The U.S. mortgage market has been very good to Anthony “the Mooch” Scaramucci.

In the past few years, the Federal Reserve’s unprecedented stimulus contributed to some of the biggest returns for money managers investing in mortgages. Then housing prices soared, lifting the most beaten-up home-loan securities. And Scaramucci’s SkyBridge Capital, which invests $6.2 billion in hedge funds, was along for the ride. Mortgage investments fueled returns of about 38 percent over the past two years, about triple the industry average.