Standard & Poor’s ranked as the most active rating service in the MBS and ABS markets at the midway point in 2010, according to a new Inside MBS & ABS analysis. S&P rated some $26.74 billion of non-agency MBS during the first six months of the year, or 83.9 percent of total issuance. That restored the company to the top of the MBS business for... [Includes two charts]