Countrywide Financial – the top mortgage originator in the primary market – also was the most active issuer of MBS for all of 2005, according to a new Inside MBS & ABS ranking. The California-based mortgage banking operation issued a total of $345.11 billion of MBS over the course of 2005, which amounted to a huge 16.1 percent of total issuance for the year. About half –48.9 percent – of Countrywide’s MBS production was… [One data table included]