Core Viewpoint - Billionaire hedge fund manager Bill Ackman is proposing a new plan for Fannie Mae and Freddie Mac aimed at optimizing taxpayer value and minimizing mortgage spread risks [1][3]. Group 1: Proposal Details - Ackman will present his plan during a livestream event on November 18, which he believes will benefit the Trump administration and taxpayers [1]. - The proposal could potentially allow the U.S. Treasury to show a mark-to-market value for its shareholdings in Fannie Mae and Freddie Mac [1]. - Ackman’s company, Pershing Square, is the largest common shareholder of both firms, holding over 210 million shares combined [2]. Group 2: Previous Suggestions - Earlier in the year, Ackman suggested merging Fannie Mae and Freddie Mac into a single entity to reduce costs and lower mortgage rates, which he believes would simplify the housing-finance system and unlock shareholder value [2][4]. - The new proposal aligns with the Trump administration's investigation into making housing more affordable, including the consideration of a 50-year mortgage [3][4]. Group 3: Market Impact - Ackman's proposal has the potential to reshape the housing market and the operations of Fannie Mae and Freddie Mac, impacting various stakeholders involved [3][4].