Company lists · Data refreshed September 2026

Top 25 Security and access control companies based in the United Kingdom

RevenueBase identified 3,076 security and access control companies headquartered in the United Kingdom as of September 2026 and tracks 116,657 professional contacts across them, including 11,461 with verified work emails and 9,404 with mobile numbers. London is the largest hub.

This list covers security and access control 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 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.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 6, 2026 86% judged on-target in blind review
3,076Companies
116,657Contacts tracked
11,461Verified emails
9,404Mobile numbers
Explore all 3,076 companies → Free signup · no credit card · 500 free credits

The 25 largest security and access control companies based in the United Kingdom

Ranked by team size
Top 25 of 3,076 security and access control companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 6, 2026. Evidence rates how directly each company's own description names security and access control 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.
#CompanyHeadquartersEmployeesContacts
1
G4sPartial evidence
London, United KingdomHQ checked Sep 6, 202610001+79,699

“G4S is a leading security and facility services company that provides proactive security services and cutting-edge smart technology to deliver tailored, integrated security…”

Source: company website · checked Sep 6, 2026
2
Chubb Fire & SecurityIndirect evidence
Staines, United KingdomHQ checked Sep 6, 202610001+6,169

“Making the world a safer place.”

Source: company website · checked Sep 6, 2026
3
Global SecurityStrong evidence
Blackburn, United KingdomHQ checked Sep 6, 2026n/a393

“At Global Security Ltd, we are proud to be one of the UK’s trusted suppliers of CCTV, intruder alarms, access control, and fire safety systems.”

Source: company website · checked Sep 6, 2026
4
Marlowe Fire & SecurityPartial evidence
Manchester, United KingdomHQ checked Sep 6, 2026501-1,000389

“Mitie Fire & Security is part of Mitie, the UK’s leading facilities management and professional services company, delivering integrated fire and security solutions that protect…”

Source: company website · checked Sep 6, 2026
5Exeter, United KingdomHQ checked Sep 6, 2026501-1,000386

“Trinity’s mission statement is simple - to provide high quality design, installation, commissioning and long term after care of Fire Detection, Fire Suppression, Life Safety and…”

Source: company website · checked Sep 6, 2026
6
Hall & KAYPartial evidence
Ascot / Birmingham / Manchester / Glasgow, United KingdomHQ checked Sep 6, 2026201-500341

“We deliver complex fire protection and security solutions.”

Source: company website · checked Sep 6, 2026
7
Kings Secure TechnologiesIndirect evidence
Bradford, United KingdomHQ checked Sep 6, 2026501-1,000326

“Kings Secure Technologies (KST) is a high-end, enterprise-level systems integrator.”

Source: company website · checked Sep 6, 2026
8
Paxton Access LTDIndirect evidence
Brighton, United KingdomHQ checked Sep 6, 2026201-500255

“With 40 years of experience, Paxton is a company passionate about technology.”

Source: company website · checked Sep 6, 2026
9Shirley, United KingdomHQ checked Sep 6, 20261,001-5,000226

“MAN Commercial is a leading security company and Training Academy based in Solihull, West Midlands.”

Source: company website · checked Sep 6, 2026
10
Scci AlphatrackIndirect evidence
Harlow, United KingdomHQ checked Sep 6, 2026201-500205

“Part of the SCCI Group, SCCI Alphatrack designs, installs, and maintains connected building systems across social housing, commercial property, new builds, and public sector…”

Source: company website · checked Sep 6, 2026
11Marlow, United KingdomHQ checked Sep 6, 2026201-500200

“Founded in 1996 we have grown into one of the UK and Ireland’s leading qualified and accredited security and fire systems integrators, working across Europe to bring together…”

Source: company website · checked Sep 6, 2026
12Romford, United KingdomHQ checked Sep 6, 2026201-500200

“OpenView Security Solutions is the UK’S largest privately owned independent security company and provides unique, innovative and technologically excellent solutions to meet…”

Source: company website · checked Sep 6, 2026
13
Abca Fire And SecurityPartial evidence
Newcastle Upon Tyne, United KingdomHQ checked Sep 6, 2026201-500195

“Surefire Business Protection No matter the sector you work in, or where you’re located in the UK, we can help you to make sure that fire and security problems are not things you…”

Source: company website · checked Sep 6, 2026
14Middx, United KingdomHQ checked Sep 6, 2026201-500175

“We are able to supply a one stop security service for all types of security requirement.”

Source: company website · checked Sep 6, 2026
15
Texecom LTDIndirect evidence
Haslingden, United KingdomHQ checked Sep 6, 2026201-500170

“Looking after the things people care about, wherever they are’.”

Source: company website · checked Sep 6, 2026
16Sidcup, United KingdomHQ checked Sep 6, 2026201-500166

“Trigion Security Services is the UK provider of Security Guarding and Technical Solutions for Facilicom UK.”

Source: company website · checked Sep 6, 2026
17
QCICPartial evidence
London, United KingdomHQ checked Sep 6, 202651-200159

“QCIC is an award-winning global engineering firm specialising in designing, building and running security systems.”

Source: company website · checked Sep 6, 2026
18
Norbain SDStrong evidence
Bracknell, United KingdomHQ checked Sep 6, 202651-200157

“Norbain is a leading UK security distributor, covering video surveillance, access control & intruder detection solutions.”

Source: company website · checked Sep 6, 2026
19
Gough & KellyPartial evidence
Leeds, United KingdomHQ checked Sep 6, 202651-200157

“A premier provider of security products and services across England, Gough & Kelly was formed in 1988 to influence and inspire the security and electrical marketplace by providing…”

Source: company website · checked Sep 6, 2026
20
EvanderIndirect evidence
Norwich, United KingdomHQ checked Sep 6, 2026201-500155

“For over 50 years, Evander has been trusted to make homes and businesses safe, secure, and ready for what’s next.”

Source: company website · checked Sep 6, 2026
21Manchester, United KingdomHQ checked Sep 6, 202651-200153

“Capricorn Security Group has been a Security Industry Authority (SIA) approved contractor for over 9 years and is ranked in the top 5% of Security Companies in the UK.”

Source: company website · checked Sep 6, 2026
22Chalfont St Peter, United KingdomHQ checked Sep 6, 202651-200145

“Frontline Security Solutions is a global electronic security integrator specialising in Access Control, CCTV, Intruder and Intercom systems that protect people, property and…”

Source: company website · checked Sep 6, 2026
23
The Keyholding CompanyPartial evidence
London, United KingdomHQ checked Sep 6, 202651-200137

“The Keyholding Company are a tech-enabled mobile security services company, specialising in alarm response, mobile patrols, locks and unlocks, emergency and temporary guarding…”

Source: company website · checked Sep 6, 2026
24
Kingdom Security ServicesPartial evidence
Newton-le-willows, United KingdomHQ checked Sep 6, 20265,001-10,000126

“About Kingdom Security Established in March 1993, Kingdom Security is a leading UK security provider delivering professional, fully licensed security services nationwide.”

Source: company website · checked Sep 6, 2026
25
Vantage SecurityPartial evidence
West Midlands, United KingdomHQ checked Sep 6, 2026201-500124

“Having a 34 year old presence in the security & surveillance industry, Vantage has seen the industry being conceived and mature over time and have been at the forefront of every…”

Source: company website · checked Sep 6, 2026

Showing 25 of 3,076 security and access control companies based in the United Kingdom

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Security and access control companies based in the United Kingdom at a glance

As of Sep 6, 2026
1-10Median size (employees)
LondonLargest hub · 346 HQs
9,404Contacts with mobile numbers
Sep 6, 2026Data refreshed

Companies by employee count

1-10
1,620
11-50
984
51-200
325
201-500
71
501-1,000
19
1,001-5,000
9
5,001-10,000
2
10001+
4

Verified emails by last verification

0–30
10,717
31–60
703
61–90
5
90–180
4
180+
32

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 and access control 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 “security and access control 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 security and access control 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, 11,461 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.

Frequently asked

How many security and access control companies are there based in the United Kingdom?

RevenueBase identified 3,076 security and access control 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?

G4s, headquartered in London, tops this list with the largest team on record.

Which city has the most security and access control companies?

London leads with 346 headquartered companies, followed by Manchester (73) and Birmingham (49).

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 11,461 verified decision-maker contacts tracked across these 3,076 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.

Ready to reach these companies? Verified emails and direct dials for all 3,076 security and access control companies based in the United Kingdom. Start with a free account, no credit card.

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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.