In this paper, we shed light on the relative contribution of the separation and job finding rates to French unemployment at business cycle frequencies by using administrative data on registered unemployment and labor force surveys. We first investigate the fluctuations in steady state unemployment, and then in current unemployment in order to take into account the unemployment deviations from equilibrium. Both data sets lead to quite similar results. Both rates contributed to unemployment fluctuations during the nineties (50:50 split), while in the last decade the job finding rate was more significant and explained around 65% of the French unemployment fluctuations. In particular, the last business cycle episode, including the last recessio...