- Accetta Group
 - Manhattan - Providing international investigations for the financial community. - Alice Byrne Investigations, Inc.
- Manhattan - Handles a range of civil and criminal cases worldwide, including corporate, custody, malpractice and missing persons.
- Business Integrity International
- Manhattan - Offers investigations, security services, and competitive intelligence.
- Gambino Information Services, Inc.
- Howard Beach - Offers background, insurance, property, missing person, and other services.
- Holmes Detective Bureau Inc.
- Manhattan - Providing security services, debugging, executive protection, pre-employment screening, and more.
- ICORP Investigations
- Manhattan - ICORP Investigations provides a wide range of services including insurance investigations, background checks, child custody investigations, locating or find people, infidelity, and more.
- Interfor Inc.
- Manhattan - International firm specialising in comprehensive corporate and financial investigations for legal, corporate, financial communities, and individuals.
- JL & Associates
- Manhattan - Private investigators offering corporate, civil, criminal, and domestic investigative services.
- Kessler International
- Manhattan - International corporate investigations, forensic accounting, brand protection and computer forensics.
- Mundi
- Manhattan - Providing business and marketplace intelligence and security.
- North American Investigations
- A leading New York private investigation firm. Offers complete investigation services including matrimonial, infidelity, surveillance, child custody, cheating spouse, missing persons, and more.
- O'Brien Investigations
- Manhattan - Based in New York City.
- Sherlock Investigations
- Manhattan - Investigative services include people locating, background checks, and wiretap and bug detection.
- Solo Credit International Corp.
- Manhattan - Full credit reporting service.
- Sontag Associates
- Manhattan - Services include surveillance, missing persons investigation, and background checks.
- Subtle Investigations
- Manhattan - Investigative consulting firm specialising in corporate fraud and business protection.
- TenanTracers, LLC
- Private investigative agency that specialises in non-primary residence and unauthorized sublet cases in New York City.
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