Company lists · Data refreshed September 2026

Top 23 Commercial security services based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 8, 2026 430 companies tracked

RevenueBase identified 430 commercial security services headquartered in London, United Kingdom as of September 2026 and tracks 5,528 professional contacts across them, including 759 with verified work emails and 175 with mobile numbers. London is the largest hub.

This list covers commercial security services 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 8, 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 8, 2026 86% judged on-target in blind review

430Companies

5,528Contacts tracked

759Verified emails

175Mobile numbers

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The 23 largest commercial security services based in London, United Kingdom

Ranked by team size

Top 23 of 430 commercial security services based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 8, 2026. RevenueBase Smart Search rates how each company's information relates to commercial security services: 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 8, 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 8, 2026
2	Corps Security	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	1,001-5,000	847 contacts →
	Partial evidence “Corps Security - experts in security with social value Built on over 165 years of experience, Corps provides specialist security services, across the UK, to ensure the safety of…” Source: RevenueBase Database · checked Sep 8, 2026
3	Interr	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	1,001-5,000	232 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 8, 2026
4	The Keyholding Company	Partial evidence	London, United KingdomHQ checked Sep 8, 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 8, 2026
5	Vigilant Security	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	1,001-5,000	133 contacts →
	Partial evidence “Vigilant Security provides a range of services including keyholding, corporate security, event security, mobile patrols as well as specialist services throughout the UK.” Source: RevenueBase Database · checked Sep 8, 2026
6	Servoca Secure Solutions Limited	Partial evidence	London, United KingdomHQ checked Sep 8, 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 8, 2026
7	City Security Services Part Of City Group Security	Partial evidence	London, United KingdomHQ checked Sep 8, 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 8, 2026
8	Vigilance Certified B Corp	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	201-500	63 contacts →
	Partial evidence “Vigilance is a pioneering security company with a proud military heritage.” Source: RevenueBase Database · checked Sep 8, 2026
9	WLS	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	61 contacts →
	Partial evidence “WLS (West London Security) has been providing security and solutions to London's homes and businesses for over 40 years.” Source: RevenueBase Database · checked Sep 8, 2026
10	Black Diamond Security	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	201-500	58 contacts →
	Partial evidence “Black Diamond Security - Safeguarding Your World.” Source: RevenueBase Database · checked Sep 8, 2026
11	Custom Intelligent Security	Partial evidence	London, United KingdomHQ checked Sep 8, 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 8, 2026
12	UK Protection LTD	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	201-500	45 contacts →
	Partial evidence “UK Protection is widely recognised as the premier supplier of security solutions to the Corporate, Jewellery and Luxury Retail industries across the UK.” Source: RevenueBase Database · checked Sep 8, 2026
13	Ak9 Security And FM Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 8, 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 8, 2026
14	Gratte Brothers Security Systems & Software	Partial evidence	London, United KingdomHQ checked Sep 8, 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 8, 2026
15	Universal Security Systems LTD	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	39 contacts →
	Partial evidence “Universal Security Systems Limited is a specialist provider of installation and maintenance services for all types of security systems including Access Control, Closed Circuit…” Source: RevenueBase Database · checked Sep 8, 2026
16	BML Group	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	37 contacts →
	Partial 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 8, 2026
17	Systematic Security LTD	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	201-500	31 contacts →
	Partial evidence “Systematic Security deliver static manned guarding, mobile patrols, open and lock ups, keyholding and emergency response requirements as well as Vacant Property inspections to a…” Source: RevenueBase Database · checked Sep 8, 2026
18	Accolade	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	201-500	30 contacts →
	Partial evidence “Supplier of professional, high quality Security Guarding services-Corporate, retail and event security services-public and private function security-provision of Door Supervisors…” Source: RevenueBase Database · checked Sep 8, 2026
19	DS Security Group LTD	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	27 contacts →
	Partial evidence “CCTV and Access Control Service and installation specialists Established in 1993 DS Security prides itself on customer service.” Source: RevenueBase Database · checked Sep 8, 2026
20	Welcome Gate	Partial evidence	London, United KingdomHQ checked Sep 8, 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 8, 2026
21	Dennis Johns Service Group	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	20 contacts →
	Indirect evidence “The Dennis Johns Service Group is a forward thinking group of companies providing, Electrical, CCTV and Access Control, installation and maintenance contracting services.” Source: RevenueBase Database · checked Sep 8, 2026
22	The Portmarnock Group	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	19 contacts →
	Partial evidence “The Portmarnock Group was built from years of experience, hard work and a genuine passion for doing security differently.” Source: RevenueBase Database · checked Sep 8, 2026
23	STN Security Services LTD	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	18 contacts →
	Partial evidence “Although STN is essentially London based we provide security services throughout mainland UK.” Source: RevenueBase Database · checked Sep 8, 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: commercial security services. 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 commercial security services.
Partial evidence: Its own public description names part of commercial security services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name commercial security services. 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 23 of 430 commercial security services based in London, United Kingdom

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Commercial security services based in London, United Kingdom at a glance

As of Sep 8, 2026

13.7%Verified-email coverage

3.2%Mobile-number coverage

12.9Average contacts per company

11-50Median size (employees)

97.4%Largest-city concentration · London

Sep 8, 2026Page data refreshed

Companies by employee count

1-10

151

11-50

138

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 10.0d

6970–30

6231–60

061–90

090–180

0180+

Company record updated

Median 75.0d

00–30

1,71231–60

3,07461–90

50490–180

238180+

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 commercial security services, 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 “commercial security services”. 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 commercial security services), 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 commercial security services, 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, 759 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 8, 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.

Commercial security services by metro in the United Kingdom

Commercial security services in London419
Commercial security services in Birmingham64
Commercial security services in Manchester62
Commercial security services in Leeds39
Commercial security services in Liverpool28
Commercial security services in Bristol26

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 commercial security services, 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 commercial security services are there based in London, United Kingdom?

RevenueBase identified 430 commercial security services 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 has the most commercial security services?

London leads with 419 headquartered companies, followed by Birmingham (64) and Manchester (62).

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 759 verified decision-maker contacts tracked across these 430 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 8, 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.