One of the most important concerns in privatization of governmental banks is to see whether there is any change on the performance of the privatized banks or not. The proposed study of this paper performs an empirical investigation on some privatized banks. In our study, we measure two well-known financial figures including return on assets and return on equity two years before and after privatization program. The proposed study uses non-parametric analysis to perform the investigation. The results indicate that there is a meaningful difference between the performance of these banks before and after privatization.