Refers to the profit and loss of futures positions corresponding to the settlement price of the previous trading day. According to the inquiry of Visa Insurance, closing positions and marking market profits and losses refer to the behavior of investors to lock in gains or reduce losses when the price changes when trading futures contracts. Mark-to-market profit and loss is one of the concepts of futures trading settlement, and the futures settlement system is "daily debt-free settlement system", also known as "daily mark-to-market system".