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 operational technology security companies headquartered in 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 operational technology security companies 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 5, 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 5, 2026 86% judged on-target in blind review

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 operational technology security companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 5, 2026. RevenueBase Smart Search rates how each company's information relates to operational technology 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	Bridewell	Partial evidence	Reading, United KingdomHQ checked Sep 5, 2026	201-500	303 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 5, 2026
2	Sapphire	Indirect evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 5, 2026	51-200	168 contacts →
	Indirect evidence “Sapphire delivers comprehensive cyber solutions tailored to your needs, spanning across consultancy, managed services, IT/OT and beyond.” Source: RevenueBase Database · checked Sep 5, 2026
3	Cyberfort	Strong evidence	Thatcham, United KingdomHQ checked Sep 5, 2026	51-200	159 contacts →
	Strong evidence “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…” Source: RevenueBase Database · checked Sep 5, 2026
4	Reliance Cyber	Indirect evidence	Waterloo, United KingdomHQ checked Sep 5, 2026	51-200	80 contacts →
	Indirect evidence “At Reliance Cyber, we believe in truly partnering with our customers.” Source: RevenueBase Database · checked Sep 5, 2026
5	Cyberowl	Partial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	52 contacts →
	Partial 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 5, 2026
6	Nothreat	Partial evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	36 contacts →
	Partial evidence “The future of IoT/OT security is here.” Source: RevenueBase Database · checked Sep 5, 2026
7	Barrier Networks	Indirect evidence	Glasgow, United KingdomHQ checked Sep 5, 2026	11-50	34 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 5, 2026
8	Device Authority	Partial evidence	Reading, United KingdomHQ checked Sep 5, 2026	11-50	32 contacts →
	Partial evidence “Device Authority enables end to end cyber resilience for connected devices through the discovery, visibility and automated security of large IoT/OT deployments.” Source: RevenueBase Database · checked Sep 5, 2026
9	Intrinsic Security	Partial evidence	Peterborough, United KingdomHQ checked Sep 5, 2026	51-200	32 contacts →
	Partial evidence “Intrinsic Security is a UK-headquartered cybersecurity firm delivering 24/7 threat detection, incident response, and resilience across cloud, hybrid, OT, IoT, and identity…” Source: RevenueBase Database · checked Sep 5, 2026
10	MAC Solutions UK LTD	Indirect evidence	Redditch, United KingdomHQ checked Sep 5, 2026	11-50	31 contacts →
	Indirect evidence “MAC Solutions empowers industrial organisations to secure, connect, and innovate by delivering trusted IT and OT solutions.” Source: RevenueBase Database · checked Sep 5, 2026
11	Converged Communication Solutions	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 5, 2026	11-50	29 contacts →
	Indirect evidence “Secure, Connect, Empower.” Source: RevenueBase Database · checked Sep 5, 2026
12	Tekgem	Strong evidence	Sedgefield, United KingdomHQ checked Sep 5, 2026	11-50	26 contacts →
	Strong evidence “Tekgem bridges the gap between Information Technology (IT) and Operational Technology (OT).” Source: RevenueBase Database · checked Sep 5, 2026
13	Sword Iacs	Partial evidence	Aberdeen, United KingdomHQ checked Sep 5, 2026	11-50	22 contacts →
	Partial evidence “IACS Consulting are an Aberdeen based Industrial Automation Control System consultancy that specialises exclusively in cyber security for the production and safety critical…” Source: RevenueBase Database · checked Sep 5, 2026
14	Blue Cube Security LTD	Partial evidence	East Grinstead, United KingdomHQ checked Sep 5, 2026	11-50	22 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 5, 2026
15	Cyber Energia	Partial evidence	London, United KingdomHQ checked Sep 5, 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 5, 2026
16	Infosec K2k	Indirect evidence	London, United KingdomHQ checked Sep 5, 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 5, 2026
17	Sinevis	Indirect evidence	London, United KingdomHQ checked Sep 5, 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 5, 2026
18	Datasixth Consulting	Indirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	15 contacts →
	Indirect evidence “Who We Are DataSixth delivers Cybersecurity Intelligence.” Source: RevenueBase Database · checked Sep 5, 2026
19	Bandgi Technologies	Strong evidence	Maidenhead, United KingdomHQ checked Sep 5, 2026	11-50	14 contacts →
	Strong evidence “Operational Technology Expertise (Utilities & Manufacturing Industry) Bandgi Technologies has deep hands-on experience delivering OT solutions for utility and industrial…” Source: RevenueBase Database · checked Sep 5, 2026
20	Deltaflare	Indirect evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	12 contacts →
	Indirect evidence “deltaflare helps critical infrastructure operators modernise securely.” Source: RevenueBase Database · checked Sep 5, 2026
21	Bells IT Support	Partial evidence	Dartford, United KingdomHQ checked Sep 5, 2026	1-10	11 contacts →
	Partial evidence “Welcome to Bells IT Support, your trusted partner for cyber security and IT support solutions.” Source: RevenueBase Database · checked Sep 5, 2026
22	Otifyd	Strong evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	11 contacts →
	Strong 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 5, 2026
23	Cyberprism	Strong evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	11 contacts →
	Strong evidence “CyberPrism safeguards your business-critical Operational Technology (OT).” Source: RevenueBase Database · checked Sep 5, 2026
24	Swidch LTD	Partial evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	10 contacts →
	Partial evidence “swIDch stops OT attacks at the access layer by securing the most vulnerable endpoints in critical infrastructure.” Source: RevenueBase Database · checked Sep 5, 2026
25	Baserock IT Solutions	Indirect evidence	Stokenchurch, United KingdomHQ checked Sep 5, 2026	11-50	9 contacts →
	Indirect evidence “Enabling digital transformation with cyber secure IT/OT convergence.” Source: RevenueBase Database · checked Sep 5, 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: operational technology 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 operational technology security companies.
Partial evidence: Its own public description names part of operational technology security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name operational technology 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 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

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among operational technology 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 the United Kingdom whose own description of what they do matches “operational technology 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 operational technology 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 operational technology security companies, 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 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, 722 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 5, 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.

Operational technology security companies by metro

Operational technology security companies in London44

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

RevenueBase identified 96 operational technology security companies 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 Reading, tops this list with the largest team on record.

Which city has the most operational technology security companies?

London leads with 44 headquartered companies, 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 the top results, verified emails and direct dials included. Upgrading unlocks all 722 verified decision-maker contacts tracked across these 96 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 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 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.