A record share of home mortgages originated in the first three months of 2006 were packaged in mortgage-backed securities, according to a new analysis by Inside MBS & ABS. The first quarter’s 74.2 percent securitization rate for the mortgage market represents the highest level ever recorded in the market, and a sizable increase from the 67.5 percent rate set for all of last year. Securitization rates were up in all the major categories of the… [One data table included]