Company lists · Data refreshed September 2026

Top 25 Physical security companies based in the United Kingdom

RevenueBase identified 1,661 physical security companies headquartered in the United Kingdom as of September 2026 and tracks 18,135 professional contacts across them, including 2,944 with verified work emails and 955 with mobile numbers. London is the largest hub.

This list covers physical 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, how directly it supports the match, 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 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 5, 2026 86% judged on-target in blind review
1,661Companies
18,135Contacts tracked
2,944Verified emails
955Mobile numbers
Unlock all 1,661 companies Free signup · no credit card · 500 free credits

The 25 largest physical security companies based in the United Kingdom

Ranked by team size
Top 25 of 1,661 physical security companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names physical security 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
CIS Security LimitedPartial evidence
London, United KingdomHQ checked Sep 5, 20261,001-5,000919

“CIS Security is an independent security company equipped to help customers to solve the complex challenges in today’s digital, connected and regulated business world.”

Source: company website · checked Sep 5, 2026
2
SecurigroupPartial evidence
United KingdomHQ checked Sep 5, 20261,001-5,000765

“Ranked in the top 1% of UK security companies, as approved by the Security Industry Authority, SecuriGroup is an award-winning security company, specialising in the provision of…”

Source: company website · checked Sep 5, 2026
3
Marlowe Fire & SecurityPartial evidence
Manchester, United KingdomHQ checked Sep 5, 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 5, 2026
4
Regency SecurityPartial evidence
Braintree, United KingdomHQ checked Sep 5, 20261,001-5,000326

“Established in 1993, with commitment to our customers and staff alongside a strong ethos and standards driven approach, Regency Security is now the largest provider of door…”

Source: company website · checked Sep 5, 2026
5
InterrIndirect evidence
London, United KingdomHQ checked Sep 5, 20261,001-5,000232

“Established in 1994, Interr is a specialist agency providing intelligent guarding, reception, remote monitoring & response and front of house solutions within the retail, hotel…”

Source: company website · checked Sep 5, 2026
6Sidcup, United KingdomHQ checked Sep 5, 2026201-500166

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

Source: company website · checked Sep 5, 2026
7
The Keyholding CompanyPartial evidence
London, United KingdomHQ checked Sep 5, 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 5, 2026
8
Kingdom Security ServicesPartial evidence
Newton-le-willows, United KingdomHQ checked Sep 5, 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 5, 2026
9Watford, United KingdomHQ checked Sep 5, 202651-200116

“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 5, 2026
10
Bradbury GroupStrong evidence
Scunthorpe, United KingdomHQ checked Sep 5, 2026201-500113

“Bradbury Group is the UK’s largest manufacturer of physical security products, including steel doors, grilles and cages.”

Source: company website · checked Sep 5, 2026
11
City SecurityPartial evidence
Plympton, United KingdomHQ checked Sep 5, 202651-200105

“City Security understands that our staff are the first and last person a patron encounters on their visit to a venue.”

Source: company website · checked Sep 5, 2026
12
Prime SecureIndirect evidence
Glasgow, United KingdomHQ checked Sep 5, 202651-20093

“Innovation is at our core.”

Source: company website · checked Sep 5, 2026
13
K4 Security - K4 GroupPartial evidence
Hounslow, United KingdomHQ checked Sep 5, 2026201-50089

“For a better service and competitive price try K4 Security Services At K4 we offer the following: 1.”

Source: company website · checked Sep 5, 2026
14Whiteley, United KingdomHQ checked Sep 5, 2026501-1,00087

“Croma Security Solutions Group (CSSG) began in 1970 as a family-run business in Shirley, Southampton, known as County Locksmiths.”

Source: company website · checked Sep 5, 2026
15London, United KingdomHQ checked Sep 5, 202651-20085

“At Servoca Secure Solutions, we take great pride in delivering a multi-service security business; offering a range of complementary products and services to both the public and…”

Source: company website · checked Sep 5, 2026
16
Nationwide SecurityStrong evidence
St Albans, United KingdomHQ checked Sep 5, 202651-20081

“Nationwide Security providing both physical and electrical security services throughout the UK.”

Source: company website · checked Sep 5, 2026
17
ABELPartial evidence
Leicester, United KingdomHQ checked Sep 5, 202651-20070

“With over 50 years’ experience in the security industry, Abel has grown to become one of the UK’s largest privately owned providers of electronic security systems.”

Source: company website · checked Sep 5, 2026
18
Northern Security LTDPartial evidence
Carlisle, United KingdomHQ checked Sep 5, 2026201-50069

“Northern Security Ltd is a leading guarding, alarm response and electronic security business operating throughout the North of England and South West Scotland.”

Source: company website · checked Sep 5, 2026
19Sandbach, United KingdomHQ checked Sep 5, 202651-20064

“We are a globally recognised leader in design-led physical security solutions.”

Source: company website · checked Sep 5, 2026
20London, United KingdomHQ checked Sep 5, 2026201-50064

“United Guarding Services has been a trusted name in the security industry for over 30 years, providing high-performance security solutions for prestigious premises in London and…”

Source: company website · checked Sep 5, 2026
21London, United KingdomHQ checked Sep 5, 2026201-50064

“City Security Services (CSS) have more than 25 years’ experience within the corporate security, public sector, education and social housing markets delivering manned guarding…”

Source: company website · checked Sep 5, 2026
22
WLSPartial evidence
London, United KingdomHQ checked Sep 5, 202651-20061

“WLS (West London Security) has been providing security and solutions to London's homes and businesses for over 40 years.”

Source: company website · checked Sep 5, 2026
23
Sentinel Group SecurityPartial evidence
Loughton, United KingdomHQ checked Sep 5, 2026201-50060

“Sentinel Group Security is a fast growing provider of all aspects of security personnel and manned security services operating across the United Kingdom.”

Source: company website · checked Sep 5, 2026
24
Black Diamond SecurityPartial evidence
London, United KingdomHQ checked Sep 5, 2026201-50058

“Black Diamond Security - Safeguarding Your World.”

Source: company website · checked Sep 5, 2026
25Aldershot, United KingdomHQ checked Sep 5, 202651-20053

“Shield Security Services Limited was incorporated in 1986.”

Source: company website · checked Sep 5, 2026

Showing 25 of 1,661 physical security companies based in the United Kingdom

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Physical security companies based in the United Kingdom at a glance

As of Sep 5, 2026
11-50Median size (employees)
LondonLargest hub · 281 HQs
955Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
756
11-50
515
51-200
277
201-500
68
501-1,000
11
1,001-5,000
8
5,001-10,000
2
10001+
2

Verified emails by last verification

0–30
2,744
31–60
187
61–90
3
90–180
0
180+
10

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 physical security 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 “physical security 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 physical 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 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, 2,944 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.

Frequently asked

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

RevenueBase identified 1,661 physical 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?

CIS Security Limited, headquartered in London, tops this list with the largest team on record.

Which city has the most physical security companies?

London leads with 281 headquartered companies, followed by Manchester (47) and Birmingham (38).

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 2,944 verified decision-maker contacts tracked across these 1,661 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 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.