The new non-agency jumbo mortgage-backed security from JPMorgan Chase has been described as both encouraging and puzzling by non-agency participants. The $442.54 million non-agency MBS shows that Chase thinks the non-agency securities market – largely the domain of nonbanks since 2010 – is strong enough for the bank to issue its second jumbo security this year. Non-agency MBS participants have welcomed the competition, noting that activity from a big bank such as Chase could prompt greater ...