PennyMac Corp. wanted to test the market for non-agency jumbo mortgage-backed securities but it wasn’t generating enough collateral through its conduit program and turned to a bulk purchase to get a critical mass. The $550.46 million PMT Loan Trust 2013-J1 is set to receive AAA ratings with credit enhancement of 7.75 percent for the top-rated tranche. Some 70.7 percent of the mortgages to be included in the deal were acquired in bulk from Bank of America, which aggregated the loans from ...