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Could X go bankrupt under Elon Musk?
(www.bbc.com)
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Eh... They would have lost money as he bought Twitter for more than it was worth and once he bought it the edge funds were forced to close their positions as Twitter wasn't on the market anymore.
Unless you're talking about shorting Tesla in which case sure, but that's Elon's piggy bank, so that wouldn't make much sense.