Map of Chittering on I would not be able to enter a SOES order at 50 for 1,000 shares because ISLD ECN is not SOES-eligible. With the new SuperSOES rules due out in late 2000, ECNs may participate for SOES eligibility, but currently, they are not. With ECNs, I have to accept partial fills as a part of the game. I remember getting a fill for one share of a stock on ISLD before. Although someone may ask why someone may trade one share of stock, the explanation is relatively easy. Some traders, when they are figuring out how much stock to buy, will divide the price of the stock by how much money is in their portfolio. Therefore, if a stock is trading at 9. Map of Chittering 2016.