Dealbook's Michael de la Merced just Tweeted the following after Bill Ackman's appearance on CNBC's "Squawk Box" this morning.
Yesterday at the Value Investing Congress, Ackman, the founder of Pershing Square Capital Management, acknowledged that he has a new short position in his portfolio, but he said he isn't ready to make it public.
Any guesses as to what it might be?
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