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The Truth About Fannie and Freddie’s Role in the Housing Crisis
...Fannie and Freddie bought 25.2% of the record $272.81 billion in subprime MBS [mortgage-backed securities] sold in the first half of 2006, according to Inside Mortgage Finance Publications, a Bethesda, MD-based publisher that covers the home loan industry.

In 2005, Fannie and Freddie purchased 35.3% of all subprime MBS, the publication estimated. The year before, the two purchased almost 44% of all subprime MBS sold....

...Contrary to Paul Krugman’s assertions, Fannie and Freddie did not “fade away” or “pull back sharply” between 2004 and 2006.

As the following chart from Roberts’ study shows, during that same time Government Sponsored Enterprises (GSEs) bought near-record numbers of mortgages, including an ever-growing number of mortgages with low down payments....

... Armed with these advantages, GSEs increased their book of business from $13 billion in 1965 to $1 trillion by 1990 and $3.4 trillion in 2003. Once the great real estate bubble had concluded by year-end 2007, Freddie and Fannie combined had purchased $4.9 trillion of mortgages, repackaging 70 percent of these into guaranteed securities for the secondary market.

This (along with Ginnie Mae) gave the GSEs roughly half of the $11 trillion mortgage market, but their share of new originations has become near dominant.

Many sources peg this at 70 percent, but an interesting take from TIME magazine business and economics columnist Justin Fox takes into account the impact of refinancing into GSE-backed loans. Juxtaposing GSE total volume ($ 539 billion) against new originations ($313 billion), GSE market share was 172 percent for the first quarter of 2008....