Freddie Mac is set to sell a first-loss tranche on a Structured Agency Credit Risk transaction for the first time. The deal priced this week and the $880 million STACR 2015-DN1 is scheduled to settle next week. On previous STACR deals, Freddie has retained a tranche equaling at least the first 30 basis points of loss. Investor demand for the government-sponsored enterprises’ risk-sharing transactions has been strong but some have called for the GSEs to offer first-loss tranches, which can offer higher yields than the tranches that are more buffered from losses. Freddie said...