Despite the numerous reorganizations across Europe in the past years, business management research hasn't really concerned itself with organizational structures. In this study, hypotheses on current organizational structures are established and tested in an empirical filed stuy of the 300 largest companies in Germany, Austria and Switzerland. The results show that the optimal organizational form is contingent on the company size, the degree of diversification and the environmental dynamics. In general, a return simple and balanced structures, which enable the realization of horizontal synergies without reducing divisions' autonomy too severely, is perceived.