Philipp Ottenstein

• This paper-based dissertation comprises five essays dealing with corporate sustainability and digital reporting and is structured in six chapters. The first chapter is the introduction and provides an overview of the structure and aims of the dissertation, lays out the contribution of the work, and introduces the five manuscripts. The second chapter, respectively the first manuscript, deals with the consequences of mandatory sustainability reporting in Europe. Specifically, the study deals with the question whether Directive 2014/95/EU has achieved its objectives of increasing reporting quantity and quality. In the third chapter, the sustainability reports of the largest European firms are analyzed using computer-aided text analysis. This study investigates whether and how external assurance of sustainability reports is beneficial from the viewpoint of report transparency, which is proxied by reporting scope, optimism, and readability. In the fourth chapter, the role of corporate sustainability in the context of M&A transactions is examined, precisely whether sustainability influences the premia paid in M&A transactions. The fifth and the sixth chapters center around the voluntary usage of online financial reporting (OFR) in Europe. While the fifth chapter is concerned with the usage and empirical determinants of OFR, the analysis in the sixth chapter examines the impact of OFR on the financial market, specifically on analyst following and stock liquidity.