Five Oaks Investment this week issued its first jumbo mortgage-backed security, although the real estate investment trust has contributed to jumbo MBS issued by others. The $267.19 million Oaks Mortgage Trust Series 2015-1 received largely favorable reviews from the rating services, though Five Oaks’ lack of a track record in the jumbo MBS market helped prompt credit enhancement of 8.45 percent on the senior tranche. Both Fitch Ratings and Moody’s Investors Service said they found that ...