Whenever SGX-ST shall determine that a person or group of persons acting in concert holds or controls, or is obligated in respect of, an aggregate position (whether long or short) in all Options of 1 or more Classes or Series dealt in on SGX-ST in excess of the applicable position limits, it may order all Trading Members carrying a position in Options of such Classes or Series for such person or persons to enter into closing transactions in respect of such outstanding positions as expeditiously as possible consistent with the maintenance of a fair and orderly market. Whenever such an order is given, no Trading Member shall accept any order to write, purchase or exercise any Option for the account of the person or persons named in the order, unless in each instance express approval therefor is given by SGX-ST, or until such order is rescinded.