PennyMac Mortgage Investment Trust plans to issue its first non-agency jumbo mortgage-backed security in the third quarter of 2013 by combining $393.0 million of non-agency jumbos it recently acquired in a bulk transaction with mortgages from its correspondent lenders. The real estate investment trust said it acquired $107.0 million in non-agency jumbos via its conduit in the second quarter, along with $8.0 million in the first three months of 2013. “Jumbo originations have been affected by the ...