Nonbank Mortgage Servicers: Existing Regulatory Oversight Could Be Strengthened, GAO-16-278: Published: Mar 10, 2016. Publicly Released: Apr 11, 2016: “The share of home mortgages serviced by nonbanks increased from approximately 6.8 percent in 2012 to approximately 24.2 percent in 2015 (as measured by unpaid principal balance). However, banks continued to service the remainder (about 75.8 percent). Some market participants GAO interviewed said nonbank servicers’ growth increased the capacity for servicing delinquent loans, but they also noted challenges. For example, rapid growth of some nonbank servicers did not always coincide with their use of more advanced operating systems or effective internal controls to handle their larger portfolios—an issue identified by the Consumer Financial Protection Bureau (CFPB) and others.”