Company lists · Data refreshed September 2026

Top 24 Infrastructure security software companies based in the United Kingdom

Name: Infrastructure security software 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 3, 2026 194 companies tracked

RevenueBase identified 194 infrastructure security software companies headquartered in the United Kingdom as of September 2026 and tracks 4,494 professional contacts across them, including 1,574 with verified work emails and 422 with mobile numbers. London is the largest hub.

This list covers infrastructure security software 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, 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.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 3, 2026 86% judged on-target in blind review

194Companies

4,494Contacts tracked

1,574Verified emails

422Mobile numbers

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The 24 largest infrastructure security software companies based in the United Kingdom

Ranked by team size

Top 24 of 194 infrastructure security software companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 3, 2026. Evidence rates how directly each company's own description names infrastructure security software companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	BridewellStrong evidence	Reading, United KingdomHQ checked Sep 3, 2026	201-500	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, 2026
2	Quorum CyberIndirect evidence	Edinburgh, United KingdomHQ checked Sep 3, 2026	201-500	292
	“At Quorum Cyber, we're on a mission to help good people win.” Source: company website · checked Sep 3, 2026
3	Exclusive Networks UKPartial evidence	Alton, United KingdomHQ checked Sep 3, 2026	201-500	168
	“Exclusive Networks is a global trusted cybersecurity specialist for digital infrastructure helping to drive the transition to a totally trusted digital future for all people and…” Source: company website · checked Sep 3, 2026
4	Khipu NetworksPartial evidence	Fleet, United KingdomHQ checked Sep 3, 2026	51-200	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, 2026
5	Nomios Uk&iIndirect evidence	Basingstoke, United KingdomHQ checked Sep 3, 2026	51-200	96
	“We are committed to developing solutions and services that secure and connect the increasingly complex digital landscape.” Source: company website · checked Sep 3, 2026
6	OptilanPartial evidence	Royal Leamington Spa, United KingdomHQ checked Sep 3, 2026	201-500	94
	“Optilan is a leading independent security and communications systems integrator worldwide.” Source: company website · checked Sep 3, 2026
7	Titania LTDPartial evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	89
	“Dedicated to securing the networks society depends on.” Source: company website · checked Sep 3, 2026
8	RHI Industrials LTDStrong evidence	Matfen, United KingdomHQ checked Sep 3, 2026	51-200	71
	“RHI Industrials provide Physical and Electronic Security Solutions to the UK's major utility companies and partners: Critical National Infrastructure Facilities, Electricity…” Source: company website · checked Sep 3, 2026
9	Eset UKIndirect evidence	Bournemouth, United KingdomHQ checked Sep 3, 2026	51-200	66
	“We help businesses and individuals stay protected in an increasingly complex digital world.” Source: company website · checked Sep 3, 2026
10	IntruderIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	61
	“Intruder was founded in 2015 to help solve the information overload crisis in vulnerability management.” Source: company website · checked Sep 3, 2026
11	Garrison NOW A Part Of EverfoxIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	59
	“Garrison is a London-based cybersecurity company founded in 2014 by David Garfield (CEO) and Henry Harrison (Chief Scientist).” Source: company website · checked Sep 3, 2026
12	Coretech SecurityPartial evidence	Cheltenham, United KingdomHQ checked Sep 3, 2026	51-200	41
	“CoreTech is a specialist cyber security company whose people are motivated by the desire to deliver exceptional capabilities coupled with a real sense of mission.” Source: company website · checked Sep 3, 2026
13	Remsdaq LTDPartial evidence	Wales, United KingdomHQ checked Sep 3, 2026	51-200	39
	“Remsdaq Ltd, is a UK-based hardware and software system engineering company supplying off-the-shelf and turnkey solutions for SCADA (sub-station EHV/HV/MV/LV monitoring)…” Source: company website · checked Sep 3, 2026
14	OmertaPartial evidence	Saffron Walden, United KingdomHQ checked Sep 3, 2026	51-200	38
	“Omerta - A Global Security Technology and Services Company.” Source: company website · checked Sep 3, 2026
15	defense.comPartial evidence	Stevenage, United KingdomHQ checked Sep 3, 2026	51-200	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, 2026
16	Cortech DevelopmentsStrong evidence	Knutsford, United KingdomHQ checked Sep 3, 2026	11-50	30
	“Established in 1992, Cortech Developments is a successful UK based company who specialise in software integration solutions for smarter building, fire, safety and security systems.” Source: company website · checked Sep 3, 2026
17	snapsec.coPartial evidence	London, United KingdomHQ checked Sep 3, 2026	1-10	30
	“SnapSec is a cybersecurity company specializing in centralized application security operations.” Source: company website · checked Sep 3, 2026
18	TekgemIndirect evidence	Sedgefield, United KingdomHQ checked Sep 3, 2026	11-50	26
	“Tekgem bridges the gap between Information Technology (IT) and Operational Technology (OT).” Source: company website · checked Sep 3, 2026
19	ValarianPartial evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	24
	“Valarian builds infrastructure for organisations operating in high-trust, high-stakes environments.” Source: company website · checked Sep 3, 2026
20	4secure LTDPartial evidence	Northampton, United KingdomHQ checked Sep 3, 2026	11-50	22
	“4Secure is a trusted provider of software defined, cross-network/cross-domain cybersecurity solutions for commercial, government and defence.” Source: company website · checked Sep 3, 2026
21	ClearswiftIndirect evidence	Berkshire, United KingdomHQ checked Sep 3, 2026	201-500	19
	“Why Clearswift?” Source: company website · checked Sep 3, 2026
22	HexiosecIndirect evidence	Cheltenham, United KingdomHQ checked Sep 3, 2026	11-50	18
	“Hexiosec is the new name for Red Maple Technologies.” Source: company website · checked Sep 3, 2026
23	Trustify LTDPartial evidence	Edinburgh, United KingdomHQ checked Sep 3, 2026	11-50	17
	“Trustify is a Cybersecurity software vendor based in Edinburgh, Scotland.” Source: company website · checked Sep 3, 2026
24	CyberhiveIndirect evidence	Newbury, United KingdomHQ checked Sep 3, 2026	11-50	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, 2026

Showing 24 of 194 infrastructure security software companies based in the United Kingdom

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Infrastructure security software companies based in the United Kingdom at a glance

As of Sep 3, 2026

11-50Median size (employees)

LondonLargest hub · 67 HQs

422Contacts with mobile numbers

Sep 3, 2026Data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

10001+

Verified emails by last verification

0–30

31–60

148

61–90

916

90–180

499

180+

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 infrastructure security software companies, 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 “infrastructure security software companies”. 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 infrastructure security software 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 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, 1,574 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.

Infrastructure security software companies by metro

Infrastructure security software companies in London67

Frequently asked

How many infrastructure security software companies are there based in the United Kingdom?

RevenueBase identified 194 infrastructure security software 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 Edinburgh, tops this list with the largest team on record.

Which city has the most infrastructure security software companies?

London leads with 67 headquartered companies, followed by Manchester (7) and Edinburgh (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 1,574 verified decision-maker contacts tracked across these 194 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.