Billionaire investor Bill Ackman's 'blank check' company is seeking to raise as much as $6.45 billion

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· *Bill Ackman's "blank check" company, called Pershing Square Tontine Holdings, is seeking to raise as much as $6.45 billion.*
· *Three billion dollars of the total will be raised from outside investors through an initial public offering, according to a regulatory filing.*
· *Funds associate with Pershing Square will...