How do we value your options positions?

The value and profit or loss (P/L) of your options positions are all calculated based on the mark price. The mark price is a reference price used to determine the fair value of an option.

There are two ways to find the mark price of an option:

Go to the option's quotes page.
Check the options chain.

Mark price calculation by options type:

Options Type	Mark Price Calculation
US stock options and index options	Mark Price = (Best Bid + Best Ask) / 2
Futures options	Mark Price = Last Price, unless: • If Best Ask < Last Price, then Mark Price = Best Ask • If Best Bid > Last Price, then Mark Price = Best Bid

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How do we value your options positions?

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