Company lists · Data refreshed November 2026
Top 25 Investigative services worldwide
RevenueBase identified 8,059 company matches for investigative services worldwide as of November 2026 and tracks 75,510 professional contacts across them, including 11,620 with verified work emails. The United States is the largest market and London the largest hub.
This list covers company matches for investigative services 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 investigative services 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.
The 25 largest investigative services worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,928 contacts → | ||||
Exact match “Paragon Systems employs over 10,500 professionals in specialized operations providing security, fire, investigations, inspections, cybersecurity, risk management, and mission…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 2 | 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 | |||||
| 3 | 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 | |||||
| 4 | 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 | |||||
| 5 | 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 | |||||
| 6 | 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 | |||||
| 7 | 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 | |||||
| 8 | 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 | |||||
| 9 | 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 | |||||
| 10 | 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 | |||||
| 11 | 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 | |||||
| 12 | 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 | |||||
| 13 | 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 | |||||
| 14 | 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 | |||||
| 15 | 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 | |||||
| 16 | 292 contacts → | ||||
Exact match “GSG Protective Services is a full-service provider of quality security services specializing in 6 divisions: investigations, physical security, protective services, technology…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 17 | 262 contacts → | ||||
Exact match “Formally known as Delta Associated Investigations, Delta Group is a National Fraud Management organization that has been serving the Property Casualty & Disability marketplace for…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 18 | 252 contacts → | ||||
Exact match “ADC supports government and corporate clients with two primary services - personnel security, ranging from pre-employment checks to comprehensive background investigations and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 19 | 246 contacts → | ||||
Exact match “IIRIS operating under its distinct business offerings "IntelliRisk"(IR),"IntelliSense"(IS),"Security Design" and "Brand Protection" seeks to provide comprehensive intelligence…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 20 | 243 contacts → | ||||
Exact match “A national portfolio of premier forensic services companies, Aperture uses proven science and accepted industry standards to deliver accurate and efficient expert analysis.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 21 | 237 contacts → | ||||
Exact match “HUB Enterprises is a national insurance defense investigative firm.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 22 | 235 contacts → | ||||
Exact match “Xpera has been a trusted partner to businesses and governments for over 50 years.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 23 | 232 contacts → | ||||
Exact match “Full Service Security and Investigative company serving the government sector.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 24 | 225 contacts → | ||||
Exact match “Advantage Investigations is a nationwide leader in the industry for investigative services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 25 | 224 contacts → | ||||
Exact match “T&M USA provides seamlessly integrated executive protection, investigative and consulting services.” 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 “investigative services”. 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 8,059 investigative services worldwide
See the full list, filter by size, metro and specialty, and access 11,620 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Investigative services worldwide at a glance
As of Nov 6, 2026Companies by employee count
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 investigative services are linked below.
- What qualifies
- Company records worldwide whose business descriptions match “investigative 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. 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 11,620 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.
Investigative services by location
31 lists · largest firstEvery Investigative services list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Investigative services based in the United States3,317
- Investigative services based in the United Kingdom582
- Investigative services based in Italy361
- Investigative services based in India335
- Investigative services based in Canada284
- Investigative services based in Brazil218
- Investigative services based in Australia198
- Investigative services based in France197
- Investigative services based in Spain181
- Investigative services based in South Africa140
- Investigative services based in the Netherlands121
- Investigative services based in Germany99
- Investigative services based in Mexico49
- Investigative services based in Switzerland40
- Investigative services based in New Zealand39
Cities
- Investigative services based in London, United Kingdom179
- Investigative services based in New York, United States99
- Investigative services based in Sao Paulo, Brazil64
- Investigative services based in Houston, United States54
- Investigative services based in Chicago, United States52
- Investigative services based in Miami, United States48
- Investigative services based in Milan, Italy46
- Investigative services based in Los Angeles, United States44
- Investigative services based in Toronto, Canada44
- Investigative services based in Atlanta, United States42
- Investigative services based in Washington, United States38
- Investigative services based in Melbourne, Australia31
- Investigative services based in Sydney, Australia31
- Investigative services based in Orlando, United States29
- Investigative services based in Mumbai, India28
- Investigative services based in Phoenix, United States28
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 “investigative services”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many investigative services are there worldwide?
RevenueBase identified 8,059 company matches for investigative services 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?
Paragon Systems INC tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which country has the most investigative services?
The United States leads with 3,317 companies, followed by the United Kingdom (582) and Italy (361). Every investigative services list by country and city is linked on this page.
Which city has the most investigative services?
London leads with 183 company records, followed by New York (99) and Sao Paulo (64).
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 11,620 professional contacts with verified work emails tracked across these 8,059 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.
Ready to reach these companies? Verified emails and direct dials for all 8,059 investigative services worldwide. Start with a free account, no credit card.
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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.
More company lists
Company intelligence · public preview
Top 25 investigative services worldwide
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 8,059 matching company records for investigative services worldwide, with 75,510 tracked contacts and 11,620 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: November 6, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 investigative services worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  Paragon Systems INCparasys.comHQ: Herndon, VA, United StatesReported employees: 10001+ | Herndon, VA, United States | 10001+ | Exact match | 1,928 contacts → |
“Paragon Systems employs over 10,500 professionals in specialized operations providing security, fire, investigations, inspections, cybersecurity, risk management, and mission…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Banque Populaire Bourgogne Franche-Combanquepopulaire.frHQ: Dijon, FranceReported employees: 1,001-5,000 | Dijon, France | 1,001-5,000 | Exact match | 1,301 contacts → |
“BANQUE POPULAIRE BOURGOGNE FRANCHE-COM is a Security and Investigations company located in 14 BOULEVARD DE LA TREMOUILLE, DIJON, Burgundy, France.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  HKAhka.comHQ: London, United KingdomReported employees: 1,001-5,000 | London, United Kingdom | 1,001-5,000 | Exact match | 1,223 contacts → |
“HKA is the leading global consultancy in risk mitigation, forensic investigations, dispute resolution, expert witness and litigation support services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  EFI Globalefiglobal.comHQ: Memphis, TN, United StatesReported employees: 501-1,000 | Memphis, TN, United States | 501-1,000 | Exact match | 813 contacts → |
“EFI Global is a multidisciplinary consulting firm that helps clients investigate, assess and resolve complex property, infrastructure and financial challenges.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Professional Security Consultants, INCpscsite.comHQ: Los Angeles, CA, United StatesReported employees: 1,001-5,000 | Los Angeles, CA, United States | 1,001-5,000 | Exact match | 697 contacts → |
“Professional Security Consultants, Inc.(PSC) is a world-class provider of security guard services, patrol, investigations, backgrounds, consulting, security screening & specialty…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Omniplex World Services Corporationomniplex.comHQ: Herndon, VA, United StatesReported employees: 1,001-5,000 | Herndon, VA, United States | 1,001-5,000 | Exact match | 696 contacts → |
“OMNIPLEX World Services Corporation is a leader and innovator in delivering professional background investigations, intelligence support, and physical security services to…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  DK Securitydksecurity.comHQ: Grand Rapids, MI, United StatesReported employees: 1,001-5,000 | Grand Rapids, MI, United States | 1,001-5,000 | Exact match | 592 contacts → |
“DK Security is unique in that it offers a single company for a wide ranging availability of security and investigative services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Ranger Americanrangeramerican.comHQ: San Juan, United StatesReported employees: 1,001-5,000 | San Juan, United States | 1,001-5,000 | Exact match | 540 contacts → |
“Founded in 1982, Ranger American is a professional security organization with an extensive background in the security and investigation fields.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  American Security & Investigationsamericansecurityllc.comHQ: St. Paul, IA, United StatesReported employees: 1,001-5,000 | St. Paul, IA, United States | 1,001-5,000 | Exact match | 420 contacts → |
“American Security & Investigations has provided security and investigative services throughout the upper midwest since 1959.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Norred & Associates, INCnorred.comHQ: Atlanta, GA, United StatesReported employees: 501-1,000 | Atlanta, GA, United States | 501-1,000 | Exact match | 378 contacts → |
“A full-service firm with the proven capabilities to manage all facets of your company’s security requirements, Norred & Associates, Inc.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Coventbridge Groupcoventbridge.comHQ: Jacksonville, FL, United StatesReported employees: 501-1,000 | Jacksonville, FL, United States | 501-1,000 | Exact match | 377 contacts → |
“CoventBridge Group is the leading worldwide full service investigation solutions company providing: Surveillance, SIU and Compliance, Claims Investigation, Counter-Fraud Programs…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Vcheckvcheckglobal.comHQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 367 contacts → |
“Vcheck is a global investigations firm that helps institutions protect their investments by providing intelligence on individuals and entities.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Digistream Investigationsdigistream.comHQ: Davis, CA, United StatesReported employees: 201-500 | Davis, CA, United States | 201-500 | Exact match | 359 contacts → |
“DigiStream Investigations is a full-service private investigation firm specializing in insurance defense and legal support services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  S-E-Asealimited.comHQ: Columbus, OH, United StatesReported employees: 201-500 | Columbus, OH, United States | 201-500 | Exact match | 310 contacts → |
“Established in 1970, S-E-A is a recognized worldwide leader in forensic analysis and investigation.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Guidepost Solutionsguidepostsolutions.comHQ: New York, IL, United StatesReported employees: 201-500 | New York, IL, United States | 201-500 | Exact match | 292 contacts → |
“We stand at the forefront of leadership, insight, and guidance in a world marked by complexity and uncertainty.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  GSG Protective Servicesgsgprotective.comHQ: Lawndale, CA, United StatesReported employees: 501-1,000 | Lawndale, CA, United States | 501-1,000 | Exact match | 292 contacts → |
“GSG Protective Services is a full-service provider of quality security services specializing in 6 divisions: investigations, physical security, protective services, technology…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Delta Groupdeltagroup.netHQ: Buford, GA, IndiaReported employees: 501-1,000 | Buford, GA, India | 501-1,000 | Exact match | 262 contacts → |
“Formally known as Delta Associated Investigations, Delta Group is a National Fraud Management organization that has been serving the Property Casualty & Disability marketplace for…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  ADC LTD NMadcltdnm.comHQ: Albuquerque, NM, United StatesReported employees: 501-1,000 | Albuquerque, NM, United States | 501-1,000 | Exact match | 252 contacts → |
“ADC supports government and corporate clients with two primary services - personnel security, ranging from pre-employment checks to comprehensive background investigations and…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  Iiris Consulting Pvt. LTDiirisconsulting.comHQ: Gurgaon, IndiaReported employees: 51-200 | Gurgaon, India | 51-200 | Exact match | 246 contacts → |
“IIRIS operating under its distinct business offerings "IntelliRisk"(IR),"IntelliSense"(IS),"Security Design" and "Brand Protection" seeks to provide comprehensive intelligence…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  Aperture LLCaperturellc.comHQ: Arlington, CA, United StatesReported employees: 201-500 | Arlington, CA, United States | 201-500 | Exact match | 243 contacts → |
“A national portfolio of premier forensic services companies, Aperture uses proven science and accepted industry standards to deliver accurate and efficient expert analysis.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | HUB Enterprises, INChubenterprises.com HQ: Broussard, LA, United StatesReported employees: 501-1,000 | Broussard, LA, United States | 501-1,000 | Exact match | 237 contacts → |
“HUB Enterprises is a national insurance defense investigative firm.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | HQ: Markham, ON, CanadaReported employees: 1,001-5,000 | Markham, ON, Canada | 1,001-5,000 | Exact match | 235 contacts → |
“Xpera has been a trusted partner to businesses and governments for over 50 years.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  Vets Securing Americavetssecuringamerica.comHQ: San Antonio, TX, United StatesReported employees: 5,001-10,000 | San Antonio, TX, United States | 5,001-10,000 | Exact match | 232 contacts → |
“Full Service Security and Investigative company serving the government sector.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  Advantage Investigationsadvantageinvestigations.comHQ: Kannapolis, WA, United StatesReported employees: 201-500 | Kannapolis, WA, United States | 201-500 | Exact match | 225 contacts → |
“Advantage Investigations is a nationwide leader in the industry for investigative services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  T&m Usa, LLCtmusallc.comHQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 224 contacts → |
“T&M USA provides seamlessly integrated executive protection, investigative and consulting services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 8,059 company matches
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Investigative services: dataset insights
November 6, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
7,961 records in the displayed employee bands.
98 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 8,059 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: November 6, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Investigative services by location
31 lists · largest firstEvery Investigative services list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Investigative services based in the United States3,317
- Investigative services based in the United Kingdom582
- Investigative services based in Italy361
- Investigative services based in India335
- Investigative services based in Canada284
- Investigative services based in Brazil218
- Investigative services based in Australia198
- Investigative services based in France197
- Investigative services based in Spain181
- Investigative services based in South Africa140
- Investigative services based in the Netherlands121
- Investigative services based in Germany99
- Investigative services based in Mexico49
- Investigative services based in Switzerland40
- Investigative services based in New Zealand39
Cities
- Investigative services based in London, United Kingdom179
- Investigative services based in New York, United States99
- Investigative services based in Sao Paulo, Brazil64
- Investigative services based in Houston, United States54
- Investigative services based in Chicago, United States52
- Investigative services based in Miami, United States48
- Investigative services based in Milan, Italy46
- Investigative services based in Los Angeles, United States44
- Investigative services based in Toronto, Canada44
- Investigative services based in Atlanta, United States42
- Investigative services based in Washington, United States38
- Investigative services based in Melbourne, Australia31
- Investigative services based in Sydney, Australia31
- Investigative services based in Orlando, United States29
- Investigative services based in Mumbai, India28
- Investigative services based in Phoenix, United States28
Questions about this company list
What does Exact match mean for investigative services?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many investigative services did RevenueBase find worldwide?
The saved snapshot records 8,059 matching company records, 75,510 tracked contacts and 11,620 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: November 6, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Browse the directory
Cite this list
RevenueBase Data Team. Top 25 investigative services worldwide. Snapshot: November 6, 2026. https://revenuebase.ai/companies/browse/investigative-services.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
Company intelligence · public preview
Top 25 investigative services worldwide
RevenueBase records 8,059 matching company records for investigative services worldwide, with 75,510 tracked contacts and 11,620 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: November 6, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 investigative services worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | Paragon Systems INCparasys.com HQ: Herndon, VA, United StatesReported employees: 10001+ | Herndon, VA, United States | 10001+ | Exact match | 1,928 contacts → |
“Paragon Systems employs over 10,500 professionals in specialized operations providing security, fire, investigations, inspections, cybersecurity, risk management, and mission…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Banque Populaire Bourgogne Franche-Combanquepopulaire.fr HQ: Dijon, FranceReported employees: 1,001-5,000 | Dijon, France | 1,001-5,000 | Exact match | 1,301 contacts → |
“BANQUE POPULAIRE BOURGOGNE FRANCHE-COM is a Security and Investigations company located in 14 BOULEVARD DE LA TREMOUILLE, DIJON, Burgundy, France.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | HKAhka.com HQ: London, United KingdomReported employees: 1,001-5,000 | London, United Kingdom | 1,001-5,000 | Exact match | 1,223 contacts → |
“HKA is the leading global consultancy in risk mitigation, forensic investigations, dispute resolution, expert witness and litigation support services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | EFI Globalefiglobal.com HQ: Memphis, TN, United StatesReported employees: 501-1,000 | Memphis, TN, United States | 501-1,000 | Exact match | 813 contacts → |
“EFI Global is a multidisciplinary consulting firm that helps clients investigate, assess and resolve complex property, infrastructure and financial challenges.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Professional Security Consultants, INCpscsite.com HQ: Los Angeles, CA, United StatesReported employees: 1,001-5,000 | Los Angeles, CA, United States | 1,001-5,000 | Exact match | 697 contacts → |
“Professional Security Consultants, Inc.(PSC) is a world-class provider of security guard services, patrol, investigations, backgrounds, consulting, security screening & specialty…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Omniplex World Services Corporationomniplex.com HQ: Herndon, VA, United StatesReported employees: 1,001-5,000 | Herndon, VA, United States | 1,001-5,000 | Exact match | 696 contacts → |
“OMNIPLEX World Services Corporation is a leader and innovator in delivering professional background investigations, intelligence support, and physical security services to…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | DK Securitydksecurity.com HQ: Grand Rapids, MI, United StatesReported employees: 1,001-5,000 | Grand Rapids, MI, United States | 1,001-5,000 | Exact match | 592 contacts → |
“DK Security is unique in that it offers a single company for a wide ranging availability of security and investigative services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Ranger Americanrangeramerican.com HQ: San Juan, United StatesReported employees: 1,001-5,000 | San Juan, United States | 1,001-5,000 | Exact match | 540 contacts → |
“Founded in 1982, Ranger American is a professional security organization with an extensive background in the security and investigation fields.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | American Security & Investigationsamericansecurityllc.com HQ: St. Paul, IA, United StatesReported employees: 1,001-5,000 | St. Paul, IA, United States | 1,001-5,000 | Exact match | 420 contacts → |
“American Security & Investigations has provided security and investigative services throughout the upper midwest since 1959.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Norred & Associates, INCnorred.com HQ: Atlanta, GA, United StatesReported employees: 501-1,000 | Atlanta, GA, United States | 501-1,000 | Exact match | 378 contacts → |
“A full-service firm with the proven capabilities to manage all facets of your company’s security requirements, Norred & Associates, Inc.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Coventbridge Groupcoventbridge.com HQ: Jacksonville, FL, United StatesReported employees: 501-1,000 | Jacksonville, FL, United States | 501-1,000 | Exact match | 377 contacts → |
“CoventBridge Group is the leading worldwide full service investigation solutions company providing: Surveillance, SIU and Compliance, Claims Investigation, Counter-Fraud Programs…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Vcheckvcheckglobal.com HQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 367 contacts → |
“Vcheck is a global investigations firm that helps institutions protect their investments by providing intelligence on individuals and entities.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Digistream Investigationsdigistream.com HQ: Davis, CA, United StatesReported employees: 201-500 | Davis, CA, United States | 201-500 | Exact match | 359 contacts → |
“DigiStream Investigations is a full-service private investigation firm specializing in insurance defense and legal support services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | S-E-Asealimited.com HQ: Columbus, OH, United StatesReported employees: 201-500 | Columbus, OH, United States | 201-500 | Exact match | 310 contacts → |
“Established in 1970, S-E-A is a recognized worldwide leader in forensic analysis and investigation.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Guidepost Solutionsguidepostsolutions.com HQ: New York, IL, United StatesReported employees: 201-500 | New York, IL, United States | 201-500 | Exact match | 292 contacts → |
“We stand at the forefront of leadership, insight, and guidance in a world marked by complexity and uncertainty.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | GSG Protective Servicesgsgprotective.com HQ: Lawndale, CA, United StatesReported employees: 501-1,000 | Lawndale, CA, United States | 501-1,000 | Exact match | 292 contacts → |
“GSG Protective Services is a full-service provider of quality security services specializing in 6 divisions: investigations, physical security, protective services, technology…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Delta Groupdeltagroup.net HQ: Buford, GA, IndiaReported employees: 501-1,000 | Buford, GA, India | 501-1,000 | Exact match | 262 contacts → |
“Formally known as Delta Associated Investigations, Delta Group is a National Fraud Management organization that has been serving the Property Casualty & Disability marketplace for…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | ADC LTD NMadcltdnm.com HQ: Albuquerque, NM, United StatesReported employees: 501-1,000 | Albuquerque, NM, United States | 501-1,000 | Exact match | 252 contacts → |
“ADC supports government and corporate clients with two primary services - personnel security, ranging from pre-employment checks to comprehensive background investigations and…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Iiris Consulting Pvt. LTDiirisconsulting.com HQ: Gurgaon, IndiaReported employees: 51-200 | Gurgaon, India | 51-200 | Exact match | 246 contacts → |
“IIRIS operating under its distinct business offerings "IntelliRisk"(IR),"IntelliSense"(IS),"Security Design" and "Brand Protection" seeks to provide comprehensive intelligence…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Aperture LLCaperturellc.com HQ: Arlington, CA, United StatesReported employees: 201-500 | Arlington, CA, United States | 201-500 | Exact match | 243 contacts → |
“A national portfolio of premier forensic services companies, Aperture uses proven science and accepted industry standards to deliver accurate and efficient expert analysis.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | HUB Enterprises, INChubenterprises.com HQ: Broussard, LA, United StatesReported employees: 501-1,000 | Broussard, LA, United States | 501-1,000 | Exact match | 237 contacts → |
“HUB Enterprises is a national insurance defense investigative firm.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | HQ: Markham, ON, CanadaReported employees: 1,001-5,000 | Markham, ON, Canada | 1,001-5,000 | Exact match | 235 contacts → |
“Xpera has been a trusted partner to businesses and governments for over 50 years.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Vets Securing Americavetssecuringamerica.com HQ: San Antonio, TX, United StatesReported employees: 5,001-10,000 | San Antonio, TX, United States | 5,001-10,000 | Exact match | 232 contacts → |
“Full Service Security and Investigative company serving the government sector.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Advantage Investigationsadvantageinvestigations.com HQ: Kannapolis, WA, United StatesReported employees: 201-500 | Kannapolis, WA, United States | 201-500 | Exact match | 225 contacts → |
“Advantage Investigations is a nationwide leader in the industry for investigative services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | T&m Usa, LLCtmusallc.com HQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 224 contacts → |
“T&M USA provides seamlessly integrated executive protection, investigative and consulting services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 8,059 company matches
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Investigative services: dataset insights
November 6, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
7,961 records in the displayed employee bands.
98 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 8,059 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: November 6, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Investigative services by location
31 lists · largest firstEvery Investigative services list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Investigative services based in the United States3,317
- Investigative services based in the United Kingdom582
- Investigative services based in Italy361
- Investigative services based in India335
- Investigative services based in Canada284
- Investigative services based in Brazil218
- Investigative services based in Australia198
- Investigative services based in France197
- Investigative services based in Spain181
- Investigative services based in South Africa140
- Investigative services based in the Netherlands121
- Investigative services based in Germany99
- Investigative services based in Mexico49
- Investigative services based in Switzerland40
- Investigative services based in New Zealand39
Cities
- Investigative services based in London, United Kingdom179
- Investigative services based in New York, United States99
- Investigative services based in Sao Paulo, Brazil64
- Investigative services based in Houston, United States54
- Investigative services based in Chicago, United States52
- Investigative services based in Miami, United States48
- Investigative services based in Milan, Italy46
- Investigative services based in Los Angeles, United States44
- Investigative services based in Toronto, Canada44
- Investigative services based in Atlanta, United States42
- Investigative services based in Washington, United States38
- Investigative services based in Melbourne, Australia31
- Investigative services based in Sydney, Australia31
- Investigative services based in Orlando, United States29
- Investigative services based in Mumbai, India28
- Investigative services based in Phoenix, United States28
Questions about this company list
What does Exact match mean for investigative services?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many investigative services did RevenueBase find worldwide?
The saved snapshot records 8,059 matching company records, 75,510 tracked contacts and 11,620 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: November 6, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
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Cite this list
RevenueBase Data Team. Top 25 investigative services worldwide. Snapshot: November 6, 2026. https://revenuebase.ai/companies/browse/investigative-services.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗