Kreller Companies is an American corporate investigations and risk management firm based in Cincinnati, Ohio. Since its founding in the late 1980s, it has advised clients on their use of third-party business information vendors. Today the firm offers a range of business intelligence services, including custom due diligence and investigations. The firm operates globally across a number of industries, including health care, telecommunications, defense, energy, manufacturing, and finance. Clients include companies, academic institutions, and government agencies.