The Pershing Square manager also holds a stake in Chipotle and used to be invested in JCPenney and Canadian Pacific Railway. Here are some of his most contentious investments.
Sen. Elizabeth Warren and six other lawmakers sent a letter to the billionaire corporate-raider turned activist arguing that he may be breaking federal conflict of interest laws.
Ackman, who skipped last year's conference, will take the stage on May 8.
Don't eat up Chipotle's stock, yet.
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