On January 20, 2007, the Transparenzrichtlinie-Umsetzungsgesetz (Transparency Directive Implementation Act or TUG) came into effect implementing the European Transparency Directive. It entails some significant changes to the disclosure requirements of German listed corporations, such as a newly introduced Bilanzeid (confirmation of the balance sheet). In addition, material alterations to the share ownership notification rules in the Wertpapierhandelsgesetz (German Securities Trading Act or WpHG) have been made. The latter changes should be carefully observed by investors and are analyzed in this article.