This document provides a monthly summary of Freddie Mac's mortgage portfolio for December 2008. Some key highlights include: - The total mortgage portfolio increased 4.1% in December to $2.207 trillion, with an annualized growth rate of 5.0% year-to-date. - The mortgage-related investments portfolio declined 0.1% to $804.8 billion in December. - Total guaranteed PCs and structured securities issued increased 4.1% in December. - The single-family delinquency rate was 172 basis points in December, up from 152 basis points in November.