Company lists · Data refreshed September 2026

Top 25 Extended detection and response companies based in the United Kingdom

Name: Extended detection and response companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 328 companies tracked

RevenueBase identified 328 extended detection and response companies headquartered in the United Kingdom as of September 2026 and tracks 10,347 professional contacts across them, including 4,555 with verified work emails. London is the largest hub.

This list covers extended detection and response 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 September 20, 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 Sep 20, 2026 86% judged on-target in blind review

328Companies

10,347Contacts tracked

4,555Verified emails

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The 25 largest extended detection and response companies based in the United Kingdom

Ranked by team size

Top 25 of 328 extended detection and response companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to extended detection and response 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 Sep 20, 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 Sep 20, 2026
2	Securityhq	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	502 contacts →
	Indirect evidence “SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.” Source: RevenueBase Database · checked Sep 20, 2026
3	Obrela	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	242 contacts →
	Indirect evidence “Obrela Security Industries is a global provider of cyber security services.” Source: RevenueBase Database · checked Sep 20, 2026
4	Deepcytes Cyber Labs UK	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	177 contacts →
	Indirect evidence “Whether you’re a business or an individual, digital threats to your precious data and assets can come in any form - external or internal.” Source: RevenueBase Database · checked Sep 20, 2026
5	Cyberfort	Indirect evidence	Thatcham, United KingdomHQ checked Sep 20, 2026	51-200	159 contacts →
	Indirect 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 Sep 20, 2026
6	Khipu Networks	Indirect evidence	Fleet, United KingdomHQ checked Sep 20, 2026	51-200	125 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 20, 2026
7	Cyberone	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	96 contacts →
	Indirect evidence “CyberOne is a Microsoft Security Elite Partner and one of only 100 global Microsoft partners recognised with Microsoft-Verified Managed XDR solution status.” Source: RevenueBase Database · checked Sep 20, 2026
8	Sep2	Indirect evidence	Leeds, United KingdomHQ checked Sep 20, 2026	51-200	95 contacts →
	Indirect evidence “SEP2 is an award-winning UK-based cyber security specialist service provider, powered by a dedicated team of experts available 24/7/365.” Source: RevenueBase Database · checked Sep 20, 2026
9	Softwerx	Indirect evidence	Cambridge, United KingdomHQ checked Sep 20, 2026	51-200	88 contacts →
	Indirect evidence “For over 25 years, Cambridge-based Softwerx has redefined cybersecurity for midmarket organisations with its financially guaranteed 24×7x365 Managed XDR solutions.” Source: RevenueBase Database · checked Sep 20, 2026
10	ITC Secure	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	87 contacts →
	Indirect evidence “ITC Secure is an advisory-led cyber security services company.” Source: RevenueBase Database · checked Sep 20, 2026
11	Wavenet Cyberguard	Indirect evidence	Stourport-on-severn, United KingdomHQ checked Sep 20, 2026	201-500	86 contacts →
	Indirect evidence “CyberGuard Technologies is the security division of Wavenet.” Source: RevenueBase Database · checked Sep 20, 2026
12	Cybersmart	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	84 contacts →
	Indirect evidence “Cybersecurity should be simple.” Source: RevenueBase Database · checked Sep 20, 2026
13	Foregenix	Indirect evidence	Swindon, United KingdomHQ checked Sep 20, 2026	51-200	80 contacts →
	Indirect evidence “When your business relies on security, compliance and a strong reputation for taking care of your customers, you need a partner that understands your ethos, your challenges and…” Source: RevenueBase Database · checked Sep 20, 2026
14	Reliance Cyber	Indirect evidence	Waterloo, United KingdomHQ checked Sep 20, 2026	51-200	80 contacts →
	Indirect evidence “At Reliance Cyber, we believe in truly partnering with our customers.” Source: RevenueBase Database · checked Sep 20, 2026
15	Eset UK	Indirect evidence	Bournemouth, United KingdomHQ checked Sep 20, 2026	51-200	66 contacts →
	Indirect evidence “We help businesses and individuals stay protected in an increasingly complex digital world.” Source: RevenueBase Database · checked Sep 20, 2026
16	E2e-Assure	Strong evidence	Abingdon, United KingdomHQ checked Sep 20, 2026	51-200	61 contacts →
	Strong evidence “e2e-assure is the UK's leading specialist in Managed Threat Detection and Response through our 24/7/365 UK owned and operated Security Operations Centre (SOC).” Source: RevenueBase Database · checked Sep 20, 2026
17	Hexegic	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	52 contacts →
	Indirect evidence “At Hexegic we are not just passionate about protecting data through our Cyber services we are passionate about helping companies release the potential of the data they hold…” Source: RevenueBase Database · checked Sep 20, 2026
18	Redscan, A Kroll Business	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	51 contacts →
	Strong evidence “Redscan is an award-winning provider of managed security services, specialising in Managed Detection and Response, Penetration Testing and Red Teaming.” Source: RevenueBase Database · checked Sep 20, 2026
19	Adarma Security	Strong evidence	Edinburgh, United KingdomHQ checked Sep 20, 2026	201-500	51 contacts →
	Strong evidence “We are Adarma, independent leaders in detection and response services.” Source: RevenueBase Database · checked Sep 20, 2026
20	Satisnet, A Gamma Company	Indirect evidence	Luton, United KingdomHQ checked Sep 20, 2026	51-200	45 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 20, 2026
21	Cyberq Group	Indirect evidence	Birmingham, United KingdomHQ checked Sep 20, 2026	51-200	42 contacts →
	Indirect evidence “CyberQ Group is an award-winning, venture-backed, and globally accredited [ISO27K and CREST] cybersecurity leader dedicated to bridging the "protection gap" for high-stakes…” Source: RevenueBase Database · checked Sep 20, 2026
22	Cysiam	Strong evidence	Milton Keynes, United KingdomHQ checked Sep 20, 2026	11-50	42 contacts →
	Strong evidence “CYSIAM® provides an entirely UK-based and threat-led 24/7 Managed Detection and Response (MDR) service.” Source: RevenueBase Database · checked Sep 20, 2026
23	Coretech Security	Indirect evidence	Cheltenham, United KingdomHQ checked Sep 20, 2026	51-200	42 contacts →
	Indirect evidence “CoreTech is a specialist cyber security company whose people are motivated by the desire to deliver exceptional capabilities coupled with a real sense of mission.” Source: RevenueBase Database · checked Sep 20, 2026
24	Cybaverse	Indirect evidence	Portsmouth, United KingdomHQ checked Sep 20, 2026	51-200	41 contacts →
	Indirect evidence “We are on a mission to simplify and scale cyber security by combining AI, automation, expert-led services, in a unified platform: giving every organisation, from MSPs to global…” Source: RevenueBase Database · checked Sep 20, 2026
25	Core To Cloud	Indirect evidence	Cirencester, United KingdomHQ checked Sep 20, 2026	11-50	39 contacts →
	Indirect evidence “We help organisations understand, optimise, and strengthen their cybersecurity.” Source: RevenueBase Database · checked Sep 20, 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: extended detection and response 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 extended detection and response companies.
Partial evidence: Its own public description names part of extended detection and response companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name extended detection and response 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 328 extended detection and response companies based in the United Kingdom

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Extended detection and response companies based in the United Kingdom at a glance

As of Sep 20, 2026

44.0%Verified-email coverage

31.5Average contacts per company

11-50Median size (employees)

40.9%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

163

11-50

107

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 328 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 extended detection and response 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 “extended detection and response 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 extended detection and response 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 extended detection and response 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, 4,555 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 20, 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 companies by metro

Extended detection and response companies in London134

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 extended detection and response 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 extended detection and response companies are there based in the United Kingdom?

RevenueBase identified 328 extended detection and response 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 extended detection and response companies?

London leads with 134 headquartered companies, followed by Manchester (17) and Birmingham (7).

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 4,555 verified decision-maker contacts tracked across these 328 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 20, 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.