Company lists · Data refreshed September 2026

Top 25 Data security assessment companies based in London, United Kingdom

Name: Data security assessment 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 154 companies tracked

RevenueBase identified 154 data security assessment companies headquartered in London, United Kingdom as of September 2026 and tracks 2,582 professional contacts across them, including 278 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers data security assessment 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

154Companies

2,582Contacts tracked

278Verified emails

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The 25 largest data security assessment companies based in London, United Kingdom

Ranked by team size

Top 25 of 154 data security assessment 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 data security assessment 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	COBRA	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	n/a	705 contacts →
	Strong evidence “Get a free, powerful security assessment with personalised recommendations, the same analysis that costs from IT Consultancies.” Source: RevenueBase Database · checked Sep 28, 2026
2	Trpglobal	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	126 contacts →
	Indirect evidence “We are TRPGLOBAL, your strategic partner in helping you with the complexities of risk management.” Source: RevenueBase Database · checked Sep 28, 2026
3	Hexegic	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	52 contacts →
	Partial 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
4	Privitar	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	30 contacts →
	Partial evidence “Privitar empowers organizations to use their data safely and ethically.” Source: RevenueBase Database · checked Sep 28, 2026
5	Smartsafe Consulting And Technology	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	26 contacts →
	Indirect evidence “Our overarching aim is to safeguard your information so that you can focus on taking your business where you want it to go.” Source: RevenueBase Database · checked Sep 28, 2026
6	Toro Solutions	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	23 contacts →
	Indirect evidence “Toro was founded on creating the UK's first Red Team penetration test - and then attacking hundreds of clients by hacking their systems, influencing / social engineering staff and…” Source: RevenueBase Database · checked Sep 28, 2026
7	Kiris Group	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	22 contacts →
	Partial evidence “Our Chartered Security Professionals seamlessly integrate discreet and effective security into lifestyles and organisations.” Source: RevenueBase Database · checked Sep 28, 2026
8	LMS Security	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	20 contacts →
	Partial evidence “LMS Security are a fully Independent, privately owned, Internationally recognised and accredited Security Consultancy; owned and built by Electronic and Physical Security…” Source: RevenueBase Database · checked Sep 28, 2026
9	Secure Purple	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	20 contacts →
	Partial 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
10	Cyber Tzar	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	17 contacts →
	Strong evidence “Cyber Security Assessment, Score Carding, Benchmarking, and Risk Management Platform.” Source: RevenueBase Database · checked Sep 28, 2026
11	Datasixth Consulting	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	15 contacts →
	Indirect evidence “Who We Are DataSixth delivers Cybersecurity Intelligence.” Source: RevenueBase Database · checked Sep 28, 2026
12	Eh1-Infotech Cybersecurity	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	15 contacts →
	Partial evidence “is an ISO 9001:2015 and ISO/IEC 27001:2022 certified, DPIIT-recognized cybersecurity company delivering structured External Vulnerability Assessment & Penetration Testing (VAPT)…” Source: RevenueBase Database · checked Sep 28, 2026
13	Everycloud AI & Data Security	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	14 contacts →
	Strong evidence “Demand more from your AI & Data Security partner.” Source: RevenueBase Database · checked Sep 28, 2026
14	Risk Crew	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	14 contacts →
	Indirect evidence “Risk Crew is known for their vision, innovative thinking and facility to embrace change.” Source: RevenueBase Database · checked Sep 28, 2026
15	Socguardians LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
16	Cyber Armed Security	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	12 contacts →
	Partial 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
17	Crmg Cyber Risk Management Group	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	11 contacts →
	Partial evidence “Cyber Risk Management Group is a leading provider of cyber security and information risk services.” Source: RevenueBase Database · checked Sep 28, 2026
18	1 Cyber Valley	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	11 contacts →
	Partial evidence “1 Cyber Valley is a PCI DSS–approved Qualified Security Assessor (QSA) and PCI PIN Assessor (QPA), delivering compliance and assurance services to clients in more than 120…” Source: RevenueBase Database · checked Sep 28, 2026
19	2-Sec	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	11 contacts →
	Partial evidence “At 2\|SEC Consulting, we deliver an end-to-end service of cyber and information security solutions which are tailored to each client’s exact security needs.” Source: RevenueBase Database · checked Sep 28, 2026
20	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
21	Locked Stack	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	8 contacts →
	Indirect evidence “Locked Stack is an independent cybersecurity consultancy and managed services firm headquartered in London, with a US subsidiary, operating across North America, Europe, and the…” Source: RevenueBase Database · checked Sep 28, 2026
22	Stratia Cyber	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	8 contacts →
	Partial evidence “Stratia Cyber is an independent, technology agnostic company providing high quality, pragmatic cyber security consultancy and expertise, is a founder member of the NCSC Certified…” Source: RevenueBase Database · checked Sep 28, 2026
23	Assured Clarity Limited	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	7 contacts →
	Strong evidence “We are a global consultancy firm that specializes in Digital Risk Management and Data Privacy/Data Protection, while also ensuring robust Cyber Security measures for our clients.” Source: RevenueBase Database · checked Sep 28, 2026
24	Cortida	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	7 contacts →
	Partial evidence “Through excellent consultancy we protect clients from reputation damage, financial penalties and the operational disruption associated with data incidents and cyberattacks.” Source: RevenueBase Database · checked Sep 28, 2026
25	Kloudwerk	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	7 contacts →
	Partial evidence “Kloudwerk offers a game-changing approach to cyber security consulting for SMEs.” 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: data security assessment 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 data security assessment companies.
Partial evidence: Its own public description names part of data security assessment companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name data security assessment 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 154 data security assessment companies based in London, United Kingdom

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Data security assessment companies based in London, United Kingdom at a glance

As of Sep 28, 2026

10.8%Verified-email coverage

16.8Average 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

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 154 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 data security assessment 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 “data security assessment 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 data security assessment 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 data security assessment 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, 278 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 data security assessment 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 data security assessment companies are there based in London, United Kingdom?

RevenueBase identified 154 data security assessment 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?

COBRA, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most data security assessment companies?

London leads the United Kingdom with 154 headquartered companies, followed by Manchester (18) and Birmingham (13).

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 278 verified decision-maker contacts tracked across these 154 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.