Company lists · Data refreshed September 2026

Top 25 Sf security companies based in the United Kingdom

Name: Sf security companies 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 1,408 companies tracked

RevenueBase identified 1,408 sf security companies headquartered in the United Kingdom as of September 2026 and tracks 18,413 professional contacts across them, including 2,089 with verified work emails. London is the largest hub.

This list covers sf 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, 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

1,408Companies

18,413Contacts tracked

2,089Verified emails

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The 25 largest sf security companies based in the United Kingdom

Ranked by team size

Top 25 of 1,408 sf security companies 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 sf security companies: 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	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
2	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
3	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
4	Interr	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	1,001-5,000	232 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 21, 2026
5	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
6	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
7	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
8	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
9	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
10	Total Security Protection LTD	Partial evidence	Watford, United KingdomHQ checked Sep 21, 2026	51-200	116 contacts →
	Partial evidence “TSP has a reputation for providing enterprise security solutions, as well as excellent system integration standards and exceptional aftercare support, since its founding in 1988.” Source: RevenueBase Database · checked Sep 21, 2026
11	Guardforce Security Limited	Indirect evidence	Hornchurch, United KingdomHQ checked Sep 21, 2026	501-1,000	111 contacts →
	Indirect 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
12	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
13	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
14	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
15	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
16	Servoca Secure Solutions Limited	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	85 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 21, 2026
17	Octaga Security Services LTD	Partial evidence	Hereford, United KingdomHQ checked Sep 21, 2026	51-200	80 contacts →
	Partial evidence “Octaga Security Services provide a comprehensive security service for our clients' individual concerns and requirements.'Fit for purpose’ and ‘value for money’ are our bywords for…” Source: RevenueBase Database · checked Sep 21, 2026
18	Bold Security Group	Partial evidence	Grays, United KingdomHQ checked Sep 21, 2026	201-500	74 contacts →
	Partial evidence “Bold Security Group is a trusted provider of facilities management and security services, delivering dependable and tailored solutions that protect people, property and reputation.” Source: RevenueBase Database · checked Sep 21, 2026
19	Northern Security LTD	Partial evidence	Carlisle, United KingdomHQ checked Sep 21, 2026	201-500	69 contacts →
	Partial evidence “Northern Security Ltd is a leading guarding, alarm response and electronic security business operating throughout the North of England and South West Scotland.” Source: RevenueBase Database · checked Sep 21, 2026
20	GMS Group Of Companies	Partial evidence	Oldbury, United KingdomHQ checked Sep 21, 2026	201-500	66 contacts →
	Partial evidence “GMS Group offers a joined-up suite of security services for businesses and individuals.” Source: RevenueBase Database · checked Sep 21, 2026
21	Britsafe Limited	Partial evidence	Amy Johnson Way, United KingdomHQ checked Sep 21, 2026	501-1,000	66 contacts →
	Partial evidence “Welcome to Britsafe Limited Years of Security and Cleaning experience have made us masters in providing defect-free security and cleaning solutions tailor-made to suit the…” Source: RevenueBase Database · checked Sep 21, 2026
22	United Guarding Services LTD	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	64 contacts →
	Partial evidence “United Guarding Services has been a trusted name in the security industry for over 30 years, providing high-performance security solutions for prestigious premises in London and…” Source: RevenueBase Database · checked Sep 21, 2026
23	City Security Services Part Of City Group Security	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	64 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 21, 2026
24	Sentinel Group Security	Partial evidence	Loughton, United KingdomHQ checked Sep 21, 2026	201-500	60 contacts →
	Partial evidence “Sentinel Group Security is a fast growing provider of all aspects of security personnel and manned security services operating across the United Kingdom.” Source: RevenueBase Database · checked Sep 21, 2026
25	Black Diamond Security	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	58 contacts →
	Partial evidence “Black Diamond Security - Safeguarding Your World.” 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: sf security companies. 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 sf security companies.
Partial evidence: Its own public description names part of sf security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sf security companies. 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 1,408 sf security companies based in the United Kingdom

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Sf security companies based in the United Kingdom at a glance

As of Sep 21, 2026

11.3%Verified-email coverage

13.1Average contacts per company

11-50Median size (employees)

21.2%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

520

11-50

447

51-200

299

201-500

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 1,408 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 sf security companies, 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 “sf security companies”. 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 sf security companies), 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 sf 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 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, 2,089 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.

Sf security companies by metro

Sf security companies in London299
Sf security companies in Birmingham37
Sf security companies in Manchester33

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 sf security companies, 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 sf security companies are there based in the United Kingdom?

RevenueBase identified 1,408 sf 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?

CIS Security Limited, headquartered in London, tops this list with the largest team on record.

Which city has the most sf security companies?

London leads with 299 headquartered companies, followed by Birmingham (37) and Manchester (33).

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 2,089 verified decision-maker contacts tracked across these 1,408 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.