3.2. Sample selection
We retrieve bank quarterly financial statements from the Federal Reserve Bank of Chicago website over the period
between 2006Q4 and 2010Q1. MBS daily/weekly returns (or monthly residual ABX index return) are cumulated over each
fiscal quarter and matched with bank quarterly financial statement data. Our initial sample contains 12,927 bank-quarter
observations for 1120 unique banks. For our feedback tests, we delete bank-quarter observations with a zero beginning
non-agency MBS balance. This sample contains 5068 bank-quarter observations for 560 unique banks. Our returns tests
use a subsample of 178 public banks.