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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 strike prices and expiry dates, and the 3 most watched columns are the premium (price of the option), open interest (number of live contracts), and the change in open interest, which together show where traders are positioned.
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 the chain for direction clues
Traders use the option chain to gauge where the big money is positioned. The strike with the highest call open interest is often treated as a resistance zone for the underlying, because call writers have an incentive to keep price below it. The strike with the highest put open interest is treated as a support zone, because put writers want price to stay above it. This is the logic behind max pain and it is why the option chain is read alongside the price chart rather than in isolation.
Change in open interest through the day is as important as the absolute number. A sudden spike in call open interest at a particular strike means fresh sellers (or buyers) are entering at that level, and it shifts the market's view of where sellers are set up. Combining the chain with a reading of the put-call ratio (PCR) gives a fuller picture: which side is more crowded, and what that crowding means for the near-term direction. The chain is a snapshot of the collective bet book, and reading it is a skill that compounds with practice.
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, look at the strikes around it. The strikes with the highest call OI and put OI mark the zones sellers are defending. Check whether OI is rising or falling at each strike to see fresh positioning versus covering.
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.
Hub
All explainers
F&O
What is PCR
The ratio of put to call open interest, what a high or low reading signals, and the contrarian twist.
F&O
Open interest
The count of live contracts, and what rising or falling OI tells you when paired with price.
F&O
Max pain
The strike where option buyers hurt most, why expiries drift toward it, and its real limits.
IPO
What is GMP
The unofficial pre-listing price chatter, what it signals, and why it is not a guarantee.