Firms participating in the Public-Private Investment Program with a focus on non-agency mortgage-backed securities all took losses in the fourth quarter of 2011 compared with the previous quarter, according to an analysis by Inside Nonconforming Markets. The Oaktree PPIP Fund – which only invests in commercial MBS – was the only public-private investment fund to increase its net internal rate of return since inception in the fourth quarter of 2011, Treasury Department data show. The Treasury cautioned that it is ... [Includes one data chart]