By default, the Option Chain is set to display three strike prices above and below the at-the-money (ATM) strike price. ATM is the strike price that is closest to the current price of the underlying stock.
You can use the Display drop-downs to modify the way you see information in your Option Chain window.
Number of Strike Prices: The number of strike prices displayed can be changed between one, three, five, and 10, or all available.
Strike Prices: Choose to see at-the-money, below-the-money or above-the money strike prices based on your trading objectives.