Securitization of home mortgages greater than the Fannie/Freddie conforming loan limit rose substantially in 2003, but not nearly as fast as other components of the MBS market, a new Inside MBS & ABS analysis reveals. An estimated $266.3 billion of so-called jumbo mortgages were securitized through a variety of non-agency MBS programs last year, up 26 percent from the $210.8 billion that