S&P Tops Rating Agencies in B&C Business at 3Q Mark Standard & Poor’s led the rating agencies in subprime business through the end of September, a new Inside B&C Lending analysis reveals. Overall, S&P rated $133.37 billion in MBS deals backed by subprime loans during the period, a total equal to a staggering 96.2 percent of the total $138.64 billion in subprime issuance. The data suggest that S&P has made significant market share gains since