Company lists · Data refreshed September 2026

Top 25 Data security companies based in London, United Kingdom

Name: Data security 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 10, 2026 168 companies tracked

RevenueBase identified 168 data security companies headquartered in London, United Kingdom as of September 2026 and tracks 2,403 professional contacts across them, including 461 with verified work emails and 197 with mobile numbers. London is the largest hub.

This list covers data security 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 10, 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 10, 2026 86% judged on-target in blind review

168Companies

2,403Contacts tracked

461Verified emails

197Mobile numbers

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

Ranked by team size

Top 25 of 168 data security companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 10, 2026. RevenueBase Smart Search rates how each company's information relates to data security 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	Obrela	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	201-500	242 contacts →
	Partial evidence “Obrela Security Industries is a global provider of cyber security services.” Source: RevenueBase Database · checked Sep 10, 2026
2	Bulletproof Cyber Security	Indirect evidence	London, United KingdomHQ checked Sep 10, 2026	51-200	123 contacts →
	Indirect evidence “Bulletproof is now part of WorkNest Secure.” Source: RevenueBase Database · checked Sep 10, 2026
3	Techforing	Indirect evidence	London, United KingdomHQ checked Sep 10, 2026	51-200	61 contacts →
	Indirect evidence “TechForing is a global leader in cybersecurity, dedicated to protecting digital assets and ensuring a safer cyberspace for businesses and individuals.” Source: RevenueBase Database · checked Sep 10, 2026
4	Daintta	Indirect evidence	London, United KingdomHQ checked Sep 10, 2026	51-200	60 contacts →
	Indirect evidence “We provide deep expertise with technical and business specialists to help clients secure and protect the UK.” Source: RevenueBase Database · checked Sep 10, 2026
5	Hexegic	Partial evidence	London, United KingdomHQ checked Sep 10, 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 10, 2026
6	Cyb3r	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	51-200	32 contacts →
	Partial evidence “CYB3R Group, is a leading provider of comprehensive Cyber Security, IT and Communications Solutions.” Source: RevenueBase Database · checked Sep 10, 2026
7	Privitar	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	51-200	30 contacts →
	Partial evidence “Privitar empowers organizations to use their data safely and ethically.” Source: RevenueBase Database · checked Sep 10, 2026
8	Smartsafe Consulting And Technology	Indirect evidence	London, United KingdomHQ checked Sep 10, 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 10, 2026
9	Nanjgel Solutions	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	51-200	24 contacts →
	Partial evidence “Nanjgel Solutions is focused on delivering the best IT security for businesses.” Source: RevenueBase Database · checked Sep 10, 2026
10	Secure Purple	Partial evidence	London, United KingdomHQ checked Sep 10, 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 10, 2026
11	Sinevis	Indirect evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	17 contacts →
	Indirect 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 10, 2026
12	Datasixth Consulting	Indirect evidence	London, United KingdomHQ checked Sep 10, 2026	51-200	15 contacts →
	Indirect evidence “Who We Are DataSixth delivers Cybersecurity Intelligence.” Source: RevenueBase Database · checked Sep 10, 2026
13	Netrascale	Indirect evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	15 contacts →
	Indirect evidence “At NetraScale, we help businesses navigate the ever-evolving cybersecurity landscape with confidence.” Source: RevenueBase Database · checked Sep 10, 2026
14	Everycloud AI & Data Security	Strong evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	14 contacts →
	Strong evidence “Demand more from your AI & Data Security partner.” Source: RevenueBase Database · checked Sep 10, 2026
15	Praeferre	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	13 contacts →
	Partial evidence “Praeferre is an AI-powered cybersecurity company, backed by SFC Capital, shaping the future of business security and compliance.” Source: RevenueBase Database · checked Sep 10, 2026
16	Socguardians LTD	Indirect evidence	London, United KingdomHQ checked Sep 10, 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 10, 2026
17	Disclosure Cybersecurity	Partial evidence	London, United KingdomHQ checked Sep 10, 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 10, 2026
18	PC Power International LTD	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	10 contacts →
	Partial evidence “PC POWER INTERNATIONAL LTD is a computer & network security company based in the City, London, United Kingdom.” Source: RevenueBase Database · checked Sep 10, 2026
19	Defenx	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	10 contacts →
	Partial evidence “Defenx is an IT company that has an extensive background in providing businesses with cloud based security solutions and support for their digital infrastructure.” Source: RevenueBase Database · checked Sep 10, 2026
20	Cyberseer	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	8 contacts →
	Partial evidence “Cyberseer offers Advanced Threat Detection and a 24×7 Managed Security Service (MSS).” Source: RevenueBase Database · checked Sep 10, 2026
21	Coc00n Cyber	Indirect evidence	London, United KingdomHQ checked Sep 10, 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 10, 2026
22	Threat Protect	Indirect evidence	London, United KingdomHQ checked Sep 10, 2026	1-10	7 contacts →
	Indirect 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 10, 2026
23	Vigil8 Partners Limited	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	1-10	6 contacts →
	Partial evidence “Your data is one of your most valuable, and most vulnerable, assets.” Source: RevenueBase Database · checked Sep 10, 2026
24	Bell ICT	Indirect evidence	London, United KingdomHQ checked Sep 10, 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 10, 2026
25	Rexel Cybersecurity	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	5 contacts →
	Partial evidence “At Rexel Cyber we help businesses fight the constant threat of cyber attack and data breach.” Source: RevenueBase Database · checked Sep 10, 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 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 companies.
Partial evidence: Its own public description names part of data security 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 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 168 data security companies based in London, United Kingdom

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

As of Sep 10, 2026

19.2%Verified-email coverage

8.2%Mobile-number coverage

14.3Average contacts per company

1-10Median size (employees)

74.4%Largest-city concentration · London

Sep 10, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 12.0d

4260–30

3231–60

161–90

190–180

1180+

Company record updated

Median 73.0d

00–30

77831–60

1,20761–90

30390–180

115180+

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 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 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 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 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, 461 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 10, 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.

Data security companies by metro in the United Kingdom

Data security companies in London125

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 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 companies are there based in London, United Kingdom?

RevenueBase identified 168 data security 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?

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

Which city has the most data security companies?

London leads with 125 headquartered companies, followed by Manchester (10) and Sheffield (5).

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 461 verified decision-maker contacts tracked across these 168 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 10, 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.