How to Read an Option Chain Like a Pro
The option chain is the trader's cockpit. Learn to read LTP, IV, OI, change in OI and the Greeks so you can spot where the move — and the risk — really is.
Short answer: Read an option chain left-to-right as calls, strikes in the middle, puts on the right. The four columns that actually matter are LTP (price), IV (expected movement), OI (where positions sit), and change in OI (where money moved today). Together they tell you the expected range and where support and resistance are forming.
The layout
A standard chain shows calls on the left, the strike ladder down the middle, and puts on the right. The row nearest the spot price is at-the-money (ATM) — it carries the most time value and the sharpest gamma.
The columns that matter
- LTP — last traded price (the premium). Useful, but a snapshot.
- IV (implied volatility) — the market's expected movement priced into that option. Compare IV across strikes and expiries; unusually high IV often marks fear or an upcoming event.
- OI (open interest) — total open contracts at a strike. Large call OI above spot often acts as resistance; large put OI below spot often acts as support.
- Change in OI — today's build-up or unwinding. Rising OI with rising price = fresh longs; rising OI with falling price = fresh shorts. This is where you see today's positioning.
- Greeks — delta (directional exposure / rough probability of finishing ITM), theta (daily decay), vega (IV sensitivity).
A simple read
- Find the ATM strike (nearest spot).
- Scan OI to find the highest call and put walls — that's the market's implied range.
- Check change in OI to see whether those walls are being built or torn down.
- Glance at IV — is it rich (good for sellers) or cheap (good for buyers)?
In a few seconds you have an expected range, a bias, and a volatility read. Pair that with the Greeks and you're trading structure, not hope.
Common mistakes
- Treating LTP in isolation without IV context.
- Ignoring change in OI and only looking at absolute OI.
- Forgetting that OI walls shift intraday — a "support" can vanish.
FAQ
What is a good IV level? There's no universal number — compare against the instrument's own recent IV and across expiries. Relative, not absolute.
Does high OI guarantee support/resistance? No. It's a strong hint, not a rule. Walls get broken; treat OI as probability, not certainty.
Gravity Algo streams live IV, OI and Greeks across the whole chain in real time, with ATM auto-tracking. See it in the terminal → or start free →. New to the Greeks? Start with our learning hub.