FirstKey Mortgage, a jumbo conduit indirectly owned by funds managed by Cerberus Capital Management, is set to issue its first jumbo mortgage-backed security. FirstKey ramped up its jumbo activity in the past year and to this point has aggregated loans for inclusion in jumbo MBS from other issuers, including WinWater Home Mortgage, another relatively new jumbo MBS player. The $285.98 million FirstKey Mortgage Trust 2014-1 is set to receive AAA ratings ...