Company lists · Data refreshed September 2026

Top 25 Private intelligence agencies based in the United Kingdom

Name: Private intelligence agencies 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 864 companies tracked

RevenueBase identified 864 private intelligence agencies headquartered in the United Kingdom as of September 2026 and tracks 94,554 professional contacts across them, including 4,439 with verified work emails. London is the largest hub.

This list covers private intelligence agencies 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

864Companies

94,554Contacts tracked

4,439Verified emails

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The 25 largest private intelligence agencies based in the United Kingdom

Ranked by team size

Top 25 of 864 private intelligence agencies 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 intelligence agencies: 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	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	10001+	79,699 contacts →
	Indirect 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	Control Risks	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	1,001-5,000	2,972 contacts →
	Indirect evidence “Control Risks is a global specialist risk consultancy that helps to create secure, compliant and resilient organisations.” Source: RevenueBase Database · checked Sep 21, 2026
3	Mitie Security	Partial evidence	Northampton, United KingdomHQ checked Sep 21, 2026	10001+	1,508 contacts →
	Partial evidence “We are an intelligence-led security business.” Source: RevenueBase Database · checked Sep 21, 2026
4	Icts UK & Ireland	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	1,001-5,000	597 contacts →
	Indirect 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
5	Securityhq	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	502 contacts →
	Indirect evidence “SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.” Source: RevenueBase Database · checked Sep 21, 2026
6	Ward Security	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	1,001-5,000	419 contacts →
	Partial 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
7	S-Rm	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	351 contacts →
	Partial evidence “S-RM is a global intelligence and cyber security consultancy.” Source: RevenueBase Database · checked Sep 21, 2026
8	Sibylline	Strong evidence	Global, United KingdomHQ checked Sep 21, 2026	201-500	289 contacts →
	Strong evidence “Sibylline is the world’s leading private consultancy for geopolitical risk, intelligence, and strategic insight, dedicated to helping leaders and organisations anticipate change…” Source: RevenueBase Database · checked Sep 21, 2026
9	Pilgrims Risk Management Group	Indirect evidence	Woking, United KingdomHQ checked Sep 21, 2026	201-500	205 contacts →
	Indirect 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	Indirect evidence	Leeds, United KingdomHQ checked Sep 21, 2026	1,001-5,000	180 contacts →
	Indirect 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	Deepcytes Cyber Labs UK	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	177 contacts →
	Indirect evidence “Whether you’re a business or an individual, digital threats to your precious data and assets can come in any form - external or internal.” Source: RevenueBase Database · checked Sep 21, 2026
12	Schillings	Indirect evidence	12 Arthur Street, United KingdomHQ checked Sep 21, 2026	51-200	161 contacts →
	Indirect evidence “Schillings deploys a unique combination of expertise to help you handle high stakes opportunities and threats, because we believe everyone has a right to fair treatment of their…” Source: RevenueBase Database · checked Sep 21, 2026
13	G3	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	159 contacts →
	Indirect evidence “We are a global advisory company that helps our clients enable their opportunities and manage key risks.” Source: RevenueBase Database · checked Sep 21, 2026
14	Corporate Research And Investigations	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	140 contacts →
	Indirect evidence “Corporate Research and Investigations Limited is a global provider of investigative research, background screening and business due diligence services for the world’s leading…” Source: RevenueBase Database · checked Sep 21, 2026
15	CCL Solutions Group	Indirect evidence	Stratford Upon Avon, United KingdomHQ checked Sep 21, 2026	51-200	138 contacts →
	Indirect evidence “CCL Solutions Group is one of Europe’s leading digital forensics, digital investigation and cyber security specialists, supporting law enforcement, government agencies, military…” Source: RevenueBase Database · checked Sep 21, 2026
16	FACT	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	117 contacts →
	Partial evidence “FACT are at the forefront of investigative and intelligence services, recognised by organisations, law enforcement, and governments worldwide.” Source: RevenueBase Database · checked Sep 21, 2026
17	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
18	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
19	The Risk Advisory Group	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	94 contacts →
	Partial evidence “Risk Advisory Group is a global business intelligence and investigations firm.” Source: RevenueBase Database · checked Sep 21, 2026
20	Amethyst Risk Management	Indirect evidence	Basingstoke, United KingdomHQ checked Sep 21, 2026	11-50	85 contacts →
	Indirect evidence “Amethyst Risk Management is a leading cybersecurity consultancy supplying expert services and support to the UK Government, Defence, Operators of Essential Services, and the…” Source: RevenueBase Database · checked Sep 21, 2026
21	Foregenix	Indirect evidence	Swindon, United KingdomHQ checked Sep 21, 2026	51-200	80 contacts →
	Indirect evidence “When your business relies on security, compliance and a strong reputation for taking care of your customers, you need a partner that understands your ethos, your challenges and…” Source: RevenueBase Database · checked Sep 21, 2026
22	Reliance Cyber	Indirect evidence	Waterloo, United KingdomHQ checked Sep 21, 2026	51-200	80 contacts →
	Indirect evidence “At Reliance Cyber, we believe in truly partnering with our customers.” Source: RevenueBase Database · checked Sep 21, 2026
23	Minimal Risk Consultancy Limited	Indirect evidence	Hereford., United KingdomHQ checked Sep 21, 2026	51-200	79 contacts →
	Indirect evidence “Minimal Risk Consultancy is an Independent Security Services, Specialist Consultancy and Recruitment business with current expertise in:> Security Risk Consultancy > Security…” Source: RevenueBase Database · checked Sep 21, 2026
24	Peregrine Risk Management	Partial evidence	Plymouth, United KingdomHQ checked Sep 21, 2026	201-500	79 contacts →
	Partial evidence “Peregrine Risk Management is a leading provider of physical security, risk consultancy, travel risk management, security intelligence, and specialist training services.” Source: RevenueBase Database · checked Sep 21, 2026
25	White HAT An Epam Company	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	77 contacts →
	Partial evidence “White Hat, part of the EPAM group, is an award-winning cyber intelligence and offensive security company that leverages an attacker’s perspective to shape innovative, proactive…” 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 intelligence agencies. 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 intelligence agencies.
Partial evidence: Its own public description names part of private intelligence agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name private intelligence agencies. 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 864 private intelligence agencies based in the United Kingdom

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Private intelligence agencies based in the United Kingdom at a glance

As of Sep 21, 2026

4.7%Verified-email coverage

109.4Average contacts per company

1-10Median size (employees)

42.4%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

456

11-50

249

51-200

107

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 864 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 intelligence agencies, 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 intelligence agencies”. 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 intelligence agencies), 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 intelligence agencies, 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, 4,439 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 intelligence agencies by metro

Private intelligence agencies in London366

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 intelligence agencies, 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 intelligence agencies are there based in the United Kingdom?

RevenueBase identified 864 private intelligence agencies 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 intelligence agencies?

London leads with 366 headquartered companies, followed by Birmingham (9) and Bristol (9).

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 4,439 verified decision-maker contacts tracked across these 864 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.