Company lists · Data refreshed September 2026

Top 25 Breach detection services based in the United Kingdom

Name: Breach detection services based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 162 companies tracked

RevenueBase identified 162 breach detection services headquartered in the United Kingdom as of September 2026 and tracks 6,833 professional contacts across them, including 3,368 with verified work emails. London is the largest hub.

This list covers breach detection services 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 19, 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 19, 2026 86% judged on-target in blind review

162Companies

6,833Contacts tracked

3,368Verified emails

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The 25 largest breach detection services based in the United Kingdom

Ranked by team size

Top 25 of 162 breach detection services based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to breach detection services: 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 19, 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 19, 2026
2	Obrela	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	242 contacts →
	Indirect evidence “Obrela Security Industries is a global provider of cyber security services.” Source: RevenueBase Database · checked Sep 19, 2026
3	Deepcytes Cyber Labs UK	Indirect evidence	London, United KingdomHQ checked Sep 19, 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 19, 2026
4	Wavenet Cyberguard	Indirect evidence	Stourport-on-severn, United KingdomHQ checked Sep 19, 2026	201-500	86 contacts →
	Indirect evidence “CyberGuard Technologies is the security division of Wavenet.” Source: RevenueBase Database · checked Sep 19, 2026
5	Cybersmart	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	84 contacts →
	Indirect evidence “Cybersecurity should be simple.” Source: RevenueBase Database · checked Sep 19, 2026
6	Foregenix	Indirect evidence	Swindon, United KingdomHQ checked Sep 19, 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 19, 2026
7	Hexegic	Indirect evidence	London, United KingdomHQ checked Sep 19, 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 19, 2026
8	Redscan, A Kroll Business	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	51 contacts →
	Partial 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 19, 2026
9	Adarma Security	Partial evidence	Edinburgh, United KingdomHQ checked Sep 19, 2026	201-500	51 contacts →
	Partial evidence “We are Adarma, independent leaders in detection and response services.” Source: RevenueBase Database · checked Sep 19, 2026
10	Cyberq Group	Indirect evidence	Birmingham, United KingdomHQ checked Sep 19, 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 19, 2026
11	Cybaverse	Indirect evidence	Portsmouth, United KingdomHQ checked Sep 19, 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 19, 2026
12	Core To Cloud	Indirect evidence	Cirencester, United KingdomHQ checked Sep 19, 2026	11-50	39 contacts →
	Indirect evidence “We help organisations understand, optimise, and strengthen their cybersecurity.” Source: RevenueBase Database · checked Sep 19, 2026
13	Secarma LTD	Indirect evidence	Manchester, United KingdomHQ checked Sep 19, 2026	11-50	36 contacts →
	Indirect evidence “Secarma exists to keep the world safe.” Source: RevenueBase Database · checked Sep 19, 2026
14	defense.com	Indirect evidence	Stevenage, United KingdomHQ checked Sep 19, 2026	51-200	32 contacts →
	Indirect 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 Sep 19, 2026
15	Intrinsic Security	Partial evidence	Peterborough, United KingdomHQ checked Sep 19, 2026	51-200	32 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 19, 2026
16	AMR Cybersecurity	Indirect evidence	Cheltenham, United KingdomHQ checked Sep 19, 2026	11-50	23 contacts →
	Indirect 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 Sep 19, 2026
17	Ecsc Part Of The Wavenet Group	Indirect evidence	Bradford, United KingdomHQ checked Sep 19, 2026	51-200	23 contacts →
	Indirect evidence “22 June 2023 – Daisy Corporate Services announced the acquisition of cyber security service provider, ECSC Group plc.” Source: RevenueBase Database · checked Sep 19, 2026
18	Blue Cube Security LTD	Indirect evidence	East Grinstead, United KingdomHQ checked Sep 19, 2026	11-50	22 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 19, 2026
19	3b Data Security	Partial evidence	Cambridge, United KingdomHQ checked Sep 19, 2026	11-50	21 contacts →
	Partial evidence “Digital Forensics, Incident Response & Data Breach Management Services 3B Data Security is an approved PCI SSC PCI Forensic Investigator (PFI) and Qualified Security Assessor…” Source: RevenueBase Database · checked Sep 19, 2026
20	Lrqa Nettitude	Indirect evidence	Birmingham, United KingdomHQ checked Sep 19, 2026	201-500	15 contacts →
	Indirect evidence “Best penetration testing service - Teiss Awards 2024 Managed cloud service winner - Stratus Awards 2023 Security vendor of the year - Computing security excellence awards 2023…” Source: RevenueBase Database · checked Sep 19, 2026
21	Datasixth Consulting	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	15 contacts →
	Indirect evidence “Who We Are DataSixth delivers Cybersecurity Intelligence.” Source: RevenueBase Database · checked Sep 19, 2026
22	Socguardians LTD	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	13 contacts →
	Indirect evidence “Our mission at SOCGuardians is to empower organizations to operate confidently in a digital world by providing cutting-edge cybersecurity services.” Source: RevenueBase Database · checked Sep 19, 2026
23	Asceris	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	11 contacts →
	Indirect evidence “From our diverse backgrounds in cyber incident response, forensic investigations, automation, data science and cyber insurance, we have a unique perspective on how to improve…” Source: RevenueBase Database · checked Sep 19, 2026
24	Data Connect Group	Indirect evidence	Harrogate, United KingdomHQ checked Sep 19, 2026	11-50	11 contacts →
	Indirect evidence “Data Connect Group provides continuous "real-world" cyber risk assurance.” Source: RevenueBase Database · checked Sep 19, 2026
25	First Response	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	11 contacts →
	Indirect evidence “First Response is a London based specialist cybersecurity, cyber incident response and digital investigation company that helps organisations navigate the complex issues…” Source: RevenueBase Database · checked Sep 19, 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: breach detection services. 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 breach detection services.
Partial evidence: Its own public description names part of breach detection services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name breach detection services. 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 162 breach detection services based in the United Kingdom

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Breach detection services based in the United Kingdom at a glance

As of Sep 19, 2026

49.3%Verified-email coverage

42.2Average contacts per company

11-50Median size (employees)

37.7%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

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 162 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 breach detection services, 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 “breach detection services”. 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 breach detection services), 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 breach detection services, 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, 3,368 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 19, 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.

Breach detection services by metro

Breach detection services in London61

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 breach detection services, 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 breach detection services are there based in the United Kingdom?

RevenueBase identified 162 breach detection services 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 breach detection services?

London leads with 61 headquartered companies, followed by Birmingham (6) and Manchester (6).

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 3,368 verified decision-maker contacts tracked across these 162 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 19, 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.