Bill Ackman postpones Pershing Square IPO after scaling back expectations Financial TimesBill Ackman’s IPO of Pershing Square closed-end fund is postponed, NYSE says CNBCBill Ackman’s own hedge fund is asking investors to ignore what he says FortuneBillionaire Bill Ackman postpones IPO for Pershing Square USA New York Post Ackman Eyes $4 Billion for Closed-End Fund, Short of Goal Bloomberg