Port of Rotterdam Authority is a publicly owned but corporatized port development company. In 2004, this organisation was transformed from a municipal department to an independently operating company. The corporatisation intended to improve the overall performance of the port of Rotterdam. Relevant performance indicators to evaluate the effect of this corporatisation include market share, turnover, operating costs, profits, and investments. These indicators are evaluated for two periods, one prior to the corporatisation (1997-2003) and the other afterwards (2005-2011). The comparison of these two periods shows that corporatisation has led to significant performance improvements. This finding is relevant for the ongoing discussion on port governance models