Company lists · Data refreshed September 2026

Top 25 Private investigation firms based in New York, United States

RevenueBase identified 62 company matches for private investigation firms associated with New York, United States as of September 2026 and tracks 1,234 professional contacts across them, including 457 with verified work emails. Across the United States, New York is the largest hub for this category.

This list covers company matches for private investigation firms associated with New York, 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.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 20, 2026 How this list was built
62Companies
1,234Contacts tracked
457Verified emails
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The 25 largest private investigation firms based in New York, United States

Ranked by team size
Top 25 of 62 company matches for private investigation firms based in New York, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 20, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchNew York, NY, United StatesHQ recorded Sep 20, 2026201-500336 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
2Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202651-200129 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
3Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202651-200112 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
4Exact matchNew York, NY, United StatesHQ recorded Sep 20, 2026201-50082 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
5Exact matchNew York, NY, United StatesHQ recorded Sep 20, 2026201-50072 contacts →

Exact match

“Integrated Security Services, Inc.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
6Exact matchNew York, NY, United StatesHQ recorded Sep 20, 2026201-50068 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
7Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202651-20042 contacts →

Exact match

“Hilton Global Associates is a professional investigative research firm providing expert due diligence and unparalleled client service.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
8Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202611-5035 contacts →

Exact match

“Quinlan Partners is a global due diligence, investigations and business intelligence firm whose team of top former investigative journalists, corporate intelligence and…”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
9Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202611-5029 contacts →

Exact match

“Corporate Resolutions Inc.(CRI) specializes in background investigations for the alternative investment and legal communities.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
10Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202611-5024 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
11Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202611-5022 contacts →

Exact match

“XG Consultants Group, founded by a former FBI Supervisory Special Agent, is a global private investigative firm specializing in background screenings, social media research…”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
12Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202611-5022 contacts →

Exact match

“SI Global Partners is an independent global investigation and security consulting firm founded in 2021.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
13Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202611-5012 contacts →

Exact match

“ICORP is an industry leader in investigation and surveillance services.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
14Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202611-5011 contacts →

Exact match

“John Cutter Investigations Inc.(JCI) was founded by former NYPD Deputy Chief John Cutter after a decorated 25-year career.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
15Exact matchNew York, NY, United StatesHQ recorded Sep 20, 20261-109 contacts →

Exact match

“NAXO is an investigations and digital forensics firm trusted by top law firms, corporations, and law enforcement agencies for their most technically complex cases.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
16Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202611-505 contacts →

Exact match

“Retired DEA Special Agent Jack Teitelman brings his extensive experience in law enforcement to The TITAN GROUP, with more than three decades of continuous leadership and expertise…”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
17Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202611-504 contacts →

Exact match

“New York State's leading and award-winning Investigation firm serving all of New York State since 2005.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
18Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202611-504 contacts →

Exact match

“OUR COMPANY RiginAir Company specializes in confidential sales, marketing and business development projects.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
19Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202651-2003 contacts →

Exact match

“Undisputed Legal Inc, is a licensed and fully insured New York legal support agency.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
20Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202611-503 contacts →

Exact match

“A global firm of experienced professionals who provide National and International Professional Investigations for all corporate, financial, legal, personal and insurance matters.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
21Exact matchNew York, United StatesHQ recorded Sep 20, 20261-103 contacts →

Exact match

“Telescope is an investigations and intelligence firm.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
22Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202611-502 contacts →

Exact match

“North American Investigations, Inc.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
23Exact matchNew York, NY, United StatesHQ recorded Sep 20, 20261-102 contacts →

Exact match

“Asher Research conducts investigations for law firms, financial institutions, businesses, trade associations and advocacy groups.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
24Exact matchNew York, NY, United StatesHQ recorded Sep 20, 202611-502 contacts →

Exact match

“Globally trusted background check and intelligence firm, headquartered in New York City.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
25Exact matchNew York, NY, United StatesHQ recorded Sep 20, 20261-102 contacts →

Exact match

“Global Investigative Services is a full-service New York State licensed investigative company providing comprehensive solutions to complex investigative challenges.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase

Showing 25 of 62 private investigation firms based in New York, United States

See the full list, filter by size, metro and specialty, and access 457 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Private investigation firms based in New York, United States at a glance

As of Sep 20, 2026
37.0%Verified-email coverage
19.9Average contacts per company
11-50Median size (employees)
Sep 20, 2026Page data refreshed

Companies by employee count

1-10
26
11-50
22
51-200
9
201-500
5

Email recency for this list is measured across the whole United States list rather than for New York, so it is reported there. Company counts and contact totals on this page are exact for New York, over 62 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 New York, 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 457 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.

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 New York, United States?

RevenueBase identified 62 company matches for private investigation firms associated with New York, 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?

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

Which city in the United States has the most private investigation firms?

New York leads the United States with 62 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 457 professional contacts with verified work emails tracked across these 62 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.

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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.