As the title indicates, the present master thesis deals with corporate social responsibility (CSR) and shareholder structure. Particularly it focuses on the influence the shareholders have on CSR efforts of a company, as well if and how CSR strategies, efforts and activities of companies influence and alter a corporations shareholder structure. The following empirical study shows the interdependencies of shareholders and CSR with a focus on the countries of Austria and Italy. Results show that in the examined countries shareholder structure has changed in recent years due to CSR and sustainability strategies of the respective firms. In addition to the finding of existing influence of CSR on a firms shareholder structure. A further finding suggests the importance of the communication between firms and shareholders.