Observers of the subprime auto ABS market are raising concerns as delinquencies rise above peaks seen during the financial crisis as lenders have loosened underwriting standards in search of market share. According to Fitch Ratings’ index of subprime auto ABS, 60+ day delinquencies on loans backing the securities hit 5.45 percent at the end of 2016. Delinquencies were up from 4.70 percent at the end of 2015 and 41 basis points higher than the peak for the sector in 2009. The index tracks an outstanding balance of $38.6 billion from 149 transactions. There were 21 active shelves in the index, up from 12 active issuers in 2010. “Smaller lenders along with recent new entrants are...