Mainly depends on what you mean by negative assets. If you mean liabilities, futures may be negative assets. When opening a position in the futures market, if you don't pay attention to risk control, you may wear out the position. Wearing a warehouse means that all the money in the account is gone, and the funds in the account become negative. If you go through the warehouse, you will be in debt. There can be no negative assets in the spot, even if it is worthless, the big deal is to lose all the money to buy the spot, and there can be no negative value of 1.