Bond rating agencies and their role in bank market discipline

This study examines whether changes in the ratings of bank debt have any information content. Bank holding companies are monitored both by bank regulators and by debt rating agencies, leading to the view that duplication of effort may render superfluous the monitoring service of rating agencies. However, our results show that downgrades of bank debt are associated with statistically significant wealth losses, irrespective of whether the rating change is across rating classes or within a rating class. Moreover, the results hold even when observations with potentially confounding events are removed from the sample. These results suggest that rating agencies provide valuable information to the capital market regarding the risk exposure of bank holding companies.