How does the Amex deal with delayed openings and trading halts?
Regulatory and non-regulatory halts are treated differently. If the listing market calls a regulatory halt, the Amex will not open the affected stock until the halt is lifted. If the halt persists through the day, the Amex will cancel all on open orders in the stock and will not report an opening price for that stock on that day. If the halt is due to extraordinary market activity, the Amex will treat the halt as it would a regulatory halt for the purposes of the open. If a non-regulatory halt is called by another market, the Amex will open the stock and will report an opening price for the stock for that day.
