Abstract: Following a worldwide tendency to disclose public information, in May of 2012 the new Brazilian transparency law, Lei de acesso `a informac ̃ao came into force, making public information available for all citizens. Using a rich dataset containing worker and employer information from both the private and public sector, this paper implements a difference in differences approach to measure how this information shock had an impact on the gender wage gap. Main results show that the law had null or negative effects on men’s remunerations, while women experienced gains of 2.8 to 3.7 percentage points. The estimations are mainly driven by workers who stay in the public sector throughout the entire sample period and change entities within the sector, providing further supporting evidence of reallocation of workers between and within sectors.