Powered by a surprisingly brisk origination market, volume in the subprime MBS sector grew to new heights last year. According to a new analysis and ranking by Inside B&C Lending, a record $507.65 billion in new subprime loans were securitized last year. That marked a solid 26.4 percent upswing from 2004’s $401.47 billion level. Volume was helped by a surge of issuance in the third quarter, when $137.45 billion in subprime loans were securitized… [One data table included]