American International Group’s jumbo conduit has purchased a significant volume of mortgages in the past year and has plans to issue non-agency mortgage-backed securities. As of April, AIG Investments had purchased prime jumbo mortgages with an original balance of approximately $4.80 billion, according to Fitch Ratings. AIG launched its residential mortgage lending division in 2013 and has ramped up acquisition activity since then. Fitch recently assessed...