Option Chain

Option Chain Explained Simply — Support, Resistance & OI

6 min read · Nifty & Bank Nifty option chain analysis

What is an option chain?

An option chain is a table that shows all available Call and Put options for a given index (like Nifty) at different strike prices. It's published live on the NSE website and updates every few minutes during market hours.

The most important column in the option chain is Open Interest (OI) — the number of outstanding contracts at each strike. This tells you where the big money is positioned.

The 3 key concepts

1. Open Interest (OI)

OI = number of active contracts at a strike. High OI means many traders have positions there. It acts like a magnet — the market tends to gravitate toward high-OI strikes, especially near expiry.

2. Call OI = Resistance

The strike with the highest Call OI is where option writers have sold the most Calls. They will defend this level aggressively. This becomes a resistance zone — the market struggles to break above it.

3. Put OI = Support

The strike with the highest Put OI is where option writers have sold the most Puts. They defend this level too. This becomes a support zone — the market tends to bounce from here.

How to find support and resistance in 2 minutes

Open NSE option chain for Nifty weekly expiry. Look at the OI column:

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Highest Call OI strike = immediate resistance. If Nifty is at 22,500 and max Call OI is at 23,000 — that's your resistance.

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Highest Put OI strike = immediate support. If max Put OI is at 22,000 — that's your support.

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When support breaks — Put writers panic and cover. This accelerates the fall. Don't fight it.

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When resistance breaks — Call writers cover. This accelerates the rally. Don't fight it.

What is max pain?

Max pain is the strike price at which the maximum number of options (both Calls and Puts) expire worthless. Option writers — who are typically institutions — profit most when the market closes at max pain on expiry day.

The market has a tendency to drift toward max pain in the last hour of expiry. It's not guaranteed, but it's a useful reference point for expiry-day trading.

PCR from the option chain

At the bottom of the NSE option chain, you'll see total Put OI and total Call OI. Divide them: PCR = Total Put OI ÷ Total Call OI. This is the same PCR shown on the Suhrid dashboard.

Common mistakes

Mistake 1: Using monthly expiry OI for intraday. Always use the nearest weekly expiry for intraday support/resistance. Monthly OI is too far out to be relevant for same-day trades.

Mistake 2: Ignoring OI changes. A strike with high OI that's being rapidly unwound is losing its significance. Watch the "Change in OI" column, not just OI.

Mistake 3: Treating OI levels as exact prices. OI-based support/resistance is a zone, not a precise number. Give it a 50–100 point buffer on Nifty.

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Disclaimer: For educational purposes only. Not financial advice.

Frequently asked questions

How do I find support and resistance using option chain?

Open NSE option chain for the nearest weekly expiry. Find the strike with the highest Call OI — that is your resistance. Find the strike with the highest Put OI — that is your support. These levels are most reliable between 10 AM and 2 PM on non-expiry days.

What is OI buildup in options?

OI buildup means new positions are being added at a strike. If Call OI is building at 23,000 while Nifty is at 22,800, it signals strong resistance at 23,000. If Put OI is building at 22,500, it signals strong support there.

What happens when max pain and current price are far apart?

When the current Nifty price is far from max pain, there is a tendency for the market to drift toward max pain as expiry approaches — especially in the last 1–2 hours of Thursday trading. This is not guaranteed but is a useful reference for expiry-day strategies.

Which expiry should I use for option chain analysis?

Always use the nearest weekly expiry for intraday and short-term analysis. Monthly expiry OI is relevant for swing trades and positional strategies. Never mix the two — they have different OI concentrations and different support/resistance levels.