To enable rolling over and hence, allowing the clients to keep their positions open till whatever date they wish to, all open positions are marked-to market with the latest price for the instrument during the day and at the end of the day (EOD).

Service providers have two pricing-options for open positions, viz.

          Price the open position at the Mid price of the bid and offer price; or

§          If the client has bought the underlying then the bid price, or, if the client has sold the underlying then the offer price.

Most service providers use “Mid-Price” to mark open positions to the market. Using Mid-price provides some protection to the clients in the times of extreme volatile conditions or when the markets are relatively illiquid and the spread has widened abnormally.