The executive order seeks to limit institutional investors from purchasing single-family homes, but some market participants believe it would do little to boost housing affordability nationally.

Mortgages tied to Ginnie Mae accounted for 18.3% of total servicing outstanding at the end of September. Some servicing share shifted away from the GSEs, though Fannie and Freddie still dominate. (Includes two data tables.)

While government-insured mortgages are assumable, few assumptions are completed due to various obstacles. GSE mortgages were also assumable until the 1980s, when legal issues prompted a change.