According to data compiled by Inside MBS &ABS, a record $507.65 billion in new subprime mortgages were securitized last year, a 26.4 percent jump from 2004’s $401.47 billion in volume. The volume story was helped by a surge in issuance in the fourth quarter. Some $137.44 billion in loans were securitized during the period, making the fourth-quarter the best three month period on record, just ahead of the second quarter of last year. … [Two data tables included]