A holder who plans to exercise a cash-settled index option that settles based on closing prices can mini- mize this risk by withholding exercise instructions until just before the daily exercise cut-off time fixed by his brokerage firm. However, he may not be able to elimi- nate it entirely. Daily exercise cut-off times for index options may be earlier than those fixed for other types of options and may occur before definitive exercise settlement values have been determined. In the case of the exercise of a cash-settled index option that set- tles based on opening prices of the constituent securi- ties, this risk applies if the holder submits exercise instructions before the definitive exercise settlement index value has been announced, which may be differ- ent from index levels that are initially disseminated at the time of the opening and which may not be available in some cases until several hours after the opening. 7. Cash-settled index options whose exercise settle- ment values are based on the opening prices of the constituent securities are not traded on the last sched- uled trading day for those securities prior to the option expiration date. An option holder will be able to realize value from his option on that day only if the option is in the money and he exercises it. A vdriter of this type of option who has not previously closed out his position will be unable to do so on that last trading day for the constituent securities and will be at risk of being as- signed an exercise. 8. Current index levels will ordinarily continue to be reported even when trading is delayed or interrupted in some or all of the constituent securities of the index or when the reporting of transactions in those securities has been delayed. In that event, the reported index levels will be based on the most recent reported prices of the constituent securities—whether or not those se- curities are being currently traded. As a result, re- ported index levels