Fitch Ratings was the most active rating service in the non-agency MBS market through the first nine months of 2009 – a potentially ominous sign since the company has put a freeze on rating a major component of the market: Alt A MBS re-securitizations. Fitch rated 82.0 percent of the non-agency MBS that were issued with ratings during the first three quarters of the year, far above the company’s...