Company lists · Data refreshed September 2026
Top 23 Security companies based in London, United Kingdom
This directory lists 909 security companies based in London, United Kingdom, with 92,118 contacts and 1,909 email addresses for business research and outreach. As of September 2026, London is the single most-represented city among the companies on the list.
Security companies provide services, systems, or products that protect people, property, facilities, data, networks, or other assets from security threats. This list covers companies that provide security products or services, including physical security, cybersecurity, monitoring, access control, risk management, and related protection solutions. Ranked by team size, largest first. Data current as of September 6, 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 security companies 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 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | TSS Total Security Services LTDStrong evidence | 1,451 | |||
“TSS is the UK’s largest retail specialist security company, employing over 7500+ security personnel.” Source: company website · checked Sep 6, 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 6, 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 6, 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 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 325 | ||||
“Security.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | VPS Uk&iStrong evidence | 272 | |||
“VPS is Europe’s leading temporary security specialist, protecting vacant properties, remote sites, construction and infrastructure projects with tailored, risk-based security…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | Universal SecurityStrong evidence | 257 | |||
“Our roots in security date back to 1994.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | 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 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | 163 | ||||
“Get Licensed is the UK's leading provider of security training, screening, and staffing solutions.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | QCICStrong evidence | 159 | |||
“QCIC is an award-winning global engineering firm specialising in designing, building and running security systems.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 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 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | 133 | ||||
“Vigilant Security provides a range of services including keyholding, corporate security, event security, mobile patrols as well as specialist services throughout the UK.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 124 | ||||
“CGS is a dynamic and professional FM company, specialising in customer focussed security provisions and cleaning specialists.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 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 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | Lead Element Security GroupStrong evidence | 75 | |||
“We are Veteran Owned, Veteran Operated Security company based in London (HQ), with operation nationwide.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | 71 | ||||
“KK Security was established in 2014 with the goal of keeping people safe.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | 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 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | 63 | ||||
“Vigilance is a pioneering security company with a proud military heritage.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | RED Snapper GroupStrong evidence | 62 | |||
“We are experts in the Public Safety and Enterprise Security sectors.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | WLSStrong evidence | 61 | |||
“WLS (West London Security) has been providing security and solutions to London's homes and businesses for over 40 years.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | 58 | ||||
“Black Diamond Security - Safeguarding Your World.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | 51 | ||||
“Established in Custom Intelligent Security is a technology driven ISO27001 & NSi Gold Accredited independent electronic security specialist with a proven track record of…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 23 of 909 security companies based in London, United Kingdom
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Security companies based in London, United Kingdom at a glance
As of Sep 6, 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 909 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 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 “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 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, 1,909 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 6, 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 companies by metro in the United Kingdom
- Security companies in London909
- Security companies in Manchester122
- Security companies in Birmingham108
- Security companies in Glasgow64
- Security companies in Leeds64
- Security companies in Bristol60
- Security companies in Liverpool48
- Security companies in Leicester37
- Security companies in Cardiff35
- Security companies in Belfast33
- Security companies in Nottingham33
- Security companies in Sheffield32
- Security companies in Ilford30
- Security companies in Southampton30
- Security companies in Luton29
- Security companies in Bradford27
- Security companies in Northampton25
Frequently asked
How many security companies are based in London, United Kingdom?
RevenueBase counts 909 security companies based in London, United Kingdom on this list.
How many contacts and email addresses are available for security companies?
The list includes 92,118 contacts and 1,909 email addresses for security companies.
Which city has the most security companies on the list?
London is the single most-represented city among the companies on the list.
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Security companies by geography
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- Security companies based in the Netherlands
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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.