The COVID 19 emergency has led to an increase in corruption related to the need to invest significant resources and to a simplification of procedures and reduction of controls in the public sector. At a time when institutions are focused on containing the epidemiological risk and the pandemic economic consequences, the management of the corruption risk is above all left to private companies, assisted by that system of crime prevention under Legislative Decree no. 231/2001. The organization models, the procedures and the ethical principles represent the tool through which the culture of legality, transparency and control can guide the action of companies, together with the role of the Supervisory Body and the so-called whistlebowers . So the intervention will be aimed to outline the renewed importance of the prevention of corruption in the private sector during the emergency through the 231 models and the possibility of making them mandatory for the sectors most at risk.