WinWater Home Mortgage, a relatively new jumbo conduit, is preparing to issue a $249.47 million jumbo mortgage-backed security. The deal is set to receive AAA ratings from DBRS, Kroll Bond Rating Agency and Standard & Poor’s despite concerns about the lack of performance data for WinWater and the firm’s “limited financial capacity.” WinWater is partly owned by principals of Premium Point Investments, a residential mortgage investment advisor ...