Once a trouble bank is nationalized all shares will be liquidated. Even is you are a prefered shareholder. If a public company go bust, the prefered shareholder will still get the most of the asset left and the balance will be distributed to ordinary shareholder. So in this case, all those who invested regardless of their holding status will see their portion neutralized and may becomes nihil, zero, or Kosong. This is worst than paper lost where you can recover some if u decide to cut losses or waait for it to pick up