'Leaks' are rarely accidental - speaking in any public place, a savvy investor like Ackman knows what he says will be 'leaked' and made public knowledge - also gives it more credence, 'insider' info to act on - right.
Just saying - that was a planned 100 million share dump in about 45 minutes. Granted some of it was panic selling, but you have to dump a LOT of shares in a short time to reverse a strong trend. We all saw ARCA deliberately tanking the ask, selling shares at a nickel under the bid between 1:15 and 2:15 PM.
ALL IMHO
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