Social Finance, a nonbank that started offering mortgages in 2014, is preparing to issue a $168.79 million jumbo mortgage-backed security, according to presale reports. It will be the first jumbo MBS from SoFi, which originated all of the mortgages backing the deal. While SoFi started operations in 2011 as a peer-to-peer or marketplace lender, Fitch Ratings noted that its funding strategy has evolved to more traditional sources, such as banks and other large financial institutions ...