In options trading, you only need to pay a margin if you choose the option of selling to open a position. To open a sell position, you are the seller of the option, so you need to pay a certain margin, mainly to ensure that when the buyer initiates exercise, , the seller can perform the contract.

So when investors sell to open a position to obtain the premium, they need to freeze part of the funds

As the "opening margin", the quantity that can be sold will also be limited by this. During the holding period, the margin required for the obligation position will change in real time with the market situation, and a portion of the funds will be recalculated and frozen at the end of each day as the "maintenance margin."

Option contract margin calculation formula

Margin of the obligated party of call option = [premium settlement price + Max (12% × closing price of the underlying contract - call option out-of-value, 7% × contract Underlying closing price)] × (1 + company adjustment factor)

Put option obligated party's margin = Min [premium settlement price + Max (12%) × contract underlying closing price - put option out-of-value, 7% p>Put option out-of-the-money value = max (closing price of contract underlying - exercise price, 0)