Company lists · Data refreshed September 2026
Top 23 Private security firms based in London, United Kingdom
RevenueBase identified 549 private security firms headquartered in London, United Kingdom as of September 2026 and tracks 88,317 professional contacts across them, including 1,094 with verified work emails. London is the largest hub.
This list covers private security firms 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.
The 23 largest private security firms based in London, United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 79,699 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | TSS Total Security Services LTDPartial evidence | 1,451 | |||
“TSS is the UK’s largest retail specialist security company, employing over 7500+ security personnel.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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, 2026Thanks. The Data Team will review it. | |||||
| 4 | 847 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 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, 2026Thanks. The Data Team will review it. | |||||
| 6 | 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, 2026Thanks. The Data Team will review it. | |||||
| 7 | 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, 2026Thanks. The Data Team will review it. | |||||
| 8 | 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, 2026Thanks. The Data Team will review it. | |||||
| 9 | Lead Element Security GroupPartial evidence | 75 | |||
“We are Veteran Owned, Veteran Operated Security company based in London (HQ), with operation nationwide.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 71 | ||||
“KK Security was established in 2014 with the goal of keeping people safe.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | Saladin SecurityPartial evidence | 64 | |||
“Saladin is a security services and risk management company, operating mainly in complex and unstable regions of the world.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 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, 2026Thanks. The Data Team will review it. | |||||
| 13 | 63 | ||||
“Vigilance is a pioneering security company with a proud military heritage.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 58 | ||||
“Black Diamond Security - Safeguarding Your World.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | GSA GlobalPartial evidence | 49 | |||
“GSA Global helps organisations, families and individuals respond to serious, complex and emerging security risks.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 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, 2026Thanks. The Data Team will review it. | |||||
| 17 | 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, 2026Thanks. The Data Team will review it. | |||||
| 18 | 43 | ||||
“AK9 Security and FM Solutions offers comprehensive security solutions for businesses, governmental organizations, and residential areas.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | 40 | ||||
“Pathway Risk Management delivers risk-led security and resilience solutions to organisations across the UK and internationally.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | 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, 2026Thanks. The Data Team will review it. | |||||
| 21 | 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, 2026Thanks. The Data Team will review it. | |||||
| 22 | HARODPartial evidence | 36 | |||
“Harod Associates delivers global investigation and security solutions to complex crime and risk issues.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | Team Fusion LTDPartial evidence | 34 | |||
“Our elite teams offer bespoke, integrated security solutions that adapt and react to the evolving threat landscape.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 23 of 549 private security firms based in London, United Kingdom
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Private security firms based in London, United Kingdom at a glance
As of Sep 5, 2026Companies by employee count
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 549 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 firms, 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 firms”. 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 firms, 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, 1,094 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 firms by metro in the United Kingdom
- Private security firms in London549
- Private security firms in Birmingham45
- Private security firms in Manchester45
- Private security firms in Leeds29
- Private security firms in Liverpool26
Frequently asked
How many private security firms are there based in London, United Kingdom?
RevenueBase identified 549 private security firms 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 private security firms?
London leads with 549 headquartered companies, followed by Birmingham (45) and Manchester (45).
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 1,094 verified decision-maker contacts tracked across these 549 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.
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