The transition economies in East Europe and the former Soviet Union had to build a banking system from scratch in difficult economic conditions where the socialist system had left them with nonperforming financial assets and low-productivity physical capital. This chapter evaluates the present reach of banking and financial reform in the transition countries stemming from this situation, focusing on the fundamental role of the financial sector to increase the efficiency of converting mobilized domestic and foreign savings into economic growth. The efficiency was estimated with a Bayesian hierarchical model using data from countries around the world from 1990 to 2021. The results show that both East Europe and the former Soviet Union significantly increased converting efficiency; however, there seems to be room to increase it to increase it even more by further advancing financial reforms. The reliability of the estimation results for the period after 2008 is questionable due to the increased geopolitical tensions in the former Soviet Union countries and the Covid-19 pandemic. It is necessary to monitor the progress of the financial reform further.