JPMorgan Chase and Credit Suisse are coming to market with separate jumbo mortgage-backed securities that have some sharp differences in terms of collateral. The $379.78 million JPMorgan Mortgage Trust 2015-3 includes some unique characteristics such as a handful of loans with combined loan-to-value ratios above 80.0 percent and some interest-only mortgages. While the average combined LTV ratio for mortgages to be included in the deal is 69.9 percent, 15 mortgages ...