First, the reason is that part of the stock has recovered all the costs and earned them, so that the rest of the stock costs are negative, which will lead to the situation that the floating profit and loss are positive and the profit-loss ratio is negative after the stock is sold.

Second, the calculation method:

(1) Calculate the floating gain and loss. That is, the settlement institution calculates the floating profit and loss of the open positions of the members according to the settlement price of the transaction on that day, and determines the amount of the deposit payable for the open positions. The calculation method of floating profit and loss is:

Floating profit and loss = (opening price settlement price of the day) × positions× contract unit handling fee.

(2) Calculate the actual profit and loss. The profit and loss realized by liquidation is called actual profit and loss. Most contracts in futures trading are closed by liquidation. The calculation method of the actual profit and loss of bulls is:

Profit and loss = (closing price-buying price) × position × contract unit-handling fee

The calculation method of short-term profit and loss is:

Profit and loss = (selling price-closing price) × position × contract unit-handling fee