Company lists · Data refreshed September 2026

Top 25 Industrial control system security firms based in London, United Kingdom

Name: Industrial control system security 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 113 companies tracked

RevenueBase identified 113 industrial control system security firms headquartered in London, United Kingdom as of September 2026 and tracks 2,004 professional contacts across them, including 404 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers industrial control system security 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

113Companies

2,004Contacts tracked

404Verified emails

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The 25 largest industrial control system security firms based in London, United Kingdom

Ranked by team size

Top 25 of 113 industrial control system security 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 industrial control system security 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	Obrela	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	242 contacts →
	Strong evidence “Obrela Security Industries is a global provider of cyber security services.” Source: RevenueBase Database · checked Sep 28, 2026
2	Cyberowl	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	52 contacts →
	Strong evidence “CyberOwl helps asset operators in the maritime and critical national infrastructure sectors gain visibility, cyber security and cyber compliance of systems on their distributed…” 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	Toro Solutions	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	23 contacts →
	Partial 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
5	Templar Executives	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	21 contacts →
	Partial 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
6	Cyber Energia	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	20 contacts →
	Partial evidence “Cyber Energia – Your Comprehensive Cyber Security Solution for a smart & sustainable energy market Cyber Energia is a dynamic managed security service provider offering OT / SCADA…” Source: RevenueBase Database · checked Sep 28, 2026
7	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
8	th4ts3cur1ty.company	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	18 contacts →
	Partial evidence “th4ts3cur1ty.company supplies cyber security services internationally.” Source: RevenueBase Database · checked Sep 28, 2026
9	Infosec K2k	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	18 contacts →
	Indirect evidence “Infosec K2K safeguards your organisation’s most valuable assets with tailored cybersecurity solutions.” Source: RevenueBase Database · checked Sep 28, 2026
10	Sinevis	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 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	Definitive Security Solutions LTD	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	13 contacts →
	Strong evidence “Definitive Security Solutions are an established designer, installer and maintainer of security, CCTV, intruder alarms, access control, power and data, and fire detection systems.” Source: RevenueBase Database · checked Sep 28, 2026
13	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
14	Deltaflare	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	12 contacts →
	Indirect evidence “deltaflare helps critical infrastructure operators modernise securely.” Source: RevenueBase Database · checked Sep 28, 2026
15	First Response	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	11 contacts →
	Indirect 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
16	Cyberprism	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	11 contacts →
	Indirect evidence “CyberPrism safeguards your business-critical Operational Technology (OT).” Source: RevenueBase Database · checked Sep 28, 2026
17	Otifyd	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	11 contacts →
	Partial evidence “We are a next-gen Operational Technology (OT) cybersecurity leader focused on safeguarding industrial environments so that we can fulfil our purpose: Provide best-in-class OT…” Source: RevenueBase Database · checked Sep 28, 2026
18	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
19	Icyberdefence	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	8 contacts →
	Partial evidence “iCyberDefence is a boutique cybersecurity services firm that offers a wide range of security consulting and security engineering services with the necessary products and tools.” Source: RevenueBase Database · checked Sep 28, 2026
20	Microsoft Azure Community	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	8 contacts →
	Indirect evidence “Community of Azure users.” Source: RevenueBase Database · checked Sep 28, 2026
21	Threat Protect	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
22	Ansador Fire & Security	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	6 contacts →
	Partial evidence “Ansador Ltd has been privately owned since it was founded in 1982, providing system solutions to corporate and global clients across EMEA.” Source: RevenueBase Database · checked Sep 28, 2026
23	Sorair Technologies	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	5 contacts →
	Strong evidence “Providing autonomous surveillance systems for industrial companies, and national security entities.” Source: RevenueBase Database · checked Sep 28, 2026
24	Amovada	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	5 contacts →
	Indirect evidence “Amovada is a leading consultancy specialising in Operational Technology (OT) Cybersecurity for global manufacturing companies.” Source: RevenueBase Database · checked Sep 28, 2026
25	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

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: industrial control system security 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 industrial control system security firms.
Partial evidence: Its own public description names part of industrial control system security firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name industrial control system security 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 113 industrial control system security firms based in London, United Kingdom

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Industrial control system security firms based in London, United Kingdom at a glance

As of Sep 28, 2026

20.2%Verified-email coverage

17.7Average contacts per company

11-50Median 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 113 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 industrial control system security 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 “industrial control system security 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 industrial control system security 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 industrial control system security 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, 404 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 industrial control system security 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 industrial control system security firms are there based in London, United Kingdom?

RevenueBase identified 113 industrial control system security 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?

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

Which city in the United Kingdom has the most industrial control system security firms?

London leads the United Kingdom with 113 headquartered companies, followed by Manchester (10) and Birmingham (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 404 verified decision-maker contacts tracked across these 113 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.