We use enterprise data to analyse and compare the determinants of enterprise performance in China and Russia. We find that in China, enterprise growth and efficiency is associated with rapid increases in factor inputs including management, as well as TFP, but not greatly associated with ownership or institutional factors. In contrast, sales growth in Russia is not associated with improvements in factor quantity (except for labor) or quality; TFP is not influenced by competition and privatization to outsiders does not enhance company performance relative to insider ownership. The main determinants of TFP are instead demand and institutional factors at a regional level.http://deepblue.lib.umich.edu/bitstream/2027.42/39910/3/wp525.pd