Company lists · Data refreshed September 2026

Top 25 Healthcare cybersecurity firms based in London, United Kingdom

Name: Healthcare cybersecurity firms 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 131 companies tracked

RevenueBase identified 131 healthcare cybersecurity firms headquartered in London, United Kingdom as of September 2026 and tracks 2,476 professional contacts across them, including 308 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers healthcare cybersecurity firms 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

131Companies

2,476Contacts tracked

308Verified emails

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The 25 largest healthcare cybersecurity firms based in London, United Kingdom

Ranked by team size

Top 25 of 131 healthcare cybersecurity firms 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 healthcare cybersecurity firms: 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	Bulletproof Cyber Security	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	123 contacts →
	Indirect evidence “Bulletproof is now part of WorkNest Secure.” Source: RevenueBase Database · checked Sep 28, 2026
2	Cybersmart	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	84 contacts →
	Partial evidence “Cybersecurity should be simple.” Source: RevenueBase Database · checked Sep 28, 2026
3	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
4	Encode	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	25 contacts →
	Indirect evidence “Encode is now part of Obrela Security Industries collectively delivering cutting edge Cyber Security Services, empowering organizations to better protect against cyber threats.” Source: RevenueBase Database · checked Sep 28, 2026
5	CYPRO	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	21 contacts →
	Indirect evidence “Secure.” Source: RevenueBase Database · checked Sep 28, 2026
6	Sinevis	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	17 contacts →
	Partial evidence “We are a leading cybersecurity services organization with more than a decade of proven expertise in consulting, solution implementation and managed services.” Source: RevenueBase Database · checked Sep 28, 2026
7	Datasixth Consulting	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	15 contacts →
	Partial evidence “Who We Are DataSixth delivers Cybersecurity Intelligence.” Source: RevenueBase Database · checked Sep 28, 2026
8	The ZDL Group Limited	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	13 contacts →
	Indirect evidence “Delivering Excellence in Cyber Security At ZDL, we believe that effective risk management requires a holistic 360° approach.” Source: RevenueBase Database · checked Sep 28, 2026
9	Goallsecure	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	13 contacts →
	Indirect evidence “In today’s world, cyber threats are complex and multilayered, so complete protection is not achievable through a single solution or product, that's why GoAllSecure provides a 360°…” Source: RevenueBase Database · checked Sep 28, 2026
10	Socguardians LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	13 contacts →
	Partial 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
11	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
12	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
13	Coc00n Cyber	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	8 contacts →
	Indirect evidence “coc00n secures the personal devices of high-value and high-interest individuals against cyber attacks.” Source: RevenueBase Database · checked Sep 28, 2026
14	Kloudwerk	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	7 contacts →
	Indirect evidence “Kloudwerk offers a game-changing approach to cyber security consulting for SMEs.” Source: RevenueBase Database · checked Sep 28, 2026
15	Medicare Network	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	7 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 28, 2026
16	Threat Protect	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	7 contacts →
	Partial evidence “Threat Protect is a vendor-agnostic cybersecurity, compliance and AI governance partner based in London, working with organisations across finance, legal, energy, pharma…” Source: RevenueBase Database · checked Sep 28, 2026
17	Strata	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	5 contacts →
	Indirect evidence “Automate the boring.” Source: RevenueBase Database · checked Sep 28, 2026
18	Bell ICT	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	5 contacts →
	Indirect evidence “From the little niggles to the large networks It’s the little things that are vital whether you have a website, online accounts or any type of web-based infrastructure.” Source: RevenueBase Database · checked Sep 28, 2026
19	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
20	River Oakfield	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	4 contacts →
	Indirect evidence “River Oakfield is a global cyber security firm which provides tailored solutions to individuals, business leaders and enterprise clients.” Source: RevenueBase Database · checked Sep 28, 2026
21	Cynance	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	4 contacts →
	Partial evidence “Cynance is a business-driven cybersecurity and data protection consulting and Cyber tech reselling firm, trusted by organizations across the UK, EU, and worldwide.” Source: RevenueBase Database · checked Sep 28, 2026
22	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
23	Dark Taurus	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	3 contacts →
	Partial evidence “Dark Taurus are an innovative UK based Cybersecurity Solutions and Advisory company at the forefront of Risk Prevention and Risk Management.” Source: RevenueBase Database · checked Sep 28, 2026
24	Cybersecure365	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	3 contacts →
	Indirect evidence “CyberSecure365™ offers an enterprising new approach to your company’s cyber security.” Source: RevenueBase Database · checked Sep 28, 2026
25	Steeple Cyber	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	3 contacts →
	Partial evidence “We are an independent Cyber and IT Consultancy specialising in Healthcare.” 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: healthcare cybersecurity firms. 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 healthcare cybersecurity firms.
Partial evidence: Its own public description names part of healthcare cybersecurity firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name healthcare cybersecurity firms. 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 131 healthcare cybersecurity firms based in London, United Kingdom

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Healthcare cybersecurity firms based in London, United Kingdom at a glance

As of Sep 28, 2026

12.4%Verified-email coverage

18.9Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

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 131 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 healthcare cybersecurity firms, 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 “healthcare cybersecurity firms”. 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 healthcare cybersecurity firms), 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 healthcare cybersecurity firms, 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, 308 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 healthcare cybersecurity firms, 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 healthcare cybersecurity firms are there based in London, United Kingdom?

RevenueBase identified 131 healthcare cybersecurity firms 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?

Bulletproof Cyber Security, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most healthcare cybersecurity firms?

London leads the United Kingdom with 131 headquartered companies, followed by Cheltenham (9) and Manchester (8).

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 308 verified decision-maker contacts tracked across these 131 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.