In a context of growing investor interest for businesses attentive to the social and environmental risks of their activities, ESG ratings have emerged with the function of identifying and selecting companies in line with new market expectations. ESG controversies, the news disseminated by the media on the environmental, social, and governance aspects of companies, could represent a measure of real value of a company in terms of sustainability, and thus more faithfully reflect a company's ESG performance. Greater transparency on the methods used by ESG Rating agencies would guarantee greater credibility for the agencies themselves, guide more conscious investor decisions, and encourage convergence towards a single shared rating.