While mortgage securitization – and the booming non-agency MBS market in particular – absorbed two-thirds of new home loan originations in 2005, portfolio lenders funded an estimated $1.03 trillion in production. According to a new analysis by Inside Mortgage Finance of MBS data and recent Federal Reserve Board figures on home mortgages, portfolio lenders originated or purchased 32.2 percent of last year’s hefty $3.12 trillion in 1-4 family originations. … [One data table included]