The risk-sharing transactions that Fannie Mae and Freddie Mac started offering in 2013 have drawn some investors away from buying new jumbo mortgage-backed securities, according to industry participants. The government-sponsored enterprises say the deals that share credit risk with investors help reduce taxpayer risk. However, the returns and risk profile of Freddie’s Structured Agency Credit Risk deals and Fannie’s Connecticut Avenue Securities deals have caused some investors to abandon jumbo MBS and instead invest in the GSEs’ offerings. Aaron Pas, a senior vice president of non-agency portfolio management at American Capital Mortgage Investment, said...