Investors can be classified according to their investment style. One well-known example is Warren Buffet who is known as value investor. This thesis establishes a connection between investment style ownership and corporate performance for German listed companies. The rationale for this, are differences in monitoring behaviors according to investment style. Findings include the existence of a link between owners with different investment styles and corporate performance, as well as better performance of firms with many Financial, Government, Individual, Management and Non-Financial owners. In summary, this thesis suggests that style investors in Germany govern differently. The findings are based on a data panel of 576 German CDAX companies. In addition, this thesis describes the particularities of German ownership structures and the German corporate governance system.