EU mandatory corporate sustainability reporting—core legal framework Corporate sustainability, or performance in respect of ‘environmental social governance’ (ESG) criteria, has become increasingly important to investors, customers and employees in recent years. In response to this, there has been a rapid development of ESG criteria (also referred to as ESG metrics or factors) against which the performance of a, usually corporate, entity can be evaluated. The overarching goal of the mandatory and voluntary ESG reporting frameworks developing in the EU and globally is to collect measurable data to show whether corporate entities are truly ‘sustainable’ in respect of each ESG metric relevant to their business and to make that data as transparent as possible for investors and other stakeholders. In the EU, the primary piece of legislation governing mandatory sustainability reporting is Directive 2013/34/EU on the annual financial statements, consolidated financial statements and related reports of certain types of undertakings (the EU Accounting Directive), as amended by: • Directive 2014/95/EU (the Non-Financial Reporting Directive (NFRD)), which entered into force on 5 December 2014 and applied