
Frequently asked
How many extended detection and response platforms are there based in the United Kingdom?
RevenueBase identified 68 extended detection and response platforms 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 extended detection and response platforms?
London leads with 31 headquartered companies, followed by Cambridge (4) and Manchester (2).
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 5,710 verified decision-maker contacts tracked across these 68 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 2, 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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