Company lists · Data refreshed September 2026

Top 24 Facility security management based in London, United Kingdom

Name: Facility security management based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 12, 2026 171 companies tracked

RevenueBase identified 171 facility security management headquartered in London, United Kingdom as of September 2026 and tracks 2,803 professional contacts across them, including 459 with verified work emails and 97 with mobile numbers. Across the United Kingdom, London is the largest hub for this category.

This list covers facility security management headquartered in London, 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 12, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 RevenueBase Smart Search rating on every row Refreshed Sep 12, 2026 86% judged on-target in blind review

171Companies

2,803Contacts tracked

459Verified emails

97Mobile numbers

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The 24 largest facility security management based in London, United Kingdom

Ranked by team size

Top 24 of 171 facility security management based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 12, 2026. RevenueBase Smart Search rates how each company's information relates to facility security management: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	CIS Security Limited	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1,001-5,000	919 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 12, 2026
2	The Keyholding Company	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	137 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 12, 2026
3	Servoca Secure Solutions Limited	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	85 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 12, 2026
4	City Security Services Part Of City Group Security	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	64 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 12, 2026
5	Black Diamond Security	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	58 contacts →
	Partial evidence “Black Diamond Security - Safeguarding Your World.” Source: RevenueBase Database · checked Sep 12, 2026
6	Custom Intelligent Security	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	51 contacts →
	Partial evidence “Established in Custom Intelligent Security is a technology driven ISO27001 & NSi Gold Accredited independent electronic security specialist with a proven track record of…” Source: RevenueBase Database · checked Sep 12, 2026
7	Ak9 Security And FM Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	501-1,000	43 contacts →
	Partial evidence “AK9 Security and FM Solutions offers comprehensive security solutions for businesses, governmental organizations, and residential areas.” Source: RevenueBase Database · checked Sep 12, 2026
8	Gratte Brothers Security Systems & Software	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	39 contacts →
	Partial evidence “Gratte Brothers is an experienced provider of integrated security solutions, which are Built on Strong Values and ultimately deliver a measurable return on investment.” Source: RevenueBase Database · checked Sep 12, 2026
9	BML Group	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	37 contacts →
	Strong evidence “Founded in 2015, BML Group is one of the UK's leading Security & Facilities Management providers, delivering tailored solutions that enhance operational efficiency and safety.” Source: RevenueBase Database · checked Sep 12, 2026
10	Welcome Gate	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	23 contacts →
	Partial evidence “Who are you… Most likely you are a Workplace or IT Professional with a lot on your plate including physical electronic security systems, such as - Access control - CCTV - Intruder…” Source: RevenueBase Database · checked Sep 12, 2026
11	Line Security Services LTD	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	17 contacts →
	Partial evidence “As a security services provider, protecting people and assets is our top priority.” Source: RevenueBase Database · checked Sep 12, 2026
12	SSG Support Services Group LTD	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	16 contacts →
	Partial evidence “SSG Support Services Group LTD is specialists in provision of Manned guarding Security Services, Door Supervision, Security Guarding, Out of Hours Support, Concierge, Front of…” Source: RevenueBase Database · checked Sep 12, 2026
13	Integrated Visual Protection Limited	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	16 contacts →
	Partial evidence “Integrated Visual Protection Limited (IVP) is a privately owned Company, which has been established since 2002, providing all types of Fire and Security Services to a variety of…” Source: RevenueBase Database · checked Sep 12, 2026
14	Woodwill Security Services	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	13 contacts →
	Partial evidence “Welcome to Woodwill Security Services, we provide complete security solutions to our clients.” Source: RevenueBase Database · checked Sep 12, 2026
15	Intraguard Limited	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	12 contacts →
	Partial evidence “Our partnership approach to understanding your security needs and developing a bespoke service enables us to cater to all kinds of security requirements.” Source: RevenueBase Database · checked Sep 12, 2026
16	The Security Group	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	11 contacts →
	Partial evidence “The Security Group delivers state-of-the-art security solutions to protect businesses, assets, and people.” Source: RevenueBase Database · checked Sep 12, 2026
17	Guarding Professionals LTD	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	10 contacts →
	Partial evidence “Guarding Professionals is a customer focused security services company providing cost effective advanced security solutions using technical excellence and superior customer…” Source: RevenueBase Database · checked Sep 12, 2026
18	Lexnis Services Limited	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	10 contacts →
	Strong evidence “Lexnis Services is a multi-faceted Security and Facilities Management provider dedicated to safeguarding business's assets, premises, and staff.” Source: RevenueBase Database · checked Sep 12, 2026
19	Dean Security	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	9 contacts →
	Indirect evidence “We provide a range of services that include but not limited to- Close Protection Operatives - CCTV operators - SIA Door Supervisors - First Aid Staff - Health & Safety Operatives…” Source: RevenueBase Database · checked Sep 12, 2026
20	Delta Security 1962 LTD	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	8 contacts →
	Indirect evidence “Our goal is so simple we can sum it up in one word - quality.” Source: RevenueBase Database · checked Sep 12, 2026
21	Pacific Business Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	8 contacts →
	Partial evidence “We take your security seriously and ensure that you and your property are safe and in secure hands.” Source: RevenueBase Database · checked Sep 12, 2026
22	Buffalo Security LTD	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	6 contacts →
	Partial evidence “A security team needs to do more than just protect your interests; it needs to contribute in raising the standards of the experience that your guests expect (and receive) at your…” Source: RevenueBase Database · checked Sep 12, 2026
23	Poseidon Security Special Services	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	5 contacts →
	Partial evidence “With over 10 years in the security industry, we have built a reputation for reliability, professionalism, and unparalleled customer service.” Source: RevenueBase Database · checked Sep 12, 2026
24	I & S Services LTD	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	4 contacts →
	Indirect evidence “Founded in 2006, I&S has established itself as a trusted agency, building relations with some of the most well respected and high-profile venues and organisations in the…” Source: RevenueBase Database · checked Sep 12, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: facility security management. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names facility security management.
Partial evidence: Its own public description names part of facility security management, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name facility security management. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 24 of 171 facility security management based in London, United Kingdom

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Facility security management based in London, United Kingdom at a glance

As of Sep 12, 2026

16.4%Verified-email coverage

3.5%Mobile-number coverage

16.4Average contacts per company

11-50Median size (employees)

Sep 12, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 14.0d

3940–30

6331–60

261–90

090–180

0180+

Company record updated

Median 78.0d

00–30

70031–60

1,53161–90

44490–180

128180+

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 RevenueBase Smart Search 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 Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in London, 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.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names facility security management), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
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 London 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 its RevenueBase Smart Search 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, 459 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 12, 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

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names facility security management, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

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

RevenueBase identified 171 facility security management headquartered in London, 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 in the United Kingdom has the most facility security management?

London leads the United Kingdom 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 459 verified decision-maker contacts tracked across these 171 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 12, 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 Smart Search, 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.