Company lists · Data refreshed November 2026

Top 25 Investigation firms worldwide

Name: Investigation firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 10,342 companies tracked

RevenueBase identified 10,342 company matches for investigation firms worldwide as of November 2026 and tracks 95,808 professional contacts across them, including 18,953 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for investigation firms worldwide, 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. Country and city lists for investigation firms follow the table.

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

10,342Companies

95,808Contacts tracked

18,953Verified emails

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The 25 largest investigation firms worldwide

Ranked by team size

Top 25 of 10,342 company matches for investigation firms worldwide, 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.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	U.S. Security Associates, INC	Exact match	Roswell, UT, United StatesHQ recorded Nov 6, 2026	10001+	4,263 contacts →
	Exact match “U.S.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Cellebrite	Exact match	Vienna, VA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,314 contacts →
	Exact match “Cellebrite is the leader in digital intelligence and investigative analytics, partnering with public and private organizations to transform how they manage data in investigations…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Banque Populaire Bourgogne Franche-Com	Exact match	Dijon, FranceHQ recorded Nov 6, 2026	1,001-5,000	1,301 contacts →
	Exact match “BANQUE POPULAIRE BOURGOGNE FRANCHE-COM is a Security and Investigations company located in 14 BOULEVARD DE LA TREMOUILLE, DIJON, Burgundy, France.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	HKA	Exact match	London, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	1,223 contacts →
	Exact match “HKA is the leading global consultancy in risk mitigation, forensic investigations, dispute resolution, expert witness and litigation support services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	EFI Global	Exact match	Memphis, TN, United StatesHQ recorded Nov 6, 2026	501-1,000	813 contacts →
	Exact match “EFI Global is a multidisciplinary consulting firm that helps clients investigate, assess and resolve complex property, infrastructure and financial challenges.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Professional Security Consultants, INC	Exact match	Los Angeles, CA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	697 contacts →
	Exact match “Professional Security Consultants, Inc.(PSC) is a world-class provider of security guard services, patrol, investigations, backgrounds, consulting, security screening & specialty…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Omniplex World Services Corporation	Exact match	Herndon, VA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	696 contacts →
	Exact match “OMNIPLEX World Services Corporation is a leader and innovator in delivering professional background investigations, intelligence support, and physical security services to…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	DK Security	Exact match	Grand Rapids, MI, United StatesHQ recorded Nov 6, 2026	1,001-5,000	592 contacts →
	Exact match “DK Security is unique in that it offers a single company for a wide ranging availability of security and investigative services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	Ranger American	Exact match	San Juan, United StatesHQ recorded Nov 6, 2026	1,001-5,000	540 contacts →
	Exact match “Founded in 1982, Ranger American is a professional security organization with an extensive background in the security and investigation fields.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Engineering Systems Inc. ESI	Exact match	Aurora, MI, United StatesHQ recorded Nov 6, 2026	201-500	495 contacts →
	Exact match “Engineering Systems Inc.(ESi) is a forensic engineering and scientific investigation firm committed to providing actionable solutions to industry and technical challenges through…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Eurofins Forensic Services	Exact match	Feltham, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	428 contacts →
	Exact match “Eurofins Forensic Services (formerly LGC Forensics) is the market leader in the provision of forensic services to the England and Wales Criminal Justice System and to criminal…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	American Security & Investigations	Exact match	St. Paul, IA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	420 contacts →
	Exact match “American Security & Investigations has provided security and investigative services throughout the upper midwest since 1959.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	ETHOS	Exact match	St. Petersburg, FL, United StatesHQ recorded Nov 6, 2026	1,001-5,000	417 contacts →
	Exact match “Ethos Risk Services is a technology-backed, full-service claims management company.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	MDD Forensic Accountants	Exact match	Boston, BC, United StatesHQ recorded Nov 6, 2026	201-500	395 contacts →
	Exact match “Founded in 1933, MDD is a leading international forensic accounting firm that provides economic damage quantification assessments for its clients.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Norred & Associates, INC	Exact match	Atlanta, GA, United StatesHQ recorded Nov 6, 2026	501-1,000	378 contacts →
	Exact match “A full-service firm with the proven capabilities to manage all facets of your company’s security requirements, Norred & Associates, Inc.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Coventbridge Group	Exact match	Jacksonville, FL, United StatesHQ recorded Nov 6, 2026	501-1,000	377 contacts →
	Exact match “CoventBridge Group is the leading worldwide full service investigation solutions company providing: Surveillance, SIU and Compliance, Claims Investigation, Counter-Fraud Programs…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Envista Forensics	Exact match	Chicago, NC, United StatesHQ recorded Nov 6, 2026	201-500	372 contacts →
	Exact match “Envista Forensics is the global leader in providing comprehensive forensic consulting and engineering services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Phangela Group	Exact match	Cape Town, South AfricaHQ recorded Nov 6, 2026	5,001-10,000	369 contacts →
	Exact match “Phangela Group is a premier security and investigations company headquartered in South Africa.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	Vcheck	Exact match	New York, NY, United StatesHQ recorded Nov 6, 2026	201-500	367 contacts →
	Exact match “Vcheck is a global investigations firm that helps institutions protect their investments by providing intelligence on individuals and entities.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Digistream Investigations	Exact match	Davis, CA, United StatesHQ recorded Nov 6, 2026	201-500	359 contacts →
	Exact match “DigiStream Investigations is a full-service private investigation firm specializing in insurance defense and legal support services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Colvill Banks LTD	Exact match	Fareham, United KingdomHQ recorded Nov 6, 2026	201-500	313 contacts →
	Exact match “Colvill Banks are experts in candidate research and identification.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	S-E-A	Exact match	Columbus, OH, United StatesHQ recorded Nov 6, 2026	201-500	310 contacts →
	Exact match “Established in 1970, S-E-A is a recognized worldwide leader in forensic analysis and investigation.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	Guidepost Solutions	Exact match	New York, IL, United StatesHQ recorded Nov 6, 2026	201-500	292 contacts →
	Exact match “We stand at the forefront of leadership, insight, and guidance in a world marked by complexity and uncertainty.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Icover Services	Exact match	Paris, FranceHQ recorded Nov 6, 2026	201-500	284 contacts →
	Exact match “iCOVER Group provides high-quality Third-Party Background Screening, Monitoring, and Due Diligence services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	Resolution Economics	Exact match	Los Angeles, CA, United StatesHQ recorded Nov 6, 2026	201-500	262 contacts →
	Exact match “Founded in 1998, Resolution Economics provides sophisticated economic, statistical, and financial analyses, forensic investigations, forensic technology, dispute advisory, expert…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “investigation firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 10,342 investigation firms worldwide

See the full list, filter by size, metro and specialty, and access 18,953 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Investigation firms worldwide at a glance

As of Nov 6, 2026

19.8%Verified-email coverage

9.3Average contacts per company

1-10Median size (employees)

2.3%Largest-city concentration · London

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

6,435

11-50

2,593

51-200

826

201-500

218

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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.
Coverage: Every country. Country and city lists for investigation firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “investigation firms” 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. 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 18,953 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.

Investigation firms by location

51 lists · largest first

Every Investigation firms 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 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 “investigation firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many investigation firms are there worldwide?

RevenueBase identified 10,342 company matches for investigation firms worldwide 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?

U.S. Security Associates, INC tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most investigation firms?

The United States leads with 4,226 companies, followed by the United Kingdom (725) and India (430). Every investigation firms list by country and city is linked on this page.

Which city has the most investigation firms?

London leads with 237 company records, followed by New York (154) and Sao Paulo (102).

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 18,953 professional contacts with verified work emails tracked across these 10,342 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.