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

President Donald Trump reportedly wants the U.S. to sell Fannie Mae and Freddie Mac stock in a quest to move mortgage finance firms from full federal control.

Donald Trump is reportedly planning to IPO Fannie Mae and Freddie Mac, potentially the largest IPO in history. Billionaire Investor Bill Ackman suggests merging the two mortgage giants to reduce mortgage rates and government oversight costs.