F&O: option chain

Open interest, put-call ratio, max pain and the expected move for Nifty, Bank Nifty and every F&O stock, from NSE. New to options? See “What these numbers mean” below.
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What these numbers mean
Open interest (OI)
The number of option contracts still open at a strike. Big call OI above the price often acts as a ceiling (call sellers defend it); big put OI below it often acts as a floor.
Change in OI
Contracts added (+) or closed (−) today. Fresh put writing below the price is read as support building; fresh call writing above it as resistance building.
PCR
Put-call ratio: total put OI ÷ total call OI. Above 1 means more puts are written, usually read as bullish; below 0.7 as bearish. Extreme values (above 1.5 or below 0.5) can mean the crowd is one-sided and a reversal is near.
Max pain
The expiry price at which option buyers together would lose the most (and sellers keep the most). Prices often drift towards it near expiry, but it is a tendency, not a target.
Support / resistance
The put strike at or below the price with the most OI, and the call strike at or above it with the most OI.
IV
Implied volatility: the yearly move the option price implies, in %. Higher IV means pricier options.
Expected move
The at-the-money call plus put price (the straddle). The market prices roughly this much movement, either way, by expiry.
ITM / ATM
In the money: calls below the price and puts above it (shaded). At the money: the strike nearest the price (outlined).
Data from NSE, refreshed every minute during market hours (NSE itself updates every few minutes). OI is in contracts. For information and learning only, not investment advice; options carry a high risk of loss.