      There are, however, some disadvantages to using SOES. The first isthat the maximum number of shares that can be executed over SOES is 1,000.Second, once you buy (or sell) on SOES you cannot buy (sell) that samestock again for five minutes. (You can exit the trade using SOES withinfive minutes, but you cannot add another trade on the same side during thisperiod.) Additionally, if you buy (or sell) on SOES, you cannot buy (sell)on SNET or any ECN for the remainder of that five-minute period. This isknown as the five-minute rule.