Company lists · Data refreshed September 2026

Top 25 Private security contractors based in the United Kingdom

Name: Private security contractors based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 1,762 companies tracked

RevenueBase identified 1,762 private security contractors headquartered in the United Kingdom as of September 2026 and tracks 104,740 professional contacts across them, including 2,753 with verified work emails. London is the largest hub.

This list covers private security contractors 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, 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

1,762Companies

104,740Contacts tracked

2,753Verified emails

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The 25 largest private security contractors based in the United Kingdom

Ranked by team size

Top 25 of 1,762 private security contractors based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to private security contractors: 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	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	10001+	79,699 contacts →
	Partial 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	CIS Security Limited	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	1,001-5,000	919 contacts →
	Partial 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
3	Professional Security	Partial evidence	Leeds, United KingdomHQ checked Sep 21, 2026	1,001-5,000	884 contacts →
	Partial evidence “Professional Security is one of the UK’s leading providers of security services, specialising in the hospitality and events sectors.” Source: RevenueBase Database · checked Sep 21, 2026
4	Securigroup	Partial evidence	United KingdomHQ checked Sep 21, 2026	1,001-5,000	765 contacts →
	Partial evidence “Ranked in the top 1% of UK security companies, as approved by the Security Industry Authority, SecuriGroup is an award-winning security company, specialising in the provision of…” Source: RevenueBase Database · checked Sep 21, 2026
5	FGH Security	Indirect evidence	Manchester, United KingdomHQ checked Sep 21, 2026	1,001-5,000	649 contacts →
	Indirect evidence “Established in 2003, FGH are trusted by international brands to keep their assets and millions of people safe every year.” Source: RevenueBase Database · checked Sep 21, 2026
6	Icts UK & Ireland	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	1,001-5,000	597 contacts →
	Partial evidence “Part of ICTS Europe Group, ICTS UK & Ireland is a professional services firm which has been specialised in security risk for the past 39+ years.” Source: RevenueBase Database · checked Sep 21, 2026
7	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
8	Regency Security	Partial evidence	Braintree, United KingdomHQ checked Sep 21, 2026	1,001-5,000	326 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 21, 2026
9	Pilgrims Risk Management Group	Partial evidence	Woking, United KingdomHQ checked Sep 21, 2026	201-500	205 contacts →
	Partial evidence “Pilgrims are a global security, risk management and service support company that identifies and manages risks for clients across all sectors, including oil & gas, telecoms…” Source: RevenueBase Database · checked Sep 21, 2026
10	Bridgegate Security UK Limited	Strong evidence	Leeds, United KingdomHQ checked Sep 21, 2026	1,001-5,000	180 contacts →
	Strong evidence “Established in 1978, Bridgegate Security is proud to be one of the UK’s largest independent security contractors.” Source: RevenueBase Database · checked Sep 21, 2026
11	Unitrust Protection Services	Partial evidence	Middx, United KingdomHQ checked Sep 21, 2026	201-500	175 contacts →
	Partial evidence “We are able to supply a one stop security service for all types of security requirement.” Source: RevenueBase Database · checked Sep 21, 2026
12	Guarding UK	Indirect evidence	Enfield, United KingdomHQ checked Sep 21, 2026	501-1,000	166 contacts →
	Indirect evidence “We are GUK.” Source: RevenueBase Database · checked Sep 21, 2026
13	The Brooknight Group	Partial evidence	Milton Keynes, United KingdomHQ checked Sep 21, 2026	201-500	166 contacts →
	Partial evidence “Providing Exceptional Security Services to Corporate and Retail Customers - Brooknight Security, with over 30 years of experience, is the go-to choice for businesses seeking…” Source: RevenueBase Database · checked Sep 21, 2026
14	Trigion Security Services LTD	Partial evidence	Sidcup, United KingdomHQ checked Sep 21, 2026	201-500	166 contacts →
	Partial evidence “Trigion Security Services is the UK provider of Security Guarding and Technical Solutions for Facilicom UK.” Source: RevenueBase Database · checked Sep 21, 2026
15	Premium Security Services	Partial evidence	Acton, United KingdomHQ checked Sep 21, 2026	11-50	148 contacts →
	Partial evidence “Premium Security Services (PSS) delivers expert security solutions across the leisure, retail, and commercial sectors.” Source: RevenueBase Database · checked Sep 21, 2026
16	Dardan Security	Indirect evidence	Cambridge, United KingdomHQ checked Sep 21, 2026	201-500	141 contacts →
	Indirect evidence “Established in 1973, we have been protecting brands and businesses for over 40 years.” Source: RevenueBase Database · checked Sep 21, 2026
17	The Keyholding Company	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	137 contacts →
	Partial 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
18	Kingdom Security Services	Partial evidence	Newton-le-willows, United KingdomHQ checked Sep 21, 2026	5,001-10,000	126 contacts →
	Partial evidence “About Kingdom Security Established in March 1993, Kingdom Security is a leading UK security provider delivering professional, fully licensed security services nationwide.” Source: RevenueBase Database · checked Sep 21, 2026
19	Solace Global	Indirect evidence	Poole, United KingdomHQ checked Sep 21, 2026	201-500	115 contacts →
	Indirect evidence “Solace Global Risk began in 2010 with a simple belief: when people face risk, they need partners who act quickly and stand by their word.” Source: RevenueBase Database · checked Sep 21, 2026
20	Guardforce Security Limited	Partial evidence	Hornchurch, United KingdomHQ checked Sep 21, 2026	501-1,000	111 contacts →
	Partial evidence “We are a well-established company that supplies specialist Close Protection, Door Supervisor services to Private Individuals, Visiting Royal Families, Government Officials…” Source: RevenueBase Database · checked Sep 21, 2026
21	City Security	Partial evidence	Plympton, United KingdomHQ checked Sep 21, 2026	51-200	105 contacts →
	Partial evidence “City Security understands that our staff are the first and last person a patron encounters on their visit to a venue.” Source: RevenueBase Database · checked Sep 21, 2026
22	Rossi Security	Partial evidence	Mayfair, United KingdomHQ checked Sep 21, 2026	201-500	98 contacts →
	Partial evidence “Rossi Security have been providing Luxury Security services in London and Bicester Village, Oxfordshire since 2009.” Source: RevenueBase Database · checked Sep 21, 2026
23	Octavian Security	Partial evidence	Bingham, United KingdomHQ checked Sep 21, 2026	201-500	91 contacts →
	Partial evidence “Octavian Security is part of the Octavian Group, a global leader delivering integrated solutions across security, facilities management, and technology-led services.” Source: RevenueBase Database · checked Sep 21, 2026
24	K4 Security - K4 Group	Partial evidence	Hounslow, United KingdomHQ checked Sep 21, 2026	201-500	89 contacts →
	Partial evidence “For a better service and competitive price try K4 Security Services At K4 we offer the following: 1.” Source: RevenueBase Database · checked Sep 21, 2026
25	Croma Security Solutions Group PLC Cssg	Partial evidence	Whiteley, United KingdomHQ checked Sep 21, 2026	501-1,000	87 contacts →
	Partial evidence “Croma Security Solutions Group (CSSG) began in 1970 as a family-run business in Shirley, Southampton, known as County Locksmiths.” 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: private security contractors. 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 private security contractors.
Partial evidence: Its own public description names part of private security contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name private security contractors. 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 25 of 1,762 private security contractors based in the United Kingdom

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Private security contractors based in the United Kingdom at a glance

As of Sep 21, 2026

2.6%Verified-email coverage

59.4Average contacts per company

11-50Median size (employees)

28.4%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

633

11-50

552

51-200

399

201-500

107

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 1,762 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 contractors, 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 the United Kingdom whose own description of what they do matches “private security contractors”. 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 private security contractors), 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 private security contractors, 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 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, 2,753 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.

Private security contractors by metro

Private security contractors in London500
Private security contractors in Manchester39
Private security contractors in Birmingham37

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 private security contractors, 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 private security contractors are there based in the United Kingdom?

RevenueBase identified 1,762 private security contractors 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?

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

Which city has the most private security contractors?

London leads with 500 headquartered companies, followed by Manchester (39) and Birmingham (37).

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 2,753 verified decision-maker contacts tracked across these 1,762 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.

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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 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.