Billionaire hedge fund manager Bill Ackman said he will unveil a new proposal next week involving Fannie Mae and Freddie Mac, the mortgage -finance giants that have been under federal conservatorship since the 2008 financial crisis.

Ackman said in a post on X that his plan would allow the Trump administration "to achieve all of its objectives of maximizing value for taxpayers, eliminating the risk of mortgage spreads widening, and enabling the U.S. Treasury to demonstrate a mark-to-market value for its shareholdings in the two companies."

Ackman said the livestream, scheduled for Tuesday, Nov. 18 at 10:30 a.m. ET, will outline the proposal in detail. He added that the transaction could be completed before year-end, "meeting the expectations of all stakeholders."

He also aimed to c

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