Despite the pile of literature on firm growth dynamics, studies that use large census data have been greatly rare for developing countries mainly due to a paucity of data. This study, however, relies on a deep analysis of complete microdata of Ethiopian manufacturing firms over a very long enough period (22 years). Hence, this study adds to the ongoing debates on the firm growth dynamics, since we provided appealing econometric findings mainly emanating from the inclusive methodological approach implemented and the complete long period census data used, as it helped us to provide clear and consistent evidence against Gibrat’s law. The results revealed that conditional on survival, younger and smaller firms grow faster. On the contrary, there is a pattern of negative persistence growth, where positive growth is followed by a negative growth after a year. Overall these findings show the presence of firms formed by subsistence-seeking entrepreneurs in the economy.