In worst case if someone is demanding it and it went through the arbitration process (and possibly appeals) it would be the same as any other debt. If the share

In worst case if someone is demanding it and it went through the arbitration process (and possibly appeals) it would be the same as any other debt. If the shareholder is a company the debtor could initiate the bankruptcy procedures. Of course it's possible that they could end up not getting full amount (if anything) from the estate if there are more debts than what assets were worth. If they are private person they can attempt to judgement via court and let enforcement authority liquidate their assets or garnish their wages.