Company lists · Data refreshed September 2026

Top 24 Security agencies based in London, United Kingdom

Name: Security agencies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 472 companies tracked

RevenueBase identified 472 security agencies headquartered in London, United Kingdom as of September 2026 and tracks 103,211 professional contacts across them, including 1,025 with verified work emails. London is the largest hub.

This list covers security agencies 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 21, 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 21, 2026 86% judged on-target in blind review

472Companies

103,211Contacts tracked

1,025Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 24 largest security agencies based in London, United Kingdom

Ranked by team size

Top 24 of 472 security agencies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to security agencies: 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	G4s	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	10001+	79,699 contacts →
	Strong evidence “G4S is a leading security and facility services company that provides proactive security services and cutting-edge smart technology to deliver tailored, integrated security…” Source: RevenueBase Database · checked Sep 21, 2026
2	TSS Total Security Services LTD	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	5,001-10,000	1,451 contacts →
	Strong evidence “TSS is the UK’s largest retail specialist security company, employing over 7500+ security personnel.” Source: RevenueBase Database · checked Sep 21, 2026
3	CIS Security Limited	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	1,001-5,000	919 contacts →
	Strong 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 21, 2026
4	Ward Security	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	1,001-5,000	419 contacts →
	Strong evidence “Ward is an award winning, privately owned business, providing bespoke risk and security solutions including protective security personnel, explosive search dogs, narcotic search…” Source: RevenueBase Database · checked Sep 21, 2026
5	Interr	Indirect evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
6	The Keyholding Company	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	137 contacts →
	Strong 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 21, 2026
7	Servoca Secure Solutions Limited	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	85 contacts →
	Strong 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 21, 2026
8	Lead Element Security Group	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	75 contacts →
	Strong evidence “We are Veteran Owned, Veteran Operated Security company based in London (HQ), with operation nationwide.” Source: RevenueBase Database · checked Sep 21, 2026
9	Saladin Security	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	64 contacts →
	Strong evidence “Saladin is a security services and risk management company, operating mainly in complex and unstable regions of the world.” Source: RevenueBase Database · checked Sep 21, 2026
10	City Security Services Part Of City Group Security	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	64 contacts →
	Strong 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 21, 2026
11	Vigilance Certified B Corp	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	63 contacts →
	Strong evidence “Vigilance is a pioneering security company with a proud military heritage.” Source: RevenueBase Database · checked Sep 21, 2026
12	Black Diamond Security	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	58 contacts →
	Strong evidence “Black Diamond Security - Safeguarding Your World.” Source: RevenueBase Database · checked Sep 21, 2026
13	GSA Global	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	49 contacts →
	Strong evidence “GSA Global helps organisations, families and individuals respond to serious, complex and emerging security risks.” Source: RevenueBase Database · checked Sep 21, 2026
14	Frankton Group LTD	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	48 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 21, 2026
15	UK Protection LTD	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	45 contacts →
	Strong 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 21, 2026
16	Ak9 Security And FM Solutions LTD	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	43 contacts →
	Strong evidence “AK9 Security and FM Solutions offers comprehensive security solutions for businesses, governmental organizations, and residential areas.” Source: RevenueBase Database · checked Sep 21, 2026
17	Pathway Risk Management	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	40 contacts →
	Strong evidence “Pathway Risk Management delivers risk-led security and resilience solutions to organisations across the UK and internationally.” Source: RevenueBase Database · checked Sep 21, 2026
18	MY Local Bobby	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	39 contacts →
	Indirect evidence “Creating Safe And Secure Neighbourhoods.” Source: RevenueBase Database · checked Sep 21, 2026
19	BML Group	Strong evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
20	HAROD	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	36 contacts →
	Strong evidence “Harod Associates delivers global investigation and security solutions to complex crime and risk issues.” Source: RevenueBase Database · checked Sep 21, 2026
21	Team Fusion LTD	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	34 contacts →
	Strong evidence “Our elite teams offer bespoke, integrated security solutions that adapt and react to the evolving threat landscape.” Source: RevenueBase Database · checked Sep 21, 2026
22	Systematic Security LTD	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	31 contacts →
	Strong 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 21, 2026
23	Accolade	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	30 contacts →
	Strong 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 21, 2026
24	Capstar	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	30 contacts →
	Strong evidence “Capstar provides technology-enabled threat, risk and security services to private and corporate clients.” Source: RevenueBase Database · checked Sep 21, 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: security agencies. 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 security agencies.
Partial evidence: Its own public description names part of security agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name security agencies. 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 472 security agencies based in London, United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 1,025 reachable decision-makers.

Free signup · no credit card

View the full list →

Security agencies based in London, United Kingdom at a glance

As of Sep 21, 2026

1.0%Verified-email coverage

218.7Average contacts per company

11-50Median size (employees)

100.0%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

160

11-50

147

51-200

116

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 for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 472 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 security agencies, 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 “security agencies”. 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 security agencies), 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 security agencies, 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, 1,025 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 21, 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.

Security agencies by metro in the United Kingdom

Security agencies in London472
Security agencies in Birmingham37
Security agencies in Manchester34

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 security agencies, 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 security agencies are there based in London, United Kingdom?

RevenueBase identified 472 security agencies 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?

G4s, headquartered in London, tops this list with the largest team on record.

Which city has the most security agencies?

London leads with 472 headquartered companies, followed by Birmingham (37) and Manchester (34).

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 1,025 verified decision-maker contacts tracked across these 472 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 21, 2026.

Ready to reach these companies? Verified emails and direct dials for all 472 security agencies based in London, United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Security agencies by geography

Browse the directory

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.