This report by Principles for Responsible Investment (PRI) recommends a few key steps for investors trying to engage with companies on whistleblower policies. First among them is defining expectations for the whistleblowing mechanisms that should be in place. In addition, they need to pinpoint the red flags likely to indicate a potential problem. Also, important is a defined escalation strategy, such as a requirement stating that investors should vote against the relevant board director if a company fails to make progress on a publicly available whistleblowing policy within one year.