Fannie Mae this week reported that it won’t ask its regulator for permission to grow its MBS holdings for the foreseeable future, but that it has made major strides toward achieving the timely fi-nancial reporting that would free the government-sponsored enterprise of portfolio restraints. Fannie’s regulatory settlement with the Office of Federal Housing Enterprise Oversight earlier this year featured a commitment not to grow its massive MBS portfolio until the GSE gets its reporting in order...