Standard & Poor’s led the rating agencies in subprime business during the first nine months of the year, a new Inside B&C Lending analysis reveals. But the rating agency has seen competitors chip away at its lead. According to data compiled by Inside B&C Lending, S&P rated $355.32 billion in securities backed by subprime loans through the end of September, a figure equal to 96 percent of the period’s total $370.02 billion in issuance. … [One data table included]