Option Chain

In one line: 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.

In simple words

The option chain is the master price list for options. For each strike price, it shows the call on one side and the put on the other, with their prices, open interest and volume. On the NSE option chain for Nifty or Bank Nifty, calls are usually on the left and puts on the right, with the current price in the middle. Learning to read it is the first practical skill of an options trader.

How the option chain is laid out

A standard option chain places strike prices down the centre, calls to the left and puts to the right. For each side you see the last traded price (LTP), the change in price, open interest (OI), the change in OI, the implied volatility, and the volume. In-the-money options are usually shaded. The rows near the current spot price are the most active and liquid. On the NSE, you select an underlying (e.g., Nifty) and an expiry, and the chain refreshes with live data.

What each column tells you

LTP shows the current premium. OI shows how many contracts are open at that strike — a gauge of commitment. Change in OI reveals whether positions are being built or unwound today. Implied volatility shows how expensive that strike is relative to expected movement. Volume shows today's activity. Read together, these columns let you infer where the big money is positioned, which strikes are liquid, and where the market expects support and resistance.

Reading positioning from the chain

The highest call OI strike often acts as resistance (call writers defend it as a ceiling) and the highest put OI strike often acts as support (put writers defend the floor). Together they frame the market's expected range for the expiry. Shifts in OI during the day show writers building or abandoning those levels. This is why the option chain is not just a price list but a real-time map of where traders believe the underlying is likely to stay.

Using the chain to select strikes

The chain helps you pick strikes with the right liquidity and probability. Near-the-money strikes have the tightest bid-ask spreads and highest OI — easiest to enter and exit. The premium and implied volatility columns help you judge whether an option is cheap or expensive. For spreads and multi-leg strategies, the chain lets you compare premiums across strikes at a glance to build the exact risk-reward you want.

Practical example (Nifty)

Open interest vs volume in the chain

Why it matters in practice

• The option chain is the primary dashboard for premiums, open interest, IV and volume across all strikes.
• Highest call OI marks likely resistance; highest put OI marks likely support, framing the expected range.
• Change in OI reveals whether positions are being built or unwound in real time.
• Near-the-money strikes are the most liquid — best for clean entries and exits.

Common mistakes

• Looking at a single option in isolation instead of reading the whole chain for context.
• Confusing open interest (outstanding positions) with volume (today's activity).
• Treating high-OI strikes as guaranteed levels rather than probable support and resistance.
• Trading illiquid far-OTM strikes with wide spreads shown clearly in the chain.

What professionals do

Professional index traders scan the option chain every morning: they map the highest call and put OI to frame the day's expected range, watch intraday OI shifts to see where writers are defending or capitulating, and use the IV column to judge whether premium is rich or cheap before buying or selling. They treat the chain as a live positioning map, cross-checked against price action, not as a crystal ball.

Frequently Asked Questions

Sources & references

• NSE India — Option chain

Educational content only — not investment advice.