Abstract: Whistleblower reward programmes, or ‘bounty regimes’, are increasingly used in the United States. The effectiveness of these programmes has been questioned, and empirical evidence on their effectiveness has been scarce likely due to their relatively recent introduction. In recent years, however, empirical and experimental evidence on their effectiveness has become more available and robust. We review the (rather encouraging) evidence on whistleblower reward programmes, in terms of amount of additional information generated, deterrence effects, and administration costs, and consider the possibility of extending them to accomplice witnesses in antitrust cases.