Company lists · Data refreshed September 2026

Top 24 Cybersecurity incident investigation companies based in London, United Kingdom

Name: Cybersecurity incident investigation companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 74 companies tracked

RevenueBase identified 74 cybersecurity incident investigation companies headquartered in London, United Kingdom as of September 2026 and tracks 1,679 professional contacts across them, including 131 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers cybersecurity incident investigation companies headquartered in London, 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 28, 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 28, 2026 86% judged on-target in blind review

74Companies

1,679Contacts tracked

131Verified emails

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The 24 largest cybersecurity incident investigation companies based in London, United Kingdom

Ranked by team size

Top 24 of 74 cybersecurity incident investigation companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to cybersecurity incident investigation 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	Deepcytes Cyber Labs UK	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
2	Hexegic	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
3	CYJAX	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	29 contacts →
	Indirect evidence “CYJAX is an award-winning technology company and provider of digital threat intelligence services to international corporations, law enforcement agencies and the public sector.” Source: RevenueBase Database · checked Sep 28, 2026
4	Templar Executives	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	21 contacts →
	Indirect evidence “Templar Executives is an award winning, international Cyber Security advisory services and solutions company operating at the highest levels across the public and private sectors.” Source: RevenueBase Database · checked Sep 28, 2026
5	Secure Purple	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	20 contacts →
	Indirect evidence “Secure Purple is a leading cyber security and digital safety firm that provides innovative solutions and services to help organisations and individuals stay protected in the…” Source: RevenueBase Database · checked Sep 28, 2026
6	th4ts3cur1ty.company	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	18 contacts →
	Indirect evidence “th4ts3cur1ty.company supplies cyber security services internationally.” Source: RevenueBase Database · checked Sep 28, 2026
7	Cyber Armed Security	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	12 contacts →
	Indirect evidence “At Cyber Armed Security, we protect organisations worldwide from evolving cyber threats through intelligence-driven ethical hacking.” Source: RevenueBase Database · checked Sep 28, 2026
8	Asceris	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	11 contacts →
	Strong 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 28, 2026
9	Disclosure Cybersecurity	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	11 contacts →
	Partial evidence “Disclosure Cybersecurity Ltd is a specialist cyber security company, formed by professionals with extensive experience and wide exposure in the cyber security market.” Source: RevenueBase Database · checked Sep 28, 2026
10	First Response	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	11 contacts →
	Strong 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 28, 2026
11	Secureteam LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	10 contacts →
	Partial evidence “SecureTeam are a UK-based information security practice, specialising in all areas of cybersecurity.” Source: RevenueBase Database · checked Sep 28, 2026
12	Priam Cyber AI	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	7 contacts →
	Indirect evidence “Priam Cyber AI builds AVA (Advanced Virtual Analyst), an AI SOC platform that investigates alerts the way an analyst would.” Source: RevenueBase Database · checked Sep 28, 2026
13	Rexel Cybersecurity	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	5 contacts →
	Indirect evidence “At Rexel Cyber we help businesses fight the constant threat of cyber attack and data breach.” Source: RevenueBase Database · checked Sep 28, 2026
14	Forensic Control	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	4 contacts →
	Indirect evidence “Forensic Control is a London-based cyber security consultancy, founded in 2008 and an authorised IASME Cyber Essentials Certification Body.” Source: RevenueBase Database · checked Sep 28, 2026
15	Grove Group	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	3 contacts →
	Partial evidence “Grove unlocks business success by defending our customers with the most advanced cybersecurity solutions in the market place today.” Source: RevenueBase Database · checked Sep 28, 2026
16	4n6	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	3 contacts →
	Strong evidence “Provides IT services including cybersecurity, advanced troubleshooting and diagnostics, post-incident reviews and digital forensics.” Source: RevenueBase Database · checked Sep 28, 2026
17	Threatproof	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	2 contacts →
	Partial evidence “At Threatproof, our mission is to redefine cybersecurity for businesses of all sizes.” Source: RevenueBase Database · checked Sep 28, 2026
18	Outbreach	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	2 contacts →
	Indirect evidence “As a specialist cyber response service, we are experts in our field, trusted when it really matters.” Source: RevenueBase Database · checked Sep 28, 2026
19	Cansol Consulting	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	2 contacts →
	Indirect evidence “Founded in 2017, Cansol is a Cyber Security company with office in London and Dubai.” Source: RevenueBase Database · checked Sep 28, 2026
20	TPCS	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	2 contacts →
	Indirect evidence “Third Party Cyber Security (TPCS) are experts in protecting your return on investments from hidden cyber risks.” Source: RevenueBase Database · checked Sep 28, 2026
21	Netscylla Cyber Security LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	2 contacts →
	Partial evidence “Netscylla Cyber Security is a small start-up providing cyber security expertise, specialising in cyber security, offensive security, incident response and consultancy.” Source: RevenueBase Database · checked Sep 28, 2026
22	Tendo Solutions	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	2 contacts →
	Partial evidence “Tendo Solutions is an intelligence-based security company, specialising in corporate due diligence, investigations, research and risk analysis, forensics, horizon scanning and…” Source: RevenueBase Database · checked Sep 28, 2026
23	Cyberalert	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	1 contacts →
	Partial evidence “We are Cyber Alert, in partnership with Cyber Hadrian, and we’re transforming cybersecurity.” Source: RevenueBase Database · checked Sep 28, 2026
24	WESDX	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	1 contacts →
	Strong evidence “Offering independent cyber, incident response, and digital investigations to a wide client base.” Source: RevenueBase Database · checked Sep 28, 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: cybersecurity incident investigation 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 cybersecurity incident investigation companies.
Partial evidence: Its own public description names part of cybersecurity incident investigation companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity incident investigation 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 24 of 74 cybersecurity incident investigation companies based in London, United Kingdom

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Cybersecurity incident investigation companies based in London, United Kingdom at a glance

As of Sep 28, 2026

7.8%Verified-email coverage

22.7Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 74 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 cybersecurity incident investigation 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 London, United Kingdom whose own description of what they do matches “cybersecurity incident investigation 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 cybersecurity incident investigation 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 cybersecurity incident investigation companies, and records with no verified work email. Companies headquartered outside London 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, 131 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 28, 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.

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 cybersecurity incident investigation 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 cybersecurity incident investigation companies are there based in London, United Kingdom?

RevenueBase identified 74 cybersecurity incident investigation companies headquartered in London, 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?

Deepcytes Cyber Labs UK, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most cybersecurity incident investigation companies?

London leads the United Kingdom with 74 headquartered companies, followed by Manchester (8) and Cheltenham (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 131 verified decision-maker contacts tracked across these 74 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 28, 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.