Whenever a stock suspends, our corporate actions and risk departments will review it internally and confirm whether it is likely to trade again. If it isn't – or if the news surrounding the company is negative – we'll notify anyone with an open position on the stock that its margin requirement is going to be amended to 100%.
The margin requirement will remain at 100% until there is further news in the underlying market (e.g. relisting or delisting) which we will then reflect in due course.
Please note: This information is intended as a generic example, and subject to change at any point. It may not apply in every scenario.