The business of rating non-agency MBS and non-mortgage ABS changed dramatically in 2009, with Fitch Ratings emerging as the most active company in the MBS market and greater dispersion in ABS ratings than in prior years. Fitch rated 74.6 percent of the non-agency MBS issued last year, up from just 23.3 percent back in 2008. While Standard & Poor’s continued to rate... [Includes two charts]