In the summer of 2015, EY and IEER conducted their fifth joint research on integrity and corruption at the Hungarian companies. The focus of the research was to investigate corporate measures against corrupt behavior and misuse of information or position, the penetration of corruption, and to have Hungarian corporate leaders’ opinion on corruption and their expected behavior about the subject. Our interviewers conducted personal interviews with owners and top management members of companies employing at least 50 people. The survey is based upon 305 interviews and can be considered representative concerning employment and ratio in the economic sectors. The research analyses the rule of law and the regulatory environment including the relationship with the government, the role of personal connections with state officials and the opinion of the managers on the recent governmental measures against corruption. In the second part of the paper we investigate the corporate governance and corporate rules against fraud and corruption such as ethical codes, ethics hotline, and handling of ethical misconduct. In the third part corruption risks are investigated considering corporate leaders’ perception of corruption and, with an experimental approach, their answers for hypothetical situations involving corruption are studied. Finally the research also examines the measures of risk management and the data security applied by companies.