The P2P institutional fixed income funds, I work with, have AUM much higher. Also, they are not targeting double-digit returns, mostly mid to high-singles.
Orchard is very active with order management for institutional funds. But Orchard's end game is to create a secondary marketplace like FOLIOfn for institutional investors. They recently raised $12M of VC money. So, I don't expect them to be cash flow positive. There seems to be lot of activity in creating secondary marketplace for institutions as there is none right now. I am aware of at least 3 startups trying to target this segment.