A fundamental pillar of the European Commission’s Strategy for Financing the Transition to a Sustainable Economy, harmonized sustainability reporting is functional to giving substance to a company’s sustainability endeavors, to identifying a shared classification system for sustainable activities, to tackling greenwashing, and to helping institutional investors meet the disclosure obligations they, in turn, are imposed on by the SFDR. While institutional investors remain the main users of corporate sustainability disclosures, yet sustainability reporting facilitates interaction between investors and other stakeholders, such as NGOs, as a lever by which to enhance stakeholders’ voice and overcome the limited ability of broadly diversified institutions, especially passive fund managers, to actively monitor portfolio firms and reduce systematic portfolio risk. In order for EU sustainability reporting to deliver on its promises, two factors are crucial. First, the current fragmentation of non-financial reporting standards based on different frameworks and, particularly, on diverging notions of materiality, should be overcome. Second, an adequate balance between the narrative and quantitative dimensions of sustainability reporting should be struck in order not only to make sustainability disclosures meaningful for its users, but also to allow for mutually connecting, and achieving coordination between, financial and non-financial information.