Fannie Mae and Freddie Mac have taken a big chunk of the Jumbo mortgage market away from private investors since 2008 when Congress raised the maximum GSE loan limit to $729,750, according to researchers at the Federal Housing Finance Agency.

Using 2009 Home Mortgage Disclosure Act figures, researchers concluded that the GSEs purchased 55% of what the government calls “high conforming Jumbo mortgages” (HCJMs) originated in 10 high-cost counties that were analyzed. (HCJMs have loan balances greater than $625,500 and up to $729,500.)

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