Company lists · Data refreshed September 2026
Top 25 Private investigation firms based in the United States
RevenueBase identified 1,920 company matches for private investigation firms associated with the United States as of September 2026 and tracks 13,102 professional contacts across them, including 3,213 with verified work emails. New York is the largest hub.
This list covers company matches for private investigation firms associated with the United States, 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 September 20, 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.
The 25 largest private investigation firms based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 677 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 · Sep 20, 2026 · View company records in RevenueBase | |||||
| 2 | 572 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 · Sep 20, 2026 · View company records in RevenueBase | |||||
| 3 | 518 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 · Sep 20, 2026 · View company records in RevenueBase | |||||
| 4 | 336 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 · Sep 20, 2026 · View company records in RevenueBase | |||||
| 5 | 327 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 · Sep 20, 2026 · View company records in RevenueBase | |||||
| 6 | 292 contacts → | ||||
Exact match “HUB Enterprises is a national insurance defense investigative firm.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 7 | 214 contacts → | ||||
Exact match “Frasco has hundreds of investigators and regional offices located throughout the country.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 8 | 214 contacts → | ||||
Exact match “Advantage Investigations is a nationwide leader in the industry for investigative services.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 9 | 146 contacts → | ||||
Exact match “A federally qualified Small Business, IDS offers end to end investigative solutions tailored to meet the specific needs of our clients.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 10 | 129 contacts → | ||||
Exact match “Beau Dietl & Associates is a premier private investigation firm based in New York City with offices in New Jersey, Florida, and California.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 11 | 119 contacts → | ||||
Exact match “Knowledge is power" Whether you are an insurance company, TPA, insurance defense law firm, risk manager, private law firm, or corporation / business owner, we at Lemieux &…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 12 | 112 contacts → | ||||
Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 13 | 107 contacts → | ||||
Exact match “Alias Intelligence is a leading background investigations and due diligence company delivering the information and insights our clients need to grow and navigate their businesses.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 14 | 104 contacts → | ||||
Exact match “The Robison Group is an agency of professional investigators and support teams offering surveillance, SIU claims, business risk mitigation and comprehensive desktop investigation…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 15 | 94 contacts → | ||||
Exact match “Why Becker & Company?” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 16 | 84 contacts → | ||||
Exact match “Marshall Investigative Group, division of Sphere Investigations, is a recognized leader in fraud and corporate investigations with more than 30 years of experience across North…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 17 | 84 contacts → | ||||
Exact match “Horsemen Investigations is a full service investigation company, specializing in investigating insurance fraud and in minimizing risk exposure.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 18 | 82 contacts → | ||||
Exact match “AJ Squared Security, Inc.(AJ2), is a privately owned security organization founded in May 2003 and incorporated in November 2003.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 19 | 72 contacts → | ||||
Exact match “Integrated Security Services, Inc.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 20 | 69 contacts → | ||||
Exact match “CSI is a full-service investigative firm that delivers key facts to give our clients an actionable advantage in a wide range of situations.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 21 | 68 contacts → | ||||
Exact match “Hiring the right people isn’t just about checking a box-it’s about ensuring accuracy, mitigating risk, and protecting your organization.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 22 | 68 contacts → | ||||
Exact match “At CITY SAFE PARTNERS SECURITY, we create solutions and put systems in place to ensure that people and businesses are secure.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 23 | 67 contacts → | ||||
Exact match “Claims Bureau USA has been providing Insurers, TPA's and their defense counsel with quality, in-depth investigative services since 1956.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 24 | 66 contacts → | ||||
Exact match “Investigative Group International (IGI) is the premier investigative firm conducting independent, high-touch investigations worldwide.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 25 | 64 contacts → | ||||
Exact match “Founded in 1978, Smith & Carson is a trusted and highly experienced investigative research firm that partners with the world's leading organizations to handle complex…” Recorded in the RevenueBase company graph · Sep 20, 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 “private 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 1,920 private investigation firms based in the United States
See the full list, filter by size, metro and specialty, and access 3,213 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Private investigation firms based in the United States at a glance
As of Sep 20, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,920 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 States whose business descriptions match “private 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. 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 3,213 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 September 20, 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.
Private investigation firms 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 “private investigation firms”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many private investigation firms are there based in the United States?
RevenueBase identified 1,920 company matches for private investigation firms associated with the United States as of September 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?
Omniplex World Services Corporation tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which city has the most private investigation firms?
New York leads with 64 company records, followed by Miami (29) and Chicago (27).
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 3,213 professional contacts with verified work emails tracked across these 1,920 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 September 20, 2026.
Ready to reach these companies? Verified emails and direct dials for all 1,920 private investigation firms based in the United States. Start with a free account, no credit card.
Download this list →Related lists
Private investigation firms by geography
- Private investigation firms based in Chicago, United States
- Private investigation firms based in Houston, United States
- Private investigation firms based in Miami, United States
- Private investigation firms based in New York, United States
- Private investigation firms based in Australia
- Private investigation firms based in Canada
- Private investigation firms based in Italy
- Private investigation firms based in the Netherlands
- Private investigation firms based in Spain
- Private investigation firms based in the United Kingdom
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
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Private investigation firms based in Chicago, United States
- Private investigation firms based in Houston, United States
- Private investigation firms based in Miami, United States
- Private investigation firms based in New York, United States
- Private investigation firms based in Australia
- Private investigation firms based in Canada
Company intelligence · public preview
Top 25 private investigation firms based in the United States
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 1,920 matching company records for private investigation firms based in the United States, with 13,102 tracked contacts and 3,213 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: September 20, 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 private investigation firms based in the United States
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 |  Omniplex World Services Corporationomniplex.comHQ: Herndon, VA, United StatesReported employees: 1,001-5,000 | Herndon, VA, United States | 1,001-5,000 | Exact match | 677 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 · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  DK Securitydksecurity.comHQ: Grand Rapids, MI, United StatesReported employees: 1,001-5,000 | Grand Rapids, MI, United States | 1,001-5,000 | Exact match | 572 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 · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Coventbridge Groupcoventbridge.comHQ: Jacksonville, FL, United StatesReported employees: 501-1,000 | Jacksonville, FL, United States | 501-1,000 | Exact match | 518 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 · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Vcheckvcheckglobal.comHQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 336 contacts → |
“Vcheck is a global investigations firm that helps institutions protect their investments by providing intelligence on individuals and entities.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Digistream Investigationsdigistream.com HQ: Davis, CA, United StatesReported employees: 201-500 | Davis, CA, United States | 201-500 | Exact match | 327 contacts → |
“DigiStream Investigations is a full-service private investigation firm specializing in insurance defense and legal support services.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | HUB Enterprises, INChubenterprises.com HQ: Broussard, LA, United StatesReported employees: 501-1,000 | Broussard, LA, United States | 501-1,000 | Exact match | 292 contacts → |
“HUB Enterprises is a national insurance defense investigative firm.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Frascofrasco.comHQ: Irvine, CA, United StatesReported employees: 201-500 | Irvine, CA, United States | 201-500 | Exact match | 214 contacts → |
“Frasco has hundreds of investigators and regional offices located throughout the country.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Advantage Investigationsadvantageinvestigations.comHQ: Kannapolis, NC, United StatesReported employees: 201-500 | Kannapolis, NC, United States | 201-500 | Exact match | 214 contacts → |
“Advantage Investigations is a nationwide leader in the industry for investigative services.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Information Discovery Services LLCinformationdiscovery.netHQ: Fort Worth, TX, United StatesReported employees: 51-200 | Fort Worth, TX, United States | 51-200 | Exact match | 146 contacts → |
“A federally qualified Small Business, IDS offers end to end investigative solutions tailored to meet the specific needs of our clients.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Beau Dietl & Associatesinvestigations.com HQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 129 contacts → |
“Beau Dietl & Associates is a premier private investigation firm based in New York City with offices in New Jersey, Florida, and California.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Lemieux & Associateslemieuxassociates.com HQ: North Haven, CT, United StatesReported employees: 501-1,000 | North Haven, CT, United States | 501-1,000 | Exact match | 119 contacts → |
“Knowledge is power" Whether you are an insurance company, TPA, insurance defense law firm, risk manager, private law firm, or corporation / business owner, we at Lemieux &…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Nardello & COnardelloandco.com HQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 112 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 13 |  Alias Intelligencealiasintelligence.comHQ: Los Angeles, TX, United StatesReported employees: 51-200 | Los Angeles, TX, United States | 51-200 | Exact match | 107 contacts → |
“Alias Intelligence is a leading background investigations and due diligence company delivering the information and insights our clients need to grow and navigate their businesses.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | The Robison Grouptherobisongroup.com HQ: Troy, MI, United StatesReported employees: 201-500 | Troy, MI, United States | 201-500 | Exact match | 104 contacts → |
“The Robison Group is an agency of professional investigators and support teams offering surveillance, SIU claims, business risk mitigation and comprehensive desktop investigation…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Becker & Company, INCbeckerpi.com HQ: United StatesReported employees: 201-500 | United States | 201-500 | Exact match | 94 contacts → |
“Why Becker & Company?” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Marshall Investigative Group LLCmi-pi.comHQ: Park Ridge, IL, United StatesReported employees: 201-500 | Park Ridge, IL, United States | 201-500 | Exact match | 84 contacts → |
“Marshall Investigative Group, division of Sphere Investigations, is a recognized leader in fraud and corporate investigations with more than 30 years of experience across North…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Horsemen Investigationshorsemeninc.com HQ: Huntington Beach, CA, United StatesReported employees: 51-200 | Huntington Beach, CA, United States | 51-200 | Exact match | 84 contacts → |
“Horsemen Investigations is a full service investigation company, specializing in investigating insurance fraud and in minimizing risk exposure.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  AJ Squared Securityaj2security.comHQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 82 contacts → |
“AJ Squared Security, Inc.(AJ2), is a privately owned security organization founded in May 2003 and incorporated in November 2003.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  Integrated Security Servicesintesecurity.comHQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 72 contacts → |
“Integrated Security Services, Inc.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  CSI Corporate Security And Investigationscsiinvestigators.comHQ: Monaca, PA, United StatesReported employees: 201-500 | Monaca, PA, United States | 201-500 | Exact match | 69 contacts → |
“CSI is a full-service investigative firm that delivers key facts to give our clients an actionable advantage in a wide range of situations.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | THUROthuro.ai HQ: Cleveland, OH, United StatesReported employees: 51-200 | Cleveland, OH, United States | 51-200 | Exact match | 68 contacts → |
“Hiring the right people isn’t just about checking a box-it’s about ensuring accuracy, mitigating risk, and protecting your organization.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  City Safe Partnerscitysafepartners.comHQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 68 contacts → |
“At CITY SAFE PARTNERS SECURITY, we create solutions and put systems in place to ensure that people and businesses are secure.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  Claims Bureau USAclaimsbureau.comHQ: Woburn, MA, United StatesReported employees: 201-500 | Woburn, MA, United States | 201-500 | Exact match | 67 contacts → |
“Claims Bureau USA has been providing Insurers, TPA's and their defense counsel with quality, in-depth investigative services since 1956.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Investigative Group Internationaligint.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 66 contacts → |
“Investigative Group International (IGI) is the premier investigative firm conducting independent, high-touch investigations worldwide.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Smith & Carsonsmithcarson.com HQ: Alpharetta, GA, United StatesReported employees: 51-200 | Alpharetta, GA, United States | 51-200 | Exact match | 64 contacts → |
“Founded in 1978, Smith & Carson is a trusted and highly experienced investigative research firm that partners with the world's leading organizations to handle complex…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 1,920 company matches
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Private investigation firms: dataset insights
September 20, 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
1,915 records in the displayed employee bands.
5 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 worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,920 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: September 20, 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 ↗
Private investigation firms by metro
Questions about this company list
What does Exact match mean for private investigation firms?
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 private investigation firms did RevenueBase find based in the United States?
The saved snapshot records 1,920 matching company records, 13,102 tracked contacts and 3,213 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: September 20, 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
Private investigation firms by geography
- Private investigation firms based in Chicago, United States
- Private investigation firms based in Houston, United States
- Private investigation firms based in Miami, United States
- Private investigation firms based in New York, United States
- Private investigation firms based in Australia
- Private investigation firms based in Canada
- Private investigation firms based in Italy
- Private investigation firms based in the Netherlands
- Private investigation firms based in Spain
- Private investigation firms based in the United Kingdom
Cite this list
RevenueBase Data Team. Top 25 private investigation firms based in the United States. Snapshot: September 20, 2026. https://revenuebase.ai/companies/private-investigation-firms/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Private investigation firms based in Chicago, United States
- Private investigation firms based in Houston, United States
- Private investigation firms based in Miami, United States
- Private investigation firms based in New York, United States
- Private investigation firms based in Australia
- Private investigation firms based in Canada
Company intelligence · public preview
Top 25 private investigation firms based in the United States
RevenueBase records 1,920 matching company records for private investigation firms based in the United States, with 13,102 tracked contacts and 3,213 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: September 20, 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 private investigation firms based in the United States
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 | 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 | 677 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 · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | 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 | 572 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 · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Coventbridge Groupcoventbridge.com HQ: Jacksonville, FL, United StatesReported employees: 501-1,000 | Jacksonville, FL, United States | 501-1,000 | Exact match | 518 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 · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Vcheckvcheckglobal.com HQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 336 contacts → |
“Vcheck is a global investigations firm that helps institutions protect their investments by providing intelligence on individuals and entities.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Digistream Investigationsdigistream.com HQ: Davis, CA, United StatesReported employees: 201-500 | Davis, CA, United States | 201-500 | Exact match | 327 contacts → |
“DigiStream Investigations is a full-service private investigation firm specializing in insurance defense and legal support services.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | HUB Enterprises, INChubenterprises.com HQ: Broussard, LA, United StatesReported employees: 501-1,000 | Broussard, LA, United States | 501-1,000 | Exact match | 292 contacts → |
“HUB Enterprises is a national insurance defense investigative firm.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Frascofrasco.com HQ: Irvine, CA, United StatesReported employees: 201-500 | Irvine, CA, United States | 201-500 | Exact match | 214 contacts → |
“Frasco has hundreds of investigators and regional offices located throughout the country.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Advantage Investigationsadvantageinvestigations.com HQ: Kannapolis, NC, United StatesReported employees: 201-500 | Kannapolis, NC, United States | 201-500 | Exact match | 214 contacts → |
“Advantage Investigations is a nationwide leader in the industry for investigative services.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Information Discovery Services LLCinformationdiscovery.net HQ: Fort Worth, TX, United StatesReported employees: 51-200 | Fort Worth, TX, United States | 51-200 | Exact match | 146 contacts → |
“A federally qualified Small Business, IDS offers end to end investigative solutions tailored to meet the specific needs of our clients.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Beau Dietl & Associatesinvestigations.com HQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 129 contacts → |
“Beau Dietl & Associates is a premier private investigation firm based in New York City with offices in New Jersey, Florida, and California.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Lemieux & Associateslemieuxassociates.com HQ: North Haven, CT, United StatesReported employees: 501-1,000 | North Haven, CT, United States | 501-1,000 | Exact match | 119 contacts → |
“Knowledge is power" Whether you are an insurance company, TPA, insurance defense law firm, risk manager, private law firm, or corporation / business owner, we at Lemieux &…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Nardello & COnardelloandco.com HQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 112 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 13 | Alias Intelligencealiasintelligence.com HQ: Los Angeles, TX, United StatesReported employees: 51-200 | Los Angeles, TX, United States | 51-200 | Exact match | 107 contacts → |
“Alias Intelligence is a leading background investigations and due diligence company delivering the information and insights our clients need to grow and navigate their businesses.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | The Robison Grouptherobisongroup.com HQ: Troy, MI, United StatesReported employees: 201-500 | Troy, MI, United States | 201-500 | Exact match | 104 contacts → |
“The Robison Group is an agency of professional investigators and support teams offering surveillance, SIU claims, business risk mitigation and comprehensive desktop investigation…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Becker & Company, INCbeckerpi.com HQ: United StatesReported employees: 201-500 | United States | 201-500 | Exact match | 94 contacts → |
“Why Becker & Company?” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Marshall Investigative Group LLCmi-pi.com HQ: Park Ridge, IL, United StatesReported employees: 201-500 | Park Ridge, IL, United States | 201-500 | Exact match | 84 contacts → |
“Marshall Investigative Group, division of Sphere Investigations, is a recognized leader in fraud and corporate investigations with more than 30 years of experience across North…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Horsemen Investigationshorsemeninc.com HQ: Huntington Beach, CA, United StatesReported employees: 51-200 | Huntington Beach, CA, United States | 51-200 | Exact match | 84 contacts → |
“Horsemen Investigations is a full service investigation company, specializing in investigating insurance fraud and in minimizing risk exposure.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | AJ Squared Securityaj2security.com HQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 82 contacts → |
“AJ Squared Security, Inc.(AJ2), is a privately owned security organization founded in May 2003 and incorporated in November 2003.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Integrated Security Servicesintesecurity.com HQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 72 contacts → |
“Integrated Security Services, Inc.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | CSI Corporate Security And Investigationscsiinvestigators.com HQ: Monaca, PA, United StatesReported employees: 201-500 | Monaca, PA, United States | 201-500 | Exact match | 69 contacts → |
“CSI is a full-service investigative firm that delivers key facts to give our clients an actionable advantage in a wide range of situations.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | THUROthuro.ai HQ: Cleveland, OH, United StatesReported employees: 51-200 | Cleveland, OH, United States | 51-200 | Exact match | 68 contacts → |
“Hiring the right people isn’t just about checking a box-it’s about ensuring accuracy, mitigating risk, and protecting your organization.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | City Safe Partnerscitysafepartners.com HQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 68 contacts → |
“At CITY SAFE PARTNERS SECURITY, we create solutions and put systems in place to ensure that people and businesses are secure.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Claims Bureau USAclaimsbureau.com HQ: Woburn, MA, United StatesReported employees: 201-500 | Woburn, MA, United States | 201-500 | Exact match | 67 contacts → |
“Claims Bureau USA has been providing Insurers, TPA's and their defense counsel with quality, in-depth investigative services since 1956.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Investigative Group Internationaligint.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 66 contacts → |
“Investigative Group International (IGI) is the premier investigative firm conducting independent, high-touch investigations worldwide.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Smith & Carsonsmithcarson.com HQ: Alpharetta, GA, United StatesReported employees: 51-200 | Alpharetta, GA, United States | 51-200 | Exact match | 64 contacts → |
“Founded in 1978, Smith & Carson is a trusted and highly experienced investigative research firm that partners with the world's leading organizations to handle complex…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
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Private investigation firms: dataset insights
September 20, 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
1,915 records in the displayed employee bands.
5 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 worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,920 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: September 20, 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 ↗
Private investigation firms by metro
Questions about this company list
What does Exact match mean for private investigation firms?
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 private investigation firms did RevenueBase find based in the United States?
The saved snapshot records 1,920 matching company records, 13,102 tracked contacts and 3,213 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: September 20, 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
Private investigation firms by geography
- Private investigation firms based in Chicago, United States
- Private investigation firms based in Houston, United States
- Private investigation firms based in Miami, United States
- Private investigation firms based in New York, United States
- Private investigation firms based in Australia
- Private investigation firms based in Canada
- Private investigation firms based in Italy
- Private investigation firms based in the Netherlands
- Private investigation firms based in Spain
- Private investigation firms based in the United Kingdom
Cite this list
RevenueBase Data Team. Top 25 private investigation firms based in the United States. Snapshot: September 20, 2026. https://revenuebase.ai/companies/private-investigation-firms/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
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- Private investigation firms based in Chicago, United States
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- Private investigation firms based in New York, United States
- Private investigation firms based in Australia
- Private investigation firms based in Canada