Company lists · Data refreshed September 2026

Top 25 Facility security management based in the United Kingdom

RevenueBase identified 676 facility security management headquartered in the United Kingdom as of September 2026 and tracks 12,343 professional contacts across them, including 1,311 with verified work emails and 696 with mobile numbers. London is the largest hub.

This list covers facility security management 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 2, 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 Match evidence on every row Refreshed Sep 2, 2026 86% judged on-target in blind review
676Companies
12,343Contacts tracked
1,311Verified emails
696Mobile numbers
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The 25 largest facility security management based in the United Kingdom

Ranked by team size
Top 25 of 676 facility security management based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 2, 2026. Evidence rates how directly each company's own description names facility security management: 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 Kingdom1,001-5,000913

“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 2, 2026
2
Regency SecurityPartial evidence
Braintree, United Kingdom1,001-5,000325

“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 2, 2026
3
SES GroupIndirect evidence
Manchester, United Kingdom1,001-5,000280

“SES Group was founded in 1998 by Dr Tony Ball and rebranded as SES Group in 2014.”

Source: company website · checked Sep 2, 2026
4London, United Kingdom501-1,000204

“Wise Security is a trusted provider of professional security, crowd management, and safety solutions for high‑profile events, venues, and organisations across the UK.”

Source: company website · checked Sep 2, 2026
5
Guarding UKIndirect evidence
London, United Kingdom501-1,000164

“We are GUK.”

Source: company website · checked Sep 2, 2026
6
Vespasian SecurityPartial evidence
Portsmouth, United Kingdom201-500125

“Vespasian Security was formed in February 2006.”

Source: company website · checked Sep 2, 2026
7Waltham Abbey, United Kingdom201-50099

“With well over a decade of well-regarded service and trusted with the UK’s most prestigious events, Achilleus Security is the UK’s prime example of how security, stewarding, and…”

Source: company website · checked Sep 2, 2026
8
Octavian SecurityStrong evidence
Bingham, United Kingdom201-50091

“The multi award winning Octavian is one of the world's fastest growing, most forward thinking security and facilities management led businesses.”

Source: company website · checked Sep 2, 2026
9
K4 Security - K4 GroupPartial evidence
Manchester, United Kingdom201-50090

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

Source: company website · checked Sep 2, 2026
10Basingstoke Hamsphire, United Kingdom501-1,00087

“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 2, 2026
11
Bold Security GroupStrong evidence
Grays, United Kingdom201-50074

“Bold Security Group is a trusted provider of facilities management and security services, delivering dependable and tailored solutions that protect people, property and reputation.”

Source: company website · checked Sep 2, 2026
12
Northern Security LTDPartial evidence
Middlesbrough, United Kingdom201-50070

“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 2, 2026
13
Britsafe LimitedPartial evidence
York, United Kingdom501-1,00066

“Welcome to Britsafe Limited Years of Security and Cleaning experience have made us masters in providing defect-free security and cleaning solutions tailor-made to suit the…”

Source: company website · checked Sep 2, 2026
14London, United Kingdom201-50064

“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 2, 2026
15United Kingdom201-50063

“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 2, 2026
16
Black Diamond SecurityPartial evidence
London, United Kingdom201-50062

“Black Diamond Security - Safeguarding Your World.”

Source: company website · checked Sep 2, 2026
17Barnet, United Kingdom501-1,00060

“In today’s advanced, interconnected world, protecting the infrastructure that allows society to function is crucial.”

Source: company website · checked Sep 2, 2026
18
Controlled Space LimitedStrong evidence
Leeds, United Kingdom201-50054

“Controlled Space has been developed over the past 22 years to offer market leading security, stewarding and crowd management solutions.”

Source: company website · checked Sep 2, 2026
19
Portal SecurityPartial evidence
Glasgow, United Kingdom201-50052

“Portal Security is a leading provider of security services dedicated to safeguarding individuals, businesses, and communities.”

Source: company website · checked Sep 2, 2026
20South Normanton, United Kingdom201-50052

“Secur-it is a leading provider of security services and risk management.”

Source: company website · checked Sep 2, 2026
21
Leon GuardingPartial evidence
Ilford, United Kingdom201-50049

“LEON Guarding provides reliable, tailored security solutions to protect individuals, organizations, and assets all over UK.”

Source: company website · checked Sep 2, 2026
22
Phoenix FMSPartial evidence
Newcastle Upon Tyne, United Kingdom201-50044

“Design, install and maintain CCTV Systems Intruder Systems Access Control Manned Security Guarding Event Stewarding Construction Cleaning Commercial Cleaning Builders & Sparkle…”

Source: company website · checked Sep 2, 2026
23
AIB GroupPartial evidence
Park Bletchley, United Kingdom201-50043

“All in Black are an accredited security solutions provider with over 20 years’ experience at the highest level across the UK.”

Source: company website · checked Sep 2, 2026
24London, United Kingdom501-1,00043

“AK9 Security and FM Solutions offers comprehensive security solutions for businesses, governmental organizations, and residential areas.”

Source: company website · checked Sep 2, 2026
25Canterbury, United Kingdom201-50041

“Professional Security & Facilities Support for Commercial & Public Sector Sites Akon Security Services Ltd provides professional, reliable security and facilities support across…”

Source: company website · checked Sep 2, 2026

Showing 25 of 676 facility security management based in the United Kingdom

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Facility security management based in the United Kingdom at a glance

As of Sep 2, 2026
11-50Median size (employees)
LondonLargest hub · 167 HQs
696Contacts with mobile numbers
Sep 2, 2026Data refreshed

Companies by employee count

1-10
180
11-50
226
51-200
175
201-500
52
501-1,000
17
1,001-5,000
11
10001+
2

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 facility security management, 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 “facility security management”. 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 facility security management, 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, 1,311 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 2, 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.

Facility security management by metro

  • Facility security management in London167

Frequently asked

How many facility security management are there based in the United Kingdom?

RevenueBase identified 676 facility security management 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 facility security management?

London leads with 167 headquartered companies, followed by Birmingham (23) and Leeds (17).

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 1,311 verified decision-maker contacts tracked across these 676 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 2, 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.