Stocks of a corporation incorporated in the US are completely seizeable. If he won't cooperate, he could be jailed for contempt (they don't need to prove wrong

Stocks of a corporation incorporated in the US are completely seizeable. If he won't cooperate, he could be jailed for contempt (they don't need to prove wrongdoing during the deal, disobeying a court order is itself enough). They could also probably just send a court order to his stock broker.