Company lists · Data refreshed September 2026
Top 25 Government contract security companies based in the United Kingdom
RevenueBase identified 266 government contract security companies headquartered in the United Kingdom as of September 2026 and tracks 3,436 professional contacts across them, including 293 with verified work emails and 181 with mobile numbers. London is the largest hub.
This list covers government contract security companies headquartered in the 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 3, 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 25 largest government contract security companies based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 325 | ||||
“Established in 1993, with commitment to our customers and staff alongside a strong ethos and standards driven approach, Regency Security is now the largest provider of door…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 2 | 125 | ||||
“Vespasian Security was formed in February 2006.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 3 | 124 | ||||
“About Kingdom Security Established in March 1993, Kingdom Security is a leading UK security provider delivering professional, fully licensed security services nationwide.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 4 | 91 | ||||
“The multi award winning Octavian is one of the world's fastest growing, most forward thinking security and facilities management led businesses.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 5 | 90 | ||||
“For a better service and competitive price try K4 Security Services At K4 we offer the following: 1.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 6 | 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 3, 2026Thanks. The Data Team will review it. | |||||
| 7 | 70 | ||||
“Northern Security Ltd is a leading guarding, alarm response and electronic security business operating throughout the North of England and South West Scotland.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 8 | 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 3, 2026Thanks. The Data Team will review it. | |||||
| 9 | 62 | ||||
“Black Diamond Security - Safeguarding Your World.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 10 | 58 | ||||
“Sentinel Group Security is a fast growing provider of all aspects of security personnel and manned security services operating across the United Kingdom.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 11 | 44 | ||||
“Design, install and maintain CCTV Systems Intruder Systems Access Control Manned Security Guarding Event Stewarding Construction Cleaning Commercial Cleaning Builders & Sparkle…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 12 | 43 | ||||
“All in Black are an accredited security solutions provider with over 20 years’ experience at the highest level across the UK.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 13 | 43 | ||||
“AK9 Security and FM Solutions offers comprehensive security solutions for businesses, governmental organizations, and residential areas.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 14 | 40 | ||||
“4 Site Security have specialised in providing professional security services to clients throughout the North of England for over 23 Years.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 15 | 33 | ||||
“At Leisure Guard Security, we provide a wide range of security services to private individuals and corporate businesses alike.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 16 | 32 | ||||
“Oak Security Services was founded in July 2015 and is now one of the fastest growing security companies in the UK.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 17 | 32 | ||||
“Security Specialists A discreet, reliable and effective service Providing highly trained professional security guards and associated round the clock security services and for over…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 18 | 32 | ||||
“At Samson Security Fire & Facilities, we provide integrated security, fire protection, and facilities management solutions designed to keep people, property, and operations safe…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 19 | 31 | ||||
“At Herongrange we pride ourselves in delivering our products and services to the highest possible standards.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 20 | Systematic Security LTDPartial evidence | 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 3, 2026Thanks. The Data Team will review it. | |||||
| 21 | 27 | ||||
“Eboracum was founded in 2011 and established in York by local-lad and former North Yorkshire Police Constable Carl Nickson.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 22 | 25 | ||||
“We deliver professional, accredited security services that protect people, property, and organisations across the UK.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 23 | 24 | ||||
“Close Protection Security is an industry-leading security company, established in 2017 and based in the North East of England, created by Glenn Bartlett.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 24 | 21 | ||||
“Classic Security was founded in 1947 by Fredrick Townsley - the father of our chairman and the grandfather of our MD.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 25 | Secured Security Solutions LimitedIndirect evidence | 20 | |||
Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 266 government contract security companies based in the United Kingdom
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Government contract security companies based in the United Kingdom at a glance
As of Sep 3, 2026Companies by employee count
Verified emails by last verification
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 government contract 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 the United Kingdom whose own description of what they do matches “government contract 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 government contract security companies, and records with no verified work email. Companies headquartered outside United Kingdom 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, 293 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 3, 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.
Government contract security companies by metro
- Government contract security companies in London68
Frequently asked
How many government contract security companies are there based in the United Kingdom?
RevenueBase identified 266 government contract security companies headquartered in the 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?
Regency Security, headquartered in Braintree, tops this list with the largest team on record.
Which city has the most government contract security companies?
London leads with 68 headquartered companies, followed by Manchester (12) and Birmingham (12).
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 293 verified decision-maker contacts tracked across these 266 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 3, 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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