Company lists · Data refreshed September 2026

Top 25 Intelligence and security consultants based in London, United Kingdom

Name: Intelligence and security consultants based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 12, 2026 476 companies tracked

RevenueBase identified 476 intelligence and security consultants headquartered in London, United Kingdom as of September 2026 and tracks 88,150 professional contacts across them, including 3,407 with verified work emails and 8,199 with mobile numbers. Across the United Kingdom, London is the largest hub for this category.

This list covers intelligence and security consultants headquartered in London, 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 12, 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 12, 2026 86% judged on-target in blind review

476Companies

88,150Contacts tracked

3,407Verified emails

8,199Mobile numbers

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The 25 largest intelligence and security consultants based in London, United Kingdom

Ranked by team size

Top 25 of 476 intelligence and security consultants based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 12, 2026. RevenueBase Smart Search rates how each company's information relates to intelligence and security consultants: 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 12, 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 12, 2026
2	Control Risks	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1,001-5,000	2,972 contacts →
	Partial evidence “Control Risks is a global specialist risk consultancy that helps to create secure, compliant and resilient organisations.” Source: RevenueBase Database · checked Sep 12, 2026
3	Ward Security	Partial evidence	London, United KingdomHQ checked Sep 12, 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 12, 2026
4	S-Rm	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	351 contacts →
	Strong evidence “S-RM is a global intelligence and cyber security consultancy.” Source: RevenueBase Database · checked Sep 12, 2026
5	G3	Indirect evidence	London, United KingdomHQ checked Sep 12, 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 12, 2026
6	Trpglobal	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	126 contacts →
	Indirect evidence “We are TRPGLOBAL, your strategic partner in helping you with the complexities of risk management.” Source: RevenueBase Database · checked Sep 12, 2026
7	FACT	Partial evidence	London, United KingdomHQ checked Sep 12, 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 12, 2026
8	AKE International	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	89 contacts →
	Indirect evidence “We are proud of our unique track record.” Source: RevenueBase Database · checked Sep 12, 2026
9	White HAT An Epam Company	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	77 contacts →
	Strong 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 12, 2026
10	Wallbrook, Part Of Anthesis	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	64 contacts →
	Partial evidence “We provide intelligence, advisory and investigative services to investors, companies and NGOs grappling with the world's most important issues.” Source: RevenueBase Database · checked Sep 12, 2026
11	Cyro Cyber	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	62 contacts →
	Partial evidence “Cyro Cyber are your cyber security Guardians.” Source: RevenueBase Database · checked Sep 12, 2026
12	Daintta	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	60 contacts →
	Indirect evidence “We provide deep expertise with technical and business specialists to help clients secure and protect the UK.” Source: RevenueBase Database · checked Sep 12, 2026
13	Assist Security Group	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	58 contacts →
	Partial evidence “Assist Security Group (ASG) helps clients build resilient, comprehensive security strategies that protect their people and assets, business continuity and reputation.” Source: RevenueBase Database · checked Sep 12, 2026
14	Custom Intelligent Security	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	51 contacts →
	Strong evidence “Established in Custom Intelligent Security is a technology driven ISO27001 & NSi Gold Accredited independent electronic security specialist with a proven track record of…” Source: RevenueBase Database · checked Sep 12, 2026
15	Dragonfly From DOW Jones	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	n/a	50 contacts →
	Strong evidence “Dragonfly is a geopolitical and security intelligence service for the world’s leading organisations.” Source: RevenueBase Database · checked Sep 12, 2026
16	GSA Global	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	49 contacts →
	Partial evidence “GSA Global helps organisations, families and individuals respond to serious, complex and emerging security risks.” Source: RevenueBase Database · checked Sep 12, 2026
17	Frankton Group LTD	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	48 contacts →
	Indirect evidence “In today’s complex threat environment, businesses, individuals, and organisations require trusted partners to provide the ultimate assurance that their assets are well protected.” Source: RevenueBase Database · checked Sep 12, 2026
18	Cornerstone	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	44 contacts →
	Partial evidence “CornerStone is an award winning, independent, security and digital building consulting firm with headquarters in the UK.” Source: RevenueBase Database · checked Sep 12, 2026
19	Gratte Brothers Security Systems & Software	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	39 contacts →
	Partial evidence “Gratte Brothers is an experienced provider of integrated security solutions, which are Built on Strong Values and ultimately deliver a measurable return on investment.” Source: RevenueBase Database · checked Sep 12, 2026
20	Secforce LTD	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	39 contacts →
	Strong evidence “SECFORCE are vendor independent offensive security specialists providing effective business risk intelligence and strategic security consulting.” Source: RevenueBase Database · checked Sep 12, 2026
21	Audere Group	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	37 contacts →
	Indirect evidence “Audere Group is a London-headquartered holistic risk advisory company founded in 2014.” Source: RevenueBase Database · checked Sep 12, 2026
22	HAROD	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	36 contacts →
	Partial evidence “Harod Associates delivers global investigation and security solutions to complex crime and risk issues.” Source: RevenueBase Database · checked Sep 12, 2026
23	Venovox	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	35 contacts →
	Strong evidence “At VENOVOX, we are a premier consultancy in risk management and background screening, delivering specialised services in due diligence, security advisory, background checks, and…” Source: RevenueBase Database · checked Sep 12, 2026
24	Gpw, A Part Of J.S. Held	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	35 contacts →
	Indirect evidence “In May of 2022, GPW was acquired by J.S.” Source: RevenueBase Database · checked Sep 12, 2026
25	Skylark Security LTD	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	n/a	34 contacts →
	Partial evidence “Skylark is a bespoke security service provider based in London.” Source: RevenueBase Database · checked Sep 12, 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: intelligence and security consultants. 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 intelligence and security consultants.
Partial evidence: Its own public description names part of intelligence and security consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name intelligence and security consultants. 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 476 intelligence and security consultants based in London, United Kingdom

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Intelligence and security consultants based in London, United Kingdom at a glance

As of Sep 12, 2026

3.9%Verified-email coverage

9.3%Mobile-number coverage

185.2Average contacts per company

1-10Median size (employees)

Sep 12, 2026Page data refreshed

Companies by employee count

1-10

260

11-50

137

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 15.0d

2,8710–30

49731–60

1861–90

290–180

19180+

Company record updated

Median 80.0d

00–30

14,10931–60

59,03661–90

13,13290–180

1,873180+

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 intelligence and security consultants, 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 London, United Kingdom whose own description of what they do matches “intelligence and security consultants”. 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 intelligence and security consultants), 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 intelligence and security consultants, and records with no verified work email. Companies headquartered outside London 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, 3,407 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 12, 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

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 intelligence and security consultants, 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 intelligence and security consultants are there based in London, United Kingdom?

RevenueBase identified 476 intelligence and security consultants headquartered in London, 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 in the United Kingdom has the most intelligence and security consultants?

London leads the United Kingdom with 452 headquartered companies, followed by Manchester (26) 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 3,407 verified decision-maker contacts tracked across these 476 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 12, 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.