The purpose of this research is to find out the relationship between the frequency of interim financial reporting with information asymmetry and cost of equity for issuers in the Jakarta Islamic Index for the period 2012 to 2018. Research findings on 84 companies, namely (1) there is no relationship between the frequency of interim financial reporting with information asymmetry (2 ) there is no relationship between the frequency of interim financial reporting with the cost of equity. The absence of this relationship is caused by (1) interim financial reporting frequency data that are not different between issuers (2) research settings.