Company lists · Data refreshed September 2026
Top 25 Security engineers based in the United Kingdom
RevenueBase identified 146 security engineers headquartered in the United Kingdom as of September 2026 and tracks 1,974 professional contacts across them, including 898 with verified work emails and 113 with mobile numbers. London is the largest hub.
This list covers security engineers 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 6, 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 security engineers based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 502 | ||||
“SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | Hall & KAYPartial evidence | 341 | |||
“We deliver complex fire protection and security solutions.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | QCICStrong evidence | 159 | |||
“QCIC is an award-winning global engineering firm specialising in designing, building and running security systems.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 116 | ||||
“TSP has a reputation for providing enterprise security solutions, as well as excellent system integration standards and exceptional aftercare support, since its founding in 1988.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | 95 | ||||
“SEP2 is an award-winning UK-based cyber security specialist service provider, powered by a dedicated team of experts available 24/7/365.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 61 | ||||
“MDSec are a UK based consultancy with a passion for information security.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | Logic Fire And SecurityPartial evidence | 55 | |||
“At Logic Fire and Security we design, supply, install, commission and maintain fire detection systems and electronic security systems throughout the UK.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | 42 | ||||
“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 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | Protectorcomms LTDIndirect evidence | 24 | |||
Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | 24 | ||||
“More than just a manufacturer, we offer a full service.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | 18 | ||||
“Taylor Technology Systems are an established designer, installer and maintainer of security, CCTV, intruder alarms, access control, power and data, and fire detection systems.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 18 | ||||
“Hexiosec is the new name for Red Maple Technologies.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | 16 | ||||
“APM Fire and Security are specialists in the field of fire and electronic security systems for commercial and domestic premises backed by more than 27 years experience.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | First City CarePartial evidence | 15 | |||
“Electronic Security Systems Design, Installation and Maintenance Provider.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 13 | ||||
“ai security specialises in providing long-term security solutions and CCTV systems for any enterprise; we’ll make sure your premises and staff are always protected.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | 13 | ||||
“For over 50 years, Centurion Fire & Security has been safeguarding commercial environments with robust, state-of-the-art fire and security systems.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | 10 | ||||
“Alphatech Resources is a young company built on the foundations of providing a high standard of candidate as well as customer services level that cannot be beaten.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | G2 SecurityPartial evidence | 9 | |||
“G2 Security is a security and investigations company based out of Business Centre.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | Toren Consulting LTDPartial evidence | 8 | |||
“Security gets designed into buildings at RIBA 2-3.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | 8 | ||||
“Chubb Systems is one of the leading designers and integrators of security systems identifying and solving complex requirements to critical national infrastructure and large scale…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | 7 | ||||
“Engineered Security.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | 7 | ||||
“RS Security Consultants We are a team of highly experienced, independent security consultants who work with our Clients to determine best value, bespoke electronic security…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | 7 | ||||
“Founded in Diamond Fire & Security is a family-owned fire engineering and security specialist based in Cannock, serving businesses and organisations across the UK.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | Klaatu IT Security LTDPartial evidence | 7 | |||
“Klaatu IT Security is an IT security consultancy and developer.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 25 | 7 | ||||
“Now in our 20th year, Abacus Security specialise in the supply, installation and maintenance of electronic security and fire detection systems, both domestic and commercial.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 146 security engineers based in the United Kingdom
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Security engineers based in the United Kingdom at a glance
As of Sep 6, 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 security engineers, 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 “security engineers”. 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 security engineers, 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, 898 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 6, 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.
Security engineers by metro
- Security engineers in London33
Frequently asked
How many security engineers are there based in the United Kingdom?
RevenueBase identified 146 security engineers 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?
Securityhq, headquartered in Gb, tops this list with the largest team on record.
Which city has the most security engineers?
London leads with 33 headquartered companies, followed by Bristol (3) and Leeds (3).
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 898 verified decision-maker contacts tracked across these 146 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 6, 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.