A banner year on the origination front helped subprime servicers grow their portfolios during the first nine months of 2004. But a new Inside B&C Lending analysis suggests that more and more loans are winding up at fewer and fewer companies. Overall, Inside B&C Lending estimates that the total volume of subprime loans outstanding grew 26.9 percent, to $887.5 billion, between the end of 2003 and the end of September. On a quarterly basis, the…