The first jumbo mortgage-backed security from a subsidiary of Hatteras Financial received relatively strong reviews from rating services. The $231.18 million Onslow Bay Mortgage Loan Trust 2015-1 received AAA ratings with credit enhancement of 8.55 percent on the senior tranche. DBRS and Standard & Poor’s said that while they find Onslow Bay to be an acceptable aggregator, they increased the required credit enhancement on the MBS somewhat due to Hatteras’ lack of experience ...