Bill Ackman, the head of Pershing Square and the largest common shareholder of Fannie Mae and Freddie Mac, is urging President Donald Trump’s administration to hold off on ending government oversight over the cornerstones of the U.S. mortgage markets. 
“We do not believe that a sale of a piece of Fannie and Freddie to the public is either feasible or really desirable at this moment in time,” Ackman said during a presentation on X Tuesday morning. 
Ackman listed several reasons why he didn’t think an initial public offering of shares of the stock on the public market would achieve maximum value for…