Company lists · Data refreshed November 2026

Top 17 Counterintelligence services based in the United Kingdom

RevenueBase identified 68 company matches for counterintelligence services associated with the United Kingdom as of November 2026 and tracks 571 professional contacts across them, including 142 with verified work emails. London is the largest hub.

This list covers company matches for counterintelligence services associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 6, 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 RevenueBase SmartSearch · Exact Recorded Nov 6, 2026 How this list was built
68Companies
571Contacts tracked
142Verified emails
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The 17 largest counterintelligence services based in the United Kingdom

Ranked by team size
Top 17 of 68 company matches for counterintelligence services based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchLondon, United KingdomHQ recorded Nov 6, 202651-200126 contacts →

Exact match

“FACT are at the forefront of investigative and intelligence services, recognised by organisations, law enforcement, and governments worldwide.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2Exact matchLondon, United KingdomHQ recorded Nov 6, 2026n/a50 contacts →

Exact match

“Dragonfly is a geopolitical and security intelligence service for the world’s leading organisations.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3Exact matchNewark, United KingdomHQ recorded Nov 6, 202611-5044 contacts →

Exact match

“Investigation Limited is a well-established company offering Corporate Intelligence Services globally.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4Exact matchLondon, United KingdomHQ recorded Nov 6, 202611-5039 contacts →

Exact match

“Harod Associates delivers global investigation and security solutions to complex crime and risk issues.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5Exact matchOxford, United KingdomHQ recorded Nov 6, 202611-5025 contacts →

Exact match

“Horus is a leading intelligence and security consultancy with a global, multilingual team of unrivalled experience, insight and operational expertise.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6Exact matchLondon, United KingdomHQ recorded Nov 6, 202611-5024 contacts →

Exact match

“Our Chartered Security Professionals seamlessly integrate discreet and effective security into lifestyles and organisations.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7Exact matchLondon, United KingdomHQ recorded Nov 6, 202611-5010 contacts →

Exact match

“QCC Global Ltd is a leading global supplier of counter espionage and technical surveillance counter measures (TSCM) services to government, police and commercial organisations.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8Exact matchFrimley, United KingdomHQ recorded Nov 6, 20261-109 contacts →

Exact match

“Esoteric is a leading provider of counter-espionage and specialist covert surveillance services.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9Exact matchLondon, United KingdomHQ recorded Nov 6, 20261-109 contacts →

Exact match

“Silverbridge is an independent investigations and intelligence firm offering a full range of information gathering services.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10Exact matchLondon, United KingdomHQ recorded Nov 6, 20261-108 contacts →

Exact match

“InsightX is a specialist independent intelligence, investigations and due diligence agency.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11Exact matchGloucester, United KingdomHQ recorded Nov 6, 202611-506 contacts →

Exact match

“Since incorporation in 2002, International Intelligence Limited has provided services world-wide in support of our Clients.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12Exact matchLondon, United KingdomHQ recorded Nov 6, 20261-105 contacts →

Exact match

“Whiterock: a service delivery company that protects confidential business information against the threat of corporate espionage and unauthorised surveillance.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13Exact matchDartford, United KingdomHQ recorded Nov 6, 20261-103 contacts →

Exact match

“6S Global have over 25 years’ accredited experience in the Security, Business and Data Intelligence Industry.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14Exact matchTeddingham, United KingdomHQ recorded Nov 6, 20261-102 contacts →

Exact match

“Red Fox International (RFX) supports small and large multinational companies by implementing effective policies and services to protect their businesses from corporate espionage.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15Exact matchCorsham, United KingdomHQ recorded Nov 6, 202611-502 contacts →

Exact match

“International intelligence specialists: With companies registered in the UK and Denmark, IMSL understands the huge potential that harnessing the power of quality, timely, and…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16Exact matchLondon, United KingdomHQ recorded Nov 6, 20261-101 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17Exact matchLondon, United KingdomHQ recorded Nov 6, 20261-101 contacts →

Exact match

“We find and leverage the information and intelligence key to protecting your business and building future success.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

Showing 17 of 68 counterintelligence services based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 142 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Counterintelligence services based in the United Kingdom at a glance

As of Nov 6, 2026
24.9%Verified-email coverage
8.4Average contacts per company
1-10Median size (employees)
60.3%Largest-city concentration · London
Nov 6, 2026Page data refreshed

Companies by employee count

1-10
39
11-50
20
51-200
5
201-500
1
5,001-10,000
1
10001+
1

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 68 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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
Company records associated with the United Kingdom whose business descriptions match “counterintelligence services” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 142 professional contacts with verified work emails across the full matched dataset. 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 November 6, 2026. Lists refresh periodically as the graph is re-checked.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

Counterintelligence services by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “counterintelligence services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many counterintelligence services are there based in the United Kingdom?

RevenueBase identified 68 company matches for counterintelligence services associated with the United Kingdom as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

FACT tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most counterintelligence services?

London leads with 41 company records, followed by Aberdeen (1) and Bodmin (1).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 142 professional contacts with verified work emails tracked across these 68 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 6, 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.