Read the option chain like a professional

An option chain is a live table of every available call and put option for an underlying, listing strike prices, premiums, open interest and volume side by side — the primary dashboard traders use to read positioning and choose strikes.

The put-call ratio (PCR) compares put activity to call activity — usually by open interest — as a contrarian sentiment gauge: a very high PCR signals excessive bearishness (often bullish), and a very low PCR signals excessive bullishness (often bearish).

Open interest buildup reads price change together with open-interest change to classify market action into four signatures — long buildup, short buildup, short covering and long unwinding — revealing whether a move has fresh conviction behind it.

Short covering is a rise in price accompanied by falling open interest, caused by traders closing (buying back) their short positions — a rally driven by shorts exiting rather than fresh buying, and often sharp but potentially short-lived.

Long unwinding is a fall in price accompanied by falling open interest, caused by traders closing their long positions — a decline driven by longs booking out rather than aggressive fresh selling.

IV crush is the sharp, sudden drop in implied volatility right after a known event resolves — such as results, the Budget or RBI policy — which collapses option premiums and can cause long options to lose money even when the direction was right.

Max pain is the strike price at which the greatest number of options — calls and puts combined — would expire worthless, causing maximum loss to option buyers; some traders believe price tends to gravitate toward this level near expiry.

Support and resistance from open interest uses the strikes with the heaviest put and call OI to mark likely floors and ceilings — high put OI tends to act as support and high call OI as resistance, because writers defend those levels.