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What is an option chain and how to read it
An option chain is the live table of all available call and put contracts for a stock or index, showing every strike price, its premium, open interest, and volume. Learning to read it is the foundation of options trading in India.
In one line
An option chain is a grid that lists every available call and put contract for a stock or index across all strikes and expiries, and 3 key columns are premium, open interest and change in open interest; they show price and matched inventory, not trader identity or direction by themselves.
BazaarBaaziSource & method
How the chain is laid out
The option chain is centred on the current market price of the underlying. Strikes are listed in a vertical column in the middle. To the left are call options, to the right are put options, though different platforms flip this. Each row is one strike price. The row closest to today's market price is the at-the-money strike, strikes above it are out-of-the-money for calls (and in-the-money for puts), and strikes below it are in-the-money for calls.
The numbers you read for each strike include the last traded price (the premium), the bid and ask, the open interest, the change in open interest since yesterday, and the volume for the day. Implied volatility is also shown on many platforms. The premium is what you pay to buy the option. The open interest tells you how many contracts are still open and not yet squared off. A strike with very high open interest is one where a large number of traders have taken a position, making it a level the market watches closely.
Reading inventory without inventing direction
High call or put OI marks a large concentration of matched outstanding contracts. Traders may watch those strikes as possible reaction zones, but the chain does not identify a writer, a defended level, or a guaranteed support or resistance. Max pain is likewise a mechanical intrinsic-payout proxy, not observed trader profit.
Change in OI is the net change in matched open contracts. Even an intraday spike has no public aggressor, opening-versus-closing flag, counterparty, hedge link or covered-versus-naked label. Combine chain inventory with price, volume, spreads and volatility, and withhold direction when those separate signals do not agree.
FAQ3 reader questions · AEO-eligible
Common questions on what is an option chain.
What is the option chain in simple terms?
It is a table showing all available call and put contracts for a stock or index across every strike and expiry, with columns for premium, open interest, and volume. It is the full menu of options you can buy or sell.
How do I read the option chain for Nifty?
Find the current Nifty level and compare premium, volume, IV and matched OI around it. Treat high-OI strikes as candidate reaction zones; OI rising or falling does not by itself identify fresh sellers, covering, or a defended level.
What is in-the-money vs out-of-the-money in the option chain?
A call option is in-the-money when the strike is below the current market price, meaning it has intrinsic value. A put is in-the-money when the strike is above the market price. Strikes beyond the current price in the wrong direction are out-of-the-money and carry only time value.
Keep learning
Adjacent concepts every Indian retail investor should have straight.
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All explainers
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What is PCR
The ratio of put to call open interest, and why composition is not direction.
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Open interest
The count of live matched contracts, and what OI can and cannot reveal.
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Max pain
A mechanical minimum-payout strike derived from open interest, and its strict limits.
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What is GMP
The unofficial pre-listing price chatter, what it signals, and why it is not a guarantee.