Bill Ackman is returning to the IPO market with a plan to raise up to $7 billion through a closed-end fund called Pershing Square USA, which would also give investors stakes in Pershing Square Inc., his alternative asset management firm, according to filings with the SEC. Bailey Lipschultz has more on "Bloomberg Open Interest." -------- More on Bloomberg Television and Markets Like this video? Subscribe and turn on notifications so you don't miss any videos from Bloomberg Markets & Finance: