Company lists · Data refreshed September 2026

Top 25 Private security firms based in the United Kingdom

RevenueBase identified 1,980 private security firms headquartered in the United Kingdom as of September 2026 and tracks 112,249 professional contacts across them, including 3,309 with verified work emails and 8,871 with mobile numbers. London is the largest hub.

This list covers private security firms 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 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.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review
1,980Companies
112,249Contacts tracked
3,309Verified emails
8,871Mobile numbers
Unlock all 1,980 companies Free signup · no credit card · 500 free credits

The 25 largest private security firms based in the United Kingdom

Ranked by team size
Top 25 of 1,980 private security firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names private security firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
G4sPartial evidence
London, United KingdomHQ checked Sep 5, 202610001+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, 2026
2London, United KingdomHQ checked Sep 5, 20265,001-10,0001,451

“TSS is the UK’s largest retail specialist security company, employing over 7500+ security personnel.”

Source: company website · checked Sep 5, 2026
3
CIS Security LimitedPartial evidence
London, United KingdomHQ checked Sep 5, 20261,001-5,000919

“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, 2026
4
Professional SecurityPartial evidence
Leeds, United KingdomHQ checked Sep 5, 20261,001-5,000884

“Professional Security is one of the UK’s leading providers of security services, specialising in the hospitality and events sectors.”

Source: company website · checked Sep 5, 2026
5
VSG Vision Security GroupPartial evidence
Northampton, United KingdomHQ checked Sep 5, 20265,001-10,000852

“VSG are one of the UK's leading security solutions providers with a heritage in manned guarding.”

Source: company website · checked Sep 5, 2026
6
Corps SecurityPartial evidence
London, United KingdomHQ checked Sep 5, 20261,001-5,000847

“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, 2026
7
SecurigroupPartial evidence
United KingdomHQ checked Sep 5, 20261,001-5,000765

“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: company website · checked Sep 5, 2026
8
FGH SecurityIndirect evidence
Manchester, United KingdomHQ checked Sep 5, 20261,001-5,000649

“Established in 2003, FGH are trusted by international brands to keep their assets and millions of people safe every year.”

Source: company website · checked Sep 5, 2026
9
Icts UK & IrelandPartial evidence
London, United KingdomHQ checked Sep 5, 20261,001-5,000597

“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: company website · checked Sep 5, 2026
10
Lodge SecurityPartial evidence
Cirencester, United KingdomHQ checked Sep 5, 20261,001-5,000422

“Unlike traditional security providers, we're redefining what protection means in today's world.”

Source: company website · checked Sep 5, 2026
11
Ward SecurityStrong evidence
London, United KingdomHQ checked Sep 5, 20261,001-5,000419

“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, 2026
12
Ssgc LTDIndirect evidence
Swindon, United KingdomHQ checked Sep 5, 2026501-1,000392

“SSGC is a leading innovator in the Manned Guarding industry, specialising in the application of new technology to improve the performance of its Management team, deployed staff…”

Source: company website · checked Sep 5, 2026
13
Regency SecurityPartial evidence
Braintree, United KingdomHQ checked Sep 5, 20261,001-5,000326

“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 5, 2026
14
SES GroupIndirect evidence
Harlow, United KingdomHQ checked Sep 5, 20261,001-5,000285

“SES Group was founded in 1998 by Dr Tony Ball and rebranded as SES Group in 2014.”

Source: company website · checked Sep 5, 2026
15
First Response GroupPartial evidence
Leeds, United KingdomHQ checked Sep 5, 2026501-1,000246

“First Response Group (FRG) is one of the leading security, risk and FM providers in the UK delivering manned security, technology solutions, building management and vacant…”

Source: company website · checked Sep 5, 2026
16
InterrIndirect evidence
London, United KingdomHQ checked Sep 5, 20261,001-5,000232

“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, 2026
17Bexleyheath, United KingdomHQ checked Sep 5, 2026501-1,000206

“Wise Security is a trusted provider of professional security, crowd management, and safety solutions for high‑profile events, venues, and organisations across the UK.”

Source: company website · checked Sep 5, 2026
18Woking, United KingdomHQ checked Sep 5, 2026201-500205

“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: company website · checked Sep 5, 2026
19Leeds, United KingdomHQ checked Sep 5, 20261,001-5,000180

“Established in 1978, Bridgegate Security is proud to be one of the UK’s largest independent security contractors.”

Source: company website · checked Sep 5, 2026
20Middx, United KingdomHQ checked Sep 5, 2026201-500175

“We are able to supply a one stop security service for all types of security requirement.”

Source: company website · checked Sep 5, 2026
21
Guarding UKIndirect evidence
Enfield, United KingdomHQ checked Sep 5, 2026501-1,000166

“We are GUK.”

Source: company website · checked Sep 5, 2026
22
The Brooknight GroupPartial evidence
Milton Keynes, United KingdomHQ checked Sep 5, 2026201-500166

“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: company website · checked Sep 5, 2026
23Sidcup, United KingdomHQ checked Sep 5, 2026201-500166

“Trigion Security Services is the UK provider of Security Guarding and Technical Solutions for Facilicom UK.”

Source: company website · checked Sep 5, 2026
24
Premium Security ServicesPartial evidence
Acton, United KingdomHQ checked Sep 5, 202611-50148

“Premium Security Services (PSS) delivers expert security solutions across the leisure, retail, and commercial sectors.”

Source: company website · checked Sep 5, 2026
25
Dardan SecurityIndirect evidence
Cambridge, United KingdomHQ checked Sep 5, 2026201-500141

“Established in 1973, we have been protecting brands and businesses for over 40 years.”

Source: company website · checked Sep 5, 2026

Showing 25 of 1,980 private security firms based in the United Kingdom

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Private security firms based in the United Kingdom at a glance

As of Sep 5, 2026
11-50Median size (employees)
LondonLargest hub · 549 HQs
8,871Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
667
11-50
624
51-200
466
201-500
136
501-1,000
34
1,001-5,000
28
5,001-10,000
5
10001+
6

Verified emails by last verification

0–30
3,082
31–60
208
61–90
2
90–180
0
180+
17

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 the 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 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, 3,309 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.

Frequently asked

How many private security firms are there based in the United Kingdom?

RevenueBase identified 1,980 private security firms 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 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 3,309 verified decision-maker contacts tracked across these 1,980 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.