This OCC Mortgage Metrics Report for the fourth quarter of 2013 provides performance data on first-lien residential mortgages serviced by selected national banks and one federal savings association. The mortgages in this portfolio comprise about 49 percent of all first-lien residential mortgages outstanding in the United States-24.9 million loans totaling $4.2 trillion in unpaid principal. This report provides information on their performance through December 31, 2013.