Company lists · Data refreshed August 2026

Top 25 Big data security companies based in London, United Kingdom

Name: Big 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 Aug 30, 2026 58 companies tracked

RevenueBase identified 58 big data security companies headquartered in London, United Kingdom as of August 2026 and tracks 4,441 professional contacts across them, including 2,760 with verified work emails and 1,506 with mobile numbers. London is the largest hub.

This list covers big 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 August 30, 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 RevenueBase Smart Search rating on every row Refreshed Aug 30, 2026 86% judged on-target in blind review

58Companies

4,441Contacts tracked

2,760Verified emails

1,506Mobile numbers

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

Ranked by team size

Top 25 of 58 big data security companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Aug 30, 2026. RevenueBase Smart Search rates how each company's information relates to big 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	Sailpoint	Partial evidence	London, United Kingdom	1,001-5,000	3,059 contacts →
	Partial evidence “SailPoint equips the modern enterprise to seamlessly manage and secure access to applications and data through the lens of identity – at speed and scale.” Source: RevenueBase Database · checked Aug 30, 2026
2	Netwrix Corporation	Partial evidence	London, United Kingdom	501-1,000	799 contacts →
	Partial evidence “Netwrix secures the foundation of modern business: data and identity.” Source: RevenueBase Database · checked Aug 30, 2026
3	Futurex	Strong evidence	London, United Kingdom	51-200	147 contacts →
	Strong evidence “For over 40 years, Futurex has been an award-winning leader and innovator in the encryption market, delivering uncompromising enterprise-grade data security solutions.” Source: RevenueBase Database · checked Aug 30, 2026
4	Cryptomathic	Indirect evidence	London, United Kingdom	51-200	77 contacts →
	Indirect evidence “Cryptomathic helps businesses and governments to deliver trust and confidence in the digital world.” Source: RevenueBase Database · checked Aug 30, 2026
5	Garrison NOW A Part Of Everfox	Indirect evidence	London, United Kingdom	51-200	59 contacts →
	Indirect evidence “Garrison is a London-based cybersecurity company founded in 2014 by David Garfield (CEO) and Henry Harrison (Chief Scientist).” Source: RevenueBase Database · checked Aug 30, 2026
6	Hexegic	Partial evidence	London, United Kingdom	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 Aug 30, 2026
7	MPCH	Indirect evidence	London, United Kingdom	11-50	42 contacts →
	Indirect evidence “MPCH secures mission-critical systems through zero-trust key management and air-gapped recovery.” Source: RevenueBase Database · checked Aug 30, 2026
8	TES Enterprise Solutions	Partial evidence	London, United Kingdom	11-50	16 contacts →
	Partial evidence “EnterpriseTechnology.#Keep Data Safe.” Source: RevenueBase Database · checked Aug 30, 2026
9	Disclosure Cybersecurity	Partial evidence	London, United Kingdom	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 Aug 30, 2026
10	PC Power International LTD	Partial evidence	London, United Kingdom	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 Aug 30, 2026
11	Simplified Solutions	Partial evidence	London, United Kingdom	11-50	10 contacts →
	Partial evidence “Simplified Solutions protects organisation’s most valuable asset – Financial, Customer, Employee and Transactional Data.” Source: RevenueBase Database · checked Aug 30, 2026
12	Aiverz Technologies , Dubai & London, UK	Partial evidence	London, United Kingdom	11-50	10 contacts →
	Partial evidence “Aiverz Technologies is an Information Security Solutions provider specialize in helping businesses to deploy, improve and maintain stable and secure technology solutions.” Source: RevenueBase Database · checked Aug 30, 2026
13	Fusionexperience LTD	Partial evidence	London, United Kingdom	1-10	9 contacts →
	Partial evidence “FusionExperience Ltd was set up just over 15 years ago to provide innovative data solutions to its end customers.” Source: RevenueBase Database · checked Aug 30, 2026
14	Gospel Technology	Partial evidence	London, United Kingdom	11-50	7 contacts →
	Partial evidence “Gospel Technology was founded from the belief that the control, privacy and ownership of data will become one of the defining principles of the 21st century.” Source: RevenueBase Database · checked Aug 30, 2026
15	Vigil8 Partners Limited	Partial evidence	London, United Kingdom	1-10	6 contacts →
	Partial evidence “Your data is one of your most valuable, and most vulnerable, assets.” Source: RevenueBase Database · checked Aug 30, 2026
16	Strata	Indirect evidence	London, United Kingdom	1-10	5 contacts →
	Indirect evidence “Automate the boring.” Source: RevenueBase Database · checked Aug 30, 2026
17	DB Cybertech	Partial evidence	London, United Kingdom	51-200	5 contacts →
	Partial evidence “DB CyberTech innovates predictive data loss prevention for structured data.” Source: RevenueBase Database · checked Aug 30, 2026
18	Grove Group	Indirect evidence	London, United Kingdom	51-200	3 contacts →
	Indirect evidence “Grove unlocks business success by defending our customers with the most advanced cybersecurity solutions in the market place today.” Source: RevenueBase Database · checked Aug 30, 2026
19	Besecureonline	Partial evidence	London, United Kingdom	1-10	3 contacts →
	Partial evidence “BeSecureOnline is cloud-based cyber security company” Source: RevenueBase Database · checked Aug 30, 2026
20	Stryke	Partial evidence	London, United Kingdom	1-10	3 contacts →
	Partial evidence “With a dramatic shift in the way we now work and an increasingly sophisticated cyber landscape, digital security and resiliency has never been more important – protect critical…” Source: RevenueBase Database · checked Aug 30, 2026
21	Dark Taurus	Indirect evidence	London, United Kingdom	1-10	3 contacts →
	Indirect 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 Aug 30, 2026
22	DLP Assured	Indirect evidence	London, United Kingdom	51-200	2 contacts →
	Indirect evidence “DLP Assured work with enterprise customers to mitigate the threat from fraud on ecommerce systems, to mitigate the treat from insider attack and using leading edge technology to…” Source: RevenueBase Database · checked Aug 30, 2026
23	Checksec	Partial evidence	London, United Kingdom	1-10	2 contacts →
	Partial evidence “CheckSec is a UK based provider of security services and technologies, with a global focus.” Source: RevenueBase Database · checked Aug 30, 2026
24	Essential Security UK LTD	Partial evidence	London, United Kingdom	1-10	2 contacts →
	Partial evidence “Essential Security is a unique company in that we offer a specialised and confidential service meeting your bespoke technological and communications requirements.” Source: RevenueBase Database · checked Aug 30, 2026
25	soc.os	Indirect evidence	London, United Kingdom	11-50	1 contacts →
	Indirect evidence “SOC.OS has joined the Sophos family!” Source: RevenueBase Database · checked Aug 30, 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: big 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 big data security companies.
Partial evidence: Its own public description names part of big 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 big 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 58 big data security companies based in London, United Kingdom

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Big data security companies based in London, United Kingdom at a glance

As of Aug 30, 2026

62.1%Verified-email coverage

33.9%Mobile-number coverage

76.6Average contacts per company

1-10Median size (employees)

44.8%Largest-city concentration · London

Aug 30, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

1,001-5,000

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 big 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 “big 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 big 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 big 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, 2,760 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 August 30, 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.

Big data security companies by metro in the United Kingdom

Big data security companies in London26

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 big 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 big data security companies are there based in London, United Kingdom?

RevenueBase identified 58 big data security companies headquartered in London, United Kingdom as of August 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?

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

Which city has the most big data security companies?

London leads with 26 headquartered companies, followed by Milton Keynes (2) and Reading (1).

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 2,760 verified decision-maker contacts tracked across these 58 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 30, 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.