Company lists · Data refreshed September 2026

Top 25 Operational technology security companies based in the United Kingdom

Name: Operational technology security companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 96 companies tracked

RevenueBase identified 96 company matches for operational technology security companies associated with the United Kingdom as of September 2026 and tracks 2,262 professional contacts across them, including 722 with verified work emails and 447 with mobile numbers. London is the largest hub.

This list covers company matches for operational technology security companies associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 5, 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.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 5, 2026 How this list was built

96Companies

2,262Contacts tracked

722Verified emails

447Mobile numbers

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The 25 largest operational technology security companies based in the United Kingdom

Ranked by team size

Top 25 of 96 company matches for operational technology security companies based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 5, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Bridewell	Exact match	Reading, United KingdomHQ recorded Sep 5, 2026	201-500	303 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
2	Sapphire	Exact match	Newcastle Upon Tyne, United KingdomHQ recorded Sep 5, 2026	51-200	168 contacts →
	Exact match “Sapphire delivers comprehensive cyber solutions tailored to your needs, spanning across consultancy, managed services, IT/OT and beyond.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
3	Cyberfort	Exact match	Thatcham, United KingdomHQ recorded Sep 5, 2026	51-200	159 contacts →
	Exact match “At Cyberfort we are passionate about the cyber security services we deliver for our customers which keeps their people, data, systems and technology infrastructure secure…” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
4	Reliance Cyber	Exact match	Waterloo, United KingdomHQ recorded Sep 5, 2026	51-200	80 contacts →
	Exact match “At Reliance Cyber, we believe in truly partnering with our customers.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
5	Cyberowl	Exact match	London, United KingdomHQ recorded Sep 5, 2026	51-200	52 contacts →
	Exact match “CyberOwl helps asset operators in the maritime and critical national infrastructure sectors gain visibility, cyber security and cyber compliance of systems on their distributed…” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
6	Nothreat	Exact match	London, United KingdomHQ recorded Sep 5, 2026	11-50	36 contacts →
	Exact match “The future of IoT/OT security is here.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
7	Barrier Networks	Exact match	Glasgow, United KingdomHQ recorded Sep 5, 2026	11-50	34 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
8	Device Authority	Exact match	Reading, United KingdomHQ recorded Sep 5, 2026	11-50	32 contacts →
	Exact match “Device Authority enables end to end cyber resilience for connected devices through the discovery, visibility and automated security of large IoT/OT deployments.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
9	Intrinsic Security	Exact match	Peterborough, United KingdomHQ recorded Sep 5, 2026	51-200	32 contacts →
	Exact match “Intrinsic Security is a UK-headquartered cybersecurity firm delivering 24/7 threat detection, incident response, and resilience across cloud, hybrid, OT, IoT, and identity…” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
10	MAC Solutions UK LTD	Exact match	Redditch, United KingdomHQ recorded Sep 5, 2026	11-50	31 contacts →
	Exact match “MAC Solutions empowers industrial organisations to secure, connect, and innovate by delivering trusted IT and OT solutions.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
11	Converged Communication Solutions	Exact match	Aberdeen, United KingdomHQ recorded Sep 5, 2026	11-50	29 contacts →
	Exact match “Secure, Connect, Empower.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
12	Tekgem	Exact match	Sedgefield, United KingdomHQ recorded Sep 5, 2026	11-50	26 contacts →
	Exact match “Tekgem bridges the gap between Information Technology (IT) and Operational Technology (OT).” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
13	Sword Iacs	Exact match	Aberdeen, United KingdomHQ recorded Sep 5, 2026	11-50	22 contacts →
	Exact match “IACS Consulting are an Aberdeen based Industrial Automation Control System consultancy that specialises exclusively in cyber security for the production and safety critical…” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
14	Blue Cube Security LTD	Exact match	East Grinstead, United KingdomHQ recorded Sep 5, 2026	11-50	22 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
15	Cyber Energia	Exact match	London, United KingdomHQ recorded Sep 5, 2026	11-50	20 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
16	Infosec K2k	Exact match	London, United KingdomHQ recorded Sep 5, 2026	51-200	18 contacts →
	Exact match “Infosec K2K safeguards your organisation’s most valuable assets with tailored cybersecurity solutions.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
17	Sinevis	Exact match	London, United KingdomHQ recorded Sep 5, 2026	11-50	17 contacts →
	Exact match “We are a leading cybersecurity services organization with more than a decade of proven expertise in consulting, solution implementation and managed services.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
18	Datasixth Consulting	Exact match	London, United KingdomHQ recorded Sep 5, 2026	51-200	15 contacts →
	Exact match “Who We Are DataSixth delivers Cybersecurity Intelligence.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
19	Bandgi Technologies	Exact match	Maidenhead, United KingdomHQ recorded Sep 5, 2026	11-50	14 contacts →
	Exact match “Operational Technology Expertise (Utilities & Manufacturing Industry) Bandgi Technologies has deep hands-on experience delivering OT solutions for utility and industrial…” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
20	Deltaflare	Exact match	London, United KingdomHQ recorded Sep 5, 2026	11-50	12 contacts →
	Exact match “deltaflare helps critical infrastructure operators modernise securely.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
21	Bells IT Support	Exact match	Dartford, United KingdomHQ recorded Sep 5, 2026	1-10	11 contacts →
	Exact match “Welcome to Bells IT Support, your trusted partner for cyber security and IT support solutions.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
22	Otifyd	Exact match	London, United KingdomHQ recorded Sep 5, 2026	11-50	11 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
23	Cyberprism	Exact match	London, United KingdomHQ recorded Sep 5, 2026	11-50	11 contacts →
	Exact match “CyberPrism safeguards your business-critical Operational Technology (OT).” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
24	Swidch LTD	Exact match	London, United KingdomHQ recorded Sep 5, 2026	11-50	10 contacts →
	Exact match “swIDch stops OT attacks at the access layer by securing the most vulnerable endpoints in critical infrastructure.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
25	Baserock IT Solutions	Exact match	Stokenchurch, United KingdomHQ recorded Sep 5, 2026	11-50	9 contacts →
	Exact match “Enabling digital transformation with cyber secure IT/OT convergence.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “operational technology security companies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 96 operational technology security companies based in the United Kingdom

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Operational technology security companies based in the United Kingdom at a glance

As of Sep 5, 2026

31.9%Verified-email coverage

19.8%Mobile-number coverage

23.6Average contacts per company

11-50Median size (employees)

45.8%Largest-city concentration · London

Sep 5, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

6750–30

4131–60

061–90

090–180

6180+

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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: Company records associated with the United Kingdom whose business descriptions match “operational technology security companies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 722 professional contacts with verified work emails across the full matched dataset. 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 5, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Operational technology security companies by metro

Operational technology security companies in London44

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “operational technology security companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many operational technology security companies are there based in the United Kingdom?

RevenueBase identified 96 company matches for operational technology security companies associated with the United Kingdom as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Bridewell tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most operational technology security companies?

London leads with 44 company records, followed by Aberdeen (4) and Bristol (2).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 722 professional contacts with verified work emails tracked across these 96 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 5, 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.