Company lists · Data refreshed September 2026

Top 25 Private intelligence agencies worldwide

Name: Private intelligence agencies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 8,873 companies tracked

RevenueBase identified 8,873 private intelligence agencies worldwide as of September 2026 and tracks 289,513 professional contacts across them, including 33,651 with verified work emails. The United States is the largest market and London the largest hub.

This list covers private intelligence agencies worldwide, 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. Country and city lists for private intelligence agencies follow the table.

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

8,873Companies

289,513Contacts tracked

33,651Verified emails

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The 25 largest private intelligence agencies worldwide

Ranked by team size

Top 25 of 8,873 private intelligence agencies worldwide, 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	Securitas Security Services Usa, INC	Indirect evidence	Parsippany, NJ, United StatesHQ checked Sep 21, 2026	10001+	38,634 contacts →
	Indirect evidence “Securitas knows Security.” Source: RevenueBase Database · checked Sep 21, 2026
3	U.S. Security Associates, INC	Indirect evidence	Roswell, GA, United StatesHQ checked Sep 21, 2026	10001+	3,592 contacts →
	Indirect evidence “U.S.” Source: RevenueBase Database · checked Sep 21, 2026
4	Securitas Sverige AB	Indirect evidence	Stockholm, SwedenHQ checked Sep 21, 2026	5,001-10,000	3,004 contacts →
	Indirect evidence “Securitas is a global knowledge leader in security.” Source: RevenueBase Database · checked Sep 21, 2026
5	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
6	Security Industry Specialists	Indirect evidence	Culver City, CA, United StatesHQ checked Sep 21, 2026	5,001-10,000	2,500 contacts →
	Indirect evidence “The industry leader in security, Security Industry Specialists offers unique solutions to Fortune 500 companies, international events, and celebrity clients.” Source: RevenueBase Database · checked Sep 21, 2026
7	OPTIV	Indirect evidence	Leawood, KS, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,222 contacts →
	Indirect evidence “Optiv is the cyber advisory and solutions leader, delivering strategic and technical expertise to nearly companies across every major industry.” Source: RevenueBase Database · checked Sep 21, 2026
8	Crisis24	Indirect evidence	Annapolis, MD, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,025 contacts →
	Indirect evidence “Crisis24, a GardaWorld company, is widely regarded as the leading integrated risk management, crisis response, consulting, and global protective solutions firm, serving the…” Source: RevenueBase Database · checked Sep 21, 2026
9	Pinkerton Comprehensive Risk Management	Indirect evidence	Ann Arbor, MI, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,022 contacts →
	Indirect evidence “Pinkerton, established in 1850 by Allan Pinkerton, stands as a leading global provider of security and risk management solutions.” Source: RevenueBase Database · checked Sep 21, 2026
10	Paragon Systems INC	Indirect evidence	Herndon, VA, United StatesHQ checked Sep 21, 2026	10001+	1,949 contacts →
	Indirect evidence “Paragon Systems employs over 10,500 professionals in specialized operations providing security, fire, investigations, inspections, cybersecurity, risk management, and mission…” Source: RevenueBase Database · checked Sep 21, 2026
11	Trigion	Indirect evidence	Schiedam, NetherlandsHQ checked Sep 21, 2026	5,001-10,000	1,922 contacts →
	Indirect evidence “Elke dag zetten onze collega’s zich in voor jouw veiligheid en die van iedereen om jou heen, zodat jij je veilig voelt en veilig bent.” Source: RevenueBase Database · checked Sep 21, 2026
12	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
13	Airbus Protect	Indirect evidence	Blagnac, FranceHQ checked Sep 21, 2026	1,001-5,000	1,431 contacts →
	Indirect evidence “Airbus Protect is an Airbus subsidiary bringing together expertise in cybersecurity, safety and sustainability-related services.” Source: RevenueBase Database · checked Sep 21, 2026
14	Securitas Belgium	Indirect evidence	Diegem, BelgiumHQ checked Sep 21, 2026	5,001-10,000	1,419 contacts →
	Indirect evidence “See a different world.” Source: RevenueBase Database · checked Sep 21, 2026
15	Site سايت	Indirect evidence	Al Nakheel, Saudi ArabiaHQ checked Sep 21, 2026	501-1,000	1,378 contacts →
	Indirect evidence “We are established for enriching local content in designing, developing, and operating secure digital computing environments through Saudi talents, by fulfilling our role as a…” Source: RevenueBase Database · checked Sep 21, 2026
16	Guardsmark	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	10001+	1,375 contacts →
	Indirect evidence “Guardsmark, LLC provides security services.” Source: RevenueBase Database · checked Sep 21, 2026
17	First Security Group LLC	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 21, 2026	5,001-10,000	1,374 contacts →
	Indirect evidence “First Security Group LLC was founded in 2004 with the vision of His Highness, the Vice President, Prime Minister, and Ruler of Dubai, Sheikh Mohamed bin Rashid Al Maktoum.” Source: RevenueBase Database · checked Sep 21, 2026
18	Securitas Colombia	Indirect evidence	Bogota, ColombiaHQ checked Sep 21, 2026	5,001-10,000	1,368 contacts →
	Indirect evidence “Securitas es reconocida como una multinacional líder mundial en seguridad.” Source: RevenueBase Database · checked Sep 21, 2026
19	Protectas	Indirect evidence	Lausanne, SwitzerlandHQ checked Sep 21, 2026	1,001-5,000	1,318 contacts →
	Indirect evidence “Protectas belongs to the Swedish Securitas AB, the knowledged leader in security (which incidentally is not affiliated with the Swiss company of the same name, Securitas AG).” Source: RevenueBase Database · checked Sep 21, 2026
20	Banque Populaire Bourgogne Franche-Com	Indirect evidence	Dijon, FranceHQ checked Sep 21, 2026	1,001-5,000	1,233 contacts →
	Indirect evidence “BANQUE POPULAIRE BOURGOGNE FRANCHE-COM is a Security and Investigations company located in 14 BOULEVARD DE LA TREMOUILLE, DIJON, Burgundy, France.” Source: RevenueBase Database · checked Sep 21, 2026
21	Guidepoint Security	Indirect evidence	Reston, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,232 contacts →
	Indirect evidence “GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Source: RevenueBase Database · checked Sep 21, 2026
22	SOS Security LLC	Indirect evidence	Parsippany, NJ, United StatesHQ checked Sep 21, 2026	10001+	1,151 contacts →
	Indirect evidence “SOS Security is a known innovator and leader in the security and protective services industry.” Source: RevenueBase Database · checked Sep 21, 2026
23	Andrews International	Indirect evidence	Burbank, CA, United StatesHQ checked Sep 21, 2026	10001+	1,081 contacts →
	Indirect evidence “Twenty-five years ago Andrews International (AI) began forming a network of the world’s foremost security authorities and connecting with strategic partners for operations…” Source: RevenueBase Database · checked Sep 21, 2026
24	Brosnan Risk Consultants	Indirect evidence	Pearl River, NY, United StatesHQ checked Sep 21, 2026	5,001-10,000	1,050 contacts →
	Indirect evidence “Brosnan Risk Consultants, Ltd.(BRC) is a security risk management firm focusing on physical security, emergency security, disaster preparedness and recovery and management…” Source: RevenueBase Database · checked Sep 21, 2026
25	Seguritech	Partial evidence	Ciudad De Mexico, MexicoHQ checked Sep 21, 2026	1,001-5,000	1,041 contacts →
	Partial evidence “A lo largo de 30 años, hemos incursionado y evolucionado en distintas áreas atendiendo en el continente americano a clientes privados, corporativos y sector gobierno.” 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 8,873 private intelligence agencies worldwide

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Private intelligence agencies worldwide at a glance

As of Sep 21, 2026

11.6%Verified-email coverage

32.6Average contacts per company

11-50Median size (employees)

4.1%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

4,147

11-50

2,704

51-200

1,169

201-500

406

501-1,000

172

1,001-5,000

189

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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.
Coverage: Every country. Country and city lists for private intelligence agencies are linked below.
What qualifies: Companies worldwide 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.
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, 33,651 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 location

36 lists · largest first

Every Private intelligence agencies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 worldwide?

RevenueBase identified 8,873 private intelligence agencies worldwide 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 country has the most private intelligence agencies?

The United States leads with 2,608 companies, followed by the United Kingdom (864) and India (324). Every private intelligence agencies list by country and city is linked on this page.

Which city has the most private intelligence agencies?

London leads with 367 headquartered companies, followed by New York (115) and Paris (99).

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 33,651 verified decision-maker contacts tracked across these 8,873 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.