Billionaire investor Bill Ackman took a 'pretty large stake' in a mystery company during the market meltdown, then sold it weeks later

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· *Hedge-fund billionaire Bill Ackman bought into a mystery business during the coronavirus sell-off, but sold weeks later and invested in established holdings instead.*
· *"We did take an, actually, pretty large stake in a company in the middle of the crisis at prices that looked very, very attractive," the Pershing...