RE:Question about last minute of tradingAn at-the-close order specifies that a trade is to be executed at the close of the market, or as near to the close time as possible. An at-the-close order is one in which the broker and/or exchange is directed to ensure that an order is only filled at that given time of the trading day. https://www.investopedia.com/terms/a/at-the-close-order.asp#:~:text=An%20at%2Dthe%2Dclose%20order%20specifies%20that%20a%20trade%20is,time%20of%20the%20trading%20day.