Company lists · Data refreshed September 2026

Top 23 Private security companies based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 439 companies tracked

RevenueBase identified 439 private security companies headquartered in London, United Kingdom as of September 2026 and tracks 6,830 professional contacts across them, including 723 with verified work emails. London is the largest hub.

This list covers private security companies 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, 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

439Companies

6,830Contacts tracked

723Verified emails

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The 23 largest private security companies based in London, United Kingdom

Ranked by team size

Top 23 of 439 private security companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names private 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.
#	Company	Headquarters	Employees	Contacts
1	TSS Total Security Services LTDPartial evidence	London, United KingdomHQ checked Sep 5, 2026	5,001-10,000	1,451
	“TSS is the UK’s largest retail specialist security company, employing over 7500+ security personnel.” Source: company website · checked Sep 5, 2026
2	CIS Security LimitedPartial evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	919
	“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
3	Ward SecurityStrong evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	419
	“Ward is an award winning, privately owned business, providing bespoke risk and security solutions including protective security personnel, explosive search dogs, narcotic search…” Source: company website · checked Sep 5, 2026
4	InterrIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	232
	“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
5	The Keyholding CompanyPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	137
	“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
6	Servoca Secure Solutions LimitedPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	85
	“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
7	Lead Element Security GroupPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	75
	“We are Veteran Owned, Veteran Operated Security company based in London (HQ), with operation nationwide.” Source: company website · checked Sep 5, 2026
8	City Security Services Part Of City Group SecurityPartial evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	64
	“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
9	Vigilance Certified B CorpPartial evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	63
	“Vigilance is a pioneering security company with a proud military heritage.” Source: company website · checked Sep 5, 2026
10	RED Snapper GroupPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	62
	“We are experts in the Public Safety and Enterprise Security sectors.” Source: company website · checked Sep 5, 2026
11	Black Diamond SecurityPartial evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	58
	“Black Diamond Security - Safeguarding Your World.” Source: company website · checked Sep 5, 2026
12	Frankton Group LTDIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	48
	“In today’s complex threat environment, businesses, individuals, and organisations require trusted partners to provide the ultimate assurance that their assets are well protected.” Source: company website · checked Sep 5, 2026
13	UK Protection LTDPartial evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	45
	“UK Protection is widely recognised as the premier supplier of security solutions to the Corporate, Jewellery and Luxury Retail industries across the UK.” Source: company website · checked Sep 5, 2026
14	Ak9 Security And FM Solutions LTDPartial evidence	London, United KingdomHQ checked Sep 5, 2026	501-1,000	43
	“AK9 Security and FM Solutions offers comprehensive security solutions for businesses, governmental organizations, and residential areas.” Source: company website · checked Sep 5, 2026
15	Gratte Brothers Security Systems & SoftwarePartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	39
	“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: company website · checked Sep 5, 2026
16	BML GroupPartial evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	37
	“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: company website · checked Sep 5, 2026
17	Team Fusion LTDPartial evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	34
	“Our elite teams offer bespoke, integrated security solutions that adapt and react to the evolving threat landscape.” Source: company website · checked Sep 5, 2026
18	Systematic Security LTDPartial evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	31
	“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: company website · checked Sep 5, 2026
19	AccoladeStrong evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	30
	“Supplier of professional, high quality Security Guarding services-Corporate, retail and event security services-public and private function security-provision of Door Supervisors…” Source: company website · checked Sep 5, 2026
20	CapstarStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	30
	“Capstar provides technology-enabled threat, risk and security services to private and corporate clients.” Source: company website · checked Sep 5, 2026
21	Priavo SecurityPartial evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	28
	“Priavo Security Group is an established provider of comprehensive security risk management, dedicated to safeguarding individuals, information, assets, and reputation through…” Source: company website · checked Sep 5, 2026
22	The Portmarnock GroupPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	19
	“The Portmarnock Group was built from years of experience, hard work and a genuine passion for doing security differently.” Source: company website · checked Sep 5, 2026
23	M4 Security Group LimitedIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	19
	“Established in 2016 with a strong vision for safety and protection.” Source: company website · checked Sep 5, 2026

Showing 23 of 439 private security companies based in London, United Kingdom

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Private security companies based in London, United Kingdom at a glance

As of Sep 5, 2026

11-50Median size (employees)

LondonLargest hub · 439 HQs

Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

131

11-50

142

51-200

117

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for London, over 439 companies.

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 private 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 London, United Kingdom whose own description of what they do matches “private 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 private security companies, 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 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, 723 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.

Private security companies by metro in the United Kingdom

Private security companies in London439
Private security companies in Birmingham42
Private security companies in Manchester36

Frequently asked

How many private security companies are there based in London, United Kingdom?

RevenueBase identified 439 private security companies 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?

TSS Total Security Services LTD, headquartered in London, tops this list with the largest team on record.

Which city has the most private security companies?

London leads with 439 headquartered companies, followed by Birmingham (42) and Manchester (36).

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 723 verified decision-maker contacts tracked across these 439 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.