Fannie Mae purchased $87.6 billion of mortgages from its seller/servicers in December, its best purchase month of the year and yet another sign that loan production remained strong in the fourth quarter.

Last week Freddie Mac reported that it purchased $49.7 billion of mortgages from its lending customers in December, its best purchase month of the year as well.

For the full year, Fannie acquired $855 billion of home mortgages, a 4% jump from 2009. (Freddie bought $412 billion of product, a 25% decline from 2009.)

The figures also show that when it comes to loan purchase market share, Fannie Mae was considerably bigger than its cross town competitor: 54% to just 26%, according to figures compiled by National Mortgage News (NMN).

Market share is calculated by taking a GSE's business acquisitions, and dividing it by industry-wide originations. According to NMN and the Quarterly Data Report, all lenders funded $1.58 trillion of home loans in 2010.

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