Simpson Thacher & Bartlett represents individuals and business entities in a wide-range of civil and criminal government investigations and proceedings. These include Federal and State grand jury proceedings, SEC Enforcement proceedings and Department of Justice and Federal Trade Commission Antitrust investigations.

The Firm also frequently assists companies and special committees in conducting internal investigations of alleged or suspected criminal conduct and has dealt with various state, federal and foreign government agencies in connection with those investigations.

The matters addressed in these investigations and proceedings include every type of business-related criminal issues, including antitrust, state and federal securities laws, Foreign Corrupt Practices Act, bank fraud, tax evasion and regulatory matters. In connection with such matters, the firm has negotiated with state, federal and foreign prosecutors, defended clients in civil and criminal actions, and represented clients in connection with state and federal grand jury proceedings and regulatory investigations and proceedings before congressional committees.