In my research project, I aim to methodically examine European and American regulation of continuous disclosure by stock market companies. The regulation of disclosure by stock market companies is a topic that often undergoes changes in response to events in the world, and the recent global financial crisis has led to new disclosure rules in both the EU and the US. First, I will study disclosure from a policy perspective and try to answer questions such as how much information we should require firms to disclose and how we balance such requirements with firms' need for confidentiality, to what extent a voluntary disclosure regime could be effective, how disclosure contributes to the efficiency of financial markets and to what extent disclosure requirements can be allowed to vary across firms. Subsequently, I will identify the current law on continuous disclosure by listed companies at EU level, in selected European jurisdictions, and in the US, in order to analyze the impact of these rules. In doing so, I will examine how different motivations for regulation have affected the practical application of the law, the evidentiary and other criteria for liability, the penalties for inaccurate, misleading or late disclosure, and the extent to which regulatory and administrative oversight complements civil law approaches.