An option chain is a table of every listed strike price for an index or stock, showing the open interest, volume, and premium at each level. Even if you never trade options, it maps where other participants have placed money, giving a rough read on positioning, the range the market is pricing, and levels that may act as support or resistance. It describes what is being priced, not what will happen; it is information, not a signal to act.
Key takeaways
- An option chain lists every strike price with its open interest, volume, and premium for calls and puts side by side.
- Large open interest at a strike is often read as a level where many participants have positioned, which can behave like informal support or resistance.
- The spread of premiums across strikes reflects the range the market is pricing for, not a forecast the market guarantees.
- Option data describes positioning and uncertainty. It is information to interpret, never a recommendation to buy or sell.
What is an option chain actually showing?
An option chain is a table published by the exchange for a single underlying asset, such as the Nifty 50 index or a large stock on the NSE. Each row is one Strike Price, and the table lists, for both the Call Option and the Put Option at that strike, how many contracts are open, how many changed hands today, and the Premium being paid.
Because every strike is shown at once, the chain is less a single number and more a map. It shows where money is concentrated, where it is thin, and how the price of protection changes as you move above and below the current market price. Reading it requires no trading of a single Derivative, only an understanding of what each column represents.
How does open interest hint at positioning?
Open Interest is the number of contracts that are currently open and not yet closed out. When a strike carries very large open interest, it means a lot of participants have taken a position tied to that level, and both the buyers and the writers of those contracts have a stake in how the price behaves around it.
Market participants often read heavy call open interest above the current price as a zone where sellers of those calls may resist an advance, and heavy put open interest below as a zone where sellers of those puts may cushion a decline. This is why traders sometimes describe such strikes as informal Support and Resistance. It is an observation about where positioning is dense, not a guarantee that the price will stop there.
View the full option chain for index contracts on Artha Terminal, with open interest and premium laid out by strike for each expiry.
How does the chain express an expected range?
Option premiums reflect, among other things, the market's estimate of how much the underlying might move, captured in Volatility. Strikes far from the current price trade at low premiums because the market judges them unlikely to be reached, while strikes near the current price cost more.
Taken together, the pattern of premiums outlines a range the market is currently pricing as probable over the life of the contract. Participants sometimes approximate this using the premiums of the near-the-money options for a given expiry. The important word is "currently": this range is a live reflection of collective expectation and it widens or narrows as new information arrives. It is not a boundary the price is obliged to respect.
Why is this information and not a signal?
It is tempting to treat a wall of open interest or a shift in premiums as a prediction. It is not. The option chain records where participants have positioned and what they are paying for uncertainty. It does not know the future, and positioning can be unwound as quickly as it was built.
Large players also use options to hedge existing holdings rather than to bet on direction, so a heavy put position can mean protection of a long book, not a view that prices will fall. Reading the chain as information keeps you asking the right question, which is "what is being priced here and why," rather than the wrong one, which is "what is this telling me to do." Nothing in an option chain is a recommendation.
How can you read an option chain on Artha Terminal?
The value of the chain comes from seeing open interest, volume, and premiums across every strike at once, alongside the price of the underlying. Watching how those figures change through the day, and comparing today against the previous session, is where the positioning story becomes visible.
On Artha Terminal, the derivatives section presents the full option chain for index contracts with open interest and premium laid out by strike, so you can observe where positioning is concentrated without leaving the page. You can also ask the built-in assistant, Ask Warren, to explain what a particular pattern of open interest means in plain language. To understand the day-to-day shifts, pair this with Open interest and falling prices and Why max pain shifts daily.