In the stock market, if the price of a stock moves outside of a range of prices it has recently traded in for more than 15 seconds, the stock is briefly halted to give traders a chance to figure out if the move was justified, or if it might have been in error. There are currently 12 options markets in the United States, run by Nasdaq OMX Group, BATS Global Markets, Deutsche Boerse’s ISE unit, TMX Group’s BOX Options Exchange, Miami International Holdings Inc and Intercontinental Exchange Inc’s NYSE unit.