This is a seat for five. The stock seat refers to the trading seat opened in the stock exchange (or futures exchange), which is the place where members of the stock exchange (or futures exchange) trade stocks. Five-selling seats refer to trading seats whose main operation is to sell stocks in the five-file market of stocks. Simply put, it is trading at the highest selling price of the stock, which is the most favorable position for the seller and the relatively unfavorable position for the buyer.