Option One Leads Surging B&C Mortgage Securitization Market Through September Option One Mortgage led a surging subprime securitization market to the wire at the end of September, a new Inside MBS & ABS ranking of the top issuers reveals. The H&R Block subsidiary, which has become a frequent partner of Freddie Mac, issued a hefty $6.8 billion in new subprime securities during the first nine months of this year, a 124.6 percent increase from the