A list of all the option contracts available for a stock, organized by expiration date and strike price.
What this screen is
The Option Chain (Option Chain) is the table of every available contract on one asset: rows of strike prices and columns for calls and puts. Each cell carries bid and ask, volume, open interest, implied volatility and the Greeks. It is the screen where everything in this glossary meets.
How to read it quickly
A first look checks three things: where price sits relative to the strikes (the money zone), where liquidity piles up (volume, open interest and tight spreads), and how implied volatility steps across strikes and expirations. These three decide where you can trade at all, before any directional view.
The chain as a positioning map
The total of open interest across strikes shows where the market built its positions. The big pile-ups become walls (the call wall and the put wall), and from their distribution we derive the gamma map, its flip point and Max Pain. Every structural reading tool starts from this table.
Hypothetical example
A stock at $150: spreads are tight and volume is heavy between $140 and $160, then spreads widen and volume dries up away from the money. Trading outside the liquid range pays an instant execution tax before the stock has moved at all.
Common mistake
Picking a contract by its last displayed price instead of the live bid and ask. The last price can be a trade hours old, and the live spread is the real cost.
How to read it in thirty seconds
Three columns come before the rest: Open Interest (where positions actually pile up), Volume (what moved today) and the spread (the cost of getting in and out). Implied volatility comes fourth, to judge whether a contract is expensive. Everything else is detail you read when building a specific structure.
Where to see it on the platform
The Options page shows the chain with all its columns for every covered symbol, and the Gamma dashboard turns its numbers into a visual map of walls and positioning.
The Options Chain lays out the four columns in order, and the Gamma dashboard translates the pile-up of contracts into walls.
