Company lists · Data refreshed September 2026
Top 25 Industrial control system security based in the United Kingdom
RevenueBase identified 139 industrial control system security headquartered in the United Kingdom as of September 2026 and tracks 3,349 professional contacts across them, including 1,188 with verified work emails and 315 with mobile numbers. London is the largest hub.
This list covers industrial control system security headquartered in the 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, how directly it supports the match, and when it was last checked. Data refreshed September 3, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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.
The 25 largest industrial control system security based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 304 | ||||
“Bridewell is the trusted cyber security partner for organisations operating within Critical National Infrastructure (CNI), as well as companies who want the highest standard of…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 2 | 165 | ||||
“Sapphire delivers comprehensive cyber solutions tailored to your needs, spanning across consultancy, managed services, IT/OT and beyond.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 3 | 129 | ||||
“KHIPU Networks is an award winning international Cyber Security Company delivering a wide range of network, wireless and security solutions, technologies and services across…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 4 | 89 | ||||
“Dedicated to securing the networks society depends on.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 5 | 80 | ||||
“At Reliance Cyber, we believe in truly partnering with our customers.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 6 | Adarma SecurityIndirect evidence | 52 | |||
“We are Adarma, independent leaders in detection and response services.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 7 | 38 | ||||
“Omerta - A Global Security Technology and Services Company.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 8 | 36 | ||||
“The future of IoT/OT security is here.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 9 | CyberisPartial evidence | 35 | |||
“Cyberis are pioneers in customer-focussed information security.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 10 | 33 | ||||
“We are your strategic cybersecurity partner – going beyond traditional models to deliver agile, expert-led protection tailored to the needs of regulated industries and critical…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 11 | Servelec ControlsStrong evidence | 33 | |||
“Servelec Controls develops and integrates bespoke mission-critical systems for national infrastructure by bringing together specialist hardware, software and world-class…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 12 | 32 | ||||
“Defense.com is transforming the way businesses manage cyber security by allowing them to easily identify, prioritise and remediate threats.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 13 | 26 | ||||
“Tekgem bridges the gap between Information Technology (IT) and Operational Technology (OT).” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 14 | 23 | ||||
“Blue Cube Security is a trusted UK cyber security partner with over 25 years of experience helping organisations stay secure in an increasingly complex digital world.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 15 | 22 | ||||
“IACS Consulting are an Aberdeen based Industrial Automation Control System consultancy that specialises exclusively in cyber security for the production and safety critical…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 16 | Templar ExecutivesPartial evidence | 21 | |||
“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: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 17 | Cyber EnergiaPartial evidence | 20 | |||
“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: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 18 | ClearswiftIndirect evidence | 19 | |||
“Why Clearswift?” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 19 | 17 | ||||
“Infosec K2K safeguards your organisation’s most valuable assets with tailored cybersecurity solutions.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 20 | CST Limited Computer Security TechnologyPartial evidence | 17 | |||
“We are a London based specialist supplier of cyber defence solution and information security services.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 21 | 16 | ||||
“CyberHive protects the most valued organisations, their people data, and assets, with patented technology that is simple, secure and performant.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 22 | OPTECIndirect evidence | 16 | |||
“We specialise in delivering end-to-end cybersecurity solutions and services designed to proactively protect your business.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 23 | 15 | ||||
“deltaflare is a technology company rooted in the Critical National Infrastructure.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 24 | 14 | ||||
“Who We Are DataSixth delivers Cybersecurity Intelligence.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 25 | 13 | ||||
“Xpertex has been at the cutting edge of cyber security development since 2006.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 139 industrial control system security based in the United Kingdom
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Industrial control system security based in the United Kingdom at a glance
As of Sep 3, 2026Companies by employee count
Verified emails by last verification
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, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United Kingdom whose own description of what they do matches “industrial control system security”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among industrial control system security, and records with no verified work email. Companies headquartered outside United Kingdom 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 an evidence 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, 1,188 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 3, 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.
Industrial control system security by metro
- Industrial control system security in London55
Frequently asked
How many industrial control system security are there based in the United Kingdom?
RevenueBase identified 139 industrial control system security headquartered in the 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?
Bridewell, headquartered in Edinburgh, tops this list with the largest team on record.
Which city has the most industrial control system security?
London leads with 55 headquartered companies, followed by Manchester (6) and Oxford (4).
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 1,188 verified decision-maker contacts tracked across these 139 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 3, 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 SmartSearch, 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.
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