Some officials believe the offering could raise around $30 billion and value the combined firms at roughly $500 billion or more.

U.S. President Donald Trump's administration is preparing for the initial public offerings of mortgage finance giants Fannie Mae and Freddie Mac later this year, the Wall Street Journal reported on Friday.

Fannie Mae (FNMA) and Freddie Mac (FMCC) stocks jumped in Friday late morning trading after a media report that the Trump administration is planning to sell stock in the two mortgage titans, a long-awaited step that could start later this year.