Delinquencies on non-qualified mortgages have been minimal and many borrowers with the loans seek to refinance relatively quickly, according to an analysis by Wells Fargo Securities. Among non-QMs with at least two years of seasoning that were included in nonprime mortgage-backed securities, more than 97 percent haven’t missed a payment, according to Wells. “Borrower credit performance has been robust so far, with delinquency rates and losses still subdued,” the analysts said. As of the end of July, only one non-QM in a nonprime MBS has gone...