- Accetta Group
 - Providing international investigations for the financial community. - Alice Byrne Investigations, Inc.
- Handles a range of civil and criminal cases worldwide, including corporate, custody, malpractice and missing persons.
- Business Integrity International
- Offers investigations, security services, and competitive intelligence.
- Holmes Detective Bureau Inc.
- Providing security services, debugging, executive protection, pre-employment screening, and more.
- Interfor Inc.
- International firm specialising in comprehensive corporate and financial investigations for legal, corporate, financial communities, and individuals.
- JL & Associates
- Private investigators offering corporate, civil, criminal, and domestic investigative services.
- Kessler International
- International corporate investigations, forensic accounting, brand protection and computer forensics.
- Mundi
- Providing business and marketplace intelligence and security.
- O'Brien Investigations
- Based in New York City.
- Sherlock Investigations
- Investigative services include people locating, background checks, and wiretap and bug detection.
- Solo Credit International Corp.
- Full credit reporting service.
- Sontag Associates
- Services include surveillance, missing persons investigation, and background checks.
- Subtle Investigations
- Investigative consulting firm specialising in corporate fraud and business protection.
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