Which private intelligence companies investigates?

Private intelligence companies that conduct investigations include firms like Stratfor, Pinkerton, and Control Risks. These companies specialize in gathering and analyzing information on various topics, including geopolitical risks, corporate security, and due diligence. They often serve businesses, government entities, and non-profits, providing insights to aid in decision-making and risk management. Their investigations can cover areas such as market research, threat assessments, and background checks.