The number of active issuers of jumbo non-agency MBS effectively doubled this week as presale reports were released on pending deals from JPMorgan Chase and EverBank Financial, bringing more depth and diversification to a market that has slowly regained its footing over the past year.Chase is offering a $616.26 million non-agency jumbo MBS and provided 48.1 percent of the loans to be included in the security. The deal is set to receive AAA ratings from DBRS, Fitch Ratings and Kroll Bond Rating Agency with a 7.40 percent credit enhancement on the top-rated tranche.